3501 lines
118 KiB
Python
3501 lines
118 KiB
Python
r"""
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:mod:`~matplotlib.mathtext` is a module for parsing a subset of the
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TeX math syntax and drawing them to a matplotlib backend.
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For a tutorial of its usage see :doc:`/tutorials/text/mathtext`. This
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document is primarily concerned with implementation details.
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The module uses pyparsing_ to parse the TeX expression.
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.. _pyparsing: http://pyparsing.wikispaces.com/
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The Bakoma distribution of the TeX Computer Modern fonts, and STIX
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fonts are supported. There is experimental support for using
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arbitrary fonts, but results may vary without proper tweaking and
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metrics for those fonts.
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"""
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from collections import namedtuple
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import functools
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from io import StringIO
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import logging
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import os
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import types
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import unicodedata
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import numpy as np
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from pyparsing import (
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Combine, Empty, FollowedBy, Forward, Group, Literal, oneOf, OneOrMore,
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Optional, ParseBaseException, ParseFatalException, ParserElement,
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QuotedString, Regex, StringEnd, Suppress, ZeroOrMore)
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from matplotlib import cbook, colors as mcolors, rcParams
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from matplotlib.afm import AFM
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from matplotlib.cbook import get_realpath_and_stat
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from matplotlib.ft2font import FT2Image, KERNING_DEFAULT, LOAD_NO_HINTING
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from matplotlib.font_manager import findfont, FontProperties, get_font
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from matplotlib._mathtext_data import (latex_to_bakoma, latex_to_standard,
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tex2uni, latex_to_cmex,
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stix_virtual_fonts)
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ParserElement.enablePackrat()
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_log = logging.getLogger(__name__)
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##############################################################################
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# FONTS
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def get_unicode_index(symbol, math=True):
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r"""
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Return the integer index (from the Unicode table) of *symbol*.
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Parameters
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----------
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symbol : str
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A single unicode character, a TeX command (e.g. r'\pi') or a Type1
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symbol name (e.g. 'phi').
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math : bool, default is True
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If False, always treat as a single unicode character.
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"""
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# for a non-math symbol, simply return its unicode index
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if not math:
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return ord(symbol)
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# From UTF #25: U+2212 minus sign is the preferred
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# representation of the unary and binary minus sign rather than
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# the ASCII-derived U+002D hyphen-minus, because minus sign is
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# unambiguous and because it is rendered with a more desirable
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# length, usually longer than a hyphen.
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if symbol == '-':
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return 0x2212
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try: # This will succeed if symbol is a single unicode char
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return ord(symbol)
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except TypeError:
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pass
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try: # Is symbol a TeX symbol (i.e. \alpha)
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return tex2uni[symbol.strip("\\")]
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except KeyError:
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raise ValueError(
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"'{}' is not a valid Unicode character or TeX/Type1 symbol"
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.format(symbol))
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class MathtextBackend:
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"""
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The base class for the mathtext backend-specific code. The
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purpose of :class:`MathtextBackend` subclasses is to interface
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between mathtext and a specific matplotlib graphics backend.
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Subclasses need to override the following:
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- :meth:`render_glyph`
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- :meth:`render_rect_filled`
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- :meth:`get_results`
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And optionally, if you need to use a FreeType hinting style:
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- :meth:`get_hinting_type`
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"""
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def __init__(self):
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self.width = 0
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self.height = 0
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self.depth = 0
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def set_canvas_size(self, w, h, d):
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'Dimension the drawing canvas'
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self.width = w
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self.height = h
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self.depth = d
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def render_glyph(self, ox, oy, info):
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"""
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Draw a glyph described by *info* to the reference point (*ox*,
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*oy*).
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"""
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raise NotImplementedError()
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def render_rect_filled(self, x1, y1, x2, y2):
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"""
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Draw a filled black rectangle from (*x1*, *y1*) to (*x2*, *y2*).
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"""
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raise NotImplementedError()
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def get_results(self, box):
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"""
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Return a backend-specific tuple to return to the backend after
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all processing is done.
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"""
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raise NotImplementedError()
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def get_hinting_type(self):
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"""
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Get the FreeType hinting type to use with this particular
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backend.
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"""
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return LOAD_NO_HINTING
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class MathtextBackendAgg(MathtextBackend):
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"""
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Render glyphs and rectangles to an FTImage buffer, which is later
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transferred to the Agg image by the Agg backend.
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"""
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def __init__(self):
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self.ox = 0
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self.oy = 0
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self.image = None
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self.mode = 'bbox'
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self.bbox = [0, 0, 0, 0]
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MathtextBackend.__init__(self)
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def _update_bbox(self, x1, y1, x2, y2):
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self.bbox = [min(self.bbox[0], x1),
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min(self.bbox[1], y1),
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max(self.bbox[2], x2),
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max(self.bbox[3], y2)]
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def set_canvas_size(self, w, h, d):
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MathtextBackend.set_canvas_size(self, w, h, d)
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if self.mode != 'bbox':
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self.image = FT2Image(np.ceil(w), np.ceil(h + max(d, 0)))
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def render_glyph(self, ox, oy, info):
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if self.mode == 'bbox':
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self._update_bbox(ox + info.metrics.xmin,
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oy - info.metrics.ymax,
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ox + info.metrics.xmax,
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oy - info.metrics.ymin)
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else:
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info.font.draw_glyph_to_bitmap(
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self.image, ox, oy - info.metrics.iceberg, info.glyph,
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antialiased=rcParams['text.antialiased'])
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def render_rect_filled(self, x1, y1, x2, y2):
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if self.mode == 'bbox':
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self._update_bbox(x1, y1, x2, y2)
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else:
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height = max(int(y2 - y1) - 1, 0)
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if height == 0:
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center = (y2 + y1) / 2.0
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y = int(center - (height + 1) / 2.0)
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else:
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y = int(y1)
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self.image.draw_rect_filled(int(x1), y, np.ceil(x2), y + height)
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def get_results(self, box, used_characters):
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self.mode = 'bbox'
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orig_height = box.height
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orig_depth = box.depth
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ship(0, 0, box)
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bbox = self.bbox
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bbox = [bbox[0] - 1, bbox[1] - 1, bbox[2] + 1, bbox[3] + 1]
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self.mode = 'render'
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self.set_canvas_size(
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bbox[2] - bbox[0],
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(bbox[3] - bbox[1]) - orig_depth,
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(bbox[3] - bbox[1]) - orig_height)
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ship(-bbox[0], -bbox[1], box)
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result = (self.ox,
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self.oy,
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self.width,
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self.height + self.depth,
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self.depth,
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self.image,
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used_characters)
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self.image = None
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return result
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def get_hinting_type(self):
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from matplotlib.backends import backend_agg
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return backend_agg.get_hinting_flag()
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class MathtextBackendBitmap(MathtextBackendAgg):
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def get_results(self, box, used_characters):
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ox, oy, width, height, depth, image, characters = \
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MathtextBackendAgg.get_results(self, box, used_characters)
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return image, depth
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class MathtextBackendPs(MathtextBackend):
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"""
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Store information to write a mathtext rendering to the PostScript backend.
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"""
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_PSResult = namedtuple(
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"_PSResult", "width height depth pswriter used_characters")
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def __init__(self):
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self.pswriter = StringIO()
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self.lastfont = None
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def render_glyph(self, ox, oy, info):
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oy = self.height - oy + info.offset
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postscript_name = info.postscript_name
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fontsize = info.fontsize
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symbol_name = info.symbol_name
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if (postscript_name, fontsize) != self.lastfont:
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self.lastfont = postscript_name, fontsize
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self.pswriter.write(
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f"/{postscript_name} findfont\n"
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f"{fontsize} scalefont\n"
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f"setfont\n")
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self.pswriter.write(
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f"{ox:f} {oy:f} moveto\n"
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f"/{symbol_name} glyphshow\n")
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def render_rect_filled(self, x1, y1, x2, y2):
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ps = "%f %f %f %f rectfill\n" % (
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x1, self.height - y2, x2 - x1, y2 - y1)
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self.pswriter.write(ps)
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def get_results(self, box, used_characters):
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ship(0, 0, box)
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return self._PSResult(self.width,
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self.height + self.depth,
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self.depth,
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self.pswriter,
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used_characters)
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class MathtextBackendPdf(MathtextBackend):
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"""Store information to write a mathtext rendering to the PDF backend."""
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_PDFResult = namedtuple(
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"_PDFResult", "width height depth glyphs rects used_characters")
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def __init__(self):
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self.glyphs = []
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self.rects = []
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def render_glyph(self, ox, oy, info):
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filename = info.font.fname
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oy = self.height - oy + info.offset
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self.glyphs.append(
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(ox, oy, filename, info.fontsize,
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info.num, info.symbol_name))
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def render_rect_filled(self, x1, y1, x2, y2):
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self.rects.append((x1, self.height - y2, x2 - x1, y2 - y1))
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def get_results(self, box, used_characters):
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ship(0, 0, box)
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return self._PDFResult(self.width,
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self.height + self.depth,
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self.depth,
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self.glyphs,
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self.rects,
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used_characters)
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class MathtextBackendSvg(MathtextBackend):
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"""
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Store information to write a mathtext rendering to the SVG
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backend.
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"""
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def __init__(self):
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self.svg_glyphs = []
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self.svg_rects = []
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def render_glyph(self, ox, oy, info):
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oy = self.height - oy + info.offset
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self.svg_glyphs.append(
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(info.font, info.fontsize, info.num, ox, oy, info.metrics))
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def render_rect_filled(self, x1, y1, x2, y2):
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self.svg_rects.append(
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(x1, self.height - y1 + 1, x2 - x1, y2 - y1))
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def get_results(self, box, used_characters):
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ship(0, 0, box)
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svg_elements = types.SimpleNamespace(svg_glyphs=self.svg_glyphs,
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svg_rects=self.svg_rects)
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return (self.width,
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self.height + self.depth,
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self.depth,
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svg_elements,
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used_characters)
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class MathtextBackendPath(MathtextBackend):
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"""
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Store information to write a mathtext rendering to the text path
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machinery.
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"""
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def __init__(self):
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self.glyphs = []
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self.rects = []
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def render_glyph(self, ox, oy, info):
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oy = self.height - oy + info.offset
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thetext = info.num
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self.glyphs.append(
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(info.font, info.fontsize, thetext, ox, oy))
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def render_rect_filled(self, x1, y1, x2, y2):
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self.rects.append((x1, self.height - y2, x2 - x1, y2 - y1))
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def get_results(self, box, used_characters):
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ship(0, 0, box)
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return (self.width,
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self.height + self.depth,
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self.depth,
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self.glyphs,
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self.rects)
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class MathtextBackendCairo(MathtextBackend):
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"""
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Store information to write a mathtext rendering to the Cairo
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backend.
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"""
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def __init__(self):
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self.glyphs = []
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self.rects = []
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def render_glyph(self, ox, oy, info):
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oy = oy - info.offset - self.height
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thetext = chr(info.num)
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self.glyphs.append(
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(info.font, info.fontsize, thetext, ox, oy))
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def render_rect_filled(self, x1, y1, x2, y2):
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self.rects.append(
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(x1, y1 - self.height, x2 - x1, y2 - y1))
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def get_results(self, box, used_characters):
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ship(0, 0, box)
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return (self.width,
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self.height + self.depth,
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self.depth,
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self.glyphs,
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self.rects)
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class Fonts:
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"""
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An abstract base class for a system of fonts to use for mathtext.
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The class must be able to take symbol keys and font file names and
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return the character metrics. It also delegates to a backend class
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to do the actual drawing.
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"""
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def __init__(self, default_font_prop, mathtext_backend):
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"""
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*default_font_prop*: A
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:class:`~matplotlib.font_manager.FontProperties` object to use
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for the default non-math font, or the base font for Unicode
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(generic) font rendering.
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*mathtext_backend*: A subclass of :class:`MathTextBackend`
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used to delegate the actual rendering.
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"""
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self.default_font_prop = default_font_prop
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self.mathtext_backend = mathtext_backend
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self.used_characters = {}
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def destroy(self):
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"""
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Fix any cyclical references before the object is about
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to be destroyed.
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"""
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self.used_characters = None
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def get_kern(self, font1, fontclass1, sym1, fontsize1,
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font2, fontclass2, sym2, fontsize2, dpi):
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r"""
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Get the kerning distance for font between *sym1* and *sym2*.
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*fontX*: one of the TeX font names::
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tt, it, rm, cal, sf, bf or default/regular (non-math)
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*fontclassX*: TODO
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*symX*: a symbol in raw TeX form. e.g., '1', 'x' or '\sigma'
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*fontsizeX*: the fontsize in points
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*dpi*: the current dots-per-inch
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"""
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return 0.
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def get_metrics(self, font, font_class, sym, fontsize, dpi, math=True):
|
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r"""
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*font*: one of the TeX font names::
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tt, it, rm, cal, sf, bf or default/regular (non-math)
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*font_class*: TODO
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*sym*: a symbol in raw TeX form. e.g., '1', 'x' or '\sigma'
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*fontsize*: font size in points
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*dpi*: current dots-per-inch
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*math*: whether sym is a math character
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|
Returns an object with the following attributes:
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- *advance*: The advance distance (in points) of the glyph.
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- *height*: The height of the glyph in points.
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- *width*: The width of the glyph in points.
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- *xmin*, *xmax*, *ymin*, *ymax* - the ink rectangle of the glyph
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- *iceberg* - the distance from the baseline to the top of
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the glyph. This corresponds to TeX's definition of
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"height".
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"""
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info = self._get_info(font, font_class, sym, fontsize, dpi, math)
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return info.metrics
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|
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def set_canvas_size(self, w, h, d):
|
|
"""
|
|
Set the size of the buffer used to render the math expression.
|
|
Only really necessary for the bitmap backends.
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"""
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self.width, self.height, self.depth = np.ceil([w, h, d])
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self.mathtext_backend.set_canvas_size(
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self.width, self.height, self.depth)
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|
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def render_glyph(self, ox, oy, facename, font_class, sym, fontsize, dpi):
|
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"""
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Draw a glyph at
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|
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|
- *ox*, *oy*: position
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- *facename*: One of the TeX face names
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- *font_class*:
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- *sym*: TeX symbol name or single character
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- *fontsize*: fontsize in points
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- *dpi*: The dpi to draw at.
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"""
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info = self._get_info(facename, font_class, sym, fontsize, dpi)
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realpath, stat_key = get_realpath_and_stat(info.font.fname)
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used_characters = self.used_characters.setdefault(
|
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stat_key, (realpath, set()))
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used_characters[1].add(info.num)
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self.mathtext_backend.render_glyph(ox, oy, info)
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|
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def render_rect_filled(self, x1, y1, x2, y2):
|
|
"""
|
|
Draw a filled rectangle from (*x1*, *y1*) to (*x2*, *y2*).
|
|
"""
|
|
self.mathtext_backend.render_rect_filled(x1, y1, x2, y2)
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|
|
def get_xheight(self, font, fontsize, dpi):
|
|
"""
|
|
Get the xheight for the given *font* and *fontsize*.
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|
"""
|
|
raise NotImplementedError()
|
|
|
|
def get_underline_thickness(self, font, fontsize, dpi):
|
|
"""
|
|
Get the line thickness that matches the given font. Used as a
|
|
base unit for drawing lines such as in a fraction or radical.
|
|
"""
|
|
raise NotImplementedError()
|
|
|
|
def get_used_characters(self):
|
|
"""
|
|
Get the set of characters that were used in the math
|
|
expression. Used by backends that need to subset fonts so
|
|
they know which glyphs to include.
|
|
"""
|
|
return self.used_characters
|
|
|
|
def get_results(self, box):
|
|
"""
|
|
Get the data needed by the backend to render the math
|
|
expression. The return value is backend-specific.
|
|
"""
|
|
result = self.mathtext_backend.get_results(
|
|
box, self.get_used_characters())
|
|
self.destroy()
|
|
return result
|
|
|
|
def get_sized_alternatives_for_symbol(self, fontname, sym):
|
|
"""
|
|
Override if your font provides multiple sizes of the same
|
|
symbol. Should return a list of symbols matching *sym* in
|
|
various sizes. The expression renderer will select the most
|
|
appropriate size for a given situation from this list.
|
|
"""
|
|
return [(fontname, sym)]
|
|
|
|
|
|
class TruetypeFonts(Fonts):
|
|
"""
|
|
A generic base class for all font setups that use Truetype fonts
|
|
(through FT2Font).
|
|
"""
|
|
def __init__(self, default_font_prop, mathtext_backend):
|
|
Fonts.__init__(self, default_font_prop, mathtext_backend)
|
|
self.glyphd = {}
|
|
self._fonts = {}
|
|
|
|
filename = findfont(default_font_prop)
|
|
default_font = get_font(filename)
|
|
self._fonts['default'] = default_font
|
|
self._fonts['regular'] = default_font
|
|
|
|
def destroy(self):
|
|
self.glyphd = None
|
|
Fonts.destroy(self)
|
|
|
|
def _get_font(self, font):
|
|
if font in self.fontmap:
|
|
basename = self.fontmap[font]
|
|
else:
|
|
basename = font
|
|
cached_font = self._fonts.get(basename)
|
|
if cached_font is None and os.path.exists(basename):
|
|
cached_font = get_font(basename)
|
|
self._fonts[basename] = cached_font
|
|
self._fonts[cached_font.postscript_name] = cached_font
|
|
self._fonts[cached_font.postscript_name.lower()] = cached_font
|
|
return cached_font
|
|
|
|
def _get_offset(self, font, glyph, fontsize, dpi):
|
|
if font.postscript_name == 'Cmex10':
|
|
return ((glyph.height/64.0/2.0) + (fontsize/3.0 * dpi/72.0))
|
|
return 0.
|
|
|
|
def _get_info(self, fontname, font_class, sym, fontsize, dpi, math=True):
|
|
key = fontname, font_class, sym, fontsize, dpi
|
|
bunch = self.glyphd.get(key)
|
|
if bunch is not None:
|
|
return bunch
|
|
|
|
font, num, symbol_name, fontsize, slanted = \
|
|
self._get_glyph(fontname, font_class, sym, fontsize, math)
|
|
|
|
font.set_size(fontsize, dpi)
|
|
glyph = font.load_char(
|
|
num,
|
|
flags=self.mathtext_backend.get_hinting_type())
|
|
|
|
xmin, ymin, xmax, ymax = [val/64.0 for val in glyph.bbox]
|
|
offset = self._get_offset(font, glyph, fontsize, dpi)
|
|
metrics = types.SimpleNamespace(
|
|
advance = glyph.linearHoriAdvance/65536.0,
|
|
height = glyph.height/64.0,
|
|
width = glyph.width/64.0,
|
|
xmin = xmin,
|
|
xmax = xmax,
|
|
ymin = ymin+offset,
|
|
ymax = ymax+offset,
|
|
# iceberg is the equivalent of TeX's "height"
|
|
iceberg = glyph.horiBearingY/64.0 + offset,
|
|
slanted = slanted
|
|
)
|
|
|
|
result = self.glyphd[key] = types.SimpleNamespace(
|
|
font = font,
|
|
fontsize = fontsize,
|
|
postscript_name = font.postscript_name,
|
|
metrics = metrics,
|
|
symbol_name = symbol_name,
|
|
num = num,
|
|
glyph = glyph,
|
|
offset = offset
|
|
)
|
|
return result
|
|
|
|
def get_xheight(self, fontname, fontsize, dpi):
|
|
font = self._get_font(fontname)
|
|
font.set_size(fontsize, dpi)
|
|
pclt = font.get_sfnt_table('pclt')
|
|
if pclt is None:
|
|
# Some fonts don't store the xHeight, so we do a poor man's xHeight
|
|
metrics = self.get_metrics(
|
|
fontname, rcParams['mathtext.default'], 'x', fontsize, dpi)
|
|
return metrics.iceberg
|
|
xHeight = (pclt['xHeight'] / 64.0) * (fontsize / 12.0) * (dpi / 100.0)
|
|
return xHeight
|
|
|
|
def get_underline_thickness(self, font, fontsize, dpi):
|
|
# This function used to grab underline thickness from the font
|
|
# metrics, but that information is just too un-reliable, so it
|
|
# is now hardcoded.
|
|
return ((0.75 / 12.0) * fontsize * dpi) / 72.0
|
|
|
|
def get_kern(self, font1, fontclass1, sym1, fontsize1,
|
|
font2, fontclass2, sym2, fontsize2, dpi):
|
|
if font1 == font2 and fontsize1 == fontsize2:
|
|
info1 = self._get_info(font1, fontclass1, sym1, fontsize1, dpi)
|
|
info2 = self._get_info(font2, fontclass2, sym2, fontsize2, dpi)
|
|
font = info1.font
|
|
return font.get_kerning(info1.num, info2.num, KERNING_DEFAULT) / 64
|
|
return Fonts.get_kern(self, font1, fontclass1, sym1, fontsize1,
|
|
font2, fontclass2, sym2, fontsize2, dpi)
|
|
|
|
|
|
class BakomaFonts(TruetypeFonts):
|
|
"""
|
|
Use the Bakoma TrueType fonts for rendering.
|
|
|
|
Symbols are strewn about a number of font files, each of which has
|
|
its own proprietary 8-bit encoding.
|
|
"""
|
|
_fontmap = {
|
|
'cal': 'cmsy10',
|
|
'rm': 'cmr10',
|
|
'tt': 'cmtt10',
|
|
'it': 'cmmi10',
|
|
'bf': 'cmb10',
|
|
'sf': 'cmss10',
|
|
'ex': 'cmex10',
|
|
}
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
self._stix_fallback = StixFonts(*args, **kwargs)
|
|
|
|
TruetypeFonts.__init__(self, *args, **kwargs)
|
|
self.fontmap = {}
|
|
for key, val in self._fontmap.items():
|
|
fullpath = findfont(val)
|
|
self.fontmap[key] = fullpath
|
|
self.fontmap[val] = fullpath
|
|
|
|
_slanted_symbols = set(r"\int \oint".split())
|
|
|
|
def _get_glyph(self, fontname, font_class, sym, fontsize, math=True):
|
|
symbol_name = None
|
|
font = None
|
|
if fontname in self.fontmap and sym in latex_to_bakoma:
|
|
basename, num = latex_to_bakoma[sym]
|
|
slanted = (basename == "cmmi10") or sym in self._slanted_symbols
|
|
font = self._get_font(basename)
|
|
elif len(sym) == 1:
|
|
slanted = (fontname == "it")
|
|
font = self._get_font(fontname)
|
|
if font is not None:
|
|
num = ord(sym)
|
|
|
|
if font is not None:
|
|
gid = font.get_char_index(num)
|
|
if gid != 0:
|
|
symbol_name = font.get_glyph_name(gid)
|
|
|
|
if symbol_name is None:
|
|
return self._stix_fallback._get_glyph(
|
|
fontname, font_class, sym, fontsize, math)
|
|
|
|
return font, num, symbol_name, fontsize, slanted
|
|
|
|
# The Bakoma fonts contain many pre-sized alternatives for the
|
|
# delimiters. The AutoSizedChar class will use these alternatives
|
|
# and select the best (closest sized) glyph.
|
|
_size_alternatives = {
|
|
'(': [('rm', '('), ('ex', '\xa1'), ('ex', '\xb3'),
|
|
('ex', '\xb5'), ('ex', '\xc3')],
|
|
')': [('rm', ')'), ('ex', '\xa2'), ('ex', '\xb4'),
|
|
('ex', '\xb6'), ('ex', '\x21')],
|
|
'{': [('cal', '{'), ('ex', '\xa9'), ('ex', '\x6e'),
|
|
('ex', '\xbd'), ('ex', '\x28')],
|
|
'}': [('cal', '}'), ('ex', '\xaa'), ('ex', '\x6f'),
|
|
('ex', '\xbe'), ('ex', '\x29')],
|
|
# The fourth size of '[' is mysteriously missing from the BaKoMa
|
|
# font, so I've omitted it for both '[' and ']'
|
|
'[': [('rm', '['), ('ex', '\xa3'), ('ex', '\x68'),
|
|
('ex', '\x22')],
|
|
']': [('rm', ']'), ('ex', '\xa4'), ('ex', '\x69'),
|
|
('ex', '\x23')],
|
|
r'\lfloor': [('ex', '\xa5'), ('ex', '\x6a'),
|
|
('ex', '\xb9'), ('ex', '\x24')],
|
|
r'\rfloor': [('ex', '\xa6'), ('ex', '\x6b'),
|
|
('ex', '\xba'), ('ex', '\x25')],
|
|
r'\lceil': [('ex', '\xa7'), ('ex', '\x6c'),
|
|
('ex', '\xbb'), ('ex', '\x26')],
|
|
r'\rceil': [('ex', '\xa8'), ('ex', '\x6d'),
|
|
('ex', '\xbc'), ('ex', '\x27')],
|
|
r'\langle': [('ex', '\xad'), ('ex', '\x44'),
|
|
('ex', '\xbf'), ('ex', '\x2a')],
|
|
r'\rangle': [('ex', '\xae'), ('ex', '\x45'),
|
|
('ex', '\xc0'), ('ex', '\x2b')],
|
|
r'\__sqrt__': [('ex', '\x70'), ('ex', '\x71'),
|
|
('ex', '\x72'), ('ex', '\x73')],
|
|
r'\backslash': [('ex', '\xb2'), ('ex', '\x2f'),
|
|
('ex', '\xc2'), ('ex', '\x2d')],
|
|
r'/': [('rm', '/'), ('ex', '\xb1'), ('ex', '\x2e'),
|
|
('ex', '\xcb'), ('ex', '\x2c')],
|
|
r'\widehat': [('rm', '\x5e'), ('ex', '\x62'), ('ex', '\x63'),
|
|
('ex', '\x64')],
|
|
r'\widetilde': [('rm', '\x7e'), ('ex', '\x65'), ('ex', '\x66'),
|
|
('ex', '\x67')],
|
|
r'<': [('cal', 'h'), ('ex', 'D')],
|
|
r'>': [('cal', 'i'), ('ex', 'E')]
|
|
}
|
|
|
|
for alias, target in [(r'\leftparen', '('),
|
|
(r'\rightparent', ')'),
|
|
(r'\leftbrace', '{'),
|
|
(r'\rightbrace', '}'),
|
|
(r'\leftbracket', '['),
|
|
(r'\rightbracket', ']'),
|
|
(r'\{', '{'),
|
|
(r'\}', '}'),
|
|
(r'\[', '['),
|
|
(r'\]', ']')]:
|
|
_size_alternatives[alias] = _size_alternatives[target]
|
|
|
|
def get_sized_alternatives_for_symbol(self, fontname, sym):
|
|
return self._size_alternatives.get(sym, [(fontname, sym)])
|
|
|
|
|
|
class UnicodeFonts(TruetypeFonts):
|
|
"""
|
|
An abstract base class for handling Unicode fonts.
|
|
|
|
While some reasonably complete Unicode fonts (such as DejaVu) may
|
|
work in some situations, the only Unicode font I'm aware of with a
|
|
complete set of math symbols is STIX.
|
|
|
|
This class will "fallback" on the Bakoma fonts when a required
|
|
symbol can not be found in the font.
|
|
"""
|
|
use_cmex = True
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
# This must come first so the backend's owner is set correctly
|
|
if rcParams['mathtext.fallback_to_cm']:
|
|
self.cm_fallback = BakomaFonts(*args, **kwargs)
|
|
else:
|
|
self.cm_fallback = None
|
|
TruetypeFonts.__init__(self, *args, **kwargs)
|
|
self.fontmap = {}
|
|
for texfont in "cal rm tt it bf sf".split():
|
|
prop = rcParams['mathtext.' + texfont]
|
|
font = findfont(prop)
|
|
self.fontmap[texfont] = font
|
|
prop = FontProperties('cmex10')
|
|
font = findfont(prop)
|
|
self.fontmap['ex'] = font
|
|
|
|
_slanted_symbols = set(r"\int \oint".split())
|
|
|
|
def _map_virtual_font(self, fontname, font_class, uniindex):
|
|
return fontname, uniindex
|
|
|
|
def _get_glyph(self, fontname, font_class, sym, fontsize, math=True):
|
|
found_symbol = False
|
|
|
|
if self.use_cmex:
|
|
uniindex = latex_to_cmex.get(sym)
|
|
if uniindex is not None:
|
|
fontname = 'ex'
|
|
found_symbol = True
|
|
|
|
if not found_symbol:
|
|
try:
|
|
uniindex = get_unicode_index(sym, math)
|
|
found_symbol = True
|
|
except ValueError:
|
|
uniindex = ord('?')
|
|
_log.warning(
|
|
"No TeX to unicode mapping for {!a}.".format(sym))
|
|
|
|
fontname, uniindex = self._map_virtual_font(
|
|
fontname, font_class, uniindex)
|
|
|
|
new_fontname = fontname
|
|
|
|
# Only characters in the "Letter" class should be italicized in 'it'
|
|
# mode. Greek capital letters should be Roman.
|
|
if found_symbol:
|
|
if fontname == 'it' and uniindex < 0x10000:
|
|
char = chr(uniindex)
|
|
if (unicodedata.category(char)[0] != "L"
|
|
or unicodedata.name(char).startswith("GREEK CAPITAL")):
|
|
new_fontname = 'rm'
|
|
|
|
slanted = (new_fontname == 'it') or sym in self._slanted_symbols
|
|
found_symbol = False
|
|
font = self._get_font(new_fontname)
|
|
if font is not None:
|
|
glyphindex = font.get_char_index(uniindex)
|
|
if glyphindex != 0:
|
|
found_symbol = True
|
|
|
|
if not found_symbol:
|
|
if self.cm_fallback:
|
|
if isinstance(self.cm_fallback, BakomaFonts):
|
|
_log.warning(
|
|
"Substituting with a symbol from Computer Modern.")
|
|
if (fontname in ('it', 'regular') and
|
|
isinstance(self.cm_fallback, StixFonts)):
|
|
return self.cm_fallback._get_glyph(
|
|
'rm', font_class, sym, fontsize)
|
|
else:
|
|
return self.cm_fallback._get_glyph(
|
|
fontname, font_class, sym, fontsize)
|
|
else:
|
|
if (fontname in ('it', 'regular')
|
|
and isinstance(self, StixFonts)):
|
|
return self._get_glyph('rm', font_class, sym, fontsize)
|
|
_log.warning("Font {!r} does not have a glyph for {!a} "
|
|
"[U+{:x}], substituting with a dummy "
|
|
"symbol.".format(new_fontname, sym, uniindex))
|
|
fontname = 'rm'
|
|
font = self._get_font(fontname)
|
|
uniindex = 0xA4 # currency char, for lack of anything better
|
|
glyphindex = font.get_char_index(uniindex)
|
|
slanted = False
|
|
|
|
symbol_name = font.get_glyph_name(glyphindex)
|
|
return font, uniindex, symbol_name, fontsize, slanted
|
|
|
|
def get_sized_alternatives_for_symbol(self, fontname, sym):
|
|
if self.cm_fallback:
|
|
return self.cm_fallback.get_sized_alternatives_for_symbol(
|
|
fontname, sym)
|
|
return [(fontname, sym)]
|
|
|
|
|
|
class DejaVuFonts(UnicodeFonts):
|
|
use_cmex = False
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
# This must come first so the backend's owner is set correctly
|
|
if isinstance(self, DejaVuSerifFonts):
|
|
self.cm_fallback = StixFonts(*args, **kwargs)
|
|
else:
|
|
self.cm_fallback = StixSansFonts(*args, **kwargs)
|
|
self.bakoma = BakomaFonts(*args, **kwargs)
|
|
TruetypeFonts.__init__(self, *args, **kwargs)
|
|
self.fontmap = {}
|
|
# Include Stix sized alternatives for glyphs
|
|
self._fontmap.update({
|
|
1: 'STIXSizeOneSym',
|
|
2: 'STIXSizeTwoSym',
|
|
3: 'STIXSizeThreeSym',
|
|
4: 'STIXSizeFourSym',
|
|
5: 'STIXSizeFiveSym',
|
|
})
|
|
for key, name in self._fontmap.items():
|
|
fullpath = findfont(name)
|
|
self.fontmap[key] = fullpath
|
|
self.fontmap[name] = fullpath
|
|
|
|
def _get_glyph(self, fontname, font_class, sym, fontsize, math=True):
|
|
# Override prime symbol to use Bakoma.
|
|
if sym == r'\prime':
|
|
return self.bakoma._get_glyph(
|
|
fontname, font_class, sym, fontsize, math)
|
|
else:
|
|
# check whether the glyph is available in the display font
|
|
uniindex = get_unicode_index(sym)
|
|
font = self._get_font('ex')
|
|
if font is not None:
|
|
glyphindex = font.get_char_index(uniindex)
|
|
if glyphindex != 0:
|
|
return super()._get_glyph(
|
|
'ex', font_class, sym, fontsize, math)
|
|
# otherwise return regular glyph
|
|
return super()._get_glyph(
|
|
fontname, font_class, sym, fontsize, math)
|
|
|
|
|
|
class DejaVuSerifFonts(DejaVuFonts):
|
|
"""
|
|
A font handling class for the DejaVu Serif fonts
|
|
|
|
If a glyph is not found it will fallback to Stix Serif
|
|
"""
|
|
_fontmap = {
|
|
'rm': 'DejaVu Serif',
|
|
'it': 'DejaVu Serif:italic',
|
|
'bf': 'DejaVu Serif:weight=bold',
|
|
'sf': 'DejaVu Sans',
|
|
'tt': 'DejaVu Sans Mono',
|
|
'ex': 'DejaVu Serif Display',
|
|
0: 'DejaVu Serif',
|
|
}
|
|
|
|
|
|
class DejaVuSansFonts(DejaVuFonts):
|
|
"""
|
|
A font handling class for the DejaVu Sans fonts
|
|
|
|
If a glyph is not found it will fallback to Stix Sans
|
|
"""
|
|
_fontmap = {
|
|
'rm': 'DejaVu Sans',
|
|
'it': 'DejaVu Sans:italic',
|
|
'bf': 'DejaVu Sans:weight=bold',
|
|
'sf': 'DejaVu Sans',
|
|
'tt': 'DejaVu Sans Mono',
|
|
'ex': 'DejaVu Sans Display',
|
|
0: 'DejaVu Sans',
|
|
}
|
|
|
|
|
|
class StixFonts(UnicodeFonts):
|
|
"""
|
|
A font handling class for the STIX fonts.
|
|
|
|
In addition to what UnicodeFonts provides, this class:
|
|
|
|
- supports "virtual fonts" which are complete alpha numeric
|
|
character sets with different font styles at special Unicode
|
|
code points, such as "Blackboard".
|
|
|
|
- handles sized alternative characters for the STIXSizeX fonts.
|
|
"""
|
|
_fontmap = {
|
|
'rm': 'STIXGeneral',
|
|
'it': 'STIXGeneral:italic',
|
|
'bf': 'STIXGeneral:weight=bold',
|
|
'nonunirm': 'STIXNonUnicode',
|
|
'nonuniit': 'STIXNonUnicode:italic',
|
|
'nonunibf': 'STIXNonUnicode:weight=bold',
|
|
0: 'STIXGeneral',
|
|
1: 'STIXSizeOneSym',
|
|
2: 'STIXSizeTwoSym',
|
|
3: 'STIXSizeThreeSym',
|
|
4: 'STIXSizeFourSym',
|
|
5: 'STIXSizeFiveSym',
|
|
}
|
|
use_cmex = False
|
|
cm_fallback = False
|
|
_sans = False
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
TruetypeFonts.__init__(self, *args, **kwargs)
|
|
self.fontmap = {}
|
|
for key, name in self._fontmap.items():
|
|
fullpath = findfont(name)
|
|
self.fontmap[key] = fullpath
|
|
self.fontmap[name] = fullpath
|
|
|
|
def _map_virtual_font(self, fontname, font_class, uniindex):
|
|
# Handle these "fonts" that are actually embedded in
|
|
# other fonts.
|
|
mapping = stix_virtual_fonts.get(fontname)
|
|
if (self._sans and mapping is None
|
|
and fontname not in ('regular', 'default')):
|
|
mapping = stix_virtual_fonts['sf']
|
|
doing_sans_conversion = True
|
|
else:
|
|
doing_sans_conversion = False
|
|
|
|
if mapping is not None:
|
|
if isinstance(mapping, dict):
|
|
try:
|
|
mapping = mapping[font_class]
|
|
except KeyError:
|
|
mapping = mapping['rm']
|
|
|
|
# Binary search for the source glyph
|
|
lo = 0
|
|
hi = len(mapping)
|
|
while lo < hi:
|
|
mid = (lo+hi)//2
|
|
range = mapping[mid]
|
|
if uniindex < range[0]:
|
|
hi = mid
|
|
elif uniindex <= range[1]:
|
|
break
|
|
else:
|
|
lo = mid + 1
|
|
|
|
if range[0] <= uniindex <= range[1]:
|
|
uniindex = uniindex - range[0] + range[3]
|
|
fontname = range[2]
|
|
elif not doing_sans_conversion:
|
|
# This will generate a dummy character
|
|
uniindex = 0x1
|
|
fontname = rcParams['mathtext.default']
|
|
|
|
# Handle private use area glyphs
|
|
if fontname in ('it', 'rm', 'bf') and 0xe000 <= uniindex <= 0xf8ff:
|
|
fontname = 'nonuni' + fontname
|
|
|
|
return fontname, uniindex
|
|
|
|
@functools.lru_cache()
|
|
def get_sized_alternatives_for_symbol(self, fontname, sym):
|
|
fixes = {
|
|
'\\{': '{', '\\}': '}', '\\[': '[', '\\]': ']',
|
|
'<': '\N{MATHEMATICAL LEFT ANGLE BRACKET}',
|
|
'>': '\N{MATHEMATICAL RIGHT ANGLE BRACKET}',
|
|
}
|
|
sym = fixes.get(sym, sym)
|
|
try:
|
|
uniindex = get_unicode_index(sym)
|
|
except ValueError:
|
|
return [(fontname, sym)]
|
|
alternatives = [(i, chr(uniindex)) for i in range(6)
|
|
if self._get_font(i).get_char_index(uniindex) != 0]
|
|
# The largest size of the radical symbol in STIX has incorrect
|
|
# metrics that cause it to be disconnected from the stem.
|
|
if sym == r'\__sqrt__':
|
|
alternatives = alternatives[:-1]
|
|
return alternatives
|
|
|
|
|
|
class StixSansFonts(StixFonts):
|
|
"""
|
|
A font handling class for the STIX fonts (that uses sans-serif
|
|
characters by default).
|
|
"""
|
|
_sans = True
|
|
|
|
|
|
class StandardPsFonts(Fonts):
|
|
"""
|
|
Use the standard postscript fonts for rendering to backend_ps
|
|
|
|
Unlike the other font classes, BakomaFont and UnicodeFont, this
|
|
one requires the Ps backend.
|
|
"""
|
|
basepath = str(cbook._get_data_path('fonts/afm'))
|
|
|
|
fontmap = {
|
|
'cal': 'pzcmi8a', # Zapf Chancery
|
|
'rm': 'pncr8a', # New Century Schoolbook
|
|
'tt': 'pcrr8a', # Courier
|
|
'it': 'pncri8a', # New Century Schoolbook Italic
|
|
'sf': 'phvr8a', # Helvetica
|
|
'bf': 'pncb8a', # New Century Schoolbook Bold
|
|
None: 'psyr', # Symbol
|
|
}
|
|
|
|
def __init__(self, default_font_prop):
|
|
Fonts.__init__(self, default_font_prop, MathtextBackendPs())
|
|
self.glyphd = {}
|
|
self.fonts = {}
|
|
|
|
filename = findfont(default_font_prop, fontext='afm',
|
|
directory=self.basepath)
|
|
if filename is None:
|
|
filename = findfont('Helvetica', fontext='afm',
|
|
directory=self.basepath)
|
|
with open(filename, 'rb') as fd:
|
|
default_font = AFM(fd)
|
|
default_font.fname = filename
|
|
|
|
self.fonts['default'] = default_font
|
|
self.fonts['regular'] = default_font
|
|
self.pswriter = StringIO()
|
|
|
|
def _get_font(self, font):
|
|
if font in self.fontmap:
|
|
basename = self.fontmap[font]
|
|
else:
|
|
basename = font
|
|
|
|
cached_font = self.fonts.get(basename)
|
|
if cached_font is None:
|
|
fname = os.path.join(self.basepath, basename + ".afm")
|
|
with open(fname, 'rb') as fd:
|
|
cached_font = AFM(fd)
|
|
cached_font.fname = fname
|
|
self.fonts[basename] = cached_font
|
|
self.fonts[cached_font.get_fontname()] = cached_font
|
|
return cached_font
|
|
|
|
def _get_info(self, fontname, font_class, sym, fontsize, dpi, math=True):
|
|
'load the cmfont, metrics and glyph with caching'
|
|
key = fontname, sym, fontsize, dpi
|
|
tup = self.glyphd.get(key)
|
|
|
|
if tup is not None:
|
|
return tup
|
|
|
|
# Only characters in the "Letter" class should really be italicized.
|
|
# This class includes greek letters, so we're ok
|
|
if (fontname == 'it' and
|
|
(len(sym) > 1
|
|
or not unicodedata.category(sym).startswith("L"))):
|
|
fontname = 'rm'
|
|
|
|
found_symbol = False
|
|
|
|
if sym in latex_to_standard:
|
|
fontname, num = latex_to_standard[sym]
|
|
glyph = chr(num)
|
|
found_symbol = True
|
|
elif len(sym) == 1:
|
|
glyph = sym
|
|
num = ord(glyph)
|
|
found_symbol = True
|
|
else:
|
|
_log.warning(
|
|
"No TeX to built-in Postscript mapping for {!r}".format(sym))
|
|
|
|
slanted = (fontname == 'it')
|
|
font = self._get_font(fontname)
|
|
|
|
if found_symbol:
|
|
try:
|
|
symbol_name = font.get_name_char(glyph)
|
|
except KeyError:
|
|
_log.warning(
|
|
"No glyph in standard Postscript font {!r} for {!r}"
|
|
.format(font.get_fontname(), sym))
|
|
found_symbol = False
|
|
|
|
if not found_symbol:
|
|
glyph = '?'
|
|
num = ord(glyph)
|
|
symbol_name = font.get_name_char(glyph)
|
|
|
|
offset = 0
|
|
|
|
scale = 0.001 * fontsize
|
|
|
|
xmin, ymin, xmax, ymax = [val * scale
|
|
for val in font.get_bbox_char(glyph)]
|
|
metrics = types.SimpleNamespace(
|
|
advance = font.get_width_char(glyph) * scale,
|
|
width = font.get_width_char(glyph) * scale,
|
|
height = font.get_height_char(glyph) * scale,
|
|
xmin = xmin,
|
|
xmax = xmax,
|
|
ymin = ymin+offset,
|
|
ymax = ymax+offset,
|
|
# iceberg is the equivalent of TeX's "height"
|
|
iceberg = ymax + offset,
|
|
slanted = slanted
|
|
)
|
|
|
|
self.glyphd[key] = types.SimpleNamespace(
|
|
font = font,
|
|
fontsize = fontsize,
|
|
postscript_name = font.get_fontname(),
|
|
metrics = metrics,
|
|
symbol_name = symbol_name,
|
|
num = num,
|
|
glyph = glyph,
|
|
offset = offset
|
|
)
|
|
|
|
return self.glyphd[key]
|
|
|
|
def get_kern(self, font1, fontclass1, sym1, fontsize1,
|
|
font2, fontclass2, sym2, fontsize2, dpi):
|
|
if font1 == font2 and fontsize1 == fontsize2:
|
|
info1 = self._get_info(font1, fontclass1, sym1, fontsize1, dpi)
|
|
info2 = self._get_info(font2, fontclass2, sym2, fontsize2, dpi)
|
|
font = info1.font
|
|
return (font.get_kern_dist(info1.glyph, info2.glyph)
|
|
* 0.001 * fontsize1)
|
|
return Fonts.get_kern(self, font1, fontclass1, sym1, fontsize1,
|
|
font2, fontclass2, sym2, fontsize2, dpi)
|
|
|
|
def get_xheight(self, font, fontsize, dpi):
|
|
font = self._get_font(font)
|
|
return font.get_xheight() * 0.001 * fontsize
|
|
|
|
def get_underline_thickness(self, font, fontsize, dpi):
|
|
font = self._get_font(font)
|
|
return font.get_underline_thickness() * 0.001 * fontsize
|
|
|
|
|
|
##############################################################################
|
|
# TeX-LIKE BOX MODEL
|
|
|
|
# The following is based directly on the document 'woven' from the
|
|
# TeX82 source code. This information is also available in printed
|
|
# form:
|
|
#
|
|
# Knuth, Donald E.. 1986. Computers and Typesetting, Volume B:
|
|
# TeX: The Program. Addison-Wesley Professional.
|
|
#
|
|
# The most relevant "chapters" are:
|
|
# Data structures for boxes and their friends
|
|
# Shipping pages out (Ship class)
|
|
# Packaging (hpack and vpack)
|
|
# Data structures for math mode
|
|
# Subroutines for math mode
|
|
# Typesetting math formulas
|
|
#
|
|
# Many of the docstrings below refer to a numbered "node" in that
|
|
# book, e.g., node123
|
|
#
|
|
# Note that (as TeX) y increases downward, unlike many other parts of
|
|
# matplotlib.
|
|
|
|
# How much text shrinks when going to the next-smallest level. GROW_FACTOR
|
|
# must be the inverse of SHRINK_FACTOR.
|
|
SHRINK_FACTOR = 0.7
|
|
GROW_FACTOR = 1.0 / SHRINK_FACTOR
|
|
# The number of different sizes of chars to use, beyond which they will not
|
|
# get any smaller
|
|
NUM_SIZE_LEVELS = 6
|
|
|
|
|
|
class FontConstantsBase:
|
|
"""
|
|
A set of constants that controls how certain things, such as sub-
|
|
and superscripts are laid out. These are all metrics that can't
|
|
be reliably retrieved from the font metrics in the font itself.
|
|
"""
|
|
# Percentage of x-height of additional horiz. space after sub/superscripts
|
|
script_space = 0.05
|
|
|
|
# Percentage of x-height that sub/superscripts drop below the baseline
|
|
subdrop = 0.4
|
|
|
|
# Percentage of x-height that superscripts are raised from the baseline
|
|
sup1 = 0.7
|
|
|
|
# Percentage of x-height that subscripts drop below the baseline
|
|
sub1 = 0.3
|
|
|
|
# Percentage of x-height that subscripts drop below the baseline when a
|
|
# superscript is present
|
|
sub2 = 0.5
|
|
|
|
# Percentage of x-height that sub/supercripts are offset relative to the
|
|
# nucleus edge for non-slanted nuclei
|
|
delta = 0.025
|
|
|
|
# Additional percentage of last character height above 2/3 of the
|
|
# x-height that supercripts are offset relative to the subscript
|
|
# for slanted nuclei
|
|
delta_slanted = 0.2
|
|
|
|
# Percentage of x-height that supercripts and subscripts are offset for
|
|
# integrals
|
|
delta_integral = 0.1
|
|
|
|
|
|
class ComputerModernFontConstants(FontConstantsBase):
|
|
script_space = 0.075
|
|
subdrop = 0.2
|
|
sup1 = 0.45
|
|
sub1 = 0.2
|
|
sub2 = 0.3
|
|
delta = 0.075
|
|
delta_slanted = 0.3
|
|
delta_integral = 0.3
|
|
|
|
|
|
class STIXFontConstants(FontConstantsBase):
|
|
script_space = 0.1
|
|
sup1 = 0.8
|
|
sub2 = 0.6
|
|
delta = 0.05
|
|
delta_slanted = 0.3
|
|
delta_integral = 0.3
|
|
|
|
|
|
class STIXSansFontConstants(FontConstantsBase):
|
|
script_space = 0.05
|
|
sup1 = 0.8
|
|
delta_slanted = 0.6
|
|
delta_integral = 0.3
|
|
|
|
|
|
class DejaVuSerifFontConstants(FontConstantsBase):
|
|
pass
|
|
|
|
|
|
class DejaVuSansFontConstants(FontConstantsBase):
|
|
pass
|
|
|
|
|
|
# Maps font family names to the FontConstantBase subclass to use
|
|
_font_constant_mapping = {
|
|
'DejaVu Sans': DejaVuSansFontConstants,
|
|
'DejaVu Sans Mono': DejaVuSansFontConstants,
|
|
'DejaVu Serif': DejaVuSerifFontConstants,
|
|
'cmb10': ComputerModernFontConstants,
|
|
'cmex10': ComputerModernFontConstants,
|
|
'cmmi10': ComputerModernFontConstants,
|
|
'cmr10': ComputerModernFontConstants,
|
|
'cmss10': ComputerModernFontConstants,
|
|
'cmsy10': ComputerModernFontConstants,
|
|
'cmtt10': ComputerModernFontConstants,
|
|
'STIXGeneral': STIXFontConstants,
|
|
'STIXNonUnicode': STIXFontConstants,
|
|
'STIXSizeFiveSym': STIXFontConstants,
|
|
'STIXSizeFourSym': STIXFontConstants,
|
|
'STIXSizeThreeSym': STIXFontConstants,
|
|
'STIXSizeTwoSym': STIXFontConstants,
|
|
'STIXSizeOneSym': STIXFontConstants,
|
|
# Map the fonts we used to ship, just for good measure
|
|
'Bitstream Vera Sans': DejaVuSansFontConstants,
|
|
'Bitstream Vera': DejaVuSansFontConstants,
|
|
}
|
|
|
|
|
|
def _get_font_constant_set(state):
|
|
constants = _font_constant_mapping.get(
|
|
state.font_output._get_font(state.font).family_name,
|
|
FontConstantsBase)
|
|
# STIX sans isn't really its own fonts, just different code points
|
|
# in the STIX fonts, so we have to detect this one separately.
|
|
if (constants is STIXFontConstants and
|
|
isinstance(state.font_output, StixSansFonts)):
|
|
return STIXSansFontConstants
|
|
return constants
|
|
|
|
|
|
class MathTextWarning(Warning):
|
|
pass
|
|
|
|
|
|
class Node:
|
|
"""
|
|
A node in the TeX box model
|
|
"""
|
|
def __init__(self):
|
|
self.size = 0
|
|
|
|
def __repr__(self):
|
|
return self.__class__.__name__
|
|
|
|
def get_kerning(self, next):
|
|
return 0.0
|
|
|
|
def shrink(self):
|
|
"""
|
|
Shrinks one level smaller. There are only three levels of
|
|
sizes, after which things will no longer get smaller.
|
|
"""
|
|
self.size += 1
|
|
|
|
def grow(self):
|
|
"""
|
|
Grows one level larger. There is no limit to how big
|
|
something can get.
|
|
"""
|
|
self.size -= 1
|
|
|
|
def render(self, x, y):
|
|
pass
|
|
|
|
|
|
class Box(Node):
|
|
"""
|
|
Represents any node with a physical location.
|
|
"""
|
|
def __init__(self, width, height, depth):
|
|
Node.__init__(self)
|
|
self.width = width
|
|
self.height = height
|
|
self.depth = depth
|
|
|
|
def shrink(self):
|
|
Node.shrink(self)
|
|
if self.size < NUM_SIZE_LEVELS:
|
|
self.width *= SHRINK_FACTOR
|
|
self.height *= SHRINK_FACTOR
|
|
self.depth *= SHRINK_FACTOR
|
|
|
|
def grow(self):
|
|
Node.grow(self)
|
|
self.width *= GROW_FACTOR
|
|
self.height *= GROW_FACTOR
|
|
self.depth *= GROW_FACTOR
|
|
|
|
def render(self, x1, y1, x2, y2):
|
|
pass
|
|
|
|
|
|
class Vbox(Box):
|
|
"""
|
|
A box with only height (zero width).
|
|
"""
|
|
def __init__(self, height, depth):
|
|
Box.__init__(self, 0., height, depth)
|
|
|
|
|
|
class Hbox(Box):
|
|
"""
|
|
A box with only width (zero height and depth).
|
|
"""
|
|
def __init__(self, width):
|
|
Box.__init__(self, width, 0., 0.)
|
|
|
|
|
|
class Char(Node):
|
|
"""
|
|
Represents a single character. Unlike TeX, the font information
|
|
and metrics are stored with each :class:`Char` to make it easier
|
|
to lookup the font metrics when needed. Note that TeX boxes have
|
|
a width, height, and depth, unlike Type1 and Truetype which use a
|
|
full bounding box and an advance in the x-direction. The metrics
|
|
must be converted to the TeX way, and the advance (if different
|
|
from width) must be converted into a :class:`Kern` node when the
|
|
:class:`Char` is added to its parent :class:`Hlist`.
|
|
"""
|
|
def __init__(self, c, state, math=True):
|
|
Node.__init__(self)
|
|
self.c = c
|
|
self.font_output = state.font_output
|
|
self.font = state.font
|
|
self.font_class = state.font_class
|
|
self.fontsize = state.fontsize
|
|
self.dpi = state.dpi
|
|
self.math = math
|
|
# The real width, height and depth will be set during the
|
|
# pack phase, after we know the real fontsize
|
|
self._update_metrics()
|
|
|
|
def __repr__(self):
|
|
return '`%s`' % self.c
|
|
|
|
def _update_metrics(self):
|
|
metrics = self._metrics = self.font_output.get_metrics(
|
|
self.font, self.font_class, self.c, self.fontsize, self.dpi,
|
|
self.math)
|
|
if self.c == ' ':
|
|
self.width = metrics.advance
|
|
else:
|
|
self.width = metrics.width
|
|
self.height = metrics.iceberg
|
|
self.depth = -(metrics.iceberg - metrics.height)
|
|
|
|
def is_slanted(self):
|
|
return self._metrics.slanted
|
|
|
|
def get_kerning(self, next):
|
|
"""
|
|
Return the amount of kerning between this and the given
|
|
character. Called when characters are strung together into
|
|
:class:`Hlist` to create :class:`Kern` nodes.
|
|
"""
|
|
advance = self._metrics.advance - self.width
|
|
kern = 0.
|
|
if isinstance(next, Char):
|
|
kern = self.font_output.get_kern(
|
|
self.font, self.font_class, self.c, self.fontsize,
|
|
next.font, next.font_class, next.c, next.fontsize,
|
|
self.dpi)
|
|
return advance + kern
|
|
|
|
def render(self, x, y):
|
|
"""
|
|
Render the character to the canvas
|
|
"""
|
|
self.font_output.render_glyph(
|
|
x, y,
|
|
self.font, self.font_class, self.c, self.fontsize, self.dpi)
|
|
|
|
def shrink(self):
|
|
Node.shrink(self)
|
|
if self.size < NUM_SIZE_LEVELS:
|
|
self.fontsize *= SHRINK_FACTOR
|
|
self.width *= SHRINK_FACTOR
|
|
self.height *= SHRINK_FACTOR
|
|
self.depth *= SHRINK_FACTOR
|
|
|
|
def grow(self):
|
|
Node.grow(self)
|
|
self.fontsize *= GROW_FACTOR
|
|
self.width *= GROW_FACTOR
|
|
self.height *= GROW_FACTOR
|
|
self.depth *= GROW_FACTOR
|
|
|
|
|
|
class Accent(Char):
|
|
"""
|
|
The font metrics need to be dealt with differently for accents,
|
|
since they are already offset correctly from the baseline in
|
|
TrueType fonts.
|
|
"""
|
|
def _update_metrics(self):
|
|
metrics = self._metrics = self.font_output.get_metrics(
|
|
self.font, self.font_class, self.c, self.fontsize, self.dpi)
|
|
self.width = metrics.xmax - metrics.xmin
|
|
self.height = metrics.ymax - metrics.ymin
|
|
self.depth = 0
|
|
|
|
def shrink(self):
|
|
Char.shrink(self)
|
|
self._update_metrics()
|
|
|
|
def grow(self):
|
|
Char.grow(self)
|
|
self._update_metrics()
|
|
|
|
def render(self, x, y):
|
|
"""
|
|
Render the character to the canvas.
|
|
"""
|
|
self.font_output.render_glyph(
|
|
x - self._metrics.xmin, y + self._metrics.ymin,
|
|
self.font, self.font_class, self.c, self.fontsize, self.dpi)
|
|
|
|
|
|
class List(Box):
|
|
"""
|
|
A list of nodes (either horizontal or vertical).
|
|
"""
|
|
def __init__(self, elements):
|
|
Box.__init__(self, 0., 0., 0.)
|
|
self.shift_amount = 0. # An arbitrary offset
|
|
self.children = elements # The child nodes of this list
|
|
# The following parameters are set in the vpack and hpack functions
|
|
self.glue_set = 0. # The glue setting of this list
|
|
self.glue_sign = 0 # 0: normal, -1: shrinking, 1: stretching
|
|
self.glue_order = 0 # The order of infinity (0 - 3) for the glue
|
|
|
|
def __repr__(self):
|
|
return '[%s <%.02f %.02f %.02f %.02f> %s]' % (
|
|
super().__repr__(),
|
|
self.width, self.height,
|
|
self.depth, self.shift_amount,
|
|
' '.join([repr(x) for x in self.children]))
|
|
|
|
@staticmethod
|
|
def _determine_order(totals):
|
|
"""
|
|
Determine the highest order of glue used by the members of this list.
|
|
|
|
Helper function used by vpack and hpack.
|
|
"""
|
|
for i in range(len(totals))[::-1]:
|
|
if totals[i] != 0:
|
|
return i
|
|
return 0
|
|
|
|
def _set_glue(self, x, sign, totals, error_type):
|
|
o = self._determine_order(totals)
|
|
self.glue_order = o
|
|
self.glue_sign = sign
|
|
if totals[o] != 0.:
|
|
self.glue_set = x / totals[o]
|
|
else:
|
|
self.glue_sign = 0
|
|
self.glue_ratio = 0.
|
|
if o == 0:
|
|
if len(self.children):
|
|
_log.warning("%s %s: %r",
|
|
error_type, self.__class__.__name__, self)
|
|
|
|
def shrink(self):
|
|
for child in self.children:
|
|
child.shrink()
|
|
Box.shrink(self)
|
|
if self.size < NUM_SIZE_LEVELS:
|
|
self.shift_amount *= SHRINK_FACTOR
|
|
self.glue_set *= SHRINK_FACTOR
|
|
|
|
def grow(self):
|
|
for child in self.children:
|
|
child.grow()
|
|
Box.grow(self)
|
|
self.shift_amount *= GROW_FACTOR
|
|
self.glue_set *= GROW_FACTOR
|
|
|
|
|
|
class Hlist(List):
|
|
"""
|
|
A horizontal list of boxes.
|
|
"""
|
|
def __init__(self, elements, w=0., m='additional', do_kern=True):
|
|
List.__init__(self, elements)
|
|
if do_kern:
|
|
self.kern()
|
|
self.hpack()
|
|
|
|
def kern(self):
|
|
"""
|
|
Insert :class:`Kern` nodes between :class:`Char` nodes to set
|
|
kerning. The :class:`Char` nodes themselves determine the
|
|
amount of kerning they need (in :meth:`~Char.get_kerning`),
|
|
and this function just creates the linked list in the correct
|
|
way.
|
|
"""
|
|
new_children = []
|
|
num_children = len(self.children)
|
|
if num_children:
|
|
for i in range(num_children):
|
|
elem = self.children[i]
|
|
if i < num_children - 1:
|
|
next = self.children[i + 1]
|
|
else:
|
|
next = None
|
|
|
|
new_children.append(elem)
|
|
kerning_distance = elem.get_kerning(next)
|
|
if kerning_distance != 0.:
|
|
kern = Kern(kerning_distance)
|
|
new_children.append(kern)
|
|
self.children = new_children
|
|
|
|
# This is a failed experiment to fake cross-font kerning.
|
|
# def get_kerning(self, next):
|
|
# if len(self.children) >= 2 and isinstance(self.children[-2], Char):
|
|
# if isinstance(next, Char):
|
|
# print "CASE A"
|
|
# return self.children[-2].get_kerning(next)
|
|
# elif (isinstance(next, Hlist) and len(next.children)
|
|
# and isinstance(next.children[0], Char)):
|
|
# print "CASE B"
|
|
# result = self.children[-2].get_kerning(next.children[0])
|
|
# print result
|
|
# return result
|
|
# return 0.0
|
|
|
|
def hpack(self, w=0., m='additional'):
|
|
r"""
|
|
The main duty of :meth:`hpack` is to compute the dimensions of
|
|
the resulting boxes, and to adjust the glue if one of those
|
|
dimensions is pre-specified. The computed sizes normally
|
|
enclose all of the material inside the new box; but some items
|
|
may stick out if negative glue is used, if the box is
|
|
overfull, or if a ``\vbox`` includes other boxes that have
|
|
been shifted left.
|
|
|
|
- *w*: specifies a width
|
|
|
|
- *m*: is either 'exactly' or 'additional'.
|
|
|
|
Thus, ``hpack(w, 'exactly')`` produces a box whose width is
|
|
exactly *w*, while ``hpack(w, 'additional')`` yields a box
|
|
whose width is the natural width plus *w*. The default values
|
|
produce a box with the natural width.
|
|
"""
|
|
# I don't know why these get reset in TeX. Shift_amount is pretty
|
|
# much useless if we do.
|
|
# self.shift_amount = 0.
|
|
h = 0.
|
|
d = 0.
|
|
x = 0.
|
|
total_stretch = [0.] * 4
|
|
total_shrink = [0.] * 4
|
|
for p in self.children:
|
|
if isinstance(p, Char):
|
|
x += p.width
|
|
h = max(h, p.height)
|
|
d = max(d, p.depth)
|
|
elif isinstance(p, Box):
|
|
x += p.width
|
|
if not np.isinf(p.height) and not np.isinf(p.depth):
|
|
s = getattr(p, 'shift_amount', 0.)
|
|
h = max(h, p.height - s)
|
|
d = max(d, p.depth + s)
|
|
elif isinstance(p, Glue):
|
|
glue_spec = p.glue_spec
|
|
x += glue_spec.width
|
|
total_stretch[glue_spec.stretch_order] += glue_spec.stretch
|
|
total_shrink[glue_spec.shrink_order] += glue_spec.shrink
|
|
elif isinstance(p, Kern):
|
|
x += p.width
|
|
self.height = h
|
|
self.depth = d
|
|
|
|
if m == 'additional':
|
|
w += x
|
|
self.width = w
|
|
x = w - x
|
|
|
|
if x == 0.:
|
|
self.glue_sign = 0
|
|
self.glue_order = 0
|
|
self.glue_ratio = 0.
|
|
return
|
|
if x > 0.:
|
|
self._set_glue(x, 1, total_stretch, "Overfull")
|
|
else:
|
|
self._set_glue(x, -1, total_shrink, "Underfull")
|
|
|
|
|
|
class Vlist(List):
|
|
"""
|
|
A vertical list of boxes.
|
|
"""
|
|
def __init__(self, elements, h=0., m='additional'):
|
|
List.__init__(self, elements)
|
|
self.vpack()
|
|
|
|
def vpack(self, h=0., m='additional', l=np.inf):
|
|
"""
|
|
The main duty of :meth:`vpack` is to compute the dimensions of
|
|
the resulting boxes, and to adjust the glue if one of those
|
|
dimensions is pre-specified.
|
|
|
|
- *h*: specifies a height
|
|
- *m*: is either 'exactly' or 'additional'.
|
|
- *l*: a maximum height
|
|
|
|
Thus, ``vpack(h, 'exactly')`` produces a box whose height is
|
|
exactly *h*, while ``vpack(h, 'additional')`` yields a box
|
|
whose height is the natural height plus *h*. The default
|
|
values produce a box with the natural width.
|
|
"""
|
|
# I don't know why these get reset in TeX. Shift_amount is pretty
|
|
# much useless if we do.
|
|
# self.shift_amount = 0.
|
|
w = 0.
|
|
d = 0.
|
|
x = 0.
|
|
total_stretch = [0.] * 4
|
|
total_shrink = [0.] * 4
|
|
for p in self.children:
|
|
if isinstance(p, Box):
|
|
x += d + p.height
|
|
d = p.depth
|
|
if not np.isinf(p.width):
|
|
s = getattr(p, 'shift_amount', 0.)
|
|
w = max(w, p.width + s)
|
|
elif isinstance(p, Glue):
|
|
x += d
|
|
d = 0.
|
|
glue_spec = p.glue_spec
|
|
x += glue_spec.width
|
|
total_stretch[glue_spec.stretch_order] += glue_spec.stretch
|
|
total_shrink[glue_spec.shrink_order] += glue_spec.shrink
|
|
elif isinstance(p, Kern):
|
|
x += d + p.width
|
|
d = 0.
|
|
elif isinstance(p, Char):
|
|
raise RuntimeError(
|
|
"Internal mathtext error: Char node found in Vlist")
|
|
|
|
self.width = w
|
|
if d > l:
|
|
x += d - l
|
|
self.depth = l
|
|
else:
|
|
self.depth = d
|
|
|
|
if m == 'additional':
|
|
h += x
|
|
self.height = h
|
|
x = h - x
|
|
|
|
if x == 0:
|
|
self.glue_sign = 0
|
|
self.glue_order = 0
|
|
self.glue_ratio = 0.
|
|
return
|
|
|
|
if x > 0.:
|
|
self._set_glue(x, 1, total_stretch, "Overfull")
|
|
else:
|
|
self._set_glue(x, -1, total_shrink, "Underfull")
|
|
|
|
|
|
class Rule(Box):
|
|
"""
|
|
A :class:`Rule` node stands for a solid black rectangle; it has
|
|
*width*, *depth*, and *height* fields just as in an
|
|
:class:`Hlist`. However, if any of these dimensions is inf, the
|
|
actual value will be determined by running the rule up to the
|
|
boundary of the innermost enclosing box. This is called a "running
|
|
dimension." The width is never running in an :class:`Hlist`; the
|
|
height and depth are never running in a :class:`Vlist`.
|
|
"""
|
|
def __init__(self, width, height, depth, state):
|
|
Box.__init__(self, width, height, depth)
|
|
self.font_output = state.font_output
|
|
|
|
def render(self, x, y, w, h):
|
|
self.font_output.render_rect_filled(x, y, x + w, y + h)
|
|
|
|
|
|
class Hrule(Rule):
|
|
"""
|
|
Convenience class to create a horizontal rule.
|
|
"""
|
|
def __init__(self, state, thickness=None):
|
|
if thickness is None:
|
|
thickness = state.font_output.get_underline_thickness(
|
|
state.font, state.fontsize, state.dpi)
|
|
height = depth = thickness * 0.5
|
|
Rule.__init__(self, np.inf, height, depth, state)
|
|
|
|
|
|
class Vrule(Rule):
|
|
"""
|
|
Convenience class to create a vertical rule.
|
|
"""
|
|
def __init__(self, state):
|
|
thickness = state.font_output.get_underline_thickness(
|
|
state.font, state.fontsize, state.dpi)
|
|
Rule.__init__(self, thickness, np.inf, np.inf, state)
|
|
|
|
|
|
class Glue(Node):
|
|
"""
|
|
Most of the information in this object is stored in the underlying
|
|
:class:`GlueSpec` class, which is shared between multiple glue objects.
|
|
(This is a memory optimization which probably doesn't matter anymore, but
|
|
it's easier to stick to what TeX does.)
|
|
"""
|
|
def __init__(self, glue_type, copy=False):
|
|
Node.__init__(self)
|
|
self.glue_subtype = 'normal'
|
|
if isinstance(glue_type, str):
|
|
glue_spec = GlueSpec.factory(glue_type)
|
|
elif isinstance(glue_type, GlueSpec):
|
|
glue_spec = glue_type
|
|
else:
|
|
raise ValueError("glue_type must be a glue spec name or instance")
|
|
if copy:
|
|
glue_spec = glue_spec.copy()
|
|
self.glue_spec = glue_spec
|
|
|
|
def shrink(self):
|
|
Node.shrink(self)
|
|
if self.size < NUM_SIZE_LEVELS:
|
|
if self.glue_spec.width != 0.:
|
|
self.glue_spec = self.glue_spec.copy()
|
|
self.glue_spec.width *= SHRINK_FACTOR
|
|
|
|
def grow(self):
|
|
Node.grow(self)
|
|
if self.glue_spec.width != 0.:
|
|
self.glue_spec = self.glue_spec.copy()
|
|
self.glue_spec.width *= GROW_FACTOR
|
|
|
|
|
|
class GlueSpec:
|
|
"""
|
|
See :class:`Glue`.
|
|
"""
|
|
def __init__(self, width=0., stretch=0., stretch_order=0,
|
|
shrink=0., shrink_order=0):
|
|
self.width = width
|
|
self.stretch = stretch
|
|
self.stretch_order = stretch_order
|
|
self.shrink = shrink
|
|
self.shrink_order = shrink_order
|
|
|
|
def copy(self):
|
|
return GlueSpec(
|
|
self.width,
|
|
self.stretch,
|
|
self.stretch_order,
|
|
self.shrink,
|
|
self.shrink_order)
|
|
|
|
@classmethod
|
|
def factory(cls, glue_type):
|
|
return cls._types[glue_type]
|
|
|
|
|
|
GlueSpec._types = {
|
|
'fil': GlueSpec(0., 1., 1, 0., 0),
|
|
'fill': GlueSpec(0., 1., 2, 0., 0),
|
|
'filll': GlueSpec(0., 1., 3, 0., 0),
|
|
'neg_fil': GlueSpec(0., 0., 0, 1., 1),
|
|
'neg_fill': GlueSpec(0., 0., 0, 1., 2),
|
|
'neg_filll': GlueSpec(0., 0., 0, 1., 3),
|
|
'empty': GlueSpec(0., 0., 0, 0., 0),
|
|
'ss': GlueSpec(0., 1., 1, -1., 1)
|
|
}
|
|
|
|
|
|
# Some convenient ways to get common kinds of glue
|
|
|
|
|
|
class Fil(Glue):
|
|
def __init__(self):
|
|
Glue.__init__(self, 'fil')
|
|
|
|
|
|
class Fill(Glue):
|
|
def __init__(self):
|
|
Glue.__init__(self, 'fill')
|
|
|
|
|
|
class Filll(Glue):
|
|
def __init__(self):
|
|
Glue.__init__(self, 'filll')
|
|
|
|
|
|
class NegFil(Glue):
|
|
def __init__(self):
|
|
Glue.__init__(self, 'neg_fil')
|
|
|
|
|
|
class NegFill(Glue):
|
|
def __init__(self):
|
|
Glue.__init__(self, 'neg_fill')
|
|
|
|
|
|
class NegFilll(Glue):
|
|
def __init__(self):
|
|
Glue.__init__(self, 'neg_filll')
|
|
|
|
|
|
class SsGlue(Glue):
|
|
def __init__(self):
|
|
Glue.__init__(self, 'ss')
|
|
|
|
|
|
class HCentered(Hlist):
|
|
"""
|
|
A convenience class to create an :class:`Hlist` whose contents are
|
|
centered within its enclosing box.
|
|
"""
|
|
def __init__(self, elements):
|
|
Hlist.__init__(self, [SsGlue()] + elements + [SsGlue()],
|
|
do_kern=False)
|
|
|
|
|
|
class VCentered(Hlist):
|
|
"""
|
|
A convenience class to create a :class:`Vlist` whose contents are
|
|
centered within its enclosing box.
|
|
"""
|
|
def __init__(self, elements):
|
|
Vlist.__init__(self, [SsGlue()] + elements + [SsGlue()])
|
|
|
|
|
|
class Kern(Node):
|
|
"""
|
|
A :class:`Kern` node has a width field to specify a (normally
|
|
negative) amount of spacing. This spacing correction appears in
|
|
horizontal lists between letters like A and V when the font
|
|
designer said that it looks better to move them closer together or
|
|
further apart. A kern node can also appear in a vertical list,
|
|
when its *width* denotes additional spacing in the vertical
|
|
direction.
|
|
"""
|
|
height = 0
|
|
depth = 0
|
|
|
|
def __init__(self, width):
|
|
Node.__init__(self)
|
|
self.width = width
|
|
|
|
def __repr__(self):
|
|
return "k%.02f" % self.width
|
|
|
|
def shrink(self):
|
|
Node.shrink(self)
|
|
if self.size < NUM_SIZE_LEVELS:
|
|
self.width *= SHRINK_FACTOR
|
|
|
|
def grow(self):
|
|
Node.grow(self)
|
|
self.width *= GROW_FACTOR
|
|
|
|
|
|
class SubSuperCluster(Hlist):
|
|
"""
|
|
:class:`SubSuperCluster` is a sort of hack to get around that fact
|
|
that this code do a two-pass parse like TeX. This lets us store
|
|
enough information in the hlist itself, namely the nucleus, sub-
|
|
and super-script, such that if another script follows that needs
|
|
to be attached, it can be reconfigured on the fly.
|
|
"""
|
|
def __init__(self):
|
|
self.nucleus = None
|
|
self.sub = None
|
|
self.super = None
|
|
Hlist.__init__(self, [])
|
|
|
|
|
|
class AutoHeightChar(Hlist):
|
|
"""
|
|
:class:`AutoHeightChar` will create a character as close to the
|
|
given height and depth as possible. When using a font with
|
|
multiple height versions of some characters (such as the BaKoMa
|
|
fonts), the correct glyph will be selected, otherwise this will
|
|
always just return a scaled version of the glyph.
|
|
"""
|
|
def __init__(self, c, height, depth, state, always=False, factor=None):
|
|
alternatives = state.font_output.get_sized_alternatives_for_symbol(
|
|
state.font, c)
|
|
|
|
xHeight = state.font_output.get_xheight(
|
|
state.font, state.fontsize, state.dpi)
|
|
|
|
state = state.copy()
|
|
target_total = height + depth
|
|
for fontname, sym in alternatives:
|
|
state.font = fontname
|
|
char = Char(sym, state)
|
|
# Ensure that size 0 is chosen when the text is regular sized but
|
|
# with descender glyphs by subtracting 0.2 * xHeight
|
|
if char.height + char.depth >= target_total - 0.2 * xHeight:
|
|
break
|
|
|
|
shift = 0
|
|
if state.font != 0:
|
|
if factor is None:
|
|
factor = (target_total) / (char.height + char.depth)
|
|
state.fontsize *= factor
|
|
char = Char(sym, state)
|
|
|
|
shift = (depth - char.depth)
|
|
|
|
Hlist.__init__(self, [char])
|
|
self.shift_amount = shift
|
|
|
|
|
|
class AutoWidthChar(Hlist):
|
|
"""
|
|
:class:`AutoWidthChar` will create a character as close to the
|
|
given width as possible. When using a font with multiple width
|
|
versions of some characters (such as the BaKoMa fonts), the
|
|
correct glyph will be selected, otherwise this will always just
|
|
return a scaled version of the glyph.
|
|
"""
|
|
def __init__(self, c, width, state, always=False, char_class=Char):
|
|
alternatives = state.font_output.get_sized_alternatives_for_symbol(
|
|
state.font, c)
|
|
|
|
state = state.copy()
|
|
for fontname, sym in alternatives:
|
|
state.font = fontname
|
|
char = char_class(sym, state)
|
|
if char.width >= width:
|
|
break
|
|
|
|
factor = width / char.width
|
|
state.fontsize *= factor
|
|
char = char_class(sym, state)
|
|
|
|
Hlist.__init__(self, [char])
|
|
self.width = char.width
|
|
|
|
|
|
class Ship:
|
|
"""
|
|
Once the boxes have been set up, this sends them to output. Since
|
|
boxes can be inside of boxes inside of boxes, the main work of
|
|
:class:`Ship` is done by two mutually recursive routines,
|
|
:meth:`hlist_out` and :meth:`vlist_out`, which traverse the
|
|
:class:`Hlist` nodes and :class:`Vlist` nodes inside of horizontal
|
|
and vertical boxes. The global variables used in TeX to store
|
|
state as it processes have become member variables here.
|
|
"""
|
|
def __call__(self, ox, oy, box):
|
|
self.max_push = 0 # Deepest nesting of push commands so far
|
|
self.cur_s = 0
|
|
self.cur_v = 0.
|
|
self.cur_h = 0.
|
|
self.off_h = ox
|
|
self.off_v = oy + box.height
|
|
self.hlist_out(box)
|
|
|
|
@staticmethod
|
|
def clamp(value):
|
|
if value < -1000000000.:
|
|
return -1000000000.
|
|
if value > 1000000000.:
|
|
return 1000000000.
|
|
return value
|
|
|
|
def hlist_out(self, box):
|
|
cur_g = 0
|
|
cur_glue = 0.
|
|
glue_order = box.glue_order
|
|
glue_sign = box.glue_sign
|
|
base_line = self.cur_v
|
|
left_edge = self.cur_h
|
|
self.cur_s += 1
|
|
self.max_push = max(self.cur_s, self.max_push)
|
|
clamp = self.clamp
|
|
|
|
for p in box.children:
|
|
if isinstance(p, Char):
|
|
p.render(self.cur_h + self.off_h, self.cur_v + self.off_v)
|
|
self.cur_h += p.width
|
|
elif isinstance(p, Kern):
|
|
self.cur_h += p.width
|
|
elif isinstance(p, List):
|
|
# node623
|
|
if len(p.children) == 0:
|
|
self.cur_h += p.width
|
|
else:
|
|
edge = self.cur_h
|
|
self.cur_v = base_line + p.shift_amount
|
|
if isinstance(p, Hlist):
|
|
self.hlist_out(p)
|
|
else:
|
|
# p.vpack(box.height + box.depth, 'exactly')
|
|
self.vlist_out(p)
|
|
self.cur_h = edge + p.width
|
|
self.cur_v = base_line
|
|
elif isinstance(p, Box):
|
|
# node624
|
|
rule_height = p.height
|
|
rule_depth = p.depth
|
|
rule_width = p.width
|
|
if np.isinf(rule_height):
|
|
rule_height = box.height
|
|
if np.isinf(rule_depth):
|
|
rule_depth = box.depth
|
|
if rule_height > 0 and rule_width > 0:
|
|
self.cur_v = base_line + rule_depth
|
|
p.render(self.cur_h + self.off_h,
|
|
self.cur_v + self.off_v,
|
|
rule_width, rule_height)
|
|
self.cur_v = base_line
|
|
self.cur_h += rule_width
|
|
elif isinstance(p, Glue):
|
|
# node625
|
|
glue_spec = p.glue_spec
|
|
rule_width = glue_spec.width - cur_g
|
|
if glue_sign != 0: # normal
|
|
if glue_sign == 1: # stretching
|
|
if glue_spec.stretch_order == glue_order:
|
|
cur_glue += glue_spec.stretch
|
|
cur_g = round(clamp(box.glue_set * cur_glue))
|
|
elif glue_spec.shrink_order == glue_order:
|
|
cur_glue += glue_spec.shrink
|
|
cur_g = round(clamp(box.glue_set * cur_glue))
|
|
rule_width += cur_g
|
|
self.cur_h += rule_width
|
|
self.cur_s -= 1
|
|
|
|
def vlist_out(self, box):
|
|
cur_g = 0
|
|
cur_glue = 0.
|
|
glue_order = box.glue_order
|
|
glue_sign = box.glue_sign
|
|
self.cur_s += 1
|
|
self.max_push = max(self.max_push, self.cur_s)
|
|
left_edge = self.cur_h
|
|
self.cur_v -= box.height
|
|
top_edge = self.cur_v
|
|
clamp = self.clamp
|
|
|
|
for p in box.children:
|
|
if isinstance(p, Kern):
|
|
self.cur_v += p.width
|
|
elif isinstance(p, List):
|
|
if len(p.children) == 0:
|
|
self.cur_v += p.height + p.depth
|
|
else:
|
|
self.cur_v += p.height
|
|
self.cur_h = left_edge + p.shift_amount
|
|
save_v = self.cur_v
|
|
p.width = box.width
|
|
if isinstance(p, Hlist):
|
|
self.hlist_out(p)
|
|
else:
|
|
self.vlist_out(p)
|
|
self.cur_v = save_v + p.depth
|
|
self.cur_h = left_edge
|
|
elif isinstance(p, Box):
|
|
rule_height = p.height
|
|
rule_depth = p.depth
|
|
rule_width = p.width
|
|
if np.isinf(rule_width):
|
|
rule_width = box.width
|
|
rule_height += rule_depth
|
|
if rule_height > 0 and rule_depth > 0:
|
|
self.cur_v += rule_height
|
|
p.render(self.cur_h + self.off_h,
|
|
self.cur_v + self.off_v,
|
|
rule_width, rule_height)
|
|
elif isinstance(p, Glue):
|
|
glue_spec = p.glue_spec
|
|
rule_height = glue_spec.width - cur_g
|
|
if glue_sign != 0: # normal
|
|
if glue_sign == 1: # stretching
|
|
if glue_spec.stretch_order == glue_order:
|
|
cur_glue += glue_spec.stretch
|
|
cur_g = round(clamp(box.glue_set * cur_glue))
|
|
elif glue_spec.shrink_order == glue_order: # shrinking
|
|
cur_glue += glue_spec.shrink
|
|
cur_g = round(clamp(box.glue_set * cur_glue))
|
|
rule_height += cur_g
|
|
self.cur_v += rule_height
|
|
elif isinstance(p, Char):
|
|
raise RuntimeError(
|
|
"Internal mathtext error: Char node found in vlist")
|
|
self.cur_s -= 1
|
|
|
|
|
|
ship = Ship()
|
|
|
|
|
|
##############################################################################
|
|
# PARSER
|
|
|
|
|
|
def Error(msg):
|
|
"""
|
|
Helper class to raise parser errors.
|
|
"""
|
|
def raise_error(s, loc, toks):
|
|
raise ParseFatalException(s, loc, msg)
|
|
|
|
empty = Empty()
|
|
empty.setParseAction(raise_error)
|
|
return empty
|
|
|
|
|
|
class Parser:
|
|
"""
|
|
This is the pyparsing-based parser for math expressions. It
|
|
actually parses full strings *containing* math expressions, in
|
|
that raw text may also appear outside of pairs of ``$``.
|
|
|
|
The grammar is based directly on that in TeX, though it cuts a few
|
|
corners.
|
|
"""
|
|
|
|
_math_style_dict = dict(displaystyle=0, textstyle=1,
|
|
scriptstyle=2, scriptscriptstyle=3)
|
|
|
|
_binary_operators = set('''
|
|
+ * -
|
|
\\pm \\sqcap \\rhd
|
|
\\mp \\sqcup \\unlhd
|
|
\\times \\vee \\unrhd
|
|
\\div \\wedge \\oplus
|
|
\\ast \\setminus \\ominus
|
|
\\star \\wr \\otimes
|
|
\\circ \\diamond \\oslash
|
|
\\bullet \\bigtriangleup \\odot
|
|
\\cdot \\bigtriangledown \\bigcirc
|
|
\\cap \\triangleleft \\dagger
|
|
\\cup \\triangleright \\ddagger
|
|
\\uplus \\lhd \\amalg'''.split())
|
|
|
|
_relation_symbols = set('''
|
|
= < > :
|
|
\\leq \\geq \\equiv \\models
|
|
\\prec \\succ \\sim \\perp
|
|
\\preceq \\succeq \\simeq \\mid
|
|
\\ll \\gg \\asymp \\parallel
|
|
\\subset \\supset \\approx \\bowtie
|
|
\\subseteq \\supseteq \\cong \\Join
|
|
\\sqsubset \\sqsupset \\neq \\smile
|
|
\\sqsubseteq \\sqsupseteq \\doteq \\frown
|
|
\\in \\ni \\propto \\vdash
|
|
\\dashv \\dots \\dotplus \\doteqdot'''.split())
|
|
|
|
_arrow_symbols = set('''
|
|
\\leftarrow \\longleftarrow \\uparrow
|
|
\\Leftarrow \\Longleftarrow \\Uparrow
|
|
\\rightarrow \\longrightarrow \\downarrow
|
|
\\Rightarrow \\Longrightarrow \\Downarrow
|
|
\\leftrightarrow \\longleftrightarrow \\updownarrow
|
|
\\Leftrightarrow \\Longleftrightarrow \\Updownarrow
|
|
\\mapsto \\longmapsto \\nearrow
|
|
\\hookleftarrow \\hookrightarrow \\searrow
|
|
\\leftharpoonup \\rightharpoonup \\swarrow
|
|
\\leftharpoondown \\rightharpoondown \\nwarrow
|
|
\\rightleftharpoons \\leadsto'''.split())
|
|
|
|
_spaced_symbols = _binary_operators | _relation_symbols | _arrow_symbols
|
|
|
|
_punctuation_symbols = set(r', ; . ! \ldotp \cdotp'.split())
|
|
|
|
_overunder_symbols = set(r'''
|
|
\sum \prod \coprod \bigcap \bigcup \bigsqcup \bigvee
|
|
\bigwedge \bigodot \bigotimes \bigoplus \biguplus
|
|
'''.split())
|
|
|
|
_overunder_functions = set(
|
|
"lim liminf limsup sup max min".split())
|
|
|
|
_dropsub_symbols = set(r'''\int \oint'''.split())
|
|
|
|
_fontnames = set(
|
|
"rm cal it tt sf bf default bb frak circled scr regular".split())
|
|
|
|
_function_names = set("""
|
|
arccos csc ker min arcsin deg lg Pr arctan det lim sec arg dim
|
|
liminf sin cos exp limsup sinh cosh gcd ln sup cot hom log tan
|
|
coth inf max tanh""".split())
|
|
|
|
_ambi_delim = set("""
|
|
| \\| / \\backslash \\uparrow \\downarrow \\updownarrow \\Uparrow
|
|
\\Downarrow \\Updownarrow . \\vert \\Vert \\\\|""".split())
|
|
|
|
_left_delim = set(r"( [ \{ < \lfloor \langle \lceil".split())
|
|
|
|
_right_delim = set(r") ] \} > \rfloor \rangle \rceil".split())
|
|
|
|
def __init__(self):
|
|
p = types.SimpleNamespace()
|
|
# All forward declarations are here
|
|
p.accent = Forward()
|
|
p.ambi_delim = Forward()
|
|
p.apostrophe = Forward()
|
|
p.auto_delim = Forward()
|
|
p.binom = Forward()
|
|
p.bslash = Forward()
|
|
p.c_over_c = Forward()
|
|
p.customspace = Forward()
|
|
p.end_group = Forward()
|
|
p.float_literal = Forward()
|
|
p.font = Forward()
|
|
p.frac = Forward()
|
|
p.dfrac = Forward()
|
|
p.function = Forward()
|
|
p.genfrac = Forward()
|
|
p.group = Forward()
|
|
p.int_literal = Forward()
|
|
p.latexfont = Forward()
|
|
p.lbracket = Forward()
|
|
p.left_delim = Forward()
|
|
p.lbrace = Forward()
|
|
p.main = Forward()
|
|
p.math = Forward()
|
|
p.math_string = Forward()
|
|
p.non_math = Forward()
|
|
p.operatorname = Forward()
|
|
p.overline = Forward()
|
|
p.placeable = Forward()
|
|
p.rbrace = Forward()
|
|
p.rbracket = Forward()
|
|
p.required_group = Forward()
|
|
p.right_delim = Forward()
|
|
p.right_delim_safe = Forward()
|
|
p.simple = Forward()
|
|
p.simple_group = Forward()
|
|
p.single_symbol = Forward()
|
|
p.snowflake = Forward()
|
|
p.space = Forward()
|
|
p.sqrt = Forward()
|
|
p.stackrel = Forward()
|
|
p.start_group = Forward()
|
|
p.subsuper = Forward()
|
|
p.subsuperop = Forward()
|
|
p.symbol = Forward()
|
|
p.symbol_name = Forward()
|
|
p.token = Forward()
|
|
p.unknown_symbol = Forward()
|
|
|
|
# Set names on everything -- very useful for debugging
|
|
for key, val in vars(p).items():
|
|
if not key.startswith('_'):
|
|
val.setName(key)
|
|
|
|
p.float_literal <<= Regex(r"[-+]?([0-9]+\.?[0-9]*|\.[0-9]+)")
|
|
p.int_literal <<= Regex("[-+]?[0-9]+")
|
|
|
|
p.lbrace <<= Literal('{').suppress()
|
|
p.rbrace <<= Literal('}').suppress()
|
|
p.lbracket <<= Literal('[').suppress()
|
|
p.rbracket <<= Literal(']').suppress()
|
|
p.bslash <<= Literal('\\')
|
|
|
|
p.space <<= oneOf(list(self._space_widths))
|
|
p.customspace <<= (
|
|
Suppress(Literal(r'\hspace'))
|
|
- ((p.lbrace + p.float_literal + p.rbrace)
|
|
| Error(r"Expected \hspace{n}"))
|
|
)
|
|
|
|
unicode_range = "\U00000080-\U0001ffff"
|
|
p.single_symbol <<= Regex(
|
|
r"([a-zA-Z0-9 +\-*/<>=:,.;!\?&'@()\[\]|%s])|(\\[%%${}\[\]_|])" %
|
|
unicode_range)
|
|
p.snowflake <<= Suppress(p.bslash) + oneOf(self._snowflake)
|
|
p.symbol_name <<= (
|
|
Combine(p.bslash + oneOf(list(tex2uni)))
|
|
+ FollowedBy(Regex("[^A-Za-z]").leaveWhitespace() | StringEnd())
|
|
)
|
|
p.symbol <<= (p.single_symbol | p.symbol_name).leaveWhitespace()
|
|
|
|
p.apostrophe <<= Regex("'+")
|
|
|
|
p.c_over_c <<= (
|
|
Suppress(p.bslash)
|
|
+ oneOf(list(self._char_over_chars))
|
|
)
|
|
|
|
p.accent <<= Group(
|
|
Suppress(p.bslash)
|
|
+ oneOf([*self._accent_map, *self._wide_accents])
|
|
- p.placeable
|
|
)
|
|
|
|
p.function <<= (
|
|
Suppress(p.bslash)
|
|
+ oneOf(list(self._function_names))
|
|
)
|
|
|
|
p.start_group <<= Optional(p.latexfont) + p.lbrace
|
|
p.end_group <<= p.rbrace.copy()
|
|
p.simple_group <<= Group(p.lbrace + ZeroOrMore(p.token) + p.rbrace)
|
|
p.required_group <<= Group(p.lbrace + OneOrMore(p.token) + p.rbrace)
|
|
p.group <<= Group(
|
|
p.start_group + ZeroOrMore(p.token) + p.end_group
|
|
)
|
|
|
|
p.font <<= Suppress(p.bslash) + oneOf(list(self._fontnames))
|
|
p.latexfont <<= (
|
|
Suppress(p.bslash)
|
|
+ oneOf(['math' + x for x in self._fontnames])
|
|
)
|
|
|
|
p.frac <<= Group(
|
|
Suppress(Literal(r"\frac"))
|
|
- ((p.required_group + p.required_group)
|
|
| Error(r"Expected \frac{num}{den}"))
|
|
)
|
|
|
|
p.dfrac <<= Group(
|
|
Suppress(Literal(r"\dfrac"))
|
|
- ((p.required_group + p.required_group)
|
|
| Error(r"Expected \dfrac{num}{den}"))
|
|
)
|
|
|
|
p.stackrel <<= Group(
|
|
Suppress(Literal(r"\stackrel"))
|
|
- ((p.required_group + p.required_group)
|
|
| Error(r"Expected \stackrel{num}{den}"))
|
|
)
|
|
|
|
p.binom <<= Group(
|
|
Suppress(Literal(r"\binom"))
|
|
- ((p.required_group + p.required_group)
|
|
| Error(r"Expected \binom{num}{den}"))
|
|
)
|
|
|
|
p.ambi_delim <<= oneOf(list(self._ambi_delim))
|
|
p.left_delim <<= oneOf(list(self._left_delim))
|
|
p.right_delim <<= oneOf(list(self._right_delim))
|
|
p.right_delim_safe <<= oneOf([*(self._right_delim - {'}'}), r'\}'])
|
|
|
|
p.genfrac <<= Group(
|
|
Suppress(Literal(r"\genfrac"))
|
|
- (((p.lbrace
|
|
+ Optional(p.ambi_delim | p.left_delim, default='')
|
|
+ p.rbrace)
|
|
+ (p.lbrace
|
|
+ Optional(p.ambi_delim | p.right_delim_safe, default='')
|
|
+ p.rbrace)
|
|
+ (p.lbrace + p.float_literal + p.rbrace)
|
|
+ p.simple_group + p.required_group + p.required_group)
|
|
| Error("Expected "
|
|
r"\genfrac{ldelim}{rdelim}{rulesize}{style}{num}{den}"))
|
|
)
|
|
|
|
p.sqrt <<= Group(
|
|
Suppress(Literal(r"\sqrt"))
|
|
- ((Optional(p.lbracket + p.int_literal + p.rbracket, default=None)
|
|
+ p.required_group)
|
|
| Error("Expected \\sqrt{value}"))
|
|
)
|
|
|
|
p.overline <<= Group(
|
|
Suppress(Literal(r"\overline"))
|
|
- (p.required_group | Error("Expected \\overline{value}"))
|
|
)
|
|
|
|
p.unknown_symbol <<= Combine(p.bslash + Regex("[A-Za-z]*"))
|
|
|
|
p.operatorname <<= Group(
|
|
Suppress(Literal(r"\operatorname"))
|
|
- ((p.lbrace + ZeroOrMore(p.simple | p.unknown_symbol) + p.rbrace)
|
|
| Error("Expected \\operatorname{value}"))
|
|
)
|
|
|
|
p.placeable <<= (
|
|
p.snowflake # Must be before accent so named symbols that are
|
|
# prefixed with an accent name work
|
|
| p.accent # Must be before symbol as all accents are symbols
|
|
| p.symbol # Must be third to catch all named symbols and single
|
|
# chars not in a group
|
|
| p.c_over_c
|
|
| p.function
|
|
| p.group
|
|
| p.frac
|
|
| p.dfrac
|
|
| p.stackrel
|
|
| p.binom
|
|
| p.genfrac
|
|
| p.sqrt
|
|
| p.overline
|
|
| p.operatorname
|
|
)
|
|
|
|
p.simple <<= (
|
|
p.space
|
|
| p.customspace
|
|
| p.font
|
|
| p.subsuper
|
|
)
|
|
|
|
p.subsuperop <<= oneOf(["_", "^"])
|
|
|
|
p.subsuper <<= Group(
|
|
(Optional(p.placeable)
|
|
+ OneOrMore(p.subsuperop - p.placeable)
|
|
+ Optional(p.apostrophe))
|
|
| (p.placeable + Optional(p.apostrophe))
|
|
| p.apostrophe
|
|
)
|
|
|
|
p.token <<= (
|
|
p.simple
|
|
| p.auto_delim
|
|
| p.unknown_symbol # Must be last
|
|
)
|
|
|
|
p.auto_delim <<= (
|
|
Suppress(Literal(r"\left"))
|
|
- ((p.left_delim | p.ambi_delim)
|
|
| Error("Expected a delimiter"))
|
|
+ Group(ZeroOrMore(p.simple | p.auto_delim))
|
|
+ Suppress(Literal(r"\right"))
|
|
- ((p.right_delim | p.ambi_delim)
|
|
| Error("Expected a delimiter"))
|
|
)
|
|
|
|
p.math <<= OneOrMore(p.token)
|
|
|
|
p.math_string <<= QuotedString('$', '\\', unquoteResults=False)
|
|
|
|
p.non_math <<= Regex(r"(?:(?:\\[$])|[^$])*").leaveWhitespace()
|
|
|
|
p.main <<= (
|
|
p.non_math + ZeroOrMore(p.math_string + p.non_math) + StringEnd()
|
|
)
|
|
|
|
# Set actions
|
|
for key, val in vars(p).items():
|
|
if not key.startswith('_'):
|
|
if hasattr(self, key):
|
|
val.setParseAction(getattr(self, key))
|
|
|
|
self._expression = p.main
|
|
self._math_expression = p.math
|
|
|
|
def parse(self, s, fonts_object, fontsize, dpi):
|
|
"""
|
|
Parse expression *s* using the given *fonts_object* for
|
|
output, at the given *fontsize* and *dpi*.
|
|
|
|
Returns the parse tree of :class:`Node` instances.
|
|
"""
|
|
self._state_stack = [
|
|
self.State(fonts_object, 'default', 'rm', fontsize, dpi)]
|
|
self._em_width_cache = {}
|
|
try:
|
|
result = self._expression.parseString(s)
|
|
except ParseBaseException as err:
|
|
raise ValueError("\n".join(["",
|
|
err.line,
|
|
" " * (err.column - 1) + "^",
|
|
str(err)]))
|
|
self._state_stack = None
|
|
self._em_width_cache = {}
|
|
self._expression.resetCache()
|
|
return result[0]
|
|
|
|
# The state of the parser is maintained in a stack. Upon
|
|
# entering and leaving a group { } or math/non-math, the stack
|
|
# is pushed and popped accordingly. The current state always
|
|
# exists in the top element of the stack.
|
|
class State:
|
|
"""
|
|
Stores the state of the parser.
|
|
|
|
States are pushed and popped from a stack as necessary, and
|
|
the "current" state is always at the top of the stack.
|
|
"""
|
|
def __init__(self, font_output, font, font_class, fontsize, dpi):
|
|
self.font_output = font_output
|
|
self._font = font
|
|
self.font_class = font_class
|
|
self.fontsize = fontsize
|
|
self.dpi = dpi
|
|
|
|
def copy(self):
|
|
return Parser.State(
|
|
self.font_output,
|
|
self.font,
|
|
self.font_class,
|
|
self.fontsize,
|
|
self.dpi)
|
|
|
|
@property
|
|
def font(self):
|
|
return self._font
|
|
|
|
@font.setter
|
|
def font(self, name):
|
|
if name == "circled":
|
|
cbook.warn_deprecated(
|
|
"3.1", name="\\mathcircled", obj_type="mathtext command",
|
|
alternative="unicode characters (e.g. '\\N{CIRCLED LATIN "
|
|
"CAPITAL LETTER A}' or '\\u24b6')")
|
|
if name in ('rm', 'it', 'bf'):
|
|
self.font_class = name
|
|
self._font = name
|
|
|
|
def get_state(self):
|
|
"""
|
|
Get the current :class:`State` of the parser.
|
|
"""
|
|
return self._state_stack[-1]
|
|
|
|
def pop_state(self):
|
|
"""
|
|
Pop a :class:`State` off of the stack.
|
|
"""
|
|
self._state_stack.pop()
|
|
|
|
def push_state(self):
|
|
"""
|
|
Push a new :class:`State` onto the stack which is just a copy
|
|
of the current state.
|
|
"""
|
|
self._state_stack.append(self.get_state().copy())
|
|
|
|
def main(self, s, loc, toks):
|
|
return [Hlist(toks)]
|
|
|
|
def math_string(self, s, loc, toks):
|
|
return self._math_expression.parseString(toks[0][1:-1])
|
|
|
|
def math(self, s, loc, toks):
|
|
hlist = Hlist(toks)
|
|
self.pop_state()
|
|
return [hlist]
|
|
|
|
def non_math(self, s, loc, toks):
|
|
s = toks[0].replace(r'\$', '$')
|
|
symbols = [Char(c, self.get_state(), math=False) for c in s]
|
|
hlist = Hlist(symbols)
|
|
# We're going into math now, so set font to 'it'
|
|
self.push_state()
|
|
self.get_state().font = rcParams['mathtext.default']
|
|
return [hlist]
|
|
|
|
def _make_space(self, percentage):
|
|
# All spaces are relative to em width
|
|
state = self.get_state()
|
|
key = (state.font, state.fontsize, state.dpi)
|
|
width = self._em_width_cache.get(key)
|
|
if width is None:
|
|
metrics = state.font_output.get_metrics(
|
|
state.font, rcParams['mathtext.default'], 'm', state.fontsize,
|
|
state.dpi)
|
|
width = metrics.advance
|
|
self._em_width_cache[key] = width
|
|
return Kern(width * percentage)
|
|
|
|
_space_widths = {
|
|
r'\,': 0.16667, # 3/18 em = 3 mu
|
|
r'\thinspace': 0.16667, # 3/18 em = 3 mu
|
|
r'\/': 0.16667, # 3/18 em = 3 mu
|
|
r'\>': 0.22222, # 4/18 em = 4 mu
|
|
r'\:': 0.22222, # 4/18 em = 4 mu
|
|
r'\;': 0.27778, # 5/18 em = 5 mu
|
|
r'\ ': 0.33333, # 6/18 em = 6 mu
|
|
r'~': 0.33333, # 6/18 em = 6 mu, nonbreakable
|
|
r'\enspace': 0.5, # 9/18 em = 9 mu
|
|
r'\quad': 1, # 1 em = 18 mu
|
|
r'\qquad': 2, # 2 em = 36 mu
|
|
r'\!': -0.16667, # -3/18 em = -3 mu
|
|
}
|
|
|
|
def space(self, s, loc, toks):
|
|
assert len(toks) == 1
|
|
num = self._space_widths[toks[0]]
|
|
box = self._make_space(num)
|
|
return [box]
|
|
|
|
def customspace(self, s, loc, toks):
|
|
return [self._make_space(float(toks[0]))]
|
|
|
|
def symbol(self, s, loc, toks):
|
|
c = toks[0]
|
|
try:
|
|
char = Char(c, self.get_state())
|
|
except ValueError:
|
|
raise ParseFatalException(s, loc, "Unknown symbol: %s" % c)
|
|
|
|
if c in self._spaced_symbols:
|
|
# iterate until we find previous character, needed for cases
|
|
# such as ${ -2}$, $ -2$, or $ -2$.
|
|
prev_char = next((c for c in s[:loc][::-1] if c != ' '), '')
|
|
# Binary operators at start of string should not be spaced
|
|
if (c in self._binary_operators and
|
|
(len(s[:loc].split()) == 0 or prev_char == '{' or
|
|
prev_char in self._left_delim)):
|
|
return [char]
|
|
else:
|
|
return [Hlist([self._make_space(0.2),
|
|
char,
|
|
self._make_space(0.2)],
|
|
do_kern = True)]
|
|
elif c in self._punctuation_symbols:
|
|
|
|
# Do not space commas between brackets
|
|
if c == ',':
|
|
prev_char = next((c for c in s[:loc][::-1] if c != ' '), '')
|
|
next_char = next((c for c in s[loc + 1:] if c != ' '), '')
|
|
if prev_char == '{' and next_char == '}':
|
|
return [char]
|
|
|
|
# Do not space dots as decimal separators
|
|
if c == '.' and s[loc - 1].isdigit() and s[loc + 1].isdigit():
|
|
return [char]
|
|
else:
|
|
return [Hlist([char,
|
|
self._make_space(0.2)],
|
|
do_kern = True)]
|
|
return [char]
|
|
|
|
snowflake = symbol
|
|
|
|
def unknown_symbol(self, s, loc, toks):
|
|
c = toks[0]
|
|
raise ParseFatalException(s, loc, "Unknown symbol: %s" % c)
|
|
|
|
_char_over_chars = {
|
|
# The first 2 entries in the tuple are (font, char, sizescale) for
|
|
# the two symbols under and over. The third element is the space
|
|
# (in multiples of underline height)
|
|
r'AA': (('it', 'A', 1.0), (None, '\\circ', 0.5), 0.0),
|
|
}
|
|
|
|
def c_over_c(self, s, loc, toks):
|
|
sym = toks[0]
|
|
state = self.get_state()
|
|
thickness = state.font_output.get_underline_thickness(
|
|
state.font, state.fontsize, state.dpi)
|
|
|
|
under_desc, over_desc, space = \
|
|
self._char_over_chars.get(sym, (None, None, 0.0))
|
|
if under_desc is None:
|
|
raise ParseFatalException("Error parsing symbol")
|
|
|
|
over_state = state.copy()
|
|
if over_desc[0] is not None:
|
|
over_state.font = over_desc[0]
|
|
over_state.fontsize *= over_desc[2]
|
|
over = Accent(over_desc[1], over_state)
|
|
|
|
under_state = state.copy()
|
|
if under_desc[0] is not None:
|
|
under_state.font = under_desc[0]
|
|
under_state.fontsize *= under_desc[2]
|
|
under = Char(under_desc[1], under_state)
|
|
|
|
width = max(over.width, under.width)
|
|
|
|
over_centered = HCentered([over])
|
|
over_centered.hpack(width, 'exactly')
|
|
|
|
under_centered = HCentered([under])
|
|
under_centered.hpack(width, 'exactly')
|
|
|
|
return Vlist([
|
|
over_centered,
|
|
Vbox(0., thickness * space),
|
|
under_centered
|
|
])
|
|
|
|
_accent_map = {
|
|
r'hat': r'\circumflexaccent',
|
|
r'breve': r'\combiningbreve',
|
|
r'bar': r'\combiningoverline',
|
|
r'grave': r'\combininggraveaccent',
|
|
r'acute': r'\combiningacuteaccent',
|
|
r'tilde': r'\combiningtilde',
|
|
r'dot': r'\combiningdotabove',
|
|
r'ddot': r'\combiningdiaeresis',
|
|
r'vec': r'\combiningrightarrowabove',
|
|
r'"': r'\combiningdiaeresis',
|
|
r"`": r'\combininggraveaccent',
|
|
r"'": r'\combiningacuteaccent',
|
|
r'~': r'\combiningtilde',
|
|
r'.': r'\combiningdotabove',
|
|
r'^': r'\circumflexaccent',
|
|
r'overrightarrow': r'\rightarrow',
|
|
r'overleftarrow': r'\leftarrow',
|
|
r'mathring': r'\circ',
|
|
}
|
|
|
|
_wide_accents = set(r"widehat widetilde widebar".split())
|
|
|
|
# make a lambda and call it to get the namespace right
|
|
_snowflake = (lambda am: [p for p in tex2uni if
|
|
any(p.startswith(a) and a != p for a in am)])(
|
|
set(_accent_map))
|
|
|
|
def accent(self, s, loc, toks):
|
|
assert len(toks) == 1
|
|
state = self.get_state()
|
|
thickness = state.font_output.get_underline_thickness(
|
|
state.font, state.fontsize, state.dpi)
|
|
if len(toks[0]) != 2:
|
|
raise ParseFatalException("Error parsing accent")
|
|
accent, sym = toks[0]
|
|
if accent in self._wide_accents:
|
|
accent_box = AutoWidthChar(
|
|
'\\' + accent, sym.width, state, char_class=Accent)
|
|
else:
|
|
accent_box = Accent(self._accent_map[accent], state)
|
|
if accent == 'mathring':
|
|
accent_box.shrink()
|
|
accent_box.shrink()
|
|
centered = HCentered([Hbox(sym.width / 4.0), accent_box])
|
|
centered.hpack(sym.width, 'exactly')
|
|
return Vlist([
|
|
centered,
|
|
Vbox(0., thickness * 2.0),
|
|
Hlist([sym])
|
|
])
|
|
|
|
def function(self, s, loc, toks):
|
|
self.push_state()
|
|
state = self.get_state()
|
|
state.font = 'rm'
|
|
hlist = Hlist([Char(c, state) for c in toks[0]])
|
|
self.pop_state()
|
|
hlist.function_name = toks[0]
|
|
return hlist
|
|
|
|
def operatorname(self, s, loc, toks):
|
|
self.push_state()
|
|
state = self.get_state()
|
|
state.font = 'rm'
|
|
# Change the font of Chars, but leave Kerns alone
|
|
for c in toks[0]:
|
|
if isinstance(c, Char):
|
|
c.font = 'rm'
|
|
c._update_metrics()
|
|
self.pop_state()
|
|
return Hlist(toks[0])
|
|
|
|
def start_group(self, s, loc, toks):
|
|
self.push_state()
|
|
# Deal with LaTeX-style font tokens
|
|
if len(toks):
|
|
self.get_state().font = toks[0][4:]
|
|
return []
|
|
|
|
def group(self, s, loc, toks):
|
|
grp = Hlist(toks[0])
|
|
return [grp]
|
|
required_group = simple_group = group
|
|
|
|
def end_group(self, s, loc, toks):
|
|
self.pop_state()
|
|
return []
|
|
|
|
def font(self, s, loc, toks):
|
|
assert len(toks) == 1
|
|
name = toks[0]
|
|
self.get_state().font = name
|
|
return []
|
|
|
|
def is_overunder(self, nucleus):
|
|
if isinstance(nucleus, Char):
|
|
return nucleus.c in self._overunder_symbols
|
|
elif isinstance(nucleus, Hlist) and hasattr(nucleus, 'function_name'):
|
|
return nucleus.function_name in self._overunder_functions
|
|
return False
|
|
|
|
def is_dropsub(self, nucleus):
|
|
if isinstance(nucleus, Char):
|
|
return nucleus.c in self._dropsub_symbols
|
|
return False
|
|
|
|
def is_slanted(self, nucleus):
|
|
if isinstance(nucleus, Char):
|
|
return nucleus.is_slanted()
|
|
return False
|
|
|
|
def is_between_brackets(self, s, loc):
|
|
return False
|
|
|
|
def subsuper(self, s, loc, toks):
|
|
assert len(toks) == 1
|
|
|
|
nucleus = None
|
|
sub = None
|
|
super = None
|
|
|
|
# Pick all of the apostrophes out, including first apostrophes that
|
|
# have been parsed as characters
|
|
napostrophes = 0
|
|
new_toks = []
|
|
for tok in toks[0]:
|
|
if isinstance(tok, str) and tok not in ('^', '_'):
|
|
napostrophes += len(tok)
|
|
elif isinstance(tok, Char) and tok.c == "'":
|
|
napostrophes += 1
|
|
else:
|
|
new_toks.append(tok)
|
|
toks = new_toks
|
|
|
|
if len(toks) == 0:
|
|
assert napostrophes
|
|
nucleus = Hbox(0.0)
|
|
elif len(toks) == 1:
|
|
if not napostrophes:
|
|
return toks[0] # .asList()
|
|
else:
|
|
nucleus = toks[0]
|
|
elif len(toks) in (2, 3):
|
|
# single subscript or superscript
|
|
nucleus = toks[0] if len(toks) == 3 else Hbox(0.0)
|
|
op, next = toks[-2:]
|
|
if op == '_':
|
|
sub = next
|
|
else:
|
|
super = next
|
|
elif len(toks) in (4, 5):
|
|
# subscript and superscript
|
|
nucleus = toks[0] if len(toks) == 5 else Hbox(0.0)
|
|
op1, next1, op2, next2 = toks[-4:]
|
|
if op1 == op2:
|
|
if op1 == '_':
|
|
raise ParseFatalException("Double subscript")
|
|
else:
|
|
raise ParseFatalException("Double superscript")
|
|
if op1 == '_':
|
|
sub = next1
|
|
super = next2
|
|
else:
|
|
super = next1
|
|
sub = next2
|
|
else:
|
|
raise ParseFatalException(
|
|
"Subscript/superscript sequence is too long. "
|
|
"Use braces { } to remove ambiguity.")
|
|
|
|
state = self.get_state()
|
|
rule_thickness = state.font_output.get_underline_thickness(
|
|
state.font, state.fontsize, state.dpi)
|
|
xHeight = state.font_output.get_xheight(
|
|
state.font, state.fontsize, state.dpi)
|
|
|
|
if napostrophes:
|
|
if super is None:
|
|
super = Hlist([])
|
|
for i in range(napostrophes):
|
|
super.children.extend(self.symbol(s, loc, ['\\prime']))
|
|
# kern() and hpack() needed to get the metrics right after
|
|
# extending
|
|
super.kern()
|
|
super.hpack()
|
|
|
|
# Handle over/under symbols, such as sum or integral
|
|
if self.is_overunder(nucleus):
|
|
vlist = []
|
|
shift = 0.
|
|
width = nucleus.width
|
|
if super is not None:
|
|
super.shrink()
|
|
width = max(width, super.width)
|
|
if sub is not None:
|
|
sub.shrink()
|
|
width = max(width, sub.width)
|
|
|
|
if super is not None:
|
|
hlist = HCentered([super])
|
|
hlist.hpack(width, 'exactly')
|
|
vlist.extend([hlist, Kern(rule_thickness * 3.0)])
|
|
hlist = HCentered([nucleus])
|
|
hlist.hpack(width, 'exactly')
|
|
vlist.append(hlist)
|
|
if sub is not None:
|
|
hlist = HCentered([sub])
|
|
hlist.hpack(width, 'exactly')
|
|
vlist.extend([Kern(rule_thickness * 3.0), hlist])
|
|
shift = hlist.height
|
|
vlist = Vlist(vlist)
|
|
vlist.shift_amount = shift + nucleus.depth
|
|
result = Hlist([vlist])
|
|
return [result]
|
|
|
|
# We remove kerning on the last character for consistency (otherwise
|
|
# it will compute kerning based on non-shrunk characters and may put
|
|
# them too close together when superscripted)
|
|
# We change the width of the last character to match the advance to
|
|
# consider some fonts with weird metrics: e.g. stix's f has a width of
|
|
# 7.75 and a kerning of -4.0 for an advance of 3.72, and we want to put
|
|
# the superscript at the advance
|
|
last_char = nucleus
|
|
if isinstance(nucleus, Hlist):
|
|
new_children = nucleus.children
|
|
if len(new_children):
|
|
# remove last kern
|
|
if (isinstance(new_children[-1], Kern) and
|
|
hasattr(new_children[-2], '_metrics')):
|
|
new_children = new_children[:-1]
|
|
last_char = new_children[-1]
|
|
if hasattr(last_char, '_metrics'):
|
|
last_char.width = last_char._metrics.advance
|
|
# create new Hlist without kerning
|
|
nucleus = Hlist(new_children, do_kern=False)
|
|
else:
|
|
if isinstance(nucleus, Char):
|
|
last_char.width = last_char._metrics.advance
|
|
nucleus = Hlist([nucleus])
|
|
|
|
# Handle regular sub/superscripts
|
|
constants = _get_font_constant_set(state)
|
|
lc_height = last_char.height
|
|
lc_baseline = 0
|
|
if self.is_dropsub(last_char):
|
|
lc_baseline = last_char.depth
|
|
|
|
# Compute kerning for sub and super
|
|
superkern = constants.delta * xHeight
|
|
subkern = constants.delta * xHeight
|
|
if self.is_slanted(last_char):
|
|
superkern += constants.delta * xHeight
|
|
superkern += (constants.delta_slanted *
|
|
(lc_height - xHeight * 2. / 3.))
|
|
if self.is_dropsub(last_char):
|
|
subkern = (3 * constants.delta -
|
|
constants.delta_integral) * lc_height
|
|
superkern = (3 * constants.delta +
|
|
constants.delta_integral) * lc_height
|
|
else:
|
|
subkern = 0
|
|
|
|
if super is None:
|
|
# node757
|
|
x = Hlist([Kern(subkern), sub])
|
|
x.shrink()
|
|
if self.is_dropsub(last_char):
|
|
shift_down = lc_baseline + constants.subdrop * xHeight
|
|
else:
|
|
shift_down = constants.sub1 * xHeight
|
|
x.shift_amount = shift_down
|
|
else:
|
|
x = Hlist([Kern(superkern), super])
|
|
x.shrink()
|
|
if self.is_dropsub(last_char):
|
|
shift_up = lc_height - constants.subdrop * xHeight
|
|
else:
|
|
shift_up = constants.sup1 * xHeight
|
|
if sub is None:
|
|
x.shift_amount = -shift_up
|
|
else: # Both sub and superscript
|
|
y = Hlist([Kern(subkern), sub])
|
|
y.shrink()
|
|
if self.is_dropsub(last_char):
|
|
shift_down = lc_baseline + constants.subdrop * xHeight
|
|
else:
|
|
shift_down = constants.sub2 * xHeight
|
|
# If sub and superscript collide, move super up
|
|
clr = (2.0 * rule_thickness -
|
|
((shift_up - x.depth) - (y.height - shift_down)))
|
|
if clr > 0.:
|
|
shift_up += clr
|
|
x = Vlist([
|
|
x,
|
|
Kern((shift_up - x.depth) - (y.height - shift_down)),
|
|
y])
|
|
x.shift_amount = shift_down
|
|
|
|
if not self.is_dropsub(last_char):
|
|
x.width += constants.script_space * xHeight
|
|
result = Hlist([nucleus, x])
|
|
|
|
return [result]
|
|
|
|
def _genfrac(self, ldelim, rdelim, rule, style, num, den):
|
|
state = self.get_state()
|
|
thickness = state.font_output.get_underline_thickness(
|
|
state.font, state.fontsize, state.dpi)
|
|
|
|
rule = float(rule)
|
|
|
|
# If style != displaystyle == 0, shrink the num and den
|
|
if style != self._math_style_dict['displaystyle']:
|
|
num.shrink()
|
|
den.shrink()
|
|
cnum = HCentered([num])
|
|
cden = HCentered([den])
|
|
width = max(num.width, den.width)
|
|
cnum.hpack(width, 'exactly')
|
|
cden.hpack(width, 'exactly')
|
|
vlist = Vlist([cnum, # numerator
|
|
Vbox(0, thickness * 2.0), # space
|
|
Hrule(state, rule), # rule
|
|
Vbox(0, thickness * 2.0), # space
|
|
cden # denominator
|
|
])
|
|
|
|
# Shift so the fraction line sits in the middle of the
|
|
# equals sign
|
|
metrics = state.font_output.get_metrics(
|
|
state.font, rcParams['mathtext.default'],
|
|
'=', state.fontsize, state.dpi)
|
|
shift = (cden.height -
|
|
((metrics.ymax + metrics.ymin) / 2 -
|
|
thickness * 3.0))
|
|
vlist.shift_amount = shift
|
|
|
|
result = [Hlist([vlist, Hbox(thickness * 2.)])]
|
|
if ldelim or rdelim:
|
|
if ldelim == '':
|
|
ldelim = '.'
|
|
if rdelim == '':
|
|
rdelim = '.'
|
|
return self._auto_sized_delimiter(ldelim, result, rdelim)
|
|
return result
|
|
|
|
def genfrac(self, s, loc, toks):
|
|
assert len(toks) == 1
|
|
assert len(toks[0]) == 6
|
|
|
|
return self._genfrac(*tuple(toks[0]))
|
|
|
|
def frac(self, s, loc, toks):
|
|
assert len(toks) == 1
|
|
assert len(toks[0]) == 2
|
|
state = self.get_state()
|
|
|
|
thickness = state.font_output.get_underline_thickness(
|
|
state.font, state.fontsize, state.dpi)
|
|
num, den = toks[0]
|
|
|
|
return self._genfrac('', '', thickness,
|
|
self._math_style_dict['textstyle'], num, den)
|
|
|
|
def dfrac(self, s, loc, toks):
|
|
assert len(toks) == 1
|
|
assert len(toks[0]) == 2
|
|
state = self.get_state()
|
|
|
|
thickness = state.font_output.get_underline_thickness(
|
|
state.font, state.fontsize, state.dpi)
|
|
num, den = toks[0]
|
|
|
|
return self._genfrac('', '', thickness,
|
|
self._math_style_dict['displaystyle'], num, den)
|
|
|
|
@cbook.deprecated("3.1", obj_type="mathtext command",
|
|
alternative=r"\genfrac")
|
|
def stackrel(self, s, loc, toks):
|
|
assert len(toks) == 1
|
|
assert len(toks[0]) == 2
|
|
num, den = toks[0]
|
|
|
|
return self._genfrac('', '', 0.0,
|
|
self._math_style_dict['textstyle'], num, den)
|
|
|
|
def binom(self, s, loc, toks):
|
|
assert len(toks) == 1
|
|
assert len(toks[0]) == 2
|
|
num, den = toks[0]
|
|
|
|
return self._genfrac('(', ')', 0.0,
|
|
self._math_style_dict['textstyle'], num, den)
|
|
|
|
def sqrt(self, s, loc, toks):
|
|
root, body = toks[0]
|
|
state = self.get_state()
|
|
thickness = state.font_output.get_underline_thickness(
|
|
state.font, state.fontsize, state.dpi)
|
|
|
|
# Determine the height of the body, and add a little extra to
|
|
# the height so it doesn't seem cramped
|
|
height = body.height - body.shift_amount + thickness * 5.0
|
|
depth = body.depth + body.shift_amount
|
|
check = AutoHeightChar(r'\__sqrt__', height, depth, state, always=True)
|
|
height = check.height - check.shift_amount
|
|
depth = check.depth + check.shift_amount
|
|
|
|
# Put a little extra space to the left and right of the body
|
|
padded_body = Hlist([Hbox(thickness * 2.0),
|
|
body,
|
|
Hbox(thickness * 2.0)])
|
|
rightside = Vlist([Hrule(state),
|
|
Fill(),
|
|
padded_body])
|
|
# Stretch the glue between the hrule and the body
|
|
rightside.vpack(height + (state.fontsize * state.dpi) / (100.0 * 12.0),
|
|
'exactly', depth)
|
|
|
|
# Add the root and shift it upward so it is above the tick.
|
|
# The value of 0.6 is a hard-coded hack ;)
|
|
if root is None:
|
|
root = Box(check.width * 0.5, 0., 0.)
|
|
else:
|
|
root = Hlist([Char(x, state) for x in root])
|
|
root.shrink()
|
|
root.shrink()
|
|
|
|
root_vlist = Vlist([Hlist([root])])
|
|
root_vlist.shift_amount = -height * 0.6
|
|
|
|
hlist = Hlist([root_vlist, # Root
|
|
# Negative kerning to put root over tick
|
|
Kern(-check.width * 0.5),
|
|
check, # Check
|
|
rightside]) # Body
|
|
return [hlist]
|
|
|
|
def overline(self, s, loc, toks):
|
|
assert len(toks) == 1
|
|
assert len(toks[0]) == 1
|
|
|
|
body = toks[0][0]
|
|
|
|
state = self.get_state()
|
|
thickness = state.font_output.get_underline_thickness(
|
|
state.font, state.fontsize, state.dpi)
|
|
|
|
height = body.height - body.shift_amount + thickness * 3.0
|
|
depth = body.depth + body.shift_amount
|
|
|
|
# Place overline above body
|
|
rightside = Vlist([Hrule(state),
|
|
Fill(),
|
|
Hlist([body])])
|
|
|
|
# Stretch the glue between the hrule and the body
|
|
rightside.vpack(height + (state.fontsize * state.dpi) / (100.0 * 12.0),
|
|
'exactly', depth)
|
|
|
|
hlist = Hlist([rightside])
|
|
return [hlist]
|
|
|
|
def _auto_sized_delimiter(self, front, middle, back):
|
|
state = self.get_state()
|
|
if len(middle):
|
|
height = max(x.height for x in middle)
|
|
depth = max(x.depth for x in middle)
|
|
factor = None
|
|
else:
|
|
height = 0
|
|
depth = 0
|
|
factor = 1.0
|
|
parts = []
|
|
# \left. and \right. aren't supposed to produce any symbols
|
|
if front != '.':
|
|
parts.append(
|
|
AutoHeightChar(front, height, depth, state, factor=factor))
|
|
parts.extend(middle)
|
|
if back != '.':
|
|
parts.append(
|
|
AutoHeightChar(back, height, depth, state, factor=factor))
|
|
hlist = Hlist(parts)
|
|
return hlist
|
|
|
|
def auto_delim(self, s, loc, toks):
|
|
front, middle, back = toks
|
|
|
|
return self._auto_sized_delimiter(front, middle.asList(), back)
|
|
|
|
|
|
##############################################################################
|
|
# MAIN
|
|
|
|
|
|
class MathTextParser:
|
|
_parser = None
|
|
|
|
_backend_mapping = {
|
|
'bitmap': MathtextBackendBitmap,
|
|
'agg': MathtextBackendAgg,
|
|
'ps': MathtextBackendPs,
|
|
'pdf': MathtextBackendPdf,
|
|
'svg': MathtextBackendSvg,
|
|
'path': MathtextBackendPath,
|
|
'cairo': MathtextBackendCairo,
|
|
'macosx': MathtextBackendAgg,
|
|
}
|
|
_font_type_mapping = {
|
|
'cm': BakomaFonts,
|
|
'dejavuserif': DejaVuSerifFonts,
|
|
'dejavusans': DejaVuSansFonts,
|
|
'stix': StixFonts,
|
|
'stixsans': StixSansFonts,
|
|
'custom': UnicodeFonts,
|
|
}
|
|
|
|
def __init__(self, output):
|
|
"""
|
|
Create a MathTextParser for the given backend *output*.
|
|
"""
|
|
self._output = output.lower()
|
|
|
|
@functools.lru_cache(50)
|
|
def parse(self, s, dpi = 72, prop = None):
|
|
"""
|
|
Parse the given math expression *s* at the given *dpi*. If
|
|
*prop* is provided, it is a
|
|
:class:`~matplotlib.font_manager.FontProperties` object
|
|
specifying the "default" font to use in the math expression,
|
|
used for all non-math text.
|
|
|
|
The results are cached, so multiple calls to :meth:`parse`
|
|
with the same expression should be fast.
|
|
"""
|
|
|
|
if prop is None:
|
|
prop = FontProperties()
|
|
|
|
if self._output == 'ps' and rcParams['ps.useafm']:
|
|
font_output = StandardPsFonts(prop)
|
|
else:
|
|
backend = self._backend_mapping[self._output]()
|
|
fontset = rcParams['mathtext.fontset'].lower()
|
|
fontset_class = cbook._check_getitem(
|
|
self._font_type_mapping, fontset=fontset)
|
|
font_output = fontset_class(prop, backend)
|
|
|
|
fontsize = prop.get_size_in_points()
|
|
|
|
# This is a class variable so we don't rebuild the parser
|
|
# with each request.
|
|
if self._parser is None:
|
|
self.__class__._parser = Parser()
|
|
|
|
box = self._parser.parse(s, font_output, fontsize, dpi)
|
|
font_output.set_canvas_size(box.width, box.height, box.depth)
|
|
return font_output.get_results(box)
|
|
|
|
def to_mask(self, texstr, dpi=120, fontsize=14):
|
|
r"""
|
|
Parameters
|
|
----------
|
|
texstr : str
|
|
A valid mathtext string, e.g., r'IQ: $\sigma_i=15$'.
|
|
dpi : float
|
|
The dots-per-inch setting used to render the text.
|
|
fontsize : int
|
|
The font size in points
|
|
|
|
Returns
|
|
-------
|
|
array : 2D uint8 alpha
|
|
Mask array of rasterized tex.
|
|
depth : int
|
|
Offset of the baseline from the bottom of the image, in pixels.
|
|
"""
|
|
assert self._output == "bitmap"
|
|
prop = FontProperties(size=fontsize)
|
|
ftimage, depth = self.parse(texstr, dpi=dpi, prop=prop)
|
|
return np.asarray(ftimage), depth
|
|
|
|
def to_rgba(self, texstr, color='black', dpi=120, fontsize=14):
|
|
r"""
|
|
Parameters
|
|
----------
|
|
texstr : str
|
|
A valid mathtext string, e.g., r'IQ: $\sigma_i=15$'.
|
|
color : color
|
|
The text color.
|
|
dpi : float
|
|
The dots-per-inch setting used to render the text.
|
|
fontsize : int
|
|
The font size in points.
|
|
|
|
Returns
|
|
-------
|
|
array : (M, N, 4) array
|
|
RGBA color values of rasterized tex, colorized with *color*.
|
|
depth : int
|
|
Offset of the baseline from the bottom of the image, in pixels.
|
|
"""
|
|
x, depth = self.to_mask(texstr, dpi=dpi, fontsize=fontsize)
|
|
|
|
r, g, b, a = mcolors.to_rgba(color)
|
|
RGBA = np.zeros((x.shape[0], x.shape[1], 4), dtype=np.uint8)
|
|
RGBA[:, :, 0] = 255 * r
|
|
RGBA[:, :, 1] = 255 * g
|
|
RGBA[:, :, 2] = 255 * b
|
|
RGBA[:, :, 3] = x
|
|
return RGBA, depth
|
|
|
|
def to_png(self, filename, texstr, color='black', dpi=120, fontsize=14):
|
|
r"""
|
|
Render a tex expression to a PNG file.
|
|
|
|
Parameters
|
|
----------
|
|
filename
|
|
A writable filename or fileobject.
|
|
texstr : str
|
|
A valid mathtext string, e.g., r'IQ: $\sigma_i=15$'.
|
|
color : color
|
|
The text color.
|
|
dpi : float
|
|
The dots-per-inch setting used to render the text.
|
|
fontsize : int
|
|
The font size in points.
|
|
|
|
Returns
|
|
-------
|
|
depth : int
|
|
Offset of the baseline from the bottom of the image, in pixels.
|
|
"""
|
|
from matplotlib import _png
|
|
rgba, depth = self.to_rgba(
|
|
texstr, color=color, dpi=dpi, fontsize=fontsize)
|
|
with cbook.open_file_cm(filename, "wb") as file:
|
|
_png.write_png(rgba, file)
|
|
return depth
|
|
|
|
def get_depth(self, texstr, dpi=120, fontsize=14):
|
|
r"""
|
|
Parameters
|
|
----------
|
|
texstr : str
|
|
A valid mathtext string, e.g., r'IQ: $\sigma_i=15$'.
|
|
dpi : float
|
|
The dots-per-inch setting used to render the text.
|
|
|
|
Returns
|
|
-------
|
|
depth : int
|
|
Offset of the baseline from the bottom of the image, in pixels.
|
|
"""
|
|
assert self._output == "bitmap"
|
|
prop = FontProperties(size=fontsize)
|
|
ftimage, depth = self.parse(texstr, dpi=dpi, prop=prop)
|
|
return depth
|
|
|
|
|
|
def math_to_image(s, filename_or_obj, prop=None, dpi=None, format=None):
|
|
"""
|
|
Given a math expression, renders it in a closely-clipped bounding
|
|
box to an image file.
|
|
|
|
*s*
|
|
A math expression. The math portion should be enclosed in
|
|
dollar signs.
|
|
|
|
*filename_or_obj*
|
|
A filepath or writable file-like object to write the image data
|
|
to.
|
|
|
|
*prop*
|
|
If provided, a FontProperties() object describing the size and
|
|
style of the text.
|
|
|
|
*dpi*
|
|
Override the output dpi, otherwise use the default associated
|
|
with the output format.
|
|
|
|
*format*
|
|
The output format, e.g., 'svg', 'pdf', 'ps' or 'png'. If not
|
|
provided, will be deduced from the filename.
|
|
"""
|
|
from matplotlib import figure
|
|
# backend_agg supports all of the core output formats
|
|
from matplotlib.backends import backend_agg
|
|
|
|
if prop is None:
|
|
prop = FontProperties()
|
|
|
|
parser = MathTextParser('path')
|
|
width, height, depth, _, _ = parser.parse(s, dpi=72, prop=prop)
|
|
|
|
fig = figure.Figure(figsize=(width / 72.0, height / 72.0))
|
|
fig.text(0, depth/height, s, fontproperties=prop)
|
|
backend_agg.FigureCanvasAgg(fig)
|
|
fig.savefig(filename_or_obj, dpi=dpi, format=format)
|
|
|
|
return depth
|