743 lines
22 KiB
Python
743 lines
22 KiB
Python
from sortedcontainers import SortedListWithKey
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from .utils import INF
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from .utils import Plane
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from .utils import get_bound
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from .utils import uniq
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from .utils import fsplit
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from .utils import bbox2str
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from .utils import matrix2str
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from .utils import apply_matrix_pt
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import six # Python 2+3 compatibility
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## IndexAssigner
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##
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class IndexAssigner(object):
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def __init__(self, index=0):
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self.index = index
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return
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def run(self, obj):
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if isinstance(obj, LTTextBox):
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obj.index = self.index
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self.index += 1
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elif isinstance(obj, LTTextGroup):
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for x in obj:
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self.run(x)
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return
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## LAParams
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##
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class LAParams(object):
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def __init__(self,
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line_overlap=0.5,
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char_margin=2.0,
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line_margin=0.5,
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word_margin=0.1,
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boxes_flow=0.5,
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detect_vertical=False,
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all_texts=False):
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self.line_overlap = line_overlap
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self.char_margin = char_margin
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self.line_margin = line_margin
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self.word_margin = word_margin
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self.boxes_flow = boxes_flow
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self.detect_vertical = detect_vertical
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self.all_texts = all_texts
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return
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def __repr__(self):
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return ('<LAParams: char_margin=%.1f, line_margin=%.1f, word_margin=%.1f all_texts=%r>' %
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(self.char_margin, self.line_margin, self.word_margin, self.all_texts))
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## LTItem
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##
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class LTItem(object):
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def analyze(self, laparams):
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"""Perform the layout analysis."""
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return
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## LTText
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##
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class LTText(object):
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def __repr__(self):
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return ('<%s %r>' %
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(self.__class__.__name__, self.get_text()))
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def get_text(self):
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raise NotImplementedError
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## LTComponent
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##
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class LTComponent(LTItem):
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def __init__(self, bbox):
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LTItem.__init__(self)
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self.set_bbox(bbox)
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return
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def __repr__(self):
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return ('<%s %s>' %
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(self.__class__.__name__, bbox2str(self.bbox)))
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# Disable comparison.
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def __lt__(self, _):
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raise ValueError
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def __le__(self, _):
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raise ValueError
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def __gt__(self, _):
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raise ValueError
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def __ge__(self, _):
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raise ValueError
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def set_bbox(self, bbox):
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(x0, y0, x1, y1) = bbox
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self.x0 = x0
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self.y0 = y0
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self.x1 = x1
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self.y1 = y1
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self.width = x1-x0
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self.height = y1-y0
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self.bbox = bbox
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return
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def is_empty(self):
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return self.width <= 0 or self.height <= 0
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def is_hoverlap(self, obj):
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assert isinstance(obj, LTComponent), str(type(obj))
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return obj.x0 <= self.x1 and self.x0 <= obj.x1
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def hdistance(self, obj):
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assert isinstance(obj, LTComponent), str(type(obj))
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if self.is_hoverlap(obj):
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return 0
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else:
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return min(abs(self.x0-obj.x1), abs(self.x1-obj.x0))
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def hoverlap(self, obj):
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assert isinstance(obj, LTComponent), str(type(obj))
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if self.is_hoverlap(obj):
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return min(abs(self.x0-obj.x1), abs(self.x1-obj.x0))
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else:
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return 0
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def is_voverlap(self, obj):
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assert isinstance(obj, LTComponent), str(type(obj))
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return obj.y0 <= self.y1 and self.y0 <= obj.y1
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def vdistance(self, obj):
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assert isinstance(obj, LTComponent), str(type(obj))
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if self.is_voverlap(obj):
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return 0
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else:
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return min(abs(self.y0-obj.y1), abs(self.y1-obj.y0))
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def voverlap(self, obj):
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assert isinstance(obj, LTComponent), str(type(obj))
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if self.is_voverlap(obj):
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return min(abs(self.y0-obj.y1), abs(self.y1-obj.y0))
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else:
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return 0
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## LTCurve
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##
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class LTCurve(LTComponent):
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def __init__(self, linewidth, pts, stroke = False, fill = False, evenodd = False, stroking_color = None, non_stroking_color = None):
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LTComponent.__init__(self, get_bound(pts))
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self.pts = pts
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self.linewidth = linewidth
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self.stroke = stroke
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self.fill = fill
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self.evenodd = evenodd
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self.stroking_color = stroking_color
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self.non_stroking_color = non_stroking_color
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return
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def get_pts(self):
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return ','.join('%.3f,%.3f' % p for p in self.pts)
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## LTLine
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##
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class LTLine(LTCurve):
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def __init__(self, linewidth, p0, p1, stroke = False, fill = False, evenodd = False, stroking_color = None, non_stroking_color = None):
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LTCurve.__init__(self, linewidth, [p0, p1], stroke, fill, evenodd, stroking_color, non_stroking_color)
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return
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## LTRect
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##
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class LTRect(LTCurve):
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def __init__(self, linewidth, bbox, stroke = False, fill = False, evenodd = False, stroking_color = None, non_stroking_color = None):
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(x0, y0, x1, y1) = bbox
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LTCurve.__init__(self, linewidth, [(x0, y0), (x1, y0), (x1, y1), (x0, y1)], stroke, fill, evenodd, stroking_color, non_stroking_color)
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return
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## LTImage
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##
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class LTImage(LTComponent):
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def __init__(self, name, stream, bbox):
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LTComponent.__init__(self, bbox)
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self.name = name
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self.stream = stream
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self.srcsize = (stream.get_any(('W', 'Width')),
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stream.get_any(('H', 'Height')))
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self.imagemask = stream.get_any(('IM', 'ImageMask'))
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self.bits = stream.get_any(('BPC', 'BitsPerComponent'), 1)
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self.colorspace = stream.get_any(('CS', 'ColorSpace'))
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if not isinstance(self.colorspace, list):
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self.colorspace = [self.colorspace]
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return
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def __repr__(self):
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return ('<%s(%s) %s %r>' %
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(self.__class__.__name__, self.name,
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bbox2str(self.bbox), self.srcsize))
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## LTAnno
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##
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class LTAnno(LTItem, LTText):
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def __init__(self, text):
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self._text = text
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return
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def get_text(self):
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return self._text
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## LTChar
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##
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class LTChar(LTComponent, LTText):
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def __init__(self, matrix, font, fontsize, scaling, rise,
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text, textwidth, textdisp, ncs, graphicstate):
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LTText.__init__(self)
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self._text = text
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self.matrix = matrix
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self.fontname = font.fontname
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self.ncs = ncs
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self.graphicstate = graphicstate
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self.adv = textwidth * fontsize * scaling
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# compute the boundary rectangle.
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if font.is_vertical():
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# vertical
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width = font.get_width() * fontsize
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(vx, vy) = textdisp
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if vx is None:
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vx = width * 0.5
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else:
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vx = vx * fontsize * .001
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vy = (1000 - vy) * fontsize * .001
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tx = -vx
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ty = vy + rise
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bll = (tx, ty+self.adv)
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bur = (tx+width, ty)
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else:
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# horizontal
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height = font.get_height() * fontsize
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descent = font.get_descent() * fontsize
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ty = descent + rise
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bll = (0, ty)
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bur = (self.adv, ty+height)
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(a, b, c, d, e, f) = self.matrix
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self.upright = (0 < a*d*scaling and b*c <= 0)
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(x0, y0) = apply_matrix_pt(self.matrix, bll)
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(x1, y1) = apply_matrix_pt(self.matrix, bur)
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if x1 < x0:
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(x0, x1) = (x1, x0)
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if y1 < y0:
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(y0, y1) = (y1, y0)
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LTComponent.__init__(self, (x0, y0, x1, y1))
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if font.is_vertical():
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self.size = self.width
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else:
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self.size = self.height
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return
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def __repr__(self):
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return ('<%s %s matrix=%s font=%r adv=%s text=%r>' %
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(self.__class__.__name__, bbox2str(self.bbox),
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matrix2str(self.matrix), self.fontname, self.adv,
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self.get_text()))
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def get_text(self):
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return self._text
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def is_compatible(self, obj):
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"""Returns True if two characters can coexist in the same line."""
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return True
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## LTContainer
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##
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class LTContainer(LTComponent):
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def __init__(self, bbox):
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LTComponent.__init__(self, bbox)
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self._objs = []
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return
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def __iter__(self):
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return iter(self._objs)
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def __len__(self):
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return len(self._objs)
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def add(self, obj):
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self._objs.append(obj)
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return
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def extend(self, objs):
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for obj in objs:
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self.add(obj)
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return
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def analyze(self, laparams):
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for obj in self._objs:
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obj.analyze(laparams)
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return
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## LTExpandableContainer
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##
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class LTExpandableContainer(LTContainer):
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def __init__(self):
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LTContainer.__init__(self, (+INF, +INF, -INF, -INF))
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return
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def add(self, obj):
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LTContainer.add(self, obj)
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self.set_bbox((min(self.x0, obj.x0), min(self.y0, obj.y0),
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max(self.x1, obj.x1), max(self.y1, obj.y1)))
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return
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## LTTextContainer
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##
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class LTTextContainer(LTExpandableContainer, LTText):
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def __init__(self):
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LTText.__init__(self)
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LTExpandableContainer.__init__(self)
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return
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def get_text(self):
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return ''.join(obj.get_text() for obj in self if isinstance(obj, LTText))
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## LTTextLine
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##
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class LTTextLine(LTTextContainer):
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def __init__(self, word_margin):
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LTTextContainer.__init__(self)
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self.word_margin = word_margin
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return
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def __repr__(self):
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return ('<%s %s %r>' %
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(self.__class__.__name__, bbox2str(self.bbox),
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self.get_text()))
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def analyze(self, laparams):
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LTTextContainer.analyze(self, laparams)
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LTContainer.add(self, LTAnno('\n'))
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return
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def find_neighbors(self, plane, ratio):
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raise NotImplementedError
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class LTTextLineHorizontal(LTTextLine):
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def __init__(self, word_margin):
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LTTextLine.__init__(self, word_margin)
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self._x1 = +INF
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return
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def add(self, obj):
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if isinstance(obj, LTChar) and self.word_margin:
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margin = self.word_margin * max(obj.width, obj.height)
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if self._x1 < obj.x0-margin:
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LTContainer.add(self, LTAnno(' '))
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self._x1 = obj.x1
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LTTextLine.add(self, obj)
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return
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def find_neighbors(self, plane, ratio):
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d = ratio*self.height
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objs = plane.find((self.x0, self.y0-d, self.x1, self.y1+d))
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return [obj for obj in objs
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if (isinstance(obj, LTTextLineHorizontal) and
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abs(obj.height-self.height) < d and
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(abs(obj.x0-self.x0) < d or
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abs(obj.x1-self.x1) < d))]
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class LTTextLineVertical(LTTextLine):
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def __init__(self, word_margin):
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LTTextLine.__init__(self, word_margin)
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self._y0 = -INF
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return
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def add(self, obj):
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if isinstance(obj, LTChar) and self.word_margin:
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margin = self.word_margin * max(obj.width, obj.height)
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if obj.y1+margin < self._y0:
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LTContainer.add(self, LTAnno(' '))
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self._y0 = obj.y0
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LTTextLine.add(self, obj)
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return
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def find_neighbors(self, plane, ratio):
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d = ratio*self.width
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objs = plane.find((self.x0-d, self.y0, self.x1+d, self.y1))
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return [obj for obj in objs
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if (isinstance(obj, LTTextLineVertical) and
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abs(obj.width-self.width) < d and
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(abs(obj.y0-self.y0) < d or
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abs(obj.y1-self.y1) < d))]
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## LTTextBox
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##
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## A set of text objects that are grouped within
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## a certain rectangular area.
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##
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class LTTextBox(LTTextContainer):
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def __init__(self):
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LTTextContainer.__init__(self)
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self.index = -1
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return
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def __repr__(self):
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return ('<%s(%s) %s %r>' %
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(self.__class__.__name__,
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self.index, bbox2str(self.bbox), self.get_text()))
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class LTTextBoxHorizontal(LTTextBox):
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def analyze(self, laparams):
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LTTextBox.analyze(self, laparams)
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self._objs.sort(key=lambda obj: -obj.y1)
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return
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def get_writing_mode(self):
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return 'lr-tb'
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class LTTextBoxVertical(LTTextBox):
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def analyze(self, laparams):
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LTTextBox.analyze(self, laparams)
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self._objs.sort(key=lambda obj: -obj.x1)
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return
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def get_writing_mode(self):
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return 'tb-rl'
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## LTTextGroup
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##
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class LTTextGroup(LTTextContainer):
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def __init__(self, objs):
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LTTextContainer.__init__(self)
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self.extend(objs)
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return
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class LTTextGroupLRTB(LTTextGroup):
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def analyze(self, laparams):
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LTTextGroup.analyze(self, laparams)
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# reorder the objects from top-left to bottom-right.
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self._objs.sort(key=lambda obj:
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(1-laparams.boxes_flow)*(obj.x0) -
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(1+laparams.boxes_flow)*(obj.y0+obj.y1))
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return
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class LTTextGroupTBRL(LTTextGroup):
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def analyze(self, laparams):
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LTTextGroup.analyze(self, laparams)
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# reorder the objects from top-right to bottom-left.
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self._objs.sort(key=lambda obj:
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-(1+laparams.boxes_flow)*(obj.x0+obj.x1)
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- (1-laparams.boxes_flow)*(obj.y1))
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return
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## LTLayoutContainer
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##
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class LTLayoutContainer(LTContainer):
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def __init__(self, bbox):
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LTContainer.__init__(self, bbox)
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self.groups = None
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return
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# group_objects: group text object to textlines.
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def group_objects(self, laparams, objs):
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obj0 = None
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line = None
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for obj1 in objs:
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if obj0 is not None:
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# halign: obj0 and obj1 is horizontally aligned.
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#
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# +------+ - - -
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# | obj0 | - - +------+ -
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# | | | obj1 | | (line_overlap)
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# +------+ - - | | -
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# - - - +------+
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#
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# |<--->|
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# (char_margin)
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halign = (obj0.is_compatible(obj1) and
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obj0.is_voverlap(obj1) and
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(min(obj0.height, obj1.height) * laparams.line_overlap <
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obj0.voverlap(obj1)) and
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(obj0.hdistance(obj1) <
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max(obj0.width, obj1.width) * laparams.char_margin))
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# valign: obj0 and obj1 is vertically aligned.
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#
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# +------+
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# | obj0 |
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# | |
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# +------+ - - -
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# | | | (char_margin)
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# +------+ - -
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# | obj1 |
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# | |
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# +------+
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#
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# |<-->|
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# (line_overlap)
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valign = (laparams.detect_vertical and
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obj0.is_compatible(obj1) and
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obj0.is_hoverlap(obj1) and
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(min(obj0.width, obj1.width) * laparams.line_overlap <
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obj0.hoverlap(obj1)) and
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(obj0.vdistance(obj1) <
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max(obj0.height, obj1.height) * laparams.char_margin))
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if ((halign and isinstance(line, LTTextLineHorizontal)) or
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(valign and isinstance(line, LTTextLineVertical))):
|
|
line.add(obj1)
|
|
elif line is not None:
|
|
yield line
|
|
line = None
|
|
else:
|
|
if valign and not halign:
|
|
line = LTTextLineVertical(laparams.word_margin)
|
|
line.add(obj0)
|
|
line.add(obj1)
|
|
elif halign and not valign:
|
|
line = LTTextLineHorizontal(laparams.word_margin)
|
|
line.add(obj0)
|
|
line.add(obj1)
|
|
else:
|
|
line = LTTextLineHorizontal(laparams.word_margin)
|
|
line.add(obj0)
|
|
yield line
|
|
line = None
|
|
obj0 = obj1
|
|
if line is None:
|
|
line = LTTextLineHorizontal(laparams.word_margin)
|
|
line.add(obj0)
|
|
yield line
|
|
return
|
|
|
|
# group_textlines: group neighboring lines to textboxes.
|
|
def group_textlines(self, laparams, lines):
|
|
plane = Plane(self.bbox)
|
|
plane.extend(lines)
|
|
boxes = {}
|
|
for line in lines:
|
|
neighbors = line.find_neighbors(plane, laparams.line_margin)
|
|
if line not in neighbors: continue
|
|
members = []
|
|
for obj1 in neighbors:
|
|
members.append(obj1)
|
|
if obj1 in boxes:
|
|
members.extend(boxes.pop(obj1))
|
|
if isinstance(line, LTTextLineHorizontal):
|
|
box = LTTextBoxHorizontal()
|
|
else:
|
|
box = LTTextBoxVertical()
|
|
for obj in uniq(members):
|
|
box.add(obj)
|
|
boxes[obj] = box
|
|
done = set()
|
|
for line in lines:
|
|
if line not in boxes: continue
|
|
box = boxes[line]
|
|
if box in done:
|
|
continue
|
|
done.add(box)
|
|
if not box.is_empty():
|
|
yield box
|
|
return
|
|
|
|
# group_textboxes: group textboxes hierarchically.
|
|
def group_textboxes(self, laparams, boxes):
|
|
assert boxes, str((laparams, boxes))
|
|
|
|
def dist(obj1, obj2):
|
|
"""A distance function between two TextBoxes.
|
|
|
|
Consider the bounding rectangle for obj1 and obj2.
|
|
Return its area less the areas of obj1 and obj2,
|
|
shown as 'www' below. This value may be negative.
|
|
+------+..........+ (x1, y1)
|
|
| obj1 |wwwwwwwwww:
|
|
+------+www+------+
|
|
:wwwwwwwwww| obj2 |
|
|
(x0, y0) +..........+------+
|
|
"""
|
|
x0 = min(obj1.x0, obj2.x0)
|
|
y0 = min(obj1.y0, obj2.y0)
|
|
x1 = max(obj1.x1, obj2.x1)
|
|
y1 = max(obj1.y1, obj2.y1)
|
|
return ((x1-x0)*(y1-y0) - obj1.width*obj1.height - obj2.width*obj2.height)
|
|
|
|
def isany(obj1, obj2):
|
|
"""Check if there's any other object between obj1 and obj2.
|
|
"""
|
|
x0 = min(obj1.x0, obj2.x0)
|
|
y0 = min(obj1.y0, obj2.y0)
|
|
x1 = max(obj1.x1, obj2.x1)
|
|
y1 = max(obj1.y1, obj2.y1)
|
|
objs = set(plane.find((x0, y0, x1, y1)))
|
|
return objs.difference((obj1, obj2))
|
|
|
|
def key_obj(t):
|
|
(c,d,_,_) = t
|
|
return (c,d)
|
|
|
|
dists = SortedListWithKey(key=key_obj)
|
|
for i in range(len(boxes)):
|
|
obj1 = boxes[i]
|
|
for j in range(i+1, len(boxes)):
|
|
obj2 = boxes[j]
|
|
dists.add((0, dist(obj1, obj2), obj1, obj2))
|
|
plane = Plane(self.bbox)
|
|
plane.extend(boxes)
|
|
while dists:
|
|
(c, d, obj1, obj2) = dists.pop(0)
|
|
if c == 0 and isany(obj1, obj2):
|
|
dists.add((1, d, obj1, obj2))
|
|
continue
|
|
if (isinstance(obj1, (LTTextBoxVertical, LTTextGroupTBRL)) or
|
|
isinstance(obj2, (LTTextBoxVertical, LTTextGroupTBRL))):
|
|
group = LTTextGroupTBRL([obj1, obj2])
|
|
else:
|
|
group = LTTextGroupLRTB([obj1, obj2])
|
|
plane.remove(obj1)
|
|
plane.remove(obj2)
|
|
removed = [obj1, obj2]
|
|
to_remove = [ (c,d,obj1,obj2) for (c,d,obj1,obj2) in dists
|
|
if (obj1 in removed or obj2 in removed) ]
|
|
for r in to_remove:
|
|
dists.remove(r)
|
|
for other in plane:
|
|
dists.add((0, dist(group, other), group, other))
|
|
plane.add(group)
|
|
assert len(plane) == 1, str(len(plane))
|
|
return list(plane)
|
|
|
|
def analyze(self, laparams):
|
|
# textobjs is a list of LTChar objects, i.e.
|
|
# it has all the individual characters in the page.
|
|
(textobjs, otherobjs) = fsplit(lambda obj: isinstance(obj, LTChar), self)
|
|
for obj in otherobjs:
|
|
obj.analyze(laparams)
|
|
if not textobjs:
|
|
return
|
|
textlines = list(self.group_objects(laparams, textobjs))
|
|
(empties, textlines) = fsplit(lambda obj: obj.is_empty(), textlines)
|
|
for obj in empties:
|
|
obj.analyze(laparams)
|
|
textboxes = list(self.group_textlines(laparams, textlines))
|
|
if -1 <= laparams.boxes_flow and laparams.boxes_flow <= +1 and textboxes:
|
|
self.groups = self.group_textboxes(laparams, textboxes)
|
|
assigner = IndexAssigner()
|
|
for group in self.groups:
|
|
group.analyze(laparams)
|
|
assigner.run(group)
|
|
textboxes.sort(key=lambda box: box.index)
|
|
else:
|
|
def getkey(box):
|
|
if isinstance(box, LTTextBoxVertical):
|
|
return (0, -box.x1, box.y0)
|
|
else:
|
|
return (1, box.y0, box.x0)
|
|
textboxes.sort(key=getkey)
|
|
self._objs = textboxes + otherobjs + empties
|
|
return
|
|
|
|
|
|
## LTFigure
|
|
##
|
|
class LTFigure(LTLayoutContainer):
|
|
|
|
def __init__(self, name, bbox, matrix):
|
|
self.name = name
|
|
self.matrix = matrix
|
|
(x, y, w, h) = bbox
|
|
bbox = get_bound(apply_matrix_pt(matrix, (p, q))
|
|
for (p, q) in ((x, y), (x+w, y), (x, y+h), (x+w, y+h)))
|
|
LTLayoutContainer.__init__(self, bbox)
|
|
return
|
|
|
|
def __repr__(self):
|
|
return ('<%s(%s) %s matrix=%s>' %
|
|
(self.__class__.__name__, self.name,
|
|
bbox2str(self.bbox), matrix2str(self.matrix)))
|
|
|
|
def analyze(self, laparams):
|
|
if not laparams.all_texts:
|
|
return
|
|
LTLayoutContainer.analyze(self, laparams)
|
|
return
|
|
|
|
|
|
## LTPage
|
|
##
|
|
class LTPage(LTLayoutContainer):
|
|
|
|
def __init__(self, pageid, bbox, rotate=0):
|
|
LTLayoutContainer.__init__(self, bbox)
|
|
self.pageid = pageid
|
|
self.rotate = rotate
|
|
return
|
|
|
|
def __repr__(self):
|
|
return ('<%s(%r) %s rotate=%r>' %
|
|
(self.__class__.__name__, self.pageid,
|
|
bbox2str(self.bbox), self.rotate))
|