94 lines
3.3 KiB
Python
94 lines
3.3 KiB
Python
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from __future__ import annotations
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import re
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from typing import Iterable
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from ._loop import loop_last
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from .cells import cell_len, chop_cells
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re_word = re.compile(r"\s*\S+\s*")
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def words(text: str) -> Iterable[tuple[int, int, str]]:
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"""Yields each word from the text as a tuple
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containing (start_index, end_index, word). A "word" in this context may
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include the actual word and any whitespace to the right.
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"""
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position = 0
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word_match = re_word.match(text, position)
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while word_match is not None:
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start, end = word_match.span()
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word = word_match.group(0)
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yield start, end, word
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word_match = re_word.match(text, end)
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def divide_line(text: str, width: int, fold: bool = True) -> list[int]:
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"""Given a string of text, and a width (measured in cells), return a list
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of cell offsets which the string should be split at in order for it to fit
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within the given width.
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Args:
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text: The text to examine.
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width: The available cell width.
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fold: If True, words longer than `width` will be folded onto a new line.
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Returns:
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A list of indices to break the line at.
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"""
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break_positions: list[int] = [] # offsets to insert the breaks at
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append = break_positions.append
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cell_offset = 0
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_cell_len = cell_len
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for start, _end, word in words(text):
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word_length = _cell_len(word.rstrip())
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remaining_space = width - cell_offset
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word_fits_remaining_space = remaining_space >= word_length
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if word_fits_remaining_space:
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# Simplest case - the word fits within the remaining width for this line.
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cell_offset += _cell_len(word)
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else:
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# Not enough space remaining for this word on the current line.
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if word_length > width:
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# The word doesn't fit on any line, so we can't simply
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# place it on the next line...
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if fold:
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# Fold the word across multiple lines.
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folded_word = chop_cells(word, width=width)
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for last, line in loop_last(folded_word):
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if start:
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append(start)
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if last:
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cell_offset = _cell_len(line)
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else:
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start += len(line)
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else:
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# Folding isn't allowed, so crop the word.
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if start:
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append(start)
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cell_offset = _cell_len(word)
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elif cell_offset and start:
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# The word doesn't fit within the remaining space on the current
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# line, but it *can* fit on to the next (empty) line.
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append(start)
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cell_offset = _cell_len(word)
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return break_positions
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if __name__ == "__main__": # pragma: no cover
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from .console import Console
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console = Console(width=10)
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console.print("12345 abcdefghijklmnopqrstuvwyxzABCDEFGHIJKLMNOPQRSTUVWXYZ 12345")
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print(chop_cells("abcdefghijklmnopqrstuvwxyz", 10))
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console = Console(width=20)
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console.rule()
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console.print("TextualはPythonの高速アプリケーション開発フレームワークです")
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console.rule()
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console.print("アプリケーションは1670万色を使用でき")
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