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