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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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