You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
148 lines
4.2 KiB
148 lines
4.2 KiB
from functools import lru_cache
|
|
import re
|
|
from typing import Dict, List
|
|
|
|
from ._cell_widths import CELL_WIDTHS
|
|
from ._lru_cache import LRUCache
|
|
|
|
# Regex to match sequence of the most common character ranges
|
|
_is_single_cell_widths = re.compile("^[\u0020-\u006f\u00a0\u02ff\u0370-\u0482]*$").match
|
|
|
|
|
|
def cell_len(text: str, _cache: Dict[str, int] = LRUCache(1024 * 4)) -> int:
|
|
"""Get the number of cells required to display text.
|
|
|
|
Args:
|
|
text (str): Text to display.
|
|
|
|
Returns:
|
|
int: Get the number of cells required to display text.
|
|
"""
|
|
|
|
if _is_single_cell_widths(text):
|
|
return len(text)
|
|
else:
|
|
cached_result = _cache.get(text, None)
|
|
if cached_result is not None:
|
|
return cached_result
|
|
_get_size = get_character_cell_size
|
|
total_size = sum(_get_size(character) for character in text)
|
|
if len(text) <= 64:
|
|
_cache[text] = total_size
|
|
return total_size
|
|
|
|
|
|
@lru_cache(maxsize=4096)
|
|
def get_character_cell_size(character: str) -> int:
|
|
"""Get the cell size of a character.
|
|
|
|
Args:
|
|
character (str): A single character.
|
|
|
|
Returns:
|
|
int: Number of cells (0, 1 or 2) occupied by that character.
|
|
"""
|
|
if _is_single_cell_widths(character):
|
|
return 1
|
|
|
|
return _get_codepoint_cell_size(ord(character))
|
|
|
|
|
|
@lru_cache(maxsize=4096)
|
|
def _get_codepoint_cell_size(codepoint: int) -> int:
|
|
"""Get the cell size of a character.
|
|
|
|
Args:
|
|
character (str): A single character.
|
|
|
|
Returns:
|
|
int: Number of cells (0, 1 or 2) occupied by that character.
|
|
"""
|
|
|
|
_table = CELL_WIDTHS
|
|
lower_bound = 0
|
|
upper_bound = len(_table) - 1
|
|
index = (lower_bound + upper_bound) // 2
|
|
while True:
|
|
start, end, width = _table[index]
|
|
if codepoint < start:
|
|
upper_bound = index - 1
|
|
elif codepoint > end:
|
|
lower_bound = index + 1
|
|
else:
|
|
return 0 if width == -1 else width
|
|
if upper_bound < lower_bound:
|
|
break
|
|
index = (lower_bound + upper_bound) // 2
|
|
return 1
|
|
|
|
|
|
def set_cell_size(text: str, total: int) -> str:
|
|
"""Set the length of a string to fit within given number of cells."""
|
|
|
|
if _is_single_cell_widths(text):
|
|
size = len(text)
|
|
if size < total:
|
|
return text + " " * (total - size)
|
|
return text[:total]
|
|
|
|
if not total:
|
|
return ""
|
|
cell_size = cell_len(text)
|
|
if cell_size == total:
|
|
return text
|
|
if cell_size < total:
|
|
return text + " " * (total - cell_size)
|
|
|
|
start = 0
|
|
end = len(text)
|
|
|
|
# Binary search until we find the right size
|
|
while True:
|
|
pos = (start + end) // 2
|
|
before = text[: pos + 1]
|
|
before_len = cell_len(before)
|
|
if before_len == total + 1 and cell_len(before[-1]) == 2:
|
|
return before[:-1] + " "
|
|
if before_len == total:
|
|
return before
|
|
if before_len > total:
|
|
end = pos
|
|
else:
|
|
start = pos
|
|
|
|
|
|
# TODO: This is inefficient
|
|
# TODO: This might not work with CWJ type characters
|
|
def chop_cells(text: str, max_size: int, position: int = 0) -> List[str]:
|
|
"""Break text in to equal (cell) length strings."""
|
|
_get_character_cell_size = get_character_cell_size
|
|
characters = [
|
|
(character, _get_character_cell_size(character)) for character in text
|
|
][::-1]
|
|
total_size = position
|
|
lines: List[List[str]] = [[]]
|
|
append = lines[-1].append
|
|
|
|
pop = characters.pop
|
|
while characters:
|
|
character, size = pop()
|
|
if total_size + size > max_size:
|
|
lines.append([character])
|
|
append = lines[-1].append
|
|
total_size = size
|
|
else:
|
|
total_size += size
|
|
append(character)
|
|
return ["".join(line) for line in lines]
|
|
|
|
|
|
if __name__ == "__main__": # pragma: no cover
|
|
|
|
print(get_character_cell_size("😽"))
|
|
for line in chop_cells("""这是对亚洲语言支持的测试。面对模棱两可的想法，拒绝猜测的诱惑。""", 8):
|
|
print(line)
|
|
for n in range(80, 1, -1):
|
|
print(set_cell_size("""这是对亚洲语言支持的测试。面对模棱两可的想法，拒绝猜测的诱惑。""", n) + "|")
|
|
print("x" * n)
|