File size: 2,298 Bytes
61bb557 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 | """Extracted verbatim from python-slugify (github.com/un33k/python-slugify).
This is the `_modern_truncate` helper from slugify/slugify.py, isolated so the
trailing-delimiter bug can be reproduced without the full package. The function
body is copied exactly from the named commit; only the module docstring and the
DEFAULT_SEPARATOR constant were added for standalone use.
"""
DEFAULT_SEPARATOR = '-'
# Provenance: commit 8f9a550 (the fix)
def truncate(text: str, max_length: int, word_boundary: bool, separator: str, save_order: bool) -> str:
"""Budget internal dash-separated tokens before mapping output delimiters.
Output delimiters may also occur in words; never strip or split emitted text.
Post replacements retain the historical global dash-to-separator mapping.
"""
if max_length <= 0:
return text.replace(DEFAULT_SEPARATOR, separator)
output_length = len(text) + text.count(DEFAULT_SEPARATOR) * (len(separator) - 1)
if output_length <= max_length:
return text.replace(DEFAULT_SEPARATOR, separator)
tokens = text.split(DEFAULT_SEPARATOR)
if word_boundary:
words: list[str] = []
length = 0
for word in tokens:
if not word:
continue
next_length = length + len(word) + (len(separator) if words else 0)
if next_length <= max_length:
words.append(word)
length = next_length
elif save_order:
break
if words:
return separator.join(words)
# A hard cut may shorten a word but must not emit a partial/trailing delimiter.
parts: list[str] = []
length = 0
previous_index = 0
for index, word in enumerate(tokens):
if not word:
continue
# Keep repeated delimiters with the next nonempty word until it fits.
delimiter = separator * (index - previous_index)
remaining = max_length - length - len(delimiter)
if remaining <= 0:
break
parts.append(delimiter + word[:remaining])
length += len(delimiter) + min(len(word), remaining)
previous_index = index
if len(word) > remaining:
break
return ''.join(parts)
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