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# SPDX-License-Identifier: GPL-3.0-or-later
# Copyright (C) 2025-2026 Benjamin Abendroth <braph93@gmx.de>
'''String utility functions.'''
import re
import subprocess
from .errors import CrazyError
_VALID_OPTION_STRING_RE = re.compile('-[^\\s,]+')
_VALID_VARIABLE_RE = re.compile('[a-zA-Z_][a-zA-Z0-9_]*')
def contains_space(string):
'''Check if string contains space type characters.'''
return (' ' in string or '\t' in string or '\n' in string)
def is_empty_or_whitespace(string):
'''Check if string is empty or whitespace.'''
return not string.strip()
def is_valid_extended_regex(string):
'''Check if string is a valid extended regular expression.'''
try:
r = subprocess.run(
['grep', '-q', '-E', '--', string],
input=b"",
stdout=subprocess.DEVNULL,
stderr=subprocess.DEVNULL,
timeout=1,
check=False)
return r.returncode != 2
except (FileNotFoundError, PermissionError, subprocess.TimeoutExpired):
return True
def validate_prog(string):
'''Validate a program string.'''
if is_empty_or_whitespace(string):
raise CrazyError('value is empty')
if string.startswith(' '):
raise CrazyError('begins with space')
if string.endswith(' '):
raise CrazyError('ends with space')
if '\t' in string:
raise CrazyError('contains a tabulator')
if '\n' in string:
raise CrazyError('contains a newline')
if ' ' in string:
raise CrazyError('contains multiple spaces')
def indent(string, num_spaces):
'''Indents each line in a string by a specified number of spaces,
preserving empty lines.
Args:
string (str): The input string to be indented.
num_spaces (int): The number of spaces to indent each line.
Returns:
str: The indented string.
'''
assert isinstance(string, str), \
f"indent: string: expected str, got {string!r}"
assert isinstance(num_spaces, int), \
f"indent: num_spaces: expected int, got {num_spaces!r}"
spaces = ' ' * num_spaces
lines = string.split('\n')
lines = [(spaces + line) if line.strip() else line for line in lines]
return '\n'.join(lines)
def join_with_wrap(primary_sep, secondary_sep,
max_line_length, items, line_prefix=''):
'''
Join a list of strings with a primary separator, automatically wrapping
to a new line (using the secondary separator) when the current line
would exceed max_line_length.
Args:
primary_sep:
String used to separate items on the same line.
secondary_sep:
String used to separate wrapped lines.
max_line_length:
Maximum number of characters per line.
items:
List of strings to join.
line_prefix:
Prefix each line with a prefix.
Returns:
str: Joined string with line wrapping
'''
lines = []
current_items = []
current_length = len(line_prefix)
for item in items:
sep_len = len(primary_sep) if current_items else 0
new_length = current_length + sep_len + len(item)
if current_items and new_length > max_line_length:
# flush current line
lines.append(line_prefix + primary_sep.join(current_items))
current_items = [item]
current_length = len(line_prefix) + len(item)
else:
current_items.append(item)
current_length = new_length
if current_items:
lines.append(line_prefix + primary_sep.join(current_items))
return secondary_sep.join(lines)
def is_valid_option_string(option_string):
'''Check if `option_string` is a valid option string.'''
if not _VALID_OPTION_STRING_RE.fullmatch(option_string):
return False
if option_string == '--':
return False
return True
def is_valid_variable_name(string):
'''Check if string is a valid shell variable name.'''
return _VALID_VARIABLE_RE.fullmatch(string)
def strip_comments(string):
'''Strip shell comments from string.'''
lines = []
for line in string.split('\n'):
if line.lstrip().startswith('#'):
continue
lines.append(line)
return '\n'.join(lines)
def strip_double_empty_lines(string):
'''Collapse triple newlines into double newlines.'''
return string.replace('\n\n\n', '\n\n')
def replace_many(string, replacements):
'''
Replace multiple substrings in `string` according to a list
of (search, replace) tuples.
'''
s = string
for search, replace in replacements:
s = s.replace(search, replace)
return s
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