mirror of
https://github.com/pre-commit/pre-commit-hooks.git
synced 2026-03-31 02:36:52 +00:00
137 lines
4.3 KiB
Python
137 lines
4.3 KiB
Python
from __future__ import annotations
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import argparse
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from collections.abc import Sequence
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def main(argv: Sequence[str] | None = None) -> int:
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parser = argparse.ArgumentParser()
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parser.add_argument('filenames', nargs='*', help='Filenames to check.')
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args = parser.parse_args(argv)
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retval = 0
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for filename in args.filenames:
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try:
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with open(filename, encoding='UTF-8') as f:
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content = f.read()
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if not _validate_fluent_syntax(content, filename):
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retval = 1
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except (OSError, UnicodeDecodeError) as exc:
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print(f"{filename}: Failed to read file ({exc})")
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retval = 1
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return retval
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def _validate_fluent_syntax(content: str, filename: str) -> bool:
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"""Validate Fluent FTL file syntax."""
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lines = content.splitlines()
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errors = []
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# Track current message context
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current_message = None
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has_default_variant = False
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in_select_expression = False
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for line_num, line in enumerate(lines, 1):
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# Skip empty lines and comments
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if not line.strip() or line.strip().startswith('#'):
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continue
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# Check for message definitions (identifier = value)
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if (
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'=' in line and
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not line.startswith(' ') and
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not line.startswith('\t')
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):
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current_message = line.split('=')[0].strip()
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in_select_expression = False
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has_default_variant = False
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# Validate message identifier
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if not _is_valid_identifier(current_message):
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errors.append(
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f"Line {line_num}: Invalid message identifier "
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f'"{current_message}"',
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)
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# Check for select expressions (contains -> or other select syntax)
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if '{' in line and '$' in line and '->' in line:
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in_select_expression = True
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# Handle indented content (attributes, variants, multiline values)
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elif line.startswith(' ') or line.startswith('\t'):
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if current_message is None:
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errors.append(
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f"Line {line_num}: Indented content without "
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f"message context",
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)
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continue
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stripped = line.strip()
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# Check for attribute definitions
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if stripped.startswith('.') and '=' in stripped:
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# Remove leading dot
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attr_name = stripped.split('=')[0].strip()[1:]
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if not _is_valid_identifier(attr_name):
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errors.append(
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f"Line {line_num}: Invalid attribute identifier "
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f'"{attr_name}"',
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)
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# Check for variants in select expressions
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elif stripped.startswith('*') or (
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stripped.startswith('[') and stripped.endswith(']')
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):
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if not in_select_expression:
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errors.append(
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f"Line {line_num}: Variant definition outside "
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f"select expression",
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)
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elif stripped.startswith('*'):
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has_default_variant = True
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else:
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# Non-* variants don't set has_default_variant
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pass
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# Check for unterminated select expressions
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if in_select_expression and current_message:
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if '}' in line:
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in_select_expression = False
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if not has_default_variant:
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errors.append(
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f"Line {line_num}: Select expression missing "
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f"default variant (marked with *)",
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)
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# Report errors
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if errors:
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for error in errors:
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print(f"{filename}: {error}")
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return False
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return True
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def _is_valid_identifier(identifier: str) -> bool:
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"""Check if identifier follows Fluent naming conventions."""
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if not identifier:
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return False
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# Must start with letter
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if not identifier[0].isalpha():
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return False
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# Can contain letters, numbers, underscores, and hyphens
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for char in identifier:
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if not (char.isalnum() or char in '_-'):
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return False
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return True
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if __name__ == '__main__':
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raise SystemExit(main())
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