_expand_include_patterns() — langchain Function Reference

Source Code

libs/langchain_v1/langchain/agents/middleware/file_search.py lines 23–54

def _expand_include_patterns(pattern: str) -> list[str] | None:
    """Expand brace patterns like `*.{py,pyi}` into a list of globs."""
    if "}" in pattern and "{" not in pattern:
        return None

    expanded: list[str] = []

    def _expand(current: str) -> None:
        start = current.find("{")
        if start == -1:
            expanded.append(current)
            return

        end = current.find("}", start)
        if end == -1:
            raise ValueError

        prefix = current[:start]
        suffix = current[end + 1 :]
        inner = current[start + 1 : end]
        if not inner:
            raise ValueError

        for option in inner.split(","):
            _expand(prefix + option + suffix)

    try:
        _expand(pattern)
    except ValueError:
        return None

    return expanded