Function _detect_indent_style

src/sandbox_vm/tools/code/patch.py:171–215

Detect indentation style (tabs vs spaces) and unit size from file lines. Args: lines: Lines from the matched file region Returns: Tuple of (style, unit_size) where: - style: 'tabs' or 'spaces' - unit_size: Number of spaces per indent level (or 1 for tab

(lines: List[str])

def _detect_indent_style(lines: List[str]) -> tuple:
    """
    Detect indentation style (tabs vs spaces) and unit size from file lines.

    Args:
        lines: Lines from the matched file region

    Returns:
        Tuple of (style, unit_size) where:
        - style: 'tabs' or 'spaces'
        - unit_size: Number of spaces per indent level (or 1 for tabs)
    """
    indents = []

    for line in lines:
        if line and line.strip() and line[0] in " \t":
            indent = _get_indentation(line)
            if indent:
                indents.append(indent)

    if not indents:
        return ("spaces", 4)  # Default fallback

    # Check if using tabs
    if any("\t" in indent for indent in indents):
        return ("tabs", 1)

    # Detect space unit size by finding common indent differences
    indent_sizes = sorted(set(len(indent) for indent in indents))

    if len(indent_sizes) >= 2:
        # Calculate differences between consecutive indent levels
        differences = [
            indent_sizes[i + 1] - indent_sizes[i] for i in range(len(indent_sizes) - 1)
        ]

        # Use the most common difference as the unit
        if differences:
            from collections import Counter

            unit = Counter(differences).most_common(1)[0][0]
            return ("spaces", unit if unit > 0 else 4)

    # Fallback: assume 4 spaces
    return ("spaces", 4)


def _get_min_indentation(lines: List[str]) -> str: