Function last_boxed_only_string

eval/math_dapo.py:21–48

Extract the last LaTeX boxed expression from a string. Args: string: Input string containing LaTeX code Returns: The last boxed expression or None if not found

(string: str)

def last_boxed_only_string(string: str) -> Optional[str]:
    """Extract the last LaTeX boxed expression from a string.
    
    Args:
        string: Input string containing LaTeX code
        
    Returns:
        The last boxed expression or None if not found
    """
    idx = string.rfind("\\boxed{")
    if idx < 0:
        return None

    i = idx
    right_brace_idx = None
    num_left_braces_open = 0

    while i < len(string):
        if string[i] == "{":
            num_left_braces_open += 1
        if string[i] == "}":
            num_left_braces_open -= 1
            if num_left_braces_open == 0:
                right_brace_idx = i
                break
        i += 1

    return string[idx:right_brace_idx + 1] if right_brace_idx is not None else None


def remove_boxed(s: str) -> str: