matcher.py 文件源码

def match_rules_context(tree, rules, parent_context={}):
    """Recursively matches a Tree structure with rules and returns context

    Args:
        tree (Tree): Parsed tree structure
        rules (dict): See match_rules
        parent_context (dict): Context of parent call
    Returns:
        dict: Context matched dictionary of matched rules or
        None if no match
    """
    for template, match_rules in rules.items():
        context = parent_context.copy()
        if match_template(tree, template, context):
            for key, child_rules in match_rules.items():
                child_context = match_rules_context(context[key], child_rules, context)
                if child_context:
                    for k, v in child_context.items():
                        context[k] = v
                else:
                    return None
            return context
    return None