parse() — langchain Function Reference

Architecture documentation for the parse() function in yaml.py from the langchain codebase.

Function python OutputParsing StreamingParsers calls 1 called by 1

Entity Profile

OutputParsing→ StreamingParsers→ parse() — langchain Function Reference

Dependency Diagram

graph TD
  77eefb4e_ef8f_219b_b461_97fe5badd155["parse()"]
  ace14fd9_5f64_6948_e02f_713d598d0b6f["YamlOutputParser"]
  77eefb4e_ef8f_219b_b461_97fe5badd155 -->|defined in| ace14fd9_5f64_6948_e02f_713d598d0b6f
  77eefb4e_ef8f_219b_b461_97fe5badd155["parse()"]
  77eefb4e_ef8f_219b_b461_97fe5badd155 -->|calls| 77eefb4e_ef8f_219b_b461_97fe5badd155
  77eefb4e_ef8f_219b_b461_97fe5badd155["parse()"]
  77eefb4e_ef8f_219b_b461_97fe5badd155 -->|calls| 77eefb4e_ef8f_219b_b461_97fe5badd155
  style 77eefb4e_ef8f_219b_b461_97fe5badd155 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain/langchain_classic/output_parsers/yaml.py lines 31–44

    def parse(self, text: str) -> T:
        try:
            # Greedy search for 1st yaml candidate.
            match = re.search(self.pattern, text.strip())
            # If no backticks were present, try to parse the entire output as yaml.
            yaml_str = match.group("yaml") if match else text

            json_object = yaml.safe_load(yaml_str)
            return self.pydantic_object.model_validate(json_object)

        except (yaml.YAMLError, ValidationError) as e:
            name = self.pydantic_object.__name__
            msg = f"Failed to parse {name} from completion {text}. Got: {e}"
            raise OutputParserException(msg, llm_output=text) from e