Expand description

A YAML 1.2 parser using a greedy parsing algorithm with PEG atoms.

The major purpose of this crate is to let the user build their own YAML reader/builder/validator.

This parser is not ensuring about YAML spec but almost functions are well-implemented.

The buffer reader has also not been implemented, but sub-parsers can read the chunks.

WARNING: YAML 1.2 is compatible with JSON (JavaScript Object Notation) format, but not in the strict mode.


Function parse/parse_cyclic is used to parse YAML string into Node data structure, which has a data holder Yaml. There also has a multiple-threaded version corresponding to NodeRc/NodeArc and YamlRc/YamlArc. To get back as string, please use dump function.

There are also have some macros for building Node structure from Rust data. Especially node! macro, almost data can be built by the macro literally.

If you went to rise your own error message, indicated_msg might be a good choice.

Anchor Parsing

  • parse: The parser will replace the anchors during parsing.
  • parse_cyclic: Cyclic data means that a parent alias is inserted at the child node. Keep the alias to avoid having undefined anchors when parsing.

No Standard Library

The std feature is a default feature, use --no-default-features to build in the no-std mode.

Serialization and Deserialization

Enable serde feature to use serde crate, which provides a set of protocol traits to convert between custom Rust data. Please be aware that the additional fields will be discarded when convert to a fix-sized structure. For example, the structure fields can be turned into map keys as well.

On the other hand, the primitive types are still able to transform to YAML data without serialization, according to built-in From and Into traits.


pub use crate::dumper::dump;
pub use crate::parser::parse;
pub use crate::parser::parse_cyclic;


Dumper components.

Parser components, includes parser error.

This module contains the representation holders, the underlayer type of Yaml type.


The implementation of serialization. The technique is come from serde.


Create Node items literally.


Indicator of the node use to index the sequence position.

Readonly node, including line number, column number, type assertion and anchor. You can access Yaml type through Node::yaml method.


YAML data types, but it is recommended to use Node for shorten code.


Indicate the position of the documentation. This function will show the line number and column number of the position.

Same as indicated_msg, but join the path before message.

Type Definitions

The map data structure of YAML.

A node with alloc::sync::Arc holder.

A node with alloc::rc::Rc holder.

The sequence data structure of YAML.

A YAML data with alloc::sync::Arc holder.

A YAML data with alloc::rc::Rc holder.