Crate yami 

yami - Minimal, Zero-Copy YAML Parser for Rust

yami is a lightweight, zero-copy YAML parser designed for minimal allocations and strict, unambiguous parsing semantics. Scalars borrow directly from the input string as &'a str, eliminating heap string allocations during parsing.

Background & Motivation

Standard YAML parsers in Rust (such as serde_yaml) enforce DeserializeOwned trait bounds that prevent deserializing directly into types borrowing string slices (&'a str) from the input document. This limitation is discussed in dtolnay/serde-yaml#94 and prompted the call for a minimal zero-copy YAML parser in dtolnay/request-for-implementation#9.

yami provides a direct, zero-copy AST representation where every scalar is an unallocated &'a str slice into the source text.

Core Types

• Yaml<'a>: Represents any YAML node (Scalar(&'a str), Sequence(Vec<Yaml<'a>>) , Mapping(Vec<Entry<'a>>)).
• Entry<'a>: A key-value pair inside a YAML mapping.
• YamlError: Precise parsing errors including 1-indexed (line, column) positions.

Re-exports

pub use ast::Entry;

pub use ast::Yaml;

pub use error::ErrorKind;

pub use error::Position;

pub use error::Result;

pub use error::YamlError;

pub use parser::parse;

pub use scanner::Line;

pub use scanner::Scanner;

Modules

ast

Abstract Syntax Tree (AST) representations for parsed YAML data.

error

Error types and diagnostics for YAML parsing.

parser

Parser modules for YAML block and flow constructs.

scanner

Zero-copy scanner and indentation tracker for YAML lines and tokens.