Function plugin 

pub fn plugin() -> Plugin

The css grammar as an engine plugin, named css: Css in the canonical port. Its options are an Options bag (Options::to_value).

It installs the grammar’s rules (each alternate tagged with the group css), the canonical option overrides and the cssToken matcher. Use it on jsonic, as make does and the canonical port documents; on a bare engine it gives the same results.

The engine’s own parse returns the tree as an engine tabnas::Value, the canonical port’s plain objects: equal to them value for value, though the engine writes a whole number as 1.0 in JSON, a position.end that was never recorded is absent rather than an undefined key, and an error’s column counts Unicode scalars as the engine’s always do, where this crate’s Error counts UTF-16 code units (convert with Error::from). That tree is bounded at TREE_RULE_DEPTH open rules. Css::parse has none of these differences and no limit. With the engine’s recovery on, the parse returns a partial stylesheet, which is not always the canonical port’s: see doc/concepts.md.

let mut parser = tabnas_css::tabnas_jsonic::make();
parser.use_plugin(tabnas_css::plugin(), None).unwrap();
let ast = parser.parse("a { color: red }").unwrap();
assert_eq!(
    ast.to_json().to_string(),
    r#"{"type":"stylesheet","rules":[{"type":"rule","selectors":["a"],"declarations":[{"type":"declaration","property":"color","value":"red"}]}]}"#
);