textmate-scope-selector-peg

Performant port of the Textmate scope selector parser from JavaScript to Rust.

The original parser grammar (PegJS) lives at atom/first-mate.

Performance

selector.matches

The rust-peg parser was benchmarked for matching scopes against the following input:

• Selector: source.matlab -comment -entity -support -string -variable -interpolation -source.shell
• Match: source.matlab meta.class.matlab meta.class.declaration.matlab entity.name.type.class.matlab

The Rust crates parser produced speeds of $7.47ns/iter$, reduced from $31.8ns/iter$ in the peggy parser.

selector.get_prefix

The rust-peg parser was benchmarked for prefix matching against the following input:

• Selector: L:text.html.markdown - (comment, string, meta.paragraph.markdown, markup.*.block.markdown)
• Match: text.html.markdown meta.paragraph.markdown

The Rust crate's parser produced speeds of $19.78ns/iter$.