//! This crate provides an OCamllex grammar for the [tree-sitter][] parsing library.
//!
//! Typically, you will use the [language][language func] function to add this
//! language to a tree-sitter [Parser][], and then use the parser to parse some
//! code:
//!
//! ```
//! let code = r#"
//!     rule main = parse
//!       | _ { "" }
//! "#;
//! let mut parser = tree_sitter::Parser::new();
//! parser
//!     .set_language(tree_sitter_ocamllex::language())
//!     .expect("Error loading OCamllex grammar");
//! let parsed = parser.parse(code, None);
//! ```
//!
//! [Language]: https://docs.rs/tree-sitter/*/tree_sitter/struct.Language.html
//! [language func]: fn.language.html
//! [Parser]: https://docs.rs/tree-sitter/*/tree_sitter/struct.Parser.html
//! [tree-sitter]: https://tree-sitter.github.io/

use tree_sitter::Language;

extern "C" {
    fn tree_sitter_ocamllex() -> Language;
}

/// Get the tree-sitter [Language][] for OCamllex.
///
/// [Language]: https://docs.rs/tree-sitter/*/tree_sitter/struct.Language.html
pub fn language() -> Language {
    unsafe { tree_sitter_ocamllex() }
}

/// The content of the [`node-types.json`][] file for OCamllex.
///
/// [`node-types.json`]: https://tree-sitter.github.io/tree-sitter/using-parsers#static-node-types
pub const NODE_TYPES: &'static str = include_str!("../../src/node-types.json");

/// The syntax highlighting query for OCamllex.
pub const HIGHLIGHTS_QUERY: &'static str = include_str!("../../queries/highlights.scm");

/// The injections query for OCaml.
pub const INJECTIONS_QUERY: &'static str = include_str!("../../queries/injections.scm");

#[cfg(test)]
mod tests {
    #[test]
    fn test_ocamllex() {
        let mut parser = tree_sitter::Parser::new();
        parser
            .set_language(super::language())
            .expect("Error loading OCamllex language");

        let code = r#"
            rule main = parse
              | _ { "" }
        "#;

        let tree = parser.parse(code, None).unwrap();
        let root = tree.root_node();
        assert!(!root.has_error());
    }
}