glsl-lang is a crate implementing a LALR parser for the GLSL 4.x language,
with partial support for preprocessor directives. Its AST and features are
modeled after Dimitri Sabadie's glsl crate.
See the homepage for more detailed comparison elements.
```rust use glsl_lang::{ast, parse::Parse};
// Some GLSL source to parse let source = r#"void main() { gl_FragColor = vec4(1., 0.5, 0.25, 1.); }"#;
// Try parsing the source let ast = ast::TranslationUnit::parse(source); assert!(ast.is_ok()); ```
This crate has the following features:
- parser-expr: generate parser code for parsing GLSL expressions
- parser-statement: generate parser code for parsing GLSL statements
None of these features are enabled by default, as they significantly increase the compile
times. As an alternative, you may use the Parsable trait, which
wraps grammar rules in suitable source and matches the result to extract the part of the AST
we're interested in.
```rust // parse::Parse is not implemented for ast::Expr with the default features use glsl_lang::{ast, parse::Parsable};
let source = "a = b ? 1.0 : 0.0";
// Parse with Parsable::parse let ast = ast::Expr::parse(source); assert!(ast.is_ok()); ```
Vincent Tavernier vince.tavernier@gmail.com
BSD-3-Clause