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/*!
Frontend for [WGSL][wgsl] (WebGPU Shading Language).
*/
mod diagnostic_filter;
mod error;
mod index;
mod lower;
mod parse;
#[cfg(test)]
mod tests;
mod to_wgsl;
use crate::front::wgsl::error::Error;
use crate::front::wgsl::parse::Parser;
use thiserror::Error;
pub use crate::front::wgsl::error::ParseError;
use crate::front::wgsl::lower::Lowerer;
use crate::Scalar;
pub struct Frontend {
parser: Parser,
}
impl Frontend {
pub const fn new() -> Self {
Self {
parser: Parser::new(),
}
}
pub fn parse(&mut self, source: &str) -> Result<crate::Module, ParseError> {
self.inner(source).map_err(|x| x.as_parse_error(source))
}
fn inner<'a>(&mut self, source: &'a str) -> Result<crate::Module, Error<'a>> {
let tu = self.parser.parse(source)?;
let index = index::Index::generate(&tu)?;
let module = Lowerer::new(&index).lower(&tu)?;
Ok(module)
}
}
/// <div class="warning">
// NOTE: Keep this in sync with `wgpu::Device::create_shader_module`!
// NOTE: Keep this in sync with `wgpu_core::Global::device_create_shader_module`!
///
/// This function may consume a lot of stack space. Compiler-enforced limits for parsing recursion
/// exist; if shader compilation runs into them, it will return an error gracefully. However, on
/// some build profiles and platforms, the default stack size for a thread may be exceeded before
/// this limit is reached during parsing. Callers should ensure that there is enough stack space
/// for this, particularly if calls to this method are exposed to user input.
///
/// </div>
pub fn parse_str(source: &str) -> Result<crate::Module, ParseError> {
Frontend::new().parse(source)
}
#[cfg(test)]
#[track_caller]
pub fn assert_parse_err(input: &str, snapshot: &str) {
let output = parse_str(input)
.expect_err("expected parser error")
.emit_to_string(input);
if output != snapshot {
for diff in diff::lines(snapshot, &output) {
match diff {
diff::Result::Left(l) => println!("-{l}"),
diff::Result::Both(l, _) => println!(" {l}"),
diff::Result::Right(r) => println!("+{r}"),
}
}
panic!("Error snapshot failed");
}
}