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[glsl-in] Simplify control flow in search for main.

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This commit is contained in:
Jim Blandy 2022-04-30 16:22:10 -07:00 committed by João Capucho
parent 115a810981
commit fae939f537
1 changed files with 15 additions and 17 deletions
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32
src/front/glsl/parser.rs
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@ -38,7 +38,7 @@ impl<'source> ParsingContext<'source> {
/// Helper method for backtracking from a consumed token
///
/// This method should always be used instead of assigning to `backtracked_token` since
/// it validates that backtracking hasn't ocurred more than one time in a row
/// it validates that backtracking hasn't occurred more than one time in a row
///
/// # Panics
/// - If the parser already backtracked without bumping in between
@ -172,25 +172,23 @@ impl<'source> ParsingContext<'source> {
self.parse_external_declaration(parser, &mut ctx, &mut body)?;
}
match parser.lookup_function.get("main").and_then(|declaration| {
declaration
.overloads
.iter()
.find_map(|decl| match decl.kind {
FunctionKind::Call(handle) if decl.defined && decl.parameters.is_empty() => {
Some(handle)
// Add an `EntryPoint` to `parser.module` for `main`, if a
// suitable overload exists. Error out if we can't find one.
if let Some(declaration) = parser.lookup_function.get("main") {
for decl in declaration.overloads.iter() {
if let FunctionKind::Call(handle) = decl.kind {
if decl.defined && decl.parameters.is_empty() {
parser.add_entry_point(handle, body, ctx.expressions);
return Ok(());
}
_ => None,
})
}) {
Some(handle) => parser.add_entry_point(handle, body, ctx.expressions),
None => parser.errors.push(Error {
kind: ErrorKind::SemanticError("Missing entry point".into()),
meta: Span::default(),
}),
}
}
}
Ok(())
Err(Error {
kind: ErrorKind::SemanticError("Missing entry point".into()),
meta: Span::default(),
})
}
fn parse_uint_constant(&mut self, parser: &mut Parser) -> Result<(u32, Span)> {