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Error builder

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This commit is contained in:
Aleksey Kladov 2018-01-07 10:55:43 +03:00
parent 50132db4c6
commit 8671a892c5
1 changed files with 28 additions and 1 deletions
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27
src/tree/file_builder.rs
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@ -5,6 +5,7 @@ pub trait Sink {
fn leaf(&mut self, kind: SyntaxKind, len: TextUnit); fn leaf(&mut self, kind: SyntaxKind, len: TextUnit);
fn start_internal(&mut self, kind: SyntaxKind); fn start_internal(&mut self, kind: SyntaxKind);
fn finish_internal(&mut self); fn finish_internal(&mut self);
fn error(&mut self) -> ErrorBuilder;
} }
@ -52,6 +53,10 @@ impl Sink for FileBuilder {
self.add_len(id); self.add_len(id);
} }
} }
fn error(&mut self) -> ErrorBuilder {
ErrorBuilder::new(self)
}
} }
impl FileBuilder { impl FileBuilder {
@ -133,3 +138,25 @@ fn grow(left: &mut TextRange, right: TextRange) {
assert_eq!(left.end(), right.start()); assert_eq!(left.end(), right.start());
*left = TextRange::from_to(left.start(), right.end()) *left = TextRange::from_to(left.start(), right.end())
} }
pub struct ErrorBuilder<'f> {
message: Option<String>,
builder: &'f mut FileBuilder
}
impl<'f> ErrorBuilder<'f> {
fn new(builder: &'f mut FileBuilder) -> Self {
ErrorBuilder { message: None, builder }
}
pub fn message<M: Into<String>>(mut self, m: M) -> Self {
self.message = Some(m.into());
self
}
pub fn build(self) {
let message = self.message.expect("Error message not set");
let node = self.builder.current_id();
self.builder.errors.push(SyntaxErrorData { node, message })
}
}