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Remove generate_fn_name_span and generate_local_type_param_snippet.

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This commit is contained in:
Camille GILLOT 2022-07-14 17:28:34 +02:00
parent 362e6361d0
commit 6e88d738be
1 changed files with 0 additions and 87 deletions
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87
compiler/rustc_span/src/source_map.rs
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@ -982,93 +982,6 @@ impl SourceMap {
self.files().iter().fold(0, |a, f| a + f.count_lines())
}
pub fn generate_fn_name_span(&self, span: Span) -> Option<Span> {
let prev_span = self.span_extend_to_prev_str(span, "fn", true, true)?;
if let Ok(snippet) = self.span_to_snippet(prev_span) {
debug!(
"generate_fn_name_span: span={:?}, prev_span={:?}, snippet={:?}",
span, prev_span, snippet
);
if snippet.is_empty() {
return None;
};
let len = snippet
.find(|c: char| !c.is_alphanumeric() && c != '_')
.expect("no label after fn");
Some(prev_span.with_hi(BytePos(prev_span.lo().0 + len as u32)))
} else {
None
}
}
/// Takes the span of a type parameter in a function signature and try to generate a span for
/// the function name (with generics) and a new snippet for this span with the pointed type
/// parameter as a new local type parameter.
///
/// For instance:
/// ```rust,ignore (pseudo-Rust)
/// // Given span
/// fn my_function(param: T)
/// // ^ Original span
///
/// // Result
/// fn my_function(param: T)
/// // ^^^^^^^^^^^ Generated span with snippet `my_function<T>`
/// ```
///
/// Attention: The method used is very fragile since it essentially duplicates the work of the
/// parser. If you need to use this function or something similar, please consider updating the
/// `SourceMap` functions and this function to something more robust.
pub fn generate_local_type_param_snippet(&self, span: Span) -> Option<(Span, String)> {
// Try to extend the span to the previous "fn" keyword to retrieve the function
// signature.
if let Some(sugg_span) = self.span_extend_to_prev_str(span, "fn", false, true) {
if let Ok(snippet) = self.span_to_snippet(sugg_span) {
// Consume the function name.
let mut offset = snippet
.find(|c: char| !c.is_alphanumeric() && c != '_')
.expect("no label after fn");
// Consume the generics part of the function signature.
let mut bracket_counter = 0;
let mut last_char = None;
for c in snippet[offset..].chars() {
match c {
'<' => bracket_counter += 1,
'>' => bracket_counter -= 1,
'(' => {
if bracket_counter == 0 {
break;
}
}
_ => {}
}
offset += c.len_utf8();
last_char = Some(c);
}
// Adjust the suggestion span to encompass the function name with its generics.
let sugg_span = sugg_span.with_hi(BytePos(sugg_span.lo().0 + offset as u32));
// Prepare the new suggested snippet to append the type parameter that triggered
// the error in the generics of the function signature.
let mut new_snippet = if last_char == Some('>') {
format!("{}, ", &snippet[..(offset - '>'.len_utf8())])
} else {
format!("{}<", &snippet[..offset])
};
new_snippet
.push_str(&self.span_to_snippet(span).unwrap_or_else(|_| "T".to_string()));
new_snippet.push('>');
return Some((sugg_span, new_snippet));
}
}
None
}
pub fn ensure_source_file_source_present(&self, source_file: Lrc<SourceFile>) -> bool {
source_file.add_external_src(|| {
match source_file.name {