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Add opt_span_before() to SpanUtils trait

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With some refactorings to avoid duplicated code.
This commit is contained in:
Seiichi Uchida 2018-03-06 19:46:03 +09:00
parent 64d838490a
commit d316eba54d
1 changed files with 9 additions and 9 deletions
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18
src/codemap.rs
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@ -22,6 +22,7 @@ pub trait SpanUtils {
fn span_after_last(&self, original: Span, needle: &str) -> BytePos;
fn span_before(&self, original: Span, needle: &str) -> BytePos;
fn opt_span_after(&self, original: Span, needle: &str) -> Option<BytePos>;
fn opt_span_before(&self, original: Span, needle: &str) -> Option<BytePos>;
}
pub trait LineRangeUtils {
@ -35,10 +36,7 @@ pub trait LineRangeUtils {
impl<'a> SpanUtils for SnippetProvider<'a> {
fn span_after(&self, original: Span, needle: &str) -> BytePos {
let snippet = self.span_to_snippet(original).expect("Bad snippet");
let offset = snippet.find_uncommented(needle).expect("Bad offset") + needle.len();
original.lo() + BytePos(offset as u32)
self.opt_span_after(original, needle).expect("bad span")
}
fn span_after_last(&self, original: Span, needle: &str) -> BytePos {
@ -53,15 +51,17 @@ impl<'a> SpanUtils for SnippetProvider<'a> {
}
fn span_before(&self, original: Span, needle: &str) -> BytePos {
let snippet = self.span_to_snippet(original).unwrap();
let offset = snippet.find_uncommented(needle).unwrap();
original.lo() + BytePos(offset as u32)
self.opt_span_before(original, needle).expect("bad span")
}
fn opt_span_after(&self, original: Span, needle: &str) -> Option<BytePos> {
self.opt_span_before(original, needle)
.map(|bytepos| bytepos + BytePos(needle.len() as u32))
}
fn opt_span_before(&self, original: Span, needle: &str) -> Option<BytePos> {
let snippet = self.span_to_snippet(original)?;
let offset = snippet.find_uncommented(needle)? + needle.len();
let offset = snippet.find_uncommented(needle)?;
Some(original.lo() + BytePos(offset as u32))
}