90 lines
3 KiB
Rust
90 lines
3 KiB
Rust
//! This module contains utilities that work with the `SourceMap` from `libsyntax`/`syntex_syntax`.
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//! This includes extension traits and methods for looking up spans and line ranges for AST nodes.
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use syntax::source_map::{BytePos, SourceMap, Span};
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use crate::comment::FindUncommented;
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use crate::config::file_lines::LineRange;
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use crate::visitor::SnippetProvider;
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pub trait SpanUtils {
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fn span_after(&self, original: Span, needle: &str) -> BytePos;
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fn span_after_last(&self, original: Span, needle: &str) -> BytePos;
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fn span_before(&self, original: Span, needle: &str) -> BytePos;
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fn opt_span_after(&self, original: Span, needle: &str) -> Option<BytePos>;
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fn opt_span_before(&self, original: Span, needle: &str) -> Option<BytePos>;
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}
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pub trait LineRangeUtils {
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/// Returns the `LineRange` that corresponds to `span` in `self`.
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///
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/// # Panics
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///
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/// Panics if `span` crosses a file boundary, which shouldn't happen.
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fn lookup_line_range(&self, span: Span) -> LineRange;
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}
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impl<'a> SpanUtils for SnippetProvider<'a> {
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fn span_after(&self, original: Span, needle: &str) -> BytePos {
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self.opt_span_after(original, needle).unwrap_or_else(|| {
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panic!(
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"bad span: `{}`: `{}`",
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needle,
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self.span_to_snippet(original).unwrap()
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)
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})
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}
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fn span_after_last(&self, original: Span, needle: &str) -> BytePos {
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let snippet = self.span_to_snippet(original).unwrap();
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let mut offset = 0;
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while let Some(additional_offset) = snippet[offset..].find_uncommented(needle) {
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offset += additional_offset + needle.len();
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}
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original.lo() + BytePos(offset as u32)
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}
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fn span_before(&self, original: Span, needle: &str) -> BytePos {
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self.opt_span_before(original, needle).unwrap_or_else(|| {
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panic!(
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"bad span: `{}`: `{}`",
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needle,
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self.span_to_snippet(original).unwrap()
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)
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})
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}
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fn opt_span_after(&self, original: Span, needle: &str) -> Option<BytePos> {
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self.opt_span_before(original, needle)
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.map(|bytepos| bytepos + BytePos(needle.len() as u32))
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}
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fn opt_span_before(&self, original: Span, needle: &str) -> Option<BytePos> {
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let snippet = self.span_to_snippet(original)?;
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let offset = snippet.find_uncommented(needle)?;
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Some(original.lo() + BytePos(offset as u32))
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}
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}
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impl LineRangeUtils for SourceMap {
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fn lookup_line_range(&self, span: Span) -> LineRange {
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let lo = self.lookup_line(span.lo()).unwrap();
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let hi = self.lookup_line(span.hi()).unwrap();
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debug_assert_eq!(
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lo.sf.name, hi.sf.name,
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"span crossed file boundary: lo: {:?}, hi: {:?}",
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lo, hi
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);
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// Line numbers start at 1
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LineRange {
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file: lo.sf.clone(),
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lo: lo.line + 1,
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hi: hi.line + 1,
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}
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}
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}
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