1 // Copyright 2016 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! This module contains utilities that work with the `CodeMap` from libsyntax / syntex_syntax.
12 //! This includes extension traits and methods for looking up spans and line ranges for AST nodes.
16 use syntax::codemap::{BytePos, CodeMap, FileMap, Span};
18 use comment::FindUncommented;
20 /// A range of lines in a file, inclusive of both ends.
21 pub struct LineRange {
22 pub file: Rc<FileMap>,
28 pub fn file_name(&self) -> &str {
37 fn span_after(&self, original: Span, needle: &str) -> BytePos;
38 fn span_after_last(&self, original: Span, needle: &str) -> BytePos;
39 fn span_before(&self, original: Span, needle: &str) -> BytePos;
42 pub trait LineRangeUtils {
43 /// Returns the `LineRange` that corresponds to `span` in `self`.
47 /// Panics if `span` crosses a file boundary, which shouldn't happen.
48 fn lookup_line_range(&self, span: Span) -> LineRange;
51 impl SpanUtils for CodeMap {
52 fn span_after(&self, original: Span, needle: &str) -> BytePos {
53 let snippet = self.span_to_snippet(original).unwrap();
54 let offset = snippet.find_uncommented(needle).unwrap() + needle.len();
56 original.lo + BytePos(offset as u32)
59 fn span_after_last(&self, original: Span, needle: &str) -> BytePos {
60 let snippet = self.span_to_snippet(original).unwrap();
63 while let Some(additional_offset) = snippet[offset..].find_uncommented(needle) {
64 offset += additional_offset + needle.len();
67 original.lo + BytePos(offset as u32)
70 fn span_before(&self, original: Span, needle: &str) -> BytePos {
71 let snippet = self.span_to_snippet(original).unwrap();
72 let offset = snippet.find_uncommented(needle).unwrap();
74 original.lo + BytePos(offset as u32)
78 impl LineRangeUtils for CodeMap {
79 fn lookup_line_range(&self, span: Span) -> LineRange {
80 let lo = self.lookup_char_pos(span.lo);
81 let hi = self.lookup_char_pos(span.hi);
83 assert!(lo.file.name == hi.file.name,
84 "span crossed file boundary: lo: {:?}, hi: {:?}",
89 file: lo.file.clone(),