91 lines
2.8 KiB
Rust
91 lines
2.8 KiB
Rust
// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! This module contains utilities that work with the `CodeMap` 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 std::rc::Rc;
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use syntax::codemap::{BytePos, CodeMap, FileMap, Span};
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use comment::FindUncommented;
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/// A range of lines in a file, inclusive of both ends.
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pub struct LineRange {
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pub file: Rc<FileMap>,
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pub lo: usize,
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pub hi: usize,
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}
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impl LineRange {
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pub fn file_name(&self) -> &str {
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self.file.as_ref().name.as_str()
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}
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}
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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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}
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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 SpanUtils for CodeMap {
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fn span_after(&self, original: Span, needle: &str) -> BytePos {
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let snippet = self.span_to_snippet(original).unwrap();
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let offset = snippet.find_uncommented(needle).unwrap() + needle.len();
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original.lo + BytePos(offset as u32)
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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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let snippet = self.span_to_snippet(original).unwrap();
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let offset = snippet.find_uncommented(needle).unwrap();
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original.lo + BytePos(offset as u32)
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}
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}
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impl LineRangeUtils for CodeMap {
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fn lookup_line_range(&self, span: Span) -> LineRange {
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let lo = self.lookup_char_pos(span.lo);
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let hi = self.lookup_char_pos(span.hi);
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assert!(lo.file.name == hi.file.name,
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"span crossed file boundary: lo: {:?}, hi: {:?}",
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lo,
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hi);
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LineRange {
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file: lo.file.clone(),
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lo: lo.line,
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hi: hi.line,
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}
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}
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}
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