mirror of
https://github.com/swc-project/swc.git
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1374 lines
47 KiB
Rust
1374 lines
47 KiB
Rust
// Copyright 2012 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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//! The SourceMap tracks all the source code used within a single crate, mapping
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//! from integer byte positions to the original source code location. Each bit
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//! of source parsed during crate parsing (typically files, in-memory strings,
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//! or various bits of macro expansion) cover a continuous range of bytes in the
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//! SourceMap and are represented by SourceFiles. Byte positions are stored in
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//! `spans` and used pervasively in the compiler. They are absolute positions
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//! within the SourceMap, which upon request can be converted to line and column
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//! information, source code snippets, etc.
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pub use crate::syntax_pos::*;
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use crate::{
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errors::SourceMapper,
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rustc_data_structures::stable_hasher::StableHasher,
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sync::{Lock, LockGuard, MappedLockGuard},
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};
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use log::debug;
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use sourcemap::SourceMapBuilder;
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use std::{
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cmp,
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cmp::{max, min},
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collections::HashMap,
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env, fs,
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hash::Hash,
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io::{self, Read},
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path::{Path, PathBuf},
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sync::{
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atomic::{AtomicUsize, Ordering::SeqCst},
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Arc,
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},
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};
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// _____________________________________________________________________________
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// SourceFile, MultiByteChar, FileName, FileLines
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//
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/// An abstraction over the fs operations used by the Parser.
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pub trait FileLoader {
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/// Query the existence of a file.
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fn file_exists(&self, path: &Path) -> bool;
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/// Return an absolute path to a file, if possible.
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fn abs_path(&self, path: &Path) -> Option<PathBuf>;
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/// Read the contents of an UTF-8 file into memory.
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fn read_file(&self, path: &Path) -> io::Result<String>;
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}
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/// A FileLoader that uses std::fs to load real files.
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pub struct RealFileLoader;
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impl FileLoader for RealFileLoader {
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fn file_exists(&self, path: &Path) -> bool {
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fs::metadata(path).is_ok()
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}
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fn abs_path(&self, path: &Path) -> Option<PathBuf> {
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if path.is_absolute() {
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Some(path.to_path_buf())
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} else {
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env::current_dir().ok().map(|cwd| cwd.join(path))
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}
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}
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fn read_file(&self, path: &Path) -> io::Result<String> {
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let mut src = String::new();
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fs::File::open(path)?.read_to_string(&mut src)?;
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Ok(src)
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}
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}
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// This is a SourceFile identifier that is used to correlate SourceFiles between
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// subsequent compilation sessions (which is something we need to do during
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// incremental compilation).
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#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
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pub struct StableSourceFileId(u128);
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impl StableSourceFileId {
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pub fn new(source_file: &SourceFile) -> StableSourceFileId {
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let mut hasher = StableHasher::new();
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source_file.name.hash(&mut hasher);
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source_file.name_was_remapped.hash(&mut hasher);
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source_file.unmapped_path.hash(&mut hasher);
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StableSourceFileId(hasher.finish())
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}
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}
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// _____________________________________________________________________________
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// SourceMap
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//
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#[derive(Default)]
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pub(super) struct SourceMapFiles {
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pub(super) source_files: Vec<Arc<SourceFile>>,
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stable_id_to_source_file: HashMap<StableSourceFileId, Arc<SourceFile>>,
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}
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pub struct SourceMap {
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pub(super) files: Lock<SourceMapFiles>,
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start_pos: AtomicUsize,
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file_loader: Box<dyn FileLoader + Sync + Send>,
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// This is used to apply the file path remapping as specified via
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// --remap-path-prefix to all SourceFiles allocated within this SourceMap.
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path_mapping: FilePathMapping,
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/// In case we are in a doctest, replace all file names with the PathBuf,
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/// and add the given offsets to the line info
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doctest_offset: Option<(FileName, isize)>,
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}
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impl Default for SourceMap {
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fn default() -> Self {
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Self::new(FilePathMapping::empty())
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}
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}
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impl SourceMap {
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pub fn new(path_mapping: FilePathMapping) -> SourceMap {
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SourceMap {
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files: Default::default(),
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start_pos: Default::default(),
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file_loader: Box::new(RealFileLoader),
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path_mapping,
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doctest_offset: None,
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}
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}
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pub fn with_file_loader(
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file_loader: Box<dyn FileLoader + Sync + Send>,
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path_mapping: FilePathMapping,
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) -> SourceMap {
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SourceMap {
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files: Default::default(),
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start_pos: Default::default(),
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file_loader,
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path_mapping,
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doctest_offset: None,
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}
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}
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pub fn path_mapping(&self) -> &FilePathMapping {
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&self.path_mapping
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}
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pub fn file_exists(&self, path: &Path) -> bool {
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self.file_loader.file_exists(path)
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}
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pub fn load_file(&self, path: &Path) -> io::Result<Arc<SourceFile>> {
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let src = self.file_loader.read_file(path)?;
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let filename = path.to_owned().into();
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Ok(self.new_source_file(filename, src))
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}
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pub fn files(&self) -> MappedLockGuard<'_, Vec<Arc<SourceFile>>> {
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LockGuard::map(self.files.borrow(), |files| &mut files.source_files)
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}
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pub fn source_file_by_stable_id(
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&self,
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stable_id: StableSourceFileId,
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) -> Option<Arc<SourceFile>> {
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self.files
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.borrow()
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.stable_id_to_source_file
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.get(&stable_id)
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.cloned()
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}
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fn next_start_pos(&self, len: usize) -> usize {
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// Add one so there is some space between files. This lets us distinguish
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// positions in the source_map, even in the presence of zero-length files.
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self.start_pos.fetch_add(len + 1, SeqCst)
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}
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/// Creates a new source_file.
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/// This does not ensure that only one SourceFile exists per file name.
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pub fn new_source_file(&self, filename: FileName, src: String) -> Arc<SourceFile> {
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// The path is used to determine the directory for loading submodules and
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// include files, so it must be before remapping.
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// Note that filename may not be a valid path, eg it may be `<anon>` etc,
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// but this is okay because the directory determined by `path.pop()` will
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// be empty, so the working directory will be used.
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let unmapped_path = filename.clone();
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let (filename, was_remapped) = match filename {
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FileName::Real(filename) => {
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let (filename, was_remapped) = self.path_mapping.map_prefix(filename);
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(FileName::Real(filename), was_remapped)
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}
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other => (other, false),
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};
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// We hold lock at here to prevent panic
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// If we don't do this, lookup_char_pos and its family **may** panic.
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let mut files = self.files.borrow_mut();
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let start_pos = self.next_start_pos(src.len());
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let source_file = Arc::new(SourceFile::new(
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filename,
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was_remapped,
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unmapped_path,
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src,
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Pos::from_usize(start_pos),
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));
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{
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files.source_files.push(source_file.clone());
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files
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.stable_id_to_source_file
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.insert(StableSourceFileId::new(&source_file), source_file.clone());
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}
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source_file
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}
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pub fn mk_substr_filename(&self, sp: Span) -> String {
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let pos = self.lookup_char_pos(sp.lo());
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format!(
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"<{}:{}:{}>",
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pos.file.name,
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pos.line,
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pos.col.to_usize() + 1
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)
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}
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// If there is a doctest_offset, apply it to the line
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pub fn doctest_offset_line(&self, mut orig: usize) -> usize {
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if let Some((_, line)) = self.doctest_offset {
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if line >= 0 {
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orig += line as usize;
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} else {
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orig -= (-line) as usize;
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}
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}
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orig
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}
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/// Lookup source information about a BytePos
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pub fn lookup_char_pos(&self, pos: BytePos) -> Loc {
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let fm = self.lookup_source_file(pos);
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self.lookup_char_pos_with(fm, pos)
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}
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/// Lookup source information about a BytePos
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///
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///
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/// This method exists only for optimization and it's not part of public
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/// api.
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#[doc(hidden)]
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pub fn lookup_char_pos_with(&self, fm: Arc<SourceFile>, pos: BytePos) -> Loc {
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let line_info = self.lookup_line_with(fm, pos);
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match line_info {
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Ok(SourceFileAndLine { sf: f, line: a }) => {
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let chpos = self.bytepos_to_file_charpos_with(&f, pos);
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let line = a + 1; // Line numbers start at 1
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let linebpos = f.lines[a];
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assert!(
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pos >= linebpos,
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"{}: bpos = {:?}; linebpos = {:?};",
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f.name,
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pos,
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linebpos,
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);
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let linechpos = self.bytepos_to_file_charpos_with(&f, linebpos);
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let col = max(chpos, linechpos) - min(chpos, linechpos);
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let col_display = {
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let start_width_idx = f
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.non_narrow_chars
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.binary_search_by_key(&linebpos, |x| x.pos())
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.unwrap_or_else(|x| x);
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let end_width_idx = f
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.non_narrow_chars
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.binary_search_by_key(&pos, |x| x.pos())
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.unwrap_or_else(|x| x);
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let special_chars = end_width_idx - start_width_idx;
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let non_narrow: usize = f.non_narrow_chars[start_width_idx..end_width_idx]
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.iter()
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.map(|x| x.width())
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.sum();
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col.0 - special_chars + non_narrow
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};
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debug!(
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"byte pos {:?} is on the line at byte pos {:?}",
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pos, linebpos
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);
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debug!(
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"char pos {:?} is on the line at char pos {:?}",
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chpos, linechpos
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);
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debug!("byte is on line: {}", line);
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// assert!(chpos >= linechpos);
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Loc {
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file: f,
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line,
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col,
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col_display,
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}
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}
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Err(f) => {
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let chpos = self.bytepos_to_file_charpos(pos);
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let col_display = {
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let end_width_idx = f
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.non_narrow_chars
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.binary_search_by_key(&pos, |x| x.pos())
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.unwrap_or_else(|x| x);
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let non_narrow: usize = f.non_narrow_chars[0..end_width_idx]
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.iter()
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.map(|x| x.width())
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.sum();
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chpos.0 - end_width_idx + non_narrow
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};
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Loc {
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file: f,
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line: 0,
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col: chpos,
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col_display,
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}
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}
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}
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}
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/// If the relevant source_file is empty, we don't return a line number.
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pub fn lookup_line(&self, pos: BytePos) -> Result<SourceFileAndLine, Arc<SourceFile>> {
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let f = self.lookup_source_file(pos);
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self.lookup_line_with(f, pos)
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}
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/// If the relevant source_file is empty, we don't return a line number.
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///
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/// This method exists only for optimization and it's not part of public
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/// api.
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#[doc(hidden)]
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pub fn lookup_line_with(
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&self,
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f: Arc<SourceFile>,
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pos: BytePos,
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) -> Result<SourceFileAndLine, Arc<SourceFile>> {
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match f.lookup_line(pos) {
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Some(line) => Ok(SourceFileAndLine { sf: f, line }),
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None => Err(f),
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}
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}
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pub fn lookup_char_pos_adj(&self, pos: BytePos) -> LocWithOpt {
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let loc = self.lookup_char_pos(pos);
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LocWithOpt {
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filename: loc.file.name.clone(),
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line: loc.line,
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col: loc.col,
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file: Some(loc.file),
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}
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}
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/// Returns `Some(span)`, a union of the lhs and rhs span. The lhs must
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/// precede the rhs. If there are gaps between lhs and rhs, the
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/// resulting union will cross these gaps. For this to work, the spans
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/// have to be:
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///
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/// * the ctxt of both spans much match
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/// * the lhs span needs to end on the same line the rhs span begins
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/// * the lhs span must start at or before the rhs span
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pub fn merge_spans(&self, sp_lhs: Span, sp_rhs: Span) -> Option<Span> {
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// make sure we're at the same expansion id
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if sp_lhs.ctxt() != sp_rhs.ctxt() {
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return None;
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}
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let lhs_end = match self.lookup_line(sp_lhs.hi()) {
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Ok(x) => x,
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Err(_) => return None,
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};
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let rhs_begin = match self.lookup_line(sp_rhs.lo()) {
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Ok(x) => x,
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Err(_) => return None,
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};
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// if we must cross lines to merge, don't merge
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if lhs_end.line != rhs_begin.line {
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return None;
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}
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// ensure these follow the expected order and we don't overlap
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if (sp_lhs.lo() <= sp_rhs.lo()) && (sp_lhs.hi() <= sp_rhs.lo()) {
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Some(sp_lhs.to(sp_rhs))
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} else {
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None
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}
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}
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pub fn span_to_string(&self, sp: Span) -> String {
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if self.files.borrow().source_files.is_empty() && sp.is_dummy() {
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return "no-location".to_string();
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}
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let lo = self.lookup_char_pos_adj(sp.lo());
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let hi = self.lookup_char_pos_adj(sp.hi());
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format!(
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"{}:{}:{}: {}:{}",
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lo.filename,
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lo.line,
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lo.col.to_usize() + 1,
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hi.line,
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hi.col.to_usize() + 1
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)
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}
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pub fn span_to_filename(&self, sp: Span) -> FileName {
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self.lookup_char_pos(sp.lo()).file.name.clone()
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}
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pub fn span_to_unmapped_path(&self, sp: Span) -> FileName {
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self.lookup_char_pos(sp.lo())
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.file
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.unmapped_path
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.clone()
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.expect("SourceMap::span_to_unmapped_path called for imported SourceFile?")
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}
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pub fn is_multiline(&self, sp: Span) -> bool {
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let lo = self.lookup_char_pos(sp.lo());
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let hi = self.lookup_char_pos(sp.hi());
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lo.line != hi.line
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}
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pub fn span_to_lines(&self, sp: Span) -> FileLinesResult {
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debug!("span_to_lines(sp={:?})", sp);
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if sp.lo() > sp.hi() {
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return Err(SpanLinesError::IllFormedSpan(sp));
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}
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let lo = self.lookup_char_pos(sp.lo());
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debug!("span_to_lines: lo={:?}", lo);
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let hi = self.lookup_char_pos(sp.hi());
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debug!("span_to_lines: hi={:?}", hi);
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if lo.file.start_pos != hi.file.start_pos {
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return Err(SpanLinesError::DistinctSources(DistinctSources {
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begin: (lo.file.name.clone(), lo.file.start_pos),
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end: (hi.file.name.clone(), hi.file.start_pos),
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}));
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}
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assert!(hi.line >= lo.line);
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let mut lines = Vec::with_capacity(hi.line - lo.line + 1);
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// The span starts partway through the first line,
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// but after that it starts from offset 0.
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let mut start_col = lo.col;
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// For every line but the last, it extends from `start_col`
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// and to the end of the line. Be careful because the line
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// numbers in Loc are 1-based, so we subtract 1 to get 0-based
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// lines.
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for line_index in lo.line - 1..hi.line - 1 {
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let line_len = lo
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.file
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.get_line(line_index)
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.map(|s| s.chars().count())
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.unwrap_or(0);
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lines.push(LineInfo {
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line_index,
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start_col,
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end_col: CharPos::from_usize(line_len),
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});
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start_col = CharPos::from_usize(0);
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}
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// For the last line, it extends from `start_col` to `hi.col`:
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lines.push(LineInfo {
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line_index: hi.line - 1,
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start_col,
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end_col: hi.col,
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});
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Ok(FileLines {
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file: lo.file,
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lines,
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})
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}
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|
|
/// Extract the source surrounding the given `Span` using the
|
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/// `extract_source` function. The extract function takes three
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/// arguments: a string slice containing the source, an index in
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/// the slice for the beginning of the span and an index in the slice for
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/// the end of the span.
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fn span_to_source<F>(&self, sp: Span, extract_source: F) -> Result<String, SpanSnippetError>
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where
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F: Fn(&str, usize, usize) -> String,
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|
{
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if sp.lo() > sp.hi() {
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return Err(SpanSnippetError::IllFormedSpan(sp));
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}
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|
|
|
let local_begin = self.lookup_byte_offset(sp.lo());
|
|
let local_end = self.lookup_byte_offset(sp.hi());
|
|
|
|
if local_begin.sf.start_pos != local_end.sf.start_pos {
|
|
Err(SpanSnippetError::DistinctSources(DistinctSources {
|
|
begin: (local_begin.sf.name.clone(), local_begin.sf.start_pos),
|
|
end: (local_end.sf.name.clone(), local_end.sf.start_pos),
|
|
}))
|
|
} else {
|
|
let start_index = local_begin.pos.to_usize();
|
|
let end_index = local_end.pos.to_usize();
|
|
let source_len = (local_begin.sf.end_pos - local_begin.sf.start_pos).to_usize();
|
|
|
|
if start_index > end_index || end_index > source_len {
|
|
return Err(SpanSnippetError::MalformedForSourcemap(
|
|
MalformedSourceMapPositions {
|
|
name: local_begin.sf.name.clone(),
|
|
source_len,
|
|
begin_pos: local_begin.pos,
|
|
end_pos: local_end.pos,
|
|
},
|
|
));
|
|
}
|
|
|
|
let src = &local_begin.sf.src;
|
|
Ok(extract_source(src, start_index, end_index))
|
|
}
|
|
}
|
|
|
|
/// Return the source snippet as `String` corresponding to the given `Span`
|
|
pub fn span_to_snippet(&self, sp: Span) -> Result<String, SpanSnippetError> {
|
|
self.span_to_source(sp, |src, start_index, end_index| {
|
|
src[start_index..end_index].to_string()
|
|
})
|
|
}
|
|
|
|
pub fn span_to_margin(&self, sp: Span) -> Option<usize> {
|
|
match self.span_to_prev_source(sp) {
|
|
Err(_) => None,
|
|
Ok(source) => source
|
|
.split('\n')
|
|
.last()
|
|
.map(|last_line| last_line.len() - last_line.trim_start().len()),
|
|
}
|
|
}
|
|
|
|
/// Return the source snippet as `String` before the given `Span`
|
|
pub fn span_to_prev_source(&self, sp: Span) -> Result<String, SpanSnippetError> {
|
|
self.span_to_source(sp, |src, start_index, _| src[..start_index].to_string())
|
|
}
|
|
|
|
/// Extend the given `Span` to just after the previous occurrence of `c`.
|
|
/// Return the same span if no character could be found or if an error
|
|
/// occurred while retrieving the code snippet.
|
|
pub fn span_extend_to_prev_char(&self, sp: Span, c: char) -> Span {
|
|
if let Ok(prev_source) = self.span_to_prev_source(sp) {
|
|
let prev_source = prev_source.rsplit(c).nth(0).unwrap_or("").trim_start();
|
|
if !prev_source.is_empty() && !prev_source.contains('\n') {
|
|
return sp.with_lo(BytePos(sp.lo().0 - prev_source.len() as u32));
|
|
}
|
|
}
|
|
|
|
sp
|
|
}
|
|
|
|
/// Extend the given `Span` to just after the previous occurrence of `pat`
|
|
/// when surrounded by whitespace. Return the same span if no character
|
|
/// could be found or if an error occurred while retrieving the code
|
|
/// snippet.
|
|
pub fn span_extend_to_prev_str(&self, sp: Span, pat: &str, accept_newlines: bool) -> Span {
|
|
// assure that the pattern is delimited, to avoid the following
|
|
// fn my_fn()
|
|
// ^^^^ returned span without the check
|
|
// ---------- correct span
|
|
for ws in &[" ", "\t", "\n"] {
|
|
let pat = pat.to_owned() + ws;
|
|
if let Ok(prev_source) = self.span_to_prev_source(sp) {
|
|
let prev_source = prev_source.rsplit(&pat).nth(0).unwrap_or("").trim_start();
|
|
if !prev_source.is_empty() && (!prev_source.contains('\n') || accept_newlines) {
|
|
return sp.with_lo(BytePos(sp.lo().0 - prev_source.len() as u32));
|
|
}
|
|
}
|
|
}
|
|
|
|
sp
|
|
}
|
|
|
|
/// Given a `Span`, try to get a shorter span ending before the first
|
|
/// occurrence of `c` `char`
|
|
pub fn span_until_char(&self, sp: Span, c: char) -> Span {
|
|
match self.span_to_snippet(sp) {
|
|
Ok(snippet) => {
|
|
let snippet = snippet.split(c).nth(0).unwrap_or("").trim_end();
|
|
if !snippet.is_empty() && !snippet.contains('\n') {
|
|
sp.with_hi(BytePos(sp.lo().0 + snippet.len() as u32))
|
|
} else {
|
|
sp
|
|
}
|
|
}
|
|
_ => sp,
|
|
}
|
|
}
|
|
|
|
/// Given a `Span`, try to get a shorter span ending just after the first
|
|
/// occurrence of `char` `c`.
|
|
pub fn span_through_char(&self, sp: Span, c: char) -> Span {
|
|
if let Ok(snippet) = self.span_to_snippet(sp) {
|
|
if let Some(offset) = snippet.find(c) {
|
|
return sp.with_hi(BytePos(sp.lo().0 + (offset + c.len_utf8()) as u32));
|
|
}
|
|
}
|
|
sp
|
|
}
|
|
|
|
/// Given a `Span`, get a new `Span` covering the first token and all its
|
|
/// trailing whitespace or the original `Span`.
|
|
///
|
|
/// If `sp` points to `"let mut x"`, then a span pointing at `"let "` will
|
|
/// be returned.
|
|
pub fn span_until_non_whitespace(&self, sp: Span) -> Span {
|
|
let mut whitespace_found = false;
|
|
|
|
self.span_take_while(sp, |c| {
|
|
if !whitespace_found && c.is_whitespace() {
|
|
whitespace_found = true;
|
|
}
|
|
|
|
!(whitespace_found && !c.is_whitespace())
|
|
})
|
|
}
|
|
|
|
/// Given a `Span`, get a new `Span` covering the first token without its
|
|
/// trailing whitespace or the original `Span` in case of error.
|
|
///
|
|
/// If `sp` points to `"let mut x"`, then a span pointing at `"let"` will be
|
|
/// returned.
|
|
pub fn span_until_whitespace(&self, sp: Span) -> Span {
|
|
self.span_take_while(sp, |c| !c.is_whitespace())
|
|
}
|
|
|
|
/// Given a `Span`, get a shorter one until `predicate` yields false.
|
|
pub fn span_take_while<P>(&self, sp: Span, predicate: P) -> Span
|
|
where
|
|
P: for<'r> FnMut(&'r char) -> bool,
|
|
{
|
|
if let Ok(snippet) = self.span_to_snippet(sp) {
|
|
let offset = snippet
|
|
.chars()
|
|
.take_while(predicate)
|
|
.map(|c| c.len_utf8())
|
|
.sum::<usize>();
|
|
|
|
sp.with_hi(BytePos(sp.lo().0 + (offset as u32)))
|
|
} else {
|
|
sp
|
|
}
|
|
}
|
|
|
|
pub fn def_span(&self, sp: Span) -> Span {
|
|
self.span_until_char(sp, '{')
|
|
}
|
|
|
|
/// Returns a new span representing just the start-point of this span
|
|
pub fn start_point(&self, sp: Span) -> Span {
|
|
let pos = sp.lo().0;
|
|
let width = self.find_width_of_character_at_span(sp, false);
|
|
let corrected_start_position = pos.checked_add(width).unwrap_or(pos);
|
|
let end_point = BytePos(cmp::max(corrected_start_position, sp.lo().0));
|
|
sp.with_hi(end_point)
|
|
}
|
|
|
|
/// Returns a new span representing just the end-point of this span
|
|
pub fn end_point(&self, sp: Span) -> Span {
|
|
let pos = sp.hi().0;
|
|
|
|
let width = self.find_width_of_character_at_span(sp, false);
|
|
let corrected_end_position = pos.checked_sub(width).unwrap_or(pos);
|
|
|
|
let end_point = BytePos(cmp::max(corrected_end_position, sp.lo().0));
|
|
sp.with_lo(end_point)
|
|
}
|
|
|
|
/// Returns a new span representing the next character after the end-point
|
|
/// of this span
|
|
pub fn next_point(&self, sp: Span) -> Span {
|
|
let start_of_next_point = sp.hi().0;
|
|
|
|
let width = self.find_width_of_character_at_span(sp, true);
|
|
// If the width is 1, then the next span should point to the same `lo` and `hi`.
|
|
// However, in the case of a multibyte character, where the width != 1,
|
|
// the next span should span multiple bytes to include the whole
|
|
// character.
|
|
let end_of_next_point = start_of_next_point
|
|
.checked_add(width - 1)
|
|
.unwrap_or(start_of_next_point);
|
|
|
|
let end_of_next_point = BytePos(cmp::max(sp.lo().0 + 1, end_of_next_point));
|
|
Span::new(BytePos(start_of_next_point), end_of_next_point, sp.ctxt())
|
|
}
|
|
|
|
/// Finds the width of a character, either before or after the provided
|
|
/// span.
|
|
fn find_width_of_character_at_span(&self, sp: Span, forwards: bool) -> u32 {
|
|
// Disregard malformed spans and assume a one-byte wide character.
|
|
if sp.lo() >= sp.hi() {
|
|
debug!("find_width_of_character_at_span: early return malformed span");
|
|
return 1;
|
|
}
|
|
|
|
let local_begin = self.lookup_byte_offset(sp.lo());
|
|
let local_end = self.lookup_byte_offset(sp.hi());
|
|
debug!(
|
|
"find_width_of_character_at_span: local_begin=`{:?}`, local_end=`{:?}`",
|
|
local_begin, local_end
|
|
);
|
|
|
|
let start_index = local_begin.pos.to_usize();
|
|
let end_index = local_end.pos.to_usize();
|
|
debug!(
|
|
"find_width_of_character_at_span: start_index=`{:?}`, end_index=`{:?}`",
|
|
start_index, end_index
|
|
);
|
|
|
|
// Disregard indexes that are at the start or end of their spans, they can't fit
|
|
// bigger characters.
|
|
if (!forwards && end_index == usize::min_value())
|
|
|| (forwards && start_index == usize::max_value())
|
|
{
|
|
debug!("find_width_of_character_at_span: start or end of span, cannot be multibyte");
|
|
return 1;
|
|
}
|
|
|
|
let source_len = (local_begin.sf.end_pos - local_begin.sf.start_pos).to_usize();
|
|
debug!(
|
|
"find_width_of_character_at_span: source_len=`{:?}`",
|
|
source_len
|
|
);
|
|
// Ensure indexes are also not malformed.
|
|
if start_index > end_index || end_index > source_len {
|
|
debug!("find_width_of_character_at_span: source indexes are malformed");
|
|
return 1;
|
|
}
|
|
|
|
// We need to extend the snippet to the end of the src rather than to end_index
|
|
// so when searching forwards for boundaries we've got somewhere to
|
|
// search.
|
|
let src = &local_begin.sf.src;
|
|
let snippet = {
|
|
let len = src.len();
|
|
&src[start_index..len]
|
|
};
|
|
debug!("find_width_of_character_at_span: snippet=`{:?}`", snippet);
|
|
|
|
let mut target = if forwards {
|
|
end_index + 1
|
|
} else {
|
|
end_index - 1
|
|
};
|
|
debug!(
|
|
"find_width_of_character_at_span: initial target=`{:?}`",
|
|
target
|
|
);
|
|
|
|
while !snippet.is_char_boundary(target - start_index) && target < source_len {
|
|
target = if forwards {
|
|
target + 1
|
|
} else {
|
|
match target.checked_sub(1) {
|
|
Some(target) => target,
|
|
None => {
|
|
break;
|
|
}
|
|
}
|
|
};
|
|
debug!("find_width_of_character_at_span: target=`{:?}`", target);
|
|
}
|
|
debug!(
|
|
"find_width_of_character_at_span: final target=`{:?}`",
|
|
target
|
|
);
|
|
|
|
if forwards {
|
|
(target - end_index) as u32
|
|
} else {
|
|
(end_index - target) as u32
|
|
}
|
|
}
|
|
|
|
pub fn get_source_file(&self, filename: &FileName) -> Option<Arc<SourceFile>> {
|
|
for sf in self.files.borrow().source_files.iter() {
|
|
if *filename == sf.name {
|
|
return Some(sf.clone());
|
|
}
|
|
}
|
|
None
|
|
}
|
|
|
|
/// For a global BytePos compute the local offset within the containing
|
|
/// SourceFile
|
|
pub fn lookup_byte_offset(&self, bpos: BytePos) -> SourceFileAndBytePos {
|
|
let sf = self.lookup_source_file(bpos);
|
|
let offset = bpos - sf.start_pos;
|
|
SourceFileAndBytePos { sf, pos: offset }
|
|
}
|
|
|
|
/// Converts an absolute BytePos to a CharPos relative to the source_file.
|
|
fn bytepos_to_file_charpos(&self, bpos: BytePos) -> CharPos {
|
|
let map = self.lookup_source_file(bpos);
|
|
|
|
self.bytepos_to_file_charpos_with(&map, bpos)
|
|
}
|
|
|
|
fn bytepos_to_file_charpos_with(&self, map: &SourceFile, bpos: BytePos) -> CharPos {
|
|
let total_extra_bytes = self.calc_extra_bytes(map, &mut 0, bpos);
|
|
assert!(
|
|
map.start_pos.to_u32() + total_extra_bytes <= bpos.to_u32(),
|
|
"map.start_pos = {:?}; total_extra_bytes = {}; bpos = {:?}",
|
|
map.start_pos,
|
|
total_extra_bytes,
|
|
bpos,
|
|
);
|
|
CharPos(bpos.to_usize() - map.start_pos.to_usize() - total_extra_bytes as usize)
|
|
}
|
|
|
|
/// Converts an absolute BytePos to a CharPos relative to the source_file.
|
|
fn calc_extra_bytes(&self, map: &SourceFile, start: &mut usize, bpos: BytePos) -> u32 {
|
|
// The number of extra bytes due to multibyte chars in the SourceFile
|
|
let mut total_extra_bytes = 0;
|
|
|
|
for (i, &mbc) in map.multibyte_chars[*start..].iter().enumerate() {
|
|
debug!("{}-byte char at {:?}", mbc.bytes, mbc.pos);
|
|
if mbc.pos < bpos {
|
|
// every character is at least one byte, so we only
|
|
// count the actual extra bytes.
|
|
total_extra_bytes += mbc.bytes as u32 - 1;
|
|
// We should never see a byte position in the middle of a
|
|
// character
|
|
debug_assert!(bpos.to_u32() >= mbc.pos.to_u32() + mbc.bytes as u32);
|
|
} else {
|
|
*start += i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
total_extra_bytes
|
|
}
|
|
|
|
/// Return the index of the source_file (in self.files) which contains pos.
|
|
///
|
|
/// This method exists only for optimization and it's not part of public
|
|
/// api.
|
|
#[doc(hidden)]
|
|
pub fn lookup_source_file_in(
|
|
files: &[Arc<SourceFile>],
|
|
pos: BytePos,
|
|
) -> Option<Arc<SourceFile>> {
|
|
let count = files.len();
|
|
|
|
// Binary search for the source_file.
|
|
let mut a = 0;
|
|
let mut b = count;
|
|
while b - a > 1 {
|
|
let m = (a + b) / 2;
|
|
if files[m].start_pos > pos {
|
|
b = m;
|
|
} else {
|
|
a = m;
|
|
}
|
|
}
|
|
|
|
if a >= count {
|
|
return None;
|
|
}
|
|
|
|
Some(files[a].clone())
|
|
}
|
|
|
|
/// Return the index of the source_file (in self.files) which contains pos.
|
|
///
|
|
/// This is not a public api.
|
|
#[doc(hidden)]
|
|
pub fn lookup_source_file(&self, pos: BytePos) -> Arc<SourceFile> {
|
|
let files = self.files.borrow();
|
|
let files = &files.source_files;
|
|
let fm = Self::lookup_source_file_in(&files, pos);
|
|
match fm {
|
|
Some(fm) => fm,
|
|
None => {
|
|
panic!(
|
|
"position {} does not resolve to a source location",
|
|
pos.to_usize()
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn count_lines(&self) -> usize {
|
|
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);
|
|
self.span_to_snippet(prev_span)
|
|
.map(|snippet| {
|
|
let len = snippet
|
|
.find(|c: char| !c.is_alphanumeric() && c != '_')
|
|
.expect("no label after fn");
|
|
prev_span.with_hi(BytePos(prev_span.lo().0 + len as u32))
|
|
})
|
|
.ok()
|
|
}
|
|
|
|
/// Take 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 source_map
|
|
/// 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
|
|
let sugg_span = self.span_extend_to_prev_str(span, "fn", false);
|
|
if sugg_span != span {
|
|
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 build_source_map(&self, mappings: &mut Vec<(BytePos, LineCol)>) -> sourcemap::SourceMap {
|
|
self.build_source_map_from(mappings, None)
|
|
}
|
|
|
|
/// Creates a `.map` file.
|
|
pub fn build_source_map_from(
|
|
&self,
|
|
mappings: &mut Vec<(BytePos, LineCol)>,
|
|
orig: Option<&sourcemap::SourceMap>,
|
|
) -> sourcemap::SourceMap {
|
|
let mut builder = SourceMapBuilder::new(None);
|
|
|
|
// // This method is optimized based on the fact that mapping is sorted.
|
|
// mappings.sort_by_key(|v| v.0);
|
|
|
|
let mut cur_file: Option<Arc<SourceFile>> = None;
|
|
let mut src_id = 0;
|
|
|
|
let mut ch_start = 0;
|
|
let mut line_ch_start = 0;
|
|
|
|
for (pos, lc) in mappings.iter() {
|
|
let pos = *pos;
|
|
let lc = *lc;
|
|
|
|
// TODO: Use correct algorithm
|
|
if pos >= BytePos(4294967295) {
|
|
continue;
|
|
}
|
|
|
|
let f;
|
|
let f = match cur_file {
|
|
Some(ref f) if f.start_pos <= pos && pos < f.end_pos => f,
|
|
_ => {
|
|
f = self.lookup_source_file(pos);
|
|
src_id = builder.add_source(&f.name.to_string());
|
|
builder.set_source_contents(src_id, Some(&f.src));
|
|
cur_file = Some(f.clone());
|
|
ch_start = 0;
|
|
line_ch_start = 0;
|
|
&f
|
|
}
|
|
};
|
|
|
|
let a = match f.lookup_line(pos) {
|
|
Some(line) => line as u32,
|
|
None => continue,
|
|
};
|
|
|
|
let mut line = a + 1; // Line numbers start at 1
|
|
let linebpos = f.lines[a as usize];
|
|
debug_assert!(
|
|
pos >= linebpos,
|
|
"{}: bpos = {:?}; linebpos = {:?};",
|
|
f.name,
|
|
pos,
|
|
linebpos,
|
|
);
|
|
let chpos = { self.calc_extra_bytes(&f, &mut ch_start, pos) };
|
|
let linechpos = { self.calc_extra_bytes(&f, &mut line_ch_start, linebpos) };
|
|
|
|
let mut col = max(chpos, linechpos) - min(chpos, linechpos);
|
|
|
|
if let Some(orig) = &orig {
|
|
if let Some(token) = orig.lookup_token(line, col) {
|
|
line = token.get_src_line() + 1;
|
|
col = token.get_src_col();
|
|
}
|
|
}
|
|
|
|
builder.add_raw(lc.line, lc.col, line - 1, col, Some(src_id), None);
|
|
}
|
|
|
|
builder.into_sourcemap()
|
|
}
|
|
}
|
|
|
|
impl SourceMapper for SourceMap {
|
|
fn lookup_char_pos(&self, pos: BytePos) -> Loc {
|
|
self.lookup_char_pos(pos)
|
|
}
|
|
fn span_to_lines(&self, sp: Span) -> FileLinesResult {
|
|
self.span_to_lines(sp)
|
|
}
|
|
fn span_to_string(&self, sp: Span) -> String {
|
|
self.span_to_string(sp)
|
|
}
|
|
fn span_to_filename(&self, sp: Span) -> FileName {
|
|
self.span_to_filename(sp)
|
|
}
|
|
fn merge_spans(&self, sp_lhs: Span, sp_rhs: Span) -> Option<Span> {
|
|
self.merge_spans(sp_lhs, sp_rhs)
|
|
}
|
|
fn call_span_if_macro(&self, sp: Span) -> Span {
|
|
sp
|
|
}
|
|
fn doctest_offset_line(&self, line: usize) -> usize {
|
|
self.doctest_offset_line(line)
|
|
}
|
|
}
|
|
|
|
#[derive(Clone)]
|
|
pub struct FilePathMapping {
|
|
mapping: Vec<(PathBuf, PathBuf)>,
|
|
}
|
|
|
|
impl FilePathMapping {
|
|
pub fn empty() -> FilePathMapping {
|
|
FilePathMapping { mapping: vec![] }
|
|
}
|
|
|
|
pub fn new(mapping: Vec<(PathBuf, PathBuf)>) -> FilePathMapping {
|
|
FilePathMapping { mapping }
|
|
}
|
|
|
|
/// Applies any path prefix substitution as defined by the mapping.
|
|
/// The return value is the remapped path and a boolean indicating whether
|
|
/// the path was affected by the mapping.
|
|
pub fn map_prefix(&self, path: PathBuf) -> (PathBuf, bool) {
|
|
// NOTE: We are iterating over the mapping entries from last to first
|
|
// because entries specified later on the command line should
|
|
// take precedence.
|
|
for &(ref from, ref to) in self.mapping.iter().rev() {
|
|
if let Ok(rest) = path.strip_prefix(from) {
|
|
return (to.join(rest), true);
|
|
}
|
|
}
|
|
|
|
(path, false)
|
|
}
|
|
}
|
|
|
|
// _____________________________________________________________________________
|
|
// Tests
|
|
//
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
use std::sync::Arc;
|
|
|
|
fn init_source_map() -> SourceMap {
|
|
let sm = SourceMap::new(FilePathMapping::empty());
|
|
sm.new_source_file(
|
|
PathBuf::from("blork.rs").into(),
|
|
"first line.\nsecond line".to_string(),
|
|
);
|
|
sm.new_source_file(PathBuf::from("empty.rs").into(), String::new());
|
|
sm.new_source_file(
|
|
PathBuf::from("blork2.rs").into(),
|
|
"first line.\nsecond line".to_string(),
|
|
);
|
|
sm
|
|
}
|
|
|
|
#[test]
|
|
fn t3() {
|
|
// Test lookup_byte_offset
|
|
let sm = init_source_map();
|
|
|
|
let srcfbp1 = sm.lookup_byte_offset(BytePos(23));
|
|
assert_eq!(srcfbp1.sf.name, PathBuf::from("blork.rs").into());
|
|
assert_eq!(srcfbp1.pos, BytePos(23));
|
|
|
|
let srcfbp1 = sm.lookup_byte_offset(BytePos(24));
|
|
assert_eq!(srcfbp1.sf.name, PathBuf::from("empty.rs").into());
|
|
assert_eq!(srcfbp1.pos, BytePos(0));
|
|
|
|
let srcfbp2 = sm.lookup_byte_offset(BytePos(25));
|
|
assert_eq!(srcfbp2.sf.name, PathBuf::from("blork2.rs").into());
|
|
assert_eq!(srcfbp2.pos, BytePos(0));
|
|
}
|
|
|
|
#[test]
|
|
fn t4() {
|
|
// Test bytepos_to_file_charpos
|
|
let sm = init_source_map();
|
|
|
|
let cp1 = sm.bytepos_to_file_charpos(BytePos(22));
|
|
assert_eq!(cp1, CharPos(22));
|
|
|
|
let cp2 = sm.bytepos_to_file_charpos(BytePos(25));
|
|
assert_eq!(cp2, CharPos(0));
|
|
}
|
|
|
|
#[test]
|
|
fn t5() {
|
|
// Test zero-length source_files.
|
|
let sm = init_source_map();
|
|
|
|
let loc1 = sm.lookup_char_pos(BytePos(22));
|
|
assert_eq!(loc1.file.name, PathBuf::from("blork.rs").into());
|
|
assert_eq!(loc1.line, 2);
|
|
assert_eq!(loc1.col, CharPos(10));
|
|
|
|
let loc2 = sm.lookup_char_pos(BytePos(25));
|
|
assert_eq!(loc2.file.name, PathBuf::from("blork2.rs").into());
|
|
assert_eq!(loc2.line, 1);
|
|
assert_eq!(loc2.col, CharPos(0));
|
|
}
|
|
|
|
fn init_source_map_mbc() -> SourceMap {
|
|
let sm = SourceMap::new(FilePathMapping::empty());
|
|
// € is a three byte utf8 char.
|
|
sm.new_source_file(
|
|
PathBuf::from("blork.rs").into(),
|
|
"fir€st €€€€ line.\nsecond line".to_string(),
|
|
);
|
|
sm.new_source_file(
|
|
PathBuf::from("blork2.rs").into(),
|
|
"first line€€.\n€ second line".to_string(),
|
|
);
|
|
sm
|
|
}
|
|
|
|
#[test]
|
|
fn t6() {
|
|
// Test bytepos_to_file_charpos in the presence of multi-byte chars
|
|
let sm = init_source_map_mbc();
|
|
|
|
let cp1 = sm.bytepos_to_file_charpos(BytePos(3));
|
|
assert_eq!(cp1, CharPos(3));
|
|
|
|
let cp2 = sm.bytepos_to_file_charpos(BytePos(6));
|
|
assert_eq!(cp2, CharPos(4));
|
|
|
|
let cp3 = sm.bytepos_to_file_charpos(BytePos(56));
|
|
assert_eq!(cp3, CharPos(12));
|
|
|
|
let cp4 = sm.bytepos_to_file_charpos(BytePos(61));
|
|
assert_eq!(cp4, CharPos(15));
|
|
}
|
|
|
|
#[test]
|
|
fn t7() {
|
|
// Test span_to_lines for a span ending at the end of source_file
|
|
let sm = init_source_map();
|
|
let span = Span::new(BytePos(12), BytePos(23), NO_EXPANSION);
|
|
let file_lines = sm.span_to_lines(span).unwrap();
|
|
|
|
assert_eq!(file_lines.file.name, PathBuf::from("blork.rs").into());
|
|
assert_eq!(file_lines.lines.len(), 1);
|
|
assert_eq!(file_lines.lines[0].line_index, 1);
|
|
}
|
|
|
|
/// Given a string like " ~~~~~~~~~~~~ ", produces a span
|
|
/// converting that range. The idea is that the string has the same
|
|
/// length as the input, and we uncover the byte positions. Note
|
|
/// that this can span lines and so on.
|
|
fn span_from_selection(input: &str, selection: &str) -> Span {
|
|
assert_eq!(input.len(), selection.len());
|
|
let left_index = selection.find('~').unwrap() as u32;
|
|
let right_index = selection.rfind('~').map(|x| x as u32).unwrap_or(left_index);
|
|
Span::new(BytePos(left_index), BytePos(right_index + 1), NO_EXPANSION)
|
|
}
|
|
|
|
/// Test span_to_snippet and span_to_lines for a span converting 3
|
|
/// lines in the middle of a file.
|
|
#[test]
|
|
fn span_to_snippet_and_lines_spanning_multiple_lines() {
|
|
let sm = SourceMap::new(FilePathMapping::empty());
|
|
let inputtext = "aaaaa\nbbbbBB\nCCC\nDDDDDddddd\neee\n";
|
|
let selection = " \n ~~\n~~~\n~~~~~ \n \n";
|
|
sm.new_source_file(
|
|
Path::new("blork.rs").to_owned().into(),
|
|
inputtext.to_string(),
|
|
);
|
|
let span = span_from_selection(inputtext, selection);
|
|
|
|
// check that we are extracting the text we thought we were extracting
|
|
assert_eq!(&sm.span_to_snippet(span).unwrap(), "BB\nCCC\nDDDDD");
|
|
|
|
// check that span_to_lines gives us the complete result with the lines/cols we
|
|
// expected
|
|
let lines = sm.span_to_lines(span).unwrap();
|
|
let expected = vec![
|
|
LineInfo {
|
|
line_index: 1,
|
|
start_col: CharPos(4),
|
|
end_col: CharPos(6),
|
|
},
|
|
LineInfo {
|
|
line_index: 2,
|
|
start_col: CharPos(0),
|
|
end_col: CharPos(3),
|
|
},
|
|
LineInfo {
|
|
line_index: 3,
|
|
start_col: CharPos(0),
|
|
end_col: CharPos(5),
|
|
},
|
|
];
|
|
assert_eq!(lines.lines, expected);
|
|
}
|
|
|
|
#[test]
|
|
fn t8() {
|
|
// Test span_to_snippet for a span ending at the end of source_file
|
|
let sm = init_source_map();
|
|
let span = Span::new(BytePos(12), BytePos(23), NO_EXPANSION);
|
|
let snippet = sm.span_to_snippet(span);
|
|
|
|
assert_eq!(snippet, Ok("second line".to_string()));
|
|
}
|
|
|
|
#[test]
|
|
fn t9() {
|
|
// Test span_to_str for a span ending at the end of source_file
|
|
let sm = init_source_map();
|
|
let span = Span::new(BytePos(12), BytePos(23), NO_EXPANSION);
|
|
let sstr = sm.span_to_string(span);
|
|
|
|
assert_eq!(sstr, "blork.rs:2:1: 2:12");
|
|
}
|
|
|
|
/// Test failing to merge two spans on different lines
|
|
#[test]
|
|
fn span_merging_fail() {
|
|
let sm = SourceMap::new(FilePathMapping::empty());
|
|
let inputtext = "bbbb BB\ncc CCC\n";
|
|
let selection1 = " ~~\n \n";
|
|
let selection2 = " \n ~~~\n";
|
|
sm.new_source_file(
|
|
Path::new("blork.rs").to_owned().into(),
|
|
inputtext.to_owned(),
|
|
);
|
|
let span1 = span_from_selection(inputtext, selection1);
|
|
let span2 = span_from_selection(inputtext, selection2);
|
|
|
|
assert!(sm.merge_spans(span1, span2).is_none());
|
|
}
|
|
|
|
/// Returns the span corresponding to the `n`th occurrence of
|
|
/// `substring` in `source_text`.
|
|
trait SourceMapExtension {
|
|
fn span_substr(
|
|
&self,
|
|
file: &Arc<SourceFile>,
|
|
source_text: &str,
|
|
substring: &str,
|
|
n: usize,
|
|
) -> Span;
|
|
}
|
|
|
|
impl SourceMapExtension for SourceMap {
|
|
fn span_substr(
|
|
&self,
|
|
file: &Arc<SourceFile>,
|
|
source_text: &str,
|
|
substring: &str,
|
|
n: usize,
|
|
) -> Span {
|
|
let mut i = 0;
|
|
let mut hi = 0;
|
|
loop {
|
|
let offset = source_text[hi..].find(substring).unwrap_or_else(|| {
|
|
panic!(
|
|
"source_text `{}` does not have {} occurrences of `{}`, only {}",
|
|
source_text, n, substring, i
|
|
);
|
|
});
|
|
let lo = hi + offset;
|
|
hi = lo + substring.len();
|
|
if i == n {
|
|
let span = Span::new(
|
|
BytePos(lo as u32 + file.start_pos.0),
|
|
BytePos(hi as u32 + file.start_pos.0),
|
|
NO_EXPANSION,
|
|
);
|
|
assert_eq!(&self.span_to_snippet(span).unwrap()[..], substring);
|
|
return span;
|
|
}
|
|
i += 1;
|
|
}
|
|
}
|
|
}
|
|
}
|