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109 lines
3.2 KiB
Rust
109 lines
3.2 KiB
Rust
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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//! This mod provides functions to remap a `JsError` based on a source map.
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use crate::resolve_url;
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pub use sourcemap::SourceMap;
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use std::collections::HashMap;
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use std::rc::Rc;
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use std::str;
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pub trait SourceMapGetter {
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/// Returns the raw source map file.
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fn get_source_map(&self, file_name: &str) -> Option<Vec<u8>>;
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fn get_source_line(
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&self,
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file_name: &str,
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line_number: usize,
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) -> Option<String>;
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}
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impl<T> SourceMapGetter for Rc<T>
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where
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T: SourceMapGetter,
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{
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fn get_source_map(&self, file_name: &str) -> Option<Vec<u8>> {
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(**self).get_source_map(file_name)
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}
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fn get_source_line(
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&self,
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file_name: &str,
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line_number: usize,
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) -> Option<String> {
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(**self).get_source_line(file_name, line_number)
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}
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}
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#[derive(Debug, Default)]
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pub struct SourceMapCache {
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maps: HashMap<String, Option<SourceMap>>,
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source_lines: HashMap<(String, i64), Option<String>>,
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}
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pub fn apply_source_map<G: SourceMapGetter + ?Sized>(
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file_name: String,
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line_number: i64,
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column_number: i64,
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cache: &mut SourceMapCache,
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getter: &G,
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) -> (String, i64, i64) {
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// Lookup expects 0-based line and column numbers, but ours are 1-based.
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let line_number = line_number - 1;
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let column_number = column_number - 1;
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let default_pos = (file_name.clone(), line_number, column_number);
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let maybe_source_map =
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cache.maps.entry(file_name.clone()).or_insert_with(|| {
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getter
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.get_source_map(&file_name)
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.and_then(|raw_source_map| SourceMap::from_slice(&raw_source_map).ok())
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});
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let (file_name, line_number, column_number) = match maybe_source_map {
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None => default_pos,
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Some(source_map) => {
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match source_map.lookup_token(line_number as u32, column_number as u32) {
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None => default_pos,
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Some(token) => match token.get_source() {
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None => default_pos,
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Some(source_file_name) => {
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// The `source_file_name` written by tsc in the source map is
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// sometimes only the basename of the URL, or has unwanted `<`/`>`
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// around it. Use the `file_name` we get from V8 if
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// `source_file_name` does not parse as a URL.
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let file_name = match resolve_url(source_file_name) {
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Ok(m) if m.scheme() == "blob" => file_name,
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Ok(m) => m.to_string(),
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Err(_) => file_name,
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};
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(
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file_name,
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i64::from(token.get_src_line()),
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i64::from(token.get_src_col()),
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)
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}
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},
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}
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}
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};
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(file_name, line_number + 1, column_number + 1)
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}
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const MAX_SOURCE_LINE_LENGTH: usize = 150;
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pub fn get_source_line<G: SourceMapGetter + ?Sized>(
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file_name: &str,
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line_number: i64,
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cache: &mut SourceMapCache,
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getter: &G,
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) -> Option<String> {
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cache
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.source_lines
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.entry((file_name.to_string(), line_number))
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.or_insert_with(|| {
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// Source lookup expects a 0-based line number, ours are 1-based.
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let s = getter.get_source_line(file_name, (line_number - 1) as usize);
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s.filter(|s| s.len() <= MAX_SOURCE_LINE_LENGTH)
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})
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.clone()
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}
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