mirror of
https://github.com/denoland/deno.git
synced 2024-12-27 01:29:14 -05:00
99 lines
3.3 KiB
Rust
99 lines
3.3 KiB
Rust
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
|
|
|
|
//! This mod provides functions to remap a `JsError` based on a source map.
|
|
|
|
use crate::resolve_url;
|
|
pub use sourcemap::SourceMap;
|
|
use std::collections::HashMap;
|
|
use std::str;
|
|
|
|
pub trait SourceMapGetter {
|
|
/// Returns the raw source map file.
|
|
fn get_source_map(&self, file_name: &str) -> Option<Vec<u8>>;
|
|
fn get_source_line(
|
|
&self,
|
|
file_name: &str,
|
|
line_number: usize,
|
|
) -> Option<String>;
|
|
}
|
|
|
|
/// Cached filename lookups. The key can be None if a previous lookup failed to
|
|
/// find a SourceMap.
|
|
pub type CachedMaps = HashMap<String, Option<SourceMap>>;
|
|
|
|
pub fn apply_source_map<G: SourceMapGetter + ?Sized>(
|
|
file_name: String,
|
|
line_number: i64,
|
|
column_number: i64,
|
|
mappings_map: &mut CachedMaps,
|
|
getter: &G,
|
|
) -> (String, i64, i64, Option<String>) {
|
|
// Lookup expects 0-based line and column numbers, but ours are 1-based.
|
|
let line_number = line_number - 1;
|
|
let column_number = column_number - 1;
|
|
|
|
let default_pos = (file_name.clone(), line_number, column_number, None);
|
|
let maybe_source_map = get_mappings(&file_name, mappings_map, getter);
|
|
let (file_name, line_number, column_number, source_line) =
|
|
match maybe_source_map {
|
|
None => default_pos,
|
|
Some(source_map) => {
|
|
match source_map.lookup_token(line_number as u32, column_number as u32)
|
|
{
|
|
None => default_pos,
|
|
Some(token) => match token.get_source() {
|
|
None => default_pos,
|
|
Some(source_file_name) => {
|
|
// The `source_file_name` written by tsc in the source map is
|
|
// sometimes only the basename of the URL, or has unwanted `<`/`>`
|
|
// around it. Use the `file_name` we get from V8 if
|
|
// `source_file_name` does not parse as a URL.
|
|
let file_name = match resolve_url(source_file_name) {
|
|
Ok(m) if m.scheme() == "blob" => file_name,
|
|
Ok(m) => m.to_string(),
|
|
Err(_) => file_name,
|
|
};
|
|
let source_line =
|
|
if let Some(source_view) = token.get_source_view() {
|
|
source_view
|
|
.get_line(token.get_src_line())
|
|
.map(|s| s.to_string())
|
|
} else {
|
|
None
|
|
};
|
|
(
|
|
file_name,
|
|
i64::from(token.get_src_line()),
|
|
i64::from(token.get_src_col()),
|
|
source_line,
|
|
)
|
|
}
|
|
},
|
|
}
|
|
}
|
|
};
|
|
let source_line = source_line
|
|
.or_else(|| getter.get_source_line(&file_name, line_number as usize));
|
|
(file_name, line_number + 1, column_number + 1, source_line)
|
|
}
|
|
|
|
fn get_mappings<'a, G: SourceMapGetter + ?Sized>(
|
|
file_name: &str,
|
|
mappings_map: &'a mut CachedMaps,
|
|
getter: &G,
|
|
) -> &'a Option<SourceMap> {
|
|
mappings_map
|
|
.entry(file_name.to_string())
|
|
.or_insert_with(|| parse_map_string(file_name, getter))
|
|
}
|
|
|
|
// TODO(kitsonk) parsed source maps should probably be cached in state in
|
|
// the module meta data.
|
|
fn parse_map_string<G: SourceMapGetter + ?Sized>(
|
|
file_name: &str,
|
|
getter: &G,
|
|
) -> Option<SourceMap> {
|
|
getter
|
|
.get_source_map(file_name)
|
|
.and_then(|raw_source_map| SourceMap::from_slice(&raw_source_map).ok())
|
|
}
|