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// 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::rc::Rc;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>;}
impl<T> SourceMapGetter for Rc<T>where  T: SourceMapGetter,{  fn get_source_map(&self, file_name: &str) -> Option<Vec<u8>> {    (**self).get_source_map(file_name)  }
  fn get_source_line(    &self,    file_name: &str,    line_number: usize,  ) -> Option<String> {    (**self).get_source_line(file_name, line_number)  }}
#[derive(Debug, Default)]pub struct SourceMapCache {  maps: HashMap<String, Option<SourceMap>>,  source_lines: HashMap<(String, i64), Option<String>>,}
pub fn apply_source_map<G: SourceMapGetter + ?Sized>(  file_name: String,  line_number: i64,  column_number: i64,  cache: &mut SourceMapCache,  getter: &G,) -> (String, i64, i64) {  // 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);  let maybe_source_map =    cache.maps.entry(file_name.clone()).or_insert_with(|| {      getter        .get_source_map(&file_name)        .and_then(|raw_source_map| SourceMap::from_slice(&raw_source_map).ok())    });  let (file_name, line_number, column_number) = 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,            };            (              file_name,              i64::from(token.get_src_line()),              i64::from(token.get_src_col()),            )          }        },      }    }  };  (file_name, line_number + 1, column_number + 1)}
const MAX_SOURCE_LINE_LENGTH: usize = 150;
pub fn get_source_line<G: SourceMapGetter + ?Sized>(  file_name: &str,  line_number: i64,  cache: &mut SourceMapCache,  getter: &G,) -> Option<String> {  cache    .source_lines    .entry((file_name.to_string(), line_number))    .or_insert_with(|| {      // Source lookup expects a 0-based line number, ours are 1-based.      let s = getter.get_source_line(file_name, (line_number - 1) as usize);      s.filter(|s| s.len() <= MAX_SOURCE_LINE_LENGTH)    })    .clone()}