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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
use std::ops::Range;
use base64::prelude::BASE64_STANDARD;
use base64::Engine;
use deno_core::ModuleSourceCode;
static SOURCE_MAP_PREFIX: &[u8] =
b"//# sourceMappingURL=data:application/json;base64,";
pub fn source_map_from_code(code: &[u8]) -> Option<Vec<u8>> {
let range = find_source_map_range(code)?;
let source_map_range = &code[range];
let input = source_map_range.split_at(SOURCE_MAP_PREFIX.len()).1;
let decoded_map = BASE64_STANDARD.decode(input).ok()?;
Some(decoded_map)
}
/// Truncate the source code before the source map.
pub fn code_without_source_map(code: ModuleSourceCode) -> ModuleSourceCode {
use deno_core::ModuleCodeBytes;
match code {
ModuleSourceCode::String(mut code) => {
if let Some(range) = find_source_map_range(code.as_bytes()) {
code.truncate(range.start);
}
ModuleSourceCode::String(code)
}
ModuleSourceCode::Bytes(code) => {
if let Some(range) = find_source_map_range(code.as_bytes()) {
let source_map_index = range.start;
ModuleSourceCode::Bytes(match code {
ModuleCodeBytes::Static(bytes) => {
ModuleCodeBytes::Static(&bytes[..source_map_index])
}
ModuleCodeBytes::Boxed(bytes) => {
// todo(dsherret): should be possible without cloning
ModuleCodeBytes::Boxed(
bytes[..source_map_index].to_vec().into_boxed_slice(),
)
}
ModuleCodeBytes::Arc(bytes) => ModuleCodeBytes::Boxed(
bytes[..source_map_index].to_vec().into_boxed_slice(),
),
})
} else {
ModuleSourceCode::Bytes(code)
}
}
}
}
fn find_source_map_range(code: &[u8]) -> Option<Range<usize>> {
fn last_non_blank_line_range(code: &[u8]) -> Option<Range<usize>> {
let mut hit_non_whitespace = false;
let mut range_end = code.len();
for i in (0..code.len()).rev() {
match code[i] {
b' ' | b'\t' => {
if !hit_non_whitespace {
range_end = i;
}
}
b'\n' | b'\r' => {
if hit_non_whitespace {
return Some(i + 1..range_end);
}
range_end = i;
}
_ => {
hit_non_whitespace = true;
}
}
}
None
}
let range = last_non_blank_line_range(code)?;
if code[range.start..range.end].starts_with(SOURCE_MAP_PREFIX) {
Some(range)
} else {
None
}
}
#[cfg(test)]
mod tests {
use std::sync::Arc;
use deno_core::ModuleCodeBytes;
use deno_core::ModuleCodeString;
use super::*;
#[test]
fn test_source_map_from_code() {
let to_string =
|bytes: Vec<u8>| -> String { String::from_utf8(bytes).unwrap() };
assert_eq!(
source_map_from_code(
b"test\n//# sourceMappingURL=data:application/json;base64,dGVzdGluZ3Rlc3Rpbmc=",
).map(to_string),
Some("testingtesting".to_string())
);
assert_eq!(
source_map_from_code(
b"test\n//# sourceMappingURL=data:application/json;base64,dGVzdGluZ3Rlc3Rpbmc=\n \n",
).map(to_string),
Some("testingtesting".to_string())
);
assert_eq!(
source_map_from_code(
b"test\n//# sourceMappingURL=data:application/json;base64,dGVzdGluZ3Rlc3Rpbmc=\n test\n",
),
None
);
assert_eq!(
source_map_from_code(
b"\"use strict\";
throw new Error(\"Hello world!\");
//# sourceMappingURL=data:application/json;base64,{",
),
None
);
}
#[test]
fn test_source_without_source_map() {
run_test("", "");
run_test("\n", "\n");
run_test("\r\n", "\r\n");
run_test("a", "a");
run_test("a\n", "a\n");
run_test("a\r\n", "a\r\n");
run_test("a\r\nb", "a\r\nb");
run_test("a\nb\n", "a\nb\n");
run_test("a\r\nb\r\n", "a\r\nb\r\n");
run_test(
"test\n//# sourceMappingURL=data:application/json;base64,test",
"test\n",
);
run_test(
"test\r\n//# sourceMappingURL=data:application/json;base64,test",
"test\r\n",
);
run_test(
"\n//# sourceMappingURL=data:application/json;base64,test",
"\n",
);
run_test(
"test\n//# sourceMappingURL=data:application/json;base64,test\n\n",
"test\n",
);
run_test(
"test\n//# sourceMappingURL=data:application/json;base64,test\n \n ",
"test\n",
);
fn run_test(input: &'static str, output: &'static str) {
let forms = [
ModuleSourceCode::String(ModuleCodeString::from_static(input)),
ModuleSourceCode::String({
let text: Arc<str> = input.into();
text.into()
}),
ModuleSourceCode::String({
let text: String = input.into();
text.into()
}),
ModuleSourceCode::Bytes(ModuleCodeBytes::Static(input.as_bytes())),
ModuleSourceCode::Bytes(ModuleCodeBytes::Boxed(
input.as_bytes().to_vec().into_boxed_slice(),
)),
ModuleSourceCode::Bytes(ModuleCodeBytes::Arc(
input.as_bytes().to_vec().into(),
)),
];
for form in forms {
let result = code_without_source_map(form);
let bytes = result.as_bytes();
assert_eq!(bytes, output.as_bytes());
}
}
}
}
|
