forked from denoland/deno
-
Notifications
You must be signed in to change notification settings - Fork 0
/
mod.rs
254 lines (226 loc) · 7.16 KB
/
mod.rs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
mod errors;
mod esm_resolver;
use crate::file_fetcher::FileFetcher;
use deno_ast::MediaType;
use deno_core::error::AnyError;
use deno_core::located_script_name;
use deno_core::url::Url;
use deno_core::JsRuntime;
use deno_core::ModuleSpecifier;
use once_cell::sync::Lazy;
use std::sync::Arc;
pub use esm_resolver::check_if_should_use_esm_loader;
pub use esm_resolver::NodeEsmResolver;
// TODO(bartlomieju): this needs to be bumped manually for
// each release, a better mechanism is preferable, but it's a quick and dirty
// solution to avoid printing `X-Deno-Warning` headers when the compat layer is
// downloaded
static STD_URL_STR: &str = "https://deno.land/[email protected]/";
static SUPPORTED_MODULES: &[&str] = &[
"assert",
"assert/strict",
"async_hooks",
"buffer",
"child_process",
"cluster",
"console",
"constants",
"crypto",
"dgram",
"dns",
"domain",
"events",
"fs",
"fs/promises",
"http",
"https",
"module",
"net",
"os",
"path",
"path/posix",
"path/win32",
"perf_hooks",
"process",
"querystring",
"readline",
"stream",
"stream/promises",
"stream/web",
"string_decoder",
"sys",
"timers",
"timers/promises",
"tls",
"tty",
"url",
"util",
"util/types",
"v8",
"vm",
"zlib",
];
static NODE_COMPAT_URL: Lazy<String> = Lazy::new(|| {
std::env::var("DENO_NODE_COMPAT_URL")
.map(String::into)
.ok()
.unwrap_or_else(|| STD_URL_STR.to_string())
});
static GLOBAL_URL_STR: Lazy<String> =
Lazy::new(|| format!("{}node/global.ts", NODE_COMPAT_URL.as_str()));
pub static GLOBAL_URL: Lazy<Url> =
Lazy::new(|| Url::parse(&GLOBAL_URL_STR).unwrap());
static MODULE_URL_STR: Lazy<String> =
Lazy::new(|| format!("{}node/module.ts", NODE_COMPAT_URL.as_str()));
pub static MODULE_URL: Lazy<Url> =
Lazy::new(|| Url::parse(&MODULE_URL_STR).unwrap());
static COMPAT_IMPORT_URL: Lazy<Url> =
Lazy::new(|| Url::parse("flags:compat").unwrap());
/// Provide imports into a module graph when the compat flag is true.
pub fn get_node_imports() -> Vec<(Url, Vec<String>)> {
vec![(COMPAT_IMPORT_URL.clone(), vec![GLOBAL_URL_STR.clone()])]
}
fn try_resolve_builtin_module(specifier: &str) -> Option<Url> {
if SUPPORTED_MODULES.contains(&specifier) {
let module_url =
format!("{}node/{}.ts", NODE_COMPAT_URL.as_str(), specifier);
Some(Url::parse(&module_url).unwrap())
} else {
None
}
}
pub fn load_cjs_module(
js_runtime: &mut JsRuntime,
module: &str,
main: bool,
) -> Result<(), AnyError> {
let source_code = &format!(
r#"(async function loadCjsModule(module) {{
const Module = await import("{module_loader}");
Module.default._load(module, null, {main});
}})('{module}');"#,
module_loader = MODULE_URL_STR.as_str(),
main = main,
module = escape_for_single_quote_string(module),
);
js_runtime.execute_script(&located_script_name!(), source_code)?;
Ok(())
}
pub fn add_global_require(
js_runtime: &mut JsRuntime,
main_module: &str,
) -> Result<(), AnyError> {
let source_code = &format!(
r#"(async function setupGlobalRequire(main) {{
const Module = await import("{}");
const require = Module.createRequire(main);
globalThis.require = require;
}})('{}');"#,
MODULE_URL_STR.as_str(),
escape_for_single_quote_string(main_module),
);
js_runtime.execute_script(&located_script_name!(), source_code)?;
Ok(())
}
fn escape_for_single_quote_string(text: &str) -> String {
text.replace('\\', r"\\").replace('\'', r"\'")
}
pub fn setup_builtin_modules(
js_runtime: &mut JsRuntime,
) -> Result<(), AnyError> {
let mut script = String::new();
for module in SUPPORTED_MODULES {
// skipping the modules that contains '/' as they are not available in NodeJS repl as well
if !module.contains('/') {
script = format!("{}const {} = require('{}');\n", script, module, module);
}
}
js_runtime.execute_script("setup_node_builtins.js", &script)?;
Ok(())
}
/// Translates given CJS module into ESM. This function will perform static
/// analysis on the file to find defined exports and reexports.
///
/// For all discovered reexports the analysis will be performed recursively.
///
/// If successful a source code for equivalent ES module is returned.
pub async fn translate_cjs_to_esm(
file_fetcher: &FileFetcher,
specifier: &ModuleSpecifier,
code: String,
media_type: MediaType,
) -> Result<String, AnyError> {
let parsed_source = deno_ast::parse_script(deno_ast::ParseParams {
specifier: specifier.to_string(),
source: deno_ast::SourceTextInfo::new(Arc::new(code)),
media_type,
capture_tokens: true,
scope_analysis: false,
maybe_syntax: None,
})?;
let analysis = parsed_source.analyze_cjs();
let mut source = vec![
r#"import { createRequire } from "node:module";"#.to_string(),
r#"const require = createRequire(import.meta.url);"#.to_string(),
];
// if there are reexports, handle them first
for (idx, reexport) in analysis.reexports.iter().enumerate() {
// Firstly, resolve relate reexport specifier
let resolved_reexport = node_resolver::resolve(
reexport,
&specifier.to_file_path().unwrap(),
// FIXME(bartlomieju): check if these conditions are okay, probably
// should be `deno-require`, because `deno` is already used in `esm_resolver.rs`
&["deno", "require", "default"],
)?;
let reexport_specifier =
ModuleSpecifier::from_file_path(&resolved_reexport).unwrap();
// Secondly, read the source code from disk
let reexport_file = file_fetcher.get_source(&reexport_specifier).unwrap();
// Now perform analysis again
{
let parsed_source = deno_ast::parse_script(deno_ast::ParseParams {
specifier: reexport_specifier.to_string(),
source: deno_ast::SourceTextInfo::new(reexport_file.source),
media_type: reexport_file.media_type,
capture_tokens: true,
scope_analysis: false,
maybe_syntax: None,
})?;
let analysis = parsed_source.analyze_cjs();
source.push(format!(
"const reexport{} = require(\"{}\");",
idx, reexport
));
for export in analysis.exports.iter().filter(|e| e.as_str() != "default")
{
// TODO(bartlomieju): Node actually checks if a given export exists in `exports` object,
// but it might not be necessary here since our analysis is more detailed?
source.push(format!(
"export const {} = reexport{}.{};",
export, idx, export
));
}
}
}
source.push(format!(
"const mod = require(\"{}\");",
specifier
.to_file_path()
.unwrap()
.to_str()
.unwrap()
.replace('\\', "\\\\")
.replace('\'', "\\\'")
.replace('\"', "\\\"")
));
source.push("export default mod".to_string());
for export in analysis.exports.iter().filter(|e| e.as_str() != "default") {
// TODO(bartlomieju): Node actually checks if a given export exists in `exports` object,
// but it might not be necessary here since our analysis is more detailed?
source.push(format!("export const {} = mod.{};", export, export));
}
let translated_source = source.join("\n");
Ok(translated_source)
}