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module_loader.rs
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module_loader.rs
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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
use crate::emit::emit_parsed_source;
use crate::emit::TsTypeLib;
use crate::graph_util::ModuleEntry;
use crate::proc_state::ProcState;
use crate::text_encoding::code_without_source_map;
use crate::text_encoding::source_map_from_code;
use deno_ast::MediaType;
use deno_core::anyhow::anyhow;
use deno_core::error::AnyError;
use deno_core::futures::future::FutureExt;
use deno_core::futures::Future;
use deno_core::resolve_url;
use deno_core::ModuleLoader;
use deno_core::ModuleSource;
use deno_core::ModuleSpecifier;
use deno_core::ModuleType;
use deno_core::OpState;
use deno_core::SourceMapGetter;
use deno_runtime::permissions::Permissions;
use std::cell::RefCell;
use std::pin::Pin;
use std::rc::Rc;
use std::str;
struct ModuleCodeSource {
pub code: String,
pub found_url: ModuleSpecifier,
pub media_type: MediaType,
}
pub struct CliModuleLoader {
pub lib: TsTypeLib,
/// The initial set of permissions used to resolve the static imports in the
/// worker. They are decoupled from the worker (dynamic) permissions since
/// read access errors must be raised based on the parent thread permissions.
pub root_permissions: Permissions,
pub ps: ProcState,
}
impl CliModuleLoader {
pub fn new(ps: ProcState) -> Rc<Self> {
Rc::new(CliModuleLoader {
lib: ps.options.ts_type_lib_window(),
root_permissions: Permissions::allow_all(),
ps,
})
}
pub fn new_for_worker(ps: ProcState, permissions: Permissions) -> Rc<Self> {
Rc::new(CliModuleLoader {
lib: ps.options.ts_type_lib_worker(),
root_permissions: permissions,
ps,
})
}
fn load_prepared_module(
&self,
specifier: &ModuleSpecifier,
) -> Result<ModuleCodeSource, AnyError> {
let graph_data = self.ps.graph_data.read();
let found_url = graph_data.follow_redirect(specifier);
match graph_data.get(&found_url) {
Some(ModuleEntry::Module {
code,
media_type,
maybe_parsed_source,
..
}) => {
let code = match media_type {
MediaType::JavaScript
| MediaType::Unknown
| MediaType::Cjs
| MediaType::Mjs
| MediaType::Json => {
if let Some(source) = graph_data.get_cjs_esm_translation(specifier)
{
source.to_owned()
} else {
code.to_string()
}
}
MediaType::Dts | MediaType::Dcts | MediaType::Dmts => "".to_string(),
MediaType::TypeScript
| MediaType::Mts
| MediaType::Cts
| MediaType::Jsx
| MediaType::Tsx => {
// get emit text
let parsed_source = maybe_parsed_source.as_ref().unwrap(); // should always be set
emit_parsed_source(
&self.ps.emit_cache,
&found_url,
parsed_source,
&self.ps.emit_options,
self.ps.emit_options_hash,
)?
}
MediaType::TsBuildInfo | MediaType::Wasm | MediaType::SourceMap => {
panic!("Unexpected media type {} for {}", media_type, found_url)
}
};
Ok(ModuleCodeSource {
code,
found_url,
media_type: *media_type,
})
}
_ => Err(anyhow!(
"Loading unprepared module: {}",
specifier.to_string()
)),
}
}
}
impl ModuleLoader for CliModuleLoader {
fn resolve(
&self,
specifier: &str,
referrer: &str,
_is_main: bool,
) -> Result<ModuleSpecifier, AnyError> {
self.ps.resolve(specifier, referrer)
}
fn load(
&self,
specifier: &ModuleSpecifier,
_maybe_referrer: Option<ModuleSpecifier>,
_is_dynamic: bool,
) -> Pin<Box<deno_core::ModuleSourceFuture>> {
// NOTE: this block is async only because of `deno_core` interface
// requirements; module was already loaded when constructing module graph
// during call to `prepare_load` so we can load it synchronously.
let result = self.load_prepared_module(specifier).map(|code_source| {
let code = if self.ps.options.is_inspecting() {
// we need the code with the source map in order for
// it to work with --inspect or --inspect-brk
code_source.code
} else {
// reduce memory and throw away the source map
// because we don't need it
code_without_source_map(code_source.code)
};
ModuleSource {
code: code.into_bytes().into_boxed_slice(),
module_url_specified: specifier.to_string(),
module_url_found: code_source.found_url.to_string(),
module_type: match code_source.media_type {
MediaType::Json => ModuleType::Json,
_ => ModuleType::JavaScript,
},
}
});
Box::pin(deno_core::futures::future::ready(result))
}
fn prepare_load(
&self,
op_state: Rc<RefCell<OpState>>,
specifier: &ModuleSpecifier,
_maybe_referrer: Option<String>,
is_dynamic: bool,
) -> Pin<Box<dyn Future<Output = Result<(), AnyError>>>> {
let specifier = specifier.clone();
let ps = self.ps.clone();
let state = op_state.borrow();
let dynamic_permissions = state.borrow::<Permissions>().clone();
let root_permissions = if is_dynamic {
dynamic_permissions.clone()
} else {
self.root_permissions.clone()
};
let lib = self.lib;
drop(state);
async move {
ps.prepare_module_load(
vec![specifier],
is_dynamic,
lib,
root_permissions,
dynamic_permissions,
false,
)
.await
}
.boxed_local()
}
}
impl SourceMapGetter for CliModuleLoader {
fn get_source_map(&self, file_name: &str) -> Option<Vec<u8>> {
if let Ok(specifier) = resolve_url(file_name) {
match specifier.scheme() {
// we should only be looking for emits for schemes that denote external
// modules, which the disk_cache supports
"wasm" | "file" | "http" | "https" | "data" | "blob" => (),
_ => return None,
}
if let Ok(source) = self.load_prepared_module(&specifier) {
source_map_from_code(&source.code)
} else {
None
}
} else {
None
}
}
fn get_source_line(
&self,
file_name: &str,
line_number: usize,
) -> Option<String> {
let graph_data = self.ps.graph_data.read();
let specifier = graph_data.follow_redirect(&resolve_url(file_name).ok()?);
let code = match graph_data.get(&specifier) {
Some(ModuleEntry::Module { code, .. }) => code,
_ => return None,
};
// Do NOT use .lines(): it skips the terminating empty line.
// (due to internally using_terminator() instead of .split())
let lines: Vec<&str> = code.split('\n').collect();
if line_number >= lines.len() {
Some(format!(
"{} Couldn't format source line: Line {} is out of bounds (source may have changed at runtime)",
crate::colors::yellow("Warning"), line_number + 1,
))
} else {
Some(lines[line_number].to_string())
}
}
}