зеркало из https://github.com/mozilla/gecko-dev.git
222 строки
7.6 KiB
C++
222 строки
7.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: set ts=8 sts=2 et sw=2 tw=80:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* JavaScript module (as in, the syntactic construct) operations. */
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#ifndef js_Modules_h
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#define js_Modules_h
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#include <stdint.h> // uint32_t
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#include "jstypes.h" // JS_PUBLIC_API
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#include "js/CompileOptions.h" // JS::ReadOnlyCompileOptions
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#include "js/RootingAPI.h" // JS::{Mutable,}Handle
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#include "js/Value.h" // JS::Value
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struct JS_PUBLIC_API JSContext;
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class JS_PUBLIC_API JSObject;
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struct JS_PUBLIC_API JSRuntime;
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class JS_PUBLIC_API JSString;
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namespace JS {
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template <typename UnitT>
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class SourceText;
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} // namespace JS
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namespace mozilla {
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union Utf8Unit;
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}
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namespace JS {
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using ModuleResolveHook = JSObject* (*)(JSContext*, Handle<Value>,
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Handle<JSObject*>);
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/**
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* Get the HostResolveImportedModule hook for the runtime.
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*/
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extern JS_PUBLIC_API ModuleResolveHook GetModuleResolveHook(JSRuntime* rt);
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/**
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* Set the HostResolveImportedModule hook for the runtime to the given function.
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*/
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extern JS_PUBLIC_API void SetModuleResolveHook(JSRuntime* rt,
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ModuleResolveHook func);
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using ModuleMetadataHook = bool (*)(JSContext*, Handle<Value>,
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Handle<JSObject*>);
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/**
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* Get the hook for populating the import.meta metadata object.
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*/
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extern JS_PUBLIC_API ModuleMetadataHook GetModuleMetadataHook(JSRuntime* rt);
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/**
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* Set the hook for populating the import.meta metadata object to the given
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* function.
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*/
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extern JS_PUBLIC_API void SetModuleMetadataHook(JSRuntime* rt,
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ModuleMetadataHook func);
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using ModuleDynamicImportHook = bool (*)(JSContext* cx,
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Handle<Value> referencingPrivate,
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Handle<JSObject*> moduleRequest,
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Handle<JSObject*> promise);
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/**
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* Get the HostImportModuleDynamically hook for the runtime.
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*/
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extern JS_PUBLIC_API ModuleDynamicImportHook
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GetModuleDynamicImportHook(JSRuntime* rt);
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/**
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* Set the HostImportModuleDynamically hook for the runtime to the given
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* function.
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*
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* If this hook is not set (or set to nullptr) then the JS engine will throw an
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* exception if dynamic module import is attempted.
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*/
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extern JS_PUBLIC_API void SetModuleDynamicImportHook(
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JSRuntime* rt, ModuleDynamicImportHook func);
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/**
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* Passed to FinishDynamicModuleImport to indicate the result of the dynamic
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* import operation.
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*/
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enum class DynamicImportStatus { Failed = 0, Ok };
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/**
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* This must be called after a dynamic import operation is complete.
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*
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* If |evaluationPromise| is rejected, the rejection reason will be used to
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* complete the user's promise.
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*/
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extern JS_PUBLIC_API bool FinishDynamicModuleImport(
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JSContext* cx, Handle<JSObject*> evaluationPromise,
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Handle<Value> referencingPrivate, Handle<JSObject*> moduleRequest,
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Handle<JSObject*> promise);
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/**
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* This must be called after a dynamic import operation is complete.
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*
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* This is used so that Top Level Await functionality can be turned off
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* entirely. It will be removed in bug#1676612.
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*
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* If |status| is Failed, any pending exception on the context will be used to
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* complete the user's promise.
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*/
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extern JS_PUBLIC_API bool FinishDynamicModuleImport_NoTLA(
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JSContext* cx, DynamicImportStatus status, Handle<Value> referencingPrivate,
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Handle<JSObject*> moduleRequest, Handle<JSObject*> promise);
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/**
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* Parse the given source buffer as a module in the scope of the current global
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* of cx and return a source text module record.
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*/
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extern JS_PUBLIC_API JSObject* CompileModule(
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JSContext* cx, const ReadOnlyCompileOptions& options,
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SourceText<char16_t>& srcBuf);
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/**
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* Parse the given source buffer as a module in the scope of the current global
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* of cx and return a source text module record. An error is reported if a
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* UTF-8 encoding error is encountered.
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*/
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extern JS_PUBLIC_API JSObject* CompileModule(
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JSContext* cx, const ReadOnlyCompileOptions& options,
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SourceText<mozilla::Utf8Unit>& srcBuf);
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/**
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* Set a private value associated with a source text module record.
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*/
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extern JS_PUBLIC_API void SetModulePrivate(JSObject* module,
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const Value& value);
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/**
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* Get the private value associated with a source text module record.
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*/
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extern JS_PUBLIC_API Value GetModulePrivate(JSObject* module);
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/*
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* Perform the ModuleInstantiate operation on the given source text module
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* record.
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*
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* This transitively resolves all module dependencies (calling the
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* HostResolveImportedModule hook) and initializes the environment record for
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* the module.
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*/
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extern JS_PUBLIC_API bool ModuleInstantiate(JSContext* cx,
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Handle<JSObject*> moduleRecord);
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/*
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* Perform the ModuleEvaluate operation on the given source text module record
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* and returns a bool. A result value is returned in result and is either
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* undefined (and ignored) or a promise (if Top Level Await is enabled).
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*
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* If this module has already been evaluated, it returns the evaluation
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* promise. Otherwise, it transitively evaluates all dependences of this module
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* and then evaluates this module.
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*
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* ModuleInstantiate must have completed prior to calling this.
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*/
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extern JS_PUBLIC_API bool ModuleEvaluate(JSContext* cx,
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Handle<JSObject*> moduleRecord,
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MutableHandleValue rval);
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/*
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* If a module evaluation fails, unwrap the resulting evaluation promise
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* and rethrow.
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*
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* This does nothing if this module succeeds in evaluation. Otherwise, it
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* takes the reason for the module throwing, unwraps it and throws it as a
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* regular error rather than as an uncaught promise.
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*
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* ModuleEvaluate must have completed prior to calling this.
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*/
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extern JS_PUBLIC_API bool ThrowOnModuleEvaluationFailure(
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JSContext* cx, Handle<JSObject*> evaluationPromise);
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/*
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* Get a list of the module specifiers used by a source text module
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* record to request importation of modules.
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*
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* The result is a JavaScript array of object values. To extract the individual
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* values use only JS::GetArrayLength and JS_GetElement with indices 0 to length
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* - 1.
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*
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* The element values are objects with the following properties:
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* - moduleSpecifier: the module specifier string
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* - lineNumber: the line number of the import in the source text
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* - columnNumber: the column number of the import in the source text
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*
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* These property values can be extracted with GetRequestedModuleSpecifier() and
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* GetRequestedModuleSourcePos()
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*/
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extern JS_PUBLIC_API JSObject* GetRequestedModules(
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JSContext* cx, Handle<JSObject*> moduleRecord);
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extern JS_PUBLIC_API JSString* GetRequestedModuleSpecifier(
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JSContext* cx, Handle<Value> requestedModuleObject);
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extern JS_PUBLIC_API void GetRequestedModuleSourcePos(
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JSContext* cx, Handle<Value> requestedModuleObject, uint32_t* lineNumber,
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uint32_t* columnNumber);
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/*
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* Get the top-level script for a module which has not yet been executed.
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*/
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extern JS_PUBLIC_API JSScript* GetModuleScript(Handle<JSObject*> moduleRecord);
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extern JS_PUBLIC_API JSObject* CreateModuleRequest(
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JSContext* cx, Handle<JSString*> specifierArg);
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extern JS_PUBLIC_API JSString* GetModuleRequestSpecifier(
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JSContext* cx, Handle<JSObject*> moduleRequestArg);
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} // namespace JS
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#endif // js_Modules_h
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