| // Copyright 2017 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_LOADER_MODULESCRIPT_MODULE_TREE_LINKER_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_LOADER_MODULESCRIPT_MODULE_TREE_LINKER_H_ |
| |
| #include "third_party/blink/public/platform/web_url_request.h" |
| #include "third_party/blink/renderer/core/core_export.h" |
| #include "third_party/blink/renderer/core/script/modulator.h" |
| #include "third_party/blink/renderer/platform/bindings/script_wrappable.h" |
| #include "third_party/blink/renderer/platform/bindings/trace_wrapper_member.h" |
| #include "third_party/blink/renderer/platform/loader/fetch/fetch_client_settings_object_snapshot.h" |
| #include "third_party/blink/renderer/platform/weborigin/kurl.h" |
| #include "third_party/blink/renderer/platform/weborigin/kurl_hash.h" |
| #include "third_party/blink/renderer/platform/wtf/hash_set.h" |
| |
| namespace blink { |
| |
| class ModuleScriptFetchRequest; |
| class ModuleTreeLinkerRegistry; |
| |
| // A ModuleTreeLinker is responsible for running and keeping intermediate states |
| // for a top-level [IMSGF] "internal module script graph fetching procedure" or |
| // a top-level [FDaI] "fetch the descendants of and instantiate", and all the |
| // invocations of [IMSGF] and [FD] "fetch the descendants" under that. |
| // |
| // Modulator represents "a module map settings object" and |
| // ResourceFetcher represents "a fetch client settings object" |
| // by its |Context()->GetFetchClientSettingsObject()|. |
| // |
| // Spec links: |
| // [IMSGF] |
| // https://html.spec.whatwg.org/#internal-module-script-graph-fetching-procedure |
| // [FD] |
| // https://html.spec.whatwg.org/#fetch-the-descendants-of-a-module-script |
| // [FDaI] |
| // https://html.spec.whatwg.org/#fetch-the-descendants-of-and-instantiate-a-module-script |
| // [FFPE] |
| // https://html.spec.whatwg.org/#finding-the-first-parse-error |
| class CORE_EXPORT ModuleTreeLinker final : public SingleModuleClient { |
| public: |
| // https://html.spec.whatwg.org/#fetch-a-module-script-tree |
| static void Fetch(const KURL&, |
| ResourceFetcher* fetch_client_settings_object_fetcher, |
| mojom::RequestContextType destination, |
| const ScriptFetchOptions&, |
| Modulator*, |
| ModuleScriptCustomFetchType, |
| ModuleTreeLinkerRegistry*, |
| ModuleTreeClient*); |
| |
| // [FDaI] for an inline script. |
| static void FetchDescendantsForInlineScript( |
| ModuleScript*, |
| ResourceFetcher* fetch_client_settings_object_fetcher, |
| mojom::RequestContextType destination, |
| Modulator*, |
| ModuleScriptCustomFetchType, |
| ModuleTreeLinkerRegistry*, |
| ModuleTreeClient*); |
| |
| ModuleTreeLinker(ResourceFetcher* fetch_client_settings_object_fetcher, |
| mojom::RequestContextType destination, |
| Modulator*, |
| ModuleScriptCustomFetchType, |
| ModuleTreeLinkerRegistry*, |
| ModuleTreeClient*); |
| ~ModuleTreeLinker() override = default; |
| void Trace(blink::Visitor*) override; |
| |
| bool IsFetching() const { |
| return State::kFetchingSelf <= state_ && state_ < State::kFinished; |
| } |
| bool HasFinished() const { return state_ == State::kFinished; } |
| |
| private: |
| enum class State { |
| kInitial, |
| // Running fetch of the module script corresponding to the target node. |
| kFetchingSelf, |
| // Running fetch of descendants of the target node. |
| kFetchingDependencies, |
| // Instantiating module_script_ and the node descendants. |
| kInstantiating, |
| kFinished, |
| }; |
| #if DCHECK_IS_ON() |
| static const char* StateToString(State); |
| #endif |
| void AdvanceState(State); |
| |
| void FetchRoot(const KURL&, const ScriptFetchOptions&); |
| void FetchRootInline(ModuleScript*); |
| |
| // Steps 1--2 of [IMSGF]. |
| void InitiateInternalModuleScriptGraphFetching( |
| const ModuleScriptFetchRequest&, |
| ModuleGraphLevel); |
| |
| // Steps 3--7 of [IMSGF], and [FD]/[FDaI] called from [IMSGF]. |
| // TODO(hiroshige): Currently |
| void NotifyModuleLoadFinished(ModuleScript*) override; |
| void FetchDescendants(ModuleScript*); |
| |
| // Completion of [FD]. |
| void FinalizeFetchDescendantsForOneModuleScript(); |
| |
| // [FDaI] Steps 4--8. |
| void Instantiate(); |
| |
| // [FFPE] |
| ScriptValue FindFirstParseError(ModuleScript*, |
| HeapHashSet<Member<ModuleScript>>*) const; |
| |
| const Member<ResourceFetcher> fetch_client_settings_object_fetcher_; |
| |
| const mojom::RequestContextType destination_; |
| const Member<Modulator> modulator_; |
| const ModuleScriptCustomFetchType custom_fetch_type_; |
| HashSet<KURL> visited_set_; |
| const Member<ModuleTreeLinkerRegistry> registry_; |
| const Member<ModuleTreeClient> client_; |
| State state_ = State::kInitial; |
| |
| // Correspond to _result_ in |
| // https://html.spec.whatwg.org/multipage/webappapis.html#internal-module-script-graph-fetching-procedure |
| TraceWrapperMember<ModuleScript> result_; |
| |
| bool found_parse_error_ = false; |
| |
| size_t num_incomplete_fetches_ = 0; |
| |
| #if DCHECK_IS_ON() |
| KURL original_url_; |
| KURL url_; |
| bool root_is_inline_; |
| |
| friend CORE_EXPORT std::ostream& operator<<(std::ostream&, |
| const ModuleTreeLinker&); |
| #endif |
| }; |
| |
| #if DCHECK_IS_ON() |
| CORE_EXPORT std::ostream& operator<<(std::ostream&, const ModuleTreeLinker&); |
| #endif |
| |
| } // namespace blink |
| |
| #endif |