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// 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.
#include "third_party/blink/renderer/core/script/script_module_resolver_impl.h"
#include "third_party/blink/renderer/bindings/core/v8/script_module.h"
#include "third_party/blink/renderer/core/script/modulator.h"
#include "third_party/blink/renderer/core/script/module_script.h"
namespace blink {
void ScriptModuleResolverImpl::RegisterModuleScript(
ModuleScript* module_script) {
DCHECK(module_script);
if (module_script->Record().IsNull())
return;
DVLOG(1) << "ScriptModuleResolverImpl::RegisterModuleScript(url="
<< module_script->BaseURL().GetString()
<< ", hash=" << ScriptModuleHash::GetHash(module_script->Record())
<< ")";
auto result =
record_to_module_script_map_.Set(module_script->Record(), module_script);
DCHECK(result.is_new_entry);
}
void ScriptModuleResolverImpl::UnregisterModuleScript(
ModuleScript* module_script) {
DCHECK(module_script);
if (module_script->Record().IsNull())
return;
DVLOG(1) << "ScriptModuleResolverImpl::UnregisterModuleScript(url="
<< module_script->BaseURL().GetString()
<< ", hash=" << ScriptModuleHash::GetHash(module_script->Record())
<< ")";
record_to_module_script_map_.erase(module_script->Record());
}
ModuleScript* ScriptModuleResolverImpl::GetHostDefined(
const ScriptModule& record) const {
const auto it = record_to_module_script_map_.find(record);
CHECK_NE(it, record_to_module_script_map_.end())
<< "Failed to find ModuleScript corresponding to the "
"record.[[HostDefined]]";
CHECK(it->value);
return it->value;
}
// https://html.spec.whatwg.org/multipage/webappapis.html#hostresolveimportedmodule(referencingscriptormodule,-specifier)
ScriptModule ScriptModuleResolverImpl::Resolve(
const String& specifier,
const ScriptModule& referrer,
ExceptionState& exception_state) {
DVLOG(1) << "ScriptModuleResolverImpl::resolve(specifier=\"" << specifier
<< ", referrer.hash=" << ScriptModuleHash::GetHash(referrer) << ")";
// Step 1. Let referencing module script be referencingModule.[[HostDefined]].
ModuleScript* referrer_module = GetHostDefined(referrer);
// Step 2. Let moduleMap be referencing module script's settings object's
// module map. Note: Blink finds out "module script's settings object"
// (Modulator) from context where HostResolveImportedModule was called.
// Step 3. Let url be the result of resolving a module specifier given
// referencing module script and specifier.
KURL url = referrer_module->ResolveModuleSpecifier(specifier);
// Step 4. Assert: url is never failure, because resolving a module specifier
// must have been previously successful with these same two arguments.
DCHECK(url.IsValid());
// Step 5. Let resolved module script be moduleMap[url]. (This entry must
// exist for us to have gotten to this point.)
ModuleScript* module_script = modulator_->GetFetchedModuleScript(url);
// Step 6. Assert: resolved module script is a module script (i.e., is not
// null or "fetching").
// Step 7. Assert: resolved module script's record is not null.
DCHECK(module_script);
CHECK(!module_script->Record().IsNull());
// Step 8. Return resolved module script's module record.
return module_script->Record();
}
void ScriptModuleResolverImpl::ContextDestroyed(ExecutionContext*) {
// crbug.com/725816 : What we should really do is to make the map key
// weak reference to v8::Module.
record_to_module_script_map_.clear();
}
void ScriptModuleResolverImpl::Trace(blink::Visitor* visitor) {
ScriptModuleResolver::Trace(visitor);
ContextLifecycleObserver::Trace(visitor);
visitor->Trace(record_to_module_script_map_);
visitor->Trace(modulator_);
}
} // namespace blink
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