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/*
* Copyright (C) 2022 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <wtf/Expected.h>
#include <wtf/HashMap.h>
#include <wtf/HashSet.h>
#include <wtf/URL.h>
#include <wtf/URLHash.h>
#include <wtf/Vector.h>
#include <wtf/text/AtomStringHash.h>
namespace JSC {
class SourceCode;
class ImportMap final : public RefCounted<ImportMap> {
public:
using SpecifierMap = UncheckedKeyHashMap<AtomString, URL>;
using ScopesMap = UncheckedKeyHashMap<URL, SpecifierMap>;
using ScopesVector = Vector<URL>;
using IntegrityMap = UncheckedKeyHashMap<URL, String>;
class Reporter {
public:
virtual ~Reporter() = default;
virtual void reportWarning(const String&) const { };
virtual void reportError(const String&) const { };
};
static Ref<ImportMap> create() { return adoptRef(*new ImportMap()); }
JS_EXPORT_PRIVATE URL resolve(const String& specifier, const URL& baseURL);
JS_EXPORT_PRIVATE String integrityForURL(const URL&) const;
// https://html.spec.whatwg.org/C#parse-an-import-map-string
JS_EXPORT_PRIVATE static std::optional<Ref<ImportMap>> parseImportMapString(const SourceCode&, const URL& baseURL, const ImportMap::Reporter&);
// https://html.spec.whatwg.org/C/#merge-existing-and-new-import-maps
// `newImportMap` is modified in place here, and should not be used after
// this call.
JS_EXPORT_PRIVATE void mergeExistingAndNewImportMaps(Ref<ImportMap>&& newImportMap, const ImportMap::Reporter&);
void addModuleToResolvedModuleSet(String referringScriptURL, AtomString specifier);
private:
ImportMap() = default;
ImportMap(SpecifierMap&&, ScopesMap&&, IntegrityMap&&);
static Expected<URL, String> resolveImportMatch(const AtomString&, const URL&, const SpecifierMap&);
SpecifierMap m_imports;
ScopesMap m_scopesMap;
ScopesVector m_scopesVector;
IntegrityMap m_integrity;
// https://html.spec.whatwg.org/C#resolved-module-set
//
// We replace the spec's set with two different data structures: a set of all
// the prefixes resolved at the top-level scope, and a map of scopes to sets
// of prefixes resolved in them. That permits us to reduce the cost of merging
// a new map, by performing more work at addModuleToResolvedModuleSet time,
// and by keeping more prefixes in memory.
UncheckedKeyHashSet<AtomString> m_toplevelResolvedModuleSet;
UncheckedKeyHashMap<AtomString, UncheckedKeyHashSet<AtomString>> m_scopedResolvedModuleMap;
};
} // namespace JSC
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