forked from mirrors/gecko-dev
31ceef48aa
This avoid intermediate object tree for "JSON to principal" case. Differential Revision: https://phabricator.services.mozilla.com/D192146
114 lines
3.2 KiB
C++
114 lines
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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#ifndef mozilla_SharedJSONHandler_h
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#define mozilla_SharedJSONHandler_h
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#include "js/JSON.h" // JS::JSONParseHandler
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#include "mozilla/RefPtr.h" // RefPtr
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#include "BasePrincipal.h" // BasePrincipal
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namespace mozilla {
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// Base class of all principal JSON parse handlers.
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class PrincipalJSONHandlerShared : public JS::JSONParseHandler {
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public:
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// Common handlers for inner objects.
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// NOTE: propertyName and stringValue are partial overloads.
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// Subclasses should put the following:
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// * `using PrincipalJSONHandlerShared::propertyName`
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// * `using PrincipalJSONHandlerShared::stringValue`
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virtual bool propertyName(const char16_t* name, size_t length) override {
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NS_WARNING("Principal JSON shouldn't use non-ASCII");
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SetErrorState();
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return false;
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};
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virtual bool stringValue(const char16_t* str, size_t length) override {
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NS_WARNING("Principal JSON shouldn't use non-ASCII");
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SetErrorState();
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return true;
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}
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virtual bool numberValue(double d) override {
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NS_WARNING("Unexpected number value");
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SetErrorState();
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return false;
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}
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virtual bool booleanValue(bool v) override {
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NS_WARNING("Unexpected boolean value");
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SetErrorState();
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return false;
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}
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virtual bool nullValue() override {
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NS_WARNING("Unexpected null value");
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SetErrorState();
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return false;
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}
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virtual void error(const char* msg, uint32_t line, uint32_t column) override {
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// Unused.
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}
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protected:
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// Set to the error state for the above handlers.
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virtual void SetErrorState() = 0;
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public:
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RefPtr<BasePrincipal> mPrincipal;
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};
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// Base class shared between PrincipalJSONHandler and
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// SubsumedPrincipalJSONHandler.
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// This implements the common code for them, absorbing the difference about
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// whether it can contain ExpandedPrincipal or not.
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template <typename HandlerTypesT>
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class ContainerPrincipalJSONHandler : public PrincipalJSONHandlerShared {
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using State = typename HandlerTypesT::State;
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using InnerHandlerT = typename HandlerTypesT::InnerHandlerT;
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static constexpr bool CanContainExpandedPrincipal =
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HandlerTypesT::CanContainExpandedPrincipal;
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public:
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// Common handlers.
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virtual bool startObject() override;
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using PrincipalJSONHandlerShared::propertyName;
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virtual bool propertyName(const JS::Latin1Char* name, size_t length) override;
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virtual bool endObject() override;
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virtual bool startArray() override;
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virtual bool endArray() override;
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using PrincipalJSONHandlerShared::stringValue;
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virtual bool stringValue(const JS::Latin1Char* str, size_t length) override;
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private:
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bool ProcessInnerResult(bool aResult);
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template <class Func>
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bool CallOnInner(Func&& aFunc) {
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return mInnerHandler->match([&](auto& aInner) {
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bool result = aFunc(aInner);
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return ProcessInnerResult(result);
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});
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}
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protected:
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State mState = State::Init;
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InnerHandlerT mInnerHandler;
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};
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} // namespace mozilla
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#endif // mozilla_SharedJSONHandler_h
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