719 lines
19 KiB
C++
719 lines
19 KiB
C++
//=== JSON.cpp - JSON value, parsing and serialization - C++ -----------*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===---------------------------------------------------------------------===//
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#include "llvm/Support/JSON.h"
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#include "llvm/Support/ConvertUTF.h"
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#include "llvm/Support/Format.h"
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#include <cctype>
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namespace llvm {
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namespace json {
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Value &Object::operator[](const ObjectKey &K) {
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return try_emplace(K, nullptr).first->getSecond();
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}
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Value &Object::operator[](ObjectKey &&K) {
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return try_emplace(std::move(K), nullptr).first->getSecond();
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}
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Value *Object::get(StringRef K) {
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auto I = find(K);
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if (I == end())
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return nullptr;
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return &I->second;
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}
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const Value *Object::get(StringRef K) const {
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auto I = find(K);
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if (I == end())
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return nullptr;
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return &I->second;
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}
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llvm::Optional<std::nullptr_t> Object::getNull(StringRef K) const {
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if (auto *V = get(K))
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return V->getAsNull();
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return llvm::None;
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}
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llvm::Optional<bool> Object::getBoolean(StringRef K) const {
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if (auto *V = get(K))
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return V->getAsBoolean();
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return llvm::None;
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}
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llvm::Optional<double> Object::getNumber(StringRef K) const {
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if (auto *V = get(K))
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return V->getAsNumber();
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return llvm::None;
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}
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llvm::Optional<int64_t> Object::getInteger(StringRef K) const {
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if (auto *V = get(K))
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return V->getAsInteger();
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return llvm::None;
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}
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llvm::Optional<llvm::StringRef> Object::getString(StringRef K) const {
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if (auto *V = get(K))
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return V->getAsString();
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return llvm::None;
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}
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const json::Object *Object::getObject(StringRef K) const {
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if (auto *V = get(K))
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return V->getAsObject();
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return nullptr;
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}
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json::Object *Object::getObject(StringRef K) {
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if (auto *V = get(K))
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return V->getAsObject();
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return nullptr;
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}
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const json::Array *Object::getArray(StringRef K) const {
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if (auto *V = get(K))
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return V->getAsArray();
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return nullptr;
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}
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json::Array *Object::getArray(StringRef K) {
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if (auto *V = get(K))
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return V->getAsArray();
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return nullptr;
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}
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bool operator==(const Object &LHS, const Object &RHS) {
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if (LHS.size() != RHS.size())
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return false;
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for (const auto &L : LHS) {
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auto R = RHS.find(L.first);
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if (R == RHS.end() || L.second != R->second)
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return false;
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}
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return true;
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}
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Array::Array(std::initializer_list<Value> Elements) {
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V.reserve(Elements.size());
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for (const Value &V : Elements) {
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emplace_back(nullptr);
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back().moveFrom(std::move(V));
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}
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}
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Value::Value(std::initializer_list<Value> Elements)
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: Value(json::Array(Elements)) {}
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void Value::copyFrom(const Value &M) {
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Type = M.Type;
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switch (Type) {
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case T_Null:
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case T_Boolean:
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case T_Double:
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case T_Integer:
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memcpy(Union.buffer, M.Union.buffer, sizeof(Union.buffer));
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break;
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case T_StringRef:
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create<StringRef>(M.as<StringRef>());
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break;
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case T_String:
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create<std::string>(M.as<std::string>());
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break;
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case T_Object:
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create<json::Object>(M.as<json::Object>());
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break;
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case T_Array:
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create<json::Array>(M.as<json::Array>());
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break;
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}
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}
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void Value::moveFrom(const Value &&M) {
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Type = M.Type;
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switch (Type) {
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case T_Null:
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case T_Boolean:
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case T_Double:
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case T_Integer:
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memcpy(Union.buffer, M.Union.buffer, sizeof(Union.buffer));
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break;
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case T_StringRef:
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create<StringRef>(M.as<StringRef>());
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break;
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case T_String:
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create<std::string>(std::move(M.as<std::string>()));
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M.Type = T_Null;
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break;
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case T_Object:
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create<json::Object>(std::move(M.as<json::Object>()));
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M.Type = T_Null;
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break;
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case T_Array:
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create<json::Array>(std::move(M.as<json::Array>()));
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M.Type = T_Null;
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break;
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}
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}
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void Value::destroy() {
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switch (Type) {
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case T_Null:
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case T_Boolean:
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case T_Double:
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case T_Integer:
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break;
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case T_StringRef:
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as<StringRef>().~StringRef();
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break;
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case T_String:
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as<std::string>().~basic_string();
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break;
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case T_Object:
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as<json::Object>().~Object();
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break;
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case T_Array:
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as<json::Array>().~Array();
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break;
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}
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}
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bool operator==(const Value &L, const Value &R) {
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if (L.kind() != R.kind())
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return false;
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switch (L.kind()) {
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case Value::Null:
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return *L.getAsNull() == *R.getAsNull();
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case Value::Boolean:
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return *L.getAsBoolean() == *R.getAsBoolean();
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case Value::Number:
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// Workaround for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=323
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// The same integer must convert to the same double, per the standard.
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// However we see 64-vs-80-bit precision comparisons with gcc-7 -O3 -m32.
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// So we avoid floating point promotion for exact comparisons.
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if (L.Type == Value::T_Integer || R.Type == Value::T_Integer)
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return L.getAsInteger() == R.getAsInteger();
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return *L.getAsNumber() == *R.getAsNumber();
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case Value::String:
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return *L.getAsString() == *R.getAsString();
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case Value::Array:
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return *L.getAsArray() == *R.getAsArray();
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case Value::Object:
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return *L.getAsObject() == *R.getAsObject();
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}
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llvm_unreachable("Unknown value kind");
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}
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namespace {
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// Simple recursive-descent JSON parser.
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class Parser {
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public:
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Parser(StringRef JSON)
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: Start(JSON.begin()), P(JSON.begin()), End(JSON.end()) {}
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bool checkUTF8() {
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size_t ErrOffset;
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if (isUTF8(StringRef(Start, End - Start), &ErrOffset))
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return true;
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P = Start + ErrOffset; // For line/column calculation.
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return parseError("Invalid UTF-8 sequence");
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}
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bool parseValue(Value &Out);
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bool assertEnd() {
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eatWhitespace();
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if (P == End)
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return true;
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return parseError("Text after end of document");
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}
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Error takeError() {
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assert(Err);
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return std::move(*Err);
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}
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private:
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void eatWhitespace() {
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while (P != End && (*P == ' ' || *P == '\r' || *P == '\n' || *P == '\t'))
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++P;
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}
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// On invalid syntax, parseX() functions return false and set Err.
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bool parseNumber(char First, Value &Out);
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bool parseString(std::string &Out);
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bool parseUnicode(std::string &Out);
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bool parseError(const char *Msg); // always returns false
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char next() { return P == End ? 0 : *P++; }
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char peek() { return P == End ? 0 : *P; }
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static bool isNumber(char C) {
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return C == '0' || C == '1' || C == '2' || C == '3' || C == '4' ||
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C == '5' || C == '6' || C == '7' || C == '8' || C == '9' ||
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C == 'e' || C == 'E' || C == '+' || C == '-' || C == '.';
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}
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Optional<Error> Err;
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const char *Start, *P, *End;
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};
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bool Parser::parseValue(Value &Out) {
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eatWhitespace();
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if (P == End)
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return parseError("Unexpected EOF");
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switch (char C = next()) {
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// Bare null/true/false are easy - first char identifies them.
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case 'n':
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Out = nullptr;
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return (next() == 'u' && next() == 'l' && next() == 'l') ||
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parseError("Invalid JSON value (null?)");
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case 't':
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Out = true;
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return (next() == 'r' && next() == 'u' && next() == 'e') ||
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parseError("Invalid JSON value (true?)");
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case 'f':
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Out = false;
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return (next() == 'a' && next() == 'l' && next() == 's' && next() == 'e') ||
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parseError("Invalid JSON value (false?)");
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case '"': {
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std::string S;
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if (parseString(S)) {
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Out = std::move(S);
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return true;
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}
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return false;
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}
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case '[': {
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Out = Array{};
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Array &A = *Out.getAsArray();
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eatWhitespace();
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if (peek() == ']') {
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++P;
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return true;
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}
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for (;;) {
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A.emplace_back(nullptr);
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if (!parseValue(A.back()))
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return false;
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eatWhitespace();
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switch (next()) {
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case ',':
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eatWhitespace();
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continue;
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case ']':
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return true;
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default:
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return parseError("Expected , or ] after array element");
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}
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}
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}
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case '{': {
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Out = Object{};
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Object &O = *Out.getAsObject();
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eatWhitespace();
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if (peek() == '}') {
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++P;
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return true;
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}
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for (;;) {
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if (next() != '"')
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return parseError("Expected object key");
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std::string K;
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if (!parseString(K))
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return false;
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eatWhitespace();
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if (next() != ':')
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return parseError("Expected : after object key");
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eatWhitespace();
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if (!parseValue(O[std::move(K)]))
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return false;
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eatWhitespace();
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switch (next()) {
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case ',':
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eatWhitespace();
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continue;
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case '}':
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return true;
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default:
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return parseError("Expected , or } after object property");
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}
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}
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}
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default:
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if (isNumber(C))
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return parseNumber(C, Out);
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return parseError("Invalid JSON value");
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}
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}
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bool Parser::parseNumber(char First, Value &Out) {
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// Read the number into a string. (Must be null-terminated for strto*).
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SmallString<24> S;
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S.push_back(First);
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while (isNumber(peek()))
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S.push_back(next());
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char *End;
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// Try first to parse as integer, and if so preserve full 64 bits.
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// strtoll returns long long >= 64 bits, so check it's in range too.
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auto I = std::strtoll(S.c_str(), &End, 10);
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if (End == S.end() && I >= std::numeric_limits<int64_t>::min() &&
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I <= std::numeric_limits<int64_t>::max()) {
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Out = int64_t(I);
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return true;
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}
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// If it's not an integer
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Out = std::strtod(S.c_str(), &End);
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return End == S.end() || parseError("Invalid JSON value (number?)");
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}
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bool Parser::parseString(std::string &Out) {
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// leading quote was already consumed.
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for (char C = next(); C != '"'; C = next()) {
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if (LLVM_UNLIKELY(P == End))
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return parseError("Unterminated string");
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if (LLVM_UNLIKELY((C & 0x1f) == C))
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return parseError("Control character in string");
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if (LLVM_LIKELY(C != '\\')) {
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Out.push_back(C);
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continue;
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}
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// Handle escape sequence.
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switch (C = next()) {
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case '"':
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case '\\':
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case '/':
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Out.push_back(C);
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break;
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case 'b':
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Out.push_back('\b');
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break;
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case 'f':
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Out.push_back('\f');
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break;
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case 'n':
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Out.push_back('\n');
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break;
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case 'r':
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Out.push_back('\r');
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break;
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case 't':
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Out.push_back('\t');
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break;
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case 'u':
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if (!parseUnicode(Out))
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return false;
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break;
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default:
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return parseError("Invalid escape sequence");
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}
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}
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return true;
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}
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static void encodeUtf8(uint32_t Rune, std::string &Out) {
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if (Rune < 0x80) {
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Out.push_back(Rune & 0x7F);
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} else if (Rune < 0x800) {
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uint8_t FirstByte = 0xC0 | ((Rune & 0x7C0) >> 6);
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uint8_t SecondByte = 0x80 | (Rune & 0x3F);
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Out.push_back(FirstByte);
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Out.push_back(SecondByte);
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} else if (Rune < 0x10000) {
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uint8_t FirstByte = 0xE0 | ((Rune & 0xF000) >> 12);
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uint8_t SecondByte = 0x80 | ((Rune & 0xFC0) >> 6);
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uint8_t ThirdByte = 0x80 | (Rune & 0x3F);
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Out.push_back(FirstByte);
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Out.push_back(SecondByte);
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Out.push_back(ThirdByte);
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} else if (Rune < 0x110000) {
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uint8_t FirstByte = 0xF0 | ((Rune & 0x1F0000) >> 18);
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uint8_t SecondByte = 0x80 | ((Rune & 0x3F000) >> 12);
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uint8_t ThirdByte = 0x80 | ((Rune & 0xFC0) >> 6);
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uint8_t FourthByte = 0x80 | (Rune & 0x3F);
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Out.push_back(FirstByte);
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Out.push_back(SecondByte);
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Out.push_back(ThirdByte);
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Out.push_back(FourthByte);
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} else {
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llvm_unreachable("Invalid codepoint");
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}
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}
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// Parse a UTF-16 \uNNNN escape sequence. "\u" has already been consumed.
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// May parse several sequential escapes to ensure proper surrogate handling.
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// We do not use ConvertUTF.h, it can't accept and replace unpaired surrogates.
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// These are invalid Unicode but valid JSON (RFC 8259, section 8.2).
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bool Parser::parseUnicode(std::string &Out) {
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// Invalid UTF is not a JSON error (RFC 8529§8.2). It gets replaced by U+FFFD.
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auto Invalid = [&] { Out.append(/* UTF-8 */ {'\xef', '\xbf', '\xbd'}); };
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// Decodes 4 hex digits from the stream into Out, returns false on error.
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auto Parse4Hex = [this](uint16_t &Out) -> bool {
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Out = 0;
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char Bytes[] = {next(), next(), next(), next()};
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for (unsigned char C : Bytes) {
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if (!std::isxdigit(C))
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return parseError("Invalid \\u escape sequence");
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Out <<= 4;
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Out |= (C > '9') ? (C & ~0x20) - 'A' + 10 : (C - '0');
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}
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return true;
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};
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uint16_t First; // UTF-16 code unit from the first \u escape.
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if (!Parse4Hex(First))
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return false;
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|
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// We loop to allow proper surrogate-pair error handling.
|
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while (true) {
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// Case 1: the UTF-16 code unit is already a codepoint in the BMP.
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if (LLVM_LIKELY(First < 0xD800 || First >= 0xE000)) {
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encodeUtf8(First, Out);
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return true;
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}
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|
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// Case 2: it's an (unpaired) trailing surrogate.
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if (LLVM_UNLIKELY(First >= 0xDC00)) {
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Invalid();
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return true;
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}
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|
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// Case 3: it's a leading surrogate. We expect a trailing one next.
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// Case 3a: there's no trailing \u escape. Don't advance in the stream.
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if (LLVM_UNLIKELY(P + 2 > End || *P != '\\' || *(P + 1) != 'u')) {
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Invalid(); // Leading surrogate was unpaired.
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return true;
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}
|
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P += 2;
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uint16_t Second;
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if (!Parse4Hex(Second))
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return false;
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// Case 3b: there was another \u escape, but it wasn't a trailing surrogate.
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if (LLVM_UNLIKELY(Second < 0xDC00 || Second >= 0xE000)) {
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Invalid(); // Leading surrogate was unpaired.
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First = Second; // Second escape still needs to be processed.
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continue;
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}
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// Case 3c: a valid surrogate pair encoding an astral codepoint.
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encodeUtf8(0x10000 | ((First - 0xD800) << 10) | (Second - 0xDC00), Out);
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return true;
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}
|
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}
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|
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bool Parser::parseError(const char *Msg) {
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int Line = 1;
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const char *StartOfLine = Start;
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for (const char *X = Start; X < P; ++X) {
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if (*X == 0x0A) {
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++Line;
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StartOfLine = X + 1;
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}
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}
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Err.emplace(
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llvm::make_unique<ParseError>(Msg, Line, P - StartOfLine, P - Start));
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return false;
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}
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} // namespace
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|
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Expected<Value> parse(StringRef JSON) {
|
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Parser P(JSON);
|
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Value E = nullptr;
|
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if (P.checkUTF8())
|
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if (P.parseValue(E))
|
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if (P.assertEnd())
|
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return std::move(E);
|
|
return P.takeError();
|
|
}
|
|
char ParseError::ID = 0;
|
|
|
|
static std::vector<const Object::value_type *> sortedElements(const Object &O) {
|
|
std::vector<const Object::value_type *> Elements;
|
|
for (const auto &E : O)
|
|
Elements.push_back(&E);
|
|
llvm::sort(Elements,
|
|
[](const Object::value_type *L, const Object::value_type *R) {
|
|
return L->first < R->first;
|
|
});
|
|
return Elements;
|
|
}
|
|
|
|
bool isUTF8(llvm::StringRef S, size_t *ErrOffset) {
|
|
// Fast-path for ASCII, which is valid UTF-8.
|
|
if (LLVM_LIKELY(isASCII(S)))
|
|
return true;
|
|
|
|
const UTF8 *Data = reinterpret_cast<const UTF8 *>(S.data()), *Rest = Data;
|
|
if (LLVM_LIKELY(isLegalUTF8String(&Rest, Data + S.size())))
|
|
return true;
|
|
|
|
if (ErrOffset)
|
|
*ErrOffset = Rest - Data;
|
|
return false;
|
|
}
|
|
|
|
std::string fixUTF8(llvm::StringRef S) {
|
|
// This isn't particularly efficient, but is only for error-recovery.
|
|
std::vector<UTF32> Codepoints(S.size()); // 1 codepoint per byte suffices.
|
|
const UTF8 *In8 = reinterpret_cast<const UTF8 *>(S.data());
|
|
UTF32 *Out32 = Codepoints.data();
|
|
ConvertUTF8toUTF32(&In8, In8 + S.size(), &Out32, Out32 + Codepoints.size(),
|
|
lenientConversion);
|
|
Codepoints.resize(Out32 - Codepoints.data());
|
|
std::string Res(4 * Codepoints.size(), 0); // 4 bytes per codepoint suffice
|
|
const UTF32 *In32 = Codepoints.data();
|
|
UTF8 *Out8 = reinterpret_cast<UTF8 *>(&Res[0]);
|
|
ConvertUTF32toUTF8(&In32, In32 + Codepoints.size(), &Out8, Out8 + Res.size(),
|
|
strictConversion);
|
|
Res.resize(reinterpret_cast<char *>(Out8) - Res.data());
|
|
return Res;
|
|
}
|
|
|
|
static void quote(llvm::raw_ostream &OS, llvm::StringRef S) {
|
|
OS << '\"';
|
|
for (unsigned char C : S) {
|
|
if (C == 0x22 || C == 0x5C)
|
|
OS << '\\';
|
|
if (C >= 0x20) {
|
|
OS << C;
|
|
continue;
|
|
}
|
|
OS << '\\';
|
|
switch (C) {
|
|
// A few characters are common enough to make short escapes worthwhile.
|
|
case '\t':
|
|
OS << 't';
|
|
break;
|
|
case '\n':
|
|
OS << 'n';
|
|
break;
|
|
case '\r':
|
|
OS << 'r';
|
|
break;
|
|
default:
|
|
OS << 'u';
|
|
llvm::write_hex(OS, C, llvm::HexPrintStyle::Lower, 4);
|
|
break;
|
|
}
|
|
}
|
|
OS << '\"';
|
|
}
|
|
|
|
void llvm::json::OStream::value(const Value &V) {
|
|
switch (V.kind()) {
|
|
case Value::Null:
|
|
valueBegin();
|
|
OS << "null";
|
|
return;
|
|
case Value::Boolean:
|
|
valueBegin();
|
|
OS << (*V.getAsBoolean() ? "true" : "false");
|
|
return;
|
|
case Value::Number:
|
|
valueBegin();
|
|
if (V.Type == Value::T_Integer)
|
|
OS << *V.getAsInteger();
|
|
else
|
|
OS << format("%.*g", std::numeric_limits<double>::max_digits10,
|
|
*V.getAsNumber());
|
|
return;
|
|
case Value::String:
|
|
valueBegin();
|
|
quote(OS, *V.getAsString());
|
|
return;
|
|
case Value::Array:
|
|
return array([&] {
|
|
for (const Value &E : *V.getAsArray())
|
|
value(E);
|
|
});
|
|
case Value::Object:
|
|
return object([&] {
|
|
for (const Object::value_type *E : sortedElements(*V.getAsObject()))
|
|
attribute(E->first, E->second);
|
|
});
|
|
}
|
|
}
|
|
|
|
void llvm::json::OStream::valueBegin() {
|
|
assert(Stack.back().Ctx != Object && "Only attributes allowed here");
|
|
if (Stack.back().HasValue) {
|
|
assert(Stack.back().Ctx != Singleton && "Only one value allowed here");
|
|
OS << ',';
|
|
}
|
|
if (Stack.back().Ctx == Array)
|
|
newline();
|
|
Stack.back().HasValue = true;
|
|
}
|
|
|
|
void llvm::json::OStream::newline() {
|
|
if (IndentSize) {
|
|
OS.write('\n');
|
|
OS.indent(Indent);
|
|
}
|
|
}
|
|
|
|
void llvm::json::OStream::arrayBegin() {
|
|
valueBegin();
|
|
Stack.emplace_back();
|
|
Stack.back().Ctx = Array;
|
|
Indent += IndentSize;
|
|
OS << '[';
|
|
}
|
|
|
|
void llvm::json::OStream::arrayEnd() {
|
|
assert(Stack.back().Ctx == Array);
|
|
Indent -= IndentSize;
|
|
if (Stack.back().HasValue)
|
|
newline();
|
|
OS << ']';
|
|
Stack.pop_back();
|
|
assert(!Stack.empty());
|
|
}
|
|
|
|
void llvm::json::OStream::objectBegin() {
|
|
valueBegin();
|
|
Stack.emplace_back();
|
|
Stack.back().Ctx = Object;
|
|
Indent += IndentSize;
|
|
OS << '{';
|
|
}
|
|
|
|
void llvm::json::OStream::objectEnd() {
|
|
assert(Stack.back().Ctx == Object);
|
|
Indent -= IndentSize;
|
|
if (Stack.back().HasValue)
|
|
newline();
|
|
OS << '}';
|
|
Stack.pop_back();
|
|
assert(!Stack.empty());
|
|
}
|
|
|
|
void llvm::json::OStream::attributeBegin(llvm::StringRef Key) {
|
|
assert(Stack.back().Ctx == Object);
|
|
if (Stack.back().HasValue)
|
|
OS << ',';
|
|
newline();
|
|
Stack.back().HasValue = true;
|
|
Stack.emplace_back();
|
|
Stack.back().Ctx = Singleton;
|
|
if (LLVM_LIKELY(isUTF8(Key))) {
|
|
quote(OS, Key);
|
|
} else {
|
|
assert(false && "Invalid UTF-8 in attribute key");
|
|
quote(OS, fixUTF8(Key));
|
|
}
|
|
OS.write(':');
|
|
if (IndentSize)
|
|
OS.write(' ');
|
|
}
|
|
|
|
void llvm::json::OStream::attributeEnd() {
|
|
assert(Stack.back().Ctx == Singleton);
|
|
assert(Stack.back().HasValue && "Attribute must have a value");
|
|
Stack.pop_back();
|
|
assert(Stack.back().Ctx == Object);
|
|
}
|
|
|
|
} // namespace json
|
|
} // namespace llvm
|
|
|
|
void llvm::format_provider<llvm::json::Value>::format(
|
|
const llvm::json::Value &E, raw_ostream &OS, StringRef Options) {
|
|
unsigned IndentAmount = 0;
|
|
if (!Options.empty() && Options.getAsInteger(/*Radix=*/10, IndentAmount))
|
|
llvm_unreachable("json::Value format options should be an integer");
|
|
json::OStream(OS, IndentAmount).value(E);
|
|
}
|
|
|