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-rw-r--r--Utilities/cmjsoncpp/src/lib_json/json_reader.cpp2005
1 files changed, 2005 insertions, 0 deletions
diff --git a/Utilities/cmjsoncpp/src/lib_json/json_reader.cpp b/Utilities/cmjsoncpp/src/lib_json/json_reader.cpp
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+++ b/Utilities/cmjsoncpp/src/lib_json/json_reader.cpp
@@ -0,0 +1,2005 @@
+// Copyright 2007-2011 Baptiste Lepilleur and The JsonCpp Authors
+// Copyright (C) 2016 InfoTeCS JSC. All rights reserved.
+// Distributed under MIT license, or public domain if desired and
+// recognized in your jurisdiction.
+// See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
+
+#if !defined(JSON_IS_AMALGAMATION)
+#include "json_tool.h"
+#include <json/assertions.h>
+#include <json/reader.h>
+#include <json/value.h>
+#endif // if !defined(JSON_IS_AMALGAMATION)
+#include <algorithm>
+#include <cassert>
+#include <cmath>
+#include <cstring>
+#include <iostream>
+#include <istream>
+#include <limits>
+#include <memory>
+#include <set>
+#include <sstream>
+#include <utility>
+
+#include <cstdio>
+#if __cplusplus >= 201103L
+
+#if !defined(sscanf)
+#define sscanf std::sscanf
+#endif
+
+#endif //__cplusplus
+
+#if defined(_MSC_VER)
+#if !defined(_CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES)
+#define _CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES 1
+#endif //_CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES
+#endif //_MSC_VER
+
+#if defined(_MSC_VER)
+// Disable warning about strdup being deprecated.
+#pragma warning(disable : 4996)
+#endif
+
+// Define JSONCPP_DEPRECATED_STACK_LIMIT as an appropriate integer at compile
+// time to change the stack limit
+#if !defined(JSONCPP_DEPRECATED_STACK_LIMIT)
+#define JSONCPP_DEPRECATED_STACK_LIMIT 1000
+#endif
+
+static size_t const stackLimit_g =
+ JSONCPP_DEPRECATED_STACK_LIMIT; // see readValue()
+
+namespace Json {
+
+#if __cplusplus >= 201103L || (defined(_CPPLIB_VER) && _CPPLIB_VER >= 520)
+using CharReaderPtr = std::unique_ptr<CharReader>;
+#else
+using CharReaderPtr = std::auto_ptr<CharReader>;
+#endif
+
+// Implementation of class Features
+// ////////////////////////////////
+
+Features::Features() = default;
+
+Features Features::all() { return {}; }
+
+Features Features::strictMode() {
+ Features features;
+ features.allowComments_ = false;
+ features.strictRoot_ = true;
+ features.allowDroppedNullPlaceholders_ = false;
+ features.allowNumericKeys_ = false;
+ return features;
+}
+
+// Implementation of class Reader
+// ////////////////////////////////
+
+bool Reader::containsNewLine(Reader::Location begin, Reader::Location end) {
+ return std::any_of(begin, end, [](char b) { return b == '\n' || b == '\r'; });
+}
+
+// Class Reader
+// //////////////////////////////////////////////////////////////////
+
+Reader::Reader() : features_(Features::all()) {}
+
+Reader::Reader(const Features& features) : features_(features) {}
+
+bool Reader::parse(const std::string& document, Value& root,
+ bool collectComments) {
+ document_.assign(document.begin(), document.end());
+ const char* begin = document_.c_str();
+ const char* end = begin + document_.length();
+ return parse(begin, end, root, collectComments);
+}
+
+bool Reader::parse(std::istream& is, Value& root, bool collectComments) {
+ // std::istream_iterator<char> begin(is);
+ // std::istream_iterator<char> end;
+ // Those would allow streamed input from a file, if parse() were a
+ // template function.
+
+ // Since String is reference-counted, this at least does not
+ // create an extra copy.
+ String doc(std::istreambuf_iterator<char>(is), {});
+ return parse(doc.data(), doc.data() + doc.size(), root, collectComments);
+}
+
+bool Reader::parse(const char* beginDoc, const char* endDoc, Value& root,
+ bool collectComments) {
+ if (!features_.allowComments_) {
+ collectComments = false;
+ }
+
+ begin_ = beginDoc;
+ end_ = endDoc;
+ collectComments_ = collectComments;
+ current_ = begin_;
+ lastValueEnd_ = nullptr;
+ lastValue_ = nullptr;
+ commentsBefore_.clear();
+ errors_.clear();
+ while (!nodes_.empty())
+ nodes_.pop();
+ nodes_.push(&root);
+
+ bool successful = readValue();
+ Token token;
+ skipCommentTokens(token);
+ if (collectComments_ && !commentsBefore_.empty())
+ root.setComment(commentsBefore_, commentAfter);
+ if (features_.strictRoot_) {
+ if (!root.isArray() && !root.isObject()) {
+ // Set error location to start of doc, ideally should be first token found
+ // in doc
+ token.type_ = tokenError;
+ token.start_ = beginDoc;
+ token.end_ = endDoc;
+ addError(
+ "A valid JSON document must be either an array or an object value.",
+ token);
+ return false;
+ }
+ }
+ return successful;
+}
+
+bool Reader::readValue() {
+ // readValue() may call itself only if it calls readObject() or ReadArray().
+ // These methods execute nodes_.push() just before and nodes_.pop)() just
+ // after calling readValue(). parse() executes one nodes_.push(), so > instead
+ // of >=.
+ if (nodes_.size() > stackLimit_g)
+ throwRuntimeError("Exceeded stackLimit in readValue().");
+
+ Token token;
+ skipCommentTokens(token);
+ bool successful = true;
+
+ if (collectComments_ && !commentsBefore_.empty()) {
+ currentValue().setComment(commentsBefore_, commentBefore);
+ commentsBefore_.clear();
+ }
+
+ switch (token.type_) {
+ case tokenObjectBegin:
+ successful = readObject(token);
+ currentValue().setOffsetLimit(current_ - begin_);
+ break;
+ case tokenArrayBegin:
+ successful = readArray(token);
+ currentValue().setOffsetLimit(current_ - begin_);
+ break;
+ case tokenNumber:
+ successful = decodeNumber(token);
+ break;
+ case tokenString:
+ successful = decodeString(token);
+ break;
+ case tokenTrue: {
+ Value v(true);
+ currentValue().swapPayload(v);
+ currentValue().setOffsetStart(token.start_ - begin_);
+ currentValue().setOffsetLimit(token.end_ - begin_);
+ } break;
+ case tokenFalse: {
+ Value v(false);
+ currentValue().swapPayload(v);
+ currentValue().setOffsetStart(token.start_ - begin_);
+ currentValue().setOffsetLimit(token.end_ - begin_);
+ } break;
+ case tokenNull: {
+ Value v;
+ currentValue().swapPayload(v);
+ currentValue().setOffsetStart(token.start_ - begin_);
+ currentValue().setOffsetLimit(token.end_ - begin_);
+ } break;
+ case tokenArraySeparator:
+ case tokenObjectEnd:
+ case tokenArrayEnd:
+ if (features_.allowDroppedNullPlaceholders_) {
+ // "Un-read" the current token and mark the current value as a null
+ // token.
+ current_--;
+ Value v;
+ currentValue().swapPayload(v);
+ currentValue().setOffsetStart(current_ - begin_ - 1);
+ currentValue().setOffsetLimit(current_ - begin_);
+ break;
+ } // Else, fall through...
+ default:
+ currentValue().setOffsetStart(token.start_ - begin_);
+ currentValue().setOffsetLimit(token.end_ - begin_);
+ return addError("Syntax error: value, object or array expected.", token);
+ }
+
+ if (collectComments_) {
+ lastValueEnd_ = current_;
+ lastValue_ = &currentValue();
+ }
+
+ return successful;
+}
+
+void Reader::skipCommentTokens(Token& token) {
+ if (features_.allowComments_) {
+ do {
+ readToken(token);
+ } while (token.type_ == tokenComment);
+ } else {
+ readToken(token);
+ }
+}
+
+bool Reader::readToken(Token& token) {
+ skipSpaces();
+ token.start_ = current_;
+ Char c = getNextChar();
+ bool ok = true;
+ switch (c) {
+ case '{':
+ token.type_ = tokenObjectBegin;
+ break;
+ case '}':
+ token.type_ = tokenObjectEnd;
+ break;
+ case '[':
+ token.type_ = tokenArrayBegin;
+ break;
+ case ']':
+ token.type_ = tokenArrayEnd;
+ break;
+ case '"':
+ token.type_ = tokenString;
+ ok = readString();
+ break;
+ case '/':
+ token.type_ = tokenComment;
+ ok = readComment();
+ break;
+ case '0':
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7':
+ case '8':
+ case '9':
+ case '-':
+ token.type_ = tokenNumber;
+ readNumber();
+ break;
+ case 't':
+ token.type_ = tokenTrue;
+ ok = match("rue", 3);
+ break;
+ case 'f':
+ token.type_ = tokenFalse;
+ ok = match("alse", 4);
+ break;
+ case 'n':
+ token.type_ = tokenNull;
+ ok = match("ull", 3);
+ break;
+ case ',':
+ token.type_ = tokenArraySeparator;
+ break;
+ case ':':
+ token.type_ = tokenMemberSeparator;
+ break;
+ case 0:
+ token.type_ = tokenEndOfStream;
+ break;
+ default:
+ ok = false;
+ break;
+ }
+ if (!ok)
+ token.type_ = tokenError;
+ token.end_ = current_;
+ return ok;
+}
+
+void Reader::skipSpaces() {
+ while (current_ != end_) {
+ Char c = *current_;
+ if (c == ' ' || c == '\t' || c == '\r' || c == '\n')
+ ++current_;
+ else
+ break;
+ }
+}
+
+bool Reader::match(const Char* pattern, int patternLength) {
+ if (end_ - current_ < patternLength)
+ return false;
+ int index = patternLength;
+ while (index--)
+ if (current_[index] != pattern[index])
+ return false;
+ current_ += patternLength;
+ return true;
+}
+
+bool Reader::readComment() {
+ Location commentBegin = current_ - 1;
+ Char c = getNextChar();
+ bool successful = false;
+ if (c == '*')
+ successful = readCStyleComment();
+ else if (c == '/')
+ successful = readCppStyleComment();
+ if (!successful)
+ return false;
+
+ if (collectComments_) {
+ CommentPlacement placement = commentBefore;
+ if (lastValueEnd_ && !containsNewLine(lastValueEnd_, commentBegin)) {
+ if (c != '*' || !containsNewLine(commentBegin, current_))
+ placement = commentAfterOnSameLine;
+ }
+
+ addComment(commentBegin, current_, placement);
+ }
+ return true;
+}
+
+String Reader::normalizeEOL(Reader::Location begin, Reader::Location end) {
+ String normalized;
+ normalized.reserve(static_cast<size_t>(end - begin));
+ Reader::Location current = begin;
+ while (current != end) {
+ char c = *current++;
+ if (c == '\r') {
+ if (current != end && *current == '\n')
+ // convert dos EOL
+ ++current;
+ // convert Mac EOL
+ normalized += '\n';
+ } else {
+ normalized += c;
+ }
+ }
+ return normalized;
+}
+
+void Reader::addComment(Location begin, Location end,
+ CommentPlacement placement) {
+ assert(collectComments_);
+ const String& normalized = normalizeEOL(begin, end);
+ if (placement == commentAfterOnSameLine) {
+ assert(lastValue_ != nullptr);
+ lastValue_->setComment(normalized, placement);
+ } else {
+ commentsBefore_ += normalized;
+ }
+}
+
+bool Reader::readCStyleComment() {
+ while ((current_ + 1) < end_) {
+ Char c = getNextChar();
+ if (c == '*' && *current_ == '/')
+ break;
+ }
+ return getNextChar() == '/';
+}
+
+bool Reader::readCppStyleComment() {
+ while (current_ != end_) {
+ Char c = getNextChar();
+ if (c == '\n')
+ break;
+ if (c == '\r') {
+ // Consume DOS EOL. It will be normalized in addComment.
+ if (current_ != end_ && *current_ == '\n')
+ getNextChar();
+ // Break on Moc OS 9 EOL.
+ break;
+ }
+ }
+ return true;
+}
+
+void Reader::readNumber() {
+ Location p = current_;
+ char c = '0'; // stopgap for already consumed character
+ // integral part
+ while (c >= '0' && c <= '9')
+ c = (current_ = p) < end_ ? *p++ : '\0';
+ // fractional part
+ if (c == '.') {
+ c = (current_ = p) < end_ ? *p++ : '\0';
+ while (c >= '0' && c <= '9')
+ c = (current_ = p) < end_ ? *p++ : '\0';
+ }
+ // exponential part
+ if (c == 'e' || c == 'E') {
+ c = (current_ = p) < end_ ? *p++ : '\0';
+ if (c == '+' || c == '-')
+ c = (current_ = p) < end_ ? *p++ : '\0';
+ while (c >= '0' && c <= '9')
+ c = (current_ = p) < end_ ? *p++ : '\0';
+ }
+}
+
+bool Reader::readString() {
+ Char c = '\0';
+ while (current_ != end_) {
+ c = getNextChar();
+ if (c == '\\')
+ getNextChar();
+ else if (c == '"')
+ break;
+ }
+ return c == '"';
+}
+
+bool Reader::readObject(Token& token) {
+ Token tokenName;
+ String name;
+ Value init(objectValue);
+ currentValue().swapPayload(init);
+ currentValue().setOffsetStart(token.start_ - begin_);
+ while (readToken(tokenName)) {
+ bool initialTokenOk = true;
+ while (tokenName.type_ == tokenComment && initialTokenOk)
+ initialTokenOk = readToken(tokenName);
+ if (!initialTokenOk)
+ break;
+ if (tokenName.type_ == tokenObjectEnd && name.empty()) // empty object
+ return true;
+ name.clear();
+ if (tokenName.type_ == tokenString) {
+ if (!decodeString(tokenName, name))
+ return recoverFromError(tokenObjectEnd);
+ } else if (tokenName.type_ == tokenNumber && features_.allowNumericKeys_) {
+ Value numberName;
+ if (!decodeNumber(tokenName, numberName))
+ return recoverFromError(tokenObjectEnd);
+ name = numberName.asString();
+ } else {
+ break;
+ }
+
+ Token colon;
+ if (!readToken(colon) || colon.type_ != tokenMemberSeparator) {
+ return addErrorAndRecover("Missing ':' after object member name", colon,
+ tokenObjectEnd);
+ }
+ Value& value = currentValue()[name];
+ nodes_.push(&value);
+ bool ok = readValue();
+ nodes_.pop();
+ if (!ok) // error already set
+ return recoverFromError(tokenObjectEnd);
+
+ Token comma;
+ if (!readToken(comma) ||
+ (comma.type_ != tokenObjectEnd && comma.type_ != tokenArraySeparator &&
+ comma.type_ != tokenComment)) {
+ return addErrorAndRecover("Missing ',' or '}' in object declaration",
+ comma, tokenObjectEnd);
+ }
+ bool finalizeTokenOk = true;
+ while (comma.type_ == tokenComment && finalizeTokenOk)
+ finalizeTokenOk = readToken(comma);
+ if (comma.type_ == tokenObjectEnd)
+ return true;
+ }
+ return addErrorAndRecover("Missing '}' or object member name", tokenName,
+ tokenObjectEnd);
+}
+
+bool Reader::readArray(Token& token) {
+ Value init(arrayValue);
+ currentValue().swapPayload(init);
+ currentValue().setOffsetStart(token.start_ - begin_);
+ skipSpaces();
+ if (current_ != end_ && *current_ == ']') // empty array
+ {
+ Token endArray;
+ readToken(endArray);
+ return true;
+ }
+ int index = 0;
+ for (;;) {
+ Value& value = currentValue()[index++];
+ nodes_.push(&value);
+ bool ok = readValue();
+ nodes_.pop();
+ if (!ok) // error already set
+ return recoverFromError(tokenArrayEnd);
+
+ Token currentToken;
+ // Accept Comment after last item in the array.
+ ok = readToken(currentToken);
+ while (currentToken.type_ == tokenComment && ok) {
+ ok = readToken(currentToken);
+ }
+ bool badTokenType = (currentToken.type_ != tokenArraySeparator &&
+ currentToken.type_ != tokenArrayEnd);
+ if (!ok || badTokenType) {
+ return addErrorAndRecover("Missing ',' or ']' in array declaration",
+ currentToken, tokenArrayEnd);
+ }
+ if (currentToken.type_ == tokenArrayEnd)
+ break;
+ }
+ return true;
+}
+
+bool Reader::decodeNumber(Token& token) {
+ Value decoded;
+ if (!decodeNumber(token, decoded))
+ return false;
+ currentValue().swapPayload(decoded);
+ currentValue().setOffsetStart(token.start_ - begin_);
+ currentValue().setOffsetLimit(token.end_ - begin_);
+ return true;
+}
+
+bool Reader::decodeNumber(Token& token, Value& decoded) {
+ // Attempts to parse the number as an integer. If the number is
+ // larger than the maximum supported value of an integer then
+ // we decode the number as a double.
+ Location current = token.start_;
+ bool isNegative = *current == '-';
+ if (isNegative)
+ ++current;
+ // TODO: Help the compiler do the div and mod at compile time or get rid of
+ // them.
+ Value::LargestUInt maxIntegerValue =
+ isNegative ? Value::LargestUInt(Value::maxLargestInt) + 1
+ : Value::maxLargestUInt;
+ Value::LargestUInt threshold = maxIntegerValue / 10;
+ Value::LargestUInt value = 0;
+ while (current < token.end_) {
+ Char c = *current++;
+ if (c < '0' || c > '9')
+ return decodeDouble(token, decoded);
+ auto digit(static_cast<Value::UInt>(c - '0'));
+ if (value >= threshold) {
+ // We've hit or exceeded the max value divided by 10 (rounded down). If
+ // a) we've only just touched the limit, b) this is the last digit, and
+ // c) it's small enough to fit in that rounding delta, we're okay.
+ // Otherwise treat this number as a double to avoid overflow.
+ if (value > threshold || current != token.end_ ||
+ digit > maxIntegerValue % 10) {
+ return decodeDouble(token, decoded);
+ }
+ }
+ value = value * 10 + digit;
+ }
+ if (isNegative && value == maxIntegerValue)
+ decoded = Value::minLargestInt;
+ else if (isNegative)
+ decoded = -Value::LargestInt(value);
+ else if (value <= Value::LargestUInt(Value::maxInt))
+ decoded = Value::LargestInt(value);
+ else
+ decoded = value;
+ return true;
+}
+
+bool Reader::decodeDouble(Token& token) {
+ Value decoded;
+ if (!decodeDouble(token, decoded))
+ return false;
+ currentValue().swapPayload(decoded);
+ currentValue().setOffsetStart(token.start_ - begin_);
+ currentValue().setOffsetLimit(token.end_ - begin_);
+ return true;
+}
+
+bool Reader::decodeDouble(Token& token, Value& decoded) {
+ double value = 0;
+ String buffer(token.start_, token.end_);
+ IStringStream is(buffer);
+ if (!(is >> value)) {
+ if (value == std::numeric_limits<double>::max())
+ value = std::numeric_limits<double>::infinity();
+ else if (value == std::numeric_limits<double>::lowest())
+ value = -std::numeric_limits<double>::infinity();
+ else if (!std::isinf(value))
+ return addError(
+ "'" + String(token.start_, token.end_) + "' is not a number.", token);
+ }
+ decoded = value;
+ return true;
+}
+
+bool Reader::decodeString(Token& token) {
+ String decoded_string;
+ if (!decodeString(token, decoded_string))
+ return false;
+ Value decoded(decoded_string);
+ currentValue().swapPayload(decoded);
+ currentValue().setOffsetStart(token.start_ - begin_);
+ currentValue().setOffsetLimit(token.end_ - begin_);
+ return true;
+}
+
+bool Reader::decodeString(Token& token, String& decoded) {
+ decoded.reserve(static_cast<size_t>(token.end_ - token.start_ - 2));
+ Location current = token.start_ + 1; // skip '"'
+ Location end = token.end_ - 1; // do not include '"'
+ while (current != end) {
+ Char c = *current++;
+ if (c == '"')
+ break;
+ if (c == '\\') {
+ if (current == end)
+ return addError("Empty escape sequence in string", token, current);
+ Char escape = *current++;
+ switch (escape) {
+ case '"':
+ decoded += '"';
+ break;
+ case '/':
+ decoded += '/';
+ break;
+ case '\\':
+ decoded += '\\';
+ break;
+ case 'b':
+ decoded += '\b';
+ break;
+ case 'f':
+ decoded += '\f';
+ break;
+ case 'n':
+ decoded += '\n';
+ break;
+ case 'r':
+ decoded += '\r';
+ break;
+ case 't':
+ decoded += '\t';
+ break;
+ case 'u': {
+ unsigned int unicode;
+ if (!decodeUnicodeCodePoint(token, current, end, unicode))
+ return false;
+ decoded += codePointToUTF8(unicode);
+ } break;
+ default:
+ return addError("Bad escape sequence in string", token, current);
+ }
+ } else {
+ decoded += c;
+ }
+ }
+ return true;
+}
+
+bool Reader::decodeUnicodeCodePoint(Token& token, Location& current,
+ Location end, unsigned int& unicode) {
+
+ if (!decodeUnicodeEscapeSequence(token, current, end, unicode))
+ return false;
+ if (unicode >= 0xD800 && unicode <= 0xDBFF) {
+ // surrogate pairs
+ if (end - current < 6)
+ return addError(
+ "additional six characters expected to parse unicode surrogate pair.",
+ token, current);
+ if (*(current++) == '\\' && *(current++) == 'u') {
+ unsigned int surrogatePair;
+ if (decodeUnicodeEscapeSequence(token, current, end, surrogatePair)) {
+ unicode = 0x10000 + ((unicode & 0x3FF) << 10) + (surrogatePair & 0x3FF);
+ } else
+ return false;
+ } else
+ return addError("expecting another \\u token to begin the second half of "
+ "a unicode surrogate pair",
+ token, current);
+ }
+ return true;
+}
+
+bool Reader::decodeUnicodeEscapeSequence(Token& token, Location& current,
+ Location end,
+ unsigned int& ret_unicode) {
+ if (end - current < 4)
+ return addError(
+ "Bad unicode escape sequence in string: four digits expected.", token,
+ current);
+ int unicode = 0;
+ for (int index = 0; index < 4; ++index) {
+ Char c = *current++;
+ unicode *= 16;
+ if (c >= '0' && c <= '9')
+ unicode += c - '0';
+ else if (c >= 'a' && c <= 'f')
+ unicode += c - 'a' + 10;
+ else if (c >= 'A' && c <= 'F')
+ unicode += c - 'A' + 10;
+ else
+ return addError(
+ "Bad unicode escape sequence in string: hexadecimal digit expected.",
+ token, current);
+ }
+ ret_unicode = static_cast<unsigned int>(unicode);
+ return true;
+}
+
+bool Reader::addError(const String& message, Token& token, Location extra) {
+ ErrorInfo info;
+ info.token_ = token;
+ info.message_ = message;
+ info.extra_ = extra;
+ errors_.push_back(info);
+ return false;
+}
+
+bool Reader::recoverFromError(TokenType skipUntilToken) {
+ size_t const errorCount = errors_.size();
+ Token skip;
+ for (;;) {
+ if (!readToken(skip))
+ errors_.resize(errorCount); // discard errors caused by recovery
+ if (skip.type_ == skipUntilToken || skip.type_ == tokenEndOfStream)
+ break;
+ }
+ errors_.resize(errorCount);
+ return false;
+}
+
+bool Reader::addErrorAndRecover(const String& message, Token& token,
+ TokenType skipUntilToken) {
+ addError(message, token);
+ return recoverFromError(skipUntilToken);
+}
+
+Value& Reader::currentValue() { return *(nodes_.top()); }
+
+Reader::Char Reader::getNextChar() {
+ if (current_ == end_)
+ return 0;
+ return *current_++;
+}
+
+void Reader::getLocationLineAndColumn(Location location, int& line,
+ int& column) const {
+ Location current = begin_;
+ Location lastLineStart = current;
+ line = 0;
+ while (current < location && current != end_) {
+ Char c = *current++;
+ if (c == '\r') {
+ if (*current == '\n')
+ ++current;
+ lastLineStart = current;
+ ++line;
+ } else if (c == '\n') {
+ lastLineStart = current;
+ ++line;
+ }
+ }
+ // column & line start at 1
+ column = int(location - lastLineStart) + 1;
+ ++line;
+}
+
+String Reader::getLocationLineAndColumn(Location location) const {
+ int line, column;
+ getLocationLineAndColumn(location, line, column);
+ char buffer[18 + 16 + 16 + 1];
+ jsoncpp_snprintf(buffer, sizeof(buffer), "Line %d, Column %d", line, column);
+ return buffer;
+}
+
+// Deprecated. Preserved for backward compatibility
+String Reader::getFormatedErrorMessages() const {
+ return getFormattedErrorMessages();
+}
+
+String Reader::getFormattedErrorMessages() const {
+ String formattedMessage;
+ for (const auto& error : errors_) {
+ formattedMessage +=
+ "* " + getLocationLineAndColumn(error.token_.start_) + "\n";
+ formattedMessage += " " + error.message_ + "\n";
+ if (error.extra_)
+ formattedMessage +=
+ "See " + getLocationLineAndColumn(error.extra_) + " for detail.\n";
+ }
+ return formattedMessage;
+}
+
+std::vector<Reader::StructuredError> Reader::getStructuredErrors() const {
+ std::vector<Reader::StructuredError> allErrors;
+ for (const auto& error : errors_) {
+ Reader::StructuredError structured;
+ structured.offset_start = error.token_.start_ - begin_;
+ structured.offset_limit = error.token_.end_ - begin_;
+ structured.message = error.message_;
+ allErrors.push_back(structured);
+ }
+ return allErrors;
+}
+
+bool Reader::pushError(const Value& value, const String& message) {
+ ptrdiff_t const length = end_ - begin_;
+ if (value.getOffsetStart() > length || value.getOffsetLimit() > length)
+ return false;
+ Token token;
+ token.type_ = tokenError;
+ token.start_ = begin_ + value.getOffsetStart();
+ token.end_ = begin_ + value.getOffsetLimit();
+ ErrorInfo info;
+ info.token_ = token;
+ info.message_ = message;
+ info.extra_ = nullptr;
+ errors_.push_back(info);
+ return true;
+}
+
+bool Reader::pushError(const Value& value, const String& message,
+ const Value& extra) {
+ ptrdiff_t const length = end_ - begin_;
+ if (value.getOffsetStart() > length || value.getOffsetLimit() > length ||
+ extra.getOffsetLimit() > length)
+ return false;
+ Token token;
+ token.type_ = tokenError;
+ token.start_ = begin_ + value.getOffsetStart();
+ token.end_ = begin_ + value.getOffsetLimit();
+ ErrorInfo info;
+ info.token_ = token;
+ info.message_ = message;
+ info.extra_ = begin_ + extra.getOffsetStart();
+ errors_.push_back(info);
+ return true;
+}
+
+bool Reader::good() const { return errors_.empty(); }
+
+// Originally copied from the Features class (now deprecated), used internally
+// for features implementation.
+class OurFeatures {
+public:
+ static OurFeatures all();
+ bool allowComments_;
+ bool allowTrailingCommas_;
+ bool strictRoot_;
+ bool allowDroppedNullPlaceholders_;
+ bool allowNumericKeys_;
+ bool allowSingleQuotes_;
+ bool failIfExtra_;
+ bool rejectDupKeys_;
+ bool allowSpecialFloats_;
+ bool skipBom_;
+ size_t stackLimit_;
+}; // OurFeatures
+
+OurFeatures OurFeatures::all() { return {}; }
+
+// Implementation of class Reader
+// ////////////////////////////////
+
+// Originally copied from the Reader class (now deprecated), used internally
+// for implementing JSON reading.
+class OurReader {
+public:
+ using Char = char;
+ using Location = const Char*;
+ struct StructuredError {
+ ptrdiff_t offset_start;
+ ptrdiff_t offset_limit;
+ String message;
+ };
+
+ explicit OurReader(OurFeatures const& features);
+ bool parse(const char* beginDoc, const char* endDoc, Value& root,
+ bool collectComments = true);
+ String getFormattedErrorMessages() const;
+ std::vector<StructuredError> getStructuredErrors() const;
+
+private:
+ OurReader(OurReader const&); // no impl
+ void operator=(OurReader const&); // no impl
+
+ enum TokenType {
+ tokenEndOfStream = 0,
+ tokenObjectBegin,
+ tokenObjectEnd,
+ tokenArrayBegin,
+ tokenArrayEnd,
+ tokenString,
+ tokenNumber,
+ tokenTrue,
+ tokenFalse,
+ tokenNull,
+ tokenNaN,
+ tokenPosInf,
+ tokenNegInf,
+ tokenArraySeparator,
+ tokenMemberSeparator,
+ tokenComment,
+ tokenError
+ };
+
+ class Token {
+ public:
+ TokenType type_;
+ Location start_;
+ Location end_;
+ };
+
+ class ErrorInfo {
+ public:
+ Token token_;
+ String message_;
+ Location extra_;
+ };
+
+ using Errors = std::deque<ErrorInfo>;
+
+ bool readToken(Token& token);
+ void skipSpaces();
+ void skipBom(bool skipBom);
+ bool match(const Char* pattern, int patternLength);
+ bool readComment();
+ bool readCStyleComment(bool* containsNewLineResult);
+ bool readCppStyleComment();
+ bool readString();
+ bool readStringSingleQuote();
+ bool readNumber(bool checkInf);
+ bool readValue();
+ bool readObject(Token& token);
+ bool readArray(Token& token);
+ bool decodeNumber(Token& token);
+ bool decodeNumber(Token& token, Value& decoded);
+ bool decodeString(Token& token);
+ bool decodeString(Token& token, String& decoded);
+ bool decodeDouble(Token& token);
+ bool decodeDouble(Token& token, Value& decoded);
+ bool decodeUnicodeCodePoint(Token& token, Location& current, Location end,
+ unsigned int& unicode);
+ bool decodeUnicodeEscapeSequence(Token& token, Location& current,
+ Location end, unsigned int& unicode);
+ bool addError(const String& message, Token& token, Location extra = nullptr);
+ bool recoverFromError(TokenType skipUntilToken);
+ bool addErrorAndRecover(const String& message, Token& token,
+ TokenType skipUntilToken);
+ void skipUntilSpace();
+ Value& currentValue();
+ Char getNextChar();
+ void getLocationLineAndColumn(Location location, int& line,
+ int& column) const;
+ String getLocationLineAndColumn(Location location) const;
+ void addComment(Location begin, Location end, CommentPlacement placement);
+ void skipCommentTokens(Token& token);
+
+ static String normalizeEOL(Location begin, Location end);
+ static bool containsNewLine(Location begin, Location end);
+
+ using Nodes = std::stack<Value*>;
+
+ Nodes nodes_{};
+ Errors errors_{};
+ String document_{};
+ Location begin_ = nullptr;
+ Location end_ = nullptr;
+ Location current_ = nullptr;
+ Location lastValueEnd_ = nullptr;
+ Value* lastValue_ = nullptr;
+ bool lastValueHasAComment_ = false;
+ String commentsBefore_{};
+
+ OurFeatures const features_;
+ bool collectComments_ = false;
+}; // OurReader
+
+// complete copy of Read impl, for OurReader
+
+bool OurReader::containsNewLine(OurReader::Location begin,
+ OurReader::Location end) {
+ return std::any_of(begin, end, [](char b) { return b == '\n' || b == '\r'; });
+}
+
+OurReader::OurReader(OurFeatures const& features) : features_(features) {}
+
+bool OurReader::parse(const char* beginDoc, const char* endDoc, Value& root,
+ bool collectComments) {
+ if (!features_.allowComments_) {
+ collectComments = false;
+ }
+
+ begin_ = beginDoc;
+ end_ = endDoc;
+ collectComments_ = collectComments;
+ current_ = begin_;
+ lastValueEnd_ = nullptr;
+ lastValue_ = nullptr;
+ commentsBefore_.clear();
+ errors_.clear();
+ while (!nodes_.empty())
+ nodes_.pop();
+ nodes_.push(&root);
+
+ // skip byte order mark if it exists at the beginning of the UTF-8 text.
+ skipBom(features_.skipBom_);
+ bool successful = readValue();
+ nodes_.pop();
+ Token token;
+ skipCommentTokens(token);
+ if (features_.failIfExtra_ && (token.type_ != tokenEndOfStream)) {
+ addError("Extra non-whitespace after JSON value.", token);
+ return false;
+ }
+ if (collectComments_ && !commentsBefore_.empty())
+ root.setComment(commentsBefore_, commentAfter);
+ if (features_.strictRoot_) {
+ if (!root.isArray() && !root.isObject()) {
+ // Set error location to start of doc, ideally should be first token found
+ // in doc
+ token.type_ = tokenError;
+ token.start_ = beginDoc;
+ token.end_ = endDoc;
+ addError(
+ "A valid JSON document must be either an array or an object value.",
+ token);
+ return false;
+ }
+ }
+ return successful;
+}
+
+bool OurReader::readValue() {
+ // To preserve the old behaviour we cast size_t to int.
+ if (nodes_.size() > features_.stackLimit_)
+ throwRuntimeError("Exceeded stackLimit in readValue().");
+ Token token;
+ skipCommentTokens(token);
+ bool successful = true;
+
+ if (collectComments_ && !commentsBefore_.empty()) {
+ currentValue().setComment(commentsBefore_, commentBefore);
+ commentsBefore_.clear();
+ }
+
+ switch (token.type_) {
+ case tokenObjectBegin:
+ successful = readObject(token);
+ currentValue().setOffsetLimit(current_ - begin_);
+ break;
+ case tokenArrayBegin:
+ successful = readArray(token);
+ currentValue().setOffsetLimit(current_ - begin_);
+ break;
+ case tokenNumber:
+ successful = decodeNumber(token);
+ break;
+ case tokenString:
+ successful = decodeString(token);
+ break;
+ case tokenTrue: {
+ Value v(true);
+ currentValue().swapPayload(v);
+ currentValue().setOffsetStart(token.start_ - begin_);
+ currentValue().setOffsetLimit(token.end_ - begin_);
+ } break;
+ case tokenFalse: {
+ Value v(false);
+ currentValue().swapPayload(v);
+ currentValue().setOffsetStart(token.start_ - begin_);
+ currentValue().setOffsetLimit(token.end_ - begin_);
+ } break;
+ case tokenNull: {
+ Value v;
+ currentValue().swapPayload(v);
+ currentValue().setOffsetStart(token.start_ - begin_);
+ currentValue().setOffsetLimit(token.end_ - begin_);
+ } break;
+ case tokenNaN: {
+ Value v(std::numeric_limits<double>::quiet_NaN());
+ currentValue().swapPayload(v);
+ currentValue().setOffsetStart(token.start_ - begin_);
+ currentValue().setOffsetLimit(token.end_ - begin_);
+ } break;
+ case tokenPosInf: {
+ Value v(std::numeric_limits<double>::infinity());
+ currentValue().swapPayload(v);
+ currentValue().setOffsetStart(token.start_ - begin_);
+ currentValue().setOffsetLimit(token.end_ - begin_);
+ } break;
+ case tokenNegInf: {
+ Value v(-std::numeric_limits<double>::infinity());
+ currentValue().swapPayload(v);
+ currentValue().setOffsetStart(token.start_ - begin_);
+ currentValue().setOffsetLimit(token.end_ - begin_);
+ } break;
+ case tokenArraySeparator:
+ case tokenObjectEnd:
+ case tokenArrayEnd:
+ if (features_.allowDroppedNullPlaceholders_) {
+ // "Un-read" the current token and mark the current value as a null
+ // token.
+ current_--;
+ Value v;
+ currentValue().swapPayload(v);
+ currentValue().setOffsetStart(current_ - begin_ - 1);
+ currentValue().setOffsetLimit(current_ - begin_);
+ break;
+ } // else, fall through ...
+ default:
+ currentValue().setOffsetStart(token.start_ - begin_);
+ currentValue().setOffsetLimit(token.end_ - begin_);
+ return addError("Syntax error: value, object or array expected.", token);
+ }
+
+ if (collectComments_) {
+ lastValueEnd_ = current_;
+ lastValueHasAComment_ = false;
+ lastValue_ = &currentValue();
+ }
+
+ return successful;
+}
+
+void OurReader::skipCommentTokens(Token& token) {
+ if (features_.allowComments_) {
+ do {
+ readToken(token);
+ } while (token.type_ == tokenComment);
+ } else {
+ readToken(token);
+ }
+}
+
+bool OurReader::readToken(Token& token) {
+ skipSpaces();
+ token.start_ = current_;
+ Char c = getNextChar();
+ bool ok = true;
+ switch (c) {
+ case '{':
+ token.type_ = tokenObjectBegin;
+ break;
+ case '}':
+ token.type_ = tokenObjectEnd;
+ break;
+ case '[':
+ token.type_ = tokenArrayBegin;
+ break;
+ case ']':
+ token.type_ = tokenArrayEnd;
+ break;
+ case '"':
+ token.type_ = tokenString;
+ ok = readString();
+ break;
+ case '\'':
+ if (features_.allowSingleQuotes_) {
+ token.type_ = tokenString;
+ ok = readStringSingleQuote();
+ } else {
+ // If we don't allow single quotes, this is a failure case.
+ ok = false;
+ }
+ break;
+ case '/':
+ token.type_ = tokenComment;
+ ok = readComment();
+ break;
+ case '0':
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7':
+ case '8':
+ case '9':
+ token.type_ = tokenNumber;
+ readNumber(false);
+ break;
+ case '-':
+ if (readNumber(true)) {
+ token.type_ = tokenNumber;
+ } else {
+ token.type_ = tokenNegInf;
+ ok = features_.allowSpecialFloats_ && match("nfinity", 7);
+ }
+ break;
+ case '+':
+ if (readNumber(true)) {
+ token.type_ = tokenNumber;
+ } else {
+ token.type_ = tokenPosInf;
+ ok = features_.allowSpecialFloats_ && match("nfinity", 7);
+ }
+ break;
+ case 't':
+ token.type_ = tokenTrue;
+ ok = match("rue", 3);
+ break;
+ case 'f':
+ token.type_ = tokenFalse;
+ ok = match("alse", 4);
+ break;
+ case 'n':
+ token.type_ = tokenNull;
+ ok = match("ull", 3);
+ break;
+ case 'N':
+ if (features_.allowSpecialFloats_) {
+ token.type_ = tokenNaN;
+ ok = match("aN", 2);
+ } else {
+ ok = false;
+ }
+ break;
+ case 'I':
+ if (features_.allowSpecialFloats_) {
+ token.type_ = tokenPosInf;
+ ok = match("nfinity", 7);
+ } else {
+ ok = false;
+ }
+ break;
+ case ',':
+ token.type_ = tokenArraySeparator;
+ break;
+ case ':':
+ token.type_ = tokenMemberSeparator;
+ break;
+ case 0:
+ token.type_ = tokenEndOfStream;
+ break;
+ default:
+ ok = false;
+ break;
+ }
+ if (!ok)
+ token.type_ = tokenError;
+ token.end_ = current_;
+ return ok;
+}
+
+void OurReader::skipSpaces() {
+ while (current_ != end_) {
+ Char c = *current_;
+ if (c == ' ' || c == '\t' || c == '\r' || c == '\n')
+ ++current_;
+ else
+ break;
+ }
+}
+
+void OurReader::skipBom(bool skipBom) {
+ // The default behavior is to skip BOM.
+ if (skipBom) {
+ if ((end_ - begin_) >= 3 && strncmp(begin_, "\xEF\xBB\xBF", 3) == 0) {
+ begin_ += 3;
+ current_ = begin_;
+ }
+ }
+}
+
+bool OurReader::match(const Char* pattern, int patternLength) {
+ if (end_ - current_ < patternLength)
+ return false;
+ int index = patternLength;
+ while (index--)
+ if (current_[index] != pattern[index])
+ return false;
+ current_ += patternLength;
+ return true;
+}
+
+bool OurReader::readComment() {
+ const Location commentBegin = current_ - 1;
+ const Char c = getNextChar();
+ bool successful = false;
+ bool cStyleWithEmbeddedNewline = false;
+
+ const bool isCStyleComment = (c == '*');
+ const bool isCppStyleComment = (c == '/');
+ if (isCStyleComment) {
+ successful = readCStyleComment(&cStyleWithEmbeddedNewline);
+ } else if (isCppStyleComment) {
+ successful = readCppStyleComment();
+ }
+
+ if (!successful)
+ return false;
+
+ if (collectComments_) {
+ CommentPlacement placement = commentBefore;
+
+ if (!lastValueHasAComment_) {
+ if (lastValueEnd_ && !containsNewLine(lastValueEnd_, commentBegin)) {
+ if (isCppStyleComment || !cStyleWithEmbeddedNewline) {
+ placement = commentAfterOnSameLine;
+ lastValueHasAComment_ = true;
+ }
+ }
+ }
+
+ addComment(commentBegin, current_, placement);
+ }
+ return true;
+}
+
+String OurReader::normalizeEOL(OurReader::Location begin,
+ OurReader::Location end) {
+ String normalized;
+ normalized.reserve(static_cast<size_t>(end - begin));
+ OurReader::Location current = begin;
+ while (current != end) {
+ char c = *current++;
+ if (c == '\r') {
+ if (current != end && *current == '\n')
+ // convert dos EOL
+ ++current;
+ // convert Mac EOL
+ normalized += '\n';
+ } else {
+ normalized += c;
+ }
+ }
+ return normalized;
+}
+
+void OurReader::addComment(Location begin, Location end,
+ CommentPlacement placement) {
+ assert(collectComments_);
+ const String& normalized = normalizeEOL(begin, end);
+ if (placement == commentAfterOnSameLine) {
+ assert(lastValue_ != nullptr);
+ lastValue_->setComment(normalized, placement);
+ } else {
+ commentsBefore_ += normalized;
+ }
+}
+
+bool OurReader::readCStyleComment(bool* containsNewLineResult) {
+ *containsNewLineResult = false;
+
+ while ((current_ + 1) < end_) {
+ Char c = getNextChar();
+ if (c == '*' && *current_ == '/')
+ break;
+ if (c == '\n')
+ *containsNewLineResult = true;
+ }
+
+ return getNextChar() == '/';
+}
+
+bool OurReader::readCppStyleComment() {
+ while (current_ != end_) {
+ Char c = getNextChar();
+ if (c == '\n')
+ break;
+ if (c == '\r') {
+ // Consume DOS EOL. It will be normalized in addComment.
+ if (current_ != end_ && *current_ == '\n')
+ getNextChar();
+ // Break on Moc OS 9 EOL.
+ break;
+ }
+ }
+ return true;
+}
+
+bool OurReader::readNumber(bool checkInf) {
+ Location p = current_;
+ if (checkInf && p != end_ && *p == 'I') {
+ current_ = ++p;
+ return false;
+ }
+ char c = '0'; // stopgap for already consumed character
+ // integral part
+ while (c >= '0' && c <= '9')
+ c = (current_ = p) < end_ ? *p++ : '\0';
+ // fractional part
+ if (c == '.') {
+ c = (current_ = p) < end_ ? *p++ : '\0';
+ while (c >= '0' && c <= '9')
+ c = (current_ = p) < end_ ? *p++ : '\0';
+ }
+ // exponential part
+ if (c == 'e' || c == 'E') {
+ c = (current_ = p) < end_ ? *p++ : '\0';
+ if (c == '+' || c == '-')
+ c = (current_ = p) < end_ ? *p++ : '\0';
+ while (c >= '0' && c <= '9')
+ c = (current_ = p) < end_ ? *p++ : '\0';
+ }
+ return true;
+}
+bool OurReader::readString() {
+ Char c = 0;
+ while (current_ != end_) {
+ c = getNextChar();
+ if (c == '\\')
+ getNextChar();
+ else if (c == '"')
+ break;
+ }
+ return c == '"';
+}
+
+bool OurReader::readStringSingleQuote() {
+ Char c = 0;
+ while (current_ != end_) {
+ c = getNextChar();
+ if (c == '\\')
+ getNextChar();
+ else if (c == '\'')
+ break;
+ }
+ return c == '\'';
+}
+
+bool OurReader::readObject(Token& token) {
+ Token tokenName;
+ String name;
+ Value init(objectValue);
+ currentValue().swapPayload(init);
+ currentValue().setOffsetStart(token.start_ - begin_);
+ while (readToken(tokenName)) {
+ bool initialTokenOk = true;
+ while (tokenName.type_ == tokenComment && initialTokenOk)
+ initialTokenOk = readToken(tokenName);
+ if (!initialTokenOk)
+ break;
+ if (tokenName.type_ == tokenObjectEnd &&
+ (name.empty() ||
+ features_.allowTrailingCommas_)) // empty object or trailing comma
+ return true;
+ name.clear();
+ if (tokenName.type_ == tokenString) {
+ if (!decodeString(tokenName, name))
+ return recoverFromError(tokenObjectEnd);
+ } else if (tokenName.type_ == tokenNumber && features_.allowNumericKeys_) {
+ Value numberName;
+ if (!decodeNumber(tokenName, numberName))
+ return recoverFromError(tokenObjectEnd);
+ name = numberName.asString();
+ } else {
+ break;
+ }
+ if (name.length() >= (1U << 30))
+ throwRuntimeError("keylength >= 2^30");
+ if (features_.rejectDupKeys_ && currentValue().isMember(name)) {
+ String msg = "Duplicate key: '" + name + "'";
+ return addErrorAndRecover(msg, tokenName, tokenObjectEnd);
+ }
+
+ Token colon;
+ if (!readToken(colon) || colon.type_ != tokenMemberSeparator) {
+ return addErrorAndRecover("Missing ':' after object member name", colon,
+ tokenObjectEnd);
+ }
+ Value& value = currentValue()[name];
+ nodes_.push(&value);
+ bool ok = readValue();
+ nodes_.pop();
+ if (!ok) // error already set
+ return recoverFromError(tokenObjectEnd);
+
+ Token comma;
+ if (!readToken(comma) ||
+ (comma.type_ != tokenObjectEnd && comma.type_ != tokenArraySeparator &&
+ comma.type_ != tokenComment)) {
+ return addErrorAndRecover("Missing ',' or '}' in object declaration",
+ comma, tokenObjectEnd);
+ }
+ bool finalizeTokenOk = true;
+ while (comma.type_ == tokenComment && finalizeTokenOk)
+ finalizeTokenOk = readToken(comma);
+ if (comma.type_ == tokenObjectEnd)
+ return true;
+ }
+ return addErrorAndRecover("Missing '}' or object member name", tokenName,
+ tokenObjectEnd);
+}
+
+bool OurReader::readArray(Token& token) {
+ Value init(arrayValue);
+ currentValue().swapPayload(init);
+ currentValue().setOffsetStart(token.start_ - begin_);
+ int index = 0;
+ for (;;) {
+ skipSpaces();
+ if (current_ != end_ && *current_ == ']' &&
+ (index == 0 ||
+ (features_.allowTrailingCommas_ &&
+ !features_.allowDroppedNullPlaceholders_))) // empty array or trailing
+ // comma
+ {
+ Token endArray;
+ readToken(endArray);
+ return true;
+ }
+ Value& value = currentValue()[index++];
+ nodes_.push(&value);
+ bool ok = readValue();
+ nodes_.pop();
+ if (!ok) // error already set
+ return recoverFromError(tokenArrayEnd);
+
+ Token currentToken;
+ // Accept Comment after last item in the array.
+ ok = readToken(currentToken);
+ while (currentToken.type_ == tokenComment && ok) {
+ ok = readToken(currentToken);
+ }
+ bool badTokenType = (currentToken.type_ != tokenArraySeparator &&
+ currentToken.type_ != tokenArrayEnd);
+ if (!ok || badTokenType) {
+ return addErrorAndRecover("Missing ',' or ']' in array declaration",
+ currentToken, tokenArrayEnd);
+ }
+ if (currentToken.type_ == tokenArrayEnd)
+ break;
+ }
+ return true;
+}
+
+bool OurReader::decodeNumber(Token& token) {
+ Value decoded;
+ if (!decodeNumber(token, decoded))
+ return false;
+ currentValue().swapPayload(decoded);
+ currentValue().setOffsetStart(token.start_ - begin_);
+ currentValue().setOffsetLimit(token.end_ - begin_);
+ return true;
+}
+
+bool OurReader::decodeNumber(Token& token, Value& decoded) {
+ // Attempts to parse the number as an integer. If the number is
+ // larger than the maximum supported value of an integer then
+ // we decode the number as a double.
+ Location current = token.start_;
+ const bool isNegative = *current == '-';
+ if (isNegative) {
+ ++current;
+ }
+
+ // We assume we can represent the largest and smallest integer types as
+ // unsigned integers with separate sign. This is only true if they can fit
+ // into an unsigned integer.
+ static_assert(Value::maxLargestInt <= Value::maxLargestUInt,
+ "Int must be smaller than UInt");
+
+ // We need to convert minLargestInt into a positive number. The easiest way
+ // to do this conversion is to assume our "threshold" value of minLargestInt
+ // divided by 10 can fit in maxLargestInt when absolute valued. This should
+ // be a safe assumption.
+ static_assert(Value::minLargestInt <= -Value::maxLargestInt,
+ "The absolute value of minLargestInt must be greater than or "
+ "equal to maxLargestInt");
+ static_assert(Value::minLargestInt / 10 >= -Value::maxLargestInt,
+ "The absolute value of minLargestInt must be only 1 magnitude "
+ "larger than maxLargest Int");
+
+ static constexpr Value::LargestUInt positive_threshold =
+ Value::maxLargestUInt / 10;
+ static constexpr Value::UInt positive_last_digit = Value::maxLargestUInt % 10;
+
+ // For the negative values, we have to be more careful. Since typically
+ // -Value::minLargestInt will cause an overflow, we first divide by 10 and
+ // then take the inverse. This assumes that minLargestInt is only a single
+ // power of 10 different in magnitude, which we check above. For the last
+ // digit, we take the modulus before negating for the same reason.
+ static constexpr auto negative_threshold =
+ Value::LargestUInt(-(Value::minLargestInt / 10));
+ static constexpr auto negative_last_digit =
+ Value::UInt(-(Value::minLargestInt % 10));
+
+ const Value::LargestUInt threshold =
+ isNegative ? negative_threshold : positive_threshold;
+ const Value::UInt max_last_digit =
+ isNegative ? negative_last_digit : positive_last_digit;
+
+ Value::LargestUInt value = 0;
+ while (current < token.end_) {
+ Char c = *current++;
+ if (c < '0' || c > '9')
+ return decodeDouble(token, decoded);
+
+ const auto digit(static_cast<Value::UInt>(c - '0'));
+ if (value >= threshold) {
+ // We've hit or exceeded the max value divided by 10 (rounded down). If
+ // a) we've only just touched the limit, meaning value == threshold,
+ // b) this is the last digit, or
+ // c) it's small enough to fit in that rounding delta, we're okay.
+ // Otherwise treat this number as a double to avoid overflow.
+ if (value > threshold || current != token.end_ ||
+ digit > max_last_digit) {
+ return decodeDouble(token, decoded);
+ }
+ }
+ value = value * 10 + digit;
+ }
+
+ if (isNegative) {
+ // We use the same magnitude assumption here, just in case.
+ const auto last_digit = static_cast<Value::UInt>(value % 10);
+ decoded = -Value::LargestInt(value / 10) * 10 - last_digit;
+ } else if (value <= Value::LargestUInt(Value::maxLargestInt)) {
+ decoded = Value::LargestInt(value);
+ } else {
+ decoded = value;
+ }
+
+ return true;
+}
+
+bool OurReader::decodeDouble(Token& token) {
+ Value decoded;
+ if (!decodeDouble(token, decoded))
+ return false;
+ currentValue().swapPayload(decoded);
+ currentValue().setOffsetStart(token.start_ - begin_);
+ currentValue().setOffsetLimit(token.end_ - begin_);
+ return true;
+}
+
+bool OurReader::decodeDouble(Token& token, Value& decoded) {
+ double value = 0;
+ const String buffer(token.start_, token.end_);
+ IStringStream is(buffer);
+ if (!(is >> value)) {
+ if (value == std::numeric_limits<double>::max())
+ value = std::numeric_limits<double>::infinity();
+ else if (value == std::numeric_limits<double>::lowest())
+ value = -std::numeric_limits<double>::infinity();
+ else if (!std::isinf(value))
+ return addError(
+ "'" + String(token.start_, token.end_) + "' is not a number.", token);
+ }
+ decoded = value;
+ return true;
+}
+
+bool OurReader::decodeString(Token& token) {
+ String decoded_string;
+ if (!decodeString(token, decoded_string))
+ return false;
+ Value decoded(decoded_string);
+ currentValue().swapPayload(decoded);
+ currentValue().setOffsetStart(token.start_ - begin_);
+ currentValue().setOffsetLimit(token.end_ - begin_);
+ return true;
+}
+
+bool OurReader::decodeString(Token& token, String& decoded) {
+ decoded.reserve(static_cast<size_t>(token.end_ - token.start_ - 2));
+ Location current = token.start_ + 1; // skip '"'
+ Location end = token.end_ - 1; // do not include '"'
+ while (current != end) {
+ Char c = *current++;
+ if (c == '"')
+ break;
+ if (c == '\\') {
+ if (current == end)
+ return addError("Empty escape sequence in string", token, current);
+ Char escape = *current++;
+ switch (escape) {
+ case '"':
+ decoded += '"';
+ break;
+ case '/':
+ decoded += '/';
+ break;
+ case '\\':
+ decoded += '\\';
+ break;
+ case 'b':
+ decoded += '\b';
+ break;
+ case 'f':
+ decoded += '\f';
+ break;
+ case 'n':
+ decoded += '\n';
+ break;
+ case 'r':
+ decoded += '\r';
+ break;
+ case 't':
+ decoded += '\t';
+ break;
+ case 'u': {
+ unsigned int unicode;
+ if (!decodeUnicodeCodePoint(token, current, end, unicode))
+ return false;
+ decoded += codePointToUTF8(unicode);
+ } break;
+ default:
+ return addError("Bad escape sequence in string", token, current);
+ }
+ } else {
+ decoded += c;
+ }
+ }
+ return true;
+}
+
+bool OurReader::decodeUnicodeCodePoint(Token& token, Location& current,
+ Location end, unsigned int& unicode) {
+
+ unicode = 0; // Convince clang-analyzer that this is initialized before use.
+ if (!decodeUnicodeEscapeSequence(token, current, end, unicode))
+ return false;
+ if (unicode >= 0xD800 && unicode <= 0xDBFF) {
+ // surrogate pairs
+ if (end - current < 6)
+ return addError(
+ "additional six characters expected to parse unicode surrogate pair.",
+ token, current);
+ if (*(current++) == '\\' && *(current++) == 'u') {
+ unsigned int surrogatePair;
+ if (decodeUnicodeEscapeSequence(token, current, end, surrogatePair)) {
+ unicode = 0x10000 + ((unicode & 0x3FF) << 10) + (surrogatePair & 0x3FF);
+ } else
+ return false;
+ } else
+ return addError("expecting another \\u token to begin the second half of "
+ "a unicode surrogate pair",
+ token, current);
+ }
+ return true;
+}
+
+bool OurReader::decodeUnicodeEscapeSequence(Token& token, Location& current,
+ Location end,
+ unsigned int& ret_unicode) {
+ if (end - current < 4)
+ return addError(
+ "Bad unicode escape sequence in string: four digits expected.", token,
+ current);
+ int unicode = 0;
+ for (int index = 0; index < 4; ++index) {
+ Char c = *current++;
+ unicode *= 16;
+ if (c >= '0' && c <= '9')
+ unicode += c - '0';
+ else if (c >= 'a' && c <= 'f')
+ unicode += c - 'a' + 10;
+ else if (c >= 'A' && c <= 'F')
+ unicode += c - 'A' + 10;
+ else
+ return addError(
+ "Bad unicode escape sequence in string: hexadecimal digit expected.",
+ token, current);
+ }
+ ret_unicode = static_cast<unsigned int>(unicode);
+ return true;
+}
+
+bool OurReader::addError(const String& message, Token& token, Location extra) {
+ ErrorInfo info;
+ info.token_ = token;
+ info.message_ = message;
+ info.extra_ = extra;
+ errors_.push_back(info);
+ return false;
+}
+
+bool OurReader::recoverFromError(TokenType skipUntilToken) {
+ size_t errorCount = errors_.size();
+ Token skip;
+ for (;;) {
+ if (!readToken(skip))
+ errors_.resize(errorCount); // discard errors caused by recovery
+ if (skip.type_ == skipUntilToken || skip.type_ == tokenEndOfStream)
+ break;
+ }
+ errors_.resize(errorCount);
+ return false;
+}
+
+bool OurReader::addErrorAndRecover(const String& message, Token& token,
+ TokenType skipUntilToken) {
+ addError(message, token);
+ return recoverFromError(skipUntilToken);
+}
+
+Value& OurReader::currentValue() { return *(nodes_.top()); }
+
+OurReader::Char OurReader::getNextChar() {
+ if (current_ == end_)
+ return 0;
+ return *current_++;
+}
+
+void OurReader::getLocationLineAndColumn(Location location, int& line,
+ int& column) const {
+ Location current = begin_;
+ Location lastLineStart = current;
+ line = 0;
+ while (current < location && current != end_) {
+ Char c = *current++;
+ if (c == '\r') {
+ if (*current == '\n')
+ ++current;
+ lastLineStart = current;
+ ++line;
+ } else if (c == '\n') {
+ lastLineStart = current;
+ ++line;
+ }
+ }
+ // column & line start at 1
+ column = int(location - lastLineStart) + 1;
+ ++line;
+}
+
+String OurReader::getLocationLineAndColumn(Location location) const {
+ int line, column;
+ getLocationLineAndColumn(location, line, column);
+ char buffer[18 + 16 + 16 + 1];
+ jsoncpp_snprintf(buffer, sizeof(buffer), "Line %d, Column %d", line, column);
+ return buffer;
+}
+
+String OurReader::getFormattedErrorMessages() const {
+ String formattedMessage;
+ for (const auto& error : errors_) {
+ formattedMessage +=
+ "* " + getLocationLineAndColumn(error.token_.start_) + "\n";
+ formattedMessage += " " + error.message_ + "\n";
+ if (error.extra_)
+ formattedMessage +=
+ "See " + getLocationLineAndColumn(error.extra_) + " for detail.\n";
+ }
+ return formattedMessage;
+}
+
+std::vector<OurReader::StructuredError> OurReader::getStructuredErrors() const {
+ std::vector<OurReader::StructuredError> allErrors;
+ for (const auto& error : errors_) {
+ OurReader::StructuredError structured;
+ structured.offset_start = error.token_.start_ - begin_;
+ structured.offset_limit = error.token_.end_ - begin_;
+ structured.message = error.message_;
+ allErrors.push_back(structured);
+ }
+ return allErrors;
+}
+
+class OurCharReader : public CharReader {
+ bool const collectComments_;
+ OurReader reader_;
+
+public:
+ OurCharReader(bool collectComments, OurFeatures const& features)
+ : collectComments_(collectComments), reader_(features) {}
+ bool parse(char const* beginDoc, char const* endDoc, Value* root,
+ String* errs) override {
+ bool ok = reader_.parse(beginDoc, endDoc, *root, collectComments_);
+ if (errs) {
+ *errs = reader_.getFormattedErrorMessages();
+ }
+ return ok;
+ }
+};
+
+CharReaderBuilder::CharReaderBuilder() { setDefaults(&settings_); }
+CharReaderBuilder::~CharReaderBuilder() = default;
+CharReader* CharReaderBuilder::newCharReader() const {
+ bool collectComments = settings_["collectComments"].asBool();
+ OurFeatures features = OurFeatures::all();
+ features.allowComments_ = settings_["allowComments"].asBool();
+ features.allowTrailingCommas_ = settings_["allowTrailingCommas"].asBool();
+ features.strictRoot_ = settings_["strictRoot"].asBool();
+ features.allowDroppedNullPlaceholders_ =
+ settings_["allowDroppedNullPlaceholders"].asBool();
+ features.allowNumericKeys_ = settings_["allowNumericKeys"].asBool();
+ features.allowSingleQuotes_ = settings_["allowSingleQuotes"].asBool();
+
+ // Stack limit is always a size_t, so we get this as an unsigned int
+ // regardless of it we have 64-bit integer support enabled.
+ features.stackLimit_ = static_cast<size_t>(settings_["stackLimit"].asUInt());
+ features.failIfExtra_ = settings_["failIfExtra"].asBool();
+ features.rejectDupKeys_ = settings_["rejectDupKeys"].asBool();
+ features.allowSpecialFloats_ = settings_["allowSpecialFloats"].asBool();
+ features.skipBom_ = settings_["skipBom"].asBool();
+ return new OurCharReader(collectComments, features);
+}
+
+bool CharReaderBuilder::validate(Json::Value* invalid) const {
+ static const auto& valid_keys = *new std::set<String>{
+ "collectComments",
+ "allowComments",
+ "allowTrailingCommas",
+ "strictRoot",
+ "allowDroppedNullPlaceholders",
+ "allowNumericKeys",
+ "allowSingleQuotes",
+ "stackLimit",
+ "failIfExtra",
+ "rejectDupKeys",
+ "allowSpecialFloats",
+ "skipBom",
+ };
+ for (auto si = settings_.begin(); si != settings_.end(); ++si) {
+ auto key = si.name();
+ if (valid_keys.count(key))
+ continue;
+ if (invalid)
+ (*invalid)[key] = *si;
+ else
+ return false;
+ }
+ return invalid ? invalid->empty() : true;
+}
+
+Value& CharReaderBuilder::operator[](const String& key) {
+ return settings_[key];
+}
+// static
+void CharReaderBuilder::strictMode(Json::Value* settings) {
+ //! [CharReaderBuilderStrictMode]
+ (*settings)["allowComments"] = false;
+ (*settings)["allowTrailingCommas"] = false;
+ (*settings)["strictRoot"] = true;
+ (*settings)["allowDroppedNullPlaceholders"] = false;
+ (*settings)["allowNumericKeys"] = false;
+ (*settings)["allowSingleQuotes"] = false;
+ (*settings)["stackLimit"] = 1000;
+ (*settings)["failIfExtra"] = true;
+ (*settings)["rejectDupKeys"] = true;
+ (*settings)["allowSpecialFloats"] = false;
+ (*settings)["skipBom"] = true;
+ //! [CharReaderBuilderStrictMode]
+}
+// static
+void CharReaderBuilder::setDefaults(Json::Value* settings) {
+ //! [CharReaderBuilderDefaults]
+ (*settings)["collectComments"] = true;
+ (*settings)["allowComments"] = true;
+ (*settings)["allowTrailingCommas"] = true;
+ (*settings)["strictRoot"] = false;
+ (*settings)["allowDroppedNullPlaceholders"] = false;
+ (*settings)["allowNumericKeys"] = false;
+ (*settings)["allowSingleQuotes"] = false;
+ (*settings)["stackLimit"] = 1000;
+ (*settings)["failIfExtra"] = false;
+ (*settings)["rejectDupKeys"] = false;
+ (*settings)["allowSpecialFloats"] = false;
+ (*settings)["skipBom"] = true;
+ //! [CharReaderBuilderDefaults]
+}
+
+//////////////////////////////////
+// global functions
+
+bool parseFromStream(CharReader::Factory const& fact, IStream& sin, Value* root,
+ String* errs) {
+ OStringStream ssin;
+ ssin << sin.rdbuf();
+ String doc = ssin.str();
+ char const* begin = doc.data();
+ char const* end = begin + doc.size();
+ // Note that we do not actually need a null-terminator.
+ CharReaderPtr const reader(fact.newCharReader());
+ return reader->parse(begin, end, root, errs);
+}
+
+IStream& operator>>(IStream& sin, Value& root) {
+ CharReaderBuilder b;
+ String errs;
+ bool ok = parseFromStream(b, sin, &root, &errs);
+ if (!ok) {
+ throwRuntimeError(errs);
+ }
+ return sin;
+}
+
+} // namespace Json
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