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Diffstat (limited to 'toolkit/components/jsoncpp/src/lib_json/json_writer.cpp')
| -rw-r--r-- | toolkit/components/jsoncpp/src/lib_json/json_writer.cpp | 1259 |
1 files changed, 1259 insertions, 0 deletions
diff --git a/toolkit/components/jsoncpp/src/lib_json/json_writer.cpp b/toolkit/components/jsoncpp/src/lib_json/json_writer.cpp new file mode 100644 index 0000000000..0dd160e452 --- /dev/null +++ b/toolkit/components/jsoncpp/src/lib_json/json_writer.cpp @@ -0,0 +1,1259 @@ +// Copyright 2011 Baptiste Lepilleur and The JsonCpp Authors +// 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/writer.h> +#endif // if !defined(JSON_IS_AMALGAMATION) +#include <algorithm> +#include <cassert> +#include <cctype> +#include <cstring> +#include <iomanip> +#include <memory> +#include <set> +#include <sstream> +#include <utility> + +#if __cplusplus >= 201103L +#include <cmath> +#include <cstdio> + +#if !defined(isnan) +#define isnan std::isnan +#endif + +#if !defined(isfinite) +#define isfinite std::isfinite +#endif + +#else +#include <cmath> +#include <cstdio> + +#if defined(_MSC_VER) +#if !defined(isnan) +#include <float.h> +#define isnan _isnan +#endif + +#if !defined(isfinite) +#include <float.h> +#define isfinite _finite +#endif + +#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(__sun) && defined(__SVR4) // Solaris +#if !defined(isfinite) +#include <ieeefp.h> +#define isfinite finite +#endif +#endif + +#if defined(__hpux) +#if !defined(isfinite) +#if defined(__ia64) && !defined(finite) +#define isfinite(x) \ + ((sizeof(x) == sizeof(float) ? _Isfinitef(x) : _IsFinite(x))) +#endif +#endif +#endif + +#if !defined(isnan) +// IEEE standard states that NaN values will not compare to themselves +#define isnan(x) ((x) != (x)) +#endif + +#if !defined(__APPLE__) +#if !defined(isfinite) +#define isfinite finite +#endif +#endif +#endif + +#if defined(_MSC_VER) +// Disable warning about strdup being deprecated. +#pragma warning(disable : 4996) +#endif + +namespace Json { + +#if __cplusplus >= 201103L || (defined(_CPPLIB_VER) && _CPPLIB_VER >= 520) +using StreamWriterPtr = std::unique_ptr<StreamWriter>; +#else +using StreamWriterPtr = std::auto_ptr<StreamWriter>; +#endif + +String valueToString(LargestInt value) { + UIntToStringBuffer buffer; + char* current = buffer + sizeof(buffer); + if (value == Value::minLargestInt) { + uintToString(LargestUInt(Value::maxLargestInt) + 1, current); + *--current = '-'; + } else if (value < 0) { + uintToString(LargestUInt(-value), current); + *--current = '-'; + } else { + uintToString(LargestUInt(value), current); + } + assert(current >= buffer); + return current; +} + +String valueToString(LargestUInt value) { + UIntToStringBuffer buffer; + char* current = buffer + sizeof(buffer); + uintToString(value, current); + assert(current >= buffer); + return current; +} + +#if defined(JSON_HAS_INT64) + +String valueToString(Int value) { return valueToString(LargestInt(value)); } + +String valueToString(UInt value) { return valueToString(LargestUInt(value)); } + +#endif // # if defined(JSON_HAS_INT64) + +namespace { +String valueToString(double value, bool useSpecialFloats, + unsigned int precision, PrecisionType precisionType) { + // Print into the buffer. We need not request the alternative representation + // that always has a decimal point because JSON doesn't distinguish the + // concepts of reals and integers. + if (!isfinite(value)) { + static const char* const reps[2][3] = {{"NaN", "-Infinity", "Infinity"}, + {"null", "-1e+9999", "1e+9999"}}; + return reps[useSpecialFloats ? 0 : 1] + [isnan(value) ? 0 : (value < 0) ? 1 : 2]; + } + + String buffer(size_t(36), '\0'); + while (true) { + int len = jsoncpp_snprintf( + &*buffer.begin(), buffer.size(), + (precisionType == PrecisionType::significantDigits) ? "%.*g" : "%.*f", + precision, value); + assert(len >= 0); + auto wouldPrint = static_cast<size_t>(len); + if (wouldPrint >= buffer.size()) { + buffer.resize(wouldPrint + 1); + continue; + } + buffer.resize(wouldPrint); + break; + } + + buffer.erase(fixNumericLocale(buffer.begin(), buffer.end()), buffer.end()); + + // try to ensure we preserve the fact that this was given to us as a double on + // input + if (buffer.find('.') == buffer.npos && buffer.find('e') == buffer.npos) { + buffer += ".0"; + } + + // strip the zero padding from the right + if (precisionType == PrecisionType::decimalPlaces) { + buffer.erase(fixZerosInTheEnd(buffer.begin(), buffer.end(), precision), + buffer.end()); + } + + return buffer; +} +} // namespace + +String valueToString(double value, unsigned int precision, + PrecisionType precisionType) { + return valueToString(value, false, precision, precisionType); +} + +String valueToString(bool value) { return value ? "true" : "false"; } + +static bool doesAnyCharRequireEscaping(char const* s, size_t n) { + assert(s || !n); + + return std::any_of(s, s + n, [](unsigned char c) { + return c == '\\' || c == '"' || c < 0x20 || c > 0x7F; + }); +} + +static unsigned int utf8ToCodepoint(const char*& s, const char* e) { + const unsigned int REPLACEMENT_CHARACTER = 0xFFFD; + + unsigned int firstByte = static_cast<unsigned char>(*s); + + if (firstByte < 0x80) + return firstByte; + + if (firstByte < 0xE0) { + if (e - s < 2) + return REPLACEMENT_CHARACTER; + + unsigned int calculated = + ((firstByte & 0x1F) << 6) | (static_cast<unsigned int>(s[1]) & 0x3F); + s += 1; + // oversized encoded characters are invalid + return calculated < 0x80 ? REPLACEMENT_CHARACTER : calculated; + } + + if (firstByte < 0xF0) { + if (e - s < 3) + return REPLACEMENT_CHARACTER; + + unsigned int calculated = ((firstByte & 0x0F) << 12) | + ((static_cast<unsigned int>(s[1]) & 0x3F) << 6) | + (static_cast<unsigned int>(s[2]) & 0x3F); + s += 2; + // surrogates aren't valid codepoints itself + // shouldn't be UTF-8 encoded + if (calculated >= 0xD800 && calculated <= 0xDFFF) + return REPLACEMENT_CHARACTER; + // oversized encoded characters are invalid + return calculated < 0x800 ? REPLACEMENT_CHARACTER : calculated; + } + + if (firstByte < 0xF8) { + if (e - s < 4) + return REPLACEMENT_CHARACTER; + + unsigned int calculated = ((firstByte & 0x07) << 18) | + ((static_cast<unsigned int>(s[1]) & 0x3F) << 12) | + ((static_cast<unsigned int>(s[2]) & 0x3F) << 6) | + (static_cast<unsigned int>(s[3]) & 0x3F); + s += 3; + // oversized encoded characters are invalid + return calculated < 0x10000 ? REPLACEMENT_CHARACTER : calculated; + } + + return REPLACEMENT_CHARACTER; +} + +static const char hex2[] = "000102030405060708090a0b0c0d0e0f" + "101112131415161718191a1b1c1d1e1f" + "202122232425262728292a2b2c2d2e2f" + "303132333435363738393a3b3c3d3e3f" + "404142434445464748494a4b4c4d4e4f" + "505152535455565758595a5b5c5d5e5f" + "606162636465666768696a6b6c6d6e6f" + "707172737475767778797a7b7c7d7e7f" + "808182838485868788898a8b8c8d8e8f" + "909192939495969798999a9b9c9d9e9f" + "a0a1a2a3a4a5a6a7a8a9aaabacadaeaf" + "b0b1b2b3b4b5b6b7b8b9babbbcbdbebf" + "c0c1c2c3c4c5c6c7c8c9cacbcccdcecf" + "d0d1d2d3d4d5d6d7d8d9dadbdcdddedf" + "e0e1e2e3e4e5e6e7e8e9eaebecedeeef" + "f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff"; + +static String toHex16Bit(unsigned int x) { + const unsigned int hi = (x >> 8) & 0xff; + const unsigned int lo = x & 0xff; + String result(4, ' '); + result[0] = hex2[2 * hi]; + result[1] = hex2[2 * hi + 1]; + result[2] = hex2[2 * lo]; + result[3] = hex2[2 * lo + 1]; + return result; +} + +static void appendRaw(String& result, unsigned ch) { + result += static_cast<char>(ch); +} + +static void appendHex(String& result, unsigned ch) { + result.append("\\u").append(toHex16Bit(ch)); +} + +static String valueToQuotedStringN(const char* value, size_t length, + bool emitUTF8 = false) { + if (value == nullptr) + return ""; + + if (!doesAnyCharRequireEscaping(value, length)) + return String("\"") + value + "\""; + // We have to walk value and escape any special characters. + // Appending to String is not efficient, but this should be rare. + // (Note: forward slashes are *not* rare, but I am not escaping them.) + String::size_type maxsize = length * 2 + 3; // allescaped+quotes+NULL + String result; + result.reserve(maxsize); // to avoid lots of mallocs + result += "\""; + char const* end = value + length; + for (const char* c = value; c != end; ++c) { + switch (*c) { + case '\"': + result += "\\\""; + break; + case '\\': + result += "\\\\"; + break; + case '\b': + result += "\\b"; + break; + case '\f': + result += "\\f"; + break; + case '\n': + result += "\\n"; + break; + case '\r': + result += "\\r"; + break; + case '\t': + result += "\\t"; + break; + // case '/': + // Even though \/ is considered a legal escape in JSON, a bare + // slash is also legal, so I see no reason to escape it. + // (I hope I am not misunderstanding something.) + // blep notes: actually escaping \/ may be useful in javascript to avoid </ + // sequence. + // Should add a flag to allow this compatibility mode and prevent this + // sequence from occurring. + default: { + if (emitUTF8) { + unsigned codepoint = static_cast<unsigned char>(*c); + if (codepoint < 0x20) { + appendHex(result, codepoint); + } else { + appendRaw(result, codepoint); + } + } else { + unsigned codepoint = utf8ToCodepoint(c, end); // modifies `c` + if (codepoint < 0x20) { + appendHex(result, codepoint); + } else if (codepoint < 0x80) { + appendRaw(result, codepoint); + } else if (codepoint < 0x10000) { + // Basic Multilingual Plane + appendHex(result, codepoint); + } else { + // Extended Unicode. Encode 20 bits as a surrogate pair. + codepoint -= 0x10000; + appendHex(result, 0xd800 + ((codepoint >> 10) & 0x3ff)); + appendHex(result, 0xdc00 + (codepoint & 0x3ff)); + } + } + } break; + } + } + result += "\""; + return result; +} + +String valueToQuotedString(const char* value) { + return valueToQuotedStringN(value, strlen(value)); +} + +// Class Writer +// ////////////////////////////////////////////////////////////////// +Writer::~Writer() = default; + +// Class FastWriter +// ////////////////////////////////////////////////////////////////// + +FastWriter::FastWriter() + + = default; + +void FastWriter::enableYAMLCompatibility() { yamlCompatibilityEnabled_ = true; } + +void FastWriter::dropNullPlaceholders() { dropNullPlaceholders_ = true; } + +void FastWriter::omitEndingLineFeed() { omitEndingLineFeed_ = true; } + +String FastWriter::write(const Value& root) { + document_.clear(); + writeValue(root); + if (!omitEndingLineFeed_) + document_ += '\n'; + return document_; +} + +void FastWriter::writeValue(const Value& value) { + switch (value.type()) { + case nullValue: + if (!dropNullPlaceholders_) + document_ += "null"; + break; + case intValue: + document_ += valueToString(value.asLargestInt()); + break; + case uintValue: + document_ += valueToString(value.asLargestUInt()); + break; + case realValue: + document_ += valueToString(value.asDouble()); + break; + case stringValue: { + // Is NULL possible for value.string_? No. + char const* str; + char const* end; + bool ok = value.getString(&str, &end); + if (ok) + document_ += valueToQuotedStringN(str, static_cast<size_t>(end - str)); + break; + } + case booleanValue: + document_ += valueToString(value.asBool()); + break; + case arrayValue: { + document_ += '['; + ArrayIndex size = value.size(); + for (ArrayIndex index = 0; index < size; ++index) { + if (index > 0) + document_ += ','; + writeValue(value[index]); + } + document_ += ']'; + } break; + case objectValue: { + Value::Members members(value.getMemberNames()); + document_ += '{'; + for (auto it = members.begin(); it != members.end(); ++it) { + const String& name = *it; + if (it != members.begin()) + document_ += ','; + document_ += valueToQuotedStringN(name.data(), name.length()); + document_ += yamlCompatibilityEnabled_ ? ": " : ":"; + writeValue(value[name]); + } + document_ += '}'; + } break; + } +} + +// Class StyledWriter +// ////////////////////////////////////////////////////////////////// + +StyledWriter::StyledWriter() = default; + +String StyledWriter::write(const Value& root) { + document_.clear(); + addChildValues_ = false; + indentString_.clear(); + writeCommentBeforeValue(root); + writeValue(root); + writeCommentAfterValueOnSameLine(root); + document_ += '\n'; + return document_; +} + +void StyledWriter::writeValue(const Value& value) { + switch (value.type()) { + case nullValue: + pushValue("null"); + break; + case intValue: + pushValue(valueToString(value.asLargestInt())); + break; + case uintValue: + pushValue(valueToString(value.asLargestUInt())); + break; + case realValue: + pushValue(valueToString(value.asDouble())); + break; + case stringValue: { + // Is NULL possible for value.string_? No. + char const* str; + char const* end; + bool ok = value.getString(&str, &end); + if (ok) + pushValue(valueToQuotedStringN(str, static_cast<size_t>(end - str))); + else + pushValue(""); + break; + } + case booleanValue: + pushValue(valueToString(value.asBool())); + break; + case arrayValue: + writeArrayValue(value); + break; + case objectValue: { + Value::Members members(value.getMemberNames()); + if (members.empty()) + pushValue("{}"); + else { + writeWithIndent("{"); + indent(); + auto it = members.begin(); + for (;;) { + const String& name = *it; + const Value& childValue = value[name]; + writeCommentBeforeValue(childValue); + writeWithIndent(valueToQuotedString(name.c_str())); + document_ += " : "; + writeValue(childValue); + if (++it == members.end()) { + writeCommentAfterValueOnSameLine(childValue); + break; + } + document_ += ','; + writeCommentAfterValueOnSameLine(childValue); + } + unindent(); + writeWithIndent("}"); + } + } break; + } +} + +void StyledWriter::writeArrayValue(const Value& value) { + size_t size = value.size(); + if (size == 0) + pushValue("[]"); + else { + bool isArrayMultiLine = isMultilineArray(value); + if (isArrayMultiLine) { + writeWithIndent("["); + indent(); + bool hasChildValue = !childValues_.empty(); + ArrayIndex index = 0; + for (;;) { + const Value& childValue = value[index]; + writeCommentBeforeValue(childValue); + if (hasChildValue) + writeWithIndent(childValues_[index]); + else { + writeIndent(); + writeValue(childValue); + } + if (++index == size) { + writeCommentAfterValueOnSameLine(childValue); + break; + } + document_ += ','; + writeCommentAfterValueOnSameLine(childValue); + } + unindent(); + writeWithIndent("]"); + } else // output on a single line + { + assert(childValues_.size() == size); + document_ += "[ "; + for (size_t index = 0; index < size; ++index) { + if (index > 0) + document_ += ", "; + document_ += childValues_[index]; + } + document_ += " ]"; + } + } +} + +bool StyledWriter::isMultilineArray(const Value& value) { + ArrayIndex const size = value.size(); + bool isMultiLine = size * 3 >= rightMargin_; + childValues_.clear(); + for (ArrayIndex index = 0; index < size && !isMultiLine; ++index) { + const Value& childValue = value[index]; + isMultiLine = ((childValue.isArray() || childValue.isObject()) && + !childValue.empty()); + } + if (!isMultiLine) // check if line length > max line length + { + childValues_.reserve(size); + addChildValues_ = true; + ArrayIndex lineLength = 4 + (size - 1) * 2; // '[ ' + ', '*n + ' ]' + for (ArrayIndex index = 0; index < size; ++index) { + if (hasCommentForValue(value[index])) { + isMultiLine = true; + } + writeValue(value[index]); + lineLength += static_cast<ArrayIndex>(childValues_[index].length()); + } + addChildValues_ = false; + isMultiLine = isMultiLine || lineLength >= rightMargin_; + } + return isMultiLine; +} + +void StyledWriter::pushValue(const String& value) { + if (addChildValues_) + childValues_.push_back(value); + else + document_ += value; +} + +void StyledWriter::writeIndent() { + if (!document_.empty()) { + char last = document_[document_.length() - 1]; + if (last == ' ') // already indented + return; + if (last != '\n') // Comments may add new-line + document_ += '\n'; + } + document_ += indentString_; +} + +void StyledWriter::writeWithIndent(const String& value) { + writeIndent(); + document_ += value; +} + +void StyledWriter::indent() { indentString_ += String(indentSize_, ' '); } + +void StyledWriter::unindent() { + assert(indentString_.size() >= indentSize_); + indentString_.resize(indentString_.size() - indentSize_); +} + +void StyledWriter::writeCommentBeforeValue(const Value& root) { + if (!root.hasComment(commentBefore)) + return; + + document_ += '\n'; + writeIndent(); + const String& comment = root.getComment(commentBefore); + String::const_iterator iter = comment.begin(); + while (iter != comment.end()) { + document_ += *iter; + if (*iter == '\n' && ((iter + 1) != comment.end() && *(iter + 1) == '/')) + writeIndent(); + ++iter; + } + + // Comments are stripped of trailing newlines, so add one here + document_ += '\n'; +} + +void StyledWriter::writeCommentAfterValueOnSameLine(const Value& root) { + if (root.hasComment(commentAfterOnSameLine)) + document_ += " " + root.getComment(commentAfterOnSameLine); + + if (root.hasComment(commentAfter)) { + document_ += '\n'; + document_ += root.getComment(commentAfter); + document_ += '\n'; + } +} + +bool StyledWriter::hasCommentForValue(const Value& value) { + return value.hasComment(commentBefore) || + value.hasComment(commentAfterOnSameLine) || + value.hasComment(commentAfter); +} + +// Class StyledStreamWriter +// ////////////////////////////////////////////////////////////////// + +StyledStreamWriter::StyledStreamWriter(String indentation) + : document_(nullptr), indentation_(std::move(indentation)), + addChildValues_(), indented_(false) {} + +void StyledStreamWriter::write(OStream& out, const Value& root) { + document_ = &out; + addChildValues_ = false; + indentString_.clear(); + indented_ = true; + writeCommentBeforeValue(root); + if (!indented_) + writeIndent(); + indented_ = true; + writeValue(root); + writeCommentAfterValueOnSameLine(root); + *document_ << "\n"; + document_ = nullptr; // Forget the stream, for safety. +} + +void StyledStreamWriter::writeValue(const Value& value) { + switch (value.type()) { + case nullValue: + pushValue("null"); + break; + case intValue: + pushValue(valueToString(value.asLargestInt())); + break; + case uintValue: + pushValue(valueToString(value.asLargestUInt())); + break; + case realValue: + pushValue(valueToString(value.asDouble())); + break; + case stringValue: { + // Is NULL possible for value.string_? No. + char const* str; + char const* end; + bool ok = value.getString(&str, &end); + if (ok) + pushValue(valueToQuotedStringN(str, static_cast<size_t>(end - str))); + else + pushValue(""); + break; + } + case booleanValue: + pushValue(valueToString(value.asBool())); + break; + case arrayValue: + writeArrayValue(value); + break; + case objectValue: { + Value::Members members(value.getMemberNames()); + if (members.empty()) + pushValue("{}"); + else { + writeWithIndent("{"); + indent(); + auto it = members.begin(); + for (;;) { + const String& name = *it; + const Value& childValue = value[name]; + writeCommentBeforeValue(childValue); + writeWithIndent(valueToQuotedString(name.c_str())); + *document_ << " : "; + writeValue(childValue); + if (++it == members.end()) { + writeCommentAfterValueOnSameLine(childValue); + break; + } + *document_ << ","; + writeCommentAfterValueOnSameLine(childValue); + } + unindent(); + writeWithIndent("}"); + } + } break; + } +} + +void StyledStreamWriter::writeArrayValue(const Value& value) { + unsigned size = value.size(); + if (size == 0) + pushValue("[]"); + else { + bool isArrayMultiLine = isMultilineArray(value); + if (isArrayMultiLine) { + writeWithIndent("["); + indent(); + bool hasChildValue = !childValues_.empty(); + unsigned index = 0; + for (;;) { + const Value& childValue = value[index]; + writeCommentBeforeValue(childValue); + if (hasChildValue) + writeWithIndent(childValues_[index]); + else { + if (!indented_) + writeIndent(); + indented_ = true; + writeValue(childValue); + indented_ = false; + } + if (++index == size) { + writeCommentAfterValueOnSameLine(childValue); + break; + } + *document_ << ","; + writeCommentAfterValueOnSameLine(childValue); + } + unindent(); + writeWithIndent("]"); + } else // output on a single line + { + assert(childValues_.size() == size); + *document_ << "[ "; + for (unsigned index = 0; index < size; ++index) { + if (index > 0) + *document_ << ", "; + *document_ << childValues_[index]; + } + *document_ << " ]"; + } + } +} + +bool StyledStreamWriter::isMultilineArray(const Value& value) { + ArrayIndex const size = value.size(); + bool isMultiLine = size * 3 >= rightMargin_; + childValues_.clear(); + for (ArrayIndex index = 0; index < size && !isMultiLine; ++index) { + const Value& childValue = value[index]; + isMultiLine = ((childValue.isArray() || childValue.isObject()) && + !childValue.empty()); + } + if (!isMultiLine) // check if line length > max line length + { + childValues_.reserve(size); + addChildValues_ = true; + ArrayIndex lineLength = 4 + (size - 1) * 2; // '[ ' + ', '*n + ' ]' + for (ArrayIndex index = 0; index < size; ++index) { + if (hasCommentForValue(value[index])) { + isMultiLine = true; + } + writeValue(value[index]); + lineLength += static_cast<ArrayIndex>(childValues_[index].length()); + } + addChildValues_ = false; + isMultiLine = isMultiLine || lineLength >= rightMargin_; + } + return isMultiLine; +} + +void StyledStreamWriter::pushValue(const String& value) { + if (addChildValues_) + childValues_.push_back(value); + else + *document_ << value; +} + +void StyledStreamWriter::writeIndent() { + // blep intended this to look at the so-far-written string + // to determine whether we are already indented, but + // with a stream we cannot do that. So we rely on some saved state. + // The caller checks indented_. + *document_ << '\n' << indentString_; +} + +void StyledStreamWriter::writeWithIndent(const String& value) { + if (!indented_) + writeIndent(); + *document_ << value; + indented_ = false; +} + +void StyledStreamWriter::indent() { indentString_ += indentation_; } + +void StyledStreamWriter::unindent() { + assert(indentString_.size() >= indentation_.size()); + indentString_.resize(indentString_.size() - indentation_.size()); +} + +void StyledStreamWriter::writeCommentBeforeValue(const Value& root) { + if (!root.hasComment(commentBefore)) + return; + + if (!indented_) + writeIndent(); + const String& comment = root.getComment(commentBefore); + String::const_iterator iter = comment.begin(); + while (iter != comment.end()) { + *document_ << *iter; + if (*iter == '\n' && ((iter + 1) != comment.end() && *(iter + 1) == '/')) + // writeIndent(); // would include newline + *document_ << indentString_; + ++iter; + } + indented_ = false; +} + +void StyledStreamWriter::writeCommentAfterValueOnSameLine(const Value& root) { + if (root.hasComment(commentAfterOnSameLine)) + *document_ << ' ' << root.getComment(commentAfterOnSameLine); + + if (root.hasComment(commentAfter)) { + writeIndent(); + *document_ << root.getComment(commentAfter); + } + indented_ = false; +} + +bool StyledStreamWriter::hasCommentForValue(const Value& value) { + return value.hasComment(commentBefore) || + value.hasComment(commentAfterOnSameLine) || + value.hasComment(commentAfter); +} + +////////////////////////// +// BuiltStyledStreamWriter + +/// Scoped enums are not available until C++11. +struct CommentStyle { + /// Decide whether to write comments. + enum Enum { + None, ///< Drop all comments. + Most, ///< Recover odd behavior of previous versions (not implemented yet). + All ///< Keep all comments. + }; +}; + +struct BuiltStyledStreamWriter : public StreamWriter { + BuiltStyledStreamWriter(String indentation, CommentStyle::Enum cs, + String colonSymbol, String nullSymbol, + String endingLineFeedSymbol, bool useSpecialFloats, + bool emitUTF8, unsigned int precision, + PrecisionType precisionType); + int write(Value const& root, OStream* sout) override; + +private: + void writeValue(Value const& value); + void writeArrayValue(Value const& value); + bool isMultilineArray(Value const& value); + void pushValue(String const& value); + void writeIndent(); + void writeWithIndent(String const& value); + void indent(); + void unindent(); + void writeCommentBeforeValue(Value const& root); + void writeCommentAfterValueOnSameLine(Value const& root); + static bool hasCommentForValue(const Value& value); + + using ChildValues = std::vector<String>; + + ChildValues childValues_; + String indentString_; + unsigned int rightMargin_; + String indentation_; + CommentStyle::Enum cs_; + String colonSymbol_; + String nullSymbol_; + String endingLineFeedSymbol_; + bool addChildValues_ : 1; + bool indented_ : 1; + bool useSpecialFloats_ : 1; + bool emitUTF8_ : 1; + unsigned int precision_; + PrecisionType precisionType_; +}; +BuiltStyledStreamWriter::BuiltStyledStreamWriter( + String indentation, CommentStyle::Enum cs, String colonSymbol, + String nullSymbol, String endingLineFeedSymbol, bool useSpecialFloats, + bool emitUTF8, unsigned int precision, PrecisionType precisionType) + : rightMargin_(74), indentation_(std::move(indentation)), cs_(cs), + colonSymbol_(std::move(colonSymbol)), nullSymbol_(std::move(nullSymbol)), + endingLineFeedSymbol_(std::move(endingLineFeedSymbol)), + addChildValues_(false), indented_(false), + useSpecialFloats_(useSpecialFloats), emitUTF8_(emitUTF8), + precision_(precision), precisionType_(precisionType) {} +int BuiltStyledStreamWriter::write(Value const& root, OStream* sout) { + sout_ = sout; + addChildValues_ = false; + indented_ = true; + indentString_.clear(); + writeCommentBeforeValue(root); + if (!indented_) + writeIndent(); + indented_ = true; + writeValue(root); + writeCommentAfterValueOnSameLine(root); + *sout_ << endingLineFeedSymbol_; + sout_ = nullptr; + return 0; +} +void BuiltStyledStreamWriter::writeValue(Value const& value) { + switch (value.type()) { + case nullValue: + pushValue(nullSymbol_); + break; + case intValue: + pushValue(valueToString(value.asLargestInt())); + break; + case uintValue: + pushValue(valueToString(value.asLargestUInt())); + break; + case realValue: + pushValue(valueToString(value.asDouble(), useSpecialFloats_, precision_, + precisionType_)); + break; + case stringValue: { + // Is NULL is possible for value.string_? No. + char const* str; + char const* end; + bool ok = value.getString(&str, &end); + if (ok) + pushValue( + valueToQuotedStringN(str, static_cast<size_t>(end - str), emitUTF8_)); + else + pushValue(""); + break; + } + case booleanValue: + pushValue(valueToString(value.asBool())); + break; + case arrayValue: + writeArrayValue(value); + break; + case objectValue: { + Value::Members members(value.getMemberNames()); + if (members.empty()) + pushValue("{}"); + else { + writeWithIndent("{"); + indent(); + auto it = members.begin(); + for (;;) { + String const& name = *it; + Value const& childValue = value[name]; + writeCommentBeforeValue(childValue); + writeWithIndent( + valueToQuotedStringN(name.data(), name.length(), emitUTF8_)); + *sout_ << colonSymbol_; + writeValue(childValue); + if (++it == members.end()) { + writeCommentAfterValueOnSameLine(childValue); + break; + } + *sout_ << ","; + writeCommentAfterValueOnSameLine(childValue); + } + unindent(); + writeWithIndent("}"); + } + } break; + } +} + +void BuiltStyledStreamWriter::writeArrayValue(Value const& value) { + unsigned size = value.size(); + if (size == 0) + pushValue("[]"); + else { + bool isMultiLine = (cs_ == CommentStyle::All) || isMultilineArray(value); + if (isMultiLine) { + writeWithIndent("["); + indent(); + bool hasChildValue = !childValues_.empty(); + unsigned index = 0; + for (;;) { + Value const& childValue = value[index]; + writeCommentBeforeValue(childValue); + if (hasChildValue) + writeWithIndent(childValues_[index]); + else { + if (!indented_) + writeIndent(); + indented_ = true; + writeValue(childValue); + indented_ = false; + } + if (++index == size) { + writeCommentAfterValueOnSameLine(childValue); + break; + } + *sout_ << ","; + writeCommentAfterValueOnSameLine(childValue); + } + unindent(); + writeWithIndent("]"); + } else // output on a single line + { + assert(childValues_.size() == size); + *sout_ << "["; + if (!indentation_.empty()) + *sout_ << " "; + for (unsigned index = 0; index < size; ++index) { + if (index > 0) + *sout_ << ((!indentation_.empty()) ? ", " : ","); + *sout_ << childValues_[index]; + } + if (!indentation_.empty()) + *sout_ << " "; + *sout_ << "]"; + } + } +} + +bool BuiltStyledStreamWriter::isMultilineArray(Value const& value) { + ArrayIndex const size = value.size(); + bool isMultiLine = size * 3 >= rightMargin_; + childValues_.clear(); + for (ArrayIndex index = 0; index < size && !isMultiLine; ++index) { + Value const& childValue = value[index]; + isMultiLine = ((childValue.isArray() || childValue.isObject()) && + !childValue.empty()); + } + if (!isMultiLine) // check if line length > max line length + { + childValues_.reserve(size); + addChildValues_ = true; + ArrayIndex lineLength = 4 + (size - 1) * 2; // '[ ' + ', '*n + ' ]' + for (ArrayIndex index = 0; index < size; ++index) { + if (hasCommentForValue(value[index])) { + isMultiLine = true; + } + writeValue(value[index]); + lineLength += static_cast<ArrayIndex>(childValues_[index].length()); + } + addChildValues_ = false; + isMultiLine = isMultiLine || lineLength >= rightMargin_; + } + return isMultiLine; +} + +void BuiltStyledStreamWriter::pushValue(String const& value) { + if (addChildValues_) + childValues_.push_back(value); + else + *sout_ << value; +} + +void BuiltStyledStreamWriter::writeIndent() { + // blep intended this to look at the so-far-written string + // to determine whether we are already indented, but + // with a stream we cannot do that. So we rely on some saved state. + // The caller checks indented_. + + if (!indentation_.empty()) { + // In this case, drop newlines too. + *sout_ << '\n' << indentString_; + } +} + +void BuiltStyledStreamWriter::writeWithIndent(String const& value) { + if (!indented_) + writeIndent(); + *sout_ << value; + indented_ = false; +} + +void BuiltStyledStreamWriter::indent() { indentString_ += indentation_; } + +void BuiltStyledStreamWriter::unindent() { + assert(indentString_.size() >= indentation_.size()); + indentString_.resize(indentString_.size() - indentation_.size()); +} + +void BuiltStyledStreamWriter::writeCommentBeforeValue(Value const& root) { + if (cs_ == CommentStyle::None) + return; + if (!root.hasComment(commentBefore)) + return; + + if (!indented_) + writeIndent(); + const String& comment = root.getComment(commentBefore); + String::const_iterator iter = comment.begin(); + while (iter != comment.end()) { + *sout_ << *iter; + if (*iter == '\n' && ((iter + 1) != comment.end() && *(iter + 1) == '/')) + // writeIndent(); // would write extra newline + *sout_ << indentString_; + ++iter; + } + indented_ = false; +} + +void BuiltStyledStreamWriter::writeCommentAfterValueOnSameLine( + Value const& root) { + if (cs_ == CommentStyle::None) + return; + if (root.hasComment(commentAfterOnSameLine)) + *sout_ << " " + root.getComment(commentAfterOnSameLine); + + if (root.hasComment(commentAfter)) { + writeIndent(); + *sout_ << root.getComment(commentAfter); + } +} + +// static +bool BuiltStyledStreamWriter::hasCommentForValue(const Value& value) { + return value.hasComment(commentBefore) || + value.hasComment(commentAfterOnSameLine) || + value.hasComment(commentAfter); +} + +/////////////// +// StreamWriter + +StreamWriter::StreamWriter() : sout_(nullptr) {} +StreamWriter::~StreamWriter() = default; +StreamWriter::Factory::~Factory() = default; +StreamWriterBuilder::StreamWriterBuilder() { setDefaults(&settings_); } +StreamWriterBuilder::~StreamWriterBuilder() = default; +StreamWriter* StreamWriterBuilder::newStreamWriter() const { + const String indentation = settings_["indentation"].asString(); + const String cs_str = settings_["commentStyle"].asString(); + const String pt_str = settings_["precisionType"].asString(); + const bool eyc = settings_["enableYAMLCompatibility"].asBool(); + const bool dnp = settings_["dropNullPlaceholders"].asBool(); + const bool usf = settings_["useSpecialFloats"].asBool(); + const bool emitUTF8 = settings_["emitUTF8"].asBool(); + unsigned int pre = settings_["precision"].asUInt(); + CommentStyle::Enum cs = CommentStyle::All; + if (cs_str == "All") { + cs = CommentStyle::All; + } else if (cs_str == "None") { + cs = CommentStyle::None; + } else { + throwRuntimeError("commentStyle must be 'All' or 'None'"); + } + PrecisionType precisionType(significantDigits); + if (pt_str == "significant") { + precisionType = PrecisionType::significantDigits; + } else if (pt_str == "decimal") { + precisionType = PrecisionType::decimalPlaces; + } else { + throwRuntimeError("precisionType must be 'significant' or 'decimal'"); + } + String colonSymbol = " : "; + if (eyc) { + colonSymbol = ": "; + } else if (indentation.empty()) { + colonSymbol = ":"; + } + String nullSymbol = "null"; + if (dnp) { + nullSymbol.clear(); + } + if (pre > 17) + pre = 17; + String endingLineFeedSymbol; + return new BuiltStyledStreamWriter(indentation, cs, colonSymbol, nullSymbol, + endingLineFeedSymbol, usf, emitUTF8, pre, + precisionType); +} + +bool StreamWriterBuilder::validate(Json::Value* invalid) const { + static const auto& valid_keys = *new std::set<String>{ + "indentation", + "commentStyle", + "enableYAMLCompatibility", + "dropNullPlaceholders", + "useSpecialFloats", + "emitUTF8", + "precision", + "precisionType", + }; + 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& StreamWriterBuilder::operator[](const String& key) { + return settings_[key]; +} +// static +void StreamWriterBuilder::setDefaults(Json::Value* settings) { + //! [StreamWriterBuilderDefaults] + (*settings)["commentStyle"] = "All"; + (*settings)["indentation"] = "\t"; + (*settings)["enableYAMLCompatibility"] = false; + (*settings)["dropNullPlaceholders"] = false; + (*settings)["useSpecialFloats"] = false; + (*settings)["emitUTF8"] = false; + (*settings)["precision"] = 17; + (*settings)["precisionType"] = "significant"; + //! [StreamWriterBuilderDefaults] +} + +String writeString(StreamWriter::Factory const& factory, Value const& root) { + OStringStream sout; + StreamWriterPtr const writer(factory.newStreamWriter()); + writer->write(root, &sout); + return sout.str(); +} + +OStream& operator<<(OStream& sout, Value const& root) { + StreamWriterBuilder builder; + StreamWriterPtr const writer(builder.newStreamWriter()); + writer->write(root, &sout); + return sout; +} + +} // namespace Json |