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Copy pathjson_writer.cpp
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690 lines (630 loc) · 19 KB
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// Copyright 2011 Baptiste Lepilleur
// 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/writer.h>
#include "json_tool.h"
#endif // if !defined(JSON_IS_AMALGAMATION)
#include <utility>
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <sstream>
#include <iomanip>
#include <math.h>
#if defined(_MSC_VER) && _MSC_VER < 1500 // VC++ 8.0 and below
#include <float.h>
#define isfinite _finite
#define snprintf _snprintf
#endif
#if defined(_MSC_VER) && _MSC_VER >= 1400 // VC++ 8.0
// Disable warning about strdup being deprecated.
#pragma warning(disable : 4996)
#endif
namespace Json {
static bool containsControlCharacter(const char* str) {
while (*str) {
if (isControlCharacter(*(str++)))
return true;
}
return false;
}
std::string valueToString(LargestInt value) {
UIntToStringBuffer buffer;
char* current = buffer + sizeof(buffer);
bool isNegative = value < 0;
if (isNegative)
value = -value;
uintToString(LargestUInt(value), current);
if (isNegative)
*--current = '-';
assert(current >= buffer);
return current;
}
std::string valueToString(LargestUInt value) {
UIntToStringBuffer buffer;
char* current = buffer + sizeof(buffer);
uintToString(value, current);
assert(current >= buffer);
return current;
}
#if defined(JSON_HAS_INT64)
std::string valueToString(Int value) {
return valueToString(LargestInt(value));
}
std::string valueToString(UInt value) {
return valueToString(LargestUInt(value));
}
#endif // # if defined(JSON_HAS_INT64)
std::string valueToString(double value) {
// Allocate a buffer that is more than large enough to store the 16 digits of
// precision requested below.
char buffer[32];
int len = -1;
// Print into the buffer. We need not request the alternative representation
// that always has a decimal point because JSON doesn't distingish the
// concepts of reals and integers.
#if defined(_MSC_VER) && defined(__STDC_SECURE_LIB__) // Use secure version with
// visual studio 2005 to
// avoid warning.
#if defined(WINCE)
len = _snprintf(buffer, sizeof(buffer), "%.16g", value);
#else
len = sprintf_s(buffer, sizeof(buffer), "%.16g", value);
#endif
#else
if (isfinite(value)) {
len = snprintf(buffer, sizeof(buffer), "%.16g", value);
} else {
// IEEE standard states that NaN values will not compare to themselves
if (value != value) {
len = snprintf(buffer, sizeof(buffer), "null");
} else if (value < 0) {
len = snprintf(buffer, sizeof(buffer), "-1e+9999");
} else {
len = snprintf(buffer, sizeof(buffer), "1e+9999");
}
// For those, we do not need to call fixNumLoc, but it is fast.
}
#endif
assert(len >= 0);
fixNumericLocale(buffer, buffer + len);
return buffer;
}
std::string valueToString(bool value) { return value ? "true" : "false"; }
std::string valueToQuotedString(const char* value) {
if (value == NULL)
return "";
// Not sure how to handle unicode...
if (strpbrk(value, "\"\\\b\f\n\r\t") == NULL &&
!containsControlCharacter(value))
return std::string("\"") + value + "\"";
// We have to walk value and escape any special characters.
// Appending to std::string is not efficient, but this should be rare.
// (Note: forward slashes are *not* rare, but I am not escaping them.)
std::string::size_type maxsize =
strlen(value) * 2 + 3; // allescaped+quotes+NULL
std::string result;
result.reserve(maxsize); // to avoid lots of mallocs
result += "\"";
for (const char* c = value; *c != 0; ++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 (isControlCharacter(*c)) {
std::ostringstream oss;
oss << "\\u" << std::hex << std::uppercase << std::setfill('0')
<< std::setw(4) << static_cast<int>(*c);
result += oss.str();
} else {
result += *c;
}
break;
}
}
result += "\"";
return result;
}
// Class Writer
// //////////////////////////////////////////////////////////////////
Writer::~Writer() {}
// Class FastWriter
// //////////////////////////////////////////////////////////////////
FastWriter::FastWriter()
: yamlCompatiblityEnabled_(false), dropNullPlaceholders_(false),
omitEndingLineFeed_(false) {}
void FastWriter::enableYAMLCompatibility() { yamlCompatiblityEnabled_ = true; }
void FastWriter::dropNullPlaceholders() { dropNullPlaceholders_ = true; }
void FastWriter::omitEndingLineFeed() { omitEndingLineFeed_ = true; }
std::string FastWriter::write(const Value& root) {
document_ = "";
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:
document_ += valueToQuotedString(value.asCString());
break;
case booleanValue:
document_ += valueToString(value.asBool());
break;
case arrayValue: {
document_ += '[';
int size = value.size();
for (int index = 0; index < size; ++index) {
if (index > 0)
document_ += ',';
writeValue(value[index]);
}
document_ += ']';
} break;
case objectValue: {
Value::Members members(value.getMemberNames());
document_ += '{';
for (Value::Members::iterator it = members.begin(); it != members.end();
++it) {
const std::string& name = *it;
if (it != members.begin())
document_ += ',';
document_ += valueToQuotedString(name.c_str());
document_ += yamlCompatiblityEnabled_ ? ": " : ":";
writeValue(value[name]);
}
document_ += '}';
} break;
}
}
// Class StyledWriter
// //////////////////////////////////////////////////////////////////
StyledWriter::StyledWriter()
: rightMargin_(74), indentSize_(3), addChildValues_() {}
std::string StyledWriter::write(const Value& root) {
document_ = "";
addChildValues_ = false;
indentString_ = "";
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:
pushValue(valueToQuotedString(value.asCString()));
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();
Value::Members::iterator it = members.begin();
for (;;) {
const std::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) {
unsigned size = value.size();
if (size == 0)
pushValue("[]");
else {
bool isArrayMultiLine = isMultineArray(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 {
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 (unsigned index = 0; index < size; ++index) {
if (index > 0)
document_ += ", ";
document_ += childValues_[index];
}
document_ += " ]";
}
}
}
bool StyledWriter::isMultineArray(const Value& value) {
int size = value.size();
bool isMultiLine = size * 3 >= rightMargin_;
childValues_.clear();
for (int index = 0; index < size && !isMultiLine; ++index) {
const Value& childValue = value[index];
isMultiLine =
isMultiLine || ((childValue.isArray() || childValue.isObject()) &&
childValue.size() > 0);
}
if (!isMultiLine) // check if line length > max line length
{
childValues_.reserve(size);
addChildValues_ = true;
int lineLength = 4 + (size - 1) * 2; // '[ ' + ', '*n + ' ]'
for (int index = 0; index < size; ++index) {
writeValue(value[index]);
lineLength += int(childValues_[index].length());
}
addChildValues_ = false;
isMultiLine = isMultiLine || lineLength >= rightMargin_;
}
return isMultiLine;
}
void StyledWriter::pushValue(const std::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 std::string& value) {
writeIndent();
document_ += value;
}
void StyledWriter::indent() { indentString_ += std::string(indentSize_, ' '); }
void StyledWriter::unindent() {
assert(int(indentString_.size()) >= indentSize_);
indentString_.resize(indentString_.size() - indentSize_);
}
void StyledWriter::writeCommentBeforeValue(const Value& root) {
if (!root.hasComment(commentBefore))
return;
document_ += "\n";
writeIndent();
std::string normalizedComment = normalizeEOL(root.getComment(commentBefore));
std::string::const_iterator iter = normalizedComment.begin();
while (iter != normalizedComment.end()) {
document_ += *iter;
if (*iter == '\n' && *(iter + 1) == '/')
writeIndent();
++iter;
}
// Comments are stripped of newlines, so add one here
document_ += "\n";
}
void StyledWriter::writeCommentAfterValueOnSameLine(const Value& root) {
if (root.hasComment(commentAfterOnSameLine))
document_ += " " + normalizeEOL(root.getComment(commentAfterOnSameLine));
if (root.hasComment(commentAfter)) {
document_ += "\n";
document_ += normalizeEOL(root.getComment(commentAfter));
document_ += "\n";
}
}
bool StyledWriter::hasCommentForValue(const Value& value) {
return value.hasComment(commentBefore) ||
value.hasComment(commentAfterOnSameLine) ||
value.hasComment(commentAfter);
}
std::string StyledWriter::normalizeEOL(const std::string& text) {
std::string normalized;
normalized.reserve(text.length());
const char* begin = text.c_str();
const char* end = begin + text.length();
const char* current = begin;
while (current != end) {
char c = *current++;
if (c == '\r') // mac or dos EOL
{
if (*current == '\n') // convert dos EOL
++current;
normalized += '\n';
} else // handle unix EOL & other char
normalized += c;
}
return normalized;
}
// Class StyledStreamWriter
// //////////////////////////////////////////////////////////////////
StyledStreamWriter::StyledStreamWriter(std::string indentation)
: document_(NULL), rightMargin_(74), indentation_(indentation),
addChildValues_() {}
void StyledStreamWriter::write(std::ostream& out, const Value& root) {
document_ = &out;
addChildValues_ = false;
indentString_ = "";
writeCommentBeforeValue(root);
writeValue(root);
writeCommentAfterValueOnSameLine(root);
*document_ << "\n";
document_ = NULL; // 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:
pushValue(valueToQuotedString(value.asCString()));
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();
Value::Members::iterator it = members.begin();
for (;;) {
const std::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 = isMultineArray(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 {
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 (unsigned index = 0; index < size; ++index) {
if (index > 0)
*document_ << ", ";
*document_ << childValues_[index];
}
*document_ << " ]";
}
}
}
bool StyledStreamWriter::isMultineArray(const Value& value) {
int size = value.size();
bool isMultiLine = size * 3 >= rightMargin_;
childValues_.clear();
for (int index = 0; index < size && !isMultiLine; ++index) {
const Value& childValue = value[index];
isMultiLine =
isMultiLine || ((childValue.isArray() || childValue.isObject()) &&
childValue.size() > 0);
}
if (!isMultiLine) // check if line length > max line length
{
childValues_.reserve(size);
addChildValues_ = true;
int lineLength = 4 + (size - 1) * 2; // '[ ' + ', '*n + ' ]'
for (int index = 0; index < size; ++index) {
writeValue(value[index]);
lineLength += int(childValues_[index].length());
}
addChildValues_ = false;
isMultiLine = isMultiLine || lineLength >= rightMargin_;
}
return isMultiLine;
}
void StyledStreamWriter::pushValue(const std::string& value) {
if (addChildValues_)
childValues_.push_back(value);
else
*document_ << value;
}
void StyledStreamWriter::writeIndent() {
/*
Some comments in this method would have been nice. ;-)
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_ << '\n' << indentString_;
}
void StyledStreamWriter::writeWithIndent(const std::string& value) {
writeIndent();
*document_ << value;
}
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;
*document_ << normalizeEOL(root.getComment(commentBefore));
*document_ << "\n";
}
void StyledStreamWriter::writeCommentAfterValueOnSameLine(const Value& root) {
if (root.hasComment(commentAfterOnSameLine))
*document_ << " " + normalizeEOL(root.getComment(commentAfterOnSameLine));
if (root.hasComment(commentAfter)) {
*document_ << "\n";
*document_ << normalizeEOL(root.getComment(commentAfter));
*document_ << "\n";
}
}
bool StyledStreamWriter::hasCommentForValue(const Value& value) {
return value.hasComment(commentBefore) ||
value.hasComment(commentAfterOnSameLine) ||
value.hasComment(commentAfter);
}
std::string StyledStreamWriter::normalizeEOL(const std::string& text) {
std::string normalized;
normalized.reserve(text.length());
const char* begin = text.c_str();
const char* end = begin + text.length();
const char* current = begin;
while (current != end) {
char c = *current++;
if (c == '\r') // mac or dos EOL
{
if (*current == '\n') // convert dos EOL
++current;
normalized += '\n';
} else // handle unix EOL & other char
normalized += c;
}
return normalized;
}
std::ostream& operator<<(std::ostream& sout, const Value& root) {
Json::StyledStreamWriter writer;
writer.write(sout, root);
return sout;
}
} // namespace Json