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ZLMediaKit/3rdpart/jsoncpp/json_writer.cpp
xiongziliang 2f6773f180 添加完整的服务器用例
2019-05-20 11:22:59 +08:00

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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 "../jsoncpp/writer.h"
#include "../jsoncpp/json_tool.h"
#endif // if !defined(JSON_IS_AMALGAMATION)
#include <iomanip>
#include <memory>
#include <sstream>
#include <utility>
#include <set>
#include <cassert>
#include <cstring>
#include <cstdio>
#if defined(_MSC_VER) && _MSC_VER >= 1200 && _MSC_VER < 1800 // Between VC++ 6.0 and VC++ 11.0
#include <float.h>
#define isfinite _finite
#elif defined(__sun) && defined(__SVR4) //Solaris
#include <ieeefp.h>
#define isfinite finite
#else
#include <cmath>
#define isfinite std::isfinite
#endif
#if defined(_MSC_VER) && _MSC_VER < 1500 // VC++ 8.0 and below
#define snprintf _snprintf
#elif defined(__ANDROID__)
#define snprintf snprintf
#elif __cplusplus >= 201103L
#define snprintf std::snprintf
#endif
#if defined(__BORLANDC__)
#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 {
#if __cplusplus >= 201103L
typedef std::unique_ptr<StreamWriter> StreamWriterPtr;
#else
typedef std::auto_ptr<StreamWriter> StreamWriterPtr;
#endif
static bool containsControlCharacter(const char* str) {
while (*str) {
if (isControlCharacter(*(str++)))
return true;
}
return false;
}
static bool containsControlCharacter0(const char* str, unsigned len) {
char const* end = str + len;
while (end != str) {
if (isControlCharacter(*str) || 0==*str)
return true;
++str;
}
return false;
}
std::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;
}
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), "%.17g", value);
#else
len = sprintf_s(buffer, sizeof(buffer), "%.17g", value);
#endif
#else
if (isfinite(value)) {
len = snprintf(buffer, sizeof(buffer), "%.17g", 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;
}
// https://github.com/upcaste/upcaste/blob/master/src/upcore/src/cstring/strnpbrk.cpp
static char const* strnpbrk(char const* s, char const* accept, size_t n) {
assert((s || !n) && accept);
char const* const end = s + n;
for (char const* cur = s; cur < end; ++cur) {
int const c = *cur;
for (char const* a = accept; *a; ++a) {
if (*a == c) {
return cur;
}
}
}
return NULL;
}
static std::string valueToQuotedStringN(const char* value, unsigned length) {
if (value == NULL)
return "";
// Not sure how to handle unicode...
if (strnpbrk(value, "\"\\\b\f\n\r\t", length) == NULL &&
!containsControlCharacter0(value, length))
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 =
length * 2 + 3; // allescaped+quotes+NULL
std::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 ((isControlCharacter(*c)) || (*c == 0)) {
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:
{
// Is NULL possible for value.string_?
char const* str;
char const* end;
bool ok = value.getString(&str, &end);
if (ok) document_ += valueToQuotedStringN(str, static_cast<unsigned>(end-str));
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_ += valueToQuotedStringN(name.data(), static_cast<unsigned>(name.length()));
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:
{
// Is NULL possible for value.string_?
char const* str;
char const* end;
bool ok = value.getString(&str, &end);
if (ok) pushValue(valueToQuotedStringN(str, static_cast<unsigned>(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();
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) {
if (hasCommentForValue(value[index])) {
isMultiLine = true;
}
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();
const std::string& comment = root.getComment(commentBefore);
std::string::const_iterator iter = comment.begin();
while (iter != comment.end()) {
document_ += *iter;
if (*iter == '\n' &&
(iter != 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(std::string indentation)
: document_(NULL), rightMargin_(74), indentation_(indentation),
addChildValues_() {}
void StyledStreamWriter::write(std::ostream& out, const Value& root) {
document_ = &out;
addChildValues_ = false;
indentString_ = "";
indented_ = true;
writeCommentBeforeValue(root);
if (!indented_) writeIndent();
indented_ = true;
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:
{
// Is NULL possible for value.string_?
char const* str;
char const* end;
bool ok = value.getString(&str, &end);
if (ok) pushValue(valueToQuotedStringN(str, static_cast<unsigned>(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();
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 {
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::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) {
if (hasCommentForValue(value[index])) {
isMultiLine = true;
}
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() {
// 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 std::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 std::string& comment = root.getComment(commentBefore);
std::string::const_iterator iter = comment.begin();
while (iter != comment.end()) {
*document_ << *iter;
if (*iter == '\n' &&
(iter != 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(
std::string const& indentation,
CommentStyle::Enum cs,
std::string const& colonSymbol,
std::string const& nullSymbol,
std::string const& endingLineFeedSymbol);
virtual int write(Value const& root, std::ostream* sout);
private:
void writeValue(Value const& value);
void writeArrayValue(Value const& value);
bool isMultineArray(Value const& value);
void pushValue(std::string const& value);
void writeIndent();
void writeWithIndent(std::string const& value);
void indent();
void unindent();
void writeCommentBeforeValue(Value const& root);
void writeCommentAfterValueOnSameLine(Value const& root);
static bool hasCommentForValue(const Value& value);
typedef std::vector<std::string> ChildValues;
ChildValues childValues_;
std::string indentString_;
int rightMargin_;
std::string indentation_;
CommentStyle::Enum cs_;
std::string colonSymbol_;
std::string nullSymbol_;
std::string endingLineFeedSymbol_;
bool addChildValues_ : 1;
bool indented_ : 1;
};
BuiltStyledStreamWriter::BuiltStyledStreamWriter(
std::string const& indentation,
CommentStyle::Enum cs,
std::string const& colonSymbol,
std::string const& nullSymbol,
std::string const& endingLineFeedSymbol)
: rightMargin_(74)
, indentation_(indentation)
, cs_(cs)
, colonSymbol_(colonSymbol)
, nullSymbol_(nullSymbol)
, endingLineFeedSymbol_(endingLineFeedSymbol)
, addChildValues_(false)
, indented_(false)
{
}
int BuiltStyledStreamWriter::write(Value const& root, std::ostream* sout)
{
sout_ = sout;
addChildValues_ = false;
indented_ = true;
indentString_ = "";
writeCommentBeforeValue(root);
if (!indented_) writeIndent();
indented_ = true;
writeValue(root);
writeCommentAfterValueOnSameLine(root);
*sout_ << endingLineFeedSymbol_;
sout_ = NULL;
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()));
break;
case stringValue:
{
// Is NULL is possible for value.string_?
char const* str;
char const* end;
bool ok = value.getString(&str, &end);
if (ok) pushValue(valueToQuotedStringN(str, static_cast<unsigned>(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();
Value::Members::iterator it = members.begin();
for (;;) {
std::string const& name = *it;
Value const& childValue = value[name];
writeCommentBeforeValue(childValue);
writeWithIndent(valueToQuotedStringN(name.data(), static_cast<unsigned>(name.length())));
*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) || isMultineArray(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_ << ", ";
*sout_ << childValues_[index];
}
if (!indentation_.empty()) *sout_ << " ";
*sout_ << "]";
}
}
}
bool BuiltStyledStreamWriter::isMultineArray(Value const& value) {
int size = value.size();
bool isMultiLine = size * 3 >= rightMargin_;
childValues_.clear();
for (int index = 0; index < size && !isMultiLine; ++index) {
Value const& 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) {
if (hasCommentForValue(value[index])) {
isMultiLine = true;
}
writeValue(value[index]);
lineLength += int(childValues_[index].length());
}
addChildValues_ = false;
isMultiLine = isMultiLine || lineLength >= rightMargin_;
}
return isMultiLine;
}
void BuiltStyledStreamWriter::pushValue(std::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(std::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 std::string& comment = root.getComment(commentBefore);
std::string::const_iterator iter = comment.begin();
while (iter != comment.end()) {
*sout_ << *iter;
if (*iter == '\n' &&
(iter != 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_(NULL)
{
}
StreamWriter::~StreamWriter()
{
}
StreamWriter::Factory::~Factory()
{}
StreamWriterBuilder::StreamWriterBuilder()
{
setDefaults(&settings_);
}
StreamWriterBuilder::~StreamWriterBuilder()
{}
StreamWriter* StreamWriterBuilder::newStreamWriter() const
{
std::string indentation = settings_["indentation"].asString();
std::string cs_str = settings_["commentStyle"].asString();
bool eyc = settings_["enableYAMLCompatibility"].asBool();
bool dnp = settings_["dropNullPlaceholders"].asBool();
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'");
}
std::string colonSymbol = " : ";
if (eyc) {
colonSymbol = ": ";
} else if (indentation.empty()) {
colonSymbol = ":";
}
std::string nullSymbol = "null";
if (dnp) {
nullSymbol = "";
}
std::string endingLineFeedSymbol = "";
return new BuiltStyledStreamWriter(
indentation, cs,
colonSymbol, nullSymbol, endingLineFeedSymbol);
}
static void getValidWriterKeys(std::set<std::string>* valid_keys)
{
valid_keys->clear();
valid_keys->insert("indentation");
valid_keys->insert("commentStyle");
valid_keys->insert("enableYAMLCompatibility");
valid_keys->insert("dropNullPlaceholders");
}
bool StreamWriterBuilder::validate(Json::Value* invalid) const
{
Json::Value my_invalid;
if (!invalid) invalid = &my_invalid; // so we do not need to test for NULL
Json::Value& inv = *invalid;
std::set<std::string> valid_keys;
getValidWriterKeys(&valid_keys);
Value::Members keys = settings_.getMemberNames();
size_t n = keys.size();
for (size_t i = 0; i < n; ++i) {
std::string const& key = keys[i];
if (valid_keys.find(key) == valid_keys.end()) {
inv[key] = settings_[key];
}
}
return 0u == inv.size();
}
Value& StreamWriterBuilder::operator[](std::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;
//! [StreamWriterBuilderDefaults]
}
std::string writeString(StreamWriter::Factory const& builder, Value const& root) {
std::ostringstream sout;
StreamWriterPtr const writer(builder.newStreamWriter());
writer->write(root, &sout);
return sout.str();
}
std::ostream& operator<<(std::ostream& sout, Value const& root) {
StreamWriterBuilder builder;
StreamWriterPtr const writer(builder.newStreamWriter());
writer->write(root, &sout);
return sout;
}
} // namespace Json
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