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Qt5 JSON parser

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This commit is contained in:
Dmitry Belyaev 2015-06-05 10:38:12 +03:00
parent 3f2b22f916
commit bf60ce66e6
7 changed files with 21 additions and 805 deletions
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7
CMakeLists.txt
View File

@ -5,7 +5,7 @@ set(CMAKE_DEBUG_POSTFIX _debug)
# Declare project
project(qtjsonsettings)
find_package(Qt4 REQUIRED)
find_package(Qt5 REQUIRED)
set(QT_DONTUSE_QTGUI TRUE)
include(${QT_USE_FILE})
@ -30,14 +30,13 @@ message("You are linking ${PROJECT_NAME}. I hope it makes your life easier.")
# SOURCE FILES AND DIRECTORIES
# simple sources
list(APPEND qtjsonsettings_SOURCES qtjsonsettings.cpp json.cpp jsonparser.cpp)
list(APPEND qtjsonsettings_SOURCES qtjsonsettings.cpp)
# simple headers
list(APPEND qtjsonsettings_HEADERS json.h)
list(APPEND qtjsonsettings_Q_HEADERS qtjsonsettings.h)
# if you use Q_OBJECT
qt4_wrap_cpp(qtjsonsettings_MOC_SOURCES ${qtjsonsettings_Q_HEADERS})
qt5_wrap_cpp(qtjsonsettings_MOC_SOURCES ${qtjsonsettings_Q_HEADERS})
# COMPILATION
add_library(${PROJECT_NAME} STATIC

287
json.cpp
View File

@ -1,287 +0,0 @@
/****************************************************************************
**
** Copyright (c) 2010 Girish Ramakrishnan <girish@forwardbias.in>
**
** Use, modification and distribution is allowed without limitation,
** warranty, liability or support of any kind.
**
****************************************************************************/
#include "json.h"
#include "jsonparser.cpp"
namespace Json {
QVariant parse(const QByteArray &json, QString *error)
{
JsonLexer lexer(json);
JsonParser parser;
if (!parser.parse(&lexer) && error)
{
*error = parser.errorMessage();
}
return parser.result();
}
static QByteArray escape(const QVariant &variant)
{
QString str = variant.toString();
QByteArray res;
res.reserve(str.length());
for (int i = 0; i < str.length(); i++)
{
if (str[i] == '\b')
{
res += "\\b";
}
else if (str[i] == '\f')
{
res += "\\f";
}
else if (str[i] == '\n')
{
res += "\\n";
}
else if (str[i] == '\r')
{
res += "\\r";
}
else if (str[i] == '\t')
{
res += "\\t";
}
else if (str[i] == '\"')
{
res += "\\\"";
}
else if (str[i] == '\\')
{
res += "\\\\";
}
else if (str[i].unicode() > 127)
{
res += "\\u" + QString::number(str[i].unicode(), 16).rightJustified(4, '0');
}
else
{
res += str[i].toAscii();
}
}
return res;
}
QByteArray stringify(const QVariant &variant)
{
QByteArray result;
if (variant.type() == QVariant::List || variant.type() == QVariant::StringList)
{
result += "[";
QVariantList list = variant.toList();
for (int i = 0; i < list.count(); i++)
{
if (i != 0)
result += ",";
result += stringify(list[i]);
}
result += "]";
}
else if (variant.type() == QVariant::Map)
{
QVariantMap map = variant.toMap();
QVariantMap::const_iterator it = map.constBegin();
result += "{";
while (it != map.constEnd())
{
if (it != map.constBegin())
result += ",";
result += "\"" + escape(it.key()) + "\":";
result += stringify(it.value());
++it;
}
result += "}";
}
else if (variant.type() == QVariant::String || variant.type() == QVariant::ByteArray)
{
result = "\"" + escape(variant) + "\"";
}
else if (variant.type() == QVariant::Double || (int) variant.type() == (int) QMetaType::Float)
{
result.setNum(variant.toDouble(), 'g', 15);
}
else if (variant.type() == QVariant::Bool)
{
result = variant.toBool() ? "true" : "false";
}
else if (variant.type() == QVariant::Invalid)
{
result = "null";
}
else if (variant.type() == QVariant::ULongLong)
{
result = QByteArray::number(variant.toULongLong());
}
else if (variant.type() == QVariant::LongLong)
{
result = QByteArray::number(variant.toLongLong());
}
else if (variant.type() == QVariant::Int)
{
result = QByteArray::number(variant.toInt());
}
else if (variant.type() == QVariant::UInt)
{
result = QByteArray::number(variant.toUInt());
}
else if (variant.type() == QVariant::Char)
{
QChar c = variant.toChar();
if (c.unicode() > 127)
result = "\\u" + QByteArray::number(c.unicode(), 16).rightJustified(4, '0');
else
result.append(c.toAscii());
}
else if (variant.canConvert<qlonglong> ())
{
result = QByteArray::number(variant.toLongLong());
}
else if (variant.canConvert<QString> ())
{
result = stringify(variant);
}
return result;
}
QByteArray prettyStringify(const QVariant &variant, int indent, int indent0)
{
QByteArray result;
QString indentstr0 = QString(indent0, ' ');
QString indentstr = QString(indent0 + indent, ' ');
switch ((int) variant.type())
{
case QVariant::List:
case QVariant::StringList:
{
result += indentstr0;
result += "[\n";
QVariantList list = variant.toList();
for (int i = 0; i < list.count(); i++)
{
if (i != 0)
result += ",\n";
if (list[i].type() != QVariant::Map && list[i].type() != QVariant::List && list[i].type()
!= QVariant::StringList)
result += indentstr;
result += prettyStringify(list[i], indent, indent0 + indent);
}
result += "\n";
result += indentstr0;
result += "]";
break;
}
case QVariant::Map:
{
QVariantMap map = variant.toMap();
QVariantMap::const_iterator it = map.constBegin();
result += indentstr0;
result += "{\n";
while (it != map.constEnd())
{
if (it != map.constBegin())
result += ",\n";
result += indentstr;
result += "\"" + escape(it.key()) + "\":";
if (it.value().type() == QVariant::Map || it.value().type() == QVariant::List || it.value().type()
== QVariant::StringList)
{
result += "\n";
}
result += prettyStringify(it.value(), indent, indent0 + indent);
++it;
}
result += "\n";
result += indentstr0;
result += "}";
break;
}
case QVariant::String:
case QVariant::ByteArray:
{
result = "\"" + escape(variant) + "\"";
break;
}
case QVariant::Double:
case QMetaType::Float:
{
result = QString::number(variant.toDouble(), 'g', 15).toUtf8();
break;
}
case QVariant::Bool:
{
result = variant.toBool() ? "true" : "false";
break;
}
case QVariant::Invalid:
{
result = "null";
break;
}
case QVariant::ULongLong:
{
result = QByteArray::number(variant.toULongLong());
break;
}
case QVariant::LongLong:
{
result = QByteArray::number(variant.toLongLong());
break;
}
case QVariant::Int:
{
result = QByteArray::number(variant.toInt());
break;
}
case QVariant::UInt:
{
result = QByteArray::number(variant.toUInt());
break;
}
case QVariant::Char:
{
QChar c = variant.toChar();
if (c.unicode() > 127)
result = "\\u" + QByteArray::number(c.unicode(), 16).rightJustified(4, '0');
else
result.append(c.toAscii());
break;
}
default:
{
if (variant.canConvert<qlonglong> ())
{
result = QByteArray::number(variant.toLongLong());
}
else if (variant.canConvert<QString> ())
{
result = stringify(variant);
}
break;
}
}
return result;
}
}

23
json.h
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@ -1,23 +0,0 @@
/****************************************************************************
**
** Copyright (c) 2010 Girish Ramakrishnan <girish@forwardbias.in>
**
** Use, modification and distribution is allowed without limitation,
** warranty, liability or support of any kind.
**
****************************************************************************/
#ifndef JSON_H
#define JSON_H
#include <QtCore/QByteArray>
#include <QtCore/QVariant>
namespace Json {
QVariant parse(const QByteArray &data, QString *error = 0);
QByteArray stringify(const QVariant &variant);
QByteArray prettyStringify(const QVariant &variant, int indent = 4, int indent0 = 0);
};
#endif // JSON_H

469
jsonparser.cpp
View File

@ -1,469 +0,0 @@
// This file was generated by qlalr - DO NOT EDIT!
#ifndef JSONPARSER_CPP
#define JSONPARSER_CPP
class JsonGrammar
{
public:
enum VariousConstants {
EOF_SYMBOL = 0,
ERROR = 12,
T_COLON = 7,
T_COMMA = 8,
T_FALSE = 9,
T_LCURLYBRACKET = 3,
T_LSQUAREBRACKET = 5,
T_NULL = 11,
T_NUMBER = 2,
T_RCURLYBRACKET = 4,
T_RSQUAREBRACKET = 6,
T_STRING = 1,
T_TRUE = 10,
ACCEPT_STATE = 12,
RULE_COUNT = 18,
STATE_COUNT = 26,
TERMINAL_COUNT = 13,
NON_TERMINAL_COUNT = 8,
GOTO_INDEX_OFFSET = 26,
GOTO_INFO_OFFSET = 37,
GOTO_CHECK_OFFSET = 37
};
static const char *const spell [];
static const short lhs [];
static const short rhs [];
#ifndef QLALR_NO_JSONGRAMMAR_DEBUG_INFO
static const int rule_index [];
static const int rule_info [];
#endif // QLALR_NO_JSONGRAMMAR_DEBUG_INFO
static const short goto_default [];
static const short action_default [];
static const short action_index [];
static const short action_info [];
static const short action_check [];
static inline int nt_action (int state, int nt)
{
const int yyn = action_index [GOTO_INDEX_OFFSET + state] + nt;
if (yyn < 0 || action_check [GOTO_CHECK_OFFSET + yyn] != nt)
return goto_default [nt];
return action_info [GOTO_INFO_OFFSET + yyn];
}
static inline int t_action (int state, int token)
{
const int yyn = action_index [state] + token;
if (yyn < 0 || action_check [yyn] != token)
return - action_default [state];
return action_info [yyn];
}
};
const char *const JsonGrammar::spell [] = {
"end of file", "string", "number", "{", "}", "[", "]", ":", ",", "false",
"true", "null", "error",
#ifndef QLALR_NO_JSONGRAMMAR_DEBUG_INFO
"Root", "Value", "Object", "Members", "Member", "Array", "Values",
"$accept"
#endif // QLALR_NO_JSONGRAMMAR_DEBUG_INFO
};
const short JsonGrammar::lhs [] = {
13, 15, 16, 16, 16, 17, 14, 14, 14, 14,
14, 14, 14, 18, 19, 19, 19, 20};
const short JsonGrammar::rhs [] = {
1, 3, 1, 3, 0, 3, 1, 1, 1, 1,
1, 1, 1, 3, 1, 3, 0, 2};
#ifndef QLALR_NO_JSONGRAMMAR_DEBUG_INFO
const int JsonGrammar::rule_info [] = {
13, 14
, 15, 3, 16, 4
, 16, 17
, 16, 16, 8, 17
, 16
, 17, 1, 7, 14
, 14, 9
, 14, 10
, 14, 11
, 14, 15
, 14, 18
, 14, 2
, 14, 1
, 18, 5, 19, 6
, 19, 14
, 19, 19, 8, 14
, 19
, 20, 13, 0};
const int JsonGrammar::rule_index [] = {
0, 2, 6, 8, 12, 13, 17, 19, 21, 23,
25, 27, 29, 31, 35, 37, 41, 42};
#endif // QLALR_NO_JSONGRAMMAR_DEBUG_INFO
const short JsonGrammar::action_default [] = {
0, 11, 10, 0, 7, 5, 17, 9, 12, 13,
8, 1, 18, 3, 0, 0, 0, 2, 4, 0,
6, 15, 0, 0, 14, 16};
const short JsonGrammar::goto_default [] = {
3, 11, 2, 14, 13, 1, 22, 0};
const short JsonGrammar::action_index [] = {
24, -13, -13, 0, -13, 12, 24, -13, -13, -13,
-13, -13, -13, -13, -1, -6, 12, -13, -13, 7,
-13, -13, -4, 24, -13, -13,
-8, -8, -8, -8, -8, -8, -1, -8, -8, -8,
-8, -8, -8, -8, -8, -8, -2, -8, -8, 0,
-8, -8, -8, 6, -8, -8};
const short JsonGrammar::action_info [] = {
12, 19, 24, 17, 23, 0, 0, 16, 9, 8,
5, 0, 6, 15, 0, 0, 4, 10, 7, 0,
0, 0, 0, 0, 0, 9, 8, 5, 0, 6,
0, 0, 0, 4, 10, 7, 0,
21, 20, 18, 0, 0, 0, 0, 25, 0, 0,
0, 0, 0, 0};
const short JsonGrammar::action_check [] = {
0, 7, 6, 4, 8, -1, -1, 8, 1, 2,
3, -1, 5, 1, -1, -1, 9, 10, 11, -1,
-1, -1, -1, -1, -1, 1, 2, 3, -1, 5,
-1, -1, -1, 9, 10, 11, -1,
1, 1, 4, -1, -1, -1, -1, 1, -1, -1,
-1, -1, -1, -1};
#line 28 "json.g"
/****************************************************************************
**
** Copyright (c) 2010 Girish Ramakrishnan <girish@forwardbias.in>
**
** Use, modification and distribution is allowed without limitation,
** warranty, liability or support of any kind.
**
****************************************************************************/
#ifndef JSONPARSER_P_H
#define JSONPARSER_P_H
#include <QString>
#include <QVariant>
#include <QVector>
class JsonLexer
{
public:
JsonLexer(const QByteArray &data);
~JsonLexer();
int lex();
QVariant symbol() const { return m_symbol; }
int lineNumber() const { return m_lineNumber; }
int pos() const { return m_pos; }
private:
int parseNumber();
int parseString();
int parseKeyword();
QByteArray m_data;
int m_lineNumber;
int m_pos;
QVariant m_symbol;
QHash<QByteArray, int> m_keywords;
};
class JsonParser : protected JsonGrammar
{
public:
JsonParser();
~JsonParser();
bool parse(JsonLexer *lex);
QVariant result() const { return m_result; }
QString errorMessage() const { return QString("%1 at line %2 pos %3").arg(m_errorMessage).arg(m_errorLineNumber).arg(m_errorPos); }
private:
void reallocateStack();
inline QVariant &sym(int index)
{ return m_symStack[m_tos + index - 1]; }
int m_tos;
QVector<int> m_stateStack;
QVector<QVariant> m_symStack;
QString m_errorMessage;
int m_errorLineNumber;
int m_errorPos;
QVariant m_result;
};
#endif // JSONPARSER_P_H
#line 96 "json.g"
/****************************************************************************
**
** Copyright (c) 2010 Girish Ramakrishnan <girish@forwardbias.in>
**
** Use, modification and distribution is allowed without limitation,
** warranty, liability or support of any kind.
**
****************************************************************************/
#include <QtDebug>
JsonLexer::JsonLexer(const QByteArray &ba)
: m_data(ba), m_lineNumber(1), m_pos(0)
{
m_keywords.insert("true", JsonGrammar::T_TRUE);
m_keywords.insert("false", JsonGrammar::T_FALSE);
m_keywords.insert("null", JsonGrammar::T_NULL);
}
JsonLexer::~JsonLexer()
{
}
int JsonLexer::parseString()
{
QString str;
bool esc = false;
++m_pos; // skip initial "
for (; m_pos < m_data.length(); ++m_pos) {
const char c = m_data[m_pos];
if (esc) {
if (c == 'b') str += '\b';
else if (c == 'f') str += '\f';
else if (c == 'n') str += '\n';
else if (c == 'r') str += '\r';
else if (c == 't') str += '\t';
else if (c == '\\') str += '\\';
else if (c == '\"') str += '\"';
else if (c == 'u' && m_pos+4<m_data.length()-1) {
QByteArray u1 = m_data.mid(m_pos+1, 2);
QByteArray u2 = m_data.mid(m_pos+3, 2);
bool ok;
str += QChar(u2.toInt(&ok, 16), u1.toInt(&ok, 16));
m_pos += 4;
} else {
str += c;
}
esc = false;
} else if (c == '\\') {
esc = true;
} else if (c == '\"') {
m_symbol = str;
++m_pos;
return JsonGrammar::T_STRING;
} else {
str += c;
}
}
return JsonGrammar::ERROR;
}
int JsonLexer::parseNumber()
{
int start = m_pos;
bool isDouble = false;
for (; m_pos < m_data.length(); ++m_pos) {
const char c = m_data[m_pos];
if (c == '+' || c == '-' || (c >= '0' && c <= '9'))
continue;
if (c == '.' || c == 'e' || c == 'E') {
isDouble = true;
continue;
}
break;
}
QByteArray number = QByteArray::fromRawData(m_data.constData()+start, m_pos-start);
bool ok;
if (!isDouble) {
m_symbol = number.toInt(&ok);
if (!ok)
m_symbol = number.toLongLong(&ok);
}
if (isDouble || !ok)
m_symbol = number.toDouble();
return JsonGrammar::T_NUMBER;
}
int JsonLexer::parseKeyword()
{
int start = m_pos;
for (; m_pos < m_data.length(); ++m_pos) {
const char c = m_data[m_pos];
if (c >= 'a' && c <= 'z')
continue;
break;
}
QByteArray keyword = QByteArray::fromRawData(m_data.constData()+start, m_pos-start);
if (m_keywords.contains(keyword))
return m_keywords.value(keyword);
return JsonGrammar::ERROR;
}
int JsonLexer::lex()
{
m_symbol.clear();
while (m_pos < m_data.length()) {
const char c = m_data[m_pos];
switch (c) {
case '[': ++m_pos; return JsonGrammar::T_LSQUAREBRACKET;
case ']': ++m_pos; return JsonGrammar::T_RSQUAREBRACKET;
case '{': ++m_pos; return JsonGrammar::T_LCURLYBRACKET;
case '}': ++m_pos; return JsonGrammar::T_RCURLYBRACKET;
case ':': ++m_pos; return JsonGrammar::T_COLON;
case ',': ++m_pos; return JsonGrammar::T_COMMA;
case ' ': case '\r': case '\t': case 'b': ++m_pos; break;
case '\n': ++m_pos; ++m_lineNumber; break;
case '"': return parseString();
default:
if (c == '+' || c == '-' || (c >= '0' && c <= '9')) {
return parseNumber();
}
if (c >= 'a' && c <= 'z') {
return parseKeyword();
}
return JsonGrammar::ERROR;
}
}
return JsonGrammar::EOF_SYMBOL;
}
JsonParser::JsonParser()
{
}
JsonParser::~JsonParser()
{
}
void JsonParser::reallocateStack()
{
int size = m_stateStack.size();
if (size == 0)
size = 128;
else
size <<= 1;
m_symStack.resize(size);
m_stateStack.resize(size);
}
bool JsonParser::parse(JsonLexer *lexer)
{
const int INITIAL_STATE = 0;
int yytoken = -1;
reallocateStack();
m_tos = 0;
m_stateStack[++m_tos] = INITIAL_STATE;
while (true) {
const int state = m_stateStack[m_tos];
if (yytoken == -1 && -TERMINAL_COUNT != action_index[state]) {
yytoken = lexer->lex();
}
int act = t_action(state, yytoken);
if (act == ACCEPT_STATE)
return true;
else if (act > 0) {
if (++m_tos == m_stateStack.size())
reallocateStack();
m_stateStack[m_tos] = act;
m_symStack[m_tos] = lexer->symbol();
yytoken = -1;
} else if (act < 0) {
int r = -act-1;
m_tos -= rhs[r];
act = m_stateStack.at(m_tos++);
switch (r) {
#line 276 "json.g"
case 0: { m_result = sym(1); break; }
#line 279 "json.g"
case 1: { sym(1) = sym(2); break; }
#line 284 "json.g"
case 3: { sym(1) = sym(1).toMap().unite(sym(3).toMap()); break; }
#line 287 "json.g"
case 4: { sym(1) = QVariantMap(); break; }
#line 290 "json.g"
case 5: { QVariantMap map; map.insert(sym(1).toString(), sym(3)); sym(1) = map; break; }
#line 293 "json.g"
case 6: { sym(1) = QVariant(false); break; }
#line 296 "json.g"
case 7: { sym(1) = QVariant(true); break; }
#line 305 "json.g"
case 13: { sym(1) = sym(2); break; }
#line 308 "json.g"
case 14: { QVariantList list; list.append(sym(1)); sym(1) = list; break; }
#line 311 "json.g"
case 15: { QVariantList list = sym(1).toList(); list.append(sym(3)); sym(1) = list; break; }
#line 314 "json.g"
case 16: { sym(1) = QVariantList(); break; }
#line 316 "json.g"
} // switch
m_stateStack[m_tos] = nt_action(act, lhs[r] - TERMINAL_COUNT);
} else {
int ers = state;
int shifts = 0;
int reduces = 0;
int expected_tokens[3];
for (int tk = 0; tk < TERMINAL_COUNT; ++tk) {
int k = t_action(ers, tk);
if (! k)
continue;
else if (k < 0)
++reduces;
else if (spell[tk]) {
if (shifts < 3)
expected_tokens[shifts] = tk;
++shifts;
}
}
m_errorLineNumber = lexer->lineNumber();
m_errorPos = lexer->pos();
m_errorMessage.clear();
if (shifts && shifts < 3) {
bool first = true;
for (int s = 0; s < shifts; ++s) {
if (first)
m_errorMessage += QLatin1String("Expected ");
else
m_errorMessage += QLatin1String(", ");
first = false;
m_errorMessage += QLatin1String("'");
m_errorMessage += QLatin1String(spell[expected_tokens[s]]);
m_errorMessage += QLatin1String("'");
}
}
return false;
}
}
return false;
}
#endif // JSONPARSER_CPP

31
qtjsonsettings.cpp
View File

@ -1,10 +1,6 @@
#include "qtjsonsettings.h"
#include "json.h"
#include <QtDebug>
#include <QtCore/QCoreApplication>
#include <QJsonDocument>
namespace {
@ -14,9 +10,9 @@ namespace {
{
case QVariant::Map:
{
QVariantMap vMap = element.toMap();
QVariantMap::ConstIterator it = vMap.constBegin();
QVariantMap::ConstIterator end = vMap.constEnd();
auto vMap = element.toMap();
auto it = vMap.constBegin();
auto end = vMap.constEnd();
for (; it != end; ++it)
{
@ -88,16 +84,19 @@ const QSettings::Format QtJsonSettings::json_format = QSettings::registerFormat(
bool QtJsonSettings::readJsonFile(QIODevice &device, QSettings::SettingsMap &map)
{
QString error;
QVariant parsed = Json::parse(device.readAll(), &error);
if (error.isEmpty())
QJsonParseError error;
auto document = QJsonDocument::fromJson(device.readAll(), &error);
if (QJsonParseError::NoError == error.error)
{
if (!document.isEmpty()){
QString str;
processReadKey(str, map, parsed);
processReadKey(str, map, document.toVariant());
}
}
else
{
qWarning() << error;
qWarning() << error.errorString();
}
return true;
@ -107,15 +106,15 @@ bool QtJsonSettings::writeJsonFile(QIODevice &device, const QSettings::SettingsM
{
QVariant resultMap;
QSettings::SettingsMap::ConstIterator it = map.constBegin();
QSettings::SettingsMap::ConstIterator end = map.constEnd();
auto it = map.constBegin();
auto end = map.constEnd();
for (; it != end; ++it)
{
resultMap = processWriteKey(resultMap, it.key(), it.value());
};
device.write(Json::prettyStringify(resultMap, 4));
device.write(QJsonDocument::fromVariant(resultMap).toJson());
return true;
}

4
qtjsonsettings.h
View File

@ -16,9 +16,9 @@ class QIODevice;
#endif
/**
* @brief Class for storing application setting in xml file. This class implements QSettings interface.
* @brief Class for storing application setting in json file. This class implements QSettings interface.
*
* @class QtXmlSettings qtxmlsettings.h
* @class QtJsonSettings qtjsonsettings.h
*/
class QTJSONSETTINGS_EXPORT QtJsonSettings: public QSettings
{

3
qtjsonsettings.pri
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@ -3,6 +3,3 @@ DEPENDPATH += $$PWD
HEADERS += $$PWD/qtjsonsettings.h
SOURCES += $$PWD/qtjsonsettings.cpp
HEADERS += $$PWD/json.h
SOURCES += $$PWD/json.cpp $$PWD/jsonparser.cpp