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+/**
+ * QtJson - A simple class for parsing JSON data into a QVariant hierarchies and vice-versa.
+ * Copyright (C) 2011 Eeli Reilin
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * \file json.cpp
+ */
+
+#include <QDateTime>
+#include "json.h"
+
+namespace QtJson {
+ static QString dateFormat, dateTimeFormat;
+
+ static QByteArray join(const QList<QByteArray> &list, const QByteArray &sep);
+ static QVariant parseValue(const QString &json, int &index, bool &success);
+ static QVariant parseObject(const QString &json, int &index, bool &success);
+ static QVariant parseArray(const QString &json, int &index, bool &success);
+ static QVariant parseString(const QString &json, int &index, bool &success);
+ static QVariant parseNumber(const QString &json, int &index);
+ static int lastIndexOfNumber(const QString &json, int index);
+ static void eatWhitespace(const QString &json, int &index);
+ static int lookAhead(const QString &json, int index);
+ static int nextToken(const QString &json, int &index);
+
+ template<typename T>
+ QByteArray serializeMap(const T &map, bool &success) {
+ QByteArray str = "{ ";
+ QList<QByteArray> pairs;
+ for (typename T::const_iterator it = map.begin(), itend = map.end(); it != itend; ++it) {
+ QByteArray serializedValue = serialize(it.value());
+ if (serializedValue.isNull()) {
+ success = false;
+ break;
+ }
+ pairs << sanitizeString(it.key()).toUtf8() + " : " + serializedValue;
+ }
+
+ str += join(pairs, ", ");
+ str += " }";
+ return str;
+ }
+
+
+ /**
+ * parse
+ */
+ QVariant parse(const QString &json) {
+ bool success = true;
+ return parse(json, success);
+ }
+
+ /**
+ * parse
+ */
+ QVariant parse(const QString &json, bool &success) {
+ success = true;
+
+ // Return an empty QVariant if the JSON data is either null or empty
+ if (!json.isNull() || !json.isEmpty()) {
+ QString data = json;
+ // We'll start from index 0
+ int index = 0;
+
+ // Parse the first value
+ QVariant value = parseValue(data, index, success);
+
+ // Return the parsed value
+ return value;
+ } else {
+ // Return the empty QVariant
+ return QVariant();
+ }
+ }
+
+ QByteArray serialize(const QVariant &data) {
+ bool success = true;
+ return serialize(data, success);
+ }
+
+ QByteArray serialize(const QVariant &data, bool &success) {
+ QByteArray str;
+ success = true;
+
+ if (!data.isValid()) { // invalid or null?
+ str = "null";
+ } else if ((data.type() == QVariant::List) ||
+ (data.type() == QVariant::StringList)) { // variant is a list?
+ QList<QByteArray> values;
+ const QVariantList list = data.toList();
+ Q_FOREACH(const QVariant& v, list) {
+ QByteArray serializedValue = serialize(v);
+ if (serializedValue.isNull()) {
+ success = false;
+ break;
+ }
+ values << serializedValue;
+ }
+
+ str = "[ " + join( values, ", " ) + " ]";
+ } else if (data.type() == QVariant::Hash) { // variant is a hash?
+ str = serializeMap<>(data.toHash(), success);
+ } else if (data.type() == QVariant::Map) { // variant is a map?
+ str = serializeMap<>(data.toMap(), success);
+ } else if ((data.type() == QVariant::String) ||
+ (data.type() == QVariant::ByteArray)) {// a string or a byte array?
+ str = sanitizeString(data.toString()).toUtf8();
+ } else if (data.type() == QVariant::Double) { // double?
+ double value = data.toDouble();
+ if ((value - value) == 0.0) {
+ str = QByteArray::number(value, 'g');
+ if (!str.contains(".") && ! str.contains("e")) {
+ str += ".0";
+ }
+ } else {
+ success = false;
+ }
+ } else if (data.type() == QVariant::Bool) { // boolean value?
+ str = data.toBool() ? "true" : "false";
+ } else if (data.type() == QVariant::ULongLong) { // large unsigned number?
+ str = QByteArray::number(data.value<qulonglong>());
+ } else if (data.canConvert<qlonglong>()) { // any signed number?
+ str = QByteArray::number(data.value<qlonglong>());
+ } else if (data.canConvert<long>()) { //TODO: this code is never executed because all smaller types can be converted to qlonglong
+ str = QString::number(data.value<long>()).toUtf8();
+ } else if (data.type() == QVariant::DateTime) { // datetime value?
+ str = sanitizeString(dateTimeFormat.isEmpty()
+ ? data.toDateTime().toString()
+ : data.toDateTime().toString(dateTimeFormat)).toUtf8();
+ } else if (data.type() == QVariant::Date) { // date value?
+ str = sanitizeString(dateTimeFormat.isEmpty()
+ ? data.toDate().toString()
+ : data.toDate().toString(dateFormat)).toUtf8();
+ } else if (data.canConvert<QString>()) { // can value be converted to string?
+ // this will catch QUrl, ... (all other types which can be converted to string)
+ str = sanitizeString(data.toString()).toUtf8();
+ } else {
+ success = false;
+ }
+
+ if (success) {
+ return str;
+ } else {
+ return QByteArray();
+ }
+ }
+
+ QString serializeStr(const QVariant &data) {
+ return QString::fromUtf8(serialize(data));
+ }
+
+ QString serializeStr(const QVariant &data, bool &success) {
+ return QString::fromUtf8(serialize(data, success));
+ }
+
+
+ /**
+ * \enum JsonToken
+ */
+ enum JsonToken {
+ JsonTokenNone = 0,
+ JsonTokenCurlyOpen = 1,
+ JsonTokenCurlyClose = 2,
+ JsonTokenSquaredOpen = 3,
+ JsonTokenSquaredClose = 4,
+ JsonTokenColon = 5,
+ JsonTokenComma = 6,
+ JsonTokenString = 7,
+ JsonTokenNumber = 8,
+ JsonTokenTrue = 9,
+ JsonTokenFalse = 10,
+ JsonTokenNull = 11
+ };
+
+ QString sanitizeString(QString str) {
+ str.replace(QLatin1String("\\"), QLatin1String("\\\\"));
+ str.replace(QLatin1String("\""), QLatin1String("\\\""));
+ str.replace(QLatin1String("\b"), QLatin1String("\\b"));
+ str.replace(QLatin1String("\f"), QLatin1String("\\f"));
+ str.replace(QLatin1String("\n"), QLatin1String("\\n"));
+ str.replace(QLatin1String("\r"), QLatin1String("\\r"));
+ str.replace(QLatin1String("\t"), QLatin1String("\\t"));
+ return QString(QLatin1String("\"%1\"")).arg(str);
+ }
+
+ static QByteArray join(const QList<QByteArray> &list, const QByteArray &sep) {
+ QByteArray res;
+ Q_FOREACH(const QByteArray &i, list) {
+ if (!res.isEmpty()) {
+ res += sep;
+ }
+ res += i;
+ }
+ return res;
+ }
+
+ /**
+ * parseValue
+ */
+ static QVariant parseValue(const QString &json, int &index, bool &success) {
+ // Determine what kind of data we should parse by
+ // checking out the upcoming token
+ switch(lookAhead(json, index)) {
+ case JsonTokenString:
+ return parseString(json, index, success);
+ case JsonTokenNumber:
+ return parseNumber(json, index);
+ case JsonTokenCurlyOpen:
+ return parseObject(json, index, success);
+ case JsonTokenSquaredOpen:
+ return parseArray(json, index, success);
+ case JsonTokenTrue:
+ nextToken(json, index);
+ return QVariant(true);
+ case JsonTokenFalse:
+ nextToken(json, index);
+ return QVariant(false);
+ case JsonTokenNull:
+ nextToken(json, index);
+ return QVariant();
+ case JsonTokenNone:
+ break;
+ }
+
+ // If there were no tokens, flag the failure and return an empty QVariant
+ success = false;
+ return QVariant();
+ }
+
+ /**
+ * parseObject
+ */
+ static QVariant parseObject(const QString &json, int &index, bool &success) {
+ QVariantMap map;
+ int token;
+
+ // Get rid of the whitespace and increment index
+ nextToken(json, index);
+
+ // Loop through all of the key/value pairs of the object
+ bool done = false;
+ while (!done) {
+ // Get the upcoming token
+ token = lookAhead(json, index);
+
+ if (token == JsonTokenNone) {
+ success = false;
+ return QVariantMap();
+ } else if (token == JsonTokenComma) {
+ nextToken(json, index);
+ } else if (token == JsonTokenCurlyClose) {
+ nextToken(json, index);
+ return map;
+ } else {
+ // Parse the key/value pair's name
+ QString name = parseString(json, index, success).toString();
+
+ if (!success) {
+ return QVariantMap();
+ }
+
+ // Get the next token
+ token = nextToken(json, index);
+
+ // If the next token is not a colon, flag the failure
+ // return an empty QVariant
+ if (token != JsonTokenColon) {
+ success = false;
+ return QVariant(QVariantMap());
+ }
+
+ // Parse the key/value pair's value
+ QVariant value = parseValue(json, index, success);
+
+ if (!success) {
+ return QVariantMap();
+ }
+
+ // Assign the value to the key in the map
+ map[name] = value;
+ }
+ }
+
+ // Return the map successfully
+ return QVariant(map);
+ }
+
+ /**
+ * parseArray
+ */
+ static QVariant parseArray(const QString &json, int &index, bool &success) {
+ QVariantList list;
+
+ nextToken(json, index);
+
+ bool done = false;
+ while(!done) {
+ int token = lookAhead(json, index);
+
+ if (token == JsonTokenNone) {
+ success = false;
+ return QVariantList();
+ } else if (token == JsonTokenComma) {
+ nextToken(json, index);
+ } else if (token == JsonTokenSquaredClose) {
+ nextToken(json, index);
+ break;
+ } else {
+ QVariant value = parseValue(json, index, success);
+ if (!success) {
+ return QVariantList();
+ }
+ list.push_back(value);
+ }
+ }
+
+ return QVariant(list);
+ }
+
+ /**
+ * parseString
+ */
+ static QVariant parseString(const QString &json, int &index, bool &success) {
+ QString s;
+ QChar c;
+
+ eatWhitespace(json, index);
+
+ c = json[index++];
+
+ bool complete = false;
+ while(!complete) {
+ if (index == json.size()) {
+ break;
+ }
+
+ c = json[index++];
+
+ if (c == '\"') {
+ complete = true;
+ break;
+ } else if (c == '\\') {
+ if (index == json.size()) {
+ break;
+ }
+
+ c = json[index++];
+
+ if (c == '\"') {
+ s.append('\"');
+ } else if (c == '\\') {
+ s.append('\\');
+ } else if (c == '/') {
+ s.append('/');
+ } else if (c == 'b') {
+ s.append('\b');
+ } else if (c == 'f') {
+ s.append('\f');
+ } else if (c == 'n') {
+ s.append('\n');
+ } else if (c == 'r') {
+ s.append('\r');
+ } else if (c == 't') {
+ s.append('\t');
+ } else if (c == 'u') {
+ int remainingLength = json.size() - index;
+ if (remainingLength >= 4) {
+ QString unicodeStr = json.mid(index, 4);
+
+ int symbol = unicodeStr.toInt(0, 16);
+
+ s.append(QChar(symbol));
+
+ index += 4;
+ } else {
+ break;
+ }
+ }
+ } else {
+ s.append(c);
+ }
+ }
+
+ if (!complete) {
+ success = false;
+ return QVariant();
+ }
+
+ return QVariant(s);
+ }
+
+ /**
+ * parseNumber
+ */
+ static QVariant parseNumber(const QString &json, int &index) {
+ eatWhitespace(json, index);
+
+ int lastIndex = lastIndexOfNumber(json, index);
+ int charLength = (lastIndex - index) + 1;
+ QString numberStr;
+
+ numberStr = json.mid(index, charLength);
+
+ index = lastIndex + 1;
+ bool ok;
+
+ if (numberStr.contains('.')) {
+ return QVariant(numberStr.toDouble(NULL));
+ } else if (numberStr.startsWith('-')) {
+ int i = numberStr.toInt(&ok);
+ if (!ok) {
+ qlonglong ll = numberStr.toLongLong(&ok);
+ return ok ? ll : QVariant(numberStr);
+ }
+ return i;
+ } else {
+ uint u = numberStr.toUInt(&ok);
+ if (!ok) {
+ qulonglong ull = numberStr.toULongLong(&ok);
+ return ok ? ull : QVariant(numberStr);
+ }
+ return u;
+ }
+ }
+
+ /**
+ * lastIndexOfNumber
+ */
+ static int lastIndexOfNumber(const QString &json, int index) {
+ int lastIndex;
+
+ for(lastIndex = index; lastIndex < json.size(); lastIndex++) {
+ if (QString("0123456789+-.eE").indexOf(json[lastIndex]) == -1) {
+ break;
+ }
+ }
+
+ return lastIndex -1;
+ }
+
+ /**
+ * eatWhitespace
+ */
+ static void eatWhitespace(const QString &json, int &index) {
+ for(; index < json.size(); index++) {
+ if (QString(" \t\n\r").indexOf(json[index]) == -1) {
+ break;
+ }
+ }
+ }
+
+ /**
+ * lookAhead
+ */
+ static int lookAhead(const QString &json, int index) {
+ int saveIndex = index;
+ return nextToken(json, saveIndex);
+ }
+
+ /**
+ * nextToken
+ */
+ static int nextToken(const QString &json, int &index) {
+ eatWhitespace(json, index);
+
+ if (index == json.size()) {
+ return JsonTokenNone;
+ }
+
+ QChar c = json[index];
+ index++;
+ switch(c.toLatin1()) {
+ case '{': return JsonTokenCurlyOpen;
+ case '}': return JsonTokenCurlyClose;
+ case '[': return JsonTokenSquaredOpen;
+ case ']': return JsonTokenSquaredClose;
+ case ',': return JsonTokenComma;
+ case '"': return JsonTokenString;
+ case '0': case '1': case '2': case '3': case '4':
+ case '5': case '6': case '7': case '8': case '9':
+ case '-': return JsonTokenNumber;
+ case ':': return JsonTokenColon;
+ }
+ index--; // ^ WTF?
+
+ int remainingLength = json.size() - index;
+
+ // True
+ if (remainingLength >= 4) {
+ if (json[index] == 't' && json[index + 1] == 'r' &&
+ json[index + 2] == 'u' && json[index + 3] == 'e') {
+ index += 4;
+ return JsonTokenTrue;
+ }
+ }
+
+ // False
+ if (remainingLength >= 5) {
+ if (json[index] == 'f' && json[index + 1] == 'a' &&
+ json[index + 2] == 'l' && json[index + 3] == 's' &&
+ json[index + 4] == 'e') {
+ index += 5;
+ return JsonTokenFalse;
+ }
+ }
+
+ // Null
+ if (remainingLength >= 4) {
+ if (json[index] == 'n' && json[index + 1] == 'u' &&
+ json[index + 2] == 'l' && json[index + 3] == 'l') {
+ index += 4;
+ return JsonTokenNull;
+ }
+ }
+
+ return JsonTokenNone;
+ }
+
+ void setDateTimeFormat(const QString &format) {
+ dateTimeFormat = format;
+ }
+
+ void setDateFormat(const QString &format) {
+ dateFormat = format;
+ }
+
+ QString getDateTimeFormat() {
+ return dateTimeFormat;
+ }
+
+ QString getDateFormat() {
+ return dateFormat;
+ }
+
+} //end namespace
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