271 lines
8.7 KiB
C++
271 lines
8.7 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia. For licensing terms and
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** conditions see http://qt.digia.com/licensing. For further information
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** use the contact form at http://qt.digia.com/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Digia gives you certain additional
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** rights. These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qjsonwriter_p.h"
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#include "qjson_p.h"
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QT_BEGIN_NAMESPACE
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using namespace QJsonPrivate;
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static void objectContentToJson(const QJsonPrivate::Object *o, QByteArray &json, int indent, bool compact);
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static void arrayContentToJson(const QJsonPrivate::Array *a, QByteArray &json, int indent, bool compact);
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static inline uchar hexdig(uint u)
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{
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return (u < 0xa ? '0' + u : 'a' + u - 0xa);
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}
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static QByteArray escapedString(const QString &s)
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{
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const uchar replacement = '?';
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QByteArray ba(s.length(), Qt::Uninitialized);
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uchar *cursor = (uchar *)ba.data();
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const uchar *ba_end = cursor + ba.length();
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const QChar *ch = (const QChar *)s.constData();
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const QChar *end = ch + s.length();
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int surrogate_high = -1;
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while (ch < end) {
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if (cursor >= ba_end - 6) {
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// ensure we have enough space
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int pos = cursor - (const uchar *)ba.constData();
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ba.resize(ba.size()*2);
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cursor = (uchar *)ba.data() + pos;
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ba_end = (const uchar *)ba.constData() + ba.length();
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}
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uint u = ch->unicode();
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if (surrogate_high >= 0) {
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if (ch->isLowSurrogate()) {
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u = QChar::surrogateToUcs4(surrogate_high, u);
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surrogate_high = -1;
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} else {
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// high surrogate without low
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*cursor = replacement;
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++ch;
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surrogate_high = -1;
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continue;
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}
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} else if (ch->isLowSurrogate()) {
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// low surrogate without high
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*cursor = replacement;
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++ch;
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continue;
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} else if (ch->isHighSurrogate()) {
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surrogate_high = u;
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++ch;
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continue;
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}
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if (u < 0x80) {
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if (u < 0x20 || u == 0x22 || u == 0x5c) {
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*cursor++ = '\\';
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switch (u) {
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case 0x22:
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*cursor++ = '"';
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break;
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case 0x5c:
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*cursor++ = '\\';
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break;
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case 0x8:
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*cursor++ = 'b';
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break;
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case 0xc:
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*cursor++ = 'f';
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break;
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case 0xa:
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*cursor++ = 'n';
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break;
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case 0xd:
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*cursor++ = 'r';
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break;
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case 0x9:
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*cursor++ = 't';
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break;
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default:
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*cursor++ = 'u';
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*cursor++ = '0';
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*cursor++ = '0';
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*cursor++ = hexdig(u>>4);
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*cursor++ = hexdig(u & 0xf);
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}
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} else {
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*cursor++ = (uchar)u;
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}
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} else {
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if (u < 0x0800) {
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*cursor++ = 0xc0 | ((uchar) (u >> 6));
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} else {
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// is it one of the Unicode non-characters?
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if (QChar::isNonCharacter(u)) {
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*cursor++ = replacement;
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++ch;
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continue;
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}
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if (QChar::requiresSurrogates(u)) {
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*cursor++ = 0xf0 | ((uchar) (u >> 18));
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*cursor++ = 0x80 | (((uchar) (u >> 12)) & 0x3f);
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} else {
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*cursor++ = 0xe0 | (((uchar) (u >> 12)) & 0x3f);
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}
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*cursor++ = 0x80 | (((uchar) (u >> 6)) & 0x3f);
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}
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*cursor++ = 0x80 | ((uchar) (u&0x3f));
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}
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++ch;
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}
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ba.resize(cursor - (const uchar *)ba.constData());
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return ba;
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}
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static void valueToJson(const QJsonPrivate::Base *b, const QJsonPrivate::Value &v, QByteArray &json, int indent, bool compact)
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{
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QJsonValue::Type type = (QJsonValue::Type)(uint)v.type;
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switch (type) {
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case QJsonValue::Bool:
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json += v.toBoolean() ? "true" : "false";
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break;
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case QJsonValue::Double: {
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const double d = v.toDouble(b);
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if (qIsFinite(d)) // +2 to format to ensure the expected precision
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json += QByteArray::number(d, 'g', std::numeric_limits<double>::digits10 + 2); // ::digits10 is 15
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else
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json += "null"; // +INF || -INF || NaN (see RFC4627#section2.4)
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break;
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}
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case QJsonValue::String:
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json += '"';
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json += escapedString(v.toString(b));
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json += '"';
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break;
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case QJsonValue::Array:
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json += compact ? "[" : "[\n";
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arrayContentToJson(static_cast<QJsonPrivate::Array *>(v.base(b)), json, indent + (compact ? 0 : 1), compact);
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json += QByteArray(4*indent, ' ');
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json += "]";
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break;
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case QJsonValue::Object:
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json += compact ? "{" : "{\n";
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objectContentToJson(static_cast<QJsonPrivate::Object *>(v.base(b)), json, indent + (compact ? 0 : 1), compact);
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json += QByteArray(4*indent, ' ');
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json += "}";
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break;
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case QJsonValue::Null:
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default:
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json += "null";
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}
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}
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static void arrayContentToJson(const QJsonPrivate::Array *a, QByteArray &json, int indent, bool compact)
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{
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if (!a || !a->length)
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return;
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QByteArray indentString(4*indent, ' ');
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uint i = 0;
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while (1) {
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json += indentString;
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valueToJson(a, a->at(i), json, indent, compact);
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if (++i == a->length) {
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if (!compact)
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json += '\n';
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break;
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}
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json += compact ? "," : ",\n";
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}
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}
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static void objectContentToJson(const QJsonPrivate::Object *o, QByteArray &json, int indent, bool compact)
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{
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if (!o || !o->length)
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return;
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QByteArray indentString(4*indent, ' ');
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uint i = 0;
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while (1) {
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QJsonPrivate::Entry *e = o->entryAt(i);
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json += indentString;
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json += '"';
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json += escapedString(e->key());
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json += "\": ";
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valueToJson(o, e->value, json, indent, compact);
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if (++i == o->length) {
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if (!compact)
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json += '\n';
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break;
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}
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json += compact ? "," : ",\n";
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}
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}
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void Writer::objectToJson(const QJsonPrivate::Object *o, QByteArray &json, int indent, bool compact)
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{
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json.reserve(json.size() + (o ? (int)o->size : 16));
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json += compact ? "{" : "{\n";
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objectContentToJson(o, json, indent + (compact ? 0 : 1), compact);
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json += QByteArray(4*indent, ' ');
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json += compact ? "}" : "}\n";
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}
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void Writer::arrayToJson(const QJsonPrivate::Array *a, QByteArray &json, int indent, bool compact)
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{
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json.reserve(json.size() + (a ? (int)a->size : 16));
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json += compact ? "[" : "[\n";
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arrayContentToJson(a, json, indent + (compact ? 0 : 1), compact);
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json += QByteArray(4*indent, ' ');
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json += compact ? "]" : "]\n";
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}
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QT_END_NAMESPACE
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