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Diffstat (limited to 'src/corelib/serialization/qjsonwriter.cpp')
-rw-r--r-- | src/corelib/serialization/qjsonwriter.cpp | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/src/corelib/serialization/qjsonwriter.cpp b/src/corelib/serialization/qjsonwriter.cpp new file mode 100644 index 0000000000..12ce20ef09 --- /dev/null +++ b/src/corelib/serialization/qjsonwriter.cpp @@ -0,0 +1,231 @@ +/**************************************************************************** +** +** Copyright (C) 2016 The Qt Company Ltd. +** Copyright (C) 2016 Intel Corporation. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtCore module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <cmath> +#include <qlocale.h> +#include "qjsonwriter_p.h" +#include "qjson_p.h" +#include "private/qutfcodec_p.h" + +QT_BEGIN_NAMESPACE + +using namespace QJsonPrivate; + +static void objectContentToJson(const QJsonPrivate::Object *o, QByteArray &json, int indent, bool compact); +static void arrayContentToJson(const QJsonPrivate::Array *a, QByteArray &json, int indent, bool compact); + +static inline uchar hexdig(uint u) +{ + return (u < 0xa ? '0' + u : 'a' + u - 0xa); +} + +static QByteArray escapedString(const QString &s) +{ + const uchar replacement = '?'; + QByteArray ba(s.length(), Qt::Uninitialized); + + uchar *cursor = reinterpret_cast<uchar *>(const_cast<char *>(ba.constData())); + const uchar *ba_end = cursor + ba.length(); + const ushort *src = reinterpret_cast<const ushort *>(s.constBegin()); + const ushort *const end = reinterpret_cast<const ushort *>(s.constEnd()); + + while (src != end) { + if (cursor >= ba_end - 6) { + // ensure we have enough space + int pos = cursor - (const uchar *)ba.constData(); + ba.resize(ba.size()*2); + cursor = (uchar *)ba.data() + pos; + ba_end = (const uchar *)ba.constData() + ba.length(); + } + + uint u = *src++; + if (u < 0x80) { + if (u < 0x20 || u == 0x22 || u == 0x5c) { + *cursor++ = '\\'; + switch (u) { + case 0x22: + *cursor++ = '"'; + break; + case 0x5c: + *cursor++ = '\\'; + break; + case 0x8: + *cursor++ = 'b'; + break; + case 0xc: + *cursor++ = 'f'; + break; + case 0xa: + *cursor++ = 'n'; + break; + case 0xd: + *cursor++ = 'r'; + break; + case 0x9: + *cursor++ = 't'; + break; + default: + *cursor++ = 'u'; + *cursor++ = '0'; + *cursor++ = '0'; + *cursor++ = hexdig(u>>4); + *cursor++ = hexdig(u & 0xf); + } + } else { + *cursor++ = (uchar)u; + } + } else { + if (QUtf8Functions::toUtf8<QUtf8BaseTraits>(u, cursor, src, end) < 0) + *cursor++ = replacement; + } + } + + ba.resize(cursor - (const uchar *)ba.constData()); + return ba; +} + +static void valueToJson(const QJsonPrivate::Base *b, const QJsonPrivate::Value &v, QByteArray &json, int indent, bool compact) +{ + QJsonValue::Type type = (QJsonValue::Type)(uint)v.type; + switch (type) { + case QJsonValue::Bool: + json += v.toBoolean() ? "true" : "false"; + break; + case QJsonValue::Double: { + const double d = v.toDouble(b); + if (qIsFinite(d)) { // +2 to format to ensure the expected precision + const double abs = std::abs(d); + json += QByteArray::number(d, abs == static_cast<quint64>(abs) ? 'f' : 'g', QLocale::FloatingPointShortest); + } else { + json += "null"; // +INF || -INF || NaN (see RFC4627#section2.4) + } + break; + } + case QJsonValue::String: + json += '"'; + json += escapedString(v.toString(b)); + json += '"'; + break; + case QJsonValue::Array: + json += compact ? "[" : "[\n"; + arrayContentToJson(static_cast<QJsonPrivate::Array *>(v.base(b)), json, indent + (compact ? 0 : 1), compact); + json += QByteArray(4*indent, ' '); + json += ']'; + break; + case QJsonValue::Object: + json += compact ? "{" : "{\n"; + objectContentToJson(static_cast<QJsonPrivate::Object *>(v.base(b)), json, indent + (compact ? 0 : 1), compact); + json += QByteArray(4*indent, ' '); + json += '}'; + break; + case QJsonValue::Null: + default: + json += "null"; + } +} + +static void arrayContentToJson(const QJsonPrivate::Array *a, QByteArray &json, int indent, bool compact) +{ + if (!a || !a->length) + return; + + QByteArray indentString(4*indent, ' '); + + uint i = 0; + while (1) { + json += indentString; + valueToJson(a, a->at(i), json, indent, compact); + + if (++i == a->length) { + if (!compact) + json += '\n'; + break; + } + + json += compact ? "," : ",\n"; + } +} + + +static void objectContentToJson(const QJsonPrivate::Object *o, QByteArray &json, int indent, bool compact) +{ + if (!o || !o->length) + return; + + QByteArray indentString(4*indent, ' '); + + uint i = 0; + while (1) { + QJsonPrivate::Entry *e = o->entryAt(i); + json += indentString; + json += '"'; + json += escapedString(e->key()); + json += compact ? "\":" : "\": "; + valueToJson(o, e->value, json, indent, compact); + + if (++i == o->length) { + if (!compact) + json += '\n'; + break; + } + + json += compact ? "," : ",\n"; + } +} + +void Writer::objectToJson(const QJsonPrivate::Object *o, QByteArray &json, int indent, bool compact) +{ + json.reserve(json.size() + (o ? (int)o->size : 16)); + json += compact ? "{" : "{\n"; + objectContentToJson(o, json, indent + (compact ? 0 : 1), compact); + json += QByteArray(4*indent, ' '); + json += compact ? "}" : "}\n"; +} + +void Writer::arrayToJson(const QJsonPrivate::Array *a, QByteArray &json, int indent, bool compact) +{ + json.reserve(json.size() + (a ? (int)a->size : 16)); + json += compact ? "[" : "[\n"; + arrayContentToJson(a, json, indent + (compact ? 0 : 1), compact); + json += QByteArray(4*indent, ' '); + json += compact ? "]" : "]\n"; +} + +QT_END_NAMESPACE |