Source/platform/JSONValues.cpp

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
escapeChar
doubleQuoteString
asBoolean
asNumber
asNumber
asNumber
asNumber
asNumber
asString
asValue
asObject
asArray
asObject
asArray
toJSONString
writeJSON
asBoolean
asNumber
asNumber
asNumber
asNumber
asNumber
writeJSON
asString
writeJSON
asObject
asObject
openAccessors
getBoolean
getString
getObject
getArray
get
remove
writeJSON
m_order
asArray
asArray
writeJSON
m_data
get
/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "platform/JSONValues.h"

#include "wtf/DecimalNumber.h"
#include "wtf/dtoa.h"
#include "wtf/text/StringBuilder.h"

namespace WebCore {

namespace {

const char* const nullString = "null";
const char* const trueString = "true";
const char* const falseString = "false";

inline bool escapeChar(UChar c, StringBuilder* dst)
{
    switch (c) {
    case '\b': dst->append("\\b", 2); break;
    case '\f': dst->append("\\f", 2); break;
    case '\n': dst->append("\\n", 2); break;
    case '\r': dst->append("\\r", 2); break;
    case '\t': dst->append("\\t", 2); break;
    case '\\': dst->append("\\\\", 2); break;
    case '"': dst->append("\\\"", 2); break;
    default:
        return false;
    }
    return true;
}

inline void doubleQuoteString(const String& str, StringBuilder* dst)
{
    dst->append('"');
    for (unsigned i = 0; i < str.length(); ++i) {
        UChar c = str[i];
        if (!escapeChar(c, dst)) {
            if (c < 32 || c > 126 || c == '<' || c == '>') {
                // 1. Escaping <, > to prevent script execution.
                // 2. Technically, we could also pass through c > 126 as UTF8, but this
                //    is also optional. It would also be a pain to implement here.
                unsigned symbol = static_cast<unsigned>(c);
                String symbolCode = String::format("\\u%04X", symbol);
                dst->append(symbolCode);
            } else {
                dst->append(c);
            }
        }
    }
    dst->append('"');
}

} // anonymous namespace

bool JSONValue::asBoolean(bool*) const
{
    return false;
}

bool JSONValue::asNumber(double*) const
{
    return false;
}

bool JSONValue::asNumber(long*) const
{
    return false;
}

bool JSONValue::asNumber(int*) const
{
    return false;
}

bool JSONValue::asNumber(unsigned long*) const
{
    return false;
}

bool JSONValue::asNumber(unsigned*) const
{
    return false;
}

bool JSONValue::asString(String*) const
{
    return false;
}

bool JSONValue::asValue(RefPtr<JSONValue>* output)
{
    *output = this;
    return true;
}

bool JSONValue::asObject(RefPtr<JSONObject>*)
{
    return false;
}

bool JSONValue::asArray(RefPtr<JSONArray>*)
{
    return false;
}

PassRefPtr<JSONObject> JSONValue::asObject()
{
    return nullptr;
}

PassRefPtr<JSONArray> JSONValue::asArray()
{
    return nullptr;
}

String JSONValue::toJSONString() const
{
    StringBuilder result;
    result.reserveCapacity(512);
    writeJSON(&result);
    return result.toString();
}

void JSONValue::writeJSON(StringBuilder* output) const
{
    ASSERT(m_type == TypeNull);
    output->append(nullString, 4);
}

bool JSONBasicValue::asBoolean(bool* output) const
{
    if (type() != TypeBoolean)
        return false;
    *output = m_boolValue;
    return true;
}

bool JSONBasicValue::asNumber(double* output) const
{
    if (type() != TypeNumber)
        return false;
    *output = m_doubleValue;
    return true;
}

bool JSONBasicValue::asNumber(long* output) const
{
    if (type() != TypeNumber)
        return false;
    *output = static_cast<long>(m_doubleValue);
    return true;
}

bool JSONBasicValue::asNumber(int* output) const
{
    if (type() != TypeNumber)
        return false;
    *output = static_cast<int>(m_doubleValue);
    return true;
}

bool JSONBasicValue::asNumber(unsigned long* output) const
{
    if (type() != TypeNumber)
        return false;
    *output = static_cast<unsigned long>(m_doubleValue);
    return true;
}

bool JSONBasicValue::asNumber(unsigned* output) const
{
    if (type() != TypeNumber)
        return false;
    *output = static_cast<unsigned>(m_doubleValue);
    return true;
}

void JSONBasicValue::writeJSON(StringBuilder* output) const
{
    ASSERT(type() == TypeBoolean || type() == TypeNumber);
    if (type() == TypeBoolean) {
        if (m_boolValue)
            output->append(trueString, 4);
        else
            output->append(falseString, 5);
    } else if (type() == TypeNumber) {
        NumberToLStringBuffer buffer;
        if (!std::isfinite(m_doubleValue)) {
            output->append(nullString, 4);
            return;
        }
        DecimalNumber decimal = m_doubleValue;
        unsigned length = 0;
        if (decimal.bufferLengthForStringDecimal() > WTF::NumberToStringBufferLength) {
            // Not enough room for decimal. Use exponential format.
            if (decimal.bufferLengthForStringExponential() > WTF::NumberToStringBufferLength) {
                // Fallback for an abnormal case if it's too little even for exponential.
                output->append("NaN", 3);
                return;
            }
            length = decimal.toStringExponential(buffer, WTF::NumberToStringBufferLength);
        } else {
            length = decimal.toStringDecimal(buffer, WTF::NumberToStringBufferLength);
        }
        output->append(buffer, length);
    }
}

bool JSONString::asString(String* output) const
{
    *output = m_stringValue;
    return true;
}

void JSONString::writeJSON(StringBuilder* output) const
{
    ASSERT(type() == TypeString);
    doubleQuoteString(m_stringValue, output);
}

JSONObjectBase::~JSONObjectBase()
{
}

bool JSONObjectBase::asObject(RefPtr<JSONObject>* output)
{
    COMPILE_ASSERT(sizeof(JSONObject) == sizeof(JSONObjectBase), cannot_cast);
    *output = static_cast<JSONObject*>(this);
    return true;
}

PassRefPtr<JSONObject> JSONObjectBase::asObject()
{
    return openAccessors();
}

JSONObject* JSONObjectBase::openAccessors()
{
    COMPILE_ASSERT(sizeof(JSONObject) == sizeof(JSONObjectBase), cannot_cast);
    return static_cast<JSONObject*>(this);
}

bool JSONObjectBase::getBoolean(const String& name, bool* output) const
{
    RefPtr<JSONValue> value = get(name);
    if (!value)
        return false;
    return value->asBoolean(output);
}

bool JSONObjectBase::getString(const String& name, String* output) const
{
    RefPtr<JSONValue> value = get(name);
    if (!value)
        return false;
    return value->asString(output);
}

PassRefPtr<JSONObject> JSONObjectBase::getObject(const String& name) const
{
    RefPtr<JSONValue> value = get(name);
    if (!value)
        return nullptr;
    return value->asObject();
}

PassRefPtr<JSONArray> JSONObjectBase::getArray(const String& name) const
{
    RefPtr<JSONValue> value = get(name);
    if (!value)
        return nullptr;
    return value->asArray();
}

PassRefPtr<JSONValue> JSONObjectBase::get(const String& name) const
{
    Dictionary::const_iterator it = m_data.find(name);
    if (it == m_data.end())
        return nullptr;
    return it->value;
}

void JSONObjectBase::remove(const String& name)
{
    m_data.remove(name);
    for (size_t i = 0; i < m_order.size(); ++i) {
        if (m_order[i] == name) {
            m_order.remove(i);
            break;
        }
    }
}

void JSONObjectBase::writeJSON(StringBuilder* output) const
{
    output->append('{');
    for (size_t i = 0; i < m_order.size(); ++i) {
        Dictionary::const_iterator it = m_data.find(m_order[i]);
        ASSERT_WITH_SECURITY_IMPLICATION(it != m_data.end());
        if (i)
            output->append(',');
        doubleQuoteString(it->key, output);
        output->append(':');
        it->value->writeJSON(output);
    }
    output->append('}');
}

JSONObjectBase::JSONObjectBase()
    : JSONValue(TypeObject)
    , m_data()
    , m_order()
{
}

JSONArrayBase::~JSONArrayBase()
{
}

bool JSONArrayBase::asArray(RefPtr<JSONArray>* output)
{
    COMPILE_ASSERT(sizeof(JSONArrayBase) == sizeof(JSONArray), cannot_cast);
    *output = static_cast<JSONArray*>(this);
    return true;
}

PassRefPtr<JSONArray> JSONArrayBase::asArray()
{
    COMPILE_ASSERT(sizeof(JSONArrayBase) == sizeof(JSONArray), cannot_cast);
    return static_cast<JSONArray*>(this);
}

void JSONArrayBase::writeJSON(StringBuilder* output) const
{
    output->append('[');
    for (Vector<RefPtr<JSONValue> >::const_iterator it = m_data.begin(); it != m_data.end(); ++it) {
        if (it != m_data.begin())
            output->append(',');
        (*it)->writeJSON(output);
    }
    output->append(']');
}

JSONArrayBase::JSONArrayBase()
    : JSONValue(TypeArray)
    , m_data()
{
}

PassRefPtr<JSONValue> JSONArrayBase::get(size_t index)
{
    ASSERT_WITH_SECURITY_IMPLICATION(index < m_data.size());
    return m_data[index];
}

} // namespace WebCore
/* [<][>][^][v][top][bottom][index][help] */
root/Source/platform/JSONValues.cpp

DEFINITIONS
