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/*
* Copyright (C) 2010 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 "HTMLParserIdioms.h"
#include <wtf/MathExtras.h>
#include <wtf/dtoa.h>
#include <wtf/text/AtomicString.h>
namespace WebCore {
String stripLeadingAndTrailingHTMLSpaces(const String& string)
{
const UChar* characters = string.characters();
unsigned length = string.length();
unsigned numLeadingSpaces;
for (numLeadingSpaces = 0; numLeadingSpaces < length; ++numLeadingSpaces) {
if (isNotHTMLSpace(characters[numLeadingSpaces]))
break;
}
if (numLeadingSpaces == length)
return string.isNull() ? string : emptyAtom.string();
unsigned numTrailingSpaces;
for (numTrailingSpaces = 0; numTrailingSpaces < length; ++numTrailingSpaces) {
if (isNotHTMLSpace(characters[length - numTrailingSpaces - 1]))
break;
}
ASSERT(numLeadingSpaces + numTrailingSpaces < length);
return string.substring(numLeadingSpaces, length - (numLeadingSpaces + numTrailingSpaces));
}
String serializeForNumberType(double number)
{
// According to HTML5, "the best representation of the number n as a floating
// point number" is a string produced by applying ToString() to n.
NumberToStringBuffer buffer;
unsigned length = numberToString(number, buffer);
return String(buffer, length);
}
bool parseToDoubleForNumberType(const String& string, double* result)
{
// See HTML5 2.4.4.3 `Real numbers.'
// String::toDouble() accepts leading + and whitespace characters, which are not valid here.
UChar firstCharacter = string[0];
if (firstCharacter != '-' && !isASCIIDigit(firstCharacter))
return false;
bool valid = false;
double value = string.toDouble(&valid);
if (!valid)
return false;
// NaN and infinity are considered valid by String::toDouble, but not valid here.
if (!isfinite(value))
return false;
// Numbers are considered finite IEEE 754 single-precision floating point values.
// See HTML5 2.4.4.3 `Real numbers.'
if (-FLT_MAX > value || value > FLT_MAX)
return false;
if (result) {
// The following expression converts -0 to +0.
*result = value ? value : 0;
}
return true;
}
// http://www.whatwg.org/specs/web-apps/current-work/#rules-for-parsing-integers
bool parseHTMLInteger(const String& input, int& value)
{
// Step 1
// Step 2
const UChar* position = input.characters();
const UChar* end = position + input.length();
// Step 3
int sign = 1;
// Step 4
while (position < end) {
if (!isHTMLSpace(*position))
break;
++position;
}
// Step 5
if (position == end)
return false;
ASSERT(position < end);
// Step 6
if (*position == '-') {
sign = -1;
++position;
} else if (*position == '+')
++position;
if (position == end)
return false;
ASSERT(position < end);
// Step 7
if (!isASCIIDigit(*position))
return false;
// Step 8
Vector<UChar, 16> digits;
while (position < end) {
if (!isASCIIDigit(*position))
break;
digits.append(*position++);
}
// Step 9
value = sign * charactersToIntStrict(digits.data(), digits.size());
return true;
}
}
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