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/*
* Copyright (C) 2013 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 "core/html/HTMLDimension.h"
#include "wtf/MathExtras.h"
#include "wtf/text/WTFString.h"
namespace blink {
template <typename CharacterType>
static HTMLDimension parseDimension(const CharacterType* characters, size_t lastParsedIndex, size_t endOfCurrentToken)
{
HTMLDimension::HTMLDimensionType type = HTMLDimension::Absolute;
double value = 0.;
// HTML5's split removes leading and trailing spaces so we need to skip the leading spaces here.
while (lastParsedIndex < endOfCurrentToken && isASCIISpace((characters[lastParsedIndex])))
++lastParsedIndex;
// This is Step 5.5. in the algorithm. Going to the last step would make the code less readable.
if (lastParsedIndex >= endOfCurrentToken)
return HTMLDimension(value, HTMLDimension::Relative);
size_t position = lastParsedIndex;
while (position < endOfCurrentToken && isASCIIDigit(characters[position]))
++position;
if (position > lastParsedIndex) {
bool ok = false;
unsigned integerValue = charactersToUIntStrict(characters + lastParsedIndex, position - lastParsedIndex, &ok);
ASSERT(ok);
value += integerValue;
if (position < endOfCurrentToken && characters[position] == '.') {
++position;
Vector<CharacterType> fractionNumbers;
while (position < endOfCurrentToken && (isASCIIDigit(characters[position]) || isASCIISpace(characters[position]))) {
if (isASCIIDigit(characters[position]))
fractionNumbers.append(characters[position]);
++position;
}
if (fractionNumbers.size()) {
double fractionValue = charactersToUIntStrict(fractionNumbers.data(), fractionNumbers.size(), &ok);
ASSERT(ok);
value += fractionValue / pow(10., static_cast<double>(fractionNumbers.size()));
}
}
}
while (position < endOfCurrentToken && isASCIISpace(characters[position]))
++position;
if (position < endOfCurrentToken) {
if (characters[position] == '*')
type = HTMLDimension::Relative;
else if (characters[position] == '%')
type = HTMLDimension::Percentage;
}
return HTMLDimension(value, type);
}
static HTMLDimension parseDimension(const String& rawToken, size_t lastParsedIndex, size_t endOfCurrentToken)
{
if (rawToken.is8Bit())
return parseDimension<LChar>(rawToken.characters8(), lastParsedIndex, endOfCurrentToken);
return parseDimension<UChar>(rawToken.characters16(), lastParsedIndex, endOfCurrentToken);
}
// This implements the "rules for parsing a list of dimensions" per HTML5.
// http://www.whatwg.org/specs/web-apps/current-work/multipage/common-microsyntaxes.html#rules-for-parsing-a-list-of-dimensions
Vector<HTMLDimension> parseListOfDimensions(const String& input)
{
static const char comma = ',';
// Step 2. Remove the last character if it's a comma.
String trimmedString = input;
if (trimmedString.endsWith(comma))
trimmedString.truncate(trimmedString.length() - 1);
// HTML5's split doesn't return a token for an empty string so
// we need to match them here.
if (trimmedString.isEmpty())
return Vector<HTMLDimension>();
// Step 3. To avoid String copies, we just look for commas instead of splitting.
Vector<HTMLDimension> parsedDimensions;
size_t lastParsedIndex = 0;
while (true) {
size_t nextComma = trimmedString.find(comma, lastParsedIndex);
if (nextComma == kNotFound)
break;
parsedDimensions.append(parseDimension(trimmedString, lastParsedIndex, nextComma));
lastParsedIndex = nextComma + 1;
}
parsedDimensions.append(parseDimension(trimmedString, lastParsedIndex, trimmedString.length()));
return parsedDimensions;
}
} // namespace blink
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