| /* |
| * 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 WebCore { |
| |
| 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 WebCore |