| /* |
| * 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 "third_party/blink/renderer/core/html/html_dimension.h" |
| |
| #include "third_party/blink/renderer/core/html/parser/html_parser_idioms.h" |
| #include "third_party/blink/renderer/platform/wtf/math_extras.h" |
| #include "third_party/blink/renderer/platform/wtf/text/parsing_utilities.h" |
| #include "third_party/blink/renderer/platform/wtf/text/string_to_number.h" |
| #include "third_party/blink/renderer/platform/wtf/text/wtf_string.h" |
| |
| namespace blink { |
| |
| template <typename CharacterType> |
| static HTMLDimension ParseDimension(const CharacterType* characters, |
| size_t last_parsed_index, |
| size_t end_of_current_token) { |
| HTMLDimension::HTMLDimensionType type = HTMLDimension::kAbsolute; |
| double value = 0.; |
| |
| // HTML5's split removes leading and trailing spaces so we need to skip the |
| // leading spaces here. |
| while (last_parsed_index < end_of_current_token && |
| IsASCIISpace((characters[last_parsed_index]))) |
| ++last_parsed_index; |
| |
| // This is Step 5.5. in the algorithm. Going to the last step would make the |
| // code less readable. |
| if (last_parsed_index >= end_of_current_token) |
| return HTMLDimension(value, HTMLDimension::kRelative); |
| |
| size_t position = last_parsed_index; |
| while (position < end_of_current_token && IsASCIIDigit(characters[position])) |
| ++position; |
| |
| if (position > last_parsed_index) { |
| bool ok = false; |
| unsigned integer_value = CharactersToUInt( |
| characters + last_parsed_index, position - last_parsed_index, |
| WTF::NumberParsingOptions::kNone, &ok); |
| if (!ok) |
| return HTMLDimension(0., HTMLDimension::kRelative); |
| value += integer_value; |
| |
| if (position < end_of_current_token && characters[position] == '.') { |
| ++position; |
| Vector<CharacterType> fraction_numbers; |
| while (position < end_of_current_token && |
| (IsASCIIDigit(characters[position]) || |
| IsASCIISpace(characters[position]))) { |
| if (IsASCIIDigit(characters[position])) |
| fraction_numbers.push_back(characters[position]); |
| ++position; |
| } |
| |
| if (fraction_numbers.size()) { |
| double fraction_value = |
| CharactersToUInt(fraction_numbers.data(), fraction_numbers.size(), |
| WTF::NumberParsingOptions::kNone, &ok); |
| if (!ok) |
| return HTMLDimension(0., HTMLDimension::kRelative); |
| |
| value += fraction_value / |
| pow(10., static_cast<double>(fraction_numbers.size())); |
| } |
| } |
| } |
| |
| while (position < end_of_current_token && IsASCIISpace(characters[position])) |
| ++position; |
| |
| if (position < end_of_current_token) { |
| if (characters[position] == '*') |
| type = HTMLDimension::kRelative; |
| else if (characters[position] == '%') |
| type = HTMLDimension::kPercentage; |
| } |
| |
| return HTMLDimension(value, type); |
| } |
| |
| static HTMLDimension ParseDimension(const String& raw_token, |
| size_t last_parsed_index, |
| size_t end_of_current_token) { |
| if (raw_token.Is8Bit()) |
| return ParseDimension<LChar>(raw_token.Characters8(), last_parsed_index, |
| end_of_current_token); |
| return ParseDimension<UChar>(raw_token.Characters16(), last_parsed_index, |
| end_of_current_token); |
| } |
| |
| // 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 kComma = ','; |
| |
| // Step 2. Remove the last character if it's a comma. |
| String trimmed_string = input; |
| if (trimmed_string.EndsWith(kComma)) |
| trimmed_string.Truncate(trimmed_string.length() - 1); |
| |
| // HTML5's split doesn't return a token for an empty string so |
| // we need to match them here. |
| if (trimmed_string.IsEmpty()) |
| return Vector<HTMLDimension>(); |
| |
| // Step 3. To avoid String copies, we just look for commas instead of |
| // splitting. |
| Vector<HTMLDimension> parsed_dimensions; |
| wtf_size_t last_parsed_index = 0; |
| while (true) { |
| wtf_size_t next_comma = trimmed_string.find(kComma, last_parsed_index); |
| if (next_comma == kNotFound) |
| break; |
| |
| parsed_dimensions.push_back( |
| ParseDimension(trimmed_string, last_parsed_index, next_comma)); |
| last_parsed_index = next_comma + 1; |
| } |
| |
| parsed_dimensions.push_back(ParseDimension(trimmed_string, last_parsed_index, |
| trimmed_string.length())); |
| return parsed_dimensions; |
| } |
| |
| template <typename CharacterType> |
| static bool ParseDimensionValue(const CharacterType* current, |
| const CharacterType* end, |
| HTMLDimension& dimension) { |
| SkipWhile<CharacterType, IsHTMLSpace>(current, end); |
| // Deviation: HTML allows '+' here. |
| const CharacterType* number_start = current; |
| if (!SkipExactly<CharacterType, IsASCIIDigit>(current, end)) |
| return false; |
| SkipWhile<CharacterType, IsASCIIDigit>(current, end); |
| if (SkipExactly<CharacterType>(current, end, '.')) { |
| // Deviation: HTML requires a digit after the full stop to be able to treat |
| // the value as a percentage (if not, the '.' will considered "garbage", |
| // yielding a regular length.) Gecko and Edge does not. |
| SkipWhile<CharacterType, IsASCIIDigit>(current, end); |
| } |
| bool ok; |
| double value = CharactersToDouble(number_start, current - number_start, &ok); |
| if (!ok) |
| return false; |
| HTMLDimension::HTMLDimensionType type = HTMLDimension::kAbsolute; |
| if (current < end) { |
| if (*current == '%') { |
| type = HTMLDimension::kPercentage; |
| } else if (*current == '*') { |
| // Deviation: HTML does not recognize '*' in this context, and we don't |
| // treat it as a valid value. We do count it though, so this is purely |
| // for statistics. Note though that per the specced behavior, "<number>*" |
| // would be the same as "<number>" (i.e '*' would just be trailing |
| // garbage.) |
| type = HTMLDimension::kRelative; |
| } |
| } |
| dimension = HTMLDimension(value, type); |
| return true; |
| } |
| |
| // https://html.spec.whatwg.org/multipage/infrastructure.html#rules-for-parsing-dimension-values |
| bool ParseDimensionValue(const String& input, HTMLDimension& dimension) { |
| if (input.IsEmpty()) |
| return false; |
| if (input.Is8Bit()) { |
| return ParseDimensionValue(input.Characters8(), |
| input.Characters8() + input.length(), dimension); |
| } |
| return ParseDimensionValue(input.Characters16(), |
| input.Characters16() + input.length(), dimension); |
| } |
| |
| } // namespace blink |
