| /* |
| * Copyright (C) 2010-2017 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. |
| */ |
| |
| #pragma once |
| |
| #include <unicode/uchar.h> |
| #include <wtf/Expected.h> |
| #include <wtf/text/StringView.h> |
| |
| namespace WebCore { |
| |
| class Decimal; |
| class QualifiedName; |
| |
| // Space characters as defined by the HTML specification. |
| template<typename CharacterType> bool isHTMLSpace(CharacterType); |
| template<typename CharacterType> bool isNotHTMLSpace(CharacterType); |
| template<typename CharacterType> bool isComma(CharacterType); |
| template<typename CharacterType> bool isHTMLSpaceOrComma(CharacterType); |
| bool isHTMLLineBreak(UChar); |
| bool isHTMLSpaceButNotLineBreak(UChar); |
| |
| // 2147483647 is 2^31 - 1. |
| static const unsigned maxHTMLNonNegativeInteger = 2147483647; |
| |
| // Strip leading and trailing whitespace as defined by the HTML specification. |
| WEBCORE_EXPORT String stripLeadingAndTrailingHTMLSpaces(const String&); |
| |
| // An implementation of the HTML specification's algorithm to convert a number to a string for number and range types. |
| String serializeForNumberType(const Decimal&); |
| String serializeForNumberType(double); |
| |
| // Convert the specified string to a decimal/double. If the conversion fails, the return value is fallback value or NaN if not specified. |
| // Leading or trailing illegal characters cause failure, as does passing an empty string. |
| // The double* parameter may be 0 to check if the string can be parsed without getting the result. |
| Decimal parseToDecimalForNumberType(StringView); |
| Decimal parseToDecimalForNumberType(StringView, const Decimal& fallbackValue); |
| double parseToDoubleForNumberType(StringView); |
| double parseToDoubleForNumberType(StringView, double fallbackValue); |
| |
| // http://www.whatwg.org/specs/web-apps/current-work/#rules-for-parsing-integers |
| enum class HTMLIntegerParsingError { NegativeOverflow, PositiveOverflow, Other }; |
| |
| WEBCORE_EXPORT Expected<int, HTMLIntegerParsingError> parseHTMLInteger(StringView); |
| |
| // http://www.whatwg.org/specs/web-apps/current-work/#rules-for-parsing-non-negative-integers |
| WEBCORE_EXPORT Expected<unsigned, HTMLIntegerParsingError> parseHTMLNonNegativeInteger(StringView); |
| |
| // https://html.spec.whatwg.org/#valid-non-negative-integer |
| std::optional<int> parseValidHTMLNonNegativeInteger(StringView); |
| |
| // https://html.spec.whatwg.org/#valid-floating-point-number |
| std::optional<double> parseValidHTMLFloatingPointNumber(StringView); |
| |
| // https://html.spec.whatwg.org/multipage/infrastructure.html#rules-for-parsing-floating-point-number-values |
| Vector<double> parseHTMLListOfOfFloatingPointNumberValues(StringView); |
| |
| // https://html.spec.whatwg.org/multipage/semantics.html#attr-meta-http-equiv-refresh |
| bool parseMetaHTTPEquivRefresh(StringView, double& delay, String& url); |
| |
| // https://html.spec.whatwg.org/multipage/infrastructure.html#cors-settings-attribute |
| String parseCORSSettingsAttribute(const AtomString&); |
| |
| bool threadSafeMatch(const QualifiedName&, const QualifiedName&); |
| |
| AtomString parseHTMLHashNameReference(StringView); |
| |
| // https://html.spec.whatwg.org/#rules-for-parsing-dimension-values |
| struct HTMLDimension { |
| enum class Type : bool { Percentage, Pixel }; |
| double number; |
| Type type; |
| }; |
| std::optional<HTMLDimension> parseHTMLDimension(StringView); |
| std::optional<HTMLDimension> parseHTMLMultiLength(StringView); |
| |
| // Inline implementations of some of the functions declared above. |
| |
| template<typename CharacterType> inline bool isHTMLSpace(CharacterType character) |
| { |
| // Histogram from Apple's page load test combined with some ad hoc browsing some other test suites. |
| // |
| // 82%: 216330 non-space characters, all > U+0020 |
| // 11%: 30017 plain space characters, U+0020 |
| // 5%: 12099 newline characters, U+000A |
| // 2%: 5346 tab characters, U+0009 |
| // |
| // No other characters seen. No U+000C or U+000D, and no other control characters. |
| // Accordingly, we check for non-spaces first, then space, then newline, then tab, then the other characters. |
| |
| return character <= ' ' && (character == ' ' || character == '\n' || character == '\t' || character == '\r' || character == '\f'); |
| } |
| |
| template<typename CharacterType> inline bool isNotHTMLSpace(CharacterType character) |
| { |
| return !isHTMLSpace(character); |
| } |
| |
| inline bool isHTMLLineBreak(UChar character) |
| { |
| return character <= '\r' && (character == '\n' || character == '\r'); |
| } |
| |
| template<typename CharacterType> inline bool isComma(CharacterType character) |
| { |
| return character == ','; |
| } |
| |
| template<typename CharacterType> inline bool isHTMLSpaceOrComma(CharacterType character) |
| { |
| return isComma(character) || isHTMLSpace(character); |
| } |
| |
| inline bool isHTMLSpaceButNotLineBreak(UChar character) |
| { |
| return isHTMLSpace(character) && !isHTMLLineBreak(character); |
| } |
| |
| // https://html.spec.whatwg.org/multipage/infrastructure.html#limited-to-only-non-negative-numbers-greater-than-zero |
| inline unsigned limitToOnlyHTMLNonNegativeNumbersGreaterThanZero(unsigned value, unsigned defaultValue = 1) |
| { |
| return (value > 0 && value <= maxHTMLNonNegativeInteger) ? value : defaultValue; |
| } |
| |
| inline unsigned limitToOnlyHTMLNonNegativeNumbersGreaterThanZero(StringView stringValue, unsigned defaultValue = 1) |
| { |
| ASSERT(defaultValue > 0); |
| ASSERT(defaultValue <= maxHTMLNonNegativeInteger); |
| auto optionalValue = parseHTMLNonNegativeInteger(stringValue); |
| unsigned value = optionalValue && optionalValue.value() ? optionalValue.value() : defaultValue; |
| ASSERT(value > 0); |
| ASSERT(value <= maxHTMLNonNegativeInteger); |
| return value; |
| } |
| |
| // https://html.spec.whatwg.org/#reflecting-content-attributes-in-idl-attributes:idl-unsigned-long |
| inline unsigned limitToOnlyHTMLNonNegative(unsigned value, unsigned defaultValue = 0) |
| { |
| ASSERT(defaultValue <= maxHTMLNonNegativeInteger); |
| return value <= maxHTMLNonNegativeInteger ? value : defaultValue; |
| } |
| |
| inline unsigned limitToOnlyHTMLNonNegative(StringView stringValue, unsigned defaultValue = 0) |
| { |
| ASSERT(defaultValue <= maxHTMLNonNegativeInteger); |
| unsigned value = parseHTMLNonNegativeInteger(stringValue).value_or(defaultValue); |
| ASSERT(value <= maxHTMLNonNegativeInteger); |
| return value; |
| } |
| |
| // https://html.spec.whatwg.org/#clamped-to-the-range |
| inline unsigned clampHTMLNonNegativeIntegerToRange(StringView stringValue, unsigned min, unsigned max, unsigned defaultValue = 0) |
| { |
| ASSERT(defaultValue >= min); |
| ASSERT(defaultValue <= max); |
| auto optionalValue = parseHTMLNonNegativeInteger(stringValue); |
| if (optionalValue) |
| return std::min(std::max(optionalValue.value(), min), max); |
| |
| return optionalValue.error() == HTMLIntegerParsingError::PositiveOverflow ? max : defaultValue; |
| } |
| |
| } // namespace WebCore |