185 lines
7.8 KiB
C++
185 lines
7.8 KiB
C++
/*
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* Copyright (C) 2010-2017 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <unicode/uchar.h>
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#include <wtf/Expected.h>
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#include <wtf/text/StringView.h>
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namespace WebCore {
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class Decimal;
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class QualifiedName;
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// Space characters as defined by the HTML specification.
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template<typename CharacterType> bool isHTMLSpace(CharacterType);
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template<typename CharacterType> bool isNotHTMLSpace(CharacterType);
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template<typename CharacterType> bool isComma(CharacterType);
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template<typename CharacterType> bool isHTMLSpaceOrComma(CharacterType);
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bool isHTMLLineBreak(UChar);
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bool isHTMLSpaceButNotLineBreak(UChar);
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// 2147483647 is 2^31 - 1.
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static const unsigned maxHTMLNonNegativeInteger = 2147483647;
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// Strip leading and trailing whitespace as defined by the HTML specification.
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WEBCORE_EXPORT String stripLeadingAndTrailingHTMLSpaces(const String&);
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// An implementation of the HTML specification's algorithm to convert a number to a string for number and range types.
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String serializeForNumberType(const Decimal&);
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String serializeForNumberType(double);
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// Convert the specified string to a decimal/double. If the conversion fails, the return value is fallback value or NaN if not specified.
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// Leading or trailing illegal characters cause failure, as does passing an empty string.
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// The double* parameter may be 0 to check if the string can be parsed without getting the result.
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Decimal parseToDecimalForNumberType(const String&);
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Decimal parseToDecimalForNumberType(const String&, const Decimal& fallbackValue);
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double parseToDoubleForNumberType(const String&);
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double parseToDoubleForNumberType(const String&, double fallbackValue);
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// http://www.whatwg.org/specs/web-apps/current-work/#rules-for-parsing-integers
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enum class HTMLIntegerParsingError { NegativeOverflow, PositiveOverflow, Other };
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WEBCORE_EXPORT Expected<int, HTMLIntegerParsingError> parseHTMLInteger(StringView);
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// http://www.whatwg.org/specs/web-apps/current-work/#rules-for-parsing-non-negative-integers
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WEBCORE_EXPORT Expected<unsigned, HTMLIntegerParsingError> parseHTMLNonNegativeInteger(StringView);
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// https://html.spec.whatwg.org/#valid-non-negative-integer
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std::optional<int> parseValidHTMLNonNegativeInteger(StringView);
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// https://html.spec.whatwg.org/#valid-floating-point-number
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std::optional<double> parseValidHTMLFloatingPointNumber(StringView);
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// https://html.spec.whatwg.org/multipage/infrastructure.html#rules-for-parsing-floating-point-number-values
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Vector<double> parseHTMLListOfOfFloatingPointNumberValues(StringView);
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// https://html.spec.whatwg.org/multipage/semantics.html#attr-meta-http-equiv-refresh
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bool parseMetaHTTPEquivRefresh(const StringView&, double& delay, String& url);
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// https://html.spec.whatwg.org/multipage/infrastructure.html#cors-settings-attribute
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String parseCORSSettingsAttribute(const AtomString&);
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bool threadSafeMatch(const QualifiedName&, const QualifiedName&);
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AtomString parseHTMLHashNameReference(StringView);
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// https://html.spec.whatwg.org/#rules-for-parsing-dimension-values
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struct HTMLDimension {
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enum class Type : bool { Percentage, Pixel };
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double number;
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Type type;
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};
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std::optional<HTMLDimension> parseHTMLDimension(StringView);
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std::optional<HTMLDimension> parseHTMLMultiLength(StringView);
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// Inline implementations of some of the functions declared above.
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template<typename CharacterType> inline bool isHTMLSpace(CharacterType character)
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{
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// Histogram from Apple's page load test combined with some ad hoc browsing some other test suites.
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//
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// 82%: 216330 non-space characters, all > U+0020
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// 11%: 30017 plain space characters, U+0020
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// 5%: 12099 newline characters, U+000A
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// 2%: 5346 tab characters, U+0009
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//
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// No other characters seen. No U+000C or U+000D, and no other control characters.
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// Accordingly, we check for non-spaces first, then space, then newline, then tab, then the other characters.
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return character <= ' ' && (character == ' ' || character == '\n' || character == '\t' || character == '\r' || character == '\f');
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}
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template<typename CharacterType> inline bool isNotHTMLSpace(CharacterType character)
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{
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return !isHTMLSpace(character);
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}
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inline bool isHTMLLineBreak(UChar character)
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{
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return character <= '\r' && (character == '\n' || character == '\r');
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}
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template<typename CharacterType> inline bool isComma(CharacterType character)
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{
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return character == ',';
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}
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template<typename CharacterType> inline bool isHTMLSpaceOrComma(CharacterType character)
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{
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return isComma(character) || isHTMLSpace(character);
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}
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inline bool isHTMLSpaceButNotLineBreak(UChar character)
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{
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return isHTMLSpace(character) && !isHTMLLineBreak(character);
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}
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// https://html.spec.whatwg.org/multipage/infrastructure.html#limited-to-only-non-negative-numbers-greater-than-zero
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inline unsigned limitToOnlyHTMLNonNegativeNumbersGreaterThanZero(unsigned value, unsigned defaultValue = 1)
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{
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return (value > 0 && value <= maxHTMLNonNegativeInteger) ? value : defaultValue;
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}
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inline unsigned limitToOnlyHTMLNonNegativeNumbersGreaterThanZero(StringView stringValue, unsigned defaultValue = 1)
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{
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ASSERT(defaultValue > 0);
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ASSERT(defaultValue <= maxHTMLNonNegativeInteger);
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auto optionalValue = parseHTMLNonNegativeInteger(stringValue);
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unsigned value = optionalValue && optionalValue.value() ? optionalValue.value() : defaultValue;
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ASSERT(value > 0);
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ASSERT(value <= maxHTMLNonNegativeInteger);
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return value;
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}
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// https://html.spec.whatwg.org/#reflecting-content-attributes-in-idl-attributes:idl-unsigned-long
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inline unsigned limitToOnlyHTMLNonNegative(unsigned value, unsigned defaultValue = 0)
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{
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ASSERT(defaultValue <= maxHTMLNonNegativeInteger);
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return value <= maxHTMLNonNegativeInteger ? value : defaultValue;
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}
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inline unsigned limitToOnlyHTMLNonNegative(StringView stringValue, unsigned defaultValue = 0)
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{
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ASSERT(defaultValue <= maxHTMLNonNegativeInteger);
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unsigned value = parseHTMLNonNegativeInteger(stringValue).value_or(defaultValue);
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ASSERT(value <= maxHTMLNonNegativeInteger);
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return value;
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}
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// https://html.spec.whatwg.org/#clamped-to-the-range
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inline unsigned clampHTMLNonNegativeIntegerToRange(StringView stringValue, unsigned min, unsigned max, unsigned defaultValue = 0)
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{
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ASSERT(defaultValue >= min);
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ASSERT(defaultValue <= max);
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auto optionalValue = parseHTMLNonNegativeInteger(stringValue);
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if (optionalValue)
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return std::min(std::max(optionalValue.value(), min), max);
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return optionalValue.error() == HTMLIntegerParsingError::PositiveOverflow ? max : defaultValue;
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}
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} // namespace WebCore
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