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/*
* Copyright (C) 2010 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/Forward.h>
#include <wtf/Optional.h>
#include <wtf/Vector.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 isComma(CharacterType);
template<typename CharacterType> bool isHTMLSpaceOrComma(CharacterType);
bool isHTMLLineBreak(UChar);
bool isNotHTMLSpace(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(const String&);
Decimal parseToDecimalForNumberType(const String&, const Decimal& fallbackValue);
double parseToDoubleForNumberType(const String&);
double parseToDoubleForNumberType(const String&, double fallbackValue);
// http://www.whatwg.org/specs/web-apps/current-work/#rules-for-parsing-integers
WEBCORE_EXPORT std::optional<int> parseHTMLInteger(StringView);
// http://www.whatwg.org/specs/web-apps/current-work/#rules-for-parsing-non-negative-integers
WEBCORE_EXPORT std::optional<unsigned> 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(const StringView&, double& delay, String& url);
// https://html.spec.whatwg.org/multipage/infrastructure.html#cors-settings-attribute
String parseCORSSettingsAttribute(const AtomicString&);
bool threadSafeMatch(const QualifiedName&, const QualifiedName&);
AtomicString parseHTMLHashNameReference(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');
}
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 isNotHTMLSpace(UChar character)
{
return !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;
}
} // namespace WebCore
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