1 /* 2 * Copyright (C) 2010 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY 17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 */ 24 25 #ifndef HTMLParserIdioms_h 26 #define HTMLParserIdioms_h 27 28 #include "core/dom/QualifiedName.h" 29 #include "platform/Decimal.h" 30 #include "wtf/Forward.h" 31 #include "wtf/text/WTFString.h" 32 33 namespace WTF { 34 class TextEncoding; 35 } 36 37 namespace WebCore { 38 39 // Strip leading and trailing whitespace as defined by the HTML specification. 40 String stripLeadingAndTrailingHTMLSpaces(const String&); 41 template<size_t inlineCapacity> 42 String stripLeadingAndTrailingHTMLSpaces(const Vector<UChar, inlineCapacity>& vector) 43 { 44 return stripLeadingAndTrailingHTMLSpaces(StringImpl::create8BitIfPossible(vector)); 45 } 46 47 // An implementation of the HTML specification's algorithm to convert a number to a string for number and range types. 48 String serializeForNumberType(const Decimal&); 49 String serializeForNumberType(double); 50 51 // Convert the specified string to a decimal/double. If the conversion fails, the return value is fallback value or NaN if not specified. 52 // Leading or trailing illegal characters cause failure, as does passing an empty string. 53 // The double* parameter may be 0 to check if the string can be parsed without getting the result. 54 Decimal parseToDecimalForNumberType(const String&, const Decimal& fallbackValue = Decimal::nan()); 55 double parseToDoubleForNumberType(const String&, double fallbackValue = std::numeric_limits<double>::quiet_NaN()); 56 57 // http://www.whatwg.org/specs/web-apps/current-work/#rules-for-parsing-integers 58 bool parseHTMLInteger(const String&, int&); 59 60 // http://www.whatwg.org/specs/web-apps/current-work/#rules-for-parsing-non-negative-integers 61 bool parseHTMLNonNegativeInteger(const String&, unsigned&); 62 63 typedef Vector<pair<String, String> > HTMLAttributeList; 64 // The returned encoding might not be valid. 65 WTF::TextEncoding encodingFromMetaAttributes(const HTMLAttributeList&); 66 67 // Space characters as defined by the HTML specification. 68 template<typename CharType> 69 inline bool isHTMLSpace(CharType character) 70 { 71 // Histogram from Apple's page load test combined with some ad hoc browsing some other test suites. 72 // 73 // 82%: 216330 non-space characters, all > U+0020 74 // 11%: 30017 plain space characters, U+0020 75 // 5%: 12099 newline characters, U+000A 76 // 2%: 5346 tab characters, U+0009 77 // 78 // No other characters seen. No U+000C or U+000D, and no other control characters. 79 // Accordingly, we check for non-spaces first, then space, then newline, then tab, then the other characters. 80 81 return character <= ' ' && (character == ' ' || character == '\n' || character == '\t' || character == '\r' || character == '\f'); 82 } 83 84 template<typename CharType> 85 inline bool isComma(CharType character) 86 { 87 return character == ','; 88 } 89 90 template<typename CharType> 91 inline bool isHTMLSpaceOrComma(CharType character) 92 { 93 return isComma(character) || isHTMLSpace(character); 94 } 95 96 inline bool isHTMLLineBreak(UChar character) 97 { 98 return character <= '\r' && (character == '\n' || character == '\r'); 99 } 100 101 template<typename CharType> 102 inline bool isNotHTMLSpace(CharType character) 103 { 104 return !isHTMLSpace<CharType>(character); 105 } 106 107 bool threadSafeMatch(const QualifiedName&, const QualifiedName&); 108 bool threadSafeMatch(const String&, const QualifiedName&); 109 110 enum CharacterWidth { 111 Likely8Bit, 112 Force8Bit, 113 Force16Bit 114 }; 115 116 String attemptStaticStringCreation(const LChar*, size_t); 117 118 String attemptStaticStringCreation(const UChar*, size_t, CharacterWidth); 119 120 template<size_t inlineCapacity> 121 inline static String attemptStaticStringCreation(const Vector<UChar, inlineCapacity>& vector, CharacterWidth width) 122 { 123 return attemptStaticStringCreation(vector.data(), vector.size(), width); 124 } 125 126 inline static String attemptStaticStringCreation(const String str) 127 { 128 if (!str.is8Bit()) 129 return attemptStaticStringCreation(str.characters16(), str.length(), Force16Bit); 130 return attemptStaticStringCreation(str.characters8(), str.length()); 131 } 132 133 134 } 135 #endif 136