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25 #ifndef HTMLParserIdioms_h
26 #define HTMLParserIdioms_h
28 #include <wtf/Forward.h>
29 #include <wtf/unicode/Unicode.h>
33 // Space characters as defined by the HTML specification.
34 bool isHTMLSpace(UChar);
35 bool isHTMLLineBreak(UChar);
36 bool isNotHTMLSpace(UChar);
38 // Strip leading and trailing whitespace as defined by the HTML specification.
39 String stripLeadingAndTrailingHTMLSpaces(const String&);
41 // An implementation of the HTML specification's algorithm to convert a number to a string for number and range types.
42 String serializeForNumberType(double);
44 // Convert the specified string to a double. If the conversion fails, the return value is false.
45 // Leading or trailing illegal characters cause failure, as does passing an empty string.
46 // The double* parameter may be 0 to check if the string can be parsed without getting the result.
47 bool parseToDoubleForNumberType(const String&, double*);
48 bool parseToDoubleForNumberTypeWithDecimalPlaces(const String&, double*, unsigned*);
50 // http://www.whatwg.org/specs/web-apps/current-work/#rules-for-parsing-integers
51 bool parseHTMLInteger(const String&, int&);
53 // http://www.whatwg.org/specs/web-apps/current-work/#rules-for-parsing-non-negative-integers
54 bool parseHTMLNonNegativeInteger(const String&, unsigned int&);
56 // Inline implementations of some of the functions declared above.
58 inline bool isHTMLSpace(UChar character)
60 // Histogram from Apple's page load test combined with some ad hoc browsing some other test suites.
62 // 82%: 216330 non-space characters, all > U+0020
63 // 11%: 30017 plain space characters, U+0020
64 // 5%: 12099 newline characters, U+000A
65 // 2%: 5346 tab characters, U+0009
67 // No other characters seen. No U+000C or U+000D, and no other control characters.
68 // Accordingly, we check for non-spaces first, then space, then newline, then tab, then the other characters.
70 return character <= ' ' && (character == ' ' || character == '\n' || character == '\t' || character == '\r' || character == '\f');
73 inline bool isHTMLLineBreak(UChar character)
75 return character <= '\r' && (character == '\n' || character == '\r');
78 inline bool isNotHTMLSpace(UChar character)
80 return !isHTMLSpace(character);