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 <wtf/Forward.h>
29 #include <wtf/unicode/Unicode.h>
30
31 namespace WebCore {
32
33 // Space characters as defined by the HTML specification.
34 bool isHTMLSpace(UChar);
35 bool isNotHTMLSpace(UChar);
36
37 // Strip leading and trailing whitespace as defined by the HTML specification.
38 String stripLeadingAndTrailingHTMLSpaces(const String&);
39
40 // An implementation of the HTML specification's algorithm to convert a number to a string for number and range types.
41 String serializeForNumberType(double);
42
43 // Convert the specified string to a double. If the conversion fails, the return value is false.
44 // Leading or trailing illegal characters cause failure, as does passing an empty string.
45 // The double* parameter may be 0 to check if the string can be parsed without getting the result.
46 bool parseToDoubleForNumberType(const String&, double*);
47 bool parseToDoubleForNumberTypeWithDecimalPlaces(const String&, double*, unsigned*);
48
49 // http://www.whatwg.org/specs/web-apps/current-work/#rules-for-parsing-integers
50 bool parseHTMLInteger(const String&, int&);
51
52 // Inline implementations of some of the functions declared above.
53
isHTMLSpace(UChar character)54 inline bool isHTMLSpace(UChar character)
55 {
56 // Histogram from Apple's page load test combined with some ad hoc browsing some other test suites.
57 //
58 // 82%: 216330 non-space characters, all > U+0020
59 // 11%: 30017 plain space characters, U+0020
60 // 5%: 12099 newline characters, U+000A
61 // 2%: 5346 tab characters, U+0009
62 //
63 // No other characters seen. No U+000C or U+000D, and no other control characters.
64 // Accordingly, we check for non-spaces first, then space, then newline, then tab, then the other characters.
65
66 return character <= ' ' && (character == ' ' || character == '\n' || character == '\t' || character == '\r' || character == '\f');
67 }
68
isNotHTMLSpace(UChar character)69 inline bool isNotHTMLSpace(UChar character)
70 {
71 return !isHTMLSpace(character);
72 }
73
74 }
75
76 #endif
77