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
31namespace WebCore {
32
33// Space characters as defined by the HTML specification.
34bool isHTMLSpace(UChar);
35bool isNotHTMLSpace(UChar);
36
37// Strip leading and trailing whitespace as defined by the HTML specification.
38String 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.
41String 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.
46bool parseToDoubleForNumberType(const String&, double*);
47bool parseToDoubleForNumberTypeWithDecimalPlaces(const String&, double*, unsigned*);
48
49// http://www.whatwg.org/specs/web-apps/current-work/#rules-for-parsing-integers
50bool parseHTMLInteger(const String&, int&);
51
52// Inline implementations of some of the functions declared above.
53
54inline 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
69inline bool isNotHTMLSpace(UChar character)
70{
71    return !isHTMLSpace(character);
72}
73
74}
75
76#endif
77