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      1 /*
      2  * Copyright (c) 2010 Google 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 are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "core/css/CSSOMUtils.h"
     33 
     34 #include "wtf/HexNumber.h"
     35 #include "wtf/text/StringBuilder.h"
     36 
     37 namespace WebCore {
     38 
     39 void serializeCharacter(UChar32 c, StringBuilder& appendTo)
     40 {
     41     appendTo.append('\\');
     42     appendTo.append(c);
     43 }
     44 
     45 void serializeCharacterAsCodePoint(UChar32 c, StringBuilder& appendTo)
     46 {
     47     appendTo.append('\\');
     48     appendUnsignedAsHex(c, appendTo, Lowercase);
     49     appendTo.append(' ');
     50 }
     51 
     52 void serializeIdentifier(const String& identifier, String& appendTo)
     53 {
     54     StringBuilder addend;
     55     serializeIdentifier(identifier, addend);
     56     appendTo.append(addend.toString());
     57 }
     58 
     59 void serializeIdentifier(const String& identifier, StringBuilder& appendTo)
     60 {
     61     bool isFirst = true;
     62     bool isSecond = false;
     63     bool isFirstCharHyphen = false;
     64     unsigned index = 0;
     65     while (index < identifier.length()) {
     66         UChar32 c = identifier.characterStartingAt(index);
     67         index += U16_LENGTH(c);
     68 
     69         if (c <= 0x1f || (0x30 <= c && c <= 0x39 && (isFirst || (isSecond && isFirstCharHyphen))))
     70             serializeCharacterAsCodePoint(c, appendTo);
     71         else if (c == 0x2d && isSecond && isFirstCharHyphen)
     72             serializeCharacter(c, appendTo);
     73         else if (0x80 <= c || c == 0x2d || c == 0x5f || (0x30 <= c && c <= 0x39) || (0x41 <= c && c <= 0x5a) || (0x61 <= c && c <= 0x7a))
     74             appendTo.append(c);
     75         else
     76             serializeCharacter(c, appendTo);
     77 
     78         if (isFirst) {
     79             isFirst = false;
     80             isSecond = true;
     81             isFirstCharHyphen = (c == 0x2d);
     82         } else if (isSecond) {
     83             isSecond = false;
     84         }
     85     }
     86 }
     87 
     88 void serializeString(const String& string, String& appendTo)
     89 {
     90     StringBuilder addend;
     91     serializeString(string, addend);
     92     appendTo.append(addend.toString());
     93 }
     94 
     95 void serializeString(const String& string, StringBuilder& appendTo)
     96 {
     97     appendTo.append('\"');
     98 
     99     unsigned index = 0;
    100     while (index < string.length()) {
    101         UChar32 c = string.characterStartingAt(index);
    102         index += U16_LENGTH(c);
    103         if (c <= 0x1f)
    104             serializeCharacterAsCodePoint(c, appendTo);
    105         else if (c == 0x22 || c == 0x5c)
    106             serializeCharacter(c, appendTo);
    107         else
    108             appendTo.append(c);
    109     }
    110 
    111     appendTo.append('\"');
    112 }
    113 
    114 } // namespace WebCore
    115