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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 "CSSOMUtils.h"
     33 
     34 #include <wtf/HexNumber.h>
     35 
     36 namespace WebCore {
     37 
     38 static void appendCharacter(UChar32 c, Vector<UChar>& appendTo)
     39 {
     40     if (U16_LENGTH(c) == 1)
     41         appendTo.append(static_cast<UChar>(c));
     42     else {
     43         appendTo.append(U16_LEAD(c));
     44         appendTo.append(U16_TRAIL(c));
     45     }
     46 }
     47 
     48 void serializeCharacter(UChar32 c, Vector<UChar>& appendTo)
     49 {
     50     appendTo.append('\\');
     51     appendCharacter(c, appendTo);
     52 }
     53 
     54 void serializeCharacterAsCodePoint(UChar32 c, Vector<UChar>& appendTo)
     55 {
     56     appendTo.append('\\');
     57     appendUnsignedAsHex(c, appendTo, Lowercase);
     58     appendTo.append(' ');
     59 }
     60 
     61 void serializeIdentifier(const String& identifier, String& appendTo)
     62 {
     63     Vector<UChar> addend;
     64     serializeIdentifier(identifier, addend);
     65     appendTo.append(String::adopt(addend));
     66 }
     67 
     68 void serializeIdentifier(const String& identifier, Vector<UChar>& appendTo)
     69 {
     70     bool isFirst = true;
     71     bool isSecond = false;
     72     bool isFirstCharHyphen = false;
     73     unsigned index = 0;
     74     while (index < identifier.length()) {
     75         UChar32 c = identifier.characterStartingAt(index);
     76         index += U16_LENGTH(c);
     77 
     78         if (c <= 0x1f || (0x30 <= c && c <= 0x39 && (isFirst || (isSecond && isFirstCharHyphen))))
     79             serializeCharacterAsCodePoint(c, appendTo);
     80         else if (c == 0x2d && isSecond && isFirstCharHyphen)
     81             serializeCharacter(c, appendTo);
     82         else if (0x80 <= c || c == 0x2d || c == 0x5f || (0x30 <= c && c <= 0x39) || (0x41 <= c && c <= 0x5a) || (0x61 <= c && c <= 0x7a))
     83             appendCharacter(c, appendTo);
     84         else
     85             serializeCharacter(c, appendTo);
     86 
     87         if (isFirst) {
     88             isFirst = false;
     89             isSecond = true;
     90             isFirstCharHyphen = (c == 0x2d);
     91         } else if (isSecond) {
     92             isSecond = false;
     93         }
     94     }
     95 }
     96 
     97 void serializeString(const String& string, String& appendTo)
     98 {
     99     Vector<UChar> addend;
    100     serializeString(string, addend);
    101     appendTo.append(String::adopt(addend));
    102 }
    103 
    104 void serializeString(const String& string, Vector<UChar>& appendTo)
    105 {
    106     appendTo.append('\"');
    107 
    108     unsigned index = 0;
    109     while (index < string.length()) {
    110         UChar32 c = string.characterStartingAt(index);
    111         index += U16_LENGTH(c);
    112         if (c <= 0x1f)
    113             serializeCharacterAsCodePoint(c, appendTo);
    114         else if (c == 0x22 || c == 0x5c)
    115             serializeCharacter(c, appendTo);
    116         else
    117             appendCharacter(c, appendTo);
    118     }
    119 
    120     appendTo.append('\"');
    121 }
    122 
    123 } // namespace WebCore
    124