bundles/org.simantics.scl.runtime/src/org/simantics/scl/runtime/string/StringEscape.java

   1 package org.simantics.scl.runtime.string;
   2
   3
   4 public class StringEscape {
   5
   6     public static String escapeJava(String str) {
   7         return appendEscapedString(new StringBuilder(str.length()), str).toString();
   8     }
   9
  10     public static StringBuilder appendEscapedString(StringBuilder b, String str) {
  11         int length = str.length();
  12         for(int i = 0; i < length; i++) {
  13             char c = str.charAt(i);
  14             if (c < 32) {
  15                 switch (c) {
  16                 case '\b' :
  17                     b.append('\\');
  18                     b.append('b');
  19                     break;
  20                 case '\n' :
  21                     b.append('\\');
  22                     b.append('n');
  23                     break;
  24                 case '\t' :
  25                     b.append('\\');
  26                     b.append('t');
  27                     break;
  28                 case '\f' :
  29                     b.append('\\');
  30                     b.append('f');
  31                     break;
  32                 case '\r' :
  33                     b.append('\\');
  34                     b.append('r');
  35                     break;
  36                 default :
  37                     if (c > 0xf)
  38                         b.append("\\u00" + Integer.toHexString(c));
  39                     else
  40                         b.append("\\u000" + Integer.toHexString(c));
  41                     break;
  42                 }
  43             }
  44             else {
  45                 switch (c) {
  46                 case '"' :
  47                     b.append('\\').append('"');
  48                     break;
  49                 case '\\' :
  50                     b.append('\\').append('\\');
  51                     break;
  52                 default :
  53                     b.append(c);
  54                     break;
  55                 }
  56             }
  57         }
  58         return b;
  59     }
  60
  61     public static String unescapeJava(String str) {
  62         int length = str.length();
  63         StringBuilder b = new StringBuilder(length*3/2);
  64         for(int i = 0; i < length; i++) {
  65             char c = str.charAt(i);
  66             if(c == '\\') {
  67                 ++i;
  68                 c = str.charAt(i); // if i==length, this throws an exception, which is OK
  69                 switch(c) {
  70                 case 'b': b.append('\b'); break;
  71                 case 't': b.append('\t'); break;
  72                 case 'n': b.append('\n'); break;
  73                 case 'f': b.append('\f'); break;
  74                 case 'r': b.append('\r'); break;
  75                 case 'u':
  76                     b.append((char)Integer.parseInt(str.substring(i+1, i+5), 16));
  77                     i+=4;
  78                     break;
  79                 default:
  80                     if(c >= '0' && c <= '9') {
  81                         b.append(c - '0');
  82                     }
  83                     else
  84                         b.append(c);
  85                 }
  86             }
  87             else
  88                 b.append(c);
  89         }
  90         return b.toString();
  91     }
  92
  93 }