built against CB 1000

Signed-off-by: locutus <bladedpenguin@gmail.com>

src/org/mcteam/ancientgates/gson/Escaper.java

@@ -0,0 +1,160 @@
+/*
+ * Copyright (C) 2008 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.mcteam.ancientgates.gson;
+
+import java.io.IOException;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * A utility class that is used to perform JSON escaping so that ", <, >, etc. characters are
+ * properly encoded in the JSON string representation before returning to the client code.
+ *
+ * <p>This class contains a single method to escape a passed in string value:
+ * <pre>
+ *   String jsonStringValue = "beforeQuote\"afterQuote";
+ *   String escapedValue = Escaper.escapeJsonString(jsonStringValue);
+ * </pre></p>
+ *
+ * @author Inderjeet Singh
+ * @author Joel Leitch
+ */
+final class Escaper {
+
+  private static final char[] HEX_CHARS = {
+    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
+  };
+
+  private static final Set<Character> JS_ESCAPE_CHARS;
+  private static final Set<Character> HTML_ESCAPE_CHARS;
+
+  static {
+    Set<Character> mandatoryEscapeSet = new HashSet<Character>();
+    mandatoryEscapeSet.add('"');
+    mandatoryEscapeSet.add('\\');
+    JS_ESCAPE_CHARS = Collections.unmodifiableSet(mandatoryEscapeSet);
+
+    Set<Character> htmlEscapeSet = new HashSet<Character>();
+    htmlEscapeSet.add('<');
+    htmlEscapeSet.add('>');
+    htmlEscapeSet.add('&');
+    htmlEscapeSet.add('=');
+    htmlEscapeSet.add('\''); 
+//    htmlEscapeSet.add('/');  -- Removing slash for now since it causes some incompatibilities
+    HTML_ESCAPE_CHARS = Collections.unmodifiableSet(htmlEscapeSet);
+  }
+
+  private final boolean escapeHtmlCharacters;
+  
+  Escaper(boolean escapeHtmlCharacters) {
+    this.escapeHtmlCharacters = escapeHtmlCharacters;
+  }
+  
+  public String escapeJsonString(CharSequence plainText) {
+    StringBuffer escapedString = new StringBuffer(plainText.length() + 20);
+    try {
+      escapeJsonString(plainText, escapedString);
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+    return escapedString.toString();
+  }
+
+  private void escapeJsonString(CharSequence plainText, StringBuffer out) throws IOException {
+    int pos = 0;  // Index just past the last char in plainText written to out.
+    int len = plainText.length();
+    
+    for (int charCount, i = 0; i < len; i += charCount) {
+      int codePoint = Character.codePointAt(plainText, i);
+      charCount = Character.charCount(codePoint);
+      
+       if (!isControlCharacter(codePoint) && !mustEscapeCharInJsString(codePoint)) {
+          continue;
+       }
+
+       out.append(plainText, pos, i);
+       pos = i + charCount;
+       switch (codePoint) {
+         case '\b':
+           out.append("\\b");
+           break;
+         case '\t':
+           out.append("\\t");
+           break;
+         case '\n':
+           out.append("\\n");
+           break;
+         case '\f':
+           out.append("\\f");
+           break;
+         case '\r':
+           out.append("\\r");
+           break;
+         case '\\':
+           out.append("\\\\");
+           break;
+         case '/':
+           out.append("\\/");
+           break;
+         case '"':
+           out.append("\\\"");
+           break;
+         default:
+           appendHexJavaScriptRepresentation(codePoint, out);
+           break;
+       }
+     }
+     out.append(plainText, pos, len);
+  }
+  
+  private boolean mustEscapeCharInJsString(int codepoint) {
+    if (!Character.isSupplementaryCodePoint(codepoint)) {
+      char c = (char) codepoint;
+      return JS_ESCAPE_CHARS.contains(c)
+          || (escapeHtmlCharacters && HTML_ESCAPE_CHARS.contains(c));
+    }
+    return false;
+  }
+
+  private static boolean isControlCharacter(int codePoint) {
+    // JSON spec defines these code points as control characters, so they must be escaped
+    return codePoint < 0x20
+        || codePoint == 0x2028  // Line separator
+        || codePoint == 0x2029  // Paragraph separator
+        || (codePoint >= 0x7f && codePoint <= 0x9f);
+  }
+
+  private static void appendHexJavaScriptRepresentation(int codePoint, Appendable out)
+      throws IOException {
+    if (Character.isSupplementaryCodePoint(codePoint)) {
+      // Handle supplementary unicode values which are not representable in
+      // javascript.  We deal with these by escaping them as two 4B sequences
+      // so that they will round-trip properly when sent from java to javascript
+      // and back.
+      char[] surrogates = Character.toChars(codePoint);
+      appendHexJavaScriptRepresentation(surrogates[0], out);
+      appendHexJavaScriptRepresentation(surrogates[1], out);
+      return;
+    }
+    out.append("\\u")
+        .append(HEX_CHARS[(codePoint >>> 12) & 0xf])
+        .append(HEX_CHARS[(codePoint >>> 8) & 0xf])
+        .append(HEX_CHARS[(codePoint >>> 4) & 0xf])
+        .append(HEX_CHARS[codePoint & 0xf]);
+  }
+}