| /* |
| * Copyright 2009 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 com.google.gwt.core.client; |
| |
| /** |
| * Provides JSON-related utility methods. |
| */ |
| public class JsonUtils { |
| @SuppressWarnings("unused") |
| private static JavaScriptObject escapeTable = initEscapeTable(); |
| |
| /** |
| * Returns a quoted, escaped JSON String. |
| */ |
| public static native String escapeValue(String toEscape) /*-{ |
| var s = toEscape.replace(/[\x00-\x1F\u2028\u2029"\\]/g, function(x) { |
| return @com.google.gwt.core.client.JsonUtils::escapeChar(Ljava/lang/String;)(x); |
| }); |
| return "\"" + s + "\""; |
| }-*/; |
| |
| /* |
| * TODO: Implement safeEval using a proper parser. |
| */ |
| |
| /** |
| * Evaluates a JSON expression. This method does not validate the JSON text |
| * and should only be used on JSON from trusted sources. |
| * |
| * @param <T> The type of JavaScriptObject that should be returned |
| * @param json The source JSON text |
| * @return The evaluated object |
| */ |
| public static native <T extends JavaScriptObject> T unsafeEval(String json) /*-{ |
| return eval('(' + json + ')'); |
| }-*/; |
| |
| @SuppressWarnings("unused") |
| private static native String escapeChar(String c) /*-{ |
| var lookedUp = @com.google.gwt.core.client.JsonUtils::escapeTable[c.charCodeAt(0)]; |
| return (lookedUp == null) ? c : lookedUp; |
| }-*/; |
| |
| private static native JavaScriptObject initEscapeTable() /*-{ |
| var out = [ |
| "\\u0000", "\\u0001", "\\u0002", "\\u0003", "\\u0004", "\\u0005", |
| "\\u0006", "\\u0007", "\\b", "\\t", "\\n", "\\u000B", |
| "\\f", "\\r", "\\u000E", "\\u000F", "\\u0010", "\\u0011", |
| "\\u0012", "\\u0013", "\\u0014", "\\u0015", "\\u0016", "\\u0017", |
| "\\u0018", "\\u0019", "\\u001A", "\\u001B", "\\u001C", "\\u001D", |
| "\\u001E", "\\u001F"]; |
| out[34] = '\\"'; |
| out[92] = '\\\\'; |
| |
| // Unicode line separator chars |
| out[0x2028] = '\\u2028'; |
| out[0x2029] = '\\u2029'; |
| return out; |
| }-*/; |
| |
| private JsonUtils() { |
| } |
| } |