1 package com.google.polo.json; 2 3 /* 4 Copyright (c) 2002 JSON.org 5 6 Permission is hereby granted, free of charge, to any person obtaining a copy 7 of this software and associated documentation files (the "Software"), to deal 8 in the Software without restriction, including without limitation the rights 9 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 copies of the Software, and to permit persons to whom the Software is 11 furnished to do so, subject to the following conditions: 12 13 The above copyright notice and this permission notice shall be included in all 14 copies or substantial portions of the Software. 15 16 The Software shall be used for Good, not Evil. 17 18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 21 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 22 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 23 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 24 SOFTWARE. 25 */ 26 27 /** 28 * This provides static methods to convert comma delimited text into a 29 * JSONArray, and to covert a JSONArray into comma delimited text. Comma 30 * delimited text is a very popular format for data interchange. It is 31 * understood by most database, spreadsheet, and organizer programs. 32 * <p> 33 * Each row of text represents a row in a table or a data record. Each row 34 * ends with a NEWLINE character. Each row contains one or more values. 35 * Values are separated by commas. A value can contain any character except 36 * for comma, unless is is wrapped in single quotes or double quotes. 37 * <p> 38 * The first row usually contains the names of the columns. 39 * <p> 40 * A comma delimited list can be converted into a JSONArray of JSONObjects. 41 * The names for the elements in the JSONObjects can be taken from the names 42 * in the first row. 43 * @author JSON.org 44 * @version 2008-09-18 45 */ 46 public class CDL { 47 48 /** 49 * Get the next value. The value can be wrapped in quotes. The value can 50 * be empty. 51 * @param x A JSONTokener of the source text. 52 * @return The value string, or null if empty. 53 * @throws JSONException if the quoted string is badly formed. 54 */ 55 private static String getValue(JSONTokener x) throws JSONException { 56 char c; 57 do { 58 c = x.next(); 59 } while (c == ' ' || c == '\t'); 60 switch (c) { 61 case 0: 62 return null; 63 case '"': 64 case '\'': 65 return x.nextString(c); 66 case ',': 67 x.back(); 68 return ""; 69 default: 70 x.back(); 71 return x.nextTo(','); 72 } 73 } 74 75 /** 76 * Produce a JSONArray of strings from a row of comma delimited values. 77 * @param x A JSONTokener of the source text. 78 * @return A JSONArray of strings. 79 * @throws JSONException 80 */ 81 public static JSONArray rowToJSONArray(JSONTokener x) throws JSONException { 82 JSONArray ja = new JSONArray(); 83 for (;;) { 84 String value = getValue(x); 85 if (value == null || (ja.length() == 0 && value.length() == 0)) { 86 return null; 87 } 88 ja.put(value); 89 for (;;) { 90 char c = x.next(); 91 if (c == ',') { 92 break; 93 } 94 if (c != ' ') { 95 if (c == '\n' || c == '\r' || c == 0) { 96 return ja; 97 } 98 throw x.syntaxError("Bad character '" + c + "' (" + 99 (int)c + ")."); 100 } 101 } 102 } 103 } 104 105 /** 106 * Produce a JSONObject from a row of comma delimited text, using a 107 * parallel JSONArray of strings to provides the names of the elements. 108 * @param names A JSONArray of names. This is commonly obtained from the 109 * first row of a comma delimited text file using the rowToJSONArray 110 * method. 111 * @param x A JSONTokener of the source text. 112 * @return A JSONObject combining the names and values. 113 * @throws JSONException 114 */ 115 public static JSONObject rowToJSONObject(JSONArray names, JSONTokener x) 116 throws JSONException { 117 JSONArray ja = rowToJSONArray(x); 118 return ja != null ? ja.toJSONObject(names) : null; 119 } 120 121 /** 122 * Produce a JSONArray of JSONObjects from a comma delimited text string, 123 * using the first row as a source of names. 124 * @param string The comma delimited text. 125 * @return A JSONArray of JSONObjects. 126 * @throws JSONException 127 */ 128 public static JSONArray toJSONArray(String string) throws JSONException { 129 return toJSONArray(new JSONTokener(string)); 130 } 131 132 /** 133 * Produce a JSONArray of JSONObjects from a comma delimited text string, 134 * using the first row as a source of names. 135 * @param x The JSONTokener containing the comma delimited text. 136 * @return A JSONArray of JSONObjects. 137 * @throws JSONException 138 */ 139 public static JSONArray toJSONArray(JSONTokener x) throws JSONException { 140 return toJSONArray(rowToJSONArray(x), x); 141 } 142 143 /** 144 * Produce a JSONArray of JSONObjects from a comma delimited text string 145 * using a supplied JSONArray as the source of element names. 146 * @param names A JSONArray of strings. 147 * @param string The comma delimited text. 148 * @return A JSONArray of JSONObjects. 149 * @throws JSONException 150 */ 151 public static JSONArray toJSONArray(JSONArray names, String string) 152 throws JSONException { 153 return toJSONArray(names, new JSONTokener(string)); 154 } 155 156 /** 157 * Produce a JSONArray of JSONObjects from a comma delimited text string 158 * using a supplied JSONArray as the source of element names. 159 * @param names A JSONArray of strings. 160 * @param x A JSONTokener of the source text. 161 * @return A JSONArray of JSONObjects. 162 * @throws JSONException 163 */ 164 public static JSONArray toJSONArray(JSONArray names, JSONTokener x) 165 throws JSONException { 166 if (names == null || names.length() == 0) { 167 return null; 168 } 169 JSONArray ja = new JSONArray(); 170 for (;;) { 171 JSONObject jo = rowToJSONObject(names, x); 172 if (jo == null) { 173 break; 174 } 175 ja.put(jo); 176 } 177 if (ja.length() == 0) { 178 return null; 179 } 180 return ja; 181 } 182 183 184 /** 185 * Produce a comma delimited text row from a JSONArray. Values containing 186 * the comma character will be quoted. 187 * @param ja A JSONArray of strings. 188 * @return A string ending in NEWLINE. 189 */ 190 public static String rowToString(JSONArray ja) { 191 StringBuffer sb = new StringBuffer(); 192 for (int i = 0; i < ja.length(); i += 1) { 193 if (i > 0) { 194 sb.append(','); 195 } 196 Object o = ja.opt(i); 197 if (o != null) { 198 String s = o.toString(); 199 if (s.indexOf(',') >= 0) { 200 if (s.indexOf('"') >= 0) { 201 sb.append('\''); 202 sb.append(s); 203 sb.append('\''); 204 } else { 205 sb.append('"'); 206 sb.append(s); 207 sb.append('"'); 208 } 209 } else { 210 sb.append(s); 211 } 212 } 213 } 214 sb.append('\n'); 215 return sb.toString(); 216 217 } 218 219 /** 220 * Produce a comma delimited text from a JSONArray of JSONObjects. The 221 * first row will be a list of names obtained by inspecting the first 222 * JSONObject. 223 * @param ja A JSONArray of JSONObjects. 224 * @return A comma delimited text. 225 * @throws JSONException 226 */ 227 public static String toString(JSONArray ja) throws JSONException { 228 JSONObject jo = ja.optJSONObject(0); 229 if (jo != null) { 230 JSONArray names = jo.names(); 231 if (names != null) { 232 return rowToString(names) + toString(names, ja); 233 } 234 } 235 return null; 236 } 237 238 /** 239 * Produce a comma delimited text from a JSONArray of JSONObjects using 240 * a provided list of names. The list of names is not included in the 241 * output. 242 * @param names A JSONArray of strings. 243 * @param ja A JSONArray of JSONObjects. 244 * @return A comma delimited text. 245 * @throws JSONException 246 */ 247 public static String toString(JSONArray names, JSONArray ja) 248 throws JSONException { 249 if (names == null || names.length() == 0) { 250 return null; 251 } 252 StringBuffer sb = new StringBuffer(); 253 for (int i = 0; i < ja.length(); i += 1) { 254 JSONObject jo = ja.optJSONObject(i); 255 if (jo != null) { 256 sb.append(rowToString(jo.toJSONArray(names))); 257 } 258 } 259 return sb.toString(); 260 } 261 } 262
