4 Copyright (c) 2002 JSON.org
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16 The Software shall be used for Good, not Evil.
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,
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28 * This provides static methods to convert comma delimited text into a
29 * JSONArray, and to convert 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.
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.
38 * The first row usually contains the names of the columns.
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
49 * Get the next value. The value can be wrapped in quotes. The value can
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.
55 private static String getValue(JSONTokener x) throws JSONException {
61 } while (c == ' ' || c == '\t');
68 sb = new StringBuffer();
72 //Handle escaped double-quote
73 char nextC = x.next();
75 // if our quote was the end of the file, don't step
82 if (c == 0 || c == '\n' || c == '\r') {
83 throw x.syntaxError("Missing close quote '" + q + "'.");
98 * Produce a JSONArray of strings from a row of comma delimited values.
99 * @param x A JSONTokener of the source text.
100 * @return A JSONArray of strings.
101 * @throws JSONException
103 public static JSONArray rowToJSONArray(JSONTokener x) throws JSONException {
104 JSONArray ja = new JSONArray();
106 String value = getValue(x);
109 (ja.length() == 0 && value.length() == 0 && c != ',')) {
118 if (c == '\n' || c == '\r' || c == 0) {
121 throw x.syntaxError("Bad character '" + c + "' (" +
130 * Produce a JSONObject from a row of comma delimited text, using a
131 * parallel JSONArray of strings to provides the names of the elements.
132 * @param names A JSONArray of names. This is commonly obtained from the
133 * first row of a comma delimited text file using the rowToJSONArray
135 * @param x A JSONTokener of the source text.
136 * @return A JSONObject combining the names and values.
137 * @throws JSONException
139 public static JSONObject rowToJSONObject(JSONArray names, JSONTokener x)
140 throws JSONException {
141 JSONArray ja = rowToJSONArray(x);
142 return ja != null ? ja.toJSONObject(names) : null;
146 * Produce a comma delimited text row from a JSONArray. Values containing
147 * the comma character will be quoted. Troublesome characters may be
149 * @param ja A JSONArray of strings.
150 * @return A string ending in NEWLINE.
152 public static String rowToString(JSONArray ja) {
153 StringBuilder sb = new StringBuilder();
154 for (int i = 0; i < ja.length(); i += 1) {
158 Object object = ja.opt(i);
159 if (object != null) {
160 String string = object.toString();
161 if (string.length() > 0 && (string.indexOf(',') >= 0 ||
162 string.indexOf('\n') >= 0 || string.indexOf('\r') >= 0 ||
163 string.indexOf(0) >= 0 || string.charAt(0) == '"')) {
165 int length = string.length();
166 for (int j = 0; j < length; j += 1) {
167 char c = string.charAt(j);
168 if (c >= ' ' && c != '"') {
179 return sb.toString();
183 * Produce a JSONArray of JSONObjects from a comma delimited text string,
184 * using the first row as a source of names.
185 * @param string The comma delimited text.
186 * @return A JSONArray of JSONObjects.
187 * @throws JSONException
189 public static JSONArray toJSONArray(String string) throws JSONException {
190 return toJSONArray(new JSONTokener(string));
194 * Produce a JSONArray of JSONObjects from a comma delimited text string,
195 * using the first row as a source of names.
196 * @param x The JSONTokener containing the comma delimited text.
197 * @return A JSONArray of JSONObjects.
198 * @throws JSONException
200 public static JSONArray toJSONArray(JSONTokener x) throws JSONException {
201 return toJSONArray(rowToJSONArray(x), x);
205 * Produce a JSONArray of JSONObjects from a comma delimited text string
206 * using a supplied JSONArray as the source of element names.
207 * @param names A JSONArray of strings.
208 * @param string The comma delimited text.
209 * @return A JSONArray of JSONObjects.
210 * @throws JSONException
212 public static JSONArray toJSONArray(JSONArray names, String string)
213 throws JSONException {
214 return toJSONArray(names, new JSONTokener(string));
218 * Produce a JSONArray of JSONObjects from a comma delimited text string
219 * using a supplied JSONArray as the source of element names.
220 * @param names A JSONArray of strings.
221 * @param x A JSONTokener of the source text.
222 * @return A JSONArray of JSONObjects.
223 * @throws JSONException
225 public static JSONArray toJSONArray(JSONArray names, JSONTokener x)
226 throws JSONException {
227 if (names == null || names.length() == 0) {
230 JSONArray ja = new JSONArray();
232 JSONObject jo = rowToJSONObject(names, x);
238 if (ja.length() == 0) {
246 * Produce a comma delimited text from a JSONArray of JSONObjects. The
247 * first row will be a list of names obtained by inspecting the first
249 * @param ja A JSONArray of JSONObjects.
250 * @return A comma delimited text.
251 * @throws JSONException
253 public static String toString(JSONArray ja) throws JSONException {
254 JSONObject jo = ja.optJSONObject(0);
256 JSONArray names = jo.names();
258 return rowToString(names) + toString(names, ja);
265 * Produce a comma delimited text from a JSONArray of JSONObjects using
266 * a provided list of names. The list of names is not included in the
268 * @param names A JSONArray of strings.
269 * @param ja A JSONArray of JSONObjects.
270 * @return A comma delimited text.
271 * @throws JSONException
273 public static String toString(JSONArray names, JSONArray ja)
274 throws JSONException {
275 if (names == null || names.length() == 0) {
278 StringBuffer sb = new StringBuffer();
279 for (int i = 0; i < ja.length(); i += 1) {
280 JSONObject jo = ja.optJSONObject(i);
282 sb.append(rowToString(jo.toJSONArray(names)));
285 return sb.toString();