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[semainetech_django.git] / project / media / django / js / dateparse.js
1 /* 'Magic' date parsing, by Simon Willison (6th October 2003)
2 http://simon.incutio.com/archive/2003/10/06/betterDateInput
3 Adapted for 6newslawrence.com, 28th January 2004
4 */
5
6 /* Finds the index of the first occurence of item in the array, or -1 if not found */
7 if (typeof Array.prototype.indexOf == 'undefined') {
8 Array.prototype.indexOf = function(item) {
9 var len = this.length;
10 for (var i = 0; i < len; i++) {
11 if (this[i] == item) {
12 return i;
13 }
14 }
15 return -1;
16 };
17 }
18 /* Returns an array of items judged 'true' by the passed in test function */
19 if (typeof Array.prototype.filter == 'undefined') {
20 Array.prototype.filter = function(test) {
21 var matches = [];
22 var len = this.length;
23 for (var i = 0; i < len; i++) {
24 if (test(this[i])) {
25 matches[matches.length] = this[i];
26 }
27 }
28 return matches;
29 };
30 }
31
32 var monthNames = gettext("January February March April May June July August September October November December").split(" ");
33 var weekdayNames = gettext("Sunday Monday Tuesday Wednesday Thursday Friday Saturday").split(" ");
34
35 /* Takes a string, returns the index of the month matching that string, throws
36 an error if 0 or more than 1 matches
37 */
38 function parseMonth(month) {
39 var matches = monthNames.filter(function(item) {
40 return new RegExp("^" + month, "i").test(item);
41 });
42 if (matches.length == 0) {
43 throw new Error("Invalid month string");
44 }
45 if (matches.length > 1) {
46 throw new Error("Ambiguous month");
47 }
48 return monthNames.indexOf(matches[0]);
49 }
50 /* Same as parseMonth but for days of the week */
51 function parseWeekday(weekday) {
52 var matches = weekdayNames.filter(function(item) {
53 return new RegExp("^" + weekday, "i").test(item);
54 });
55 if (matches.length == 0) {
56 throw new Error("Invalid day string");
57 }
58 if (matches.length > 1) {
59 throw new Error("Ambiguous weekday");
60 }
61 return weekdayNames.indexOf(matches[0]);
62 }
63
64 /* Array of objects, each has 're', a regular expression and 'handler', a
65 function for creating a date from something that matches the regular
66 expression. Handlers may throw errors if string is unparseable.
67 */
68 var dateParsePatterns = [
69 // Today
70 { re: /^tod/i,
71 handler: function() {
72 return new Date();
73 }
74 },
75 // Tomorrow
76 { re: /^tom/i,
77 handler: function() {
78 var d = new Date();
79 d.setDate(d.getDate() + 1);
80 return d;
81 }
82 },
83 // Yesterday
84 { re: /^yes/i,
85 handler: function() {
86 var d = new Date();
87 d.setDate(d.getDate() - 1);
88 return d;
89 }
90 },
91 // 4th
92 { re: /^(\d{1,2})(st|nd|rd|th)?$/i,
93 handler: function(bits) {
94 var d = new Date();
95 d.setDate(parseInt(bits[1], 10));
96 return d;
97 }
98 },
99 // 4th Jan
100 { re: /^(\d{1,2})(?:st|nd|rd|th)? (\w+)$/i,
101 handler: function(bits) {
102 var d = new Date();
103 d.setDate(parseInt(bits[1], 10));
104 d.setMonth(parseMonth(bits[2]));
105 return d;
106 }
107 },
108 // 4th Jan 2003
109 { re: /^(\d{1,2})(?:st|nd|rd|th)? (\w+),? (\d{4})$/i,
110 handler: function(bits) {
111 var d = new Date();
112 d.setDate(parseInt(bits[1], 10));
113 d.setMonth(parseMonth(bits[2]));
114 d.setYear(bits[3]);
115 return d;
116 }
117 },
118 // Jan 4th
119 { re: /^(\w+) (\d{1,2})(?:st|nd|rd|th)?$/i,
120 handler: function(bits) {
121 var d = new Date();
122 d.setDate(parseInt(bits[2], 10));
123 d.setMonth(parseMonth(bits[1]));
124 return d;
125 }
126 },
127 // Jan 4th 2003
128 { re: /^(\w+) (\d{1,2})(?:st|nd|rd|th)?,? (\d{4})$/i,
129 handler: function(bits) {
130 var d = new Date();
131 d.setDate(parseInt(bits[2], 10));
132 d.setMonth(parseMonth(bits[1]));
133 d.setYear(bits[3]);
134 return d;
135 }
136 },
137 // next Tuesday - this is suspect due to weird meaning of "next"
138 { re: /^next (\w+)$/i,
139 handler: function(bits) {
140 var d = new Date();
141 var day = d.getDay();
142 var newDay = parseWeekday(bits[1]);
143 var addDays = newDay - day;
144 if (newDay <= day) {
145 addDays += 7;
146 }
147 d.setDate(d.getDate() + addDays);
148 return d;
149 }
150 },
151 // last Tuesday
152 { re: /^last (\w+)$/i,
153 handler: function(bits) {
154 throw new Error("Not yet implemented");
155 }
156 },
157 // mm/dd/yyyy (American style)
158 { re: /(\d{1,2})\/(\d{1,2})\/(\d{4})/,
159 handler: function(bits) {
160 var d = new Date();
161 d.setYear(bits[3]);
162 d.setDate(parseInt(bits[2], 10));
163 d.setMonth(parseInt(bits[1], 10) - 1); // Because months indexed from 0
164 return d;
165 }
166 },
167 // yyyy-mm-dd (ISO style)
168 { re: /(\d{4})-(\d{1,2})-(\d{1,2})/,
169 handler: function(bits) {
170 var d = new Date();
171 d.setYear(parseInt(bits[1]));
172 d.setMonth(parseInt(bits[2], 10) - 1);
173 d.setDate(parseInt(bits[3], 10));
174 return d;
175 }
176 },
177 ];
178
179 function parseDateString(s) {
180 for (var i = 0; i < dateParsePatterns.length; i++) {
181 var re = dateParsePatterns[i].re;
182 var handler = dateParsePatterns[i].handler;
183 var bits = re.exec(s);
184 if (bits) {
185 return handler(bits);
186 }
187 }
188 throw new Error("Invalid date string");
189 }
190
191 function fmt00(x) {
192 // fmt00: Tags leading zero onto numbers 0 - 9.
193 // Particularly useful for displaying results from Date methods.
194 //
195 if (Math.abs(parseInt(x)) < 10){
196 x = "0"+ Math.abs(x);
197 }
198 return x;
199 }
200
201 function parseDateStringISO(s) {
202 try {
203 var d = parseDateString(s);
204 return d.getFullYear() + '-' + (fmt00(d.getMonth() + 1)) + '-' + fmt00(d.getDate())
205 }
206 catch (e) { return s; }
207 }
208 function magicDate(input) {
209 var messagespan = input.id + 'Msg';
210 try {
211 var d = parseDateString(input.value);
212 input.value = d.getFullYear() + '-' + (fmt00(d.getMonth() + 1)) + '-' +
213 fmt00(d.getDate());
214 input.className = '';
215 // Human readable date
216 if (document.getElementById(messagespan)) {
217 document.getElementById(messagespan).firstChild.nodeValue = d.toDateString();
218 document.getElementById(messagespan).className = 'normal';
219 }
220 }
221 catch (e) {
222 input.className = 'error';
223 var message = e.message;
224 // Fix for IE6 bug
225 if (message.indexOf('is null or not an object') > -1) {
226 message = 'Invalid date string';
227 }
228 if (document.getElementById(messagespan)) {
229 document.getElementById(messagespan).firstChild.nodeValue = message;
230 document.getElementById(messagespan).className = 'error';
231 }
232 }
233 }