/django/contrib/admin/media/js/dateparse.js
JavaScript | 239 lines | 201 code | 7 blank | 31 comment | 22 complexity | 81bc0017faa9db4b58c5c40d9ab87f62 MD5 | raw file
Possible License(s): BSD-3-Clause
- /* 'Magic' date parsing, by Simon Willison (6th October 2003)
- http://simon.incutio.com/archive/2003/10/06/betterDateInput
- Adapted for 6newslawrence.com, 28th January 2004
- */
- /* Finds the index of the first occurence of item in the array, or -1 if not found */
- if (typeof Array.prototype.indexOf == 'undefined') {
- Array.prototype.indexOf = function(item) {
- var len = this.length;
- for (var i = 0; i < len; i++) {
- if (this[i] == item) {
- return i;
- }
- }
- return -1;
- };
- }
- /* Returns an array of items judged 'true' by the passed in test function */
- if (typeof Array.prototype.filter == 'undefined') {
- Array.prototype.filter = function(test) {
- var matches = [];
- var len = this.length;
- for (var i = 0; i < len; i++) {
- if (test(this[i])) {
- matches[matches.length] = this[i];
- }
- }
- return matches;
- };
- }
- var monthNames = gettext("January February March April May June July August September October November December").split(" ");
- var weekdayNames = gettext("Sunday Monday Tuesday Wednesday Thursday Friday Saturday").split(" ");
- /* Takes a string, returns the index of the month matching that string, throws
- an error if 0 or more than 1 matches
- */
- function parseMonth(month) {
- var matches = monthNames.filter(function(item) {
- return new RegExp("^" + month, "i").test(item);
- });
- if (matches.length == 0) {
- throw new Error("Invalid month string");
- }
- if (matches.length > 1) {
- throw new Error("Ambiguous month");
- }
- return monthNames.indexOf(matches[0]);
- }
- /* Same as parseMonth but for days of the week */
- function parseWeekday(weekday) {
- var matches = weekdayNames.filter(function(item) {
- return new RegExp("^" + weekday, "i").test(item);
- });
- if (matches.length == 0) {
- throw new Error("Invalid day string");
- }
- if (matches.length > 1) {
- throw new Error("Ambiguous weekday");
- }
- return weekdayNames.indexOf(matches[0]);
- }
- /* Array of objects, each has 're', a regular expression and 'handler', a
- function for creating a date from something that matches the regular
- expression. Handlers may throw errors if string is unparseable.
- */
- var dateParsePatterns = [
- // Today
- { re: /^tod/i,
- handler: function() {
- return new Date();
- }
- },
- // Tomorrow
- { re: /^tom/i,
- handler: function() {
- var d = new Date();
- d.setDate(d.getDate() + 1);
- return d;
- }
- },
- // Yesterday
- { re: /^yes/i,
- handler: function() {
- var d = new Date();
- d.setDate(d.getDate() - 1);
- return d;
- }
- },
- // 4th
- { re: /^(\d{1,2})(st|nd|rd|th)?$/i,
- handler: function(bits) {
- var d = new Date();
- d.setDate(parseInt(bits[1], 10));
- return d;
- }
- },
- // 4th Jan
- { re: /^(\d{1,2})(?:st|nd|rd|th)? (\w+)$/i,
- handler: function(bits) {
- var d = new Date();
- d.setDate(1);
- d.setMonth(parseMonth(bits[2]));
- d.setDate(parseInt(bits[1], 10));
- return d;
- }
- },
- // 4th Jan 2003
- { re: /^(\d{1,2})(?:st|nd|rd|th)? (\w+),? (\d{4})$/i,
- handler: function(bits) {
- var d = new Date();
- d.setDate(1);
- d.setYear(bits[3]);
- d.setMonth(parseMonth(bits[2]));
- d.setDate(parseInt(bits[1], 10));
- return d;
- }
- },
- // Jan 4th
- { re: /^(\w+) (\d{1,2})(?:st|nd|rd|th)?$/i,
- handler: function(bits) {
- var d = new Date();
- d.setDate(1);
- d.setMonth(parseMonth(bits[1]));
- d.setDate(parseInt(bits[2], 10));
- return d;
- }
- },
- // Jan 4th 2003
- { re: /^(\w+) (\d{1,2})(?:st|nd|rd|th)?,? (\d{4})$/i,
- handler: function(bits) {
- var d = new Date();
- d.setDate(1);
- d.setYear(bits[3]);
- d.setMonth(parseMonth(bits[1]));
- d.setDate(parseInt(bits[2], 10));
- return d;
- }
- },
- // next Tuesday - this is suspect due to weird meaning of "next"
- { re: /^next (\w+)$/i,
- handler: function(bits) {
- var d = new Date();
- var day = d.getDay();
- var newDay = parseWeekday(bits[1]);
- var addDays = newDay - day;
- if (newDay <= day) {
- addDays += 7;
- }
- d.setDate(d.getDate() + addDays);
- return d;
- }
- },
- // last Tuesday
- { re: /^last (\w+)$/i,
- handler: function(bits) {
- throw new Error("Not yet implemented");
- }
- },
- // mm/dd/yyyy (American style)
- { re: /(\d{1,2})\/(\d{1,2})\/(\d{4})/,
- handler: function(bits) {
- var d = new Date();
- d.setDate(1);
- d.setYear(bits[3]);
- d.setMonth(parseInt(bits[1], 10) - 1); // Because months indexed from 0
- d.setDate(parseInt(bits[2], 10));
- return d;
- }
- },
- // yyyy-mm-dd (ISO style)
- { re: /(\d{4})-(\d{1,2})-(\d{1,2})/,
- handler: function(bits) {
- var d = new Date();
- d.setDate(1);
- d.setYear(parseInt(bits[1]));
- d.setMonth(parseInt(bits[2], 10) - 1);
- d.setDate(parseInt(bits[3], 10));
- return d;
- }
- },
- ];
- function parseDateString(s) {
- for (var i = 0; i < dateParsePatterns.length; i++) {
- var re = dateParsePatterns[i].re;
- var handler = dateParsePatterns[i].handler;
- var bits = re.exec(s);
- if (bits) {
- return handler(bits);
- }
- }
- throw new Error("Invalid date string");
- }
- function fmt00(x) {
- // fmt00: Tags leading zero onto numbers 0 - 9.
- // Particularly useful for displaying results from Date methods.
- //
- if (Math.abs(parseInt(x)) < 10){
- x = "0"+ Math.abs(x);
- }
- return x;
- }
- function parseDateStringISO(s) {
- try {
- var d = parseDateString(s);
- return d.getFullYear() + '-' + (fmt00(d.getMonth() + 1)) + '-' + fmt00(d.getDate())
- }
- catch (e) { return s; }
- }
- function magicDate(input) {
- var messagespan = input.id + 'Msg';
- try {
- var d = parseDateString(input.value);
- input.value = d.getFullYear() + '-' + (fmt00(d.getMonth() + 1)) + '-' +
- fmt00(d.getDate());
- input.className = '';
- // Human readable date
- if (document.getElementById(messagespan)) {
- document.getElementById(messagespan).firstChild.nodeValue = d.toDateString();
- document.getElementById(messagespan).className = 'normal';
- }
- }
- catch (e) {
- input.className = 'error';
- var message = e.message;
- // Fix for IE6 bug
- if (message.indexOf('is null or not an object') > -1) {
- message = 'Invalid date string';
- }
- if (document.getElementById(messagespan)) {
- document.getElementById(messagespan).firstChild.nodeValue = message;
- document.getElementById(messagespan).className = 'error';
- }
- }
- }