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