author | Todd Larsen <tlarsen@google.com> |
Wed, 24 Sep 2008 02:22:12 +0000 | |
changeset 191 | 80f08751f1e5 |
parent 54 | 03e267d67478 |
permissions | -rw-r--r-- |
54
03e267d67478
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parents:
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1 |
/* 'Magic' date parsing, by Simon Willison (6th October 2003) |
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2 |
http://simon.incutio.com/archive/2003/10/06/betterDateInput |
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3 |
Adapted for 6newslawrence.com, 28th January 2004 |
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4 |
*/ |
03e267d67478
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parents:
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5 |
|
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6 |
/* Finds the index of the first occurence of item in the array, or -1 if not found */ |
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7 |
if (typeof Array.prototype.indexOf == 'undefined') { |
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8 |
Array.prototype.indexOf = function(item) { |
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9 |
var len = this.length; |
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10 |
for (var i = 0; i < len; i++) { |
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11 |
if (this[i] == item) { |
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12 |
return i; |
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13 |
} |
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14 |
} |
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15 |
return -1; |
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16 |
}; |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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17 |
} |
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18 |
/* Returns an array of items judged 'true' by the passed in test function */ |
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19 |
if (typeof Array.prototype.filter == 'undefined') { |
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20 |
Array.prototype.filter = function(test) { |
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21 |
var matches = []; |
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22 |
var len = this.length; |
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23 |
for (var i = 0; i < len; i++) { |
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24 |
if (test(this[i])) { |
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25 |
matches[matches.length] = this[i]; |
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26 |
} |
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27 |
} |
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28 |
return matches; |
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29 |
}; |
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30 |
} |
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31 |
|
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32 |
var monthNames = gettext("January February March April May June July August September October November December").split(" "); |
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33 |
var weekdayNames = gettext("Sunday Monday Tuesday Wednesday Thursday Friday Saturday").split(" "); |
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34 |
|
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35 |
/* Takes a string, returns the index of the month matching that string, throws |
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36 |
an error if 0 or more than 1 matches |
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37 |
*/ |
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38 |
function parseMonth(month) { |
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39 |
var matches = monthNames.filter(function(item) { |
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40 |
return new RegExp("^" + month, "i").test(item); |
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41 |
}); |
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42 |
if (matches.length == 0) { |
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43 |
throw new Error("Invalid month string"); |
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44 |
} |
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45 |
if (matches.length > 1) { |
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46 |
throw new Error("Ambiguous month"); |
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47 |
} |
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48 |
return monthNames.indexOf(matches[0]); |
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49 |
} |
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50 |
/* Same as parseMonth but for days of the week */ |
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51 |
function parseWeekday(weekday) { |
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52 |
var matches = weekdayNames.filter(function(item) { |
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53 |
return new RegExp("^" + weekday, "i").test(item); |
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54 |
}); |
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55 |
if (matches.length == 0) { |
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56 |
throw new Error("Invalid day string"); |
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57 |
} |
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58 |
if (matches.length > 1) { |
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59 |
throw new Error("Ambiguous weekday"); |
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60 |
} |
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61 |
return weekdayNames.indexOf(matches[0]); |
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62 |
} |
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63 |
|
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64 |
/* Array of objects, each has 're', a regular expression and 'handler', a |
03e267d67478
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65 |
function for creating a date from something that matches the regular |
03e267d67478
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66 |
expression. Handlers may throw errors if string is unparseable. |
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67 |
*/ |
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68 |
var dateParsePatterns = [ |
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69 |
// Today |
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70 |
{ re: /^tod/i, |
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71 |
handler: function() { |
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72 |
return new Date(); |
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73 |
} |
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74 |
}, |
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75 |
// Tomorrow |
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76 |
{ re: /^tom/i, |
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77 |
handler: function() { |
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78 |
var d = new Date(); |
03e267d67478
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79 |
d.setDate(d.getDate() + 1); |
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80 |
return d; |
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81 |
} |
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82 |
}, |
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83 |
// Yesterday |
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84 |
{ re: /^yes/i, |
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85 |
handler: function() { |
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86 |
var d = new Date(); |
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87 |
d.setDate(d.getDate() - 1); |
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88 |
return d; |
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89 |
} |
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90 |
}, |
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91 |
// 4th |
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92 |
{ re: /^(\d{1,2})(st|nd|rd|th)?$/i, |
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93 |
handler: function(bits) { |
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94 |
var d = new Date(); |
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95 |
d.setDate(parseInt(bits[1], 10)); |
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96 |
return d; |
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97 |
} |
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98 |
}, |
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99 |
// 4th Jan |
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100 |
{ re: /^(\d{1,2})(?:st|nd|rd|th)? (\w+)$/i, |
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101 |
handler: function(bits) { |
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102 |
var d = new Date(); |
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103 |
d.setDate(parseInt(bits[1], 10)); |
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104 |
d.setMonth(parseMonth(bits[2])); |
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105 |
return d; |
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106 |
} |
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107 |
}, |
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108 |
// 4th Jan 2003 |
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109 |
{ re: /^(\d{1,2})(?:st|nd|rd|th)? (\w+),? (\d{4})$/i, |
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110 |
handler: function(bits) { |
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111 |
var d = new Date(); |
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112 |
d.setDate(parseInt(bits[1], 10)); |
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113 |
d.setMonth(parseMonth(bits[2])); |
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114 |
d.setYear(bits[3]); |
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115 |
return d; |
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116 |
} |
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117 |
}, |
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118 |
// Jan 4th |
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119 |
{ re: /^(\w+) (\d{1,2})(?:st|nd|rd|th)?$/i, |
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120 |
handler: function(bits) { |
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121 |
var d = new Date(); |
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122 |
d.setDate(parseInt(bits[2], 10)); |
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123 |
d.setMonth(parseMonth(bits[1])); |
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124 |
return d; |
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125 |
} |
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126 |
}, |
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127 |
// Jan 4th 2003 |
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128 |
{ re: /^(\w+) (\d{1,2})(?:st|nd|rd|th)?,? (\d{4})$/i, |
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129 |
handler: function(bits) { |
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130 |
var d = new Date(); |
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131 |
d.setDate(parseInt(bits[2], 10)); |
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132 |
d.setMonth(parseMonth(bits[1])); |
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133 |
d.setYear(bits[3]); |
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134 |
return d; |
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135 |
} |
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136 |
}, |
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137 |
// next Tuesday - this is suspect due to weird meaning of "next" |
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138 |
{ re: /^next (\w+)$/i, |
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139 |
handler: function(bits) { |
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140 |
var d = new Date(); |
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141 |
var day = d.getDay(); |
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142 |
var newDay = parseWeekday(bits[1]); |
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143 |
var addDays = newDay - day; |
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144 |
if (newDay <= day) { |
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145 |
addDays += 7; |
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146 |
} |
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147 |
d.setDate(d.getDate() + addDays); |
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148 |
return d; |
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149 |
} |
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150 |
}, |
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151 |
// last Tuesday |
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152 |
{ re: /^last (\w+)$/i, |
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153 |
handler: function(bits) { |
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154 |
throw new Error("Not yet implemented"); |
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155 |
} |
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156 |
}, |
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157 |
// mm/dd/yyyy (American style) |
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158 |
{ re: /(\d{1,2})\/(\d{1,2})\/(\d{4})/, |
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159 |
handler: function(bits) { |
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160 |
var d = new Date(); |
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161 |
d.setYear(bits[3]); |
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162 |
d.setDate(parseInt(bits[2], 10)); |
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163 |
d.setMonth(parseInt(bits[1], 10) - 1); // Because months indexed from 0 |
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164 |
return d; |
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165 |
} |
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166 |
}, |
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167 |
// yyyy-mm-dd (ISO style) |
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168 |
{ re: /(\d{4})-(\d{1,2})-(\d{1,2})/, |
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169 |
handler: function(bits) { |
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170 |
var d = new Date(); |
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171 |
d.setYear(parseInt(bits[1])); |
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172 |
d.setMonth(parseInt(bits[2], 10) - 1); |
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173 |
d.setDate(parseInt(bits[3], 10)); |
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174 |
return d; |
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175 |
} |
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176 |
}, |
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177 |
]; |
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178 |
|
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179 |
function parseDateString(s) { |
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180 |
for (var i = 0; i < dateParsePatterns.length; i++) { |
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|
181 |
var re = dateParsePatterns[i].re; |
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|
182 |
var handler = dateParsePatterns[i].handler; |
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|
183 |
var bits = re.exec(s); |
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|
184 |
if (bits) { |
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|
185 |
return handler(bits); |
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|
186 |
} |
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|
187 |
} |
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|
188 |
throw new Error("Invalid date string"); |
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|
189 |
} |
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|
190 |
|
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|
191 |
function fmt00(x) { |
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|
192 |
// fmt00: Tags leading zero onto numbers 0 - 9. |
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|
193 |
// Particularly useful for displaying results from Date methods. |
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|
194 |
// |
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195 |
if (Math.abs(parseInt(x)) < 10){ |
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|
196 |
x = "0"+ Math.abs(x); |
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|
197 |
} |
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|
198 |
return x; |
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|
199 |
} |
03e267d67478
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|
200 |
|
03e267d67478
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|
201 |
function parseDateStringISO(s) { |
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|
202 |
try { |
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|
203 |
var d = parseDateString(s); |
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|
204 |
return d.getFullYear() + '-' + (fmt00(d.getMonth() + 1)) + '-' + fmt00(d.getDate()) |
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|
205 |
} |
03e267d67478
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|
206 |
catch (e) { return s; } |
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|
207 |
} |
03e267d67478
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|
208 |
function magicDate(input) { |
03e267d67478
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|
209 |
var messagespan = input.id + 'Msg'; |
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|
210 |
try { |
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Major reorganization of the soc svn repo, to merge into a single App Engine
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|
211 |
var d = parseDateString(input.value); |
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|
212 |
input.value = d.getFullYear() + '-' + (fmt00(d.getMonth() + 1)) + '-' + |
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|
213 |
fmt00(d.getDate()); |
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|
214 |
input.className = ''; |
03e267d67478
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|
215 |
// Human readable date |
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|
216 |
if (document.getElementById(messagespan)) { |
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Major reorganization of the soc svn repo, to merge into a single App Engine
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|
217 |
document.getElementById(messagespan).firstChild.nodeValue = d.toDateString(); |
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|
218 |
document.getElementById(messagespan).className = 'normal'; |
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|
219 |
} |
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|
220 |
} |
03e267d67478
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|
221 |
catch (e) { |
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|
222 |
input.className = 'error'; |
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|
223 |
var message = e.message; |
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|
224 |
// Fix for IE6 bug |
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|
225 |
if (message.indexOf('is null or not an object') > -1) { |
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|
226 |
message = 'Invalid date string'; |
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|
227 |
} |
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|
228 |
if (document.getElementById(messagespan)) { |
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|
229 |
document.getElementById(messagespan).firstChild.nodeValue = message; |
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|
230 |
document.getElementById(messagespan).className = 'error'; |
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|
231 |
} |
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|
232 |
} |
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Major reorganization of the soc svn repo, to merge into a single App Engine
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|
233 |
} |