Marc Mintel
5397309103
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119 lines
3.3 KiB
Plaintext
119 lines
3.3 KiB
Plaintext
/**
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* https://unicode.org/reports/tr35/tr35-dates.html#Date_Field_Symbol_Table
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* Credit: https://github.com/caridy/intl-datetimeformat-pattern/blob/master/index.js
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* with some tweaks
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*/
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const DATE_TIME_REGEX = /(?:[Eec]{1,6}|G{1,5}|[Qq]{1,5}|(?:[yYur]+|U{1,5})|[ML]{1,5}|d{1,2}|D{1,3}|F{1}|[abB]{1,5}|[hkHK]{1,2}|w{1,2}|W{1}|m{1,2}|s{1,2}|[zZOvVxX]{1,4})(?=([^']*'[^']*')*[^']*$)/g;
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/**
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* Parse Date time skeleton into Intl.DateTimeFormatOptions
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* Ref: https://unicode.org/reports/tr35/tr35-dates.html#Date_Field_Symbol_Table
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* @public
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* @param skeleton skeleton string
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*/
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export function parseDateTimeSkeleton(skeleton) {
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const result = {};
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skeleton.replace(DATE_TIME_REGEX, (match) => {
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const len = match.length;
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switch (match[0]) {
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case "G":
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result.era = len === 4 ? "long" : len === 5 ? "narrow" : "short";
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break;
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case "y":
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result.year = len === 2 ? "2-digit" : "numeric";
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break;
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case "Y":
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case "u":
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case "U":
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case "r": throw new RangeError("`Y/u/U/r` (year) patterns are not supported, use `y` instead");
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case "q":
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case "Q": throw new RangeError("`q/Q` (quarter) patterns are not supported");
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case "M":
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case "L":
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result.month = [
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"numeric",
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"2-digit",
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"short",
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"long",
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"narrow"
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][len - 1];
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break;
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case "w":
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case "W": throw new RangeError("`w/W` (week) patterns are not supported");
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case "d":
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result.day = ["numeric", "2-digit"][len - 1];
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break;
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case "D":
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case "F":
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case "g": throw new RangeError("`D/F/g` (day) patterns are not supported, use `d` instead");
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case "E":
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result.weekday = len === 4 ? "long" : len === 5 ? "narrow" : "short";
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break;
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case "e":
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if (len < 4) {
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throw new RangeError("`e..eee` (weekday) patterns are not supported");
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}
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result.weekday = [
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"short",
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"long",
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"narrow",
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"short"
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][len - 4];
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break;
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case "c":
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if (len < 4) {
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throw new RangeError("`c..ccc` (weekday) patterns are not supported");
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}
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result.weekday = [
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"short",
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"long",
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"narrow",
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"short"
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][len - 4];
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break;
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case "a":
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result.hour12 = true;
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break;
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case "b":
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case "B": throw new RangeError("`b/B` (period) patterns are not supported, use `a` instead");
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case "h":
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result.hourCycle = "h12";
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result.hour = ["numeric", "2-digit"][len - 1];
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break;
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case "H":
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result.hourCycle = "h23";
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result.hour = ["numeric", "2-digit"][len - 1];
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break;
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case "K":
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result.hourCycle = "h11";
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result.hour = ["numeric", "2-digit"][len - 1];
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break;
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case "k":
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result.hourCycle = "h24";
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result.hour = ["numeric", "2-digit"][len - 1];
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break;
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case "j":
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case "J":
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case "C": throw new RangeError("`j/J/C` (hour) patterns are not supported, use `h/H/K/k` instead");
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case "m":
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result.minute = ["numeric", "2-digit"][len - 1];
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break;
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case "s":
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result.second = ["numeric", "2-digit"][len - 1];
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break;
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case "S":
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case "A": throw new RangeError("`S/A` (second) patterns are not supported, use `s` instead");
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case "z":
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result.timeZoneName = len < 4 ? "short" : "long";
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break;
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case "Z":
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case "O":
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case "v":
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case "V":
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case "X":
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case "x": throw new RangeError("`Z/O/v/V/X/x` (timeZone) patterns are not supported, use `z` instead");
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}
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return "";
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});
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return result;
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}
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