@formatjs/intl-datetimeformat
Version:
Intl.DateTimeFormat polyfill
121 lines (120 loc) • 4.81 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.bestFitFormatMatcherScore = bestFitFormatMatcherScore;
exports.BestFitFormatMatcher = BestFitFormatMatcher;
var tslib_1 = require("tslib");
var ecma402_abstract_1 = require("@formatjs/ecma402-abstract");
var skeleton_1 = require("./skeleton");
var utils_1 = require("./utils");
function isNumericType(t) {
return t === 'numeric' || t === '2-digit';
}
/**
* Credit: https://github.com/andyearnshaw/Intl.js/blob/0958dc1ad8153f1056653ea22b8208f0df289a4e/src/12.datetimeformat.js#L611
* with some modifications
* @param options
* @param format
*/
function bestFitFormatMatcherScore(options, format) {
var score = 0;
if (options.hour12 && !format.hour12) {
score -= utils_1.removalPenalty;
}
else if (!options.hour12 && format.hour12) {
score -= utils_1.additionPenalty;
}
for (var _i = 0, DATE_TIME_PROPS_1 = utils_1.DATE_TIME_PROPS; _i < DATE_TIME_PROPS_1.length; _i++) {
var prop = DATE_TIME_PROPS_1[_i];
var optionsProp = options[prop];
var formatProp = format[prop];
if (optionsProp === undefined && formatProp !== undefined) {
score -= utils_1.additionPenalty;
}
else if (optionsProp !== undefined && formatProp === undefined) {
score -= utils_1.removalPenalty;
}
else if (optionsProp !== formatProp) {
// extra penalty for numeric vs non-numeric
if (isNumericType(optionsProp) !==
isNumericType(formatProp)) {
score -= utils_1.differentNumericTypePenalty;
}
else {
var values = ['2-digit', 'numeric', 'narrow', 'short', 'long'];
var optionsPropIndex = values.indexOf(optionsProp);
var formatPropIndex = values.indexOf(formatProp);
var delta = Math.max(-2, Math.min(formatPropIndex - optionsPropIndex, 2));
if (delta === 2) {
score -= utils_1.longMorePenalty;
}
else if (delta === 1) {
score -= utils_1.shortMorePenalty;
}
else if (delta === -1) {
score -= utils_1.shortLessPenalty;
}
else if (delta === -2) {
score -= utils_1.longLessPenalty;
}
}
}
}
return score;
}
/**
* https://tc39.es/ecma402/#sec-bestfitformatmatcher
* Just alias to basic for now
* @param options
* @param formats
* @param implDetails Implementation details
*/
function BestFitFormatMatcher(options, formats) {
var bestScore = -Infinity;
var bestFormat = formats[0];
(0, ecma402_abstract_1.invariant)(Array.isArray(formats), 'formats should be a list of things');
for (var _i = 0, formats_1 = formats; _i < formats_1.length; _i++) {
var format = formats_1[_i];
var score = bestFitFormatMatcherScore(options, format);
if (score > bestScore) {
bestScore = score;
bestFormat = format;
}
}
var skeletonFormat = tslib_1.__assign({}, bestFormat);
var patternFormat = { rawPattern: bestFormat.rawPattern };
(0, skeleton_1.processDateTimePattern)(bestFormat.rawPattern, patternFormat);
// Kinda following https://github.com/unicode-org/icu/blob/dd50e38f459d84e9bf1b0c618be8483d318458ad/icu4j/main/classes/core/src/com/ibm/icu/text/DateTimePatternGenerator.java
// Method adjustFieldTypes
for (var prop in skeletonFormat) {
var skeletonValue = skeletonFormat[prop];
var patternValue = patternFormat[prop];
var requestedValue = options[prop];
// Don't mess with minute/second or we can get in the situation of
// 7:0:0 which is weird
if (prop === 'minute' || prop === 'second') {
continue;
}
// Nothing to do here
if (!requestedValue) {
continue;
}
// https://unicode.org/reports/tr35/tr35-dates.html#Matching_Skeletons
// Looks like we should not convert numeric to alphabetic but the other way
// around is ok
if (isNumericType(patternValue) &&
!isNumericType(requestedValue)) {
continue;
}
if (skeletonValue === requestedValue) {
continue;
}
patternFormat[prop] = requestedValue;
}
// Copy those over
patternFormat.pattern = skeletonFormat.pattern;
patternFormat.pattern12 = skeletonFormat.pattern12;
patternFormat.skeleton = skeletonFormat.skeleton;
patternFormat.rangePatterns = skeletonFormat.rangePatterns;
patternFormat.rangePatterns12 = skeletonFormat.rangePatterns12;
return patternFormat;
}