chrono-node
Version:
A natural language date parser in Javascript
67 lines • 2.57 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
const years_1 = require("../../calculation/years");
const PATTERN = new RegExp("([^\\d]|^)" +
"([0-3]{0,1}[0-9]{1})[\\/\\.\\-]([0-3]{0,1}[0-9]{1})" +
"(?:[\\/\\.\\-]([0-9]{4}|[0-9]{2}))?" +
"(\\W|$)", "i");
const OPENING_GROUP = 1;
const ENDING_GROUP = 5;
const FIRST_NUMBERS_GROUP = 2;
const SECOND_NUMBERS_GROUP = 3;
const YEAR_GROUP = 4;
class SlashDateFormatParser {
constructor(littleEndian) {
this.groupNumberMonth = littleEndian ? SECOND_NUMBERS_GROUP : FIRST_NUMBERS_GROUP;
this.groupNumberDay = littleEndian ? FIRST_NUMBERS_GROUP : SECOND_NUMBERS_GROUP;
}
pattern() {
return PATTERN;
}
extract(context, match) {
if (match[OPENING_GROUP].length == 0 && match.index > 0 && match.index < context.text.length) {
const previousChar = context.text[match.index - 1];
if (previousChar >= "0" && previousChar <= "9") {
return;
}
}
const index = match.index + match[OPENING_GROUP].length;
const text = match[0].substr(match[OPENING_GROUP].length, match[0].length - match[OPENING_GROUP].length - match[ENDING_GROUP].length);
if (text.match(/^\d\.\d$/) || text.match(/^\d\.\d{1,2}\.\d{1,2}\s*$/)) {
return;
}
if (!match[YEAR_GROUP] && match[0].indexOf("/") < 0) {
return;
}
const result = context.createParsingResult(index, text);
let month = parseInt(match[this.groupNumberMonth]);
let day = parseInt(match[this.groupNumberDay]);
if (month < 1 || month > 12) {
if (month > 12) {
if (day >= 1 && day <= 12 && month <= 31) {
[day, month] = [month, day];
}
else {
return null;
}
}
}
if (day < 1 || day > 31) {
return null;
}
result.start.assign("day", day);
result.start.assign("month", month);
if (match[YEAR_GROUP]) {
const rawYearNumber = parseInt(match[YEAR_GROUP]);
const year = years_1.findMostLikelyADYear(rawYearNumber);
result.start.assign("year", year);
}
else {
const year = years_1.findYearClosestToRef(context.refDate, day, month);
result.start.imply("year", year);
}
return result;
}
}
exports.default = SlashDateFormatParser;
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