chrono-node
Version:
A natural language date parser in Javascript
52 lines • 1.95 kB
JavaScript
import { findYearClosestToRef } from "../../../calculation/years.js";
import { MONTH_DICTIONARY, YEAR_PATTERN, parseYear } from "../constants.js";
import { matchAnyPattern } from "../../../utils/pattern.js";
import { AbstractParserWithWordBoundaryChecking } from "../../../common/parsers/AbstractParserWithWordBoundary.js";
const PATTERN = new RegExp(`(${matchAnyPattern(MONTH_DICTIONARY)})` +
"(?:-|/|\\s*,?\\s*)" +
"([0-9]{1,2})" +
"(?:" +
"\\s*(?:-|–|s\\.d\\.?|s/d|sampai(?:\\s+dengan)?|hingga)\\s*" +
"([0-9]{1,2})" +
")?" +
"(?:" +
"(?:-|/|\\s*,\\s*|\\s+)" +
`(?:tahun\\s+)?(${YEAR_PATTERN})` +
")?" +
"(?=\\W|$)(?![.:]\\d)", "i");
const MONTH_NAME_GROUP = 1;
const DATE_GROUP = 2;
const DATE_TO_GROUP = 3;
const YEAR_GROUP = 4;
export default class IDMonthNameMiddleEndianParser extends AbstractParserWithWordBoundaryChecking {
innerPattern() {
return PATTERN;
}
innerExtract(context, match) {
const month = MONTH_DICTIONARY[match[MONTH_NAME_GROUP].toLowerCase()];
const day = parseInt(match[DATE_GROUP]);
if (day > 31) {
return null;
}
const components = context.createParsingComponents({ day: day, month: month });
if (match[YEAR_GROUP]) {
components.assign("year", parseYear(match[YEAR_GROUP]));
}
else {
components.imply("year", findYearClosestToRef(context.refDate, day, month));
}
if (!match[DATE_TO_GROUP]) {
return components;
}
const endDate = parseInt(match[DATE_TO_GROUP]);
if (endDate > 31) {
return null;
}
const result = context.createParsingResult(match.index, match[0]);
result.start = components;
result.end = components.clone();
result.end.assign("day", endDate);
return result;
}
}
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