chrono-node
Version:
A natural language date parser in Javascript
60 lines • 2.23 kB
JavaScript
import { findYearClosestToRef } from "../../../calculation/years.js";
import { MONTH_DICTIONARY } from "../constants.js";
import { ORDINAL_NUMBER_PATTERN, parseOrdinalNumberPattern } from "../constants.js";
import { YEAR_PATTERN, parseYear } from "../constants.js";
import { matchAnyPattern } from "../../../utils/pattern.js";
import { AbstractParserWithWordBoundaryChecking } from "../../../common/parsers/AbstractParserWithWordBoundary.js";
const PATTERN = new RegExp("(?:on\\s*?)?" +
`(${ORDINAL_NUMBER_PATTERN})` +
"(?:\\s*" +
"(?:tot|\\-|\\–|until|through|till|\\s)\\s*" +
`(${ORDINAL_NUMBER_PATTERN})` +
")?" +
"(?:-|/|\\s*(?:of)?\\s*)" +
"(" +
matchAnyPattern(MONTH_DICTIONARY) +
")" +
"(?:" +
"(?:-|/|,?\\s*)" +
`(${YEAR_PATTERN}(?![^\\s]\\d))` +
")?" +
"(?=\\W|$)", "i");
const MONTH_NAME_GROUP = 3;
const DATE_GROUP = 1;
const DATE_TO_GROUP = 2;
const YEAR_GROUP = 4;
export default class NLMonthNameMiddleEndianParser extends AbstractParserWithWordBoundaryChecking {
innerPattern() {
return PATTERN;
}
innerExtract(context, match) {
const month = MONTH_DICTIONARY[match[MONTH_NAME_GROUP].toLowerCase()];
const day = parseOrdinalNumberPattern(match[DATE_GROUP]);
if (day > 31) {
match.index = match.index + match[DATE_GROUP].length;
return null;
}
const components = context.createParsingComponents({
day: day,
month: month,
});
if (match[YEAR_GROUP]) {
const year = parseYear(match[YEAR_GROUP]);
components.assign("year", year);
}
else {
const year = findYearClosestToRef(context.refDate, day, month);
components.imply("year", year);
}
if (!match[DATE_TO_GROUP]) {
return components;
}
const endDate = parseOrdinalNumberPattern(match[DATE_TO_GROUP]);
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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