chrono-node
Version:
A natural language date parser in Javascript
67 lines • 2.52 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(`(${matchAnyPattern(MONTH_DICTIONARY)})` +
"(?:-|/|\\s*,?\\s*)" +
`(${ORDINAL_NUMBER_PATTERN})(?!\\s*(?:am|pm))\\s*` +
"(?:" +
"(?:to|\\-)\\s*" +
`(${ORDINAL_NUMBER_PATTERN})\\s*` +
")?" +
"(?:" +
`(?:-|/|\\s*,\\s*|\\s+)` +
`(${YEAR_PATTERN})` +
")?" +
"(?=\\W|$)(?!\\:\\d)", "i");
const MONTH_NAME_GROUP = 1;
const DATE_GROUP = 2;
const DATE_TO_GROUP = 3;
const YEAR_GROUP = 4;
export default class ENMonthNameMiddleEndianParser extends AbstractParserWithWordBoundaryChecking {
constructor(shouldSkipYearLikeDate) {
super();
this.shouldSkipYearLikeDate = shouldSkipYearLikeDate;
}
innerPattern() {
return PATTERN;
}
innerExtract(context, match) {
const month = MONTH_DICTIONARY[match[MONTH_NAME_GROUP].toLowerCase()];
const day = parseOrdinalNumberPattern(match[DATE_GROUP]);
if (day > 31) {
return null;
}
if (this.shouldSkipYearLikeDate) {
if (!match[DATE_TO_GROUP] && !match[YEAR_GROUP] && match[DATE_GROUP].match(/^2[0-5]$/)) {
return null;
}
}
const components = context
.createParsingComponents({
day: day,
month: month,
})
.addTag("parser/ENMonthNameMiddleEndianParser");
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;
}
}
//# sourceMappingURL=ENMonthNameMiddleEndianParser.js.map