chrono-node
Version:
A natural language date parser in Javascript
31 lines • 1.43 kB
JavaScript
import { TIME_UNITS_PATTERN, parseTimeUnits, TIME_UNITS_NO_ABBR_PATTERN } from "../constants.js";
import { ParsingComponents } from "../../../results.js";
import { AbstractParserWithWordBoundaryChecking } from "../../../common/parsers/AbstractParserWithWordBoundary.js";
import { reverseTimeUnits } from "../../../utils/timeunits.js";
const PATTERN = new RegExp(`(this|last|past|next|after|\\+|-)\\s*(${TIME_UNITS_PATTERN})(?=\\W|$)`, "i");
const PATTERN_NO_ABBR = new RegExp(`(this|last|past|next|after|\\+|-)\\s*(${TIME_UNITS_NO_ABBR_PATTERN})(?=\\W|$)`, "i");
export default class ENTimeUnitCasualRelativeFormatParser extends AbstractParserWithWordBoundaryChecking {
constructor(allowAbbreviations = true) {
super();
this.allowAbbreviations = allowAbbreviations;
}
innerPattern() {
return this.allowAbbreviations ? PATTERN : PATTERN_NO_ABBR;
}
innerExtract(context, match) {
const prefix = match[1].toLowerCase();
let timeUnits = parseTimeUnits(match[2]);
if (!timeUnits) {
return null;
}
switch (prefix) {
case "last":
case "past":
case "-":
timeUnits = reverseTimeUnits(timeUnits);
break;
}
return ParsingComponents.createRelativeFromReference(context.reference, timeUnits);
}
}
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