chrono-node
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A natural language date parser in Javascript
51 lines • 2.43 kB
JavaScript
import { TIME_UNIT_DICTIONARY } from "../constants.js";
import { ParsingComponents } from "../../../results.js";
import { AbstractParserWithWordBoundaryChecking } from "../../../common/parsers/AbstractParserWithWordBoundary.js";
import { matchAnyPattern } from "../../../utils/pattern.js";
const PATTERN = new RegExp(`(dit|deze|(?:aan)?komend|volgend|afgelopen|vorig)e?\\s*(${matchAnyPattern(TIME_UNIT_DICTIONARY)})(?=\\s*)` +
"(?=\\W|$)", "i");
const MODIFIER_WORD_GROUP = 1;
const RELATIVE_WORD_GROUP = 2;
export default class NLRelativeDateFormatParser extends AbstractParserWithWordBoundaryChecking {
innerPattern() {
return PATTERN;
}
innerExtract(context, match) {
const modifier = match[MODIFIER_WORD_GROUP].toLowerCase();
const unitWord = match[RELATIVE_WORD_GROUP].toLowerCase();
const timeunit = TIME_UNIT_DICTIONARY[unitWord];
if (modifier == "volgend" || modifier == "komend" || modifier == "aankomend") {
const timeUnits = {};
timeUnits[timeunit] = 1;
return ParsingComponents.createRelativeFromReference(context.reference, timeUnits);
}
if (modifier == "afgelopen" || modifier == "vorig") {
const timeUnits = {};
timeUnits[timeunit] = -1;
return ParsingComponents.createRelativeFromReference(context.reference, timeUnits);
}
const components = context.createParsingComponents();
let date = new Date(context.reference.instant.getTime());
if (unitWord.match(/week/i)) {
date.setDate(date.getDate() - date.getDay());
components.imply("day", date.getDate());
components.imply("month", date.getMonth() + 1);
components.imply("year", date.getFullYear());
}
else if (unitWord.match(/maand/i)) {
date.setDate(1);
components.imply("day", date.getDate());
components.assign("year", date.getFullYear());
components.assign("month", date.getMonth() + 1);
}
else if (unitWord.match(/jaar/i)) {
date.setDate(1);
date.setMonth(0);
components.imply("day", date.getDate());
components.imply("month", date.getMonth() + 1);
components.assign("year", date.getFullYear());
}
return components;
}
}
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