chrono-node
Version:
A natural language date parser in Javascript
51 lines • 2.42 kB
JavaScript
import { TIME_UNIT_DICTIONARY } from "../constants.js";
import { ParsingComponents } from "../../../results.js";
import dayjs from "dayjs";
import { AbstractParserWithWordBoundaryChecking } from "../../../common/parsers/AbstractParserWithWordBoundary.js";
import { matchAnyPattern } from "../../../utils/pattern.js";
const PATTERN = new RegExp(`(this|last|past|next|after\\s*this)\\s*(${matchAnyPattern(TIME_UNIT_DICTIONARY)})(?=\\s*)` + "(?=\\W|$)", "i");
const MODIFIER_WORD_GROUP = 1;
const RELATIVE_WORD_GROUP = 2;
export default class ENRelativeDateFormatParser 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 == "next" || modifier.startsWith("after")) {
const timeUnits = {};
timeUnits[timeunit] = 1;
return ParsingComponents.createRelativeFromReference(context.reference, timeUnits);
}
if (modifier == "last" || modifier == "past") {
const timeUnits = {};
timeUnits[timeunit] = -1;
return ParsingComponents.createRelativeFromReference(context.reference, timeUnits);
}
const components = context.createParsingComponents();
let date = dayjs(context.reference.instant);
if (unitWord.match(/week/i)) {
date = date.add(-date.get("d"), "d");
components.imply("day", date.date());
components.imply("month", date.month() + 1);
components.imply("year", date.year());
}
else if (unitWord.match(/month/i)) {
date = date.add(-date.date() + 1, "d");
components.imply("day", date.date());
components.assign("year", date.year());
components.assign("month", date.month() + 1);
}
else if (unitWord.match(/year/i)) {
date = date.add(-date.date() + 1, "d");
date = date.add(-date.month(), "month");
components.imply("day", date.date());
components.imply("month", date.month() + 1);
components.assign("year", date.year());
}
return components;
}
}
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