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chrono-node

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A natural language date parser in Javascript

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import { ParsingContext } from "../../../chrono"; import { ParsingComponents, ParsingResult } from "../../../results"; import { Meridiem } from "../../../types"; import { AbstractTimeExpressionParser } from "../../../common/parsers/AbstractTimeExpressionParser"; export default class ENTimeExpressionParser extends AbstractTimeExpressionParser { constructor(strictMode) { super(strictMode); } followingPhase(): string { return "\\s*(?:\\-|\\–|\\~|\\〜|to|until|through|till|\\?)\\s*"; } primaryPrefix(): string { return "(?:(?:at|from)\\s*)??"; } primarySuffix(): string { return "(?:\\s*(?:o\\W*clock|at\\s*night|in\\s*the\\s*(?:morning|afternoon)))?(?!/)(?=\\W|$)"; } extractPrimaryTimeComponents(context: ParsingContext, match: RegExpMatchArray): null | ParsingComponents { const components = super.extractPrimaryTimeComponents(context, match); if (!components) { return components; } if (match[0].endsWith("night")) { const hour = components.get("hour"); if (hour >= 6 && hour < 12) { components.assign("hour", components.get("hour") + 12); components.assign("meridiem", Meridiem.PM); } else if (hour < 6) { components.assign("meridiem", Meridiem.AM); } } if (match[0].endsWith("afternoon")) { components.assign("meridiem", Meridiem.PM); const hour = components.get("hour"); if (hour >= 0 && hour <= 6) { components.assign("hour", components.get("hour") + 12); } } if (match[0].endsWith("morning")) { components.assign("meridiem", Meridiem.AM); const hour = components.get("hour"); if (hour < 12) { components.assign("hour", components.get("hour")); } } return components.addTag("parser/ENTimeExpressionParser"); } extractFollowingTimeComponents( context: ParsingContext, match: RegExpMatchArray, result: ParsingResult ): ParsingComponents | null { const followingComponents = super.extractFollowingTimeComponents(context, match, result); if (followingComponents) { followingComponents.addTag("parser/ENTimeExpressionParser"); } return followingComponents; } }