chrono-node
Version:
A natural language date parser in Javascript
100 lines • 3.53 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
const types_1 = require("../../../types");
const FIRST_REG_PATTERN = new RegExp("(^|\\s|T)" +
"(?:(?:[àa])\\s*)?" +
"(\\d{1,2})(?:h|:)?" +
"(?:(\\d{1,2})(?:m|:)?)?" +
"(?:(\\d{1,2})(?:s|:)?)?" +
"(?:\\s*(A\\.M\\.|P\\.M\\.|AM?|PM?))?" +
"(?=\\W|$)", "i");
const SECOND_REG_PATTERN = new RegExp("^\\s*(\\-|\\–|\\~|\\〜|[àa]|\\?)\\s*" +
"(\\d{1,2})(?:h|:)?" +
"(?:(\\d{1,2})(?:m|:)?)?" +
"(?:(\\d{1,2})(?:s|:)?)?" +
"(?:\\s*(A\\.M\\.|P\\.M\\.|AM?|PM?))?" +
"(?=\\W|$)", "i");
const HOUR_GROUP = 2;
const MINUTE_GROUP = 3;
const SECOND_GROUP = 4;
const AM_PM_HOUR_GROUP = 5;
class FRSpecificTimeExpressionParser {
pattern(context) {
return FIRST_REG_PATTERN;
}
extract(context, match) {
const result = context.createParsingResult(match.index + match[1].length, match[0].substring(match[1].length));
if (result.text.match(/^\d{4}$/)) {
match.index += match[0].length;
return null;
}
result.start = FRSpecificTimeExpressionParser.extractTimeComponent(result.start.clone(), match);
if (!result.start) {
match.index += match[0].length;
return null;
}
const remainingText = context.text.substring(match.index + match[0].length);
const secondMatch = SECOND_REG_PATTERN.exec(remainingText);
if (secondMatch) {
result.end = FRSpecificTimeExpressionParser.extractTimeComponent(result.start.clone(), secondMatch);
if (result.end) {
result.text += secondMatch[0];
}
}
return result;
}
static extractTimeComponent(extractingComponents, match) {
let hour = 0;
let minute = 0;
let meridiem = null;
hour = parseInt(match[HOUR_GROUP]);
if (match[MINUTE_GROUP] != null) {
minute = parseInt(match[MINUTE_GROUP]);
}
if (minute >= 60 || hour > 24) {
return null;
}
if (hour >= 12) {
meridiem = types_1.Meridiem.PM;
}
if (match[AM_PM_HOUR_GROUP] != null) {
if (hour > 12)
return null;
const ampm = match[AM_PM_HOUR_GROUP][0].toLowerCase();
if (ampm == "a") {
meridiem = types_1.Meridiem.AM;
if (hour == 12) {
hour = 0;
}
}
if (ampm == "p") {
meridiem = types_1.Meridiem.PM;
if (hour != 12) {
hour += 12;
}
}
}
extractingComponents.assign("hour", hour);
extractingComponents.assign("minute", minute);
if (meridiem !== null) {
extractingComponents.assign("meridiem", meridiem);
}
else {
if (hour < 12) {
extractingComponents.imply("meridiem", types_1.Meridiem.AM);
}
else {
extractingComponents.imply("meridiem", types_1.Meridiem.PM);
}
}
if (match[SECOND_GROUP] != null) {
const second = parseInt(match[SECOND_GROUP]);
if (second >= 60)
return null;
extractingComponents.assign("second", second);
}
return extractingComponents;
}
}
exports.default = FRSpecificTimeExpressionParser;
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