parjs/internal/parsers/regexp.js

A parser-combinator library for JavaScript.

"use strict";
/**
 * @module parjs
 */
/** */
Object.defineProperty(exports, "__esModule", { value: true });
const result_1 = require("../result");
const parser_1 = require("../parser");
/**
 * Returns a parser that will try to match the regular expression at the current
 * position and yield the result set. If it can't, the parser will fail softly.
 * The match must start at the current position. It can't skip any part of the
 * input.
 * @param origRegexp
 */
function regexp(origRegexp) {
    let flags = [origRegexp.ignoreCase && "i", origRegexp.multiline && "m"].filter(x => x).join("");
    let regexp = new RegExp(origRegexp.source, `${flags}y`);
    this.reason = `expecting input matching /${origRegexp.source}/`;
    return new class Regexp extends parser_1.ParjserBase {
        constructor() {
            super(...arguments);
            this.type = "regexp";
            this.expecting = `expecting input matching '${regexp.source}'`;
        }
        _apply(ps) {
            let { input, position } = ps;
            regexp.lastIndex = position;
            let match = regexp.exec(input);
            if (!match) {
                ps.kind = result_1.ResultKind.SoftFail;
                return;
            }
            ps.position += match[0].length;
            ps.value = match.slice();
            ps.kind = result_1.ResultKind.Ok;
        }
    }();
}
exports.regexp = regexp;

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