parjs/dist/internal/parsers/char-where.js

Library for building parsers using combinators.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.charWhere = void 0;
const parser_1 = require("../parser");
const result_1 = require("../result");
class CharWhere extends parser_1.ParjserBase {
    constructor(predicate) {
        super();
        this.predicate = predicate;
        this.type = "charWhere";
        this.expecting = "expecting a character matching a predicate";
    }
    _apply(ps) {
        const { position, input } = ps;
        const predicate = this.predicate;
        if (position >= input.length) {
            ps.kind = result_1.ResultKind.SoftFail;
            ps.reason = "expecting a character";
            return;
        }
        const curChar = input[position];
        const result = predicate(curChar, ps.userState);
        if (result !== true) {
            ps.reason = result.reason || this.expecting;
            ps.kind = result.kind || "Soft";
            return;
        }
        ps.value = curChar;
        ps.position++;
        ps.kind = result_1.ResultKind.Ok;
    }
}
/**
 * Returns a parser that parses a single character fulfilling `predicate`.
 *
 * @param predicate The predicate the character has to fulfill.
 */
function charWhere(predicate) {
    return new CharWhere(predicate);
}
exports.charWhere = charWhere;
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