parjs/dist/internal/parsers/case-string.js

Library for building parsers using combinators.

"use strict";
/** Copyright © 2024, Oracle and/or its affiliates. */
/** @module parjs */
Object.defineProperty(exports, "__esModule", { value: true });
exports.caseString = void 0;
const parser_1 = require("../parser");
const result_1 = require("../result");
class CaseInsensitiveString extends parser_1.ParjserBase {
    constructor(str) {
        super();
        this.str = str;
        this.expecting = `expecting '${this.str}' (case insensitive)`;
        this.type = "string";
    }
    _apply(ps) {
        const { position, input } = ps;
        const { str } = this;
        if (position + str.length > input.length) {
            ps.kind = result_1.ResultKind.SoftFail;
            return;
        }
        // This should create a StringSlice object instead of actually
        // copying a whole string.
        const substr = input.slice(position, position + str.length);
        // Equality test is very very fast.
        if (substr.toLowerCase() !== str.toLowerCase()) {
            ps.kind = result_1.ResultKind.SoftFail;
            return;
        }
        ps.position += str.length;
        ps.value = substr;
        ps.kind = result_1.ResultKind.Ok;
    }
}
/**
 * Returns a parser that will parse the string `str` insensitive to its case and yield the text that
 * was parsed. If it can't, it will fail softly without consuming input.
 *
 * @param str The string to parse case insensitively.
 */
function caseString(str) {
    return new CaseInsensitiveString(str);
}
exports.caseString = caseString;
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