"use strict";
/*---------------------------------------------------------------------------------------------
 *  Copyright (c) IBM Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.toYamlStringScalar = toYamlStringScalar;
function toYamlStringScalar(s, preferSingleQuote = false) {
    const quote = preferSingleQuote ? "'" : '"';
    // empty string
    if (s.length === 0) {
        return `${quote}${quote}`;
    }
    // single quote character
    if (s.length === 1 && s === '"') {
        return '"\\""';
    }
    // literal quote strings like "" or ''
    if (s.length === 2 && ((s[0] === '"' && s[1] === '"') || (s[0] === "'" && s[1] === "'"))) {
        return s[0] === '"' ? '"\\"\\""' : `"''"`;
    }
    // check if the string is already a properly quoted YAML string
    if (s.length >= 2) {
        const firstChar = s[0];
        const lastChar = s[s.length - 1];
        if ((firstChar === '"' && lastChar === '"') || (firstChar === "'" && lastChar === "'")) {
            return s;
        }
    }
    // strings containing quotes or backslashes
    if (/["\\]/.test(s)) {
        return JSON.stringify(s);
    }
    // support YAML spec 1.1 boolean values and null
    if (/^(?:on|off|true|false|yes|no|null|~)$/i.test(s)) {
        return `${quote}${s}${quote}`;
    }
    // numeric values: integer/float, hex (0x), and octal (0o or YAML 1.1 style 0[0-7]+)
    if (/^-?(?:0|[1-9]\d*)(?:\.\d+)?(?:[eE][+-]?\d+)?$/.test(s) ||
        /^0x[0-9a-fA-F]+$/.test(s) ||
        /^0o[0-7]+$/.test(s) ||
        /^0[0-7]+$/.test(s)) {
        return `"${s}"`;
    }
    // leading/trailing whitespaces need quoting
    if (/^\s|\s$/.test(s)) {
        return preferSingleQuote ? `'${s.replace(/'/g, "''")}'` : JSON.stringify(s);
    }
    // comment indicator
    if (/(?:^|\s)#/.test(s)) {
        return preferSingleQuote ? `'${s.replace(/'/g, "''")}'` : JSON.stringify(s);
    }
    // reserved indicators that cannot start a plain scalar
    if (/^[\][{}#&*!|>'"%@`]/.test(s)) {
        return preferSingleQuote ? `'${s.replace(/'/g, "''")}'` : JSON.stringify(s);
    }
    // -, ?, or : followed by space or end
    if (/^[-?:](\s|$)/.test(s)) {
        return preferSingleQuote ? `'${s.replace(/'/g, "''")}'` : JSON.stringify(s);
    }
    // colon in middle (mapping key indicator)
    // e.g. `foo: bar` or `foo : bar` needs quoting, but `foo:bar` does not
    if (/(?:^|[^:]):(?:\s|$)/.test(s)) {
        return preferSingleQuote ? `'${s.replace(/'/g, "''")}'` : JSON.stringify(s);
    }
    // newlines, tabs, or carriage return
    if (/[\n\t\r]/.test(s)) {
        return JSON.stringify(s);
    }
    return s;
}
//# sourceMappingURL=yamlScalar.js.map