source: trip-planner-front/node_modules/chalk/templates.js@ 8d391a1

'use strict';
const TEMPLATE_REGEX = /(?:\\(u[a-f\d]{4}|x[a-f\d]{2}|.))|(?:\{(~)?(\w+(?:\([^)]*\))?(?:\.\w+(?:\([^)]*\))?)*)(?:[ \t]|(?=\r?\n)))|(\})|((?:.|[\r\n\f])+?)/gi;
const STYLE_REGEX = /(?:^|\.)(\w+)(?:\(([^)]*)\))?/g;
const STRING_REGEX = /^(['"])((?:\\.|(?!\1)[^\\])*)\1$/;
const ESCAPE_REGEX = /\\(u[a-f\d]{4}|x[a-f\d]{2}|.)|([^\\])/gi;

const ESCAPES = new Map([
        ['n', '\n'],
        ['r', '\r'],
        ['t', '\t'],
        ['b', '\b'],
        ['f', '\f'],
        ['v', '\v'],
        ['0', '\0'],
        ['\\', '\\'],
        ['e', '\u001B'],
        ['a', '\u0007']
]);

function unescape(c) {
        if ((c[0] === 'u' && c.length === 5) || (c[0] === 'x' && c.length === 3)) {
                return String.fromCharCode(parseInt(c.slice(1), 16));
        }

        return ESCAPES.get(c) || c;
}

function parseArguments(name, args) {
        const results = [];
        const chunks = args.trim().split(/\s*,\s*/g);
        let matches;

        for (const chunk of chunks) {
                if (!isNaN(chunk)) {
                        results.push(Number(chunk));
                } else if ((matches = chunk.match(STRING_REGEX))) {
                        results.push(matches[2].replace(ESCAPE_REGEX, (m, escape, chr) => escape ? unescape(escape) : chr));
                } else {
                        throw new Error(`Invalid Chalk template style argument: ${chunk} (in style '${name}')`);
                }
        }

        return results;
}

function parseStyle(style) {
        STYLE_REGEX.lastIndex = 0;

        const results = [];
        let matches;

        while ((matches = STYLE_REGEX.exec(style)) !== null) {
                const name = matches[1];

                if (matches[2]) {
                        const args = parseArguments(name, matches[2]);
                        results.push([name].concat(args));
                } else {
                        results.push([name]);
                }
        }

        return results;
}

function buildStyle(chalk, styles) {
        const enabled = {};

        for (const layer of styles) {
                for (const style of layer.styles) {
                        enabled[style[0]] = layer.inverse ? null : style.slice(1);
                }
        }

        let current = chalk;
        for (const styleName of Object.keys(enabled)) {
                if (Array.isArray(enabled[styleName])) {
                        if (!(styleName in current)) {
                                throw new Error(`Unknown Chalk style: ${styleName}`);
                        }

                        if (enabled[styleName].length > 0) {
                                current = current[styleName].apply(current, enabled[styleName]);
                        } else {
                                current = current[styleName];
                        }
                }
        }

        return current;
}

module.exports = (chalk, tmp) => {
        const styles = [];
        const chunks = [];
        let chunk = [];

        // eslint-disable-next-line max-params
        tmp.replace(TEMPLATE_REGEX, (m, escapeChar, inverse, style, close, chr) => {
                if (escapeChar) {
                        chunk.push(unescape(escapeChar));
                } else if (style) {
                        const str = chunk.join('');
                        chunk = [];
                        chunks.push(styles.length === 0 ? str : buildStyle(chalk, styles)(str));
                        styles.push({inverse, styles: parseStyle(style)});
                } else if (close) {
                        if (styles.length === 0) {
                                throw new Error('Found extraneous } in Chalk template literal');
                        }

                        chunks.push(buildStyle(chalk, styles)(chunk.join('')));
                        chunk = [];
                        styles.pop();
                } else {
                        chunk.push(chr);
                }
        });

        chunks.push(chunk.join(''));

        if (styles.length > 0) {
                const errMsg = `Chalk template literal is missing ${styles.length} closing bracket${styles.length === 1 ? '' : 's'} (\`}\`)`;
                throw new Error(errMsg);
        }

        return chunks.join('');
};