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chalk
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Filename :
templates.js
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'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(''); };