135 lines
3.3 KiB
JavaScript
135 lines
3.3 KiB
JavaScript
'use strict';
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const TEMPLATE_REGEX = /(?:\\(u(?:[a-f\d]{4}|\{[a-f\d]{1,6}\})|x[a-f\d]{2}|.))|(?:\{(~)?(\w+(?:\([^)]*\))?(?:\.\w+(?:\([^)]*\))?)*)(?:[ \t]|(?=\r?\n)))|(\})|((?:.|[\r\n\f])+?)/gi;
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const STYLE_REGEX = /(?:^|\.)(\w+)(?:\(([^)]*)\))?/g;
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const STRING_REGEX = /^(['"])((?:\\.|(?!\1)[^\\])*)\1$/;
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const ESCAPE_REGEX = /\\(u(?:[a-f\d]{4}|\{[a-f\d]{1,6}\})|x[a-f\d]{2}|.)|([^\\])/gi;
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const ESCAPES = new Map([
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['n', '\n'],
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['r', '\r'],
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['t', '\t'],
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['b', '\b'],
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['f', '\f'],
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['v', '\v'],
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['0', '\0'],
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['\\', '\\'],
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['e', '\u001B'],
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['a', '\u0007']
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]);
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function unescape(c) {
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const u = c[0] === 'u';
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const bracket = c[1] === '{';
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if ((u && !bracket && c.length === 5) || (c[0] === 'x' && c.length === 3)) {
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return String.fromCharCode(parseInt(c.slice(1), 16));
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}
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if (u && bracket) {
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return String.fromCodePoint(parseInt(c.slice(2, -1), 16));
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}
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return ESCAPES.get(c) || c;
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}
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function parseArguments(name, arguments_) {
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const results = [];
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const chunks = arguments_.trim().split(/\s*,\s*/g);
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let matches;
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for (const chunk of chunks) {
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const number = Number(chunk);
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if (!Number.isNaN(number)) {
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results.push(number);
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} else if ((matches = chunk.match(STRING_REGEX))) {
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results.push(matches[2].replace(ESCAPE_REGEX, (m, escape, character) => escape ? unescape(escape) : character));
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} else {
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throw new Error(`Invalid Chalk template style argument: ${chunk} (in style '${name}')`);
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}
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}
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return results;
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}
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function parseStyle(style) {
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STYLE_REGEX.lastIndex = 0;
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const results = [];
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let matches;
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while ((matches = STYLE_REGEX.exec(style)) !== null) {
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const name = matches[1];
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if (matches[2]) {
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const args = parseArguments(name, matches[2]);
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results.push([name].concat(args));
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} else {
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results.push([name]);
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}
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}
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return results;
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}
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function buildStyle(chalk, styles) {
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const enabled = {};
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for (const layer of styles) {
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for (const style of layer.styles) {
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enabled[style[0]] = layer.inverse ? null : style.slice(1);
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}
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}
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let current = chalk;
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for (const [styleName, styles] of Object.entries(enabled)) {
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if (!Array.isArray(styles)) {
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continue;
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}
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if (!(styleName in current)) {
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throw new Error(`Unknown Chalk style: ${styleName}`);
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}
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current = styles.length > 0 ? current[styleName](...styles) : current[styleName];
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}
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return current;
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}
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module.exports = (chalk, temporary) => {
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const styles = [];
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const chunks = [];
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let chunk = [];
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// eslint-disable-next-line max-params
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temporary.replace(TEMPLATE_REGEX, (m, escapeCharacter, inverse, style, close, character) => {
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if (escapeCharacter) {
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chunk.push(unescape(escapeCharacter));
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} else if (style) {
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const string = chunk.join('');
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chunk = [];
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chunks.push(styles.length === 0 ? string : buildStyle(chalk, styles)(string));
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styles.push({inverse, styles: parseStyle(style)});
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} else if (close) {
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if (styles.length === 0) {
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throw new Error('Found extraneous } in Chalk template literal');
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}
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chunks.push(buildStyle(chalk, styles)(chunk.join('')));
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chunk = [];
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styles.pop();
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} else {
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chunk.push(character);
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}
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});
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chunks.push(chunk.join(''));
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if (styles.length > 0) {
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const errMsg = `Chalk template literal is missing ${styles.length} closing bracket${styles.length === 1 ? '' : 's'} (\`}\`)`;
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throw new Error(errMsg);
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}
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return chunks.join('');
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};
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