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repl: support syntax highlighting#53571
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| // Some patterns inspired by https://github.com/speed-highlight/core/blob/249ad8fe9bf3eb951eb263b5b3c35887bbbbb2eb/src/languages/js.js | ||
| 'use strict'; | ||
| const { | ||
| RegExpPrototypeExec, | ||
| StringPrototypeSlice, | ||
| } = primordials; | ||
| const { styleText, inspect } = require('util'); | ||
| const matchers = [ | ||
| { | ||
| // Single line comment or multi line comment | ||
| color: 'gray', | ||
| patterns: [ | ||
| /\/\/[^\n]*|\/\*[\s\S]*?\*\//g, | ||
| ], | ||
| }, | ||
| { | ||
| // String | ||
| color: inspect.styles.string, | ||
| patterns: [ | ||
| // 'string' or "string" | ||
| /(["'])(\\[^]|(?!\1)[^\r\n\\])*\1?/g, | ||
| // `string` | ||
| /`((?!`)[^]|\\[^])*`?/g, | ||
| ], | ||
| }, | ||
| { | ||
| // Keywords | ||
| color: inspect.styles.special, | ||
| patterns: [ | ||
| /=>|\b(as|async|await|break|case|catch|class|const|continue|debugger|default|delete|do|else|export|extends|finally|for|from|function|if|import|in|instanceof|let|new|of|return|static|super|switch|this|throw|try|typeof|var|void|while|with|yield)\b/g, | ||
| ], | ||
| }, | ||
| { | ||
| // RegExp | ||
| color: inspect.styles.regexp, | ||
| patterns: [ | ||
| // eslint-disable-next-line node-core/no-unescaped-regexp-dot | ||
| /\/(?:[^/\\\r\n]|\\.)*\/[dgimsuy]*/g, | ||
| ], | ||
| }, | ||
| { | ||
| // Number | ||
| color: inspect.styles.number, | ||
| patterns: [ | ||
| /(\.e?|\b)\d(e-|[\d.oxa-fA-F_])*(\.|\b)/g, | ||
| /\bNaN\b/g, | ||
| ], | ||
| }, | ||
| { | ||
| // Undefined | ||
| color: inspect.styles.undefined, | ||
| patterns: [ | ||
| /\bundefined\b/g, | ||
| ], | ||
| }, | ||
| { | ||
| // Null | ||
| color: inspect.styles.null, | ||
| patterns: [ | ||
| /\bnull\b/g, | ||
| ], | ||
| }, | ||
| { | ||
| // Boolean | ||
| color: inspect.styles.boolean, | ||
| patterns: [ | ||
| /\b(true|false)\b/g, | ||
| ], | ||
| }, | ||
| { | ||
| // Operator | ||
| color: inspect.styles.special, | ||
| patterns: [ | ||
| /[/*+:?&|%^~=!,<>.^-]+/g, | ||
| ], | ||
| }, | ||
| { | ||
| // Identifier | ||
| color: null, | ||
| patterns: [ | ||
| /\b[A-Z][\w_]*\b/g, | ||
| ], | ||
| }, | ||
| { | ||
| // Function Declaration | ||
| color: inspect.styles.special, | ||
| patterns: [ | ||
| // eslint-disable-next-line no-useless-escape | ||
| /[a-zA-Z$_][\w$_]*(?=\s*((\?\.)?\s*\(|=\s*(\(?[\w,{}\[\])]+\)? =>|function\b)))/g, | ||
| ], | ||
| }, | ||
| ]; | ||
| function highlight(code) { | ||
| let tokens = ''; | ||
| for (let index = 0; index < code.length;) { | ||
| let match = null; | ||
| let matchIndex = code.length; | ||
| let matchType = null; | ||
| for (const { color, patterns } of matchers) { | ||
| for (const pattern of patterns) { | ||
| pattern.lastIndex = index; | ||
| const result = RegExpPrototypeExec(pattern, code); | ||
| if (result && result.index < matchIndex) { | ||
| match = result[0]; | ||
| matchIndex = result.index; | ||
| matchType = color; | ||
| } | ||
| } | ||
| } | ||
| if (matchIndex > index) { | ||
| tokens += StringPrototypeSlice(code, index, matchIndex); | ||
| } | ||
| if (match) { | ||
| tokens += matchType ? styleText(matchType, match) : match; | ||
| index = matchIndex + match.length; | ||
| } else { | ||
| break; | ||
| } | ||
| } | ||
| return tokens; | ||
| } | ||
| module.exports = highlight; |
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