refractor/lang/lilypond.js

Lightweight, robust, elegant virtual syntax highlighting using Prism

// @ts-nocheck
/**
 * @import {Refractor} from '../lib/core.js'
 */
import refractorScheme from './scheme.js'
lilypond.displayName = 'lilypond'
lilypond.aliases = ['ly']

/** @param {Refractor} Prism */
export default function lilypond(Prism) {
  Prism.register(refractorScheme)
  ;(function (Prism) {
    var schemeExpression =
      /\((?:[^();"#\\]|\\[\s\S]|;.*(?!.)|"(?:[^"\\]|\\.)*"|#(?:\{(?:(?!#\})[\s\S])*#\}|[^{])|<expr>)*\)/
        .source
    // allow for up to pow(2, recursivenessLog2) many levels of recursive brace expressions
    // For some reason, this can't be 4
    var recursivenessLog2 = 5
    for (var i = 0; i < recursivenessLog2; i++) {
      schemeExpression = schemeExpression.replace(/<expr>/g, function () {
        return schemeExpression
      })
    }
    schemeExpression = schemeExpression.replace(/<expr>/g, /[^\s\S]/.source)
    var lilypond = (Prism.languages.lilypond = {
      comment: /%(?:(?!\{).*|\{[\s\S]*?%\})/,
      'embedded-scheme': {
        pattern: RegExp(
          /(^|[=\s])#(?:"(?:[^"\\]|\\.)*"|[^\s()"]*(?:[^\s()]|<expr>))/.source.replace(
            /<expr>/g,
            function () {
              return schemeExpression
            }
          ),
          'm'
        ),
        lookbehind: true,
        greedy: true,
        inside: {
          scheme: {
            pattern: /^(#)[\s\S]+$/,
            lookbehind: true,
            alias: 'language-scheme',
            inside: {
              'embedded-lilypond': {
                pattern: /#\{[\s\S]*?#\}/,
                greedy: true,
                inside: {
                  punctuation: /^#\{|#\}$/,
                  lilypond: {
                    pattern: /[\s\S]+/,
                    alias: 'language-lilypond',
                    inside: null // see below
                  }
                }
              },
              rest: Prism.languages.scheme
            }
          },
          punctuation: /#/
        }
      },
      string: {
        pattern: /"(?:[^"\\]|\\.)*"/,
        greedy: true
      },
      'class-name': {
        pattern: /(\\new\s+)[\w-]+/,
        lookbehind: true
      },
      keyword: {
        pattern: /\\[a-z][-\w]*/i,
        inside: {
          punctuation: /^\\/
        }
      },
      operator: /[=|]|<<|>>/,
      punctuation: {
        pattern:
          /(^|[a-z\d])(?:'+|,+|[_^]?-[_^]?(?:[-+^!>._]|(?=\d))|[_^]\.?|[.!])|[{}()[\]<>^~]|\\[()[\]<>\\!]|--|__/,
        lookbehind: true
      },
      number: /\b\d+(?:\/\d+)?\b/
    })
    lilypond['embedded-scheme'].inside['scheme'].inside[
      'embedded-lilypond'
    ].inside['lilypond'].inside = lilypond
    Prism.languages.ly = lilypond
  })(Prism)
}