pro-docs/libs/codemirror/mode/brainfuck/brainfuck.js

// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

// Brainfuck mode created by Michael Kaminsky https://github.com/mkaminsky11

;(function (mod) {
    if (typeof exports == 'object' && typeof module == 'object') mod(require('../../lib/codemirror'))
    else if (typeof define == 'function' && define.amd) define(['../../lib/codemirror'], mod)
    else mod(CodeMirror)
})(function (CodeMirror) {
    'use strict'
    var reserve = '><+-.,[]'.split('')
    /*
  comments can be either:
  placed behind lines

        +++    this is a comment

  where reserved characters cannot be used
  or in a loop
  [
    this is ok to use [ ] and stuff
  ]
  or preceded by #
  */
    CodeMirror.defineMode('brainfuck', function () {
        return {
            startState: function () {
                return {
                    commentLine: false,
                    left: 0,
                    right: 0,
                    commentLoop: false,
                }
            },
            token: function (stream, state) {
                if (stream.eatSpace()) return null
                if (stream.sol()) {
                    state.commentLine = false
                }
                var ch = stream.next().toString()
                if (reserve.indexOf(ch) !== -1) {
                    if (state.commentLine === true) {
                        if (stream.eol()) {
                            state.commentLine = false
                        }
                        return 'comment'
                    }
                    if (ch === ']' || ch === '[') {
                        if (ch === '[') {
                            state.left++
                        } else {
                            state.right++
                        }
                        return 'bracket'
                    } else if (ch === '+' || ch === '-') {
                        return 'keyword'
                    } else if (ch === '<' || ch === '>') {
                        return 'atom'
                    } else if (ch === '.' || ch === ',') {
                        return 'def'
                    }
                } else {
                    state.commentLine = true
                    if (stream.eol()) {
                        state.commentLine = false
                    }
                    return 'comment'
                }
                if (stream.eol()) {
                    state.commentLine = false
                }
            },
        }
    })
    CodeMirror.defineMIME('text/x-brainfuck', 'brainfuck')
})