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

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

;(function (mod) {
    if (typeof exports == 'object' && typeof module == 'object')
        // CommonJS
        mod(require('../../lib/codemirror'))
    else if (typeof define == 'function' && define.amd)
        // AMD
        define(['../../lib/codemirror'], mod)
    // Plain browser env
    else mod(CodeMirror)
})(function (CodeMirror) {
    'use strict'

    CodeMirror.defineMode('diff', function () {
        var TOKEN_NAMES = {
            '+': 'positive',
            '-': 'negative',
            '@': 'meta',
        }

        return {
            token: function (stream) {
                var tw_pos = stream.string.search(/[\t ]+?$/)

                if (!stream.sol() || tw_pos === 0) {
                    stream.skipToEnd()
                    return ('error ' + (TOKEN_NAMES[stream.string.charAt(0)] || '')).replace(/ $/, '')
                }

                var token_name = TOKEN_NAMES[stream.peek()] || stream.skipToEnd()

                if (tw_pos === -1) {
                    stream.skipToEnd()
                } else {
                    stream.pos = tw_pos
                }

                return token_name
            },
        }
    })

    CodeMirror.defineMIME('text/x-diff', 'diff')
})