CodeMirror.js

// Most of the code from this file comes from:
// https://github.com/codemirror/CodeMirror/blob/master/addon/mode/loadmode.js
import CodeMirror from 'codemirror';

// Make CodeMirror available globally so the modes' can register themselves.
window.CodeMirror = CodeMirror

if (!CodeMirror.modeURL) CodeMirror.modeURL = 'lib/codemirror/mode/%N/%N.js';

var loading = {}

function splitCallback(cont, n) {
	var countDown = n
	return function () {
		if (--countDown === 0) cont()
	}
}

function ensureDeps(mode, cont) {
	var deps = CodeMirror.modes[mode].dependencies
	if (!deps) return cont()
	var missing = []
	for (var i = 0; i < deps.length; ++i) {
		if (!CodeMirror.modes.hasOwnProperty(deps[i])) missing.push(deps[i])
	}
	if (!missing.length) return cont()
	var split = splitCallback(cont, missing.length)
	for (i = 0; i < missing.length; ++i) CodeMirror.requireMode(missing[i], split)
}

CodeMirror.requireMode = function (mode, cont) {
	if (typeof mode !== 'string') mode = mode.name
	if (CodeMirror.modes.hasOwnProperty(mode)) return ensureDeps(mode, cont)
	if (loading.hasOwnProperty(mode)) return loading[mode].push(cont)

	var file = CodeMirror.modeURL.replace(/%N/g, mode)

	var script = document.createElement('script')
	script.src = file
	var others = document.getElementsByTagName('script')[0]
	var list = loading[mode] = [cont]

	CodeMirror.on(script, 'load', function () {
		ensureDeps(mode, function () {
			for (var i = 0; i < list.length; ++i) list[i]()
		})
	})

	others.parentNode.insertBefore(script, others)
}

CodeMirror.autoLoadMode = function (instance, mode) {
	if (CodeMirror.modes.hasOwnProperty(mode)) return

	CodeMirror.requireMode(mode, function () {
		instance.setOption('mode', instance.getOption('mode'))
	})
}

export default CodeMirror