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codejar.ts
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codejar.ts
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type Options = {
tab: string
indentOn: RegExp
spellcheck: boolean
addClosing: boolean
}
type HistoryRecord = {
html: string
pos: Position
}
type Position = {
start: number
end: number
dir?: "->" | "<-"
}
export type CodeJar = ReturnType<typeof CodeJar>
export function CodeJar(editor: HTMLElement, highlight: (e: HTMLElement) => void, opt: Partial<Options> = {}) {
const options: Options = {
tab: "\t",
indentOn: /{$/,
spellcheck: false,
addClosing: true,
...opt
}
let listeners: [string, any][] = []
let history: HistoryRecord[] = []
let at = -1
let focus = false
let callback: (code: string) => void | undefined
let prev: string // code content prior keydown event
let isFirefox = navigator.userAgent.toLowerCase().indexOf("firefox") > -1
editor.setAttribute("contentEditable", isFirefox ? "true" : "plaintext-only")
editor.setAttribute("spellcheck", options.spellcheck ? "true" : "false")
editor.style.outline = "none"
editor.style.overflowWrap = "break-word"
editor.style.overflowY = "auto"
editor.style.resize = "vertical"
editor.style.whiteSpace = "pre-wrap"
highlight(editor)
const debounceHighlight = debounce(() => {
const pos = save()
highlight(editor)
restore(pos)
}, 30)
let recording = false
const shouldRecord = (event: KeyboardEvent): boolean => {
return !isUndo(event) && !isRedo(event)
&& event.key !== "Meta"
&& event.key !== "Control"
&& event.key !== "Alt"
&& !event.key.startsWith("Arrow")
}
const debounceRecordHistory = debounce((event: KeyboardEvent) => {
if (shouldRecord(event)) {
recordHistory()
recording = false
}
}, 300)
const on = <K extends keyof HTMLElementEventMap>(type: K, fn: (event: HTMLElementEventMap[K]) => void) => {
listeners.push([type, fn])
editor.addEventListener(type, fn)
}
on("keydown", event => {
if (event.defaultPrevented) return
prev = toString()
handleNewLine(event)
handleTabCharacters(event)
if (options.addClosing) handleSelfClosingCharacters(event)
handleUndoRedo(event)
if (shouldRecord(event) && !recording) {
recordHistory()
recording = true
}
})
on("keyup", event => {
if (event.defaultPrevented) return
if (event.isComposing) return
if (prev !== toString()) debounceHighlight()
debounceRecordHistory(event)
if (callback) callback(toString())
})
on("focus", _event => {
focus = true
})
on("blur", _event => {
focus = false
})
on("paste", event => {
recordHistory()
handlePaste(event)
recordHistory()
if (callback) callback(toString())
})
function save(): Position {
const s = window.getSelection()!
const pos: Position = {start: 0, end: 0, dir: undefined}
visit(editor, el => {
if (el === s.anchorNode && el === s.focusNode) {
pos.start += s.anchorOffset
pos.end += s.focusOffset
pos.dir = s.anchorOffset <= s.focusOffset ? "->" : "<-"
return "stop"
}
if (el === s.anchorNode) {
pos.start += s.anchorOffset
if (!pos.dir) {
pos.dir = "->"
} else {
return "stop"
}
} else if (el === s.focusNode) {
pos.end += s.focusOffset
if (!pos.dir) {
pos.dir = "<-"
} else {
return "stop"
}
}
if (el.nodeType === Node.TEXT_NODE) {
if (pos.dir != "->") pos.start += el.nodeValue!.length
if (pos.dir != "<-") pos.end += el.nodeValue!.length
}
})
return pos
}
function restore(pos: Position) {
const s = window.getSelection()!
let startNode: Node | undefined, startOffset = 0
let endNode: Node | undefined, endOffset = 0
if (!pos.dir) pos.dir = "->"
if (pos.start < 0) pos.start = 0
if (pos.end < 0) pos.end = 0
// Flip start and end if the direction reversed
if (pos.dir == "<-") {
const {start, end} = pos
pos.start = end
pos.end = start
}
let current = 0
visit(editor, el => {
if (el.nodeType !== Node.TEXT_NODE) return
const len = (el.nodeValue || "").length
if (current + len >= pos.start) {
if (!startNode) {
startNode = el
startOffset = pos.start - current
}
if (current + len >= pos.end) {
endNode = el
endOffset = pos.end - current
return "stop"
}
}
current += len
})
// If everything deleted place cursor at editor
if (!startNode) startNode = editor
if (!endNode) endNode = editor
// Flip back the selection
if (pos.dir == "<-") {
[startNode, startOffset, endNode, endOffset] = [endNode, endOffset, startNode, startOffset]
}
s.setBaseAndExtent(startNode, startOffset, endNode, endOffset)
}
function beforeCursor() {
const s = window.getSelection()!
const r0 = s.getRangeAt(0)
const r = document.createRange()
r.selectNodeContents(editor)
r.setEnd(r0.startContainer, r0.startOffset)
return r.toString()
}
function afterCursor() {
const s = window.getSelection()!
const r0 = s.getRangeAt(0)
const r = document.createRange()
r.selectNodeContents(editor)
r.setStart(r0.endContainer, r0.endOffset)
return r.toString()
}
function handleNewLine(event: KeyboardEvent) {
if (event.key === "Enter") {
const before = beforeCursor()
const after = afterCursor()
let [padding] = findPadding(before)
let newLinePadding = padding
// If last symbol is "{" ident new line
// Allow user defines indent rule
if (options.indentOn.test(before)) {
newLinePadding += options.tab
}
if (isFirefox) {
preventDefault(event)
insert("\n" + newLinePadding)
} else {
// Normal browsers
if (newLinePadding.length > 0) {
preventDefault(event)
insert("\n" + newLinePadding)
}
}
// Place adjacent "}" on next line
if (newLinePadding !== padding && after[0] === "}") {
const pos = save()
insert("\n" + padding)
restore(pos)
}
}
}
function handleSelfClosingCharacters(event: KeyboardEvent) {
const open = `([{'"`
const close = `)]}'"`
const codeAfter = afterCursor()
if (close.includes(event.key) && codeAfter.substr(0, 1) === event.key) {
const pos = save()
preventDefault(event)
pos.start = ++pos.end
restore(pos)
} else if (open.includes(event.key)) {
const pos = save()
preventDefault(event)
const text = event.key + close[open.indexOf(event.key)]
insert(text)
pos.start = ++pos.end
restore(pos)
}
}
function handleTabCharacters(event: KeyboardEvent) {
if (event.key === "Tab") {
preventDefault(event)
if (event.shiftKey) {
const before = beforeCursor()
let [padding, start,] = findPadding(before)
if (padding.length > 0) {
const pos = save()
// Remove full length tab or just remaining padding
const len = Math.min(options.tab.length, padding.length)
restore({start, end: start + len})
document.execCommand("delete")
pos.start -= len
pos.end -= len
restore(pos)
}
} else {
insert(options.tab)
}
}
}
function handleUndoRedo(event: KeyboardEvent) {
if (isUndo(event)) {
preventDefault(event)
at--
const record = history[at]
if (record) {
editor.innerHTML = record.html
restore(record.pos)
}
if (at < 0) at = 0
}
if (isRedo(event)) {
preventDefault(event)
at++
const record = history[at]
if (record) {
editor.innerHTML = record.html
restore(record.pos)
}
if (at >= history.length) at--
}
}
function recordHistory() {
if (!focus) return
const html = editor.innerHTML
const pos = save()
const lastRecord = history[at]
if (lastRecord) {
if (lastRecord.html === html
&& lastRecord.pos.start === pos.start
&& lastRecord.pos.end === pos.end) return
}
at++
history[at] = {html, pos}
history.splice(at + 1)
const maxHistory = 300
if (at > maxHistory) {
at = maxHistory
history.splice(0, 1)
}
}
function handlePaste(event: ClipboardEvent) {
preventDefault(event)
const text = ((event as any).originalEvent || event).clipboardData.getData("text/plain")
const pos = save()
insert(text)
highlight(editor)
restore({start: pos.end + text.length, end: pos.end + text.length})
}
function visit(editor: HTMLElement, visitor: (el: Node) => "stop" | undefined) {
const queue: Node[] = []
if (editor.firstChild) queue.push(editor.firstChild)
let el = queue.pop()
while (el) {
if (visitor(el) === "stop")
break
if (el.nextSibling) queue.push(el.nextSibling)
if (el.firstChild) queue.push(el.firstChild)
el = queue.pop()
}
}
function isCtrl(event: KeyboardEvent) {
return event.metaKey || event.ctrlKey
}
function isUndo(event: KeyboardEvent) {
return isCtrl(event) && !event.shiftKey && event.key === "z"
}
function isRedo(event: KeyboardEvent) {
return isCtrl(event) && event.shiftKey && event.key === "z"
}
function insert(text: string) {
text = text
.replace(/&/g, "&")
.replace(/</g, "<")
.replace(/>/g, ">")
.replace(/"/g, """)
.replace(/'/g, "'")
document.execCommand("insertHTML", false, text)
}
function debounce(cb: any, wait: number) {
let timeout = 0
return (...args: any) => {
clearTimeout(timeout)
timeout = window.setTimeout(() => cb(...args), wait)
}
}
function findPadding(text: string): [string, number, number] {
// Find beginning of previous line.
let i = text.length - 1
while (i >= 0 && text[i] !== "\n") i--
i++
// Find padding of the line.
let j = i
while (j < text.length && /[ \t]/.test(text[j])) j++
return [text.substring(i, j) || "", i, j]
}
function toString() {
return editor.textContent || ""
}
function preventDefault(event: Event) {
event.preventDefault()
}
return {
updateOptions(options: Partial<Options>) {
options = {...options, ...options}
},
updateCode(code: string) {
editor.textContent = code
highlight(editor)
},
onUpdate(cb: (code: string) => void) {
callback = cb
},
toString,
destroy() {
for (let [type, fn] of listeners) {
editor.removeEventListener(type, fn)
}
},
}
}