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const MAX_BREAKS = 200
export function createTextFragment(content: string): DocumentFragment {
const fragment = document.createDocumentFragment()
let breaks = 0
for (const char of content) {
if (char !== "\n") continue
breaks += 1
if (breaks > MAX_BREAKS) {
const tail = content.endsWith("\n")
const text = tail ? content.slice(0, -1) : content
if (text) fragment.appendChild(document.createTextNode(text))
if (tail) fragment.appendChild(document.createElement("br"))
return fragment
}
}
const segments = content.split("\n")
segments.forEach((segment, index) => {
if (segment) {
fragment.appendChild(document.createTextNode(segment))
}
if (index < segments.length - 1) {
fragment.appendChild(document.createElement("br"))
}
})
return fragment
}
export function getNodeLength(node: Node): number {
if (node.nodeType === Node.ELEMENT_NODE && (node as HTMLElement).tagName === "BR") return 1
return (node.textContent ?? "").replace(/\u200B/g, "").length
}
export function getTextLength(node: Node): number {
if (node.nodeType === Node.TEXT_NODE) return (node.textContent ?? "").replace(/\u200B/g, "").length
if (node.nodeType === Node.ELEMENT_NODE && (node as HTMLElement).tagName === "BR") return 1
let length = 0
for (const child of Array.from(node.childNodes)) {
length += getTextLength(child)
}
return length
}
export function getCursorPosition(parent: HTMLElement): number {
const selection = window.getSelection()
if (!selection || selection.rangeCount === 0) return 0
const range = selection.getRangeAt(0)
if (!parent.contains(range.startContainer)) return 0
const preCaretRange = range.cloneRange()
preCaretRange.selectNodeContents(parent)
preCaretRange.setEnd(range.startContainer, range.startOffset)
return getTextLength(preCaretRange.cloneContents())
}
export function setCursorPosition(parent: HTMLElement, position: number) {
let remaining = position
let node = parent.firstChild
while (node) {
const length = getNodeLength(node)
const isText = node.nodeType === Node.TEXT_NODE
const isPill =
node.nodeType === Node.ELEMENT_NODE &&
((node as HTMLElement).dataset.type === "file" || (node as HTMLElement).dataset.type === "agent")
const isBreak = node.nodeType === Node.ELEMENT_NODE && (node as HTMLElement).tagName === "BR"
if (isText && remaining <= length) {
const range = document.createRange()
const selection = window.getSelection()
range.setStart(node, remaining)
range.collapse(true)
selection?.removeAllRanges()
selection?.addRange(range)
return
}
if ((isPill || isBreak) && remaining <= length) {
const range = document.createRange()
const selection = window.getSelection()
if (remaining === 0) {
range.setStartBefore(node)
}
if (remaining > 0 && isPill) {
range.setStartAfter(node)
}
if (remaining > 0 && isBreak) {
const next = node.nextSibling
if (next && next.nodeType === Node.TEXT_NODE) {
range.setStart(next, 0)
}
if (!next || next.nodeType !== Node.TEXT_NODE) {
range.setStartAfter(node)
}
}
range.collapse(true)
selection?.removeAllRanges()
selection?.addRange(range)
return
}
remaining -= length
node = node.nextSibling
}
const fallbackRange = document.createRange()
const fallbackSelection = window.getSelection()
const last = parent.lastChild
if (last && last.nodeType === Node.TEXT_NODE) {
const len = last.textContent ? last.textContent.length : 0
fallbackRange.setStart(last, len)
}
if (!last || last.nodeType !== Node.TEXT_NODE) {
fallbackRange.selectNodeContents(parent)
}
fallbackRange.collapse(false)
fallbackSelection?.removeAllRanges()
fallbackSelection?.addRange(fallbackRange)
}
export function setRangeEdge(parent: HTMLElement, range: Range, edge: "start" | "end", offset: number) {
let remaining = offset
const nodes = Array.from(parent.childNodes)
for (const node of nodes) {
const length = getNodeLength(node)
const isText = node.nodeType === Node.TEXT_NODE
const isPill =
node.nodeType === Node.ELEMENT_NODE &&
((node as HTMLElement).dataset.type === "file" || (node as HTMLElement).dataset.type === "agent")
const isBreak = node.nodeType === Node.ELEMENT_NODE && (node as HTMLElement).tagName === "BR"
if (isText && remaining <= length) {
if (edge === "start") range.setStart(node, remaining)
if (edge === "end") range.setEnd(node, remaining)
return
}
if ((isPill || isBreak) && remaining <= length) {
if (edge === "start" && remaining === 0) range.setStartBefore(node)
if (edge === "start" && remaining > 0) range.setStartAfter(node)
if (edge === "end" && remaining === 0) range.setEndBefore(node)
if (edge === "end" && remaining > 0) range.setEndAfter(node)
return
}
remaining -= length
}
}
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