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| <script lang="ts"> | |
| import Modal from "./Modal.svelte"; | |
| import { onMount, onDestroy } from "svelte"; | |
| import CarbonCopy from "~icons/carbon/copy"; | |
| interface Props { | |
| html: string; | |
| onclose?: () => void; | |
| } | |
| let { html, onclose }: Props = $props(); | |
| let iframeEl: HTMLIFrameElement | undefined = $state(); | |
| let channel = $state(`preview_${Math.random().toString(36).slice(2)}`); | |
| let errors: { message: string; stack?: string }[] = $state([]); | |
| function buildSrcdoc(content: string, channel: string): string { | |
| const trimmed = content.trimStart(); | |
| const svgPattern = /^(?:<\?xml[^>]*>\s*)?(?:<!doctype\s+svg[^>]*>\s*)?<svg[\s>]/i; | |
| const baseTag = '<base target="_blank">'; | |
| const disabledLinkStyles = `<style> | |
| a[data-chatui-link-disabled] {} | |
| </style>`; | |
| const endScriptTag = "</scr" + "ipt>"; | |
| const errorHook = `\n<script>\n(function(){\n function send(detail){\n try{ parent.postMessage({ type: 'chatui.preview.error', channel: '${channel}', detail: detail }, '*'); }catch(e){}\n }\n function markDisabled(anchor){\n if (!anchor || anchor.dataset.chatuiLinkDisabled === 'true') return;\n anchor.dataset.chatuiLinkDisabled = 'true';\n var note = 'Link disabled in preview';\n var title = anchor.getAttribute('title');\n if (!title) {\n anchor.setAttribute('title', note);\n } else if (title.indexOf(note) === -1) {\n anchor.setAttribute('title', title + ' — ' + note);\n }\n }\n function disableAnchors(scope){\n try {\n var root = scope && scope.querySelectorAll ? scope : document;\n var anchors = root.querySelectorAll ? root.querySelectorAll('a') : [];\n for (var i = 0; i < anchors.length; i++) {\n markDisabled(anchors[i]);\n }\n } catch (err) {}\n }\n function nearestAnchor(node){\n while (node && node !== document) {\n if (node.tagName && node.tagName.toLowerCase() === 'a') return node;\n node = node.parentNode;\n }\n return null;\n }\n function intercept(ev){\n var anchor = nearestAnchor(ev.target);\n if (!anchor) return;\n markDisabled(anchor);\n ev.preventDefault();\n ev.stopPropagation();\n }\n disableAnchors();\n if (document.readyState === 'loading') {\n document.addEventListener('DOMContentLoaded', function(){ disableAnchors(); });\n } else {\n setTimeout(function(){ disableAnchors(); }, 0);\n }\n if (window.MutationObserver) {\n var observer = new MutationObserver(function(mutations){\n for (var i = 0; i < mutations.length; i++) {\n var nodes = mutations[i].addedNodes;\n for (var j = 0; j < nodes.length; j++) {\n var node = nodes[j];\n if (!node || node.nodeType !== 1) continue;\n if (node.tagName && node.tagName.toLowerCase() === 'a') {\n markDisabled(node);\n } else {\n disableAnchors(node);\n }\n }\n }\n });\n observer.observe(document.documentElement, { childList: true, subtree: true });\n }\n window.addEventListener('click', intercept, true);\n window.addEventListener('auxclick', intercept, true);\n window.addEventListener('keydown', function(ev){\n if (ev.key === 'Enter' || ev.key === ' ') {\n intercept(ev);\n }\n }, true);\n window.addEventListener('error', function(ev){\n var msg = ev && ev.message ? ev.message : 'Script error';\n var stack = ev && ev.error && ev.error.stack ? ev.error.stack : undefined;\n send({ message: msg, stack: stack });\n });\n window.addEventListener('unhandledrejection', function(ev){\n var r = ev && ev.reason;\n var msg = (typeof r === 'string') ? r : (r && r.message) ? r.message : 'Unhandled promise rejection';\n var stack = r && r.stack ? r.stack : undefined;\n send({ message: msg, stack: stack });\n });\n})();\n${endScriptTag}`; | |
| if (svgPattern.test(trimmed)) { | |
| const svgContent = trimmed | |
| .replace(/^(<\?xml[^>]*>\s*)/i, "") | |
| .replace(/^(<!doctype[^>]*>\s*)/i, ""); | |
| return `<!doctype html><html><head>${baseTag}${disabledLinkStyles}${errorHook}</head><body>${svgContent}</body></html>`; | |
| } | |
| const headMatch = content.match(/<head[^>]*>/i); | |
| if (headMatch) { | |
| return content.replace(headMatch[0], headMatch[0] + baseTag + disabledLinkStyles + errorHook); | |
| } | |
| const htmlTagMatch = content.match(/<html[^>]*>/i); | |
| if (htmlTagMatch) { | |
| return content.replace( | |
| htmlTagMatch[0], | |
| htmlTagMatch[0] + "\n<head>" + baseTag + disabledLinkStyles + errorHook + "</head>" | |
| ); | |
| } | |
| const doctypeMatch = content.match(/<!doctype[^>]*>/i); | |
| if (doctypeMatch) { | |
| const idx = content.indexOf(doctypeMatch[0]) + doctypeMatch[0].length; | |
| return ( | |
| content.slice(0, idx) + | |
| "\n<head>" + | |
| baseTag + | |
| disabledLinkStyles + | |
| errorHook + | |
| "</head>" + | |
| content.slice(idx) | |
| ); | |
| } | |
| return "<head>" + baseTag + disabledLinkStyles + errorHook + "</head>\n" + content; | |
| } | |
| let srcdoc = $derived(buildSrcdoc(html, channel)); | |
| type PreviewMessage = { | |
| type: string; | |
| channel: string; | |
| detail?: { message?: unknown; stack?: string }; | |
| }; | |
| function onMessage(ev: MessageEvent) { | |
| if (!iframeEl || ev.source !== iframeEl.contentWindow) return; | |
| const raw = ev.data as unknown; | |
| if (!raw || typeof raw !== "object") return; | |
| const data = raw as Partial<PreviewMessage>; | |
| if (data.type !== "chatui.preview.error" || data.channel !== channel) return; | |
| const detail = (data.detail ?? {}) as { message?: unknown; stack?: string }; | |
| errors = [...errors, { message: String(detail.message ?? "Error"), stack: detail.stack }]; | |
| } | |
| onMount(() => { | |
| window.addEventListener("message", onMessage); | |
| }); | |
| onDestroy(() => { | |
| window.removeEventListener("message", onMessage); | |
| if (copyTimer) clearTimeout(copyTimer); | |
| }); | |
| function composeText(): string { | |
| const lines = errors.map((e, i) => `${i + 1}. ${e.message}${e.stack ? `\n${e.stack}` : ""}`); | |
| const summary = lines[0] ?? "Unknown error"; | |
| return errors.length > 1 | |
| ? `it's not working: ${summary} (+${errors.length - 1} more) - can you fix it?` | |
| : `it's not working: ${summary} - can you fix it?`; | |
| } | |
| async function copy(text: string) { | |
| try { | |
| if (navigator.clipboard && window.isSecureContext) { | |
| await navigator.clipboard.writeText(text); | |
| } else { | |
| const ta = document.createElement("textarea"); | |
| ta.value = text; | |
| ta.style.position = "fixed"; | |
| ta.style.left = "-9999px"; | |
| document.body.appendChild(ta); | |
| ta.focus(); | |
| ta.select(); | |
| document.execCommand("copy"); | |
| document.body.removeChild(ta); | |
| } | |
| copied = true; | |
| clearTimeout(copyTimer); | |
| copyTimer = setTimeout(() => (copied = false), 1200); | |
| } catch (e) { | |
| console.error("Copy failed", e); | |
| } | |
| } | |
| let copied = $state(false); | |
| let copyTimer: ReturnType<typeof setTimeout>; | |
| function handleKeydown(event: KeyboardEvent) { | |
| // Close preview on ESC key | |
| if (event.key === "Escape") { | |
| event.preventDefault(); | |
| onclose?.(); | |
| } | |
| } | |
| </script> | |
| <svelte:window on:keydown={handleKeydown} /> | |
| <Modal width="max-w-[90dvw]" closeButton onclose={() => onclose?.()}> | |
| <div class="p-4"> | |
| <div class="relative h-[90dvh] w-[80dvw]"> | |
| <iframe | |
| bind:this={iframeEl} | |
| title="HTML Preview" | |
| class="h-full w-full rounded-lg border border-gray-200 dark:border-gray-700" | |
| sandbox="allow-scripts allow-popups" | |
| referrerpolicy="no-referrer" | |
| {srcdoc} | |
| ></iframe> | |
| {#if errors.length > 0} | |
| <button | |
| class="btn absolute bottom-4 right-4 flex items-center gap-2 rounded-full border-2 border-red-500/60 bg-red-800/90 px-4 py-1.5 text-sm text-white shadow-lg" | |
| title="Copy error" | |
| onclick={() => copy(composeText())} | |
| > | |
| <CarbonCopy class="text-xs" /> | |
| <span>{copied ? "Copied" : `Error caught (${errors.length})`}</span> | |
| </button> | |
| {/if} | |
| </div> | |
| </div> | |
| </Modal> | |