[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8,"_9":10,"_11":12},"actionData","errors","root",{"_228":-5,"_231":232,"_233":234},"routes/shell",{"_40":41,"_227":-5,"_228":-5,"_229":230},"routes/repo",{"_33":-7,"_34":35,"_36":37,"_38":39,"_40":41,"_42":31,"_43":31,"_44":31,"_45":31,"_46":31,"_47":31,"_48":49,"_50":49,"_51":31,"_52":-7,"_53":-7,"_54":55,"_56":57,"_58":59,"_60":-5,"_61":62,"_63":64,"_65":66,"_67":68},"routes/repo.blob",{"_13":14,"_15":16,"_17":18,"_19":20,"_21":14,"_22":23,"_24":-5,"_25":26,"_27":28,"_28":29,"_30":31,"_32":14},"ref","dace53bdbe3cedac19d6dd48a97cb4b2af77b4db","path","packages/editor/src/widgets/render-blocks.tsx","oid","1e42cb6bdb46ad6b306076b1c6076c76ba7255ec","size",13683,"commit","mounts",[],"source","plain",{"_13":14,"_15":16},"kind","text","/**\n * Rendered previews for code, math and diagrams.\n *\n * These blocks keep their source as collaborative text children, so the source\n * stays editable and merges per character. Rendering is layered over that model\n * rather than replacing it: a preview is attached beside the source, never in\n * place of the nodes Yjs is synchronising.\n *\n * KaTeX, Mermaid and the code renderer are loaded on demand — most plans\n * contain none of them, and each is large enough that paying for it up front is\n * not justified.\n *\n * Everything in the preview slot is put there by React, including the markup\n * KaTeX and Mermaid produce as strings. Two writers in one element is the\n * trap: a block whose language changes keeps its element, and an effect that\n * cleared the slot on the way out would run *after* React had already\n * committed the next renderer's nodes into it, taking them with it. One owner\n * means switching from a diagram to a fence is a reconciliation rather than a\n * race.\n */\n\nimport { useCallback, useEffect, useRef, useState } from \"react\";\nimport { createPortal } from \"react-dom\";\nimport { useLexicalComposerContext } from \"@lexical/react/LexicalComposerContext\";\nimport { readOnly$ } from \"@mdxeditor/editor\";\nimport { useCellValue } from \"@mdxeditor/gurx\";\nimport {\n\t$getNodeByKey,\n\t$getRoot,\n\t$getSelection,\n\t$isElementNode,\n\t$isRangeSelection,\n\tCOLLABORATION_TAG,\n\tHISTORIC_TAG,\n} from \"lexical\";\nimport { $isCodeBlockNode, $isMathNode } from \"@chopin/dialect\";\n\nimport { enclosing, remember } from \"../collapse\";\nimport { kindOf, LANGUAGES } from \"./code\";\nimport { CodeView } from \"./code-view\";\n\nimport type { ElementNode, LexicalEditor } from \"lexical\";\nimport type { Kind } from \"./code\";\n\ntype Block = {\n\tkey: string;\n\tkind: Kind | \"math\";\n\tinline: boolean;\n\tsource: string;\n\t/** Empty for math, and for a fence nobody has named. */\n\tlanguage: string;\n\tmeta: string;\n};\n\n/** Whether a block has a second reading of itself to show. */\nfunction renders(block: Block, html: string | undefined): boolean {\n\tif (!block.source.trim()) return false;\n\tif (block.kind === \"math\" || block.kind === \"mermaid\") return !!html;\n\treturn block.kind === \"code\" || block.kind === \"diff\";\n}\n\nfunction collect(editor: LexicalEditor): Block[] {\n\tlet blocks: Block[] = [];\n\n\teditor.getEditorState().read(() => {\n\t\tlet walk = (node: ElementNode) => {\n\t\t\tfor (let child of node.getChildren()) {\n\t\t\t\tif ($isMathNode(child)) {\n\t\t\t\t\tblocks.push({\n\t\t\t\t\t\tkey: child.getKey(),\n\t\t\t\t\t\tkind: \"math\",\n\t\t\t\t\t\tinline: child.isInlineMath(),\n\t\t\t\t\t\tsource: child.getTextContent(),\n\t\t\t\t\t\tlanguage: \"\",\n\t\t\t\t\t\tmeta: child.getMeta(),\n\t\t\t\t\t});\n\t\t\t\t} else if ($isCodeBlockNode(child)) {\n\t\t\t\t\tlet language = child.getLanguage();\n\t\t\t\t\tblocks.push({\n\t\t\t\t\t\tkey: child.getKey(),\n\t\t\t\t\t\tkind: kindOf(language),\n\t\t\t\t\t\tinline: false,\n\t\t\t\t\t\tsource: child.getTextContent(),\n\t\t\t\t\t\tlanguage,\n\t\t\t\t\t\tmeta: child.getMeta(),\n\t\t\t\t\t});\n\t\t\t\t}\n\t\t\t\tif ($isElementNode(child)) walk(child);\n\t\t\t}\n\t\t};\n\t\twalk($getRoot());\n\t});\n\n\treturn blocks;\n}\n\nasync function renderMath(source: string, inline: boolean): Promise {\n\t// The stylesheet is not decoration: KaTeX emits bare spans and leaves every\n\t// fraction bar, radical and glyph to CSS, so without it a formula renders as\n\t// scrambled text. Loaded beside the library rather than up front, and the\n\t// bundler resolves its fonts on the way.\n\tlet [katex] = await Promise.all([import(\"katex\"), import(\"katex/dist/katex.min.css\")]);\n\treturn katex.default.renderToString(source, {\n\t\tdisplayMode: !inline,\n\t\t// Untrusted input: never let a formula emit markup or navigate.\n\t\ttrust: false,\n\t\tstrict: false,\n\t\tthrowOnError: false,\n\t\toutput: \"html\",\n\t});\n}\n\nasync function renderMermaid(key: string, source: string): Promise {\n\tlet mermaid = await import(\"mermaid\");\n\tmermaid.default.initialize({\n\t\tstartOnLoad: false,\n\t\t// Diagrams come from collaborators and agents, so scripts, click\n\t\t// handlers and HTML labels stay off.\n\t\tsecurityLevel: \"strict\",\n\t\thtmlLabels: false,\n\t\ttheme: \"neutral\",\n\t});\n\tlet { svg } = await mermaid.default.render(`ace-mermaid-${key}`, source);\n\treturn svg;\n}\n\n/**\n * What a fence is, changed from the block itself.\n *\n * The language is an attribute rather than content, so it is edited through a\n * control rather than by typing — the same arrangement a callout's type has,\n * and for the same reason: the fence markers are not in the document, so there\n * is nowhere to type it. A language the list does not offer is kept and shown,\n * because the agent may well have written one and losing it on the first\n * glance at the menu would be an edit nobody asked for.\n */\nfunction Language(\n\t{ block, editor, disabled }: { block: Block; editor: LexicalEditor; disabled?: boolean },\n) {\n\tlet set = useCallback((language: string) => {\n\t\teditor.update(() => {\n\t\t\tlet node = $getNodeByKey(block.key);\n\t\t\tif (!$isCodeBlockNode(node)) return;\n\t\t\tnode.setLanguage(language);\n\t\t\t// Markdown writes an info string after a language, so meta cannot\n\t\t\t// outlive one. The node enforces this on creation; changing the\n\t\t\t// language later reaches the same rule from the other side.\n\t\t\tif (!language) node.setMeta(\"\");\n\t\t});\n\t}, [editor, block.key]);\n\n\tlet listed = LANGUAGES.some(([id]) => id === block.language);\n\n\treturn (\n\t\t set(event.currentTarget.value)}\n\t\t\tclassName=\"field-ghost cursor-pointer px-1 text-sm text-text-quaternary\"\n\t\t>\n\t\t\t\n\t\t\t{!listed && block.language && }\n\t\t\t{LANGUAGES.map(([id, label]) => )}\n\t\t\n\t);\n}\n\nfunction Toggle({ collapsed, onToggle }: { collapsed: boolean; onToggle: () => void }) {\n\treturn (\n\t\t event.preventDefault()}\n\t\t\tclassName=\"cursor-pointer rounded-sm px-1.5 py-0.5 text-sm text-text-tertiary transition hover:bg-hover hover:text-text-primary\"\n\t\t>\n\t\t\t{collapsed ? \"Show source\" : \"Hide source\"}\n\t\t\n\t);\n}\n\n/** Attaches a preview element beside a block's source, keyed to its content. */\nfunction Preview(\n\t{ block, editor, collapsed, disabled, onToggle, onHidable }: {\n\t\tblock: Block;\n\t\teditor: LexicalEditor;\n\t\tcollapsed: boolean;\n\t\tdisabled?: boolean;\n\t\tonToggle: () => void;\n\t\tonHidable: (key: string, hidable: boolean) => void;\n\t},\n) {\n\tlet [html, setHtml] = useState();\n\tlet [error, setError] = useState();\n\n\tlet drawn = block.kind === \"math\" || block.kind === \"mermaid\";\n\n\tuseEffect(() => {\n\t\t// A block that stopped being a diagram must stop showing one. Its\n\t\t// element survives the change of language, and so would the last\n\t\t// drawing made from it — beside, or instead of, whatever the new\n\t\t// language renders.\n\t\tif (!drawn) {\n\t\t\tsetHtml(undefined);\n\t\t\tsetError(undefined);\n\t\t\treturn;\n\t\t}\n\t\tlet cancelled = false;\n\n\t\tlet run = async () => {\n\t\t\tif (!block.source.trim()) {\n\t\t\t\tsetHtml(undefined);\n\t\t\t\treturn;\n\t\t\t}\n\t\t\ttry {\n\t\t\t\tlet out = block.kind === \"math\"\n\t\t\t\t\t? await renderMath(block.source, block.inline)\n\t\t\t\t\t: await renderMermaid(block.key, block.source);\n\t\t\t\tif (cancelled) return;\n\t\t\t\tsetHtml(out);\n\t\t\t\tsetError(undefined);\n\t\t\t} catch (err) {\n\t\t\t\tif (cancelled) return;\n\t\t\t\tsetHtml(undefined);\n\t\t\t\tsetError(err instanceof Error ? err.message : \"could not be rendered\");\n\t\t\t}\n\t\t};\n\n\t\tvoid run();\n\t\treturn () => {\n\t\t\tcancelled = true;\n\t\t};\n\t}, [drawn, block.key, block.kind, block.inline, block.source]);\n\n\t/*\n\t * Hiding is applied to the DOM, never to the document: the source is still\n\t * there, still synchronised, still someone else's to edit.\n\t *\n\t * Rewritten on every commit rather than only when it changes. Lexical\n\t * replaces the element whenever `updateDOM` returns true — a code block\n\t * changing language, math flipping inline — which would drop the attribute\n\t * while this still believed it had been set.\n\t */\n\tlet hide = collapsed && renders(block, html);\n\tuseEffect(() => {\n\t\tlet element = editor.getElementByKey(block.key);\n\t\tif (!element) return;\n\t\tif (hide) element.dataset.planCollapsed = \"\";\n\t\telse delete element.dataset.planCollapsed;\n\t});\n\n\tlet element = editor.getElementByKey(block.key);\n\tlet host = element?.querySelector(\"[data-plan-preview]\");\n\tlet chrome = element?.querySelector(\"[data-plan-chrome='block']\");\n\n\t// A block with nothing rendered has nothing to fall back to, so there is\n\t// nothing to offer: hiding a plain fence would leave an empty box. A\n\t// formula has no language either, so its row can be empty of both.\n\tlet hidable = renders(block, html);\n\tlet named = block.kind !== \"math\";\n\n\tuseEffect(() => {\n\t\tonHidable(block.key, hidable);\n\t\treturn () => onHidable(block.key, false);\n\t}, [block.key, hidable, onHidable]);\n\n\t// These portals are siblings, so their stable keys also need distinct roles.\n\treturn (\n\t\t<>\n\t\t\t{host\n\t\t\t\t&& createPortal(\n\t\t\t\t\t,\n\t\t\t\t\thost,\n\t\t\t\t\t`${block.key}:preview`,\n\t\t\t\t)}\n\t\t\t{chrome && (hidable || named) && createPortal(\n\t\t\t\t\n\t\t\t\t\t{named ? : }\n\t\t\t\t\t{hidable && }\n\t\t\t\t,\n\t\t\t\tchrome,\n\t\t\t\t`${block.key}:chrome`,\n\t\t\t)}\n\t\t\n\t);\n}\n\nfunction Rendered(\n\t{ block, html, error }: { block: Block; html: string | undefined; error: string | undefined },\n) {\n\tif (error) return

{error}

;\n\tif (!block.source.trim()) return null;\n\n\tif (block.kind === \"code\" || block.kind === \"diff\") {\n\t\treturn (\n\t\t\t\n\t\t);\n\t}\n\n\t// Produced by KaTeX or Mermaid from validated source under their strict\n\t// modes, not by anything the author wrote.\n\t//\n\t// Inline math is a span inside a sentence, so what wraps it has to be one\n\t// too: a block element here would put a formula somebody wrote mid-clause\n\t// on a line of its own, and the rest of the sentence after it.\n\tif (!html) return null;\n\tif (block.inline) return ;\n\treturn

;\n}\n\nexport function PreviewPlugin() {\n\tlet [editor] = useLexicalComposerContext();\n\tlet disabled = useCellValue(readOnly$);\n\tlet [blocks, setBlocks] = useState([]);\n\t/** Blocks this viewer explicitly chose to reveal. */\n\tlet [shown, setShown] = useState>({});\n\t/** Blocks that currently have a rendered preview. */\n\tlet [hidable, setHidable] = useState>(() => new Set());\n\n\t/** Read by listeners that must not re-register whenever one is toggled. */\n\tlet current = useRef(shown);\n\tcurrent.current = shown;\n\n\tlet reportHidable = useCallback((key: string, value: boolean) => {\n\t\tsetHidable(previous => {\n\t\t\tif (previous.has(key) === value) return previous;\n\t\t\tlet next = new Set(previous);\n\t\t\tif (value) next.add(key);\n\t\t\telse next.delete(key);\n\t\t\treturn next;\n\t\t});\n\t}, []);\n\n\tuseEffect(() => {\n\t\tlet update = () => setBlocks(collect(editor));\n\t\tupdate();\n\t\treturn editor.registerUpdateListener(update);\n\t}, [editor]);\n\n\t// The painter of remote cursors cannot see React state, and needs this.\n\tuseEffect(() => {\n\t\tremember(\n\t\t\teditor,\n\t\t\tnew Set([...hidable].filter(key => !shown[key])),\n\t\t);\n\t}, [editor, hidable, shown]);\n\n\t/*\n\t * Arrowing into a hidden block opens it.\n\t *\n\t * The source is the block's only editable region, so leaving it hidden with\n\t * the caret inside would mean typing into somewhere invisible. A tab strip\n\t * never has to deal with this — a hidden panel is never the selection.\n\t */\n\tuseEffect(() => {\n\t\treturn editor.registerUpdateListener(({ tags }) => {\n\t\t\t// Someone else's edit is not this reader navigating. Remote changes\n\t\t\t// can recover the local selection into a block, and that should not\n\t\t\t// reopen one they chose to close.\n\t\t\tif (tags.has(COLLABORATION_TAG) || tags.has(HISTORIC_TAG)) return;\n\t\t\teditor.getEditorState().read(() => {\n\t\t\t\tlet selection = $getSelection();\n\t\t\t\tif (!$isRangeSelection(selection)) return;\n\t\t\t\tlet key = enclosing(selection.anchor.getNode());\n\t\t\t\tif (!key || current.current[key]) return;\n\t\t\t\tsetShown(prev => ({ ...prev, [key]: true }));\n\t\t\t});\n\t\t});\n\t}, [editor]);\n\n\tlet toggle = useCallback((key: string) => {\n\t\t// Collapsing with the caret inside would strand it in a hidden box, so\n\t\t// it is moved past the block first.\n\t\tlet collapsed = !current.current[key];\n\t\tif (!collapsed) {\n\t\t\teditor.update(() => {\n\t\t\t\tlet selection = $getSelection();\n\t\t\t\tif (!$isRangeSelection(selection)) return;\n\t\t\t\tif (enclosing(selection.anchor.getNode()) !== key) 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