chore: Move editor into codebase (#2930)

shared/editor/nodes/Blockquote.ts

@@ -0,0 +1,58 @@
+import { wrappingInputRule } from "prosemirror-inputrules";
+import { NodeSpec, Node as ProsemirrorNode, NodeType } from "prosemirror-model";
+import { EditorState, Transaction } from "prosemirror-state";
+import toggleWrap from "../commands/toggleWrap";
+import { MarkdownSerializerState } from "../lib/markdown/serializer";
+import isNodeActive from "../queries/isNodeActive";
+import Node from "./Node";
+
+export default class Blockquote extends Node {
+  get name() {
+    return "blockquote";
+  }
+
+  get schema(): NodeSpec {
+    return {
+      content: "block+",
+      group: "block",
+      defining: true,
+      parseDOM: [{ tag: "blockquote" }],
+      toDOM: () => ["blockquote", 0],
+    };
+  }
+
+  inputRules({ type }: { type: NodeType }) {
+    return [wrappingInputRule(/^\s*>\s$/, type)];
+  }
+
+  commands({ type }: { type: NodeType }) {
+    return () => toggleWrap(type);
+  }
+
+  keys({ type }: { type: NodeType }) {
+    return {
+      "Ctrl->": toggleWrap(type),
+      "Mod-]": toggleWrap(type),
+      "Shift-Enter": (
+        state: EditorState,
+        dispatch: (tr: Transaction) => void
+      ) => {
+        if (!isNodeActive(type)(state)) {
+          return false;
+        }
+
+        const { tr, selection } = state;
+        dispatch(tr.split(selection.to));
+        return true;
+      },
+    };
+  }
+
+  toMarkdown(state: MarkdownSerializerState, node: ProsemirrorNode) {
+    state.wrapBlock("> ", undefined, node, () => state.renderContent(node));
+  }
+
+  parseMarkdown() {
+    return { block: "blockquote" };
+  }
+}