chore: Move editor into codebase (#2930)

shared/editor/marks/Code.ts

@@ -0,0 +1,87 @@
+import { toggleMark } from "prosemirror-commands";
+import {
+  MarkSpec,
+  MarkType,
+  Node as ProsemirrorNode,
+  Mark as ProsemirrorMark,
+} from "prosemirror-model";
+import moveLeft from "../commands/moveLeft";
+import moveRight from "../commands/moveRight";
+import markInputRule from "../lib/markInputRule";
+import { MarkdownSerializerState } from "../lib/markdown/serializer";
+import Mark from "./Mark";
+
+function backticksFor(node: ProsemirrorNode, side: -1 | 1) {
+  const ticks = /`+/g;
+  let match: RegExpMatchArray | null;
+  let len = 0;
+
+  if (node.isText) {
+    while ((match = ticks.exec(node.text || ""))) {
+      len = Math.max(len, match[0].length);
+    }
+  }
+
+  let result = len > 0 && side > 0 ? " `" : "`";
+  for (let i = 0; i < len; i++) {
+    result += "`";
+  }
+  if (len > 0 && side < 0) {
+    result += " ";
+  }
+  return result;
+}
+
+export default class Code extends Mark {
+  get name() {
+    return "code_inline";
+  }
+
+  get schema(): MarkSpec {
+    return {
+      excludes: "_",
+      parseDOM: [{ tag: "code", preserveWhitespace: true }],
+      toDOM: () => ["code", { spellCheck: "false" }],
+    };
+  }
+
+  inputRules({ type }: { type: MarkType }) {
+    return [markInputRule(/(?:^|[^`])(`([^`]+)`)$/, type)];
+  }
+
+  keys({ type }: { type: MarkType }) {
+    // Note: This key binding only works on non-Mac platforms
+    // https://github.com/ProseMirror/prosemirror/issues/515
+    return {
+      "Mod`": toggleMark(type),
+      ArrowLeft: moveLeft(),
+      ArrowRight: moveRight(),
+    };
+  }
+
+  toMarkdown() {
+    return {
+      open(
+        _state: MarkdownSerializerState,
+        _mark: ProsemirrorMark,
+        parent: ProsemirrorNode,
+        index: number
+      ) {
+        return backticksFor(parent.child(index), -1);
+      },
+      close(
+        _state: MarkdownSerializerState,
+        _mark: ProsemirrorMark,
+        parent: ProsemirrorNode,
+        index: number
+      ) {
+        return backticksFor(parent.child(index - 1), 1);
+      },
+      escape: false,
+    };
+  }
+
+  parseMarkdown() {
+    return { mark: "code_inline" };
+  }
+}