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web/cm_plugins/inline_image.ts

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+import {
+  Decoration,
+  DecorationSet,
+  EditorView,
+  Range,
+  syntaxTree,
+  ViewPlugin,
+  ViewUpdate,
+  WidgetType,
+} from "../deps.ts";
+import { invisibleDecoration, isCursorInRange } from "./util.ts";
+
+class InlineImageWidget extends WidgetType {
+  constructor(readonly url: string, readonly title: string) {
+    super();
+  }
+
+  eq(other: InlineImageWidget) {
+    return other.url === this.url && other.title === this.title;
+  }
+
+  toDOM() {
+    const img = document.createElement("img");
+    if (this.url.startsWith("http")) {
+      img.src = this.url;
+    } else {
+      img.src = `fs/${this.url}`;
+    }
+    img.alt = this.title;
+    img.title = this.title;
+    img.style.display = "block";
+    img.className = "sb-inline-img";
+
+    return img;
+  }
+}
+
+const inlineImages = (view: EditorView) => {
+  const widgets: Range<Decoration>[] = [];
+  const imageRegex = /!\[(?<title>[^\]]*)\]\((?<url>.+)\)/;
+
+  for (const { from, to } of view.visibleRanges) {
+    syntaxTree(view.state).iterate({
+      from,
+      to,
+      enter: (node) => {
+        if (node.name !== "Image") {
+          return;
+        }
+
+        if (
+          !isCursorInRange(view.state, [node.from, node.to])
+        ) {
+          widgets.push(invisibleDecoration.range(node.from, node.to));
+        }
+
+        const imageRexexResult = imageRegex.exec(
+          view.state.sliceDoc(node.from, node.to),
+        );
+        if (imageRexexResult === null || !imageRexexResult.groups) {
+          return;
+        }
+
+        const url = imageRexexResult.groups.url;
+        const title = imageRexexResult.groups.title;
+        widgets.push(
+          Decoration.widget({
+            widget: new InlineImageWidget(url, title),
+          }).range(node.to),
+        );
+      },
+    });
+  }
+
+  return Decoration.set(widgets, true);
+};
+
+export const inlineImagesPlugin = () =>
+  ViewPlugin.fromClass(
+    class {
+      decorations: DecorationSet;
+
+      constructor(view: EditorView) {
+        this.decorations = inlineImages(view);
+      }
+
+      update(update: ViewUpdate) {
+        if (update.docChanged) {
+          this.decorations = inlineImages(update.view);
+        }
+      }
+    },
+    {
+      decorations: (v) => v.decorations,
+    },
+  );