From 5c0ba37eda80d39e6ceca59bb1d5f4942f858995 Mon Sep 17 00:00:00 2001
From: "Somhairle H. Marisol" <muqiu-han@outlook.com>
Date: Thu, 17 Sep 2026 14:32:37 +0800
Subject: chore: establish Strategy Lab source baseline (development, not
 release)

---
 frontend/src/components/CodeEditor.svelte | 104 ++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 frontend/src/components/CodeEditor.svelte

(limited to 'frontend/src/components/CodeEditor.svelte')

diff --git a/frontend/src/components/CodeEditor.svelte b/frontend/src/components/CodeEditor.svelte
new file mode 100644
index 0000000..544a6a4
--- /dev/null
+++ b/frontend/src/components/CodeEditor.svelte
@@ -0,0 +1,104 @@
+<script lang="ts">
+  import { onMount, onDestroy } from 'svelte';
+  import { EditorView, keymap, drawSelection } from '@codemirror/view';
+  import { EditorState, StateEffect } from '@codemirror/state';
+  import { python } from '@codemirror/lang-python';
+  import { indentWithTab } from '@codemirror/commands';
+  import { defaultKeymap, history, historyKeymap } from '@codemirror/commands';
+
+  interface Props {
+    value: string;
+    onInput: (v: string) => void;
+    height?: number;
+    readOnly?: boolean;
+    label?: string;
+  }
+  let { value, onInput, height = 420, readOnly = false, label }: Props = $props();
+
+  let host: HTMLDivElement;
+  let view: EditorView | null = null;
+  let applyingExternal = false;
+  // svelte-ignore state_referenced_locally
+  let handler = onInput;
+  $effect(() => {
+    handler = onInput;
+  });
+
+  const setDoc = StateEffect.define<string>();
+
+  onMount(() => {
+    view = new EditorView({
+      parent: host,
+      state: EditorState.create({
+        doc: value ?? '',
+        extensions: [
+          readOnly ? EditorView.editable.of(false) : [],
+          history(),
+          drawSelection(),
+          keymap.of([...defaultKeymap, ...historyKeymap, indentWithTab]),
+          python(),
+          EditorView.lineWrapping,
+          EditorView.theme({
+            '&': {
+              fontSize: '13px',
+              background: 'var(--surface)',
+              color: 'var(--text)',
+              fontFamily:
+                "ui-monospace, 'SF Mono', Menlo, Consolas, 'Noto Sans Mono CJK SC', monospace"
+            },
+            '.cm-content': { padding: '10px 0', minHeight: `${height}px` },
+            '.cm-scroller': { lineHeight: '1.55' },
+            '&.cm-focused': { outline: 'none' },
+            '.cm-gutters': {
+              background: 'var(--surface)',
+              border: 'none',
+              color: 'var(--text-3)'
+            },
+            '.cm-activeLine': { background: 'var(--surface-2)' },
+            '.cm-activeLineGutter': { background: 'var(--surface-2)' }
+          }),
+          EditorView.updateListener.of((u) => {
+            if (applyingExternal) return;
+            if (u.docChanged) handler(u.state.doc.toString());
+          })
+        ]
+      })
+    });
+    return () => view?.destroy();
+  });
+
+  $effect(() => {
+    if (!view) return;
+    const current = view.state.doc.toString();
+    if (value !== current) {
+      applyingExternal = true;
+      view.dispatch({ changes: { from: 0, to: current.length, insert: value ?? '' } });
+      applyingExternal = false;
+    }
+  });
+
+  $effect(() => {
+    if (view) {
+      if (readOnly) view.contentDOM.setAttribute('aria-readonly', 'true');
+      else view.contentDOM.removeAttribute('aria-readonly');
+    }
+  });
+
+  onDestroy(() => view?.destroy());
+</script>
+
+<div>
+  {#if label}<span class="hint editor-label">{label}</span>{/if}
+  <div bind:this={host} class="cm-host"></div>
+</div>
+
+<style>
+  .cm-host {
+    border: 1px solid var(--border-strong);
+    border-radius: var(--radius);
+    overflow: hidden;
+    background: var(--surface);
+  }
+  .cm-host :global(.cm-editor) { min-height: 60px; }
+  .editor-label { display: block; margin-bottom: 0.25rem; }
+</style>
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