Add project-aware playground completion

packages/decodal-codemirror/package-lock.json

@@ -10,6 +10,7 @@
       "license": "MIT OR Apache-2.0",
       "devDependencies": {
         "@codemirror/language": "^6.12.4",
+        "@codemirror/state": "^6.7.1",
         "@codemirror/view": "^6.43.6",
         "@lezer/highlight": "^1.2.3",
         "@lezer/lr": "^1.4.10"

packages/decodal-codemirror/package.json

@@ -9,6 +9,9 @@
     "url": "git+https://gitea.hareworks.net/Hare/Decodal.git",
     "directory": "packages/decodal-codemirror"
   },
+  "scripts": {
+    "test": "node --test src/*.test.mjs"
+  },
   "exports": {
     ".": {
       "types": "./src/decodal.d.ts",
@@ -44,6 +47,7 @@
   },
   "devDependencies": {
     "@codemirror/language": "^6.12.4",
+    "@codemirror/state": "^6.7.1",
     "@codemirror/view": "^6.43.6",
     "@lezer/highlight": "^1.2.3",
     "@lezer/lr": "^1.4.10"

packages/decodal-codemirror/src/decodal.js

@@ -1,4 +1,4 @@
-import { LRLanguage, LanguageSupport, HighlightStyle, syntaxHighlighting, foldNodeProp, indentNodeProp } from '@codemirror/language';
+import { LRLanguage, LanguageSupport, HighlightStyle, syntaxHighlighting, delimitedIndent, foldNodeProp, indentNodeProp } from '@codemirror/language';
 import { styleTags, tags as t } from '@lezer/highlight';
 import { parser } from './decodal-parser.js';
 
@@ -19,10 +19,10 @@ const parserWithMetadata = parser.configure({
       'Semicolon Comma Dot Colon': t.punctuation,
     }),
     indentNodeProp.add({
-      Object: context => context.column(context.node.from) + context.unit,
-      Array: context => context.column(context.node.from) + context.unit,
-      ArrayConstraint: context => context.column(context.node.from) + context.unit,
-      MatchExpression: context => context.column(context.node.from) + context.unit,
+      Object: delimitedIndent({ closing: '}', align: false }),
+      Array: delimitedIndent({ closing: ']', align: false }),
+      ArrayConstraint: delimitedIndent({ closing: ']', align: false }),
+      MatchExpression: delimitedIndent({ closing: '}', align: false }),
       LetExpression: context => context.column(context.node.from) + context.unit,
     }),
     foldNodeProp.add({

packages/decodal-codemirror/src/decodal.test.mjs

@@ -0,0 +1,35 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+
+import { getIndentation, indentUnit } from '@codemirror/language';
+import { EditorState } from '@codemirror/state';
+
+import { decodal } from './decodal.js';
+
+function indentationAt(doc, lineNumber) {
+  const state = EditorState.create({
+    doc,
+    extensions: [decodal(), indentUnit.of('  ')],
+  });
+  return getIndentation(state, state.doc.line(lineNumber).from);
+}
+
+test('indents an inline object from its containing line', () => {
+  const doc = `hoge = fuga & piyo & {
+
+}`;
+
+  assert.equal(indentationAt(doc, 2), 2);
+  assert.equal(indentationAt(doc, 3), 0);
+});
+
+test('preserves the surrounding indentation for a nested inline object', () => {
+  const doc = `root = {
+  hoge = fuga & piyo & {
+
+  };
+};`;
+
+  assert.equal(indentationAt(doc, 3), 4);
+  assert.equal(indentationAt(doc, 4), 2);
+});

packages/decodal-codemirror/src/mod.ts

@@ -8,7 +8,7 @@
  *
  * @module
  */
-import { HighlightStyle, LRLanguage, LanguageSupport, foldNodeProp, indentNodeProp, syntaxHighlighting } from 'npm:@codemirror/language@^6.12.4';
+import { HighlightStyle, LRLanguage, LanguageSupport, delimitedIndent, foldNodeProp, indentNodeProp, syntaxHighlighting } from 'npm:@codemirror/language@^6.12.4';
 import { styleTags, tags as t } from 'npm:@lezer/highlight@^1.2.3';
 import { parser } from './decodal-parser-jsr.js';
 
@@ -29,10 +29,10 @@ const parserWithMetadata = parser.configure({
       'Semicolon Comma Dot Colon': t.punctuation,
     }),
     indentNodeProp.add({
-      Object: context => context.column(context.node.from) + context.unit,
-      Array: context => context.column(context.node.from) + context.unit,
-      ArrayConstraint: context => context.column(context.node.from) + context.unit,
-      MatchExpression: context => context.column(context.node.from) + context.unit,
+      Object: delimitedIndent({ closing: '}', align: false }),
+      Array: delimitedIndent({ closing: ']', align: false }),
+      ArrayConstraint: delimitedIndent({ closing: ']', align: false }),
+      MatchExpression: delimitedIndent({ closing: '}', align: false }),
       LetExpression: context => context.column(context.node.from) + context.unit,
     }),
     foldNodeProp.add({