feat: subscript access, setter methods, def self.method, heredoc fix

CHANGELOG.md

@@ -0,0 +1,59 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+This project follows [Semantic Versioning](https://semver.org/).
+
+## [0.2.0] - 2026-03-26
+
+### Added
+
+- **Comprehensive indentation** — 119 programmatic tests covering all Ruby indent/dedent patterns:
+  - Block openers (def, class, module, if, unless, while, until, for, case, begin, do, braces)
+  - Mid-block keywords (else, elsif, when, rescue, ensure)
+  - Closing delimiters (}, ], ))
+  - Continuation lines (trailing +, -, &&, ||, \, comma)
+  - Method chaining with leading dots
+  - Assignment with block openers (`x = if`, `@foo ||= begin`)
+  - Modifier forms and single-line bodies (no indent change)
+  - Nested blocks at arbitrary depth
+- **Subscript expressions** — `arr[0]`, `hash[:key]`, `matrix[i][j]`
+- **Subscript assignment** — `hash[:key] = value`
+- **Setter method definitions** — `def name=(value)`
+- **Class method definitions** — `def self.method_name`
+- Tab key support in demo editor
+- Cmd+Shift+Enter inserts properly indented line above in demo editor
+
+### Fixed
+
+- Single-line forms (`class Foo; end`, `def foo; end`, endless methods) no longer incorrectly indent the next line
+- `end`, `else`, `elsif`, `when`, `rescue`, `ensure` correctly deindent to match their opening keyword at any nesting depth
+- Empty lines inside blocks preserve surrounding indent context
+- Closing delimiters align with their matching opener
+
+### Changed
+
+- Indentation engine rewritten from tree-based `indentNodeProp` to text-based `indentService` for robust handling of incomplete code while typing
+- Updated parse accuracy benchmarks with larger, more representative real-world files
+
+## [0.1.0] - 2026-03-26
+
+### Added
+
+- Initial release
+- Lezer grammar for Ruby with 89 grammar tests
+- **Definitions**: methods (with params, endless `def f(x) = expr`), classes (with inheritance), modules
+- **Control flow**: if/elsif/else, unless, while, until, for/in, case/when, case/in (pattern matching)
+- **Error handling**: begin/rescue/ensure/raise
+- **Strings**: single-quoted, double-quoted with `#{interpolation}`, heredocs (`<<~DELIM`), `%`-literals
+- **Literals**: integers, floats, symbols, character literals, arrays, hashes, regex, nil, true, false
+- **Expressions**: assignment (including `||=`, `&&=`), multiple assignment, method calls, chained calls, binary/unary/ternary operators, lambdas, ranges, conditional modifiers
+- **Blocks**: brace blocks and do/end blocks attached to method calls
+- **Operators**: proper precedence, safe navigation (`&.`), scope resolution (`::`)
+- **Bare method calls**: 25 common Ruby methods (puts, require, attr_reader, include, etc.)
+- **Variables**: local, @instance, @@class, $global, Constants
+- **Comments**: line `#` and block `=begin`/`=end`
+- 5 external tokenizers for context-dependent tokens (regex/division, heredoc/less-than, percent-literal/modulo, symbol/colon, string interpolation)
+- Code folding, bracket closing, keyword autocompletion (31 keywords)
+- Demo page with One Dark theme
+- GitHub Actions CI

README.md

@@ -25,17 +25,17 @@ new EditorView({
 
 ## Real-world parse accuracy
 
-Tested against popular open source Ruby projects:
-
-| Project | Stars | Lines | Accuracy |
-|---------|-------|-------|----------|
-| [Rails](https://github.com/rails/rails) | 56k | 338 | **99.7%** |
-| [Jekyll](https://github.com/jekyll/jekyll) | 49k | 196 | **99.6%** |
-| [Fastlane](https://github.com/fastlane/fastlane) | 40k | 54 | **99.3%** |
-| [Devise](https://github.com/heartcombo/devise) | 24k | 534 | **98.0%** |
-| [Faker](https://github.com/faker-ruby/faker) | 11k | 282 | **97.5%** |
-| [Sidekiq](https://github.com/sidekiq/sidekiq) | 13k | 162 | **97.5%** |
-| [Grape](https://github.com/ruby-grape/grape) | 10k | 75 | **95.3%** |
+Tested against popular open source Ruby projects (large, representative files):
+
+| Project | File | Lines | Accuracy |
+|---------|------|-------|----------|
+| [Fastlane](https://github.com/fastlane/fastlane) | runner.rb | 379 | **91.3%** |
+| [Grape](https://github.com/ruby-grape/grape) | api.rb | 166 | **90.1%** |
+| [Jekyll](https://github.com/jekyll/jekyll) | site.rb | 577 | **88.4%** |
+| [Devise](https://github.com/heartcombo/devise) | devise.rb | 534 | **87.9%** |
+| [Sidekiq](https://github.com/sidekiq/sidekiq) | config.rb | 321 | **87.5%** |
+| [Rails](https://github.com/rails/rails) | query_methods.rb | 2291 | **86.6%** |
+| [Faker](https://github.com/faker-ruby/faker) | internet.rb | 579 | **85.3%** |
 
 ## What's supported
 
@@ -50,21 +50,22 @@ Tested against popular open source Ruby projects:
 - **Bare method calls**: `puts "hello"`, `require "json"`, `attr_reader :name`, `include Comparable` (25 common Ruby methods)
 - **Variables**: local, `@instance`, `@@class`, `$global`, `Constants`
 - **Comments**: line `#` and block `=begin`/`=end`
-- **Editor features**: indentation, code folding, bracket closing, keyword autocompletion (31 keywords)
+- **Editor features**: smart indentation (119 test cases), code folding, bracket closing, keyword autocompletion (31 keywords)
 
 ## Known limitations
 
+- Blank lines inside class/method bodies can produce spurious error nodes (~38% of parse errors)
+- Multi-arg bare method calls (`raise ArgumentError, "msg"`) not fully supported
+- Compound assignment operators (`+=`, `-=`, `|=`) in some contexts
 - Heredoc and `%`-literal bodies are opaque tokens (no interpolation highlighting inside)
-- Hash symbol-key shorthand (`{ name: "Alice" }`) not supported (`:` conflicts with Symbol token when blocks are expressions)
-- Setter method definitions (`def name=(val)`) and subscript access (`arr[0]`) not yet supported
 - `<<` left-shift operator not distinguished from heredoc start
 
 ## Development
 
 ```bash
 npm install          # Install dependencies
 npm run build        # Build grammar + bundle to dist/
-npm test             # Run all 83 grammar tests
+npm test             # Run all 89 grammar tests
 npm run lint         # TypeScript type check
 npm run demo:build   # Build the demo page
 ```

demo/demo.ts

@@ -1,4 +1,7 @@
 import {EditorView, basicSetup} from "codemirror"
+import {keymap} from "@codemirror/view"
+import {indentWithTab} from "@codemirror/commands"
+import {getIndentation} from "@codemirror/language"
 import {oneDark} from "@codemirror/theme-one-dark"
 import {ruby} from "../src/index"
 
@@ -73,6 +76,16 @@ new EditorView({
   doc: sampleCode,
   extensions: [
     basicSetup,
+    keymap.of([
+      indentWithTab,
+      {key: "Mod-Shift-Enter", run: (view) => {
+        const line = view.state.doc.lineAt(view.state.selection.main.head)
+        const indent = getIndentation(view.state, line.from)
+        const pad = indent != null && indent > 0 ? " ".repeat(indent) : ""
+        view.dispatch({changes: {from: line.from, insert: pad + "\n"}, selection: {anchor: line.from + pad.length}})
+        return true
+      }},
+    ]),
     ruby(),
     oneDark,
     EditorView.theme({

package.json

@@ -1,6 +1,6 @@
 {
   "name": "codemirror-lang-ruby",
-  "version": "0.1.0",
+  "version": "0.2.0",
   "description": "Ruby language support for CodeMirror 6, built on a Lezer grammar",
   "type": "module",
   "main": "dist/index.cjs",
@@ -45,8 +45,10 @@
   },
   "devDependencies": {
     "@codemirror/autocomplete": "^6.20.1",
+    "@codemirror/commands": "^6.10.3",
     "@codemirror/language": "^6.0.0",
     "@codemirror/theme-one-dark": "^6.1.3",
+    "@codemirror/view": "^6.40.0",
     "@lezer/common": "^1.0.0",
     "@lezer/generator": "^1.0.0",
     "@lezer/highlight": "^1.0.0",