add yaml language support

packages/yaml/README.md

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+# ast-grep napi language for yaml
+
+## Installation
+
+In a pnpm project, run:
+
+```bash
+pnpm install @ast-grep/lang-yaml
+pnpm install @ast-grep/napi
+# install the tree-sitter-cli if no prebuild is available
+pnpm install @tree-sitter/cli --save-dev
+```
+
+## Usage
+
+```js
+import yaml from '@ast-grep/lang-yaml'
+import { registerDynamicLanguage, parse } from '@ast-grep/napi'
+
+registerDynamicLanguage({ yaml })
+
+const sg = parse('yaml', `your code`)
+sg.root().kind()
+```

packages/yaml/index.d.ts

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+type LanguageRegistration = {
+  libraryPath: string
+  extensions: string[]
+  languageSymbol?: string
+  metaVarChar?: string
+  expandoChar?: string
+}
+
+declare const registration: LanguageRegistration
+export default registration

packages/yaml/index.js

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+const path = require('node:path')
+const libPath = path.join(__dirname, 'parser.so')
+
+module.exports = {
+  libraryPath: libPath,
+  extensions: ['yaml', 'yml'],
+  languageSymbol: 'tree_sitter_yaml',
+  expandoChar: '$',
+}

packages/yaml/nursery.js

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+const { setup } = require('@ast-grep/nursery')
+const assert = require('node:assert')
+const languageRegistration = require('./index')
+
+setup({
+  dirname: __dirname,
+  name: 'yaml',
+  treeSitterPackage: '@tree-sitter-grammars/tree-sitter-yaml',
+  languageRegistration,
+  testRunner: parse => {
+    // Based on test_yaml_str
+    let sg = parse('123')
+    let node = sg.root().find('123')
+    assert.ok(node, 'should match simple scalar')
+    node = sg.root().find("'123'")
+    assert.ok(!node, 'should not match quoted scalar')
+
+    // Based on test_yaml_pattern
+    sg = parse('foo: 123')
+    node = sg.root().find('foo: $BAR')
+    assert.ok(node, 'should match key-value with metavariable')
+    let match = node.getMatch('BAR')
+    assert.equal(match.text(), '123')
+
+    sg = parse('foo: [1, 2, 3]')
+    node = sg.root().find('foo: $$$')
+    assert.ok(node, 'should match key-list with multi-metavariable')
+
+    sg = parse(`foo:
+      - a`)
+    node = sg.root().find('foo: $BAR')
+    assert.ok(node, 'should match key-sequence with metavariable')
+    match = node.getMatch('BAR')
+    assert.equal(match.kind(), 'block_node') // Updated expected kind
+
+    sg = parse('bar: bar')
+    node = sg.root().find('foo: $BAR')
+    assert.ok(!node, 'should not match incorrect key')
+
+    // Based on test_yaml_replace (testing find, as replace is not directly available)
+    const SOURCE = `
+key: value
+list:
+  - item1
+  - item2
+`
+    sg = parse(SOURCE)
+    node = sg.root().find('$KEY: value')
+    assert.ok(node, 'should find key-value pair for replacement test')
+    match = node.getMatch('KEY')
+    assert.equal(match.text(), 'key')
+  },
+})

packages/yaml/package.json

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+{
+  "name": "@ast-grep/lang-yaml",
+  "version": "0.0.1",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "build": "tree-sitter build -o parser.so",
+    "source": "node nursery.js source",
+    "prepublishOnly": "node nursery.js source",
+    "postinstall": "node postinstall.js",
+    "test": "node nursery.js test"
+  },
+  "files": [
+    "index.js",
+    "index.d.ts",
+    "type.d.ts",
+    "postinstall.js",
+    "src",
+    "prebuilds"
+  ],
+  "keywords": ["ast-grep", "ast-grep-lang"],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@ast-grep/setup-lang": "0.0.3"
+  },
+  "peerDependencies": {
+    "tree-sitter-cli": "0.24.6"
+  },
+  "peerDependenciesMeta": {
+    "tree-sitter-cli": {
+      "optional": true
+    }
+  },
+  "devDependencies": {
+    "@ast-grep/nursery": "0.0.2",
+    "@tree-sitter-grammars/tree-sitter-yaml": "0.7.0",
+    "tree-sitter-cli": "0.24.6"
+  },
+  "publishConfig": {
+    "access": "public",
+    "registry": "https://registry.npmjs.org/"
+  },
+  "pnpm": {
+    "onlyBuiltDependencies": ["@ast-grep/lang-yaml", "tree-sitter-cli"]
+  }
+}

packages/yaml/postinstall.js

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+const { postinstall } = require('@ast-grep/setup-lang')
+postinstall({
+  dirname: __dirname,
+})