readmes

pyramation · pyramation · commit 5f96edb798d9 · 2025-07-01T01:46:43.000-07:00
diff --git a/README.md b/README.md
@@ -37,6 +37,9 @@ npm install -g @pgsql/cli
 # For programmatic AST construction
 npm install @pgsql/utils
 
+# For programmatic AST visiting/traversal
+npm install @pgsql/traverse
+
 # For protobuf parsing and code generation
 npm install pg-proto-parser
 ```
@@ -123,6 +126,38 @@ const stmt: { SelectStmt: SelectStmt } = t.nodes.selectStmt({
 await deparse(stmt);
 ```
 
+#### Walk/Traverse an AST
+```typescript
+import { walk, NodePath } from '@pgsql/traverse';
+import type { Walker, Visitor } from '@pgsql/traverse';
+
+// Using a simple walker function
+const walker: Walker = (path: NodePath) => {
+  console.log(`Visiting ${path.tag} at path:`, path.path);
+  
+  // Return false to skip traversing children
+  if (path.tag === 'SelectStmt') {
+    return false; // Skip SELECT statement children
+  }
+};
+
+walk(ast, walker);
+
+// Using a visitor object (recommended for multiple node types)
+const visitor: Visitor = {
+  SelectStmt: (path) => {
+    console.log('SELECT statement:', path.node);
+  },
+  RangeVar: (path) => {
+    console.log('Table:', path.node.relname);
+    console.log('Path to table:', path.path);
+    console.log('Parent node:', path.parent?.tag);
+  }
+};
+
+walk(ast, visitor);
+```
+
 ## 📦 Packages 
 
 | Package | Description | Key Features |
@@ -133,7 +168,7 @@ await deparse(stmt);
 | [**@pgsql/utils**](./packages/utils) | Type-safe AST node creation utilities | • Programmatic AST construction<br>• Runtime Schema<br>• Seamless integration with types |
 | [**pg-proto-parser**](./packages/proto-parser) | PostgreSQL protobuf parser and code generator | • Generate TypeScript interfaces from protobuf<br>• Create enum mappings and utilities<br>• AST helper generation |
 | [**@pgsql/transform**](./packages/transform) | Multi-version PostgreSQL AST transformer | • Transform ASTs between PostgreSQL versions (13→17)<br>• Single source of truth deparser pipeline<br>• Backward compatibility for legacy SQL |
-
+| [**@pgsql/traverse**](./packages/traverse) | PostgreSQL AST traversal utilities | • Visitor pattern for traversing PostgreSQL AST nodes<br>• NodePath context with parent/path information<br>• Runtime schema-based precise traversal |
 
 ## 🛠️ Development
 
@@ -226,6 +261,7 @@ console.log(await deparse(query));
 * [@pgsql/types](https://www.npmjs.com/package/@pgsql/types): Offers TypeScript type definitions for PostgreSQL AST nodes, facilitating type-safe construction, analysis, and manipulation of ASTs.
 * [@pgsql/enums](https://www.npmjs.com/package/@pgsql/enums): Provides TypeScript enum definitions for PostgreSQL constants, enabling type-safe usage of PostgreSQL enums and constants in your applications.
 * [@pgsql/utils](https://www.npmjs.com/package/@pgsql/utils): A comprehensive utility library for PostgreSQL, offering type-safe AST node creation and enum value conversions, simplifying the construction and manipulation of PostgreSQL ASTs.
+* [@pgsql/traverse](https://www.npmjs.com/package/@pgsql/traverse): PostgreSQL AST traversal utilities for pgsql-parser, providing a visitor pattern for traversing PostgreSQL Abstract Syntax Tree nodes, similar to Babel's traverse functionality but specifically designed for PostgreSQL AST structures.
 * [pg-proto-parser](https://www.npmjs.com/package/pg-proto-parser): A TypeScript tool that parses PostgreSQL Protocol Buffers definitions to generate TypeScript interfaces, utility functions, and JSON mappings for enums.
 * [libpg-query](https://github.com/launchql/libpg-query-node): The real PostgreSQL parser exposed for Node.js, used primarily in `pgsql-parser` for parsing and deparsing SQL queries.
 
diff --git a/packages/deparser/README.md b/packages/deparser/README.md
@@ -155,6 +155,7 @@ Built on the excellent work of several contributors:
 * [@pgsql/types](https://www.npmjs.com/package/@pgsql/types): Offers TypeScript type definitions for PostgreSQL AST nodes, facilitating type-safe construction, analysis, and manipulation of ASTs.
 * [@pgsql/enums](https://www.npmjs.com/package/@pgsql/enums): Provides TypeScript enum definitions for PostgreSQL constants, enabling type-safe usage of PostgreSQL enums and constants in your applications.
 * [@pgsql/utils](https://www.npmjs.com/package/@pgsql/utils): A comprehensive utility library for PostgreSQL, offering type-safe AST node creation and enum value conversions, simplifying the construction and manipulation of PostgreSQL ASTs.
+* [@pgsql/traverse](https://www.npmjs.com/package/@pgsql/traverse): PostgreSQL AST traversal utilities for pgsql-parser, providing a visitor pattern for traversing PostgreSQL Abstract Syntax Tree nodes, similar to Babel's traverse functionality but specifically designed for PostgreSQL AST structures.
 * [pg-proto-parser](https://www.npmjs.com/package/pg-proto-parser): A TypeScript tool that parses PostgreSQL Protocol Buffers definitions to generate TypeScript interfaces, utility functions, and JSON mappings for enums.
 * [libpg-query](https://github.com/launchql/libpg-query-node): The real PostgreSQL parser exposed for Node.js, used primarily in `pgsql-parser` for parsing and deparsing SQL queries.
 
diff --git a/packages/parser/README.md b/packages/parser/README.md
@@ -140,11 +140,12 @@ Built on the excellent work of several contributors:
 * [@pgsql/types](https://www.npmjs.com/package/@pgsql/types): Offers TypeScript type definitions for PostgreSQL AST nodes, facilitating type-safe construction, analysis, and manipulation of ASTs.
 * [@pgsql/enums](https://www.npmjs.com/package/@pgsql/enums): Provides TypeScript enum definitions for PostgreSQL constants, enabling type-safe usage of PostgreSQL enums and constants in your applications.
 * [@pgsql/utils](https://www.npmjs.com/package/@pgsql/utils): A comprehensive utility library for PostgreSQL, offering type-safe AST node creation and enum value conversions, simplifying the construction and manipulation of PostgreSQL ASTs.
+* [@pgsql/traverse](https://www.npmjs.com/package/@pgsql/traverse): PostgreSQL AST traversal utilities for pgsql-parser, providing a visitor pattern for traversing PostgreSQL Abstract Syntax Tree nodes, similar to Babel's traverse functionality but specifically designed for PostgreSQL AST structures.
 * [pg-proto-parser](https://www.npmjs.com/package/pg-proto-parser): A TypeScript tool that parses PostgreSQL Protocol Buffers definitions to generate TypeScript interfaces, utility functions, and JSON mappings for enums.
 * [libpg-query](https://github.com/launchql/libpg-query-node): The real PostgreSQL parser exposed for Node.js, used primarily in `pgsql-parser` for parsing and deparsing SQL queries.
 
 ## Disclaimer
 
 AS DESCRIBED IN THE LICENSES, THE SOFTWARE IS PROVIDED "AS IS", AT YOUR OWN RISK, AND WITHOUT WARRANTIES OF ANY KIND.
 
-No developer or entity involved in creating Software will be liable for any claims or damages whatsoever associated with your use, inability to use, or your interaction with other users of the Software code or Software CLI, including any direct, indirect, incidental, special, exemplary, punitive or consequential damages, or loss of profits, cryptocurrencies, tokens, or anything else of value.
+No developer or entity involved in creating Software will be liable for any claims or damages whatsoever associated with your use, inability to use, or your interaction with other users of the Software code or Software CLI, including any direct, indirect, incidental, special, exemplary, punitive or consequential damages, or loss of profits, cryptocurrencies, tokens, or anything else of value.
diff --git a/packages/pgsql-cli/README.md b/packages/pgsql-cli/README.md
@@ -258,11 +258,12 @@ The command options remain largely the same, with some improvements:
 * [@pgsql/types](https://www.npmjs.com/package/@pgsql/types): Offers TypeScript type definitions for PostgreSQL AST nodes, facilitating type-safe construction, analysis, and manipulation of ASTs.
 * [@pgsql/enums](https://www.npmjs.com/package/@pgsql/enums): Provides TypeScript enum definitions for PostgreSQL constants, enabling type-safe usage of PostgreSQL enums and constants in your applications.
 * [@pgsql/utils](https://www.npmjs.com/package/@pgsql/utils): A comprehensive utility library for PostgreSQL, offering type-safe AST node creation and enum value conversions, simplifying the construction and manipulation of PostgreSQL ASTs.
+* [@pgsql/traverse](https://www.npmjs.com/package/@pgsql/traverse): PostgreSQL AST traversal utilities for pgsql-parser, providing a visitor pattern for traversing PostgreSQL Abstract Syntax Tree nodes, similar to Babel's traverse functionality but specifically designed for PostgreSQL AST structures.
 * [pg-proto-parser](https://www.npmjs.com/package/pg-proto-parser): A TypeScript tool that parses PostgreSQL Protocol Buffers definitions to generate TypeScript interfaces, utility functions, and JSON mappings for enums.
 * [libpg-query](https://github.com/launchql/libpg-query-node): The real PostgreSQL parser exposed for Node.js, used primarily in `pgsql-parser` for parsing and deparsing SQL queries.
 
 ## Disclaimer
 
 AS DESCRIBED IN THE LICENSES, THE SOFTWARE IS PROVIDED "AS IS", AT YOUR OWN RISK, AND WITHOUT WARRANTIES OF ANY KIND.
 
-No developer or entity involved in creating Software will be liable for any claims or damages whatsoever associated with your use, inability to use, or your interaction with other users of the Software code or Software CLI, including any direct, indirect, incidental, special, exemplary, punitive or consequential damages, or loss of profits, cryptocurrencies, tokens, or anything else of value.
+No developer or entity involved in creating Software will be liable for any claims or damages whatsoever associated with your use, inability to use, or your interaction with other users of the Software code or Software CLI, including any direct, indirect, incidental, special, exemplary, punitive or consequential damages, or loss of profits, cryptocurrencies, tokens, or anything else of value.
diff --git a/packages/proto-parser/README.md b/packages/proto-parser/README.md
@@ -323,6 +323,7 @@ t.nodes.selectStmt({
 * [@pgsql/types](https://www.npmjs.com/package/@pgsql/types): Offers TypeScript type definitions for PostgreSQL AST nodes, facilitating type-safe construction, analysis, and manipulation of ASTs.
 * [@pgsql/enums](https://www.npmjs.com/package/@pgsql/enums): Provides TypeScript enum definitions for PostgreSQL constants, enabling type-safe usage of PostgreSQL enums and constants in your applications.
 * [@pgsql/utils](https://www.npmjs.com/package/@pgsql/utils): A comprehensive utility library for PostgreSQL, offering type-safe AST node creation and enum value conversions, simplifying the construction and manipulation of PostgreSQL ASTs.
+* [@pgsql/traverse](https://www.npmjs.com/package/@pgsql/traverse): PostgreSQL AST traversal utilities for pgsql-parser, providing a visitor pattern for traversing PostgreSQL Abstract Syntax Tree nodes, similar to Babel's traverse functionality but specifically designed for PostgreSQL AST structures.
 * [pg-proto-parser](https://www.npmjs.com/package/pg-proto-parser): A TypeScript tool that parses PostgreSQL Protocol Buffers definitions to generate TypeScript interfaces, utility functions, and JSON mappings for enums.
 * [libpg-query](https://github.com/launchql/libpg-query-node): The real PostgreSQL parser exposed for Node.js, used primarily in `pgsql-parser` for parsing and deparsing SQL queries.
 
diff --git a/packages/transform/README.md b/packages/transform/README.md
@@ -123,6 +123,7 @@ This enables a single source of truth for SQL generation while supporting legacy
 * [@pgsql/types](https://www.npmjs.com/package/@pgsql/types): Offers TypeScript type definitions for PostgreSQL AST nodes, facilitating type-safe construction, analysis, and manipulation of ASTs.
 * [@pgsql/enums](https://www.npmjs.com/package/@pgsql/enums): Provides TypeScript enum definitions for PostgreSQL constants, enabling type-safe usage of PostgreSQL enums and constants in your applications.
 * [@pgsql/utils](https://www.npmjs.com/package/@pgsql/utils): A comprehensive utility library for PostgreSQL, offering type-safe AST node creation and enum value conversions, simplifying the construction and manipulation of PostgreSQL ASTs.
+* [@pgsql/traverse](https://www.npmjs.com/package/@pgsql/traverse): PostgreSQL AST traversal utilities for pgsql-parser, providing a visitor pattern for traversing PostgreSQL Abstract Syntax Tree nodes, similar to Babel's traverse functionality but specifically designed for PostgreSQL AST structures.
 * [pg-proto-parser](https://www.npmjs.com/package/pg-proto-parser): A TypeScript tool that parses PostgreSQL Protocol Buffers definitions to generate TypeScript interfaces, utility functions, and JSON mappings for enums.
 * [libpg-query](https://github.com/launchql/libpg-query-node): The real PostgreSQL parser exposed for Node.js, used primarily in `pgsql-parser` for parsing and deparsing SQL queries.
 
diff --git a/packages/traverse/README.md b/packages/traverse/README.md
@@ -23,9 +23,9 @@ npm install @pgsql/traverse
 
 ## Usage
 
-### New Walk API (Recommended)
+### Walk API (Recommended)
 
-The new `walk` function provides improved traversal with NodePath context and early return support:
+The `walk` function provides improved traversal with NodePath context and early return support:
 
 ```typescript
 import { walk, NodePath } from '@pgsql/traverse';
@@ -78,7 +78,7 @@ class NodePath<TTag extends NodeTag = NodeTag> {
 
 The new implementation uses PostgreSQL's runtime schema to precisely determine which fields contain Node types that need traversal, eliminating guesswork and improving accuracy.
 
-### Legacy Visit API (Backward Compatible)
+### Visit API
 
 The original `visit` function is still available for backward compatibility:
 
@@ -303,6 +303,7 @@ visit(ast, visitor);
 * [@pgsql/types](https://www.npmjs.com/package/@pgsql/types): Offers TypeScript type definitions for PostgreSQL AST nodes, facilitating type-safe construction, analysis, and manipulation of ASTs.
 * [@pgsql/enums](https://www.npmjs.com/package/@pgsql/enums): Provides TypeScript enum definitions for PostgreSQL constants, enabling type-safe usage of PostgreSQL enums and constants in your applications.
 * [@pgsql/utils](https://www.npmjs.com/package/@pgsql/utils): A comprehensive utility library for PostgreSQL, offering type-safe AST node creation and enum value conversions, simplifying the construction and manipulation of PostgreSQL ASTs.
+* [@pgsql/traverse](https://www.npmjs.com/package/@pgsql/traverse): PostgreSQL AST traversal utilities for pgsql-parser, providing a visitor pattern for traversing PostgreSQL Abstract Syntax Tree nodes, similar to Babel's traverse functionality but specifically designed for PostgreSQL AST structures.
 * [pg-proto-parser](https://www.npmjs.com/package/pg-proto-parser): A TypeScript tool that parses PostgreSQL Protocol Buffers definitions to generate TypeScript interfaces, utility functions, and JSON mappings for enums.
 * [libpg-query](https://github.com/launchql/libpg-query-node): The real PostgreSQL parser exposed for Node.js, used primarily in `pgsql-parser` for parsing and deparsing SQL queries.
 
