php-parser-py 1.0.0

Python wrapper for PHP-Parser using cpg2py

php-parser-py

Python wrapper for PHP-Parser using cpg2py's graph framework.

Overview

php-parser-py provides a Python interface to PHP-Parser, enabling Abstract Syntax Tree (AST) parsing and manipulation of PHP code. The library integrates with cpg2py's graph framework for powerful graph-based code analysis.

Features

• Native PHP-Parser Integration: Delegates all parsing and code generation to PHP-Parser for maximum compatibility
• Zero-Configuration PHP: Bundled PHP binaries via static-php-py - no system PHP installation required
• Graph-Based Analysis: Uses cpg2py's graph framework for AST traversal and querying
• Dynamic Node Types: No hardcoded PHP node types - all types come from PHP-Parser's JSON output
• Lossless Round-Trip: Parse → Modify → Generate code with full fidelity
• Cross-Platform Support: Pre-built PHP 8.4 binaries for Linux (x86_64/aarch64), macOS (x86_64/arm64), and Windows (x64)

Installation

pip install php-parser-py

Note: Platform-specific wheels include pre-built PHP 8.4 binaries. No separate PHP installation required!

Quick Start

Parse PHP Code (Without Project Structure)

from php_parser_py import parse_code

# Parse PHP code into raw statement nodes
code = """<?php
function greet($name) {
    echo "Hello, $name!";
}
"""

nodes = parse_code(code)
# Returns list of Node instances (no project/file structure)

for node in nodes:
    print(f"Node type: {node.label}")

Parse PHP File (With Project Structure)

from php_parser_py import parse_file

# Parse a single file with project/file structure
ast = parse_file("example.php")

# Access project and file nodes
project = ast.project_node
files = ast.files()
print(f"Project has {len(files)} file(s)")

# Get file containing a specific node
stmt_node = ast.first_node(lambda n: n.label == "Stmt_Function")
file_node = ast.get_file(stmt_node.id)
print(f"Function is in file: {file_node.get_property('filePath')}")

Parse Multiple Files (Project Structure)

from php_parser_py import parse_project

# Parse multiple files into a single AST
ast = parse_project(["file1.php", "file2.php", "file3.php"])

# Access all files
for file_node in ast.files():
    print(f"File: {file_node.get_property('filePath')}")
    # Get statements in this file
    for stmt in ast.children(file_node):
        print(f"  Statement: {stmt.label}")

# Access project and file paths
ast = parse_project(["file1.php", "subdir/file2.php"])
project = ast.project_node
print(f"Project root: {project.get_property('path')}")

for file_node in ast.files():
    print(f"File relative path: {file_node.get_property('path')}")
    print(f"File absolute path: {file_node.get_property('filePath')}")

Traverse AST

from php_parser_py import parse_file

ast = parse_file("example.php")

# Find all echo statements
for echo in ast.nodes(lambda n: n.label == "Stmt_Echo"):
    print(f"Echo at line {echo.get_property('startLine')}")

# Get children of a node (via PARENT_OF edges)
for child in ast.succ(some_node):
    print(f"Child type: {child.label}")

# Get all descendants
for descendant in ast.descendants(some_node):
    print(f"Descendant: {descendant.label}")

# Get file containing a node
stmt_node = ast.first_node(lambda n: n.label == "Stmt_Function")
file_node = ast.get_file(stmt_node.id)
if file_node:
    print(f"Function is in: {file_node.get_property('filePath')}")

# Access project structure
project = ast.project_node
files = ast.files()
for file_node in files:
    print(f"File: {file_node.get_property('filePath')}")

Generate PHP Code

from php_parser_py import parse_file, parse_project, PrettyPrinter

# Parse single file
ast = parse_file("example.php")

# Generate code (returns dict mapping file paths to code)
printer = PrettyPrinter()
generated = printer.print(ast)
for file_path, code in generated.items():
    print(f"File: {file_path}")
    print(code)

# Parse multiple files
ast = parse_project(["file1.php", "file2.php"])

# Generate code for all files
generated = printer.print(ast)
# Returns: {"file1.php": "...", "file2.php": "..."}

Advanced Usage

Custom PHP Binary

If you need to use a specific PHP version or custom binary:

from php_parser_py import Parser
from pathlib import Path

# Use local PHP binary
parser = Parser(php_binary_path=Path("/usr/local/bin/php"))
ast = parser.parse("<?php echo 'hello';")

# Or download from remote URL
parser = Parser(php_binary_url="https://example.com/php-8.4.zip")
ast = parser.parse("<?php echo 'hello';")

API Reference

Main Functions

• parse_code(code: str) -> list[Node]: Parse PHP code string into raw statement nodes (no project/file structure)
• parse(code: str) -> AST: Parse PHP code string and return AST with project/file structure (backward compatibility)
• parse_file(path: str) -> AST: Parse a single PHP file and return AST with project/file structure
• parse_project(paths: list[str]) -> AST: Parse multiple PHP files into a single AST with project structure

Classes

• AST: Represents the complete AST as a graph

  • node(id): Get node by ID
  • nodes(predicate): Iterate nodes matching predicate
  • first_node(predicate): Get first matching node
  • succ(node, predicate): Get successor nodes (children via PARENT_OF edges)
  • prev(node, predicate): Get predecessor nodes (parents via PARENT_OF edges)
  • descendants(node, predicate): Get all descendants via BFS
  • ancestors(node, predicate): Get all ancestors via BFS
  • root_node: Property returning the root/project node
  • project_node: Property returning the project node (alias for root_node)
  • files(): Get all file nodes in the project
  • get_file(node_id): Get the file node containing the given node
  • to_json(): Reconstruct PHP-Parser JSON

• Node: Wraps a single AST node

  • id: Node identifier
  • label: Node type (e.g., "Stmt_Function")
  • node_type: Alias for label (PHP-Parser node type)
  • properties: All node properties
  • get_property(*names): Get property value

• Parser: Parses PHP code

  • __init__(php_binary_path=None, php_binary_url=None): Initialize parser
    • php_binary_path: Optional path to local PHP binary
    • php_binary_url: Optional URL to download PHP binary from
  • parse_code(code): Parse code string into list of nodes
  • parse(code): Parse code string into AST (backward compatibility)
  • parse_file(path): Parse file into AST with project/file structure
  • parse_project(paths): Parse multiple files into AST with project structure

• PrettyPrinter: Generates PHP code

  • __init__(php_binary_path=None, php_binary_url=None): Initialize printer
    • php_binary_path: Optional path to local PHP binary
    • php_binary_url: Optional URL to download PHP binary from
  • print(ast) -> dict[str, str]: Generate code from AST, returns dictionary mapping file paths to generated code
    • Returns: {file_path: code_string, ...} for each file in the AST
    • If AST has no file structure, returns {"": code_string}

Exceptions

• ParseError: Raised when PHP-Parser reports syntax error
• RunnerError: Raised when PHP execution fails

AST Structure

The library supports three parsing modes:

1. Code Parsing (parse_code): Returns flat list of statement nodes

   • Node IDs: node_1, node_2, ...
   • No project/file structure

2. File Parsing (parse_file): Creates project → file → statements hierarchy

   • Project node: "project" (fixed ID)
   • File node: 8-character hex hash (e.g., "a1b2c3d4")
   • Statement nodes: {hex}_1, {hex}_2, ...

3. Project Parsing (parse_project): Creates project → multiple files → statements hierarchy

   • Single project node: "project" (fixed ID)
   • Multiple file nodes: Each with unique hex hash
   • Statement nodes: Prefixed with their file's hash

Architecture

The library follows a delegation-based architecture:

1. PHP-Parser handles all parsing and code generation
2. cpg2py Storage stores the AST as a graph
3. Python classes provide convenient access to the graph

This design ensures:

• No need to maintain PHP node type definitions in Python
• Automatic compatibility with PHP-Parser updates
• Full access to PHP-Parser's features
• Support for multi-file project analysis with merge capabilities

Requirements

• Python >= 3.11
• cpg2py
• static-php-py (bundled PHP binaries)

License

MIT License - see LICENSE file for details.

Documentation

For detailed design documentation, see:

• Design Document
• Idea Document
• API Demo