pyasdl 0.3.1

ASDL Parser

PyASDL

A new ASDL parser for Zephyr's ASDL format.

Stub Generator Example

For understanding the parse tree and the visitors, you can check out the stub generator example. Basically it generates a typing stub for the AST module itself (when the Python's ASDL is given) in a straight forward way.

Reference

• parse(source: str, *, filename: str = "<pyasdl>") -> Module Takes the source code (and optionally the filename, to be used in syntax errors) and outputs an pyasdl.Module instance that represents the AST of the given ASDL schema.

• ASDLVisitor A base class to be used with visitor-pattern applications. The interface is similiar with the ast.NodeVisitor.

  import pyasdl as asdl
  
  class CollectNamesVisitor(asdl.ASDLVisitor):
      def __init__(self):
          self.names = set()
  
      def visit_Module(self, node: asdl.Module) -> None:
          self.names.add(node.name)
  
  visitor = DummyVisitor()
  for source in sources:
      tree = asdl.parse(source)
      visitor.visit(tree)
  print(visitor.names)
  

• Module

• Type

• Sum

• Constructor

• FieldQualifier

• Field