human-oriented ast parser/unparser
Project description
Attempt at a human-oriented abstract syntax tree (AST) parser/unparser for Python 3.
This package provides new AST node types which inherit from nodes in typed_ast.ast3 module. Additionally, it provides implementation of parser and unparser for the extended ASTs.
Simple example of how to use this package:
from horast import parse, unparse
tree = parse("""a = 1 # a equals one after this""")
print(unparse(tree))
# this will print the code with original commentMore examples in examples.ipynb.
technical details
Parser is based on built-in tokenize module, as well as community packages asttokens and typed_ast.
Unparser is essentially an extension of Unparser class from static_typing package.
Nodes provided and handled by horast are listed below.
Comment
Full line as well as end-of-line comments are parsed/unparsed correctly when they are outside of multi-line expressions.
Currently, handling of comments within multi-line expressions is implemented only partially.
Docstring
To do.
Directive
This node will not appear in AST when Python code is parsed, and if inserted into AST manually, it will be rendered as comment.
This node is not meant to enable preprocessing of Python, at least for now.
Currently, this node is meant to work towards AST compatibility between Python and other langauges, to aide code generation from Python AST into code in other langauges (as seen in *transpyle* project).
requirements
CPython 3.5 or later.
Python libraries as specified in requirements.txt.
Building and running tests additionally requires packages listed in test_requirements.txt.
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