A mutable AST for source code transformation with Python
- Perhaps a Python package
- Java Language Features
- Method reference
- Anonymous class
- Call expressions with type arguments
- ...
- Function-level support for perhaps C/C++
Current implementation requires tree sitter to convert source code to ASTs. because the author is too weak to write a parser.
pip install tree-sitter inflectionAfter installing the tree_sitter package, clone and build parsers for programming languages.
# create a directory to store sources
mkdir tree-sitter
cd tree-sitter
# currently only Java is supported
git clone https://github.com/tree-sitter/tree-sitter-java.git
# return to base directory
cd ..Then build the parsers with
python build_tree_sitter.py tree-sitterWe have unittests that are unfortunately incomplete and unsound.
Test files can be found in ./test. To run all tests,
python run_all_tests.pyTo run a single test,
# python -m unittest tests.test_module.test_class
python -m unittest tests.test_java_expr.TestJavaCallExprExpect outputs like AssertionError: True is not false (no you dont
from tree_sitter import Parser, Language
from mutable_tree.adaptor import JavaAdaptor
# the only transformation visitor available ><💦
from tree_manip.transforms import ForToWhileVisitor
code = """
for (int i = 0; i < 100; ++i) {
for (int j; j < 100; ++j) {
int k = i + j;
System.out.println(k);
}
}
"""
# parse code with tree_sitter
parser = Parser()
parser.set_language(Language('./parser/languages.so', 'java'))
tree = parser.parse(code.encode())
# convert to mutable tree with adaptors
# NOTE: functionality is extremely limited for now
mutable_root = JavaAdaptor.convert_program(tree.root_node)
# transforming all for-loops to while-loops
visitor = ForToWhileVisitor()
new_root = visitor.visit(mutable_root)
# convert trees back to source code
stringifier = JavaStringifier()
# NOTE: does not support indentations
new_code = stringifier.stringify(new_root)
print(new_code)
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