A light-weight, Extendable, high level, universal code parser built on top of tree-sitter
Project description
tree-hugger
Mining source code repositories at scale easily. Tree-hugger is a light-weight, high level library which provides Pythonic APIs to mine recursively trough Github repositories. Tree-hugger is built on top of tree-sitter.
Covered languages:
- Python
- PHP
- Java
- JavaScript
- C++
System Requirement: Python 3.6
Contents
Installation
From pip:
pip install tree-hugger
From Source:
git clone https://github.com/autosoft-dev/tree-hugger.git
cd tree-hugger
pip install -e .
The installation process is tested in macOS Mojave, we have a separate docker binding for compiling the libraries for Linux and soon this library will be integrated in that as well
You may need to install libgit2. In case you are in mac just use brew install libgit2
Setup
Building the .so files
Please note that building the libraries has been tested under a macOS Mojave with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
Please check out our Linux specific instructions here
Once this library is installed it gives you a command line utility to download and compile tree-sitter .so files with ease. As an example -
create_libs python
Here is the full usage guide of the command
usage: create_libs [-h] [-c] [-l LIB_NAME] langs [langs ...]
positional arguments:
langs Give the name of languages for tree-sitter (php,
python, go ...)
optional arguments:
-h, --help show this help message and exit
-c, --copy-to-workspace
Shall we copy the created libs to the present dir?
(default: False)
-l LIB_NAME, --lib-name LIB_NAME
The name of the generated .so file
Environment variables
You can set up TS_LIB_PATH
environment variable for the tree-sitter lib path and then the libary will use them automatically. Otherwise, as an alternative, you can pass it when creating any Parser
object.
Hello world example
-
Generate the librairies : run the above command to generate the libraries.
In our settings we use the
-c
flag to copy the generatedtree-sitter
library's.so
file to our workspace. Once copied, we place it under a directory calledtslibs
(It is in the .gitignore).⚠ If you are using linux,you will need to use our tree-sitter-docker image and manually copy the final .so file.
-
Setup environment variable (optional) Assuming that you have the necessary environment variable setup. The following line of code will create a
Parser
object according to the language you want to analyse:
Python
# Python
from tree_hugger.core import PythonParser
pp = PythonParser()
pp.parse_file("tests/assets/file_with_different_functions.py")
pp.get_all_function_names()
Out[4]:
['first_child', 'second_child', 'say_whee', 'wrapper', 'my_decorator', 'parent']
PHP
# PHP
from tree_hugger.core import PHPParser
phpp = PHPParser()
phpp.parse_file("tests/assets/file_with_different_functions.php")
phpp.get_all_function_names()
Out[5] :
['foo', 'test', 'simple_params', 'variadic_param' ]
Java
# Java
from tree_hugger.core import JavaParser
jp = JavaParser()
jp.parse_file("tests/assets/file_with_different_methods.java")
jp.get_all_class_names()
Out[6] :
['HelloWorld','Animal', 'Dog' ]
JavaScript
# JavaScript
from tree_hugger.core import JavascriptParser
jsp = JavascriptParser()
jsp.parse_file("tests/assets/file_with_different_functions.js")
jsp.get_all_function_names()
Out[7] :
['test', 'utf8_to_b64', 'sum', 'multiply' ]
C++
from tree_hugger.core import CPPParser
cp = CPPParser()
cp.parse_file("tests/assets/file_with_different_functions.cpp")
cp.get_all_function_names()
Out[8] :
['foo', 'test', 'simple_params', 'variadic_param' ]
API reference
Language | Functions | Methods | Classes |
---|---|---|---|
Python | all_function_names all_function_doctrings all_function_names_and_params all_function_bodies | all_class_methods all_class_method_docstrings | all_class_names all_class_docstrings |
PHP | all_function_names all_function_names_and_params all_function_bodies | all_class_methods | all_class_names |
Java | all_class_methods all_method_names_and_params all_method_bodies | all_class_names | |
JavaScript | all_function_names all_function_names_and_params all_function_bodies | all_class_methods | all_class_names |
C++ | all_function_names all_function_names_and_params all_function_bodies | all_class_methods | all_class_names |
Extending tree-hugger
Extending tree-hugger for other languages and/or more functionalities for the already provided ones, is easy.
-
Adding languages:
Parsed languages can be extended through adding a parser class from the BaseParser class. The only mandatory argument that a Parser class should pass to the parent is the language
. This is a string. Such as python
(lower case). Each parser class must have the options to take in the path of the tree-sitter library (.so file that we are using to parse the code) and the path to the queries yaml file, in their constructor.
The BaseParser class can do few things:
- Loading and preparing the .so file with respect to the language you just mentioned.
- Loading, preparing and parsing the query yaml file. (for the queries, we internally use an extended UserDict class)
- Providing an API to parse a file and prepare it for query.
BaseParser.parse_file
It also gives you another (most likely not to be exposed outside) API _run_query_and_get_captures
which lets you run any queries and return back the matched results (if any) from the parsed tree.
We use those APIs once we have called parse_file
and parsed the file.
-
Adding queries:
Queries processed on source code are s-expressions, they are listed in a queries.yml
file for each parser class. Tree-hugger gives you a way to write your queries in yaml file for each language parsed.
Query structure: A name of a query followed by the query itself. Written as an s-expression. Example:
all_function_docstrings:
"
(
function_definition
name: (identifier) @function.def
body: (block(expression_statement(string))) @function.docstring
)
"
You have to follow yaml grammar while writing these queries. You can see a bit more about writng these queries in the documentation of tree-sitter.
Some example queries, that you will find in the yaml file (and their corresponding API from the PythonParser class) -
* all_function_names => get_all_function_names()
* all_function_docstrings => get_all_function_documentations()
* all_class_methods => get_all_class_method_names()
Roadmap
-
Documentation: tutorial on queries writing
-
Write *Parser class for other languages
Languages | Status-Finished | Author |
---|---|---|
Python | ✅ | Shubhadeep |
PHP | ✅ | Clément |
Java | ✅ | Clément |
JavaScript | ✅ | Clément |
C++ | ✅ | Clément |
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