RedBaron is a python library and tool powerful enough to be used into IPython solely that intent to make the process of writting code that modify source code as easy and as simple as possible. That include writing custom refactoring, generic refactoring, tools, IDE or directly modifying you source code into IPython with an higher and more powerful abstraction than the advanced texts modification tools that you find in advanced text editors and IDE.
RedBaron guaranteed you that it will only modify your code where you ask him to. To achieve this, it is based on Baron a lossless AST for Python that guarantees the operation :file:`fst_to_code(code_to_fst(source_code)) == source_code`.
RedBaron API and feel is heavily inspired by BeautifulSoup. It tries to be simple and intuitive and that once you've get the basics principles, you are good without reading the doc for 80% of your operations.
This documentation is full of example for nearly everything. But in fact, those aren't really "example": those are real life code that are executed at the compilation time of this documentation, this guaranteed the example you see to work exactly the same way for you.
Funny side effect: this make it possible to "break" this documentation.
https://github.com/Psycojoker/redbaron
pip install redbaron
.. ipython:: python
:suppress:
import sys
sys.path.append("..")
import redbaron
redbaron.ipython_behavior = False
Simple API: give string, get string back.
.. ipython:: python
from redbaron import RedBaron
red = RedBaron("some_value = 42")
red.dumps() # get code back
Though to be used in IPython directly:
.. ipython:: python
red # direct feedback like BeautifulSoup, "0" here is the index of the node in our source code
red.help() # helper function that discribe nodes content so you don't have to read the doc
Easy nodes modifications, you already know how to code in python, so pass python code (in a string) on the attribute you want to modify (wonder what :file:`.value` is? look at the output of :file:`.help()` in the previous example):
.. ipython:: python
red[0].value = "1 + 4"
red
Easy queries, just like in BeautifulSoup:
.. ipython:: python
red.find("int", value=4)
red.find_all("int") # can also be written red("int") like in BeautifulSoup
Queries can be very powerful, you can test each attributes with value/lambda/regex/special syntax for regex/globs.
Now let's pretend that we are editing a django settings.py (notice that we are extending our source code using the same API than the one of a python list since we are in a list of lines):
.. ipython:: python
red.extend(["\n", "INSTALLED_APPLICATIONS = (\n 'django',\n)"]) # here "\n" is to had a blank line
red
And let's install another django application! (again: same API than a python list)
.. ipython:: python
red.find("assignment", target=lambda x: x.dumps() == "INSTALLED_APPLICATIONS").value.append("'another_app'")
red
Notice that the formatting of the tuple has been detected and respected when adding the new django application.
And let's see the result of our work:
.. ipython:: python
print(red.dumps())
.. toctree:: :maxdepth: 2 tuto why basics querying modifying proxy_list other
.. toctree:: :maxdepth: 2 nodes_reference