This is style50, with which code can be checked against the CS50 style guide
Project description
style50
This is style50, a tool with which code can be checked against the CS50 style guide.
Installation
pip install style50
In order to style check C, C++, or Java code, a recent version (>=14.0.0
) of clang-format
must be installed. clang-format
may be downloaded here.
Windows
Along with most of CS50's command line tools, style50
supports being run on Windows but only via the Linux Subsystem in Windows 10. After launching it, style50
can be installed using the pip
command above.
Usage
usage: style50 [-h] [-o MODE] [-v] [-V] [-E] [-i PATTERN] file [file ...]
positional arguments:
file file or directory to lint
optional arguments:
-h, --help show this help message and exit
-o MODE, --output MODE
output mode, which can be character (default), split,
unified, score, or json
-v, --verbose print full tracebacks of errors
-V, --version show program's version number and exit
-E, --extensions print supported file extensions (as JSON list) and
exit
-i PATTERN, --ignore PATTERN
paths/patterns to be ignored
character
, split
, and unified
modes output character-based, side-by-side, and unified (respectively) diffs between the inputted file and the correctly styled version. score
outputs the raw percentage of correct (unchanged) lines, while json
outputs a json object containing information pertinent to the CS50 IDE plugin (coming soon).
Language Support
style50
currently supports the following languages:
- C++
- C
- Python
- Javascript
- Java
Adding a new language
Adding a new language is very simple. Language checks are encoded as classes which inherit from the StyleCheck
base class (see style50/languages.py
for more real-world examples). The following is a template for style checks which allows style50 to check the imaginary FooBar language for style.
import re
from style50 import StyleCheck, Style50
class FooBar(StyleCheck):
# REQUIRED: this property informs style50 what file extensions this
# check should be run on (in this case, all .fb and .foobar files)
extensions = ["fb", "foobar"]
# REQUIRED: should return a correctly styled version of `code`
def style(self, code):
# All FooBar code is perfectly styled
return code
# OPTIONAL: should return the number of comments in `code`.
# If this function is not defined, `style50` will not warn the student about
# too few comments
def count_comments(self, code):
# A real-world, check would need to worry about not counting '#' in string-literals
return len(re.findall(r"#.*", code))
All classes which inherit from StyleCheck
are automatically registered with style50
's Style50
class, making style50 easily extensible. Adding the following to the above code creates a script which checks the code that style50
already does as well as FooBar programs.
# Style check the current directory, printing a unified diff
Style50("unified").run(["."])
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