Assignment 5

All programs require the argparse package. External regex package regex is needed to run highlighter.py.

pip3 install argparse regex

I have made tests for diff.py and syntax_tagger.py.

python3 -m pytest

(Make sure to run the test in the folder containing diff.py and syntax_tagger.py)

Syntax highlighter

highlighter.py is a program that will print highlighted text to the terminal, according to syntax and theme rules you supply.

To run the program:

python3 highlighter.py [ syntax rules path ] [ theme path ] [ file to highlight ]

Syntax and theme files format

The syntax file is expected to be in this format: "[ regex pattern ]": [ tagname ]. One line per tag.

Example:

"\b(if|elif|else)\b": conditionals

The theme file is expected to be in this format: [ tagname ]: [ ANSI-color ], where ANSI code is one or two digits, followed by a semicolon followed by another one or two digits. Also one line per tag.

Example:

conditionals: 0;34

I have supplied demo-files for Python and Elm (code examples are in the demo_files folder).

Grep

grep.py finds lines in a file that match a given regex pattern. Gives a colorful output with --highlight. Patterns must be delimited with double or single quotes, '/". If your regex includes quotes they must be escaped with backslash, like this:\".

python3 grep.py [ --highlight ] [ pattern [ pattern ... ] ] [ file path ]

Diff

diff.py finds the changed lines from two files and marks the differing lines.

python3 diff.py [ old file path ] [ new file path ]