RLG to NFSM/RRG Converter

RLG to NFSM/RRG Converter is an application written in Haskell that allows you to convert RLGs (right linear grammars) into NFSMs (non-deterministic finite state machines) or RRGs (right regular grammars). RLGs cannot contain simple rules (e.g. A -> B).

Installation

To compile the app it is necessary to have the GHC compiler installed. To create the flp21-fun binary run:

git clone https://github.com/TomasBeranek/but-flp-project-1.git
cd but-flp-project-1/
make

Usage

The app can be run:

flp21-fun OPTION [INPUT_FILE]

where

• OPTION is one of:
  • -i prints the loaded RLG to stdout. The printed RLG is in the standard format, i.e. without duplicates, alphabetically sorted, etc.
  • -1 prints the converted RRG to stdout in the same standard format as the input RLG. The exception is newly created non-terminals, which can be named A1, B1, etc.
  • -2 prints the converted NFSM to stdout.
• INPUT_FILE is an optional parameter containing the name of the input file. If the file is not specified, the program reads the input from stdin.

For examples of RLG input formats and RRG/NFSM output formats, see the tests/ directory.

Tests

To run the tests, run:

make test

Each test is run in both stdin and INPUT_FILE mode.

Test descriptions

• test01 - RRG from the assignment. Output NFSM.
• test02 - RRG with duplicities. Output RLG.
• test03 - RLG with single simple full-terminal rule. Output RLG.
• test04 - RRG with duplicities and wrong alphabetical order. Output RRG.
• test05 - RLG with single simple full-terminal rule. Output RRG.
• test06 - RLG with more complex full-terminal and non-terminal rules. Output RRG.
• test07 - exceeding simple non-terminal names by splitting rules. Output RRG.
• test08 - same as test05. Output NFSM.
• test09 - same as test06. Output NFSM.
• test10 - same as test07. Output NFSM.
• test11 - random RLG. Output NFSM.
• test12 - random RLG. Output NFSM.
• test13 - random RLG. Output NFSM.
• test14 - incorrect program option. Output ERROR.
• test15 - more than one correct argument. Output ERROR.
• test16 - zero arguments. Output ERROR.
• test17 - more than one file. Output ERROR.
• test18 - empty input. Output ERROR.
• test19 - empty non-terminal set. Output ERROR.
• test20 - incorrect format of non-terminal set. Output ERROR.
• test21 - empty terminal set. Output ERROR.
• test22 - incorrect format of terminal set. Output ERROR.
• test23 - no starting symbol. Output ERROR.
• test24 - incorrect format of starting symbol. Output ERROR.
• test25 - empty rule set. Output ERROR.
• test26 - incorrect format of rule set. Output ERROR.
• test27 - rules contain non-existing non-terminal. Output ERROR.
• test28 - rules contain non-existing terminal. Output ERROR.
• test29 - terminal set is empty and rule set contains only #-rules. Output NFSM.
• test30 - starting symbol is non-existing non-terminal. Output ERROR.

Features implemented beyond requirements

• checking of the format of program input arguments. See test14-17.
• checking of the format of input RLG. See test18-30.
• set of tests.
• script tests/tester.py for automated testing.