mathematical-expressions-haskell
A simple parser for mathematical expressions in Haskell, using Monadic Parsing.
Based on the following EBNF grammar:
expr ::= term (+ expr | - expr | epsilon)
term ::= pow (* term | / term | epsilon)
pow ::= factor (^ pow | epsilon)
factor ::= ( expr ) | integer
integer ::= digit digit*
digit ::= [0-9]
This grammar (modified) is due to Graham Hutton's book, "Programming in Haskell" (2nd Edition). Check the companion repository, mathematical-expressions-java for the comparative implementation in Java, using a Recursive-Descent parser.
Build and Run
To build the project, execute the following command:
$ stack clean && stack build
To run the project, execute:
$ stack exec mathematical-expressions-haskell-exe