The ParserFunction package

[Tags: bsd3, deprecated, library]

Deprecated in favor of attoparsec

ParserFunction provides utilities for parsing and evaluating mathematical expressions. The central parsing function in this package is stringToExpr, which parses a string-expression (e.g. "3*x+2") and returns a Maybe expression tree of type Expr (e.g. Just (Add (Mul (Num 3.0) (Var 'x')) (Num 2.0))). This type is suitable for performing symbolic logic. Expressions can then be evaluated using the function evaluate (e.g. evaluate (fromAscList [("x",2)]) (Add (Mul (Num 3.0) (Var 'x'))) (Num 2.0) would give 8.0). If you wish to evaluate a string-expression without any intermediate symbolic logic operations, simply use the function evaluateExpression (e.g. evaluateExpression "3*x+2" [('x',4)] gives 14.0). More examples of these functions can be found by viewing the source code for this package.


Versions0.0.1, 0.0.2, 0.0.3, 0.0.4, 0.0.5, 0.0.6, 0.0.7, 0.0.8, 0.1.0
Change logNone available
Dependenciesbase (<6), containers, parsec [details]
AuthorEnzo Haussecker
UploadedTue Feb 7 22:33:12 UTC 2012 by EnzoHaussecker
Downloads1919 total (60 in last 30 days)
0 []
StatusDocs uploaded by user
Build status unknown [no reports yet]




Maintainers' corner

For package maintainers and hackage trustees