Logic Expressions
Last updated at 9:53 pm UTC on 28 June 2006
This is a model of first order logic expressions, allowing you to manipulate them as objects instead of just strings.
Prerequisites:
-Refactoring Browser
-SmaCC Runtime Package
-SmaCC Development Package
Download:
-Install it from SqueakMap
Examples:
Inspect the following lines to get the expression corresponding
to "(p => q) = (not p or q)":
| p q |
p := LVariable named: 'p'.
q := LVariable named: 'q'.
p => q equiv: (p not | q).
Now, the same formula could be created using:
LExpression fromString: '{p=>q = not p or q}'
More complex formulas can also be created and evaluated, for example try:
| exp |
exp := LExpression fromString: '{V(x)[x even]}'.
exp valueDomains: {'x' -> #(2 4 6 8 10 12 )}.
See more examples in the Logic-Tests category.
I hope you enjoy it!
Dany