Implementing Stack Operations in Prolog Using Definite Clause Grammars (DCGs)
By
triska
A respectable bake. You'd come back tomorrow for another.
Summary
The article demonstrates how to implement stack-based operations in Prolog using Definite Clause Grammars (DCGs). It shows how to create stack manipulation operations like pop, push, dup, swap, nip, over, and arithmetic operations (add, sub, mul, div, power, negate) using DCG syntax. The author draws parallels between these Prolog DCG implementations and Forth's stack notation, showing how Prolog can be used to create a stack-based programming language within its logical programming paradigm.
Key quotes
· 5 pulledpop --> [_].
dup, [A,A] --> [A].
swp, [B,A] --> [A,B].
add, [C] --> [A,B], {C is A+B}.
These are basically equivalent to Forth's stack signature but instead of dup ( a -- a a ) we're saying dup, [A,A] --> [A].
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