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6.1 Conversion of Elisp objects to Prolog terms ¶

Sweep converts Elisp objects into Prolog terms to allow the Elisp programmers to specify arguments for Prolog predicates invocations (see Definition of sweeprolog-open-query). Seeing as some Elisp objects, like Elisp compiled functions, wouldn’t be as useful for passing to Prolog as others, Sweep only converts Elisp objects of certain types to Prolog, namely Sweep currently converts trees of strings and numbers:

• Elisp strings are converted to equivalent Prolog strings.
• Elisp integers are converted to equivalent Prolog integers.
• Elisp floats are converted to equivalent Prolog floats.
• The Elisp nil object is converted to the Prolog empty list [].
• Elisp cons cells are converted to Prolog lists whose head and tail are the Prolog representations of the car and the cdr of the cons.