EVALUATION FUNCTIONS

EVALUATE AN XLISP EXPRESSION

(eval <expr>)

<expr> the expression to be evaluated

returns the result of evaluating the expression

APPLY A FUNCTION TO A LIST OF ARGUMENTS

(apply <fun> <arg>...<args>)

<fun> the function to apply (or function symbol). May not be macro or fsubr.

<arg> initial arguments, which are CONSed to...

<args> the argument list

returns the result of applying the function to the arguments

CALL A FUNCTION WITH ARGUMENTS

(funcall <fun> <arg>...)

<fun> the function to call (or function symbol). May not be macro or fsubr.

<arg> arguments to pass to the function

returns the result of calling the function with the arguments

RETURN AN EXPRESSION UNEVALUATED

(quote <expr>)

fsubr

<expr> the expression to be quoted (quoted)

returns <expr> unevaluated

GET THE FUNCTIONAL INTERPRETATION

(function <expr>)

fsubr

<expr> the symbol or lambda expression (quoted)

returns the functional interpretation

MAKE A COMPLEMENTARY FUNCTION

(complement <fun>)

This function is intended to eliminate the need for -IF-NOT functions and :TEST-NOT keys by providing a way to make complementary functions.

<fun> the function or closure (not macro or fsubr)

returns a new function closure that returns NOT of the result of the original function.

RETURN THE EXPRESSION

(identity <expr>)

<expr> the expression

returns the expression

FILL IN A TEMPLATE

(backquote <expr>)

fsubr. Note: an improved backquote facility, which works properly when nested, is available by loading the file backquot.lsp.

<expr> the template (quoted)

returns a copy of the template with comma and comma-at expressions expanded.

COMMA EXPRESSION

(comma <expr>)

(Never executed) As the object of a backquote expansion, the expression is evaluated and becomes an object in the enclosing list.

COMMA-AT EXPRESSION

(comma-at <expr>)

(Never executed) As the object of a backquote expansion, the expression is evaluated (and must evaluate to a list) and is then spliced into the enclosing list.

MAKE A FUNCTION CLOSURE

(lambda <args> <expr>...)

fsubr

<args> formal argument list (lambda list) (quoted)

<expr> expressions of the function body (quoted)

returns the function closure

GET THE LAMBDA EXPRESSION

(get-lambda-expression <closure>)

<closure> the closure

returns the original lambda expression, or NIL if not a closure. Second return value is T if closure has a non-global environment, and the third return value is the name of the closure.

RECURSIVELY EXPAND MACRO CALLS

(macroexpand <form>)

<form> the form to expand

returns the macro expansion

EXPAND A MACRO CALL

(macroexpand-1 <form>)

<form> the macro call form

returns the macro expansion

XLISP-PLUS - Version 2.1g - Tom Almy tom.almy@tek.com - 18 JUL 94

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