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- current-prompt-read: parameter for a procedure that takes
no arguments, displays a prompt string, and returns an expression to
evaluate. This prompt read handler is called by the read
phase of read-eval-print-loop (see section 14.1). The
default prompt read handler prints ``> '' and returns the result of
(read).
- current-eval: parameter for a procedure that takes an S-expression
and returns its value (or values; see Chapter 2). This
evaluation handler is called by
eval, the default load handler, and read-eval-print-loop
to evaluate an expression (see section 14.1). The default
evaluation handler compiles and executes the expression in the current
namespace (determined by the current-namespace parameter).
- current-namespace: parameter for a namespace value (see
section 9.3) that determines the global variable
namespace used to resolve variable references. The current namespace
is used by the default evaluation handler, the compile
procedure, and other built-in procedures that operate on global
variables.
- current-print: parameter for a procedure that takes a value
to print. This print handler is called by
read-eval-print-loop (see section 14.1) to print the result
of an evaluation (and the result is ignored). The default print
handler prints the value to the current output port (determined
by the current-output-port parameter) and then outputs a
newline.
PLT