57 lines
2.2 KiB
Racket
57 lines
2.2 KiB
Racket
#reader(lib "docreader.ss" "scribble")
|
|
@require[(lib "manual.ss" "scribble")]
|
|
@require["utils.ss"]
|
|
|
|
@title[#:tag "eval"]{Evaluation and Examples}
|
|
|
|
The @file{eval.ss} library provides utilities for evaluating code at
|
|
document-build time and incorporating the results in the document,
|
|
especially to show example uses of defined procedures and syntax.
|
|
|
|
@defform[(interaction datum ...)]{Like @scheme[schemeinput], except
|
|
that the result for each input @scheme[datum] is shown on the next
|
|
line. The result is determined by evaluating the quoted form of the
|
|
datum.
|
|
|
|
Uses of @scheme[code:comment] and @schemeidfont{code:blank} are
|
|
stipped from each @scheme[datum] before evaluation.
|
|
|
|
If a datum has the form @scheme[(#,(scheme code:line) #,(svar datum)
|
|
(#,(scheme code:comment) ...))], then only the @svar[datum] is
|
|
evaluated.
|
|
|
|
If a datum has the form @scheme[(eval:alts #,(svar show-datum) #,(svar
|
|
eval-datum))], then @svar[show-datum] is typeset, while
|
|
@svar[eval-datum] is evaluated.}
|
|
|
|
@defform[(interaction-eval datum)]{Evaluates the quoted form of
|
|
each @scheme[datum] via @scheme[do-eval] and returns the empty string.}
|
|
|
|
@defform[(interaction-eval-show datum)]{Evaluates the quoted form of
|
|
@scheme[datum] and produces an element represeting the printed form of
|
|
the result.}
|
|
|
|
@defform[(schemeblock+eval datum ...)]{Combines @scheme[schemeblock]
|
|
and @scheme[interaction-eval].}
|
|
|
|
@defform[(schememod+eval name datum ...)]{Combines @scheme[schememod]
|
|
and @scheme[interaction-eval].}
|
|
|
|
@defform[(def+int defn-datum expr-datum ...)]{Like
|
|
@scheme[interaction], except the the @scheme[defn-datum] is typeset as
|
|
for @scheme[schemeblock] (i.e., no prompt) with a line of space
|
|
between the definition and the interactions.}
|
|
|
|
@defform[(defs+int (defn-datum ...) expr-datum ...)]{Like
|
|
@scheme[def+int], but for multiple leading definitions.}
|
|
|
|
@defform[(examples datum ...)]{Like @scheme[interaction], but with an
|
|
``Examples:'' label prefixed.}
|
|
|
|
@defform[(defexamples datum ...)]{Like @scheme[examples], but each
|
|
definition using @scheme[define] among the @scheme[datum]s is typeset
|
|
without a prompt, and with space after it.}
|
|
|
|
@defthing[current-int-namespace parameter?]{A parameter to hold the
|
|
namespace used by @scheme[interaction], etc.}
|