60 lines
1.8 KiB
Racket
60 lines
1.8 KiB
Racket
#lang scribble/doc
|
|
@(require scribble/manual
|
|
"utils.ss"
|
|
(for-label scribble/bnf))
|
|
|
|
@title[#:tag "bnf"]{BNF Grammars}
|
|
|
|
@defmodule[scribble/bnf]{The @scheme[scribble/bnf] library
|
|
provides utilities for typesetting grammars.}
|
|
|
|
See also @scheme[schemegrammar].
|
|
|
|
@defproc[(BNF [prod (cons element? (listof element?))] ...) table?]{
|
|
|
|
Typesets a grammar table. Each production starts with an element
|
|
(typically constructed with @scheme[nonterm]) for the non-terminal
|
|
being defined, and then a list of possibilities (typically constructed
|
|
with @scheme[BNF-seq], etc.) to show on separate lines.}
|
|
|
|
@defproc[(nonterm (pre-content any/c) ...) element?]{
|
|
|
|
Typesets a non-terminal: italic in angle brackets.}
|
|
|
|
@defproc[(BNF-seq [elem element?] ...) element?]{
|
|
|
|
Typesets a sequence.}
|
|
|
|
@defproc[(BNF-group [pre-content any/c] ...) element?]{
|
|
|
|
Typesets a group surrounded by curly braces (so the entire group can
|
|
be repeated, for example).}
|
|
|
|
@defproc[(optional [pre-content any/c] ...) element?]{
|
|
|
|
Typesets an optional element: in square brackets.}
|
|
|
|
@defproc[(kleenestar [pre-content any/c] ...) element?]{
|
|
|
|
Typesets a 0-or-more repetition.}
|
|
|
|
@defproc[(kleeneplus [pre-content any/c] ...) element?]{
|
|
|
|
Typesets a 1-or-more repetition.}
|
|
|
|
@defproc[(kleenerange [n any/c] [m any/c] [pre-content any/c] ...) element?]{
|
|
|
|
Typesets a @scheme[n]-to-@scheme[m] repetition. The @scheme[n] and
|
|
@scheme[m] arguments are converted to a string using @scheme[(format
|
|
"~a" n)] and @scheme[(format "~a" m)].}
|
|
|
|
@defproc[(BNF-alt [elem element?] ...) element?]{
|
|
|
|
Typesets alternatives for a production's right-hand side to appear on
|
|
a single line. The result is normally used as a single possibility in
|
|
a production list for @scheme[BNF].}
|
|
|
|
@defthing[BNF-etc string?]{
|
|
|
|
A string to use for omitted productions or content.}
|