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paser-tools: doc clarifications

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Nothing in the docs said that `parser-tools/yacc' is for LALR grammars
--- although I guess that it implied for most reader by the name "yacc",
but it doesn't hurt to say so explicitly. Meanwhile,
`parser-tools/cfg-parser' is useful for non-ambigious (non-LALR) grammars.

Also, from the style guide:
 * Section Titles Should be In Titlecase, Like This
 * Don't start a setence with an uncapitalized identifier.
This commit is contained in:
Matthew Flatt 2013-01-23 11:40:36 -05:00
parent 780fc2100a
commit 9e0fce224b
1 changed files with 11 additions and 12 deletions
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23
collects/parser-tools/parser-tools.scrbl
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@ -486,7 +486,7 @@ the right choice when using @racket[lexer] in other situations.
@; ---------------------------------------------------------------------- @; ----------------------------------------------------------------------
@section{Parsers} @section{LALR(1) Parsers}
@section-index["yacc"] @section-index["yacc"]
@ -685,14 +685,13 @@ the right choice when using @racket[lexer] in other situations.
@section{Ambiguous parsing} @section{Context-Free Parsers}
@section-index["cfg-parser"] @section-index["cfg-parser"]
@defmodule[parser-tools/cfg-parser] @defmodule[parser-tools/cfg-parser]{The @racketmodname[parser-tools/cfg-parser]
library provides a parser generator that is an alternative to that of
@racketmodname[parser-tools/cfg-parser] provides another parser @racketmodname[parser-tools/yacc].}
generator as an alternative to @racketmodname[parser-tools/yacc].
@defform/subs[#:literals (grammar tokens start end precs src-pos @defform/subs[#:literals (grammar tokens start end precs src-pos
suppress debug yacc-output prec) suppress debug yacc-output prec)
@ -706,10 +705,11 @@ generator as an alternative to @racketmodname[parser-tools/yacc].
(end token-id ...) (end token-id ...)
(@#,racketidfont{error} expr) (@#,racketidfont{error} expr)
(src-pos)])]{ (src-pos)])]{
Creates a parser similar to that of @racket[parser]. Unlike @racket[parser], Creates a parser similar to that of @racket[parser]. Unlike @racket[parser],
@racket[cfg-parser] can consume ambiguous grammars. @racket[cfg-parser], can consume arbitrary and potentially ambiguous context-free
Its interface is a subset of @racketmodname[parser-tools/yacc]. grammars. Its interface is a subset of @racketmodname[parser-tools/yacc], with
The major differences in the interface are: the following differences:
@itemize[ @itemize[
@ -718,12 +718,11 @@ generator as an alternative to @racketmodname[parser-tools/yacc].
Unlike @racket[parser], @racket[cfg-parser] only allows for Unlike @racket[parser], @racket[cfg-parser] only allows for
a single non-terminal-id.} a single non-terminal-id.}
@item{@racket[cfg-parser] does not support the @racket[precs], @item{The @racket[cfg-parser] form does not support the @racket[precs],
@racket[suppress], @racket[debug], or @racket[yacc-output] @racket[suppress], @racket[debug], or @racket[yacc-output]
options of @racket[parser].} options of @racket[parser].}
] ]
} }
@; ---------------------------------------------------------------------- @; ----------------------------------------------------------------------