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* Replaced the SDF parser by a substantially faster Bison/Flex

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parser (roughly 80x faster).

  The absolutely latest version of Bison (1.875c) is required for
  reentrant GLR support, as well as a recent version of Flex (say,
  2.5.31).  Note that most Unix distributions ship with the
  prehistoric Flex 2.5.4, which doesn't support reentrancy.
This commit is contained in:
Eelco Dolstra 2004-01-30 15:21:42 +00:00
parent abd1878b26
commit c5baaafae6
6 changed files with 261 additions and 252 deletions
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131
src/libexpr/nix.sdf
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@ -1,131 +0,0 @@
definition
module Main
imports Fix
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Top level syntax.
module Fix
imports Fix-Exprs Fix-Layout
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Expressions.
module Fix-Exprs
imports Fix-Lexicals
exports
sorts Expr Formal Bind Binds ExprList
context-free syntax
Id -> Expr {cons("Var")}
Int -> Expr {cons("Int")}
Str -> Expr {cons("Str")}
Uri -> Expr {cons("Uri")}
Path -> Expr {cons("Path")}
"(" Expr ")" -> Expr {bracket}
Expr Expr -> Expr {cons("Call"), left}
"{" {Formal ","}* "}" ":" Expr -> Expr {cons("Function")}
Id -> Formal {cons("NoDefFormal")}
Id "?" Expr -> Formal {cons("DefFormal")}
"assert" Expr ";" Expr -> Expr {cons("Assert")}
"rec" "{" Binds "}" -> Expr {cons("Rec")}
"let" "{" Binds "}" -> Expr {cons("LetRec")}
"{" Binds "}" -> Expr {cons("Attrs")}
Bind* -> Binds
Id "=" Expr ";" -> Bind {cons("Bind")}
"[" ExprList "]" -> Expr {cons("List")}
"" -> ExprList {cons("ExprNil")}
Expr ExprList -> ExprList {cons("ExprCons")}
Expr "." Id -> Expr {cons("Select")}
"if" Expr "then" Expr "else" Expr -> Expr {cons("If")}
Expr "==" Expr -> Expr {cons("OpEq"), non-assoc}
Expr "!=" Expr -> Expr {cons("OpNEq"), non-assoc}
"!" Expr -> Expr {cons("OpNot")}
Expr "&&" Expr -> Expr {cons("OpAnd"), right}
Expr "||" Expr -> Expr {cons("OpOr"), right}
Expr "->" Expr -> Expr {cons("OpImpl"), right}
context-free priorities
Expr "." Id -> Expr
> Expr ExprList -> ExprList
> Expr Expr -> Expr
> "!" Expr -> Expr
> Expr "==" Expr -> Expr
> Expr "!=" Expr -> Expr
> Expr "&&" Expr -> Expr
> Expr "||" Expr -> Expr
> Expr "->" Expr -> Expr
> "assert" Expr ";" Expr -> Expr
> "{" {Formal ","}* "}" ":" Expr -> Expr
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Lexical syntax.
module Fix-Lexicals
exports
sorts Id Int Str Path PathComp Uri
lexical syntax
[a-zA-Z\_][a-zA-Z0-9\_\']* -> Id
"rec" -> Id {reject}
"let" -> Id {reject}
"if" -> Id {reject}
"then" -> Id {reject}
"else" -> Id {reject}
"assert" -> Id {reject}
[0-9]+ -> Int
"\"" ~[\n\"]* "\"" -> Str
"." ("/" PathComp)+ -> Path
".." ("/" PathComp)+ -> Path
("/" PathComp)+ -> Path
[a-zA-Z0-9\.\_\-\+]+ -> PathComp
[a-zA-Z] [a-zA-Z0-9\+\-\.]* ":" [a-zA-Z0-9\%\/\?\:\@\&\=\+\$\,\-\_\.\!\~\*\']* -> Uri
lexical restrictions
Id -/- [a-zA-Z0-9\_\']
Int -/- [0-9]
Path -/- [a-zA-Z0-9\.\_\-\+\/]
Uri -/- [a-zA-Z0-9\%\/\?\:\@\&\=\+\$\,\-\_\.\!\~\*\']
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Layout.
module Fix-Layout
exports
sorts HashComment Asterisk Comment
lexical syntax
[\ \t\n] -> LAYOUT
HashComment -> LAYOUT
Comment -> LAYOUT
"#" ~[\n]* -> HashComment
"/*" ( ~[\*] | Asterisk )* "*/" -> Comment
[\*] -> Asterisk
lexical restrictions
Asterisk -/- [\/]
HashComment -/- ~[\n]
context-free restrictions
LAYOUT? -/- [\ \t\n]