129 lines
3.4 KiB
Plaintext
129 lines
3.4 KiB
Plaintext
definition
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%% Top level syntax.
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module Nix
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imports Nix-Exprs Nix-Layout
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%% Expressions.
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module Nix-Exprs
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imports Nix-Lexicals
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exports
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sorts Expr Formal Bind ExprList
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context-free start-symbols Expr
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context-free syntax
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Id | Int | Str | Uri | Path -> Expr {cons("Var")}
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"(" Expr ")" -> Expr {bracket}
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Expr Expr -> Expr {cons("Call"), left}
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Id ":" Expr -> Expr {cons("Function1")}
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"{" {Formal ","}* "}" ":" Expr -> Expr {cons("Function")}
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Id -> Formal {cons("NoDefFormal")}
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Id "?" Expr -> Formal {cons("DefFormal")}
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"assert" Expr ";" Expr -> Expr {cons("Assert")}
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"with" Expr ";" Expr -> Expr {cons("With")}
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"rec" "{" Bind* "}" -> Expr {cons("Rec")}
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"let" "{" Bind* "}" -> Expr {cons("LetRec")}
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"{" Bind* "}" -> Expr {cons("Attrs")}
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Id "=" Expr ";" -> Bind {cons("Bind")}
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"inherit" ("(" Expr ")")? Id* ";" -> Bind {cons("Inherit")}
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"[" ExprList "]" -> Expr {cons("List")}
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"" -> ExprList {cons("ExprNil")}
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Expr ExprList -> ExprList {cons("ExprCons")}
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Expr "." Id -> Expr {cons("Select")}
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"if" Expr "then" Expr "else" Expr -> Expr {cons("If")}
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Expr "==" Expr -> Expr {cons("OpEq"), non-assoc}
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Expr "!=" Expr -> Expr {cons("OpNEq"), non-assoc}
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"!" Expr -> Expr {cons("OpNot")}
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Expr "&&" Expr -> Expr {cons("OpAnd"), right}
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Expr "||" Expr -> Expr {cons("OpOr"), right}
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Expr "->" Expr -> Expr {cons("OpImpl"), right}
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Expr "//" Expr -> Expr {cons("OpUpdate"), right}
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Expr "~" Expr -> Expr {cons("SubPath"), non-assoc}
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Expr "?" Id -> Expr {cons("OpHasAttr")}
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Expr "+" Expr -> Expr {cons("OpPlus"), left}
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context-free priorities
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Expr "." Id -> Expr
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> Expr ExprList -> ExprList
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> Expr Expr -> Expr
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> Expr "~" Expr -> Expr
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> Expr "?" Id -> Expr
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> Expr "+" Expr -> Expr
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> "!" Expr -> Expr
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> Expr "//" Expr -> Expr
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> Expr "==" Expr -> Expr
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> Expr "!=" Expr -> Expr
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> Expr "&&" Expr -> Expr
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> Expr "||" Expr -> Expr
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> Expr "->" Expr -> Expr
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> "if" Expr "then" Expr "else" Expr -> Expr
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> "assert" Expr ";" Expr -> Expr
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> "with" Expr ";" Expr -> Expr
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> Id ":" Expr -> Expr
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> "{" {Formal ","}* "}" ":" Expr -> Expr
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%% Lexical syntax.
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module Nix-Lexicals
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exports
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sorts Id Int Str Path Uri
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lexical syntax
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[a-zA-Z\_][a-zA-Z0-9\_\']* -> Id
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"rec" | "let" | "if" | "then" | "else" | "assert" | "with" | "inherit" -> Id {reject}
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[0-9]+ -> Int
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"\"" ~[\n\"]* "\"" -> Str
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[a-zA-Z0-9\.\_\-\+]* ("/"[a-zA-Z0-9\.\_\-\+]+)+ -> Path
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[a-zA-Z] [a-zA-Z0-9\+\-\.]* ":" [a-zA-Z0-9\%\/\?\:\@\&\=\+\$\,\-\_\.\!\~\*\']* -> Uri
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lexical restrictions
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Id -/- [a-zA-Z0-9\_\']
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Int -/- [0-9]
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Path -/- [a-zA-Z0-9\.\_\-\+\/]
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Uri -/- [a-zA-Z0-9\%\/\?\:\@\&\=\+\$\,\-\_\.\!\~\*\']
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"rec" "let" "if" "then" "else" "assert" "with" "inherit" -/- [A-Za-z0-9\_\']
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%% Layout.
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module Nix-Layout
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exports
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sorts HashComment Asterisk Comment
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lexical syntax
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[\ \t\n] -> LAYOUT
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HashComment -> LAYOUT
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Comment -> LAYOUT
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"#" ~[\n]* -> HashComment
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"/*" ( ~[\*] | Asterisk )* "*/" -> Comment
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[\*] ~[\/] -> Asterisk
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lexical restrictions
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HashComment -/- ~[\n]
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context-free restrictions
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LAYOUT? -/- [\ \t\n]
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