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--1 Predefined functions for concrete syntax
-- The definitions of these constants are hard-coded in GF, and defined
-- in [AppPredefined.hs ../src/GF/Grammar/AppPredefined.hs]. Applying
-- them to run-time variables leads to compiler errors that are often
-- only detected at the code generation time.
resource Predef = {
-- This type of booleans is for internal use only.
param PBool = PTrue | PFalse ;
oper Error : Type = variants {} ; -- the empty type
oper Int : Type = variants {} ; -- the type of integers
oper Ints : Int -> Type = variants {} ; -- the type of integers from 0 to n
oper error : Str -> Error = variants {} ; -- forms error message
oper length : Tok -> Int = variants {} ; -- length of string
oper drop : Int -> Tok -> Tok = variants {} ; -- drop prefix of length
oper take : Int -> Tok -> Tok = variants {} ; -- take prefix of length
oper tk : Int -> Tok -> Tok = variants {} ; -- drop suffix of length
oper dp : Int -> Tok -> Tok = variants {} ; -- take suffix of length
oper eqInt : Int -> Int -> PBool = variants {} ; -- test if equal integers
oper lessInt: Int -> Int -> PBool = variants {} ; -- test order of integers
oper plus : Int -> Int -> Int = variants {} ; -- add integers
oper eqStr : Tok -> Tok -> PBool = variants {} ; -- test if equal strings
oper occur : Tok -> Tok -> PBool = variants {} ; -- test if occurs as substring
oper occurs : Tok -> Tok -> PBool = variants {} ; -- test if any char occurs
oper show : (P : Type) -> P -> Tok = variants {} ; -- convert param to string
oper read : (P : Type) -> Tok -> P = variants {} ; -- convert string to param
oper toStr : (L : Type) -> L -> Str = variants {} ; -- find the "first" string
oper mapStr : (L : Type) -> (Str -> Str) -> L -> L = variants {} ;
-- map all strings in a data structure; experimental ---
} ;
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