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--1 The GF Prelude
-- This file defines some prelude facilities usable in all grammars.
resource Prelude = open (Predef=Predef) in {
oper
--2 Strings, records, and tables
SS : Type = {s : Str} ;
ss : Str -> SS = \s -> {s = s} ;
ss2 : (_,_ : Str) -> SS = \x,y -> ss (x ++ y) ;
ss3 : (_,_ ,_: Str) -> SS = \x,y,z -> ss (x ++ y ++ z) ;
cc2 : (_,_ : SS) -> SS = \x,y -> ss (x.s ++ y.s) ;
cc3 : (_,_,_ : SS) -> SS = \x,y,z -> ss (x.s ++ y.s ++ z.s) ;
SS1 : Type -> Type = \P -> {s : P => Str} ;
ss1 : (A : Type) -> Str -> SS1 A = \A,s -> {s = table {_ => s}} ;
SP1 : Type -> Type = \P -> {s : Str ; p : P} ;
sp1 : (A : Type) -> Str -> A -> SP1 A = \_,s,a -> {s = s ; p = a} ;
constTable : (A,B : Type) -> B -> A => B = \_,_,b -> \\_ => b ;
constStr : (A : Type) -> Str -> A => Str = \A -> constTable A Str ;
-- Discontinuous constituents.
SD2 : Type = {s1,s2 : Str} ;
sd2 : (_,_ : Str) -> SD2 = \x,y -> {s1 = x ; s2 = y} ;
--2 Optional elements
-- Missing form.
nonExist : Str = variants {} ;
-- Optional string with preference on the string vs. empty.
optStr : Str -> Str = \s -> variants {s ; []} ;
strOpt : Str -> Str = \s -> variants {[] ; s} ;
-- Free order between two strings.
bothWays : Str -> Str -> Str = \x,y -> variants {x ++ y ; y ++ x} ;
-- Parametric order between two strings.
preOrPost : Bool -> Str -> Str -> Str = \pr,x,y ->
if_then_Str pr (x ++ y) (y ++ x) ;
--2 Infixes. prefixes, and postfixes
-- Fixes with precedences are defined in [Precedence Precedence.html].
infixSS : Str -> SS -> SS -> SS = \f,x,y -> ss (x.s ++ f ++ y.s) ;
prefixSS : Str -> SS -> SS = \f,x -> ss (f ++ x.s) ;
postfixSS : Str -> SS -> SS = \f,x -> ss (x.s ++ f) ;
embedSS : Str -> Str -> SS -> SS = \f,g,x -> ss (f ++ x.s ++ g) ;
--2 Booleans
param Bool = True | False ;
oper
if_then_else : (A : Type) -> Bool -> A -> A -> A = \_,c,d,e ->
case c of {
True => d ; ---- should not need to qualify
False => e
} ;
andB : (_,_ : Bool) -> Bool = \a,b -> if_then_else Bool a b False ;
orB : (_,_ : Bool) -> Bool = \a,b -> if_then_else Bool a True b ;
notB : Bool -> Bool = \a -> if_then_else Bool a False True ;
if_then_Str : Bool -> Str -> Str -> Str = if_then_else Str ;
onlyIf : Bool -> Str -> Str = \b,s -> case b of {
True => s ;
_ => nonExist
} ;
-- Interface to internal booleans
pbool2bool : Predef.PBool -> Bool = \b -> case b of {
Predef.PFalse => False ; Predef.PTrue => True
} ;
init : Tok -> Tok = Predef.tk 1 ;
last : Tok -> Tok = Predef.dp 1 ;
--2 High-level acces to Predef operations
isNil : Tok -> Bool = \b -> pbool2bool (Predef.eqStr [] b) ;
ifTok : (A : Type) -> Tok -> Tok -> A -> A -> A = \A,t,u,a,b ->
case Predef.eqStr t u of {Predef.PTrue => a ; Predef.PFalse => b} ;
--2 Lexer-related operations
-- Bind together two tokens in some lexers, either obligatorily or optionally
oper
glue : Str -> Str -> Str = \x,y -> x ++ BIND ++ y ;
glueOpt : Str -> Str -> Str = \x,y -> variants {glue x y ; x ++ y} ;
noglueOpt : Str -> Str -> Str = \x,y -> variants {x ++ y ; glue x y} ;
-- Force capitalization of next word in some unlexers
capitalize : Str -> Str = \s -> CAPIT ++ s ;
-- These should be hidden, and never changed since they are hardcoded in (un)lexers
BIND : Str = "&+" ;
PARA : Str = "&-" ;
CAPIT : Str = "&|" ;
--2 Miscellaneous
-- Identity function
id : (A : Type) -> A -> A = \_,a -> a ;
-- Parentheses
paren : Str -> Str = \s -> "(" ++ s ++ ")" ;
parenss : SS -> SS = \s -> ss (paren s.s) ;
-- Zero, one, two, or more (elements in a list etc)
param
ENumber = E0 | E1 | E2 | Emore ;
oper
eNext : ENumber -> ENumber = \e -> case e of {
E0 => E1 ; E1 => E2 ; _ => Emore} ;
}
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