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aarne
2004-09-23 14:41:42 +00:00
parent d5b4230d6d
commit 2c60a2d82a
31 changed files with 434 additions and 211 deletions
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37
examples/gfcc/ResImper.gf
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@@ -1,33 +1,28 @@
resource ResImper = {
resource ResImper = open Predef in {
-- precedence
param
Prec = P0 | P1 | P2 | P3 ;
oper
PrecExp : Type = {s : Prec => Str} ;
ex : PrecExp -> Str = \exp -> exp.s ! P0 ;
constant : Str -> PrecExp = \c -> {s = \\_ => c} ;
oper
Prec : PType = Predef.Ints 4 ;
PrecExp : Type = {s : Prec => Str} ;
ex : PrecExp -> Str = \exp -> exp.s ! 0 ;
constant : Str -> PrecExp = \c -> {s = \\_ => c} ;
infixN : Prec -> Str -> PrecExp -> PrecExp -> PrecExp = \p,f,x,y ->
{s = \\k => mkPrec (x.s ! (nextPrec ! p) ++ f ++ y.s ! (nextPrec ! p)) ! p ! k} ;
{s = mkPrec (x.s ! (nextPrec ! p) ++ f ++ y.s ! (nextPrec ! p)) ! p} ;
infixL : Prec -> Str -> PrecExp -> PrecExp -> PrecExp = \p,f,x,y ->
{s = mkPrec (x.s ! p ++ f ++ y.s ! (nextPrec ! p)) ! p} ;
nextPrec : Prec => Prec = table {P0 => P1 ; P1 => P2 ; _ => P3} ;
mkPrec : Str -> Prec => Prec => Str = \str -> table {
P3 => table { -- use the term of precedence P3...
_ => str} ; -- ...always without parentheses
P2 => table { -- use the term of precedence P2...
P3 => paren str ; -- ...in parentheses if P3 is expected...
_ => str} ; -- ...otherwise without parentheses
P1 => table {
P3 | P2 => paren str ;
_ => str} ;
P0 => table {
P0 => str ;
_ => paren str}
nextPrec : Prec => Prec = table {
4 => 4 ;
n => Predef.plus n 1
} ;
mkPrec : Str -> Prec => Prec => Str = \str ->
\\p,q => case Predef.lessInt p q of {
Predef.PTrue => paren str ;
_ => str
} ;
-- string operations
SS : Type = {s : Str} ;