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############################################################################
#
# Name: sklist.icn
#
# Title: Scheme in Icon
#
# Author: Bob Alexander
#
# Date: March 23, 1995
#
# Description: see skeem.icn
#
############################################################################
#
# skeem -- Scheme in Icon
#
# List and vector procedures
#
#
# Initialize
#
# List entries are described in skfun.icn.
#
procedure InitList()
DefFunction([
APPEND,&null,
ASSOC,2,
ASSQ,2,
ASSV,2,
CAR,
CDR,
CONS,2,
CXXR,"CAAR",
CXXR,"CADR",
CXXR,"CDAR",
CXXR,"CDDR",
CXXR,"CAAAR",
CXXR,"CAADR",
CXXR,"CADAR",
CXXR,"CADDR",
CXXR,"CDAAR",
CXXR,"CDADR",
CXXR,"CDDAR",
CXXR,"CDDDR",
CXXR,"CAAAAR",
CXXR,"CAAADR",
CXXR,"CAADAR",
CXXR,"CAADDR",
CXXR,"CADAAR",
CXXR,"CADADR",
CXXR,"CADDAR",
CXXR,"CADDDR",
CXXR,"CDAAAR",
CXXR,"CDAADR",
CXXR,"CDADAR",
CXXR,"CDADDR",
CXXR,"CDDAAR",
CXXR,"CDDADR",
CXXR,"CDDDAR",
CXXR,"CDDDDR",
LENGTH,
LIST,&null,
LIST_2_VECTOR,
LIST_P,
LIST_REF,2,
LIST_TAIL,2,
MAKE_VECTOR,1,2,
MEMBER,2,
MEMQ,2,
MEMV,2,
NULL_P,
PAIR_P,
REVERSE,
SET_CAR_BANG,2,
SET_CDR_BANG,2,
VECTOR,&null,
VECTOR_2_LIST,
VECTOR_FILL_BANG,2,
VECTOR_LENGTH,
VECTOR_P,
VECTOR_REF,2,
VECTOR_SET_BANG,3])
return
end
#
# Pairs and lists.
#
procedure PAIR_P(x)
return (LLIsPair(x),T) | F
end
procedure CONS(first,rest)
return LLPair(first,rest)
end
procedure CAR(pair)
return LLFirst(pair)
end
procedure CDR(pair)
return LLRest(pair)
end
procedure SET_CAR_BANG(pair,value)
return LLFirst(pair) := value
end
procedure SET_CDR_BANG(pair,value)
return LLRest(pair) := value
end
## procedure ArgErr(fName,argList,msg,argNbr)
## /argNbr := 1
## return Error(fName,"bad argument ",argNbr,": ",
## Print(LLElement(argList,argNbr))," -- " || \msg | "")
## end
procedure CXXR(lst)
local result,c
result := lst
every c := !reverse(FuncName[2:-1]) do {
result := (if c == "A" then LLFirst else LLRest)(result)
}
return result
end
procedure NULL_P(x)
return (LLIsNull(x),T) | F
end
procedure LIST_P(x)
local beenThere
beenThere := set()
while LLIsPair(x) do {
if member(beenThere,x) then break
insert(beenThere,x)
x := LLRest(x)
}
return (LLIsNull(x),T) | F
end
procedure LIST(x[])
return LList!x
end
procedure LENGTH(lst)
return LLLength(lst)
end
procedure APPEND(lst[])
return LLAppend!lst
end
procedure REVERSE(lst)
return LLReverse(lst)
end
procedure LIST_TAIL(lst,i)
return LLTail(lst,i + 1)
end
procedure LIST_REF(lst,i)
return LLElement(lst,i + 1)
end
invocable "===":2
procedure MEMQ(lst,x)
static eq
initial eq := proc("===",2)
return Member(eq,lst,x) | F
end
procedure MEMV(lst,x)
return Member(Eqv,lst,x) | F
end
procedure MEMBER(lst,x)
return Member(Equal,lst,x) | F
end
procedure Member(test,obj,L)
return if /L then fail else (test(obj,LLFirst(L)),L) | Member(test,obj,LLRest(L))
end
invocable "===":2
procedure ASSQ(alst,x)
static eq
initial eq := proc("===",2)
return Assoc(eq,alst,x) | F
end
procedure ASSV(alst,x)
return Assoc(Eqv,alst,x) | F
end
procedure ASSOC(alst,x)
return Assoc(Equal,alst,x) | F
end
procedure Assoc(test,obj,L)
return if /L then fail else (test(obj,LLFirst(LLFirst(L))),LLFirst(L)) |
Assoc(test,obj,LLRest(L))
end
#
# Vectors
#
procedure VECTOR_P(x)
return (VectorP(x),T) | F
end
procedure MAKE_VECTOR(len,value[])
return list(len,value[1] | F)
end
procedure VECTOR(x[])
return x
end
procedure VECTOR_LENGTH(vec)
return *vec
end
procedure VECTOR_REF(vec,i)
return vec[i + 1]
end
procedure VECTOR_SET_BANG(vec,i,value)
return vec[i + 1] := value
end
procedure VECTOR_2_LIST(vec)
return LList!vec
end
procedure LIST_2_VECTOR(lst)
return LLToList(lst)
end
procedure VECTOR_FILL_BANG(vec,value)
every !vec := value
return vec
end
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