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de.cm.frw.core.fun.impl
Class LP

java.lang.Object
  extended by de.cm.frw.core.fun.impl.LP

public class LP
extends java.lang.Object

LP collects some utilities for processing lists in a LISP like fashion in order to support taking over existing LISP code

Author:
cm

Nested Class Summary
static class LP.ConsCell
          A functional implementation of an (immutable) cons cell where values for car and cdr are captured in a closure when the cons cell function is created.
static class LP.ConsPair
          Use a ConsCell to implement Pair
static class LP.EmptyConsCell
           
static class LP.List
           
 
Field Summary
static Function append
           
static Function car
           
static Function cdr
           
static Function cons
          The cons function creates a cons cell with the given objects
static Function filter
           
static Function list
          The list function takes 0 or more arguments to form a list made from cons cells
static Function reduce
           
 
Constructor Summary
LP()
           
 
Method Summary
static LP.ConsCell append(java.util.Collection lists)
           
static java.lang.Object car(java.lang.Object stream)
           
static java.lang.Object cdr(java.lang.Object stream)
           
static java.lang.Object cons(java.lang.Object a, java.lang.Object b)
           
static LP.ConsCell drop(Predicate pred, LP.ConsCell lst)
           
static LP.ConsCell filter(Predicate pred, LP.ConsCell lst)
           
static boolean isEmptyList(java.lang.Object stream)
           
static java.lang.Object iterRef(java.lang.Object stream, int n)
           
static LP.ConsCell keep(Predicate pred, LP.ConsCell lst)
           
static java.lang.Object listRef(java.lang.Object stream, int n)
           
static java.lang.Object makeEmptyList()
           
static Function mapcan(Function f, Function lst)
           
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

car

public static final Function car

cdr

public static final Function cdr

cons

public static final Function cons
The cons function creates a cons cell with the given objects

list

public static final Function list
The list function takes 0 or more arguments to form a list made from cons cells

reduce

public static final Function reduce

append

public static final Function append

filter

public static Function filter
Constructor Detail

LP

public LP()
Method Detail

mapcan

public static Function mapcan(Function f,
                              Function lst)
                       throws Function.InvalidArguments
Throws:
Function.InvalidArguments

append

public static LP.ConsCell append(java.util.Collection lists)
                          throws Function.InvalidArguments
Throws:
Function.InvalidArguments

isEmptyList

public static boolean isEmptyList(java.lang.Object stream)
                           throws Function.InvalidArguments
Throws:
Function.InvalidArguments

makeEmptyList

public static java.lang.Object makeEmptyList()
                                      throws Function.InvalidArguments
Throws:
Function.InvalidArguments

car

public static java.lang.Object car(java.lang.Object stream)
                            throws Function.InvalidArguments
Throws:
Function.InvalidArguments

cdr

public static java.lang.Object cdr(java.lang.Object stream)
                            throws Function.InvalidArguments
Throws:
Function.InvalidArguments

listRef

public static java.lang.Object listRef(java.lang.Object stream,
                                       int n)
                                throws Function.InvalidArguments
Throws:
Function.InvalidArguments

iterRef

public static java.lang.Object iterRef(java.lang.Object stream,
                                       int n)
                                throws Function.InvalidArguments
Throws:
Function.InvalidArguments

filter

public static LP.ConsCell filter(Predicate pred,
                                 LP.ConsCell lst)
                          throws Function.InvalidArguments
Throws:
Function.InvalidArguments

keep

public static LP.ConsCell keep(Predicate pred,
                               LP.ConsCell lst)
                        throws Function.InvalidArguments
Throws:
Function.InvalidArguments

drop

public static LP.ConsCell drop(Predicate pred,
                               LP.ConsCell lst)
                        throws Function.InvalidArguments
Throws:
Function.InvalidArguments

cons

public static java.lang.Object cons(java.lang.Object a,
                                    java.lang.Object b)
                             throws Function.InvalidArguments
Throws:
Function.InvalidArguments
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