174 lines
3.7 KiB
Forth
174 lines
3.7 KiB
Forth
\ #if (FICL_WANT_OOP)
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\ ** ficl/softwords/classes.fr
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\ ** F I C L 2 . 0 C L A S S E S
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\ john sadler 1 sep 98
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\ Needs oop.fr
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\
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\ $FreeBSD$
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also oop definitions
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\ REF subclass holds a pointer to an object. It's
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\ mainly for aggregation to help in making data structures.
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\
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object subclass c-ref
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cell: .class
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cell: .instance
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: get ( inst class -- refinst refclass )
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drop 2@ ;
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: set ( refinst refclass inst class -- )
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drop 2! ;
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end-class
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object subclass c-byte
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char: .payload
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: get drop c@ ;
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: set drop c! ;
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end-class
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object subclass c-2byte
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2 chars: .payload
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: get drop w@ ;
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: set drop w! ;
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end-class
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object subclass c-4byte
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4 chars: .payload
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: get drop q@ ;
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: set drop q! ;
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end-class
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object subclass c-cell
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cell: .payload
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: get drop @ ;
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: set drop ! ;
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end-class
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\ ** C - P T R
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\ Base class for pointers to scalars (not objects).
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\ Note: use c-ref to make references to objects. C-ptr
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\ subclasses refer to untyped quantities of various sizes.
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\ Derived classes must specify the size of the thing
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\ they point to, and supply get and set methods.
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\ All derived classes must define the @size method:
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\ @size ( inst class -- addr-units )
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\ Returns the size in address units of the thing the pointer
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\ refers to.
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object subclass c-ptr
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c-cell obj: .addr
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\ get the value of the pointer
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: get-ptr ( inst class -- addr )
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c-ptr => .addr
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c-cell => get
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;
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\ set the pointer to address supplied
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: set-ptr ( addr inst class -- )
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c-ptr => .addr
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c-cell => set
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;
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\ force the pointer to be null
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: clr-ptr
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0 -rot c-ptr => .addr c-cell => set
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;
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\ return flag indicating null-ness
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: ?null ( inst class -- flag )
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c-ptr => get-ptr 0=
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;
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\ increment the pointer in place
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: inc-ptr ( inst class -- )
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2dup 2dup ( i c i c i c )
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c-ptr => get-ptr -rot ( i c addr i c )
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--> @size + -rot ( addr' i c )
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c-ptr => set-ptr
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;
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\ decrement the pointer in place
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: dec-ptr ( inst class -- )
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2dup 2dup ( i c i c i c )
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c-ptr => get-ptr -rot ( i c addr i c )
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--> @size - -rot ( addr' i c )
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c-ptr => set-ptr
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;
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\ index the pointer in place
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: index-ptr { index 2:this -- }
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this --> get-ptr ( addr )
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this --> @size index * + ( addr' )
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this --> set-ptr
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;
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end-class
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\ ** C - C E L L P T R
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\ Models a pointer to cell (a 32 or 64 bit scalar).
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c-ptr subclass c-cellPtr
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: @size 2drop 1 cells ;
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\ fetch and store through the pointer
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: get ( inst class -- cell )
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c-ptr => get-ptr @
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;
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: set ( value inst class -- )
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c-ptr => get-ptr !
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;
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end-class
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\ ** C - 4 B Y T E P T R
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\ Models a pointer to a quadbyte scalar
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c-ptr subclass c-4bytePtr
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: @size 2drop 4 ;
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\ fetch and store through the pointer
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: get ( inst class -- value )
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c-ptr => get-ptr q@
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;
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: set ( value inst class -- )
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c-ptr => get-ptr q!
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;
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end-class
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\ ** C - 2 B Y T E P T R
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\ Models a pointer to a 16 bit scalar
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c-ptr subclass c-2bytePtr
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: @size 2drop 2 ;
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\ fetch and store through the pointer
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: get ( inst class -- value )
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c-ptr => get-ptr w@
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;
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: set ( value inst class -- )
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c-ptr => get-ptr w!
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;
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end-class
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\ ** C - B Y T E P T R
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\ Models a pointer to an 8 bit scalar
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c-ptr subclass c-bytePtr
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: @size 2drop 1 ;
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\ fetch and store through the pointer
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: get ( inst class -- value )
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c-ptr => get-ptr c@
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;
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: set ( value inst class -- )
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c-ptr => get-ptr c!
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;
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end-class
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previous definitions
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\ #endif
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