1	import Base
2	import ../tensor_cursor.bend as Cursor
3	import ./storage_witness.bend as Witness
4	import ./traversal_visit_witness.bend as VisitWitness
5	
6	def read_value(~Element: Data,axes: Cursor.Levels(),address: U32,-storage: Array<Element>,-result: Array<Element> & Element,
7	  observed: Witness.Read<Element,storage,result>) ->
8	  VisitWitness.Sample<Array<Element>,Element,Cursor.Cursor,storage,Cursor.read_value(~Element,axes,address,result)>:
9	  match observed:
10	    case Witness.Read{value,equation}:
11	      %Equal.sym(Array<Element> & Element,result,(storage,value),equation) :
12	        VisitWitness.Sample<Array<Element>,Element,Cursor.Cursor,storage,Cursor.read_value(~Element,axes,address,_)>
13	      VisitWitness.Sample{Cursor.advance(axes,address),value,{==}}
14	
15	def read(~Element: Data,-storage: Array<Element>,cursor: Cursor.Cursor,evidence: Witness.ArrayWitness<Element,storage>) ->
16	  VisitWitness.Sample<Array<Element>,Element,Cursor.Cursor,storage,Cursor.read(~Element,storage,cursor)>:
17	  Cursor.Cursor{axes,+address} = cursor
18	  read_value(~Element,axes,address,storage,Array.get(Element,storage,address),Witness.observed(Element,storage,address,evidence))
19	
20	def stride_value(~Element: Data,address: U32,+stride: U32,-storage: Array<Element>,-result: Array<Element> & Element,
21	  observed: Witness.Read<Element,storage,result>) ->
22	  VisitWitness.Sample<Array<Element>,Element,Cursor.Stride,storage,Cursor.stride_value(~Element,address,stride,result)>:
23	  match observed:
24	    case Witness.Read{value,equation}:
25	      %Equal.sym(Array<Element> & Element,result,(storage,value),equation) :
26	        VisitWitness.Sample<Array<Element>,Element,Cursor.Stride,storage,Cursor.stride_value(~Element,address,stride,_)>
27	      VisitWitness.Sample{Cursor.Stride{(address + stride : U32),stride},value,{==}}
28	
29	def read_stride(~Element: Data,-storage: Array<Element>,cursor: Cursor.Stride,evidence: Witness.ArrayWitness<Element,storage>) ->
30	  VisitWitness.Sample<Array<Element>,Element,Cursor.Stride,storage,Cursor.read_stride(~Element,storage,cursor)>:
31	  Cursor.Stride{+address,+stride} = cursor
32	  stride_value(~Element,address,stride,storage,Array.get(Element,storage,address),Witness.observed(Element,storage,address,evidence))