new tester; all tests categorized

tests/object/toop1.nim

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+discard """
+  file: "toop1.nim"
+  output: "34[]o 5"
+"""
+# Test the stuff in the tutorial
+import macros
+
+type
+  TFigure = object of TObject    # abstract base class:
+    draw: proc (my: var TFigure) {.nimcall.} # concrete classes implement this
+  
+proc init(f: var TFigure) = 
+  f.draw = nil
+
+type
+  TCircle = object of TFigure
+    radius: int
+  
+proc drawCircle(my: var TCircle) = stdout.writeln("o " & $my.radius)
+
+proc init(my: var TCircle) = 
+  init(TFigure(my)) # call base constructor
+  my.radius = 5
+  my.draw = cast[proc (my: var TFigure) {.nimcall.}](drawCircle)
+
+type
+  TRectangle = object of TFigure
+    width, height: int
+
+proc drawRectangle(my: var TRectangle) = stdout.write("[]")
+
+proc init(my: var TRectangle) = 
+  init(TFigure(my)) # call base constructor
+  my.width = 5
+  my.height = 10
+  my.draw = cast[proc (my: var TFigure) {.nimcall.}](drawRectangle)
+
+macro `!` (n: expr): stmt {.immediate.} = 
+  let n = callsite()
+  result = newNimNode(nnkCall, n)
+  var dot = newNimNode(nnkDotExpr, n)
+  dot.add(n[1])    # obj
+  if n[2].kind == nnkCall:
+    # transforms ``obj!method(arg1, arg2, ...)`` to
+    # ``(obj.method)(obj, arg1, arg2, ...)``
+    dot.add(n[2][0]) # method
+    result.add(dot)
+    result.add(n[1]) # obj
+    for i in 1..n[2].len-1:
+      result.add(n[2][i])
+  else:
+    # transforms ``obj!method`` to
+    # ``(obj.method)(obj)``
+    dot.add(n[2]) # method
+    result.add(dot)
+    result.add(n[1]) # obj
+
+type
+  TSocket* = object of TObject
+    FHost: int # cannot be accessed from the outside of the module
+               # the `F` prefix is a convention to avoid clashes since
+               # the accessors are named `host`
+               
+proc `host=`*(s: var TSocket, value: int) {.inline.} = 
+  ## setter of hostAddr
+  s.FHost = value
+
+proc host*(s: TSocket): int {.inline.} =
+  ## getter of hostAddr
+  return s.FHost
+  
+var 
+  s: TSocket
+s.host = 34  # same as `host=`(s, 34)
+stdout.write(s.host)
+
+# now use these classes:
+var
+  r: TRectangle
+  c: TCircle
+init(r)
+init(c)
+r!draw
+c!draw() 
+
+#OUT 34[]o 5
+
+
+