update README

Author: felixbd

README.org

@@ -7,6 +7,66 @@ Parser and interpreter for the While programming language
 
 ** usage
 
+*** example
+
+#+begin_src shell
+felix in ~/git-repos/hub/while on main λ stack run
+
+ = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
+
+[READING .WHILE FILE] "./examples/simple.while"
+[MetaToken {getLineNumber = 1, getToken = VarToken {getVarName = "x_1"}},
+ MetaToken {getLineNumber = 1, getToken = AssignToken},
+ MetaToken {getLineNumber = 1, getToken = ConstToken {getConstInt = 10}},
+ MetaToken {getLineNumber = 1, getToken = SemicolonToken},
+ MetaToken {getLineNumber = 2, getToken = VarToken {getVarName = "x_2"}},
+ MetaToken {getLineNumber = 2, getToken = AssignToken},
+ MetaToken {getLineNumber = 2, getToken = ConstToken {getConstInt = 0}},
+ MetaToken {getLineNumber = 2, getToken = SemicolonToken},
+ MetaToken {getLineNumber = 4, getToken = WhileToken},
+ MetaToken {getLineNumber = 4, getToken = VarToken {getVarName = "x_1"}},
+ MetaToken {getLineNumber = 4, getToken = NotEqualToken},
+ MetaToken {getLineNumber = 4, getToken = ConstToken {getConstInt = 0}},
+ MetaToken {getLineNumber = 4, getToken = DoToken},
+ MetaToken {getLineNumber = 5, getToken = VarToken {getVarName = "x_1"}},
+ MetaToken {getLineNumber = 5, getToken = AssignToken},
+ MetaToken {getLineNumber = 5, getToken = VarToken {getVarName = "x_1"}},
+ MetaToken {getLineNumber = 5, getToken = MinusToken},
+ MetaToken {getLineNumber = 5, getToken = ConstToken {getConstInt = 1}},
+ MetaToken {getLineNumber = 5, getToken = SemicolonToken},
+ MetaToken {getLineNumber = 6, getToken = LoopToken},
+ MetaToken {getLineNumber = 6, getToken = VarToken {getVarName = "x_1"}},
+ MetaToken {getLineNumber = 6, getToken = DoToken},
+ MetaToken {getLineNumber = 6, getToken = VarToken {getVarName = "x_2"}},
+ MetaToken {getLineNumber = 6, getToken = AssignToken},
+ MetaToken {getLineNumber = 6, getToken = VarToken {getVarName = "x_2"}},
+ MetaToken {getLineNumber = 6, getToken = PlusToken},
+ MetaToken {getLineNumber = 6, getToken = VarToken {getVarName = "x_1"}},
+ MetaToken {getLineNumber = 6, getToken = EndToken},
+ MetaToken {getLineNumber = 7, getToken = EndToken}]
+
+ = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
+
+Sequential
+	(Assignment "x_1" (Constant {getConst = 10}))
+	(Sequential
+		(Assignment "x_2" (Constant {getConst = 0}))
+		(While
+			(Neq (Variable {getVar = "x_1"}) (Constant {getConst = 0}))
+				(Sequential
+					(Assignment "x_1" (Subtract (Variable {getVar = "x_1"}) (Constant {getConst = 1})))
+					(Loop
+						(Variable {getVar = "x_1"})
+						(Assignment "x_2" (Add (Variable {getVar = "x_2"}) (Variable {getVar = "x_1"})))))))
+
+ = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
+
+[OUTPUT]:
+[("x_2",285),("x_1",0)]
+
+ = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
+#+end_src
+
 *** compile
 
 #+begin_src shell