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Better variable declaration

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This commit is contained in:
Lukasz Baldyga committed 2020-11-29 09:50:06 +00:00
1 parent ccf6e204c6
commit 2b3beffdd4
1 file changed
+43 -12
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Advanced Software Engineering/Advanced Software Engineering/Verbs/Value/DeclareVariable.cs
+43 -12
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@@ -48,27 +48,58 @@ namespace Advanced_Software_Engineering.Verbs.Value {
public DeclareVariable(Drawer drawer, string type, string assignment) {
this.drawer = drawer;
if (drawer.CheckVariableExists(name)) throw new Exception("Declaration failed. " + name + " has been declared before");
if (!CheckName(name)) throw new Exception("Name not allowed");
//seperate assignment characters from everything else
foreach(string op in new string[]{ "=", "+", "-", "*", "/" }) {
assignment = assignment.Replace(op, " " + op + " ");
}
// get variable name
// assignment looks something like this at this point:
// i = 20
// or
// i = 2 == 5
// i = 2 = 5
// so after splitting it should look like
// ["i", "=", "20"]
assignment = HelperFunctions.Strip(assignment);
// bools have ==
if (!(type == "bool")) {
//Seperate the assignment from the variables
List<string> assignmentList = HelperFunctions.StripStringArray(assignment.Split("="[0]));
name = assignmentList[0];
value = ValueFactory.CreateValue(assignmentList[1], type);
} else {
//boolean here
throw new NotImplementedException("Booleans cannot be parsed yet");
//seperate on spaces
string[] assignmentStrings = HelperFunctions.StripStringArray(assignment.Split(" "[0])).ToArray();
//check if is actually assignment
if (!(assignmentStrings[1] == "=")) throw new Exception("No assignment in " + assignment);
name = assignmentStrings[0];
if (drawer.CheckVariableExists(name)) throw new Exception("Declaration failed. " + name + " has been declared before");
if (!CheckName(name)) throw new Exception("'" + name + "' name not allowed");
//for single number assignments ["i", "=", "20"]
if (assignmentStrings.Length == 3) value = ValueFactory.CreateValue(drawer, assignmentStrings[2]);
//for expressions ["i", "=", "20", "+", "30"]
//or some comparisons ["i", "=", "20", ">", "30"]
if (assignmentStrings.Length == 5) {
string op = assignmentStrings[3];
IValue value1 = ValueFactory.CreateValue(drawer, assignmentStrings[2]);
IValue value2 = ValueFactory.CreateValue(drawer, assignmentStrings[4]);
switch (op) {
case "+":
case "-":
case "/":
case "*":
value = new ExpressionValue(drawer, value1, value2, op);
break;
case ">":
case "<":
case "=":
case "!":
throw new Exception("Not implemented yet");
}
}
}
public void ExecuteVerb() {
drawer.SetVariable(name, value);
}