/// <summary>
/// Parser for Formals
/// </summary>
/// <param name="functionDefinition">functionDefinition to add formals to</param>
/// <returns>Parsed Formals</returns>
public void ParseFormals(FunctionDefinition functionDefinition)
{
if (TokenStream.Peek(1).GetValue().ToString() != "(")
{
return; //No formals, so return empty formals
}
//Skip ( token
NextToken("(","(formal1, formal2)",'(');
while (TokenStream.HasNext())
{ //Parse formals
if (TokenStream.Peek(1).GetValue().ToString() == ")")
{
break; //End of formals
}
else if(TokenStream.Peek(1).GetValue().ToString() == ",")
{
//Skip , token
NextToken(",", "(formal1, formal2)", ',');
}
functionDefinition.AddFormal(ParseFormal());
}
//Skip ) token
NextToken(")", "(formal1, formal2)", ')');
}
public void ParseFormalsTest()
{
FunctionParser functionParser = new FunctionParser(Init("(param1, param2)"));
FunctionDefinition functionDefinition = new FunctionDefinition();
functionParser.ParseFormals(functionDefinition);
//Test formals
Assert.AreEqual(2, functionDefinition.GetFormals().Count);
Formal[] formalArray = (Formal[]) functionDefinition.GetFormals().ToArray();
Assert.AreEqual("param1", formalArray[0].ToString());
Assert.AreEqual("param2", formalArray[1].ToString());
}
/// <summary>
/// Add an
/// </summary>
/// <param name="functionDefinition"></param>
public void AddFunctionDefinition(FunctionDefinition functionDefinition)
{
FunctionDefinitionList.Add(functionDefinition);
}
public virtual void Visit(FunctionDefinition functionDefinition)
{
VisitSubNodes(functionDefinition);
}
/// <summary>
/// Parser for FunctionDefinition
/// </summary>
/// <returns>Parsed FunctionDefinition</returns>
public FunctionDefinition ParseFunctionDefinition()
{
FunctionDefinition functionDefinition = new FunctionDefinition();
//Parse FunctionId
CurrentToken = TokenStream.NextToken();
functionDefinition.SetIdentifier(CurrentToken.GetValue().ToString());
//Parse Formals
ParseFormals(functionDefinition);
//Parse Statements
while (TokenStream.HasNext() && TokenStream.Peek(1).GetValue().ToString() != "end")
{
functionDefinition.AddStatement(statementParser.ParseStatement());
}
//Skip end token
NextToken("end", "def function() statements end", "end");
return functionDefinition;
}
/// <summary>
/// Visit FunctionDefinition to check declarations
/// </summary>
/// <param name="functionDefinition">FunctionDefinition to check</param>
public override void Visit(FunctionDefinition functionDefinition)
{
CreateChildSymbolTable();
//Check Formals
foreach(Formal formal in functionDefinition.GetFormals())
{
//Add variable, but with nullvalue, because value is undefined in definition
TextExpression textExpression = new TextExpression();
SymbolTable.AddVariableDefinition(formal.GetIdentifier(), textExpression);
}
//Check Statements of function
foreach (Statement statement in functionDefinition.GetStatements())
{
statement.AcceptVisitor(this);
}
MoveToParentSymbolTable();
}
/// <summary>
/// Visit FuncBindAssignment
/// </summary>
/// <param name="assignment">FuncBindAssignment to check</param>
public override void Visit(FuncBindAssignment assignment)
{
//FuncBind is a function, so let checking do by FunctionDefinition visitor
FunctionDefinition function = new FunctionDefinition();
function.SetIdentifier(assignment.GetIdentifier());
foreach (String identifier in assignment.GetIdentifiers())
{
Formal formal = new Formal();
formal.SetIdentifier(identifier);
function.AddFormal(formal);
}
function.AddStatement(assignment.GetStatement());
//Check this new function
function.AcceptVisitor(this);
//Add to SymbolTable
SymbolTable.AddFunctionDefinition(function);
}