//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////// Right Hand Expressions Implementations /////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
#region Right Hand Expressions Implementations
public override LLVMRegister VisitVariableAssignment([NotNull] ClepsParser.VariableAssignmentContext context)
{
string variableName = context.variable().VariableName.Text;
LLVMRegister ret = VariableManager.GetVariable(variableName);
return(ret);
}
public override object VisitVariableAssignment([NotNull] ClepsParser.VariableAssignmentContext context)
{
IValueRegister register = GetVariableRegister(context);
if (register == null)
{
return(false);
}
IValue variableValue = CodeGenerator.GetRegisterValue(register);
return(variableValue);
}
public override object VisitVariableAssignment([NotNull] ClepsParser.VariableAssignmentContext context)
{
IValueRegister register = GetVariableRegisterOrNullWithError(context);
IValue variableValue;
if (register == null)
{
//Error occurred finding the register. Return some value to avoid stopping the compilation
variableValue = CodeGenerator.CreateByte(0);
}
else
{
variableValue = CodeGenerator.GetRegisterValue(register);
}
return(variableValue);
}
private IValueRegister GetVariableRegisterOrNullWithError([NotNull] ClepsParser.VariableAssignmentContext context)
{
string variableName = Visit(context.variable()) as string;
var variableManager = VariableManagers.Last();
IValueRegister register;
if (!variableManager.IsVariableAvailable(variableName))
{
string errorMessage = String.Format("Variable {0} does not exist", variableName);
Status.AddError(new CompilerError(FileName, context.Start.Line, context.Start.Column, errorMessage));
register = null;
}
else
{
register = variableManager.GetVariableRegister(variableName);
}
return(register);
}
/// <summary>
/// Exit a parse tree produced by <see cref="ClepsParser.variableAssignment"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitVariableAssignment([NotNull] ClepsParser.VariableAssignmentContext context)
{
}
/// <summary>
/// Visit a parse tree produced by <see cref="ClepsParser.variableAssignment"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitVariableAssignment([NotNull] ClepsParser.VariableAssignmentContext context)
{
return(VisitChildren(context));
}