/// <summary>
/// Creates a new instance of the <see cref="EvaluationContext"/> class.
/// </summary>
/// <param name="globalFunctions">The global functions of the evaluation context.</param>
/// <param name="globalVariables">The global variables of the evaluation context.</param>
/// <returns>A new immutable instance of the evaluation context.</returns>
public static EvaluationContext Create(FunctionsDictionary globalFunctions,
VariablesDictionary globalVariables)
{
return(new EvaluationContext(
new FunctionsDictionary(globalFunctions),
new VariablesDictionary(globalVariables))); // Makes them immutable
}
private EvaluationContext( // Private ctor forces the creation of evaluation context from Create method
FunctionsDictionary globalFunctions,
VariablesDictionary globalVariables) // Globals are only created once
{
_globalFunctions = globalFunctions;
_globalVariables = globalVariables;
}
/// <summary>
/// Adds a local <see cref="TemplateVariable"/> to the context under the supplied name,
/// overriding any existing <see cref="TemplateVariable"/> with the same name
/// </summary>
public void SetLocalVariable(string name, TemplateVariable variable)
{
if (_localVariables == null)
{
_localVariables = new VariablesDictionary();
}
_localVariables[name] = variable;
}
//IStatement
public void Execute()
{
if (!IsObject)
{
VariablesDictionary.SetVariable(variable, expression.Evaluate());
}
else
{
ExecuteArray();
}
}
private void ExecuteArray()
{
IObject obj = VariablesDictionary.GetObject(variable);
IObject result = obj;
GetIndexes();
for (int i = 0; i < indexes.Count; ++i)
{
if (i == indexes.Count - 1)
{
if (obj is ArrayIndex && indexes[i] is int)
{
((ArrayIndex)obj)[(int)indexes[i]] = getObject();
}
else if (obj is ArrayObject && indexes[i] is string)
{
((ArrayObject)obj)[(string)indexes[i]] = getObject();
}
else
{
throw new Exception("wrong index or type");
}
break;
}
if (obj is ArrayIndex && indexes[i] is int)
{
obj = ((ArrayIndex)obj)[(int)indexes[i]];
}
else if (obj is ArrayObject && indexes[i] is string)
{
obj = ((ArrayObject)obj)[(string)indexes[i]];
}
else
{
throw new Exception("wrong index or type");
}
}
VariablesDictionary.SetVariable(variable, result);
}
//IStatement
public void Execute()
{
VariablesDictionary.PutVariable(variable, expression.Evaluate());
}
/// <summary>
/// Initializes a new instance of the <see cref="EvaluationContext"/> class.
/// Making it private forces the creation of evaluation context from the
/// <see cref="Create(FunctionsDictionary, VariablesDictionary)"/> method.
/// </summary>
/// <param name="globalFunctions">The global functions of the evaluation context.</param>
/// <param name="globalVariables">The global variables of the evaluation context.</param>
private EvaluationContext(FunctionsDictionary globalFunctions, VariablesDictionary globalVariables)
{
_globalFunctions = globalFunctions;
_globalVariables = globalVariables;
}
public VariablesDictionary(VariablesDictionary dic) : base(dic, StringComparer.OrdinalIgnoreCase)
{
}
//default
private IExpressionData DefaultEvaluate()
{
IObject data = VariablesDictionary.GetObject(name);
return(getVariable(data));
}
