public static void Evaluate(ParsedExpressionList expressionList, SDFState state)
{
Object lastExpressionObject = null;
foreach (Object o in expressionList)
{
if (o is ParsedExpressionList)
{
if (lastExpressionObject != null)
{
state += lastExpressionObject;
try
{
Evaluate((ParsedExpressionList) o, state);
}
finally
{
state -= lastExpressionObject;
}
lastExpressionObject = null;
}
}
else
{
ParsedExpression expression = (ParsedExpression) o;
MethodInfo method = expression.Expression.GetType().GetMethod("Evaluate");
lastExpressionObject = method.Invoke(expression.Expression, new Object[] { state, expression.ExpressionName, expression.Arguments });
}
}
}
public static ParsedExpressionList Parse(string expressions)
{
Regex regex = new Regex(@"\n?(?<indent>[ \t]*)(?<expression>\S+)(\s+(?<name>[^ \t=]+)\s*=\s*'(?<value>[^']+)')*");
ParsedExpressionList currentList = new ParsedExpressionList();
ParsedExpressionList rootList = currentList;
int lastIndentLevel = -1;
Stack expressionListStack = new Stack();
foreach (Match match in regex.Matches(expressions))
{
string expression = null;
Hashtable arguments = null;
int currentIndentLevel = match.Groups["indent"].Length;
{
Group names = match.Groups["name"];
Group values = match.Groups["value"];
expression = match.Groups["expression"].ToString();
arguments = new Hashtable(names.Captures.Count);
for (int counter = 0;counter < names.Captures.Count;++counter)
{
arguments[names.Captures[counter].ToString()] = values.Captures[counter].ToString();
}
}
if (lastIndentLevel == -1)
{
lastIndentLevel = currentIndentLevel;
}
if (currentIndentLevel > lastIndentLevel)
{
ParsedExpressionList lastList = currentList;
// Push the current guy on the stack, set up a new one
expressionListStack.Push(currentList);
currentList = new ParsedExpressionList();
lastList += currentList;
}
else if (currentIndentLevel < lastIndentLevel)
{
// Pop lists until we get to this level
while (currentIndentLevel < currentList.IndentLevel)
{
currentList = (ParsedExpressionList) expressionListStack.Pop();
}
}
currentList += new ParsedExpression(expression, arguments, currentIndentLevel);
lastIndentLevel = currentIndentLevel;
}
return rootList;
}
public void AddExpressionList(ParsedExpressionList parsedExpressionList)
{
this.expressionList.Add(parsedExpressionList);
}
public void PostCreateExpression(SDFState state, string name, Hashtable arguments, ParsedExpressionList children)
{
this.rootExpressionChildren = children;
}
public void PostCreateExpression(SDFState state, string name, Hashtable arguments, ParsedExpressionList children)
{
((ExpressionRegistry) state[typeof(ExpressionRegistry)]).AddAssembly(arguments["filename"].ToString());
}
public static void Load(ParsedExpressionList expressionList, SDFState state, ProvidedStatePile parentExpressionStatePile)
{
ExpressionRegistry expressions = (ExpressionRegistry) state[typeof(ExpressionRegistry)];
ParsedExpression expression = null;
TokenStringRegistry tokenStringRegistry = (TokenStringRegistry) state[typeof(TokenStringRegistry)];
foreach (Object o in expressionList)
{
if (o is ParsedExpressionList)
{
MaybeCallPostCreateExpression(state, expression, (ParsedExpressionList) o);
parentExpressionStatePile.AddProvidedStateFromObject(expression.Expression);
expression = null;
Load((ParsedExpressionList) o, state, parentExpressionStatePile);
parentExpressionStatePile.RemoveLastProvidedState();
}
else
{
if (expression != null)
{
MaybeCallPostCreateExpression(state, expression, null);
}
expression = (ParsedExpression) o;
BindArguments(expression.Arguments, tokenStringRegistry);
{
object newObject = null;
object foundObject = expressions[expression.ExpressionName];
Type type = foundObject as Type;
if ((foundObject != null) && (type == null))
{
type = foundObject.GetType();
}
if (type == null)
{
throw new SDFException(String.Format("Unknown expression '{0}'", expression.ExpressionName));
}
{
MethodInfo method = type.GetMethod("CreateExpression");
if (method != null)
{
newObject = method.Invoke(foundObject, new Object[] { state, expression.ExpressionName, expression.Arguments });
type = newObject.GetType();
}
else
{
newObject = type.GetConstructor(new Type[0]).Invoke(null);
}
}
{
// On the class, see if there are SDFArgument attributes
foreach (SDFArgumentAttribute argument in type.GetCustomAttributes(typeof(SDFArgumentAttribute), false))
{
// If the argument is required, then whine if it wasn't specified
if ((argument.Required) && (!expression.Arguments.Contains(argument.Name)))
{
throw new SDFException(String.Format("Rquired argument '{0}' was not specified", argument.Name));
}
}
}
// Set arguments to properties if required
{
// For each property, check to see if it has an SDFArgument attribute
foreach (PropertyInfo property in type.GetProperties())
{
foreach (SDFArgumentAttribute argument in property.GetCustomAttributes(typeof(SDFArgumentAttribute), false))
{
// If the argument is required, then whine if it wasn't specified
if ((argument.Required) && (!expression.Arguments.Contains(property.Name)))
{
throw new SDFException(String.Format("Rquired argument '{0}' was not specified", property.Name));
}
// Set the property
property.GetSetMethod().Invoke(newObject, new Object[] { expression.Arguments[property.Name] });
}
}
}
{
MethodInfo method = type.GetMethod("Evaluate");
// Now check to see if there's any required state
foreach (SDFStateRequiredAttribute stateRequired in method.GetCustomAttributes(typeof(SDFStateRequiredAttribute), false))
{
if ((state[stateRequired.RequiredType] == null) && (!parentExpressionStatePile.Contains(stateRequired.RequiredType)))
{
throw new SDFException(String.Format("Required state '{0}' was not found", stateRequired.RequiredType.Name));
}
}
}
expression.Expression = newObject;
}
}
}
if (expression != null)
{
MaybeCallPostCreateExpression(state, expression, null);
expression = null;
}
}
private static void MaybeCallPostCreateExpression(SDFState state, ParsedExpression expression, ParsedExpressionList children)
{
MethodInfo postCreateMethod = expression.Expression.GetType().GetMethod("PostCreateExpression");
if (postCreateMethod != null)
{
postCreateMethod.Invoke(expression.Expression, new Object[] { state, expression.ExpressionName, expression.Arguments, children });
}
}
