private int ParseReferenceObjectAccess(CompilationContext compilationContext, Token currentToken,
List<Token> tokens, int index, ref IActionNode currentParent)
{
int varIndex = currentToken.GetAccessIndex(m_Engine.HostBridge.EnumDefineTable);
// Map enums to their index counterparts
if (currentToken.Type == TokenType.ReferenceObjectAccessEnum)
currentToken.Type = TokenType.ReferenceObjectAccess;
currentToken = tokens[++index]; // Assignment or Property set or Action only
Token operand = currentToken;
Expression expression;
if (currentToken.Type == TokenType.ReferencePropertySet)
{
currentToken = tokens[++index];
AssertExpectedTokenType(currentToken, TokenType.Assignment, "Unexpected token");
currentToken = tokens[++index];
int skip = ParseExpression(index, tokens, compilationContext, out expression);
index += skip;
currentToken = tokens[index];
ReferenceAssignment assignment = compilationContext.ReferenceAssignmentTable.GetAssignment(varIndex);
if (!m_Engine.HostBridge.TypeBindingTable.SetPropertyExists(operand.Value, assignment.Type))
throw new GossipScriptException(String.Format("Property {0} not found or is read only.",
operand.Value));
PropertySetBinding setter = m_Engine.HostBridge.TypeBindingTable.GetPropertySetByName(operand.Value,
assignment.Type);
if (setter.ParameterType != expression.ReturnType)
throw new GossipScriptException("Incompatile property set parameter");
currentParent.Next = new AssignReferenceProperty(varIndex, setter.Id, expression);
currentParent = currentParent.Next;
return index;
}
if (currentToken.Type == TokenType.Assignment)
{
currentToken = tokens[++index];
int skip = ParseExpression(index, tokens, compilationContext, out expression);
index += skip;
currentToken = tokens[index];
compilationContext.ReferenceAssignmentTable.TrackReference(varIndex, expression.HostReturnType);
if (expression.ReturnType != GossipType.ReferenceObject)
throw new GossipScriptException("Expected return type reference object");
// Create the assignment command
currentParent.Next = new AssignReference(varIndex, expression);
currentParent = currentParent.Next;
return index;
}
// Parse Action
{
int skip = ParseExpression(index - 1, tokens, compilationContext, out expression);
index += (skip);
currentToken = tokens[index - 1];
if (currentToken.Type == TokenType.ReferenceAction)
{
// Create an action
ReferenceAssignment actionType = compilationContext.ReferenceAssignmentTable.GetAssignment(varIndex);
ActionBinding action = compilationContext.TypeBindingTable.GetActionByName(currentToken.Value,
actionType.Type);
ICustomActionNode node = action.CreateActionNode();
int refIndex = varIndex; // Unless the expression result is
List<Expression> expressions;
skip = ParseActionParameters(index, tokens, compilationContext, out expressions);
if (action.NumParameters != expressions.Count)
throw new GossipScriptParameterException(
String.Format("Invalid number of parameters for action:{0} found:{1} expected:{2}",
action.Name, expressions.Count, action.NumParameters));
var customActionContext = new CustomActionContext(expressions, refIndex);
currentParent.Next = new ExecuteCustomActionNode(node, customActionContext);
currentParent = currentParent.Next;
index += (skip + 1);
currentToken = tokens[index];
return index;
}
}
throw new GossipScriptException("Unhandled operand");
}
private int ParseVariableAccess(CompilationContext compilationContext, Token currentToken, List<Token> tokens,
int index, ref IActionNode currentParent)
{
int varIndex = currentToken.GetAccessIndex(m_Engine.HostBridge.EnumDefineTable);
// Map enums to their index counterparts
if (currentToken.Type == TokenType.LocalVariableAccessEnum)
currentToken.Type = TokenType.LocalVariableAccess;
if (currentToken.Type == TokenType.GlobalVariableAccessEnum)
currentToken.Type = TokenType.GlobalVariableAccess;
// Global or local?
var op = TokenType.GlobalVariableAccess;
if (currentToken.Type == TokenType.LocalVariableAccess)
op = TokenType.LocalVariableAccess;
currentToken = tokens[++index]; // Assignment or increment or decrement
if (currentToken.Value != "=" && currentToken.Value != "++" && currentToken.Value != "--" &&
currentToken.Value != "+=" && currentToken.Value != "-=")
throw new GossipScriptException("Unexpected Token following variable access", currentToken);
if (currentToken.Value == "++")
{
currentParent.Next = new ModifyVariable(varIndex, op, TokenType.Increment, 1);
currentParent = currentParent.Next;
return index;
}
if (currentToken.Value == "--")
{
currentParent.Next = new ModifyVariable(varIndex, op, TokenType.Decrement, 1);
currentParent = currentParent.Next;
return index;
}
if (currentToken.Type == TokenType.Assignment || currentToken.Type == TokenType.IncrementAndAssign ||
currentToken.Type == TokenType.DecrementAndAssign)
{
TokenType tokenType = currentToken.Type;
currentToken = tokens[++index]; // First token after assignment
Expression expression;
int skip = ParseExpression(index, tokens, compilationContext, out expression);
if (expression.ReturnType != GossipType.Number)
throw new GossipScriptException(String.Format("Invalid return type:{0}, Expected Number",
expression.ReturnType));
index += skip;
currentToken = tokens[index];
// Specal case
if (op == TokenType.LocalVariableAccess && currentToken.Type == TokenType.Assignment &&
expression.Instructions.Count == 1)
{
currentParent.Next = new AssignLocalVariableWithLiteral(varIndex,
Convert.ToDouble(
expression.Instructions[0].Data));
currentParent = currentParent.Next;
return index;
}
// Generic Case
currentParent.Next = new AssignVariable(varIndex, op, tokenType, expression);
currentParent = currentParent.Next;
return index;
}
return index;
}
private int ParseFlagAccess(CompilationContext compilationContext, Token currentToken, List<Token> tokens,
int index, ref IActionNode currentParent)
{
int varIndex = currentToken.GetAccessIndex(m_Engine.HostBridge.EnumDefineTable);
// Map enums to their index counterparts
if (currentToken.Type == TokenType.LocalFlagAccessEnum)
currentToken.Type = TokenType.LocalFlagAccess;
if (currentToken.Type == TokenType.GlobalFlagAccessEnum)
currentToken.Type = TokenType.GlobalFlagAccess;
// Global or local?
var op = TokenType.GlobalFlagAccess;
if (currentToken.Type == TokenType.LocalFlagAccess)
op = TokenType.LocalFlagAccess;
currentToken = tokens[++index]; // Assignment
AssertExpectedTokenType(currentToken, TokenType.Assignment, "Expected Assignment");
currentToken = tokens[++index];
Expression expression;
int skip = ParseExpression(index, tokens, compilationContext, out expression);
index += skip;
currentToken = tokens[index];
// Create the assignment command
currentParent.Next = new ModifyFlag(varIndex, op, expression);
currentParent = currentParent.Next;
return index;
}
private int ParseStringAccess(CompilationContext compilationContext, Token currentToken, List<Token> tokens,
int index, ref IActionNode currentParent)
{
int destIndex = currentToken.GetAccessIndex(m_Engine.HostBridge.EnumDefineTable);
// Map enums to their index counterparts
if (currentToken.Type == TokenType.LocalStringAccessEnum)
currentToken.Type = TokenType.LocalStringAccess;
if (currentToken.Type == TokenType.GlobalFlagAccessEnum)
currentToken.Type = TokenType.GlobalFlagAccess;
// Global or local?
var destScope = VariableScope.Global;
if (currentToken.Type == TokenType.LocalStringAccess)
destScope = VariableScope.Local;
currentToken = tokens[++index];
if (currentToken.Type != TokenType.Assignment)
throw new GossipScriptException("Unexpected Token following string access", currentToken);
Token op = currentToken;
currentToken = tokens[++index];
if (currentToken.Type == TokenType.StringLiteral)
{
string stringValue = currentToken.Value.Substring(1, currentToken.Value.Length - 2);
currentParent.Next = new AssignStringLiteral(destIndex, destScope, stringValue);
currentParent = currentParent.Next;
return index;
}
// If none of the above it must be an expression
Expression expression;
int skipTokens = ParseExpression(index, tokens, compilationContext, out expression);
index += skipTokens;
currentToken = tokens[index];
currentParent.Next = new AssignString(destIndex, destScope, expression);
currentParent = currentParent.Next;
return index;
}
