private void generateAssignment(Node root)
{
Node assignOpNode = root.children[0];
Node idNode = assignOpNode.children[0];
Node valueNode = assignOpNode.children[1];
Tuple <int, int> scopeLocations = findScope(idNode.name);
int scopeIndex = scopeLocations.Item1;
int locationInScope = scopeLocations.Item2;
if (scopeIndex != -1 && locationInScope != -1)
{
ScopeElement idToModify = this.scopes[scopeIndex].scopeMembers[locationInScope];
Tuple <string, Object> exprValues = generateExpr(valueNode);
String exprType = exprValues.Item1.ToString();
if (exprType == idToModify.type)
{
idToModify.value = exprValues.Item2;
idToModify.isInitialized = true;
buildPrintMessage("id: " + idNode.name + " assigned " + exprValues.Item2.ToString() + ".");
}
else if (exprType != "error")
{
buildPrintMessage("~~~Error: id " + idNode.name + " of type " + idToModify.type + " is does not match the type of the expression: " + exprType + ".");
this.errorCount++;
}
}
else
{
buildPrintMessage("~~~Error: id " + idNode.name + " is not declared in its scope or any parent scope.");
this.errorCount++;
}
}
private Tuple <string, Object> getIdInfo(string id)
{
Tuple <int, int> idLocation = findScope(id);
ScopeElement idElement = this.scopes[idLocation.Item1].scopeMembers[idLocation.Item2];
return(new Tuple <string, Object>(idElement.type, idElement.value));
}
private Tuple <string, Object> generateExpr(Node root)
{
Tuple <string, Object> returnValues;
if (isDigit.IsMatch(root.name))
{
returnValues = new Tuple <string, Object>("int", Int32.Parse(root.name));
}
else if (root.name == "==" || root.name == "!=" || root.name == "false" || root.name == "true")
{
returnValues = generateBooleanExpr(root);
}
else if (isString.IsMatch(root.name))
{
returnValues = new Tuple <string, Object>("string", root.name);
}
else if (root.name == "+")
{
returnValues = generateIntExpr(root);
}
else if (isChar.IsMatch(root.name))
{
Tuple <int, int> scopeLocations = findScope(root.name);
int scopeIndex = scopeLocations.Item1;
int locationInScope = scopeLocations.Item2;
if (scopeIndex != -1 && locationInScope != -1)
{
ScopeElement idToUse = this.scopes[scopeIndex].scopeMembers[locationInScope];
idToUse.isUsed = true;
if (!idToUse.isInitialized)
{
buildPrintMessage("~~~Warning, id " + root.name + " is used without being initialized.");
}
returnValues = new Tuple <string, Object>(idToUse.type, idToUse.value);
}
else
{
buildPrintMessage("~~~Error: id " + root.name + " is not declared in its scope or any parent scope.");
this.errorCount++;
returnValues = new Tuple <string, Object>("error", "You've met with a terrible fate, haven't you?");
}
}
else
{
// Should be impossible to reach when this function is finished, but I felt having detailed
// if/else blocks was more desirable than letting whatever the end branch was going to else.
this.errorCount++;
returnValues = new Tuple <string, Object>("error", "You've met with a terrible fate, haven't you?");
}
return(returnValues);
}
public void addChildScope(ScopeElement childScope)
{
this.scopeMembers.Add(childScope);
}