protected void ParseCode(Body parent, StringBuilder code)
{
try
{
code = new StringBuilder(code.ToString().Trim());
UnwrapCurlys(code);
while (code.Length > 0)
{
if (StartsWithIf(code))
{
StringBuilder condition = GetCondition(code);
StringBuilder body = GetBody(code);
IfStatement ifs = new IfStatement();
ifs.Condition = BuildExprTree(condition);
ParseCode(ifs.Body, body);
parent.Append(ifs);
}
else if (StartsWithElseIf(code))
{
IfStatement ifs = new IfStatement();
StringBuilder condition = GetCondition(code);
StringBuilder body = GetBody(code);
ifs.Condition = BuildExprTree(condition);
ParseCode(ifs.Body, body);
parent.AppendElseIf(ifs);
}
else if (StartsWithElse(code))
{
Body elseBody = new Body();
StringBuilder body = GetBody(code);
ParseCode(elseBody, body);
parent.AppendElse(elseBody);
}
else if (StartsWithWhile(code))
{
StringBuilder condition = GetCondition(code);
StringBuilder body = GetBody(code);
WhileLoop lp = new WhileLoop();
lp.Condition = BuildExprTree(condition);
ParseCode(lp.Body, body);
parent.Append(lp);
}
else
{ //must be a statement
StringBuilder statement = ReadToSemicolon(code);
//preprocess statements like +=
int operIndex = 0;
if (IsMathAssignment(statement.ToString(), ref operIndex))
{
string rewrite = ReWriteMathAssignment(statement.ToString(), operIndex);
statement.Clear();
statement.Insert(0, rewrite);
}
else if (IsIncrementOrDecrement(statement.ToString(), ref operIndex))
{
string rewrite = ReWriteIncrementDecrement(statement.ToString(), operIndex);
statement.Clear();
statement.Insert(0, rewrite);
}
if (IsPropOrAttrAssignment(statement))
{
string attrName = ExtractAttrName(statement);
if (IsAttr(attrName))
{
parent.Append(CreateAttrAssignment(statement));
}
else if (IsProp(attrName))
{
parent.Append(CreatePropAssignment(statement));
}
else
{
throw new Exception(attrName + " is not a property or attribute (parsing: " + statement + ")");
}
}
else if (statement.ToString().StartsWith("println"))
{
parent.Append(new PrintLn(statement));
}
else if (statement.ToString().StartsWith("newline"))
{
parent.Append(new NewLn());
}
else if (statement.ToString().StartsWith("printvar"))
{
string inner = ReadToParen(statement);
StringBuilder sb = GetCondition(new StringBuilder(inner));
parent.Append(new PrintVar(sb));
}
else if (statement.ToString().StartsWith("print_name") ||
statement.ToString().StartsWith("printname") ||
statement.ToString().StartsWith("printobjname")
)
{
string inner = ReadToParen(statement);
StringBuilder sb = GetCondition(new StringBuilder(inner));
parent.Append(new PrintObjectName(ToIIntResult(sb.ToString())));
}
else if (IsVarAssignment(statement))
{
parent.Append(CreateVarAssignment(statement));
}
else if (statement.ToString().StartsWith("look"))
{
parent.Append(new Look());
}
else if (statement.ToString().StartsWith("move"))
{
parent.Append(new Move());
}
else if (statement.ToString().StartsWith("ask"))
{
parent.Append(new Ask());
}
else if (statement.ToString().StartsWith("print"))
{ //do after all other prints
parent.Append(new Print(statement.ToString()));
}
else if (statement.ToString().StartsWith("call "))
{
throw new Exception("Don't use 'call'. Use C calling syntax instead.");
}
else if (StartsWithFunctionName(statement))
{
Call c = new Call("call " + GetFunctionName(statement));
parent.Append(c);
}
else if (statement.ToString().StartsWith("//"))
{
//do nothing, just throw the comment away
}
else
{
throw new Exception("Couldn't figure out what to do with: " + statement);
}
}
}
}
catch (Exception ex)
{
throw new Exception("Error parsing code near " + code.ToString(), ex);
}
}
public void Visit(WhileLoop wh)
{
throw new Exception("Visit 6809 while loop not implemented.");
}
