public static ForLoopEntry Make(int step, int lhs, int rhs, int increment)
{
ForLoopEntry entry = new ForLoopEntry();
entry.Step = step;
entry.LHS = lhs;
entry.RHS = rhs;
entry.Increment = increment;
return(entry);
}
//------------------------------------------------------------------------------------------------------------
private void forStatement(string[] tokens, int lineNumber)
{
// Place increment value into the symbol table
_symbolTable.AddConst(FOR_LOOP_INCREMENT);
if (findNext(out int intNextLineLocation)) // validate there is a 'next' statement
{
// validate that the 'for' statement following the correct syntax
// [2] = variable, [3] = comparator, [4] = var/const, [5] = 'to', [6] = var/const
string strLHS = tokens[2];
string strRHS = tokens[4];
string strCheck = tokens[6];
if (Toolbelt.IsValidVariable(strLHS) &&
tokens[3] == "=" &&
tokens[5] == "to")
{
putInSymbolTable(tokens);
// Format the assignment string so it can be properly processed
string assignment = $"00 let {strLHS} = {strRHS}";
letStatement(assignment.Split(' '), lineNumber);
// after let statement is process, the next entry will be the start of the commands in the loop
_forLoopEntries.Push(ForLoopEntry.Make(
step: _workingLineNumber,
lhs: _symbolTable.Find(strLHS).Location(),
rhs: _symbolTable.Find(strCheck).Location(),
increment: FOR_LOOP_INCREMENT
));
}
else
{
throw new SystemException($"Invalid 'for' statement -on code line {lineNumber}");
}
}
else
{
throw new SystemException($"'for' missing 'next' statment -on code line {lineNumber}");
}
}