/// <summary>
/// Main function that iterates over the token list.
/// </summary>
/// <param name="lambda">Generic lambda function that will be executed whenever an EOL is reached in the script file.</param>
public void Interpret(ProcessLineDelegate lambda)
{
Token current = head;
Text.StringBuilder accum = new System.Text.StringBuilder();
while (current != null)
{
switch (current.kind)
{
case 1:
accum.Append(current.val);
break;
case 2:
//In this case, variable is not an argument, thus just replace it with its value;
{
string s; _VARS.TryGetValue(current.val, out s);
accum.Append(s);
}
break;
case 3:
accum.Append(ParseFunction(ref current).val);
break;
}
if (cline < current.line || current.kind == 7)
{
//Send string
if (accum.ToString().Trim() != string.Empty)
{
try
{
if (lambda != null)
{
lambda(accum.ToString(), this);
}
accum = new System.Text.StringBuilder();
}
catch (Exception ex)
{
throw ex;
}
}
cline = current.line;
}
if (current.next != null)
{
current = current.next;
}
else
{
break;
}
}
}
void Scan(IO.TextReader input)
{
while (input.Peek() != -1)
{
char ch = (char)input.Peek();
if (ch == '%')
{
//eat '%'
input.Read();
Text.StringBuilder accum = new Text.StringBuilder();
ch = (char)input.Peek();
while (ch != '%')
{
accum.Append((char)input.Read());
if (input.Peek() == -1)
{
break;
}
ch = (char)input.Peek();
}
input.Read(); //eat '%'
AppendToken(accum.ToString(), line, 2);
}
else if (ch == ',')
{
input.Read();
}
else if (ch == '$')
{
//omg a function
Text.StringBuilder accum = new Text.StringBuilder();
input.Read();
ch = (char)input.Peek();
while (char.IsLetterOrDigit(ch) || ch == '_')
{
accum.Append(ch);
input.Read();
if (input.Peek() == -1)
{
break;
}
ch = (char)input.Peek();
}
if (ch != '(')
{
throw new Exception("Invalid character in function name");
}
AppendToken(accum.ToString(), line, 3);
}
else if (ch == '(')
{
input.Read();
AppendToken("", line, 4);
}
else if (ch == ')')
{
input.Read();
AppendToken("", line, 8);
}
else if (ch == '\r')
{
input.Read(); //eat CR
char c = (char)input.Peek();
if (c == '\n')
{
input.Read(); //eat LF
AppendToken("", line, 7);
}
else
{
line++;
}
}
else if (ch == '#')
{
input.Read();
AppendToken("", line, 9);
}
else
{
Text.StringBuilder accum = new System.Text.StringBuilder();
while (ch != '$' & ch != '%' & ch != '\r' & ch != ')')
{
if (ch == '\\')
{
//skip escape char and insert next one immediately
input.Read();
}
accum.Append((char)input.Read());
if (input.Peek() == -1)
{
break;
}
else if (input.Peek() == ',')
{
input.Read();
break;
}
ch = (char)input.Peek();
}
AppendToken(accum.ToString(), line, 1);
}
}
}