DFA Emulator

lexeme_beginning : pointer to the beginning of the next lexeme

forward: pointer to the current char

state: current state

nextchar(): move forward to the next char

transition(s,c): lookup the transition table

TOKEN nextToken(){

while (1){

switch (state)

case S0: c = nextchar(); state = transition(state,c); ...; break;

....

case Sn: ...

}