Zack Buhman
e48bd182dc
This also concedes that a lexer that returns std::vector is probably the simplest API for the parser, but I will still continue to consider alternatives.
36 lines
535 B
C++
36 lines
535 B
C++
#include "lexer.hpp"
|
|
#include "token.hpp"
|
|
|
|
namespace dsp {
|
|
|
|
struct lexer_iterator_t
|
|
{
|
|
token_t previous_token;
|
|
token_t current_token;
|
|
lexer_t& lexer;
|
|
|
|
lexer_iterator_t(lexer_t& lexer)
|
|
: lexer(lexer), previous_token(lexer.scan_token()), current_token(previous_token)
|
|
{
|
|
}
|
|
|
|
token_t& advance()
|
|
{
|
|
previous_token = current_token;
|
|
current_token = lexer.scan_token();
|
|
return previous_token;
|
|
}
|
|
|
|
token_t& peek()
|
|
{
|
|
return current_token;
|
|
}
|
|
|
|
token_t& previous()
|
|
{
|
|
return previous_token;
|
|
}
|
|
};
|
|
|
|
}
|