diff options
Diffstat (limited to 'bnf/lex.hpp')
| -rw-r--r-- | bnf/lex.hpp | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/bnf/lex.hpp b/bnf/lex.hpp index b9865552..4c4c6576 100644 --- a/bnf/lex.hpp +++ b/bnf/lex.hpp @@ -10,18 +10,30 @@ struct ParserContext ::std::unique_ptr<Module> output_module; // semi-evil hack used to break '>>' apart into '>' '>' - int next_token; + ::std::vector<int> next_token; ParserContext(::std::string filename): filename(filename), output_module(), next_token(0) - {} - + { + //next_token.reserve(2); + } + + int popback() { + if( next_token.size() > 0 ) { + int rv = next_token.back(); + next_token.pop_back(); + return rv; + } + else { + return 0; + } + } void pushback(int tok) { - assert(next_token == 0); - next_token = tok; + assert(next_token.size() < 2); + next_token.push_back( tok ); } }; #include ".gen/rust.tab.hpp" |