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Redid lookahead in a much much saner way. Now should be a legitimate parser somewhere between LALR(1) and LR(1).

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This commit is contained in:
Nathan Braswell
2013-06-26 14:27:28 -04:00
parent ee9b8b8c39
commit 6a2977d12a
5 changed files with 78 additions and 109 deletions
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9
include/ParseRule.h
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@@ -14,9 +14,9 @@
class ParseRule {
public:
ParseRule();
ParseRule(Symbol* leftHandle, int pointerIndex, std::vector<Symbol*> &rightSide, Symbol* lookahead = NULL);
ParseRule(Symbol* leftHandle, int pointerIndex, std::vector<Symbol*> &rightSide, std::vector<Symbol*>* lookahead);
~ParseRule();
const bool equalsExceptLookahead(const ParseRule &other);
bool const operator==(const ParseRule &other);
bool const operator!=(const ParseRule &other);
@@ -35,13 +35,16 @@ class ParseRule {
bool advancePointer();
bool isAtEnd();
void setLookahead(std::vector<Symbol*>* lookahead);
std::vector<Symbol*>* getLookahead();
std::string toString();
std::string toDOT();
private:
int pointerIndex;
Symbol* leftHandle;
Symbol* lookahead;
std::vector<Symbol*>* lookahead;
std::vector<Symbol*> rightSide;
};

4
include/Parser.h
View File

@@ -25,9 +25,7 @@ class Parser {
void loadGrammer(std::string grammerInputString);
std::vector<Symbol*>* firstSet(Symbol* token);
void printFirstSets();
//std::vector<Symbol*>* followSet(int stateNum, Symbol* token);
std::vector<Symbol*>* gramFollowSet(State* state, Symbol* token);
std::vector<Symbol*>* gramFollowSetAvoid(State* state, Symbol* token, std::vector<Symbol*>* avoidList);
std::vector<Symbol*>* incrementiveFollowSet(ParseRule* rule);
void createStateSet();
void closure(State* state);
void addStates(std::vector< State* >* stateSets, State* state);