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// hdr/includes
#ifndef ParserBase_h_included
#define ParserBase_h_included
#include <exception>
#include <vector>
#include <iostream>
// $insert preincludes
#include "../tokens/tokens.h"
// hdr/baseclass
namespace // anonymous
{
struct PI_;
}
// $insert parserbase
class ParserBase: public Tokens
{
public:
enum DebugMode_
{
OFF = 0,
ON = 1 << 0,
ACTIONCASES = 1 << 1
};
// $insert tokens
// $insert STYPE
using STYPE_ = int;
private:
// state semval
using StatePair = std::pair<size_t, STYPE_>;
// token semval
using TokenPair = std::pair<int, STYPE_>;
int d_stackIdx = -1;
std::vector<StatePair> d_stateStack;
StatePair *d_vsp = 0; // points to the topmost value stack
size_t d_state = 0;
TokenPair d_next;
int d_token;
bool d_terminalToken = false;
bool d_recovery = false;
protected:
enum Return_
{
PARSE_ACCEPT_ = 0, // values used as parse()'s return values
PARSE_ABORT_ = 1
};
enum ErrorRecovery_
{
UNEXPECTED_TOKEN_,
};
bool d_actionCases_ = false; // set by options/directives
bool d_debug_ = true;
size_t d_requiredTokens_;
size_t d_nErrors_; // initialized by clearin()
size_t d_acceptedTokens_;
STYPE_ d_val_;
ParserBase();
void ABORT() const;
void ACCEPT() const;
void ERROR() const;
STYPE_ &vs_(int idx); // value stack element idx
int lookup_() const;
int savedToken_() const;
int token_() const;
size_t stackSize_() const;
size_t state_() const;
size_t top_() const;
void clearin_();
void errorVerbose_();
void lex_(int token);
void popToken_();
void pop_(size_t count = 1);
void pushToken_(int token);
void push_(size_t nextState);
void redoToken_();
bool recovery_() const;
void reduce_(int rule);
void shift_(int state);
void startRecovery_();
public:
void setDebug(bool mode);
void setDebug(DebugMode_ mode);
};
// hdr/abort
inline void ParserBase::ABORT() const
{
throw PARSE_ABORT_;
}
// hdr/accept
inline void ParserBase::ACCEPT() const
{
throw PARSE_ACCEPT_;
}
// hdr/error
inline void ParserBase::ERROR() const
{
throw UNEXPECTED_TOKEN_;
}
// hdr/savedtoken
inline int ParserBase::savedToken_() const
{
return d_next.first;
}
// hdr/opbitand
inline ParserBase::DebugMode_ operator&(ParserBase::DebugMode_ lhs,
ParserBase::DebugMode_ rhs)
{
return static_cast<ParserBase::DebugMode_>(
static_cast<int>(lhs) & rhs);
}
// hdr/opbitor
inline ParserBase::DebugMode_ operator|(ParserBase::DebugMode_ lhs,
ParserBase::DebugMode_ rhs)
{
return static_cast<ParserBase::DebugMode_>(static_cast<int>(lhs) | rhs);
};
// hdr/recovery
inline bool ParserBase::recovery_() const
{
return d_recovery;
}
// hdr/stacksize
inline size_t ParserBase::stackSize_() const
{
return d_stackIdx + 1;
}
// hdr/state
inline size_t ParserBase::state_() const
{
return d_state;
}
// hdr/token
inline int ParserBase::token_() const
{
return d_token;
}
// hdr/vs
inline ParserBase::STYPE_ &ParserBase::vs_(int idx)
{
return (d_vsp + idx)->second;
}
#endif
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