Lexer Class Reference

#include <interpret.h>

Inheritance diagram for Lexer:

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Public Member Functions
	Lexer (const string &aBuffer)
	~Lexer (void)
virtual const int	GetTopSymbol (void)
virtual const char	atSr (const int ati, const int atj)=0
virtual const int	EofId (void) const=0
virtual const int	IdentifierId (void) const=0
virtual const int	NumberId (void) const=0
const bool	IsReal (void) const
const string &	GetConstant (void) const
Data Fields
int	lineno
std::map< string, int, greater< string > >	symbol
Protected Member Functions
virtual const bool	isSeparator (void)
virtual const int	SkipComment (void)
virtual const int	LexNext (void)
virtual const int	GetIdentifier (void)
virtual const int	GetNumber (void)
Private Attributes
const string &	buffer
string::size_type	at
string::size_type	bufLen
string	constantStr
bool	realConstant

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Constructor & Destructor Documentation

Lexer::Lexer (  const string &  aBuffer  )

Definition at line 3 of file interpret.cpp. : buffer( aBuffer ) , bufLen( aBuffer.length() ) , at( 0 ) , lineno( 0 ) { }

Lexer::~Lexer (  void   )  [inline]

Definition at line 23 of file interpret.h. {};

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Member Function Documentation

virtual const char Lexer::atSr (  const int  ati, const int  atj )  [pure virtual]

Implemented in Ars::ExprInt, Expr, and Ars::ExprInt. Referenced by Interpret::Run().

virtual const int Lexer::EofId (  void   )  const [pure virtual]

Implemented in Ars::ExprInt, Expr, and Ars::ExprInt. Referenced by Interpret::Initialize(), and SkipComment().

const string& Lexer::GetConstant (  void   )  const [inline]

Definition at line 33 of file interpret.h. References constantStr. Referenced by Interpret::Run(), and Interpret::ShiftRule(). { return constantStr; }

const int Lexer::GetIdentifier (  void   )  [protected, virtual]

Definition at line 66 of file interpret.cpp. References at, buffer, constantStr, and IdentifierId(). Referenced by LexNext(). { while( isalnum( buffer[at] ) || buffer[at] == '_' ) constantStr += buffer[at++]; return IdentifierId(); }

const int Lexer::GetNumber (  void   )  [protected, virtual]

Definition at line 74 of file interpret.cpp. References at, buffer, constantStr, NumberId(), and realConstant. Referenced by LexNext(). { while( isdigit( buffer[at] ) ) constantStr += buffer[at++]; if( buffer[at] == '.' ) { at += 1; realConstant = true; constantStr += '.'; while( isdigit( buffer[at] ) ) constantStr += buffer[at++]; } return NumberId(); }

const int Lexer::GetTopSymbol (  void   )  [virtual]

Definition at line 8 of file interpret.cpp. References at, constantStr, isSeparator(), realConstant, and SkipComment(). Referenced by Interpret::Run(), and SkipComment(). { realConstant = false; constantStr.clear(); while( isSeparator() ) at++; return SkipComment(); }

virtual const int Lexer::IdentifierId (  void   )  const [pure virtual]

Implemented in Ars::ExprInt, Expr, and Ars::ExprInt. Referenced by GetIdentifier().

const bool Lexer::IsReal (  void   )  const [inline]

Definition at line 32 of file interpret.h. References realConstant. { return realConstant; }

const bool Lexer::isSeparator (  void   )  [protected, virtual]

Definition at line 19 of file interpret.cpp. References at, buffer, bufLen, and lineno. Referenced by GetTopSymbol(). { if( at < bufLen && buffer.substr( at , 1 ).find_first_of( "\n\r\t " ) != string::npos ) { if( buffer[at] == '\n' ) lineno += 1; return true; } return false; }

const int Lexer::LexNext (  void   )  [protected, virtual]

Definition at line 48 of file interpret.cpp. References at, buffer, constantStr, GetIdentifier(), GetNumber(), and symbol. Referenced by SkipComment(). { for( map<string,int,greater<string> >::iterator it = symbol.begin() ; it != symbol.end() ; ++it ) if( buffer.substr( at , it->first.length() ) == it->first ) { constantStr = it->first; at += it->first.length(); return it->second; } if( isalpha( buffer[at] ) ) return GetIdentifier(); else if( isdigit( buffer[at] ) ) return GetNumber(); return -1; }

virtual const int Lexer::NumberId (  void   )  const [pure virtual]

Implemented in Ars::ExprInt, Expr, and Ars::ExprInt. Referenced by GetNumber().

const int Lexer::SkipComment (  void   )  [protected, virtual]

Definition at line 30 of file interpret.cpp. References at, buffer, bufLen, EofId(), GetTopSymbol(), and LexNext(). Referenced by GetTopSymbol(). { if( at > bufLen ) return -1; else if( at == bufLen ) { at += 1; return EofId(); } else if( (at + 2) < bufLen && buffer.substr( at , 2 ) == "//" ) { at = buffer.find( '\n' , at ); return GetTopSymbol(); } return LexNext(); }

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Field Documentation

string::size_type Lexer::at [private]

Definition at line 10 of file interpret.h. Referenced by GetIdentifier(), GetNumber(), GetTopSymbol(), isSeparator(), LexNext(), and SkipComment().

const string& Lexer::buffer [private]

Definition at line 9 of file interpret.h. Referenced by GetIdentifier(), GetNumber(), isSeparator(), LexNext(), and SkipComment().

string::size_type Lexer::bufLen [private]

Definition at line 10 of file interpret.h. Referenced by isSeparator(), and SkipComment().

string Lexer::constantStr [private]

Definition at line 12 of file interpret.h. Referenced by GetConstant(), GetIdentifier(), GetNumber(), GetTopSymbol(), and LexNext().

int Lexer::lineno

Definition at line 17 of file interpret.h. Referenced by isSeparator().

bool Lexer::realConstant [private]

Definition at line 13 of file interpret.h. Referenced by GetNumber(), GetTopSymbol(), and IsReal().

std::map<string,int,greater<string> > Lexer::symbol

Definition at line 19 of file interpret.h. Referenced by Expr::Expr(), Ars::ExprInt::ExprInt(), and LexNext().

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The documentation for this class was generated from the following files:

• interpret.h
• interpret.cpp

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