Fennel: CalcLexer Class Reference

List of all members.


Public Member Functions
	CalcLexer ()
	Constructs a new Calculator Lexer object.
int	yylex ()
	The lexical analzyer function.
int	getPosition () const
	Returns the character position of the next token.
int	getColumn () const
	Returns the column number of the next token.
CalcYYLocType &	getLocation ()
	Returns the location of the current token.
CalcTokenValue &	getValue ()
	Returns the semantic value of the current token.
void	LexerError (const char *msg)
	Reports a fatal error message by throwing a CalcAssemblerException.
Protected Member Functions
void	updateLocation ()
	Updates the location of the current token.
int	hex (char ch)
string	hex2string (const char *buf, uint buflen)
Protected Attributes
int	yycolno
	The column number of the next token.
int	yylineno
	The line number of the next token.
int	yypos
	The character position (starting from 0) of the next token.
CalcTokenValue	yylval
	The sematic value of the current token.
CalcYYLocType	yyloc
	The location of the current token.

Detailed Description

Constructor & Destructor Documentation

CalcLexer::CalcLexer ( ) [inline, explicit]

Constructs a new Calculator Lexer object.

Definition at line 95 of file CalcLexer.h.

00095 : CalcYYFlexLexer(), yycolno(1), yylineno(1), yypos(0) {}

Member Function Documentation

int CalcLexer::yylex ( )

The lexical analzyer function.

It scans the input stream, consuming tokens, until a rule's action returns a value

Referenced by CalcYYlex().

int CalcLexer::getPosition ( ) const [inline]

Returns the character position of the next token.

Definition at line 102 of file CalcLexer.h.

00102 { return yypos;   }

int CalcLexer::getColumn ( ) const [inline]

Returns the column number of the next token.

Definition at line 104 of file CalcLexer.h.

00104 { return yycolno; }

CalcYYLocType& CalcLexer::getLocation ( ) [inline]

Returns the location of the current token.

Definition at line 106 of file CalcLexer.h.

Referenced by CalcAssembler::assemble(), CalcAssembler::bindLiteralDone(), CalcYYlex(), CalcAssembler::getRegister(), hex(), hex2string(), and LexerError().

00106 { return yyloc;   }

CalcTokenValue& CalcLexer::getValue ( ) [inline]

Returns the semantic value of the current token.

Definition at line 108 of file CalcLexer.h.

Referenced by CalcYYlex().

00108 { return yylval;  }

void CalcLexer::LexerError ( const char * msg )

Reports a fatal error message by throwing a CalcAssemblerException.

Definition at line 4558 of file CalcLexer.cpp.

References getLocation().

04559 {
04560     throw CalcAssemblerException(msg, getLocation());
04561 }

void CalcLexer::updateLocation ( ) [protected]

Updates the location of the current token.

The location of the current token is calculated prior to every matched rule's action as part of the YY_USER_ACTION macro.

Definition at line 4543 of file CalcLexer.cpp.

References CalcYYLocType::first_column, CalcYYLocType::first_line, CalcYYLocType::first_pos, CalcYYLocType::last_column, CalcYYLocType::last_line, CalcYYLocType::last_pos, yycolno, yyleng, yylineno, yyloc, and yypos.

04544 {
04545     /*
04546      * This function does not handle tokens that span multiple lines.
04547      */
04548     yyloc.first_line   = yylineno;
04549     yyloc.first_column = yycolno;
04550     yyloc.first_pos    = yypos;
04551     yycolno += yyleng;
04552     yypos += yyleng;
04553     yyloc.last_line   = yylineno;
04554     yyloc.last_column = yycolno-1;
04555     yyloc.last_pos    = yypos-1;
04556 }

int CalcLexer::hex ( char ch ) [protected]

Definition at line 4563 of file CalcLexer.cpp.

References getLocation().

Referenced by hex2string().

04564 {
04565   if ((ch >= 'a') && (ch <= 'f')) return (ch-'a'+10);
04566   else if ((ch >= '0') && (ch <= '9')) return (ch-'0');
04567   else if ((ch >= 'A') && (ch <= 'F')) return (ch-'A'+10);
04568   else throw CalcAssemblerException("Invalid hex character", getLocation());
04569 }

string CalcLexer::hex2string	(	const char *	buf,
		uint	buflen
	)			`[protected]`

Definition at line 4572 of file CalcLexer.cpp.

References count(), getLocation(), and hex().

04573 {
04574     int i, count;
04575     unsigned char ch;
04576 
04577     assert(buf != NULL);
04578     if ((buflen % 2) != 0) {
04579         throw CalcAssemblerException("Invalid hex encoded string", getLocation());
04580     }
04581 
04582     count = buflen/2;
04583 
04584     string str(count, 0);
04585 
04586     for (i=0; i<count; i++) {
04587         ch = hex(*buf++) << 4;
04588         ch = ch + hex(*buf++);
04589         str[i] = ch;
04590     }
04591     return str;
04592 }