Fennel: CalcLexer Class Reference (original) (raw)

CalcLexer is the scanner class used by the assembler to tokenize a calculator program. More...

#include <[CalcLexer.h](CalcLexer%5F8h-source.html)>

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

CalcLexer is the scanner class used by the assembler to tokenize a calculator program.

The class is automatically generated by flex from CalcLexer.lpp.

Definition at line 89 of file CalcLexer.h.

Constructor & Destructor Documentation

| CalcLexer::CalcLexer | ( | | ) | [inline, explicit] | | -------------------- | - | | - | -------------------- |

Member Function Documentation

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.

| int CalcLexer::getColumn | ( | | ) | const [inline] | | ------------------------ | - | | - | ---------------- |

Returns the column number of the next token.

Definition at line 104 of file CalcLexer.h.

void CalcLexer::LexerError ( const char * msg )

| 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.

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 }

Member Data Documentation

The sematic value of the current token.

Definition at line 129 of file CalcLexer.h.

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

Generated on Mon Jun 22 04:00:28 2009 for Fennel by doxygen 1.5.1