Scanner Class Reference

#include <scanner.h>

Public Member Functions
	Scanner (std::istream *)
	Initialise scanner with a stream. More...
void	source (std::istream *)
	Set new input stream. More...
std::istream *	GetSource (void)
	Return input stream. More...
bool	operator() (Token &)
	Scan input until the next Token. More...
void	print_error (const char *)
	Issue an error message. More...
unsigned long	get_line () const
	Return current line number in input stream. More...
unsigned long	get_col () const
	Return position in current line in input stream. More...
void	clear_context ()

Public Attributes
SymbolDatum	BeginArraySymbol
SymbolDatum	EndArraySymbol
SymbolDatum	BeginProcedureSymbol
SymbolDatum	EndProcedureSymbol
SymbolDatum	EndSymbol

Private Types
enum	ScanStates {   start =0, intdgtst, intexpst, nullst,   aheadintst, decpfirstst, decpdgtst, decpointst,   fracdgtst, minusst, plusst, aheadsgst,   sgalphast, aheadfracst, expntlst, plexpst,   mnexpst, openbracketst, closebracketst, openbracest,   closebracest, openparst, closeparst, expdigst,   dotalphast, alphast, aheadalphst, slashst,   literalst, aheadlitst, percentst, whitest,   asteriskst, ccommentst, startstringst, stringst,   backslashst, newlinest, tabulatorst, backslashcst,   oparenthcst, cparenthcst, end, eofst,   error, lastscanstate }
enum	Codes {   invalid =0, whitespace, eof, digit,   null, expntl, decpoint, plus,   minus, openbracket, closebracket, openbrace,   closebrace, openparenth, closeparenth, alpha,   slash, backslash, newline, tabulator,   asterisk, percent, eoln, other,   lastcode }

Private Member Functions
int	digval (unsigned char c) const

Private Attributes
std::istream *	in
CharCode	code
unsigned long	line
	Current line number. More...
unsigned long	col
	Current column in line. More...
std::string	context
	Current context. More...
std::string	old_context
enum ScanStates	trans [lastscanstate][lastcode]
const unsigned char	space
const unsigned char	tab
const unsigned char	endoln
const unsigned char	cr
const unsigned char	endof

Member Enumeration Documentation

enum Scanner::Codes

private

Enumerator
invalid
whitespace
eof
digit
null
expntl
decpoint
plus
minus
openbracket
closebracket
openbrace
closebrace
openparenth
closeparenth
alpha
slash
backslash
newline
tabulator
asterisk
percent
eoln
other
lastcode

enum Scanner::ScanStates

private

Enumerator
start
intdgtst
intexpst
nullst
aheadintst
decpfirstst
decpdgtst
decpointst
fracdgtst
minusst
plusst
aheadsgst
sgalphast
aheadfracst
expntlst
plexpst
mnexpst
openbracketst
closebracketst
openbracest
closebracest
openparst
closeparst
expdigst
dotalphast
alphast
aheadalphst
slashst
literalst
aheadlitst
percentst
whitest
asteriskst
ccommentst
startstringst
stringst
backslashst
newlinest
tabulatorst
backslashcst
oparenthcst
cparenthcst
end
eofst
error
lastscanstate

Constructor & Destructor Documentation

Scanner::Scanner

(

std::istream *

is

)

Initialise scanner with a stream.

Scanner (implemented as a DFA)

References aheadalphst, aheadfracst, aheadintst, aheadlitst, aheadsgst, alpha, alphast, asterisk, asteriskst, backslash, backslashcst, backslashst, nest::names::c, ccommentst, closebrace, closebracest, closebracket, closebracketst, closeparenth, closeparst, code, cparenthcst, cr, decpdgtst, decpfirstst, decpoint, decpointst, digit, dotalphast, endof, endoln, eof, eofst, eoln, error, expdigst, expntl, expntlst, fracdgtst, CharCode::Group(), intdgtst, intexpst, invalid, lastcode, lastscanstate, literalst, minus, minusst, mnexpst, newline, newlinest, null, nullst, oparenthcst, openbrace, openbracest, openbracket, openbracketst, openparenth, openparst, percent, percentst, plexpst, plus, plusst, CharCode::Range(), sgalphast, slash, slashst, space, start, startstringst, stringst, tab, tabulator, tabulatorst, trans, and whitespace.

Member Function Documentation

void Scanner::clear_context ( )

inline

References col, context, line, and old_context.

Referenced by Parser::clear_context().

int Scanner::digval ( unsigned char  c ) const

inlineprivate

Referenced by operator()().

unsigned long Scanner::get_col ( ) const

inline

Return position in current line in input stream.

References col.

unsigned long Scanner::get_line ( ) const

inline

Return current line number in input stream.

References line.

std::istream* Scanner::GetSource ( void  )

inline

Return input stream.

References in.

bool Scanner::operator()

(

Token &

t

)

Scan input until the next Token.

References aheadalphst, aheadfracst, aheadintst, aheadlitst, aheadsgst, alphast, assert(), backslashcst, BeginArraySymbol, BeginProcedureSymbol, nest::names::c, Token::clear(), closebracest, closebracketst, closeparst, code, col, context, cparenthcst, nest::names::d, decpdgtst, decpointst, digval(), dotalphast, numerics::e, end, EndArraySymbol, endof, endoln, EndProcedureSymbol, EndSymbol, eofst, error, expdigst, expntlst, fracdgtst, in, intdgtst, intexpst, line, literalst, minusst, mnexpst, Token::move(), newlinest, old_context, oparenthcst, openbracest, openbracketst, openparst, nest::names::p, plusst, print_error(), sgalphast, start, nest::names::state, stringst, tabulatorst, and trans.

void Scanner::print_error

(

const char *

msg

)

Issue an error message.

References col, context, line, and old_context.

Referenced by Parser::operator()(), and operator()().

void Scanner::source

(

std::istream *

in_s

)

Set new input stream.

References col, context, in, line, and old_context.

Referenced by Parser::readSymbol(), and Parser::readToken().

Member Data Documentation

SymbolDatum Scanner::BeginArraySymbol

Referenced by Parser::operator()(), and operator()().

SymbolDatum Scanner::BeginProcedureSymbol

Referenced by Parser::operator()(), and operator()().

CharCode Scanner::code

private

Referenced by operator()(), and Scanner().

unsigned long Scanner::col

private

Current column in line.

Referenced by clear_context(), get_col(), operator()(), print_error(), and source().

std::string Scanner::context

private

Current context.

Referenced by clear_context(), operator()(), print_error(), and source().

const unsigned char Scanner::cr

private

Referenced by Scanner().

SymbolDatum Scanner::EndArraySymbol

Referenced by Parser::operator()(), and operator()().

const unsigned char Scanner::endof

private

Referenced by operator()(), and Scanner().

const unsigned char Scanner::endoln

private

Referenced by operator()(), and Scanner().

SymbolDatum Scanner::EndProcedureSymbol

Referenced by Parser::operator()(), and operator()().

SymbolDatum Scanner::EndSymbol

Referenced by IparsestdinFunction::execute(), ParsestdinFunction::execute(), IparseFunction::execute(), Token_sFunction::execute(), Token_isFunction::execute(), Symbol_sFunction::execute(), Parser::operator()(), and operator()().

std::istream* Scanner::in

private

Referenced by GetSource(), operator()(), and source().

unsigned long Scanner::line

private

Current line number.

Referenced by clear_context(), get_line(), operator()(), print_error(), and source().

std::string Scanner::old_context

private

Referenced by clear_context(), operator()(), print_error(), and source().

const unsigned char Scanner::space

private

Referenced by Scanner().

const unsigned char Scanner::tab

private

Referenced by Scanner().

enum ScanStates Scanner::trans[lastscanstate][lastcode]

private

Referenced by operator()(), and Scanner().

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

• scanner.h
• scanner.cc