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dlg(1)			      PCCTS Manual Pages			dlg(1)

NAME
       dlg - DFA Lexical Analyzer Generator

SYNTAX
       dlg [options] lexical_spec [output_file]

DESCRIPTION
       dlg is a	tool that produces fast	deterministic finite automata for rec-
       ognizing	regular	expressions in input.

OPTIONS
       -CC    Generate C++ output.  The	output_file is not specified  in  this
	      case.

       -C[ level]
	      Where  level  is	the  compression level used.  0	indications no
	      compression, 1 removes all unused	characters from	the transition
	      from table, and 2	maps equivalent	characters into	the same char-
	      acter classes.  It is suggested that level -C2 is	used, since it
	      will significantly reduce	the size of the	dfa produced for lexi-
	      cal analyzer.

       -m     Produces the header file for the lexical mode with a name	 other
	      than the default name of "mode.h".

       -i     An  interactive,	or  as interactive as possible,	parser is pro-
	      duced.  A	character is only obtained  when  required  to	decide
	      which  state to go to.  Some care	must be	taken to obtain	accept
	      states that do not require look ahead at the next	 character  to
	      determine	 if  that  is  the stop	state.	Any regular expression
	      with a Kleene closure at the end is guaranteed  to  require  an-
	      other character of look ahead.

       -cl class
	      Specify  a  class	 name for DLG to generate.  The	default	is DL-
	      GLexer.

       -ci    The automaton will treat upper and lower case characters identi-
	      cally.  This is accomplished in the automaton; the characters in
	      the lexical buffer are unmodified.

       -cs    Upper and	lower case characters are treated as  distinct.	  This
	      is the default.

       -o dir Directory	 where	output files should go (default=".").  This is
	      very nice	for keeping the	source directory clear	of  ANTLR  and
	      DLG spawn.

       -Wambiguity
	      Warns  if	 more than one regular expression could	match the same
	      character	sequence.  The warnings	give the numbers  of  the  ex-
	      pressions	 in the	dlg lexical specification file.	 The numbering
	      of the expressions starts	at  one.   Multiple  warnings  may  be
	      print for	the same expressions.

       -      Used  in	place  of  file	names to get input from	standard in or
	      send output to standard out.

SPECIAL	CONSIDERATIONS
       Dlg works...  we	think.	There is no implicit  guarantee	 of  anything.
       We reserve no legal rights to the software known	as the Purdue Compiler
       Construction Tool Set (PCCTS) --	PCCTS is in the	public domain.	An in-
       dividual	or company may do whatever they	wish with source code distrib-
       uted with PCCTS or the code generated by	PCCTS, including the  incorpo-
       ration of PCCTS,	or its output, into commercial software.  We encourage
       users to	develop	software with PCCTS.  However, we do ask  that	credit
       is  given to us for developing PCCTS.  By "credit", we mean that	if you
       incorporate our source code into	one of your programs (commercial prod-
       uct,  research  project,	 or  otherwise)	that you acknowledge this fact
       somewhere in the	documentation, research	report,	etc...	 If  you  like
       PCCTS  and  have	 developed a nice tool with the	output,	please mention
       that you	developed it using PCCTS.  As long  as	these  guidelines  are
       followed,  we  expect  to  continue enhancing this system and expect to
       make other tools	available as they are completed.

FILES
       mode.h ,	dlgauto.h , dlgdef.h

SEE ALSO
       antlr(1), pccts(1)

BUGS
DLG				  April	1994				dlg(1)

NAME | SYNTAX | DESCRIPTION | OPTIONS | SPECIAL CONSIDERATIONS | FILES | SEE ALSO | BUGS

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