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dlg(1)					PCCTS Manual Pages				   dlg(1)

       dlg - DFA Lexical Analyzer Generator

       dlg [options] lexical_spec [output_file]

       dlg  is	a  tool  that produces fast deterministic finite automata for recognizing regular
       expressions in input.

       -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 charac-
	      ters into the same character classes.  It is suggested  that  level  -C2	is  used,
	      since  it  will  significantly reduce the size of the dfa produced for lexical ana-

       -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 produced.  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  clo-
	      sure at the end is guaranteed to require another character of look ahead.

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

       -ci    The  automaton  will  treat  upper  and lower case characters identically.  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  keep-
	      ing the source directory clear of ANTLR and DLG spawn.

	      Warns  if more than one regular expression could match the same character sequence.
	      The warnings give the numbers of the expressions 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  stan-
	      dard out.

       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 individual or company may do whatever they wish with source
       code distributed with PCCTS or the code generated by PCCTS, including the incorporation 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 (com-
       mercial product, 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.

       mode.h , dlgauto.h , dlgdef.h

       antlr(1), pccts(1)

DLG					    April 1994					   dlg(1)
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