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 recognizing 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 character classes.	It is suggested that level -C2 is used, since it will sig-
	      nificantly reduce the size of the dfa produced for lexical 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 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 closure 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 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 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 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  Com-
       piler  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 (commercial 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.

FILES

       mode.h , dlgauto.h , dlgdef.h

SEE ALSO

       antlr(1), pccts(1)

BUGS

DLG
								    April 1994								    dlg(1)