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The 640 MEG Shareware Studio 2
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The 640 Meg Shareware Studio CD-ROM Volume II (Data Express)(1993).ISO
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DLG1.TXT
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1992-12-08
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dlg - DFA Lexical Analyzer Generator
dlg [ -C [ level ] ] [ -m mode_file ] [ -i ] [ -cs or -ci ]
lexical_spec output_file
dlg is a tool that produces fast deterministic finite automata for
recognizing regular expressions in input.
-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 signi-
ficantly 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 char-
acter 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. -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.
- Used in place of file names to get input from standard in or send
output to standard out.
Dlg works... we think. There is no implicit guarantee of any-
thing. 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 commerical
software. We encourage users to develop software with PCCTS. How-
ever, 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 con-
tinue enhancing this system and expect to make other tools available
as they are completed.
mode.h , dlgauto.h , dlgdef.h
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