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80 lines
3.4 KiB
Groff
Executable File
80 lines
3.4 KiB
Groff
Executable File
.TH dlg 1 "April 1994" "DLG" "PCCTS Manual Pages"
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.SH NAME
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dlg \- DFA Lexical Analyzer Generator
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.SH SYNTAX
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.LP
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\fBdlg\fR [\fIoptions\fR] \fIlexical_spec\fR [\fIoutput_file\fR]
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.SH DESCRIPTION
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.B dlg
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is a tool that produces fast deterministic finite automata for recognizing
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regular expressions in input.
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.SH OPTIONS
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.IP "\fB-CC\fR"
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Generate C++ output. The \fIoutput_file\fP is not specified in this
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case.
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.IP "\fB-C\fR[\fP level\fR]
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Where \fPlevel\fR is the compression level used. 0 indications no
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compression, 1 removes all unused characters from the transition from table,
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and 2 maps equivalent characters into the same character classes. It is
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suggested that level -C2 is used, since it will significantly reduce the size
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of the dfa produced for lexical analyzer.
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.IP "\fB-m\fP
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Produces the header file for the lexical mode with a name other than
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the default name of "mode.h".
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.IP \fB-i\fP
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An interactive, or as interactive as possible, parser is produced. A character
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is only obtained when required to decide which state to go to. Some care
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must be taken to obtain accept states that do not require look ahead at the
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next character to determine if that is the stop state. Any regular expression
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with a Kleene closure at the end is guaranteed to require another character
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of look ahead.
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.IP "\fB-cl\fP class
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Specify a class name for DLG to generate. The default is DLGLexer.
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'class' will be a subclass of DLGLexerBase; only used for -CC.
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.IP \fB-ci\fP
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The automaton will treat upper and lower case characters identically.
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This is accomplished in the automaton; the characters in the lexical
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buffer are unmodified.
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.IP \fB-cs\fP
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Upper and lower case characters are treated as distinct. This is the
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default.
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.IP "\fB-o\fP dir
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Directory where output files should go (default="."). This is very
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nice for keeping the source directory clear of ANTLR and DLG spawn.
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.IP \fB-Wambiguity\fP
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Warns if more than one regular expression could match the same character
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sequence. The warnings give the numbers of the expressions in the dlg
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lexical specification file. The numbering of the expressions starts at one.
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Multiple warnings may be print for the same expressions.
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.IP \-
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Used in place of file names to get input from standard in or send output
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to standard out.
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.SH "SPECIAL CONSIDERATIONS"
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.PP
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\fIDlg\fP works... we think. There is no implicit guarantee of
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anything. We reserve no \fBlegal\fP rights to the software known as
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the Purdue Compiler Construction Tool Set (PCCTS) \(em PCCTS is in the
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public domain. An individual or company may do whatever they wish
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with source code distributed with PCCTS or the code generated by
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PCCTS, including the incorporation of PCCTS, or its output, into
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commercial software. We encourage users to develop software with
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PCCTS. However, we do ask that credit is given to us for developing
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PCCTS. By "credit", we mean that if you incorporate our source code
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into one of your programs (commercial product, research project, or
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otherwise) that you acknowledge this fact somewhere in the
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documentation, research report, etc... If you like PCCTS and have
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developed a nice tool with the output, please mention that you
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developed it using PCCTS. As long as these guidelines are followed, we
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expect to continue enhancing this system and expect to make other
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tools available as they are completed.
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.SH FILES
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.B mode.h
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,
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.B dlgauto.h
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,
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.B dlgdef.h
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.SH SEE ALSO
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.BR antlr (1),
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.BR pccts (1)
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.SH BUGS
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