dlg.1
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上传日期:2007-01-06
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- .TH dlg 1 "April 1994" "DLG" "PCCTS Manual Pages"
- .SH NAME
- dlg - DFA Lexical Analyzer Generator
- .SH SYNTAX
- .LP
- fBdlgfR [fIoptionsfR] fIlexical_specfR [fIoutput_filefR]
- .SH DESCRIPTION
- .B dlg
- is a tool that produces fast deterministic finite automata for recognizing
- regular expressions in input.
- .SH OPTIONS
- .IP "fB-CCfR"
- Generate C++ output. The fIoutput_filefP is not specified in this
- case.
- .IP "fB-CfR[fP levelfR]
- Where fPlevelfR 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 significantly reduce the size
- of the dfa produced for lexical analyzer.
- .IP "fB-mfP
- Produces the header file for the lexical mode with a name other than
- the default name of "mode.h".
- .IP fB-ifP
- 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.
- .IP "fB-clfP class
- Specify a class name for DLG to generate. The default is DLGLexer.
- 'class' will be a subclass of DLGLexerBase; only used for -CC.
- .IP fB-cifP
- The automaton will treat upper and lower case characters identically.
- This is accomplished in the automaton; the characters in the lexical
- buffer are unmodified.
- .IP fB-csfP
- Upper and lower case characters are treated as distinct. This is the
- default.
- .IP "fB-ofP dir
- Directory where output files should go (default="."). This is very
- nice for keeping the source directory clear of ANTLR and DLG spawn.
- .IP fB-WambiguityfP
- 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.
- .IP -
- Used in place of file names to get input from standard in or send output
- to standard out.
- .SH "SPECIAL CONSIDERATIONS"
- .PP
- fIDlgfP works... we think. There is no implicit guarantee of
- anything. We reserve no fBlegalfP rights to the software known as
- the Purdue Compiler Construction Tool Set (PCCTS) (em 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.
- .SH FILES
- .B mode.h
- ,
- .B dlgauto.h
- ,
- .B dlgdef.h
- .SH SEE ALSO
- .BR antlr (1),
- .BR pccts (1)
- .SH BUGS