dlg1.txt
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- dlg(1) PCCTS Manual Pages dlg(1)
- NAME
- dlg - DFA Lexical Analyzer Generator
- SYNTAX
- dlg [_o_p_t_i_o_n_s] _l_e_x_i_c_a_l__s_p_e_c [_o_u_t_p_u_t__f_i_l_e]
- DESCRIPTION
- dlg is a tool that produces fast deterministic finite auto-
- mata for recognizing regular expressions in input.
- OPTIONS
- -CC Generate C++ output. The _o_u_t_p_u_t__f_i_l_e is not specified
- in this case.
- -C[ level]
- Where level is the compression level used. 0 indica-
- tions no compression, 1 removes all unused characters
- from the transition from table, and 2 maps equivalent
- characters into the same character classes. It is sug-
- gested that level -C2 is used, since it will signifi-
- cantly 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 charac-
- ters identically. This is accomplished in the automa-
- ton; the characters in the lexical buffer are unmodi-
- fied.
- -cs Upper and lower case characters are treated as dis-
- tinct. 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 specifi-
- cation 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
- _D_l_g 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 (commercial product, research pro-
- ject, 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