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4 .\" This code is derived from software contributed to Berkeley by
5 .\" Robert Paul Corbett.
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35 .\" @(#)yacc.1 5.8 (Berkeley) 5/24/93
37 .\" $OpenBSD: yacc.1,v 1.14 2001/05/01 17:58:05 aaron Exp $
44 .Nd an LALR(1) parser generator
48 .Op Fl b Ar file_prefix
49 .Op Fl o Ar output_filename
50 .Op Fl p Ar symbol_prefix
55 utility reads the grammar specification in the file
57 and generates an LR(1) parser for it.
58 The parsers consist of a set of LALR(1) parsing tables and a driver routine
59 written in the C programming language.
62 utility normally writes the parse tables and the driver routine to the file
65 The following options are available:
66 .Bl -tag -width indent
67 .It Fl b Ar file_prefix
68 Change the prefix prepended to the output file names to
71 The default prefix is the character
80 option is not specified,
82 will insert #line directives in the generated code.
83 The #line directives let the C compiler relate errors in the
84 generated code to the user's original code.
89 will not insert the #line directives.
90 Any #line directives specified by the user will be retained.
91 .It Fl o Ar output_filename
94 to write the generated code to
96 instead of the default file,
98 .It Fl p Ar symbol_prefix
99 Change the prefix prepended to yacc-generated symbols to
100 the string denoted by
102 The default prefix is the string
107 to produce separate files for code and tables.
111 and the tables file is named
114 Change the preprocessor directives generated by
116 so that debugging statements will be incorporated in the compiled code.
118 Cause a human-readable description of the generated parser to
119 be written to the file
123 .Bl -tag -width ".Ev TMPDIR"
125 Name of directory where temporary files are to be created.
128 The names of the tables generated by this version of
131 .Va yylhs , yylen , yydefred , yydgoto , yysindex ,
132 .Va yyrindex , yygindex , yytable ,
135 Two additional tables,
141 is defined and non-zero.
143 .Bl -tag -width "Pa /tmp/yacc.aXXXXXXXXXX" -compact
148 .It Pa /tmp/yacc.aXXXXXXXXXX
149 .It Pa /tmp/yacc.tXXXXXXXXXX
150 .It Pa /tmp/yacc.uXXXXXXXXXX
153 If there are rules that are never reduced,
154 the number of such rules is reported on standard error.
158 the number of conflicts is reported on standard error.
169 command appeared in PWB UNIX.