YACC(1) YACC(1)
NAME
yacc, eyacc - yet another compiler-compiler
SYNOPSIS
yacc [ option ... ] grammar
eyacc [ -v ] [ grammar ]
DESCRIPTION
Yacc converts a context-free grammar and translation code
into a set of tables for an LR(1) parser and translator.
The grammar may be ambiguous; specified precedence rules are
used to break ambiguities.
The output file, must be compiled by the C compiler to pro-
duce a program `yyparse'. This program must be loaded with
a lexical analyzer function, yylex() (often generated by
lex(1)), with a main() program, and with an error handling
routine, yyerror(). Simple default versions of the last two
are loaded by option -ly of ld(1).
The options are
-o output
Direct output to the specified file instead of
-D Create file containing diagnostic messages. To incor-
porate them in the parser, compile it with preprocessor
symbol YYDEBUG defined. The amount of diagnostic out-
put from the parser is regulated by values of an exter-
nal variable `yydebug':
0 Report errors.
1 Also report reductions.
2 Also report the name of each token returned by
`yylex'.
-v Create file containing a description of the parsing
tables and of conflicts arising from ambiguities in the
grammar.
-d Create file containing #define statements that associ-
ate yacc-assigned `token codes' with user-declared
`token names'. Include it in source files other than
to give access to the token codes.
-s stem
Change the prefix `y' of the file names and to stem.
YACC(1) YACC(1)
Eyacc is a special version of yacc, with systematic error
recovery. It is used to compile pascal(A).
FILES
.rm]B