YYEXTRACT(1) BSD General Commands Manual YYEXTRACT(1)NAME
yyextract -- extract grammar rules from a yacc grammar
SYNOPSIS
yyextract [-behyV] [-o file] [-t title] [-w cols] [file ...]
DESCRIPTION
The yyextract utility extracts the grammar rules from a yacc grammar.
The options are as follows:
-b Select the Backus-Naur Form (BNF) for the output.
-e Select the Extended Backus-Naur Form (EBNF) for the output.
-h Output in HTML format.
-o file
Set the output destination to file.
-t title
Specify the page title for the generated HTML page.
-w cols
Set the width limit of the output (this sets only the width of the %token header).
-y Select the yacc format for the output. This is the default format.
-V Print version information on standard output then exit.
NOTES
The Extended Backus-Naur Form (EBNF) is like the Backus-Naur Form (BNF) but with the empty rules translated with the zero-or-one operator
(within the brackets '[' and ']').
AUTHORS
Sandro Sigala <sandro@sigala.it>
BSD July 15, 2001 BSD
Check Out this Related Man Page
YACC(1) General Commands Manual YACC(1)NAME
yacc - yet another compiler-compiler
SYNOPSIS
yacc [ -vd ] grammar
DESCRIPTION
Yacc converts a context-free grammar into a set of tables for a simple automaton which executes an LR(1) parsing algorithm. The grammar
may be ambiguous; specified precedence rules are used to break ambiguities.
The output file, y.tab.c, must be compiled by the C compiler to produce a program yyparse. This program must be loaded with the lexical
analyzer program, yylex, as well as main and yyerror, an error handling routine. These routines must be supplied by the user; Lex(1) is
useful for creating lexical analyzers usable by yacc.
If the -v flag is given, the file y.output is prepared, which contains a description of the parsing tables and a report on conflicts gener-
ated by ambiguities in the grammar.
If the -d flag is used, the file y.tab.h is generated with the define statements that associate the yacc-assigned `token codes' with the
user-declared `token names'. This allows source files other than y.tab.c to access the token codes.
FILES
y.output
y.tab.c
y.tab.h defines for token names
yacc.tmp, yacc.acts temporary files
/usr/share/misc/yaccparparser prototype for C programs
SEE ALSO lex(1)
LR Parsing by A. V. Aho and S. C. Johnson, Computing Surveys, June, 1974.
YACC - Yet Another Compiler Compiler by S. C. Johnson.
DIAGNOSTICS
The number of reduce-reduce and shift-reduce conflicts is reported on the standard output; a more detailed report is found in the y.output
file. Similarly, if some rules are not reachable from the start symbol, this is also reported.
BUGS
Because file names are fixed, at most one yacc process can be active in a given directory at a time.
7th Edition October 22, 1996 YACC(1)
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