BISON++
Section: COMMANDS (1)
Updated: 3/3/93
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NAME
bison++ - generate a parser in c or c++.
SYNOPSIS
bison++ [-dltvyVu] [-b file-prefix] [-p name-prefix] [-o outfile] [-h headerfile] [-S skeleton] [-H header-skeleton] [--debug] [--defines] [--fixed-output-files] [--no-lines] [--verbose] [--version] [--yacc] [--usage] [--help] [--file-prefix=prefix] [--name-prefix=prefix] [--skeleton=skeletonfile] [--headerskeleton=headerskeletonfile] [--output=outfile] [--header-name=header] grammar-file
DESCRIPTION
Generate a parser. Based on bison version 1.19. See bison(1) for details of main functionality. Only changes are reported here.
You now generate a C++ class if you are compiling with a C++ compiler. The generated header is far more rich than before, and is made from a skeleton-header. The code skeleton is also richer, and the generated code is less important compared to the skeletons. It permit you to modify much things only by changing the two skeletons.
In plain C, the bison++ is compatible with standard bison.
OPTIONS
- --name-prefix=prefix
-
- -p prefix
-
Set prefix of names of yylex,yyerror. keeped for compatibility, but you should prefer %define LEX newname, and similar.
- --skeleton=skeleton
-
- -S skeleton
-
Set filename of code skeleton. Default is bison.cc.
- --headerskeleton=header-skeleton
-
- -H header-skeleton
-
Set filename of header skeleton. Default is bison.h.
- --header-name=header
-
- -h header
-
Set filename of header skeleton. Default is y.tab.h, or prefix.h if option -b is used or c_basename.h if -o is used. .c, .cc, .C, .cpp, .cxx options for output files are replaced by .h for header name.
DECLARATIONS
These are new declarations to put in the declaration section :
- %name parser_name
-
Declare the name of this parser. User for C++ class name, and to render many names unique. default is parse. Must be given before %union and %define, or never.
- %define define_name \fIcontent\.\.\.\fP
-
Declare a macro symbol in header and code. The name of the symbol is YY_'parser_name'_'define_name'. The content if given after, as with #define. Newline can be escaped as with #define. Many symbols are proposed for customisation.
- %union
-
as with bison generate a union for semantic type. The difference is that the union is named yy_'parser_name'_stype.
- %pure_parser
-
As with bison in C. In C++ generate a parser where yylval, and yylloc (if needed) are passed as parameter to yylex, and where some instance variable are local to yyparse (like yydebug...). Not very useful, since you can create multiple instances for reentering another parser.
- %header{
-
Like %{, but include this text both in the header, and in the code. End with %}. When put in declaration section, the text is added before the definitions. It can be put in the last section so that the text is added after all definition in the header, and in the last section at the current position in the code.
Note that the order of these declaration is important, since they are translated into preprocessor sympols, typedef or code depending on their type. For example use %name before any %define, since the name is needed to compose the name of the define symbols. Order of %header and %union is important, since type may be undefined.
DECLARATION DEFINE SYMBOLS
These are the symbols you can define with %define in declaration section, or that are already defined. Remind that they are replaced by a preprocessor #define YY_'parser_name'_'name.
- BISON
-
defined to 1 in the code. used for conditional code. Don't redefine it.
- h_included
-
defined in the code, and in the header. used for include anti-reload. Don't redefine it.
- COMPATIBILITY
-
Indicate if obsoleted defines are to be used and produced. If defined to 0, indicate no compatibility needed, else if defined to non-0, generate it. If it is undefined, default is to be compatible if classes are not used.
- USE_GOTO
-
Indicates (if defined as 1) that goto are to be used (for backward compatibility) in the parser function. By default goto are replaced with a switch construction, to avoid problems with some compiler that don't support goto and destructor in the same function block. If COMPATIBILITY is 1, and USE_GOTO is not defined, then USE_GOTO is defined to 1, to be compatible with older bison.
- USE_CONST_TOKEN
-
Indicate (if defined as 1) that static const int are to be used in C++, for token IDs. By default an enum is used to define the token IDs instead of const.
- ENUM_TOKEN
-
When enum are used instead of static const int for token IDs, this symbol define the name of the enum type. Defined to yy_'parser_name'_enum_token by default.
- PURE
-
Indicate that %pure_parser is asked... Don't redefine it.
- LSP_NEEDED
-
if defined indicate that @ construct is used, so LLOC stack is needed. Can be defined to force use of location stack.
- DEBUG
-
if defined to non-0 activate debugging code. See YYDEBUG in bison.
- ERROR_VERBOSE
-
if defined activate dump parser stack when error append.
- STYPE
-
the type of the semantic value of token. defined by %union. default is int. See YYSTYPE in bison. Don't redefine it, if you use a %union.
- LTYPE
-
The token location type. If needed default is yyltype. See YYLTYPE in bison. default yyltype is a typedef and struct defined as in old bison.
- LLOC
-
The token location variable name. If needed, default is yylloc. See yylloc in bison.
- LVAL
-
The token semantic value variable name. Default yylval. See yylval in bison.
- CHAR
-
The lookahead token value variable name. Default yychar. See yychar in bison.
- LEX
-
The scanner function name. Default yylex. See yylex in bison.
- PARSE
-
The parser function name. Default yyparse. See yyparse in bison.
- PARSE_PARAM
-
The parser function parameters declaration. Default void in C++ or ANSIC, nothing if old C. In ANSIC and C++ contain the prototype. In old-C comtaim just the list of parameters name. Don't allows default value.
- PARSE_PARAM_DEF
-
The parser function parameters definition, for old style C. Default nothing. For example to use an int parameter called x, PARSE_PARAM is x, and PARSE_PARAM_DEF is int x;. In ANSIC or C++ it is unuseful and ignored.
- ERROR
-
The error function name. Default yyerror. See yyerror in bison.
- NERRS
-
The error count name. Default yynerrs. See yynerrs in bison.
- DEBUG_FLAG
-
The runtime debug flag. Default yydebug. See yydebug in bison.
These are only used if class is generated.
- CLASS
-
The class name. default is the parser name.
- INHERIT
-
The inheritance list. Don't forget the : before, if not empty list.
- MEMBERS
-
List of members to add to the class definition, before ending it.
- LEX_BODY
-
The scanner member function boby. May be defined to =0 for pure function, or to an inline body.
- ERROR_BODY
-
The error member function boby. May be defined to =0 for pure function, or to an inline body.
- CONSTRUCTOR_PARAM
-
List ompliance can be enforced by not using extensions. If you want to forbide them, there is a good job !
:SECTION "FUTUR WORKS"
tell us !
Support semantic parser. Is it really used ?
POSIX compliance. is'nt it good now ?
Use lex a
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- DECLARATIONS
-
- DECLARATION DEFINE SYMBOLS
-
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Time: GMT, April 13, 2002