Manual

118 Bison 2.3
%defines
[Directive]
Bison declaration to create a header file meant for the scanner. See Section 3.7.11
[Decl Summary], page 59.
%destructor
[Directive]
Specify how the parser should reclaim the memory associated to discarded symbols.
See Section 3.7.7 [Freeing Discarded Symbols], page 57.
%dprec
[Directive]
Bison declaration to assign a precedence to a rule that is used at parse time to resolve
reduce/reduce conflicts. See Section 1.5 [Writing GLR Parsers], page 14.
$end
[Symbol]
The predefined token marking the end of the token stream. It cannot be used in the
grammar.
error
[Symbol]
A token name reserved for error recovery. This token may be used in grammar rules
so as to allow the Bison parser to recognize an error in the grammar without halting
the process. In effect, a sentence containing an error may be recognized as valid.
On a syntax error, the token error becomes the current look-ahead token. Actions
corresponding to error are then executed, and the look-ahead token is reset to the
token that originally caused the violation. See Chapter 6 [Error Recovery], page 83.
%error-verbose
[Directive]
Bison declaration to request verbose, specific error message strings when yyerror is
called.
%file-prefix="prefix"
[Directive]
Bison declaration to set the prefix of the output files. See Section 3.7.11 [Decl Summary],
page 59.
%glr-parser
[Directive]
Bison declaration to produce a GLR parser. See Section 1.5 [Writing GLR Parsers],
page 14.
%initial-action
[Directive]
Run user code before parsing. See Section 3.7.6 [Performing Actions before Parsing],
page 56.
%left
[Directive]
Bison declaration to assign left associativity to token(s). See Section 3.7.3 [Operator
Precedence], page 55.
%lex-param {argument-declaration}
[Directive]
Bison declaration to specifying an additional parameter that yylex should accept.
See Section 4.2.4 [Calling Conventions for Pure Parsers], page 66.
%merge
[Directive]
Bison declaration to assign a merging function to a rule. If there is a reduce/reduce
conflict with a rule having the same merging function, the function is applied to the