Manual

Appendix A: Bison Symbols 117
Appendix A Bison Symbols
@$
@n
$$
$n
%%
[Variable]
In an action, the location of the left-hand side of the rule. See Section 3.6 [Locations
Overview], page 51.
[Variable]
In an action, the location of the n-th symbol of the right-hand side of the rule. See
Section 3.6 [Locations Overview], page 51.
[Variable]
In an action, the semantic value of the left-hand side of the rule. See Section 3.5.3
[Actions], page 47.
[Variable]
In an action, the semantic value of the n-th symbol of the right-hand side of the rule.
See Section 3.5.3 [Actions], page 47.
[Delimiter]
Delimiter used to separate the grammar rule section from the Bison declarations
section or the epilogue. See Section 1.9 [The Overall Layout of a Bison Grammar],
page 22.
%{code%}
[Delimiter]
All code listed between ‘%{’ and ‘%}’ is copied directly to the output file uninterpreted.
Such code forms the prologue of the input file. See Section 3.1 [Outline of a Bison
Grammar], page 41.
/*...*/
Comment delimiters, as in C.
[Construct]
:
[Delimiter]
Separates a rule’s result from its components. See Section 3.3 [Syntax of Grammar
Rules], page 44.
;
Terminates a rule. See Section 3.3 [Syntax of Grammar Rules], page 44.
[Delimiter]
|
[Delimiter]
Separates alternate rules for the same result nonterminal. See Section 3.3 [Syntax of
Grammar Rules], page 44.
$accept
[Symbol]
The predefined nonterminal whose only rule is ‘$accept: start $end’, where start
is the start symbol. See Section 3.7.9 [The Start-Symbol], page 58. It cannot be used
in the grammar.
%debug
[Directive]
Equip the parser for debugging. See Section 3.7.11 [Decl Summary], page 59.