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A Bison grammar file has four main sections, shown here with the appropriate delimiters:
%{
Prologue
%}
Bison declarations
%%
Grammar rules
%%
Epilogue
Comments enclosed in ‘/* … */’ may appear in any of the sections. As a GNU extension, ‘//’ introduces a comment that continues until end of line.
| • Prologue: | Syntax and usage of the prologue. | |
| • Prologue Alternatives: | Syntax and usage of alternatives to the prologue. | |
| • Bison Declarations: | Syntax and usage of the Bison declarations section. | |
| • Grammar Rules: | Syntax and usage of the grammar rules section. | |
| • Epilogue: | Syntax and usage of the epilogue. |