Yacc Specifications[slide by John Werth.]

   %{  declarations  %}
   tokens
   %%
   translation rules
   %%
   auxiliary procedures

• declarations: #include and manifest constants (identifier declared to represent a constant).

• tokens: %token declarations used in the second section. Each token is defined as a constant (integer > 255).

• translation rules: pattern / action pairs

• auxiliary procedures: arbitrary C functions copied directly into the generated parser.