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ltcalc
The C and Bison declarations for the location tracking calculator are the same as the declarations for the infix notation calculator.
/* Location tracking calculator. */ %{ #include <math.h> int yylex (void); void yyerror (char const *); %} /* Bison declarations. */ %define api.value.type {int} %token NUM %left '-' '+' %left '*' '/' %precedence NEG %right '^' %% /* The grammar follows. */
Note there are no declarations specific to locations. Defining a data
type for storing locations is not needed: we will use the type provided
by default (see Data Types of Locations), which is a
four member structure with the following integer fields:
first_line
, first_column
, last_line
and
last_column
. By conventions, and in accordance with the GNU
Coding Standards and common practice, the line and column count both
start at 1.