Using a syntax similar to GNU utilities flex
and bison
, it
is possible to directly include C source text and comments verbatim into
the generated output file. This is accomplished by enclosing the region
inside left-justified surrounding ‘%{’, ‘%}’ pairs. Here is
an input fragment based on the previous example that illustrates this
feature:
%{ #include <assert.h> /* This section of code is inserted directly into the output. */ int return_month_days (struct month *months, int is_leap_year); %} struct month { char *name; int number; int days; int leap_days; }; %% january, 1, 31, 31 february, 2, 28, 29 march, 3, 31, 31 ...