# File examples/eyapplanguageref/Postfix.eyp
# Compile it with: eyapp -C Postfix.eyp
# Execution: ./Postfix.pm
%token NUM =/([0-9]+(?:\.[0-9]+)?)/
%token VAR =/([A-Za-z][A-Za-z0-9_]*)/
%right '='
%left '-' '+'
%left '*' '/'
%left NEG
%%
line:
exp
;
exp:
NUM
| VAR
| VAR '=' exp
| exp '+' exp
| exp '-' exp
| exp '*' exp
| exp '/' exp
| '-' exp %prec NEG
| '(' exp ')'
;
%%