Thank you so much, Michael !! On 22 Nov 2016 7:12 pm, "Michael Ferguson" <[email protected]> wrote:
> Hi - > > On 11/21/16, 10:16 PM, "Tomsy Paul" <[email protected]> wrote: > > >Hello all, > > > > > >I am going through the chapel grammar (chapel.ypp). I miss something in > >understanding the rules of stmt, to be precise, assignment_stmt involving > >array elements on lhs. How does lhs_expr derive array expressions. for > >example, the derivation of > > > > > >A[i] = 10; > > > > > >Could you please give the derivation of this statement. > > I'm basing this on looking through chapel.ypp (rather than, > say, debugging output). > > A[i] = 10; > > turns into the tokens > > TIDENT TLSBR TIDENT TRSBR TASSIGN INTLITERAL TSEMI > > using assignment_stmt, we have > lhs_expr TASSIGN expr TSEMI > > where lhs_expr is TIDENT TLSBR TIDENT TRSBR > and expr is INTLITERAL > > then going in to lhs_expr, we have call_expr > as one of the options. So now we have a > call_expr TIDENT TLSBR TIDENT TRSBR > > and we match the rule > call_expr: fun_expr TLSBR opt_actual_ls TRSBR > > where > > fun_expr is TIDENT (which is A) > opt_actual_ls is going to match TIDENT (for i) > but I won't go into detail on that here > (but in this case it becomes actual_expr which becomes expr) > > Cheers, > > -michael > >
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