Hello,
Does anybody have any insights on the relative merits of using
precedence values versus explicit precedence encoding using a larger
number of rules. To make the latter more concrete, take this excerpt
from the Python grammar description at
http://www.python.org/doc/2.5.2/ref/grammar.txt:
power ::= primary ["**" u_expr]
u_expr ::= power | "-" u_expr | "+" u_expr | "\~" u_expr
m_expr ::= u_expr
| m_expr "*" u_expr
| m_expr "//" u_expr
| m_expr "/" u_expr
| m_expr "\%" u_expr
a_expr ::= m_expr | a_expr "+" m_expr | a_expr "-" m_expr
shift_expr ::= a_expr | shift_expr ( "<<" | ">>" ) a_expr
Thanks in advance,
Paul
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