Re: Help improve program for parsing simple rules

On Apr 17, 1:26 pm, Aaron Brady <castiro...@xxxxxxxxx> wrote:
Hi, not to offend; I don't know your background.  

Courtesy on Usenet!!! I'm going to go buy a lottery ticket!

Not to worry, I'm a big boy. People have even called my baby ugly,
and I manage to keep my blood pressure under control.

One thing I like
about Python is it and the docs are careful about short-circuiting
conditions.  ISTR that C left some of those details up to the compiler
at one point.

def f():

...     print( 'in f' )
...     return 10
...>>> 0<f()<20

in f
True>>> 0<f() and f()<20

in f
in f
True

Therefore, if op{n} has side effects, 'op1 operator1 op2 AND op2
operator2 op3' is not equivalent to 'op1 optor1 op2 optor2 op3'.

Interesting point, but I don't remember that "A < B < C" is valid C
syntax, are you perhaps thinking of a different language?

By luck, my implementation of EvalComparisonOp.eval does in fact
capture the post-eval value of op2, so that if its evaluation caused
any side effects, they would not be repeated.

-- Paul

.

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