look at PPExpressionParser class. it's designed for that and you have a great example in the class comment
2013/1/28 Hilaire Fernandes <[email protected]> > Hello > > I try to extent the example of the arithmetic evaluator[1], I don't > understand the magic underneath nor how you will make it works with > substraction. > > Changing method add to: > > add > ^ prod, ($+ asParser / $- asParser) trim, term > > > to parse mixture addition and substraction is wrong: > > parser parse: '1 - 2 + 6' -> #(1 $- #(2 $+ 6)) > > > The precedence is wrong. > > How will you make it work? It seems to me the way to handle precedence > in the example is not suited for extension > > Thanks > > Hilaire > > > > [1] http://pharobooks.gforge.inria.fr/PharoByExampleTwo-Eng/latest/ > > > -- *Guillaume Larcheveque*
