Jan. 28, 2013
11:24 a.m.
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/