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Created August 14, 2012 04:43
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tutorial.rst

Parsley Tutorial

Four function calculator:

digit = anything:x ?(x in '0123456789')
number = <digit+>:ds -> int(ds)
ws = ' '*
muldiv = value:left ws ('*' value:right -> left * right
                       |'/' value:right -> left / right
                       | -> left)

expr = muldiv:left ws ('+' muldiv:right -> left + right
                        |'-' muldiv:right -> left - right
                        | -> left)
parens = '(' ws expr:e ws ')' -> e
value = ws (number | parens)
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