def see(I, want):
if I.saw:
if isinstance(I.saw, want):
return I.saw
else:
I.am_here += Toke_Whitespace.burn(I.skoarse, I.am_here)
I.saw = want.match(I.skoarse, I.am_here)
return I.saw
return None
def burn(I, want):
toke = I.saw
if toke is None:
toke = I.see(want)
if isinstance(toke, want):
I.saw = None
I.am_here += toke.burn()
I.am_here += Toke_Whitespace.burn(I.skoarse, I.am_here)
return toke
raise Exception("I tried to burn " + want.__name__ + ", but what I saw is " + toke.__class__.__name__)
