One can define a p_error function to handle syntax errors, but
unfortunately, Ply provides no useful information to the function. I've had
to resort to an ugly reflection hack just to provide meaningful error
messages. Would it be possible to improve the interface so that Ply
actually provides access to this information?
def p_error(p):
if p is None:
print "Syntax error: unexpected EOF"
else:
print "Syntax error at line {}: unexpected token
{}".format(p.lineno, p.value)
#Ugly hack since Ply doesn't provide any useful error information
import inspect
frame = inspect.currentframe()
cvars = frame.f_back.f_locals
print 'Expected:', ', '.join(cvars['actions'][cvars[
'state']].keys())
print 'Found:', cvars['ltype']
print 'Current stack:', cvars['symstack']
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