nonspaceAnalyzer -- a lexical analyzer that provides non-white-space characters from a string one at a time

i1 : a = nonspaceAnalyzer " a b c "

o1 = a

o1 : FunctionClosure

i2 : peek a()

o2 = (1, "a")

i3 : peek a()

o3 = (3, "b")

i4 : peek a()

o4 = (5, "c")

i5 : peek a()

o5 = null

i6 : (constParser "abc" : nonspaceAnalyzer) " a b c "

o6 = abc