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import sys
# fmt: off
ELEMENTS = [
"Ac", "Ag", "Al", "Am", "Ar", "As", "At", "Au", "B", "Ba", "Be", "Bh",
"Bi", "Bk", "Br", "C", "Ca", "Cd", "Ce", "Cf", "Cl", "Cm", "Cn", "Co",
"Cr", "Cs", "Cu", "Db", "Ds", "Dy", "Er", "Es", "Eu", "F", "Fe", "Fl",
"Fm", "Fr", "Ga", "Gd", "Ge", "H", "He", "Hf", "Hg", "Ho", "Hs", "I",
"In", "Ir", "K", "Kr", "La", "Li", "Lr", "Lu", "Lv", "Mc", "Md", "Mg",
"Mn", "Mo", "Mt", "N", "Na", "Nb", "Nd", "Ne", "Nh", "Ni", "No", "Np",
"O", "Og", "Os", "P", "Pa", "Pb", "Pd", "Pm", "Po", "Pr", "Pt", "Pu",
"Ra", "Rb", "Re", "Rf", "Rg", "Rh", "Rn", "Ru", "S", "Sb", "Sc", "Se",
"Sg", "Si", "Sm", "Sn", "Sr", "Ta", "Tb", "Tc", "Te", "Th", "Ti", "Tl",
"Tm", "Ts", "U", "V", "W", "Xe", "Y", "Yb", "Zn", "Zr"
]
# fmt: on
elements = [el.lower().encode() for el in ELEMENTS]
def search(start, length, shift, char):
upper = start + length
lower = start
while lower < upper:
mid = int((lower + upper) / 2)
if elements[mid][shift] < char:
lower = mid + 1
else:
upper = mid
if lower == start + length:
return (0, 0)
if elements[lower][shift] != char:
return (0, 0)
upper = start + length
start = lower
while lower < upper:
mid = int((lower + upper) / 2)
if char < elements[mid][shift]:
upper = mid
else:
lower = mid + 1
length = upper - start
return (start, length)
def divide(tail):
result = []
start = 0
length = len(ELEMENTS)
shift = 0
while shift < len(tail):
start, length = search(start, length, shift, tail[shift])
if length == 0:
break
shift += 1
if len(elements[start]) == shift:
result.append((ELEMENTS[start], tail[shift:]))
start += 1
length -= 1
return result or [("?", tail[1:])]
def advance(els, tail):
return [(els + [e], t) for (e, t) in divide(tail)]
def explode(word):
result = [([], word.lower().encode())]
while result[0][1]:
new = []
for res in result:
if res[1]:
adv = advance(*res)
new.extend(adv)
else:
new.append(res)
result = new
return [els for els, _ in result]
for w in sys.argv[1:]:
print(w + ":")
for f in filter(None, explode(w)):
print(" " + " ".join(f))
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