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# romanNumerals.py
#
# Copyright (c) 2006, Paul McGuire
#
from pyparsing import *
def romanNumeralLiteral(numeralString, value):
return Literal(numeralString).setParseAction(replaceWith(value))
one = romanNumeralLiteral("I",1)
four = romanNumeralLiteral("IV",4)
five = romanNumeralLiteral("V",5)
nine = romanNumeralLiteral("IX",9)
ten = romanNumeralLiteral("X",10)
forty = romanNumeralLiteral("XL",40)
fifty = romanNumeralLiteral("L",50)
ninety = romanNumeralLiteral("XC",90)
onehundred = romanNumeralLiteral("C",100)
fourhundred = romanNumeralLiteral("CD",400)
fivehundred = romanNumeralLiteral("D",500)
ninehundred = romanNumeralLiteral("CM",900)
onethousand = romanNumeralLiteral("M",1000)
numeral = ( onethousand | ninehundred | fivehundred | fourhundred |
onehundred | ninety | fifty | forty | ten | nine | five |
four | one ).leaveWhitespace()
romanNumeral = OneOrMore(numeral).setParseAction( lambda s,l,t : sum(t) )
# unit tests
def makeRomanNumeral(n):
def addDigit(n,limit,c,s):
n -= limit
s += c
return n,s
ret = ""
while n >= 1000: n,ret = addDigit(n,1000,"M",ret)
while n >= 900: n,ret = addDigit(n, 900,"CM",ret)
while n >= 500: n,ret = addDigit(n, 500,"D",ret)
while n >= 400: n,ret = addDigit(n, 400,"CD",ret)
while n >= 100: n,ret = addDigit(n, 100,"C",ret)
while n >= 90: n,ret = addDigit(n, 90,"XC",ret)
while n >= 50: n,ret = addDigit(n, 50,"L",ret)
while n >= 40: n,ret = addDigit(n, 40,"XL",ret)
while n >= 10: n,ret = addDigit(n, 10,"X",ret)
while n >= 9: n,ret = addDigit(n, 9,"IX",ret)
while n >= 5: n,ret = addDigit(n, 5,"V",ret)
while n >= 4: n,ret = addDigit(n, 4,"IV",ret)
while n >= 1: n,ret = addDigit(n, 1,"I",ret)
return ret
tests = " ".join(makeRomanNumeral(i) for i in range(1,5000+1))
roman_int_map = {}
expected = 1
for t,s,e in romanNumeral.scanString(tests):
orig = tests[s:e]
if t[0] != expected:
print("{0} {1} {2}".format("==>", t, orig))
roman_int_map[orig] = t[0]
expected += 1
def verify_value(s, tokens):
expected = roman_int_map[s]
if tokens[0] != expected:
raise Exception("incorrect value for {0} ({1}), expected {2}".format(s, tokens[0], expected ))
romanNumeral.runTests("""\
XVI
XXXIX
XIV
XIX
MCMLXXX
MMVI
""", fullDump=False,
postParse=verify_value)
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