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YAPC::EU 2018 Glasgow Update!

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Ingy döt Net 2018-08-17 15:15:24 +01:00
parent 22f33d4004
commit 4e2d22a71d
1170 changed files with 15042 additions and 3047 deletions
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52
Task/Roman-numerals-Encode/Ceylon/roman-numerals-encode.ceylon
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@ -3,29 +3,43 @@ shared void run() {
class Numeral(shared Character char, shared Integer int) {}
value tiers = [
[Numeral('I', 1), Numeral('V', 5), Numeral('X', 10)],
[Numeral('X', 10), Numeral('L', 50), Numeral('C', 100)],
[Numeral('I', 1), Numeral('V', 5), Numeral('X', 10)],
[Numeral('X', 10), Numeral('L', 50), Numeral('C', 100)],
[Numeral('C', 100), Numeral('D', 500), Numeral('M', 1k)]
];
String toRoman(Integer hindu, Integer power = 2) {
assert(exists tier = tiers[power]);
if(hindu <= 0) {
String toRoman(Integer hindu, Integer tierIndex = 2) {
assert (exists tier = tiers[tierIndex]);
" Finds if it's a two character numeral like iv, ix, xl, xc, cd and cm."
function findTwoCharacterNumeral() =>
if (exists bigNum = tier.rest.find((numeral) => numeral.int - tier.first.int <= hindu < numeral.int))
then [tier.first, bigNum]
else null;
if (hindu <= 0) {
// if it's zero then we are done!
return "";
} else if(exists num = tier.rest.find((Numeral elem) => elem.int - tier.first.int <= hindu < elem.int)) {
return "``tier.first.char````num.char````toRoman(hindu - (num.int - tier.first.int), power)``";
} else if(exists num = tier.reversed.find((Numeral elem) => hindu >= elem.int)) {
return "``num.char````toRoman(hindu - num.int, power)``";
} else {
return toRoman(hindu, power - 1);
}
else if (exists [smallNum, bigNum] = findTwoCharacterNumeral()) {
value twoCharSymbol = "``smallNum.char````bigNum.char``";
value twoCharValue = bigNum.int - smallNum.int;
return "``twoCharSymbol````toRoman(hindu - twoCharValue, tierIndex)``";
}
else if (exists num = tier.reversed.find((Numeral elem) => hindu >= elem.int)) {
return "``num.char````toRoman(hindu - num.int, tierIndex)``";
}
else {
// nothing was found so move to the next smaller tier!
return toRoman(hindu, tierIndex - 1);
}
}
assert(toRoman(1) == "I");
assert(toRoman(2) == "II");
assert(toRoman(4) == "IV");
assert(toRoman(1666) == "MDCLXVI");
assert(toRoman(1990) == "MCMXC");
assert(toRoman(2008) == "MMVIII");
assert (toRoman(1) == "I");
assert (toRoman(2) == "II");
assert (toRoman(4) == "IV");
assert (toRoman(1666) == "MDCLXVI");
assert (toRoman(1990) == "MCMXC");
assert (toRoman(2008) == "MMVIII");
}