english2number
Version:
Converts English words to numbers.
83 lines (79 loc) • 2.8 kB
JavaScript
(function() {
var english2Number, large, small;
small = {
'zero': 0,
'one': 1,
'two': 2,
'three': 3,
'four': 4,
'five': 5,
'six': 6,
'seven': 7,
'eight': 8,
'nine': 9,
'ten': 10,
'eleven': 11,
'twelve': 12,
'thirteen': 13,
'fourteen': 14,
'fifteen': 15,
'sixteen': 16,
'seventeen': 17,
'eighteen': 18,
'nineteen': 19,
'twenty': 20,
'thirty': 30,
'forty': 40,
'fifty': 50,
'sixty': 60,
'seventy': 70,
'eighty': 80,
'ninety': 90
};
large = {
'thousand': 1000,
'million': 1000000,
'billion': 1000000000,
'trillion': 1000000000000,
'quadrillion': 1000000000000000,
'quintillion': 1000000000000000000,
'sextillion': 1000000000000000000000,
'septillion': 1000000000000000000000000,
'octillion': 1000000000000000000000000000,
'nonillion': 1000000000000000000000000000000,
'decillion': 1000000000000000000000000000000000
};
english2Number = function(english) {
var current, exponent, i, int, len, product, total, word, words, negative;
if (!isNaN(int = parseInt(english, 10))) {
return int;
}
negative = english.indexOf("negative") === 0 || english.indexOf("-") === 0;
words = english.replace(/\sand\s/g, " ").replace(/^negative\s/,"").replace(/^-\s/,"").replace(/^a\s/,"one ").replace(/,\s/g, " ").replace(/first/g, "one").replace(/second/g, "two").replace(/third/g, "three").replace(/fourth/g, "four").replace(/fifth/g, "five").replace(/eighth/g, "eight").replace(/ninth/g, "nine").replace(/twelfth/g, "twelve").replace(/twentieth/g, "twenty").replace(/fiftieth/g, "fifty").replace(/seventieth/g, "seventy").replace(/ninetieth/g, "ninety").replace(/(i|ie)?th(\b|-|$)/g, "").split(/[\s-]+/);
total = 0;
current = 0;
for (i = 0, len = words.length; i < len; i++) {
word = words[i];
product = small[word];
if (product !== undefined) {
current += product;
} else if (word === "hundred" && current !== 0) {
current *= 100;
} else {
exponent = large[word];
if (exponent) {
total += current * exponent;
current = 0;
} else {
throw new Error("Unknown number: " + word);
}
}
}
var output = total + current;
if(negative){
return output * -1;
}
return output;
};
module.exports = english2Number;
}).call(this);