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123 lines
4.1 KiB
JavaScript
123 lines
4.1 KiB
JavaScript
function convertCurrency(currencyDigits) {
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// Constants:
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var MAXIMUM_NUMBER = 99999999999.99;
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// Predefine the radix characters and currency symbols for output:
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var CN_ZERO = "零";
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var CN_ONE = "壹";
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var CN_TWO = "贰";
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var CN_THREE = "叁";
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var CN_FOUR = "肆";
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var CN_FIVE = "伍";
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var CN_SIX = "陆";
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var CN_SEVEN = "柒";
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var CN_EIGHT = "捌";
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var CN_NINE = "玖";
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var CN_TEN = "拾";
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var CN_HUNDRED = "佰";
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var CN_THOUSAND = "仟";
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var CN_TEN_THOUSAND = "万";
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var CN_HUNDRED_MILLION = "亿";
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var CN_SYMBOL = "人民币";
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var CN_DOLLAR = "元";
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var CN_TEN_CENT = "角";
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var CN_CENT = "分";
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var CN_INTEGER = "整";
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// Variables:
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var integral; // Represent integral part of digit number.
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var decimal; // Represent decimal part of digit number.
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var outputCharacters; // The output result.
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var parts;
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var digits, radices, bigRadices, decimals;
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var zeroCount;
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var i, p, d;
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var quotient, modulus;
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// Validate input string:
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currencyDigits = currencyDigits.toString();
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if (currencyDigits == "") {
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alert("Empty input!");
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return "";
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}
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if (currencyDigits.match(/[^,.\d]/) != null) {
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alert("Invalid characters in the input string!");
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return "";
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}
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if ((currencyDigits).match(/^((\d{1,3}(,\d{3})*(.((\d{3},)*\d{1,3}))?)|(\d+(.\d+)?))$/) == null) {
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alert("Illegal format of digit number!");
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return "";
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}
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// Normalize the format of input digits:
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currencyDigits = currencyDigits.replace(/,/g, ""); // Remove comma delimiters.
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currencyDigits = currencyDigits.replace(/^0+/, ""); // Trim zeros at the beginning.
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// Assert the number is not greater than the maximum number.
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if (Number(currencyDigits) > MAXIMUM_NUMBER) {
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alert("Too large a number to convert!");
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return "";
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}
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// Process the coversion from currency digits to characters:
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// Separate integral and decimal parts before processing coversion:
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parts = currencyDigits.split(".");
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if (parts.length > 1) {
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integral = parts[0];
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decimal = parts[1];
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// Cut down redundant decimal digits that are after the second.
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decimal = decimal.substr(0, 2);
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}
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else {
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integral = parts[0];
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decimal = "";
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}
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// Prepare the characters corresponding to the digits:
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digits = new Array(CN_ZERO, CN_ONE, CN_TWO, CN_THREE, CN_FOUR, CN_FIVE, CN_SIX, CN_SEVEN, CN_EIGHT, CN_NINE);
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radices = new Array("", CN_TEN, CN_HUNDRED, CN_THOUSAND);
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bigRadices = new Array("", CN_TEN_THOUSAND, CN_HUNDRED_MILLION);
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decimals = new Array(CN_TEN_CENT, CN_CENT);
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// Start processing:
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outputCharacters = "";
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// Process integral part if it is larger than 0:
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if (Number(integral) > 0) {
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zeroCount = 0;
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for (i = 0; i < integral.length; i++) {
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p = integral.length - i - 1;
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d = integral.substr(i, 1);
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quotient = p / 4;
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modulus = p % 4;
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if (d == "0") {
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zeroCount++;
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}
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else {
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if (zeroCount > 0) {
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outputCharacters += digits[0];
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}
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zeroCount = 0;
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outputCharacters += digits[Number(d)] + radices[modulus];
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}
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if (modulus == 0 && zeroCount < 4) {
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outputCharacters += bigRadices[quotient];
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zeroCount = 0;
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}
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}
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outputCharacters += CN_DOLLAR;
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}
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// Process decimal part if there is:
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if (decimal != "") {
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for (i = 0; i < decimal.length; i++) {
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d = decimal.substr(i, 1);
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if (d != "0") {
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outputCharacters += digits[Number(d)] + decimals[i];
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}
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}
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}
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// Confirm and return the final output string:
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if (outputCharacters == "") {
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outputCharacters = CN_ZERO + CN_DOLLAR;
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}
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if (decimal == "") {
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outputCharacters += CN_INTEGER;
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}
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outputCharacters = CN_SYMBOL + outputCharacters;
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return outputCharacters;
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}
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