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/* ************************************************************************
qooxdoo - the new era of web development
http://qooxdoo.org
Copyright:
2006 by STZ-IDA, Germany, http://www.stz-ida.de
License:
LGPL 2.1: http://www.gnu.org/licenses/lgpl.html
Authors:
* Til Schneider (til132)
************************************************************************ */
/* ************************************************************************
************************************************************************ */
/**
* A formatter and parser for numbers.
*/
qx.OO.defineClass("qx.util.format.NumberFormat", qx.util.format.Format,
function() {
qx.util.format.Format.call(this);
});
/**
* The minimum number of integer digits (digits before the decimal separator).
* Missing digits will be filled up with 0 ("19" -> "0019").
*/
qx.OO.addProperty({ name:"minimumIntegerDigits", type:"number", defaultValue:0, allowNull:false });
/**
* The maximum number of integer digits (superfluos digits will be cut off
* ("1923" -> "23").
*/
qx.OO.addProperty({ name:"maximumIntegerDigits", type:"number", defaultValue:null });
/**
* The minimum number of fraction digits (digits after the decimal separator).
* Missing digits will be filled up with 0 ("1.5" -> "1.500")
*/
qx.OO.addProperty({ name:"minimumFractionDigits", type:"number", defaultValue:0, allowNull:false });
/**
* The maximum number of fraction digits (digits after the decimal separator).
* Superflous digits will cause rounding ("1.8277" -> "1.83")
*/
qx.OO.addProperty({ name:"maximumFractionDigits", type:"number", defaultValue:null });
/** Whether thousand groupings should be used {e.g. "1,432,234.65"}. */
qx.OO.addProperty({ name:"groupingUsed", type:"boolean", defaultValue:true, allowNull:false });
/** The prefix to put before the number {"EUR " -> "EUR 12.31"}. */
qx.OO.addProperty({ name:"prefix", type:"string", defaultValue:"", allowNull:false });
/** Sets the postfix to put after the number {" %" -> "56.13 %"}. */
qx.OO.addProperty({ name:"postfix", type:"string", defaultValue:"", allowNull:false });
/**
* Formats a number.
*
* @param num {number} the number to format.
* @return {string} the formatted number as a string.
*/
qx.Proto.format = function(num) {
var NumberFormat = qx.util.format.NumberFormat;
var negative = (num < 0);
if (negative) {
num = -num;
}
if (this.getMaximumFractionDigits() != null) {
// Do the rounding
var mover = Math.pow(10, this.getMaximumFractionDigits());
num = Math.round(num * mover) / mover;
}
if (num != 0) { // Math.log(0) = -Infinity
var integerDigits = Math.max(parseInt(Math.log(num) / Math.LN10) + 1, 1);
} else {
integerDigits = 1;
}
var numStr = "" + num;
// Prepare the integer part
var integerStr = numStr.substring(0, integerDigits);
while (integerStr.length < this.getMinimumIntegerDigits()) {
integerStr = "0" + integerStr;
}
if (this.getMaximumIntegerDigits() != null && integerStr.length > this.getMaximumIntegerDigits()) {
// NOTE: We cut off even though we did rounding before, because there
// may be rounding errors ("12.24000000000001" -> "12.24")
integerStr = integerStr.substring(integerStr.length - this.getMaximumIntegerDigits());
}
// Prepare the fraction part
var fractionStr = numStr.substring(integerDigits + 1);
while (fractionStr.length < this.getMinimumFractionDigits()) {
fractionStr += "0";
}
if (this.getMaximumFractionDigits() != -1 && fractionStr.length > this.getMaximumFractionDigits()) {
// We have already rounded -> Just cut off the rest
fractionStr = fractionStr.substring(0, this.getMaximumFractionDigits());
}
// Add the thousand groupings
if (this.getGroupingUsed()) {
var origIntegerStr = integerStr;
integerStr = "";
var groupPos;
for (groupPos = origIntegerStr.length; groupPos > 3; groupPos -= 3) {
integerStr = NumberFormat.GROUPING_SEPARATOR
+ origIntegerStr.substring(groupPos - 3, groupPos) + integerStr;
}
integerStr = origIntegerStr.substring(0, groupPos) + integerStr;
}
// Workaround: prefix and postfix are null even their defaultValue is "" and
// allowNull is set to false?!?
var prefix = this.getPrefix() ? this.getPrefix() : "";
var postfix = this.getPostfix() ? this.getPostfix() : "";
// Assemble the number
var str = prefix + (negative ? "-" : "") + integerStr;
if (fractionStr.length > 0) {
str += NumberFormat.DECIMAL_SEPARATOR + fractionStr;
}
str += postfix;
return str;
}
/**
* Parses a number.
*
* @param str {string} the string to parse.
*
* @return {double} the number.
*/
qx.Proto.parse = function(str) {
var NumberFormat = qx.util.format.NumberFormat;
// use the escaped separators for regexp
var groupSepEsc = qx.lang.String.escapeRegexpChars(NumberFormat.GROUPING_SEPARATOR);
var decimalSepEsc = qx.lang.String.escapeRegexpChars(NumberFormat.DECIMAL_SEPARATOR);
var regex = new RegExp(qx.lang.String.escapeRegexpChars(this.getPrefix())
+ '(-)?([0-9' + groupSepEsc + ']+)'
+ '(' + decimalSepEsc + '\\d+)?'
+ qx.lang.String.escapeRegexpChars(this.getPostfix()));
var hit = regex.exec(str);
if (hit == null) {
throw new Error("Number string '" + str + "' does not match the number format");
}
var negative = (hit[1] == "-");
var integerStr = hit[2];
var fractionStr = hit[3];
// Remove the thousand groupings
integerStr = integerStr.replace(new RegExp(groupSepEsc), "");
var asStr = (negative ? "-" : "") + integerStr;
if (fractionStr != null && fractionStr.length != 0) {
// Remove the leading decimal separator from the fractions string
fractionStr = fractionStr.replace(new RegExp(decimalSepEsc),"");
asStr += "." + fractionStr;
}
return parseFloat(asStr);
}
/**
* Returns the default number format.
*
* @return {NumberFormat} the default number format.
*/
qx.Class.getInstance = function() {
var NumberFormat = qx.util.format.NumberFormat;
if (NumberFormat._instance == null) {
NumberFormat._instance = new NumberFormat();
}
return NumberFormat._instance;
}
/**
* Returns an integer number format.
*
* @return {NumberFormat} an integer number format.
*/
qx.Class.getIntegerInstance = function() {
var NumberFormat = qx.util.format.NumberFormat;
if (NumberFormat._integerInstance == null) {
NumberFormat._integerInstance = new NumberFormat();
NumberFormat._integerInstance.setMaximumFractionDigits(0);
}
return NumberFormat._integerInstance;
}
/** {string} The decimal separator. */
qx.Class.DECIMAL_SEPARATOR = ".";
/** {string} The thousand grouping separator. */
qx.Class.GROUPING_SEPARATOR = ",";
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