source: Dev/trunk/src/client/dojo/number.js

define([/*===== "./_base/declare", =====*/ "./_base/lang", "./i18n", "./i18n!./cldr/nls/number", "./string", "./regexp"],
        function(/*===== declare, =====*/ lang, i18n, nlsNumber, dstring, dregexp){

// module:
//              dojo/number

var number = {
        // summary:
        //              localized formatting and parsing routines for Number
};
lang.setObject("dojo.number", number);

/*=====
number.__FormatOptions = declare(null, {
        // pattern: String?
        //              override [formatting pattern](http://www.unicode.org/reports/tr35/#Number_Format_Patterns)
        //              with this string.  Default value is based on locale.  Overriding this property will defeat
        //              localization.  Literal characters in patterns are not supported.
        // type: String?
        //              choose a format type based on the locale from the following:
        //              decimal, scientific (not yet supported), percent, currency. decimal by default.
        // places: Number?
        //              fixed number of decimal places to show.  This overrides any
        //              information in the provided pattern.
        // round: Number?
        //              5 rounds to nearest .5; 0 rounds to nearest whole (default). -1
        //              means do not round.
        // locale: String?
        //              override the locale used to determine formatting rules
        // fractional: Boolean?
        //              If false, show no decimal places, overriding places and pattern settings.
});
=====*/

number.format = function(/*Number*/ value, /*number.__FormatOptions?*/ options){
        // summary:
        //              Format a Number as a String, using locale-specific settings
        // description:
        //              Create a string from a Number using a known localized pattern.
        //              Formatting patterns appropriate to the locale are chosen from the
        //              [Common Locale Data Repository](http://unicode.org/cldr) as well as the appropriate symbols and
        //              delimiters.
        //              If value is Infinity, -Infinity, or is not a valid JavaScript number, return null.
        // value:
        //              the number to be formatted

        options = lang.mixin({}, options || {});
        var locale = i18n.normalizeLocale(options.locale),
                bundle = i18n.getLocalization("dojo.cldr", "number", locale);
        options.customs = bundle;
        var pattern = options.pattern || bundle[(options.type || "decimal") + "Format"];
        if(isNaN(value) || Math.abs(value) == Infinity){ return null; } // null
        return number._applyPattern(value, pattern, options); // String
};

//number._numberPatternRE = /(?:[#0]*,?)*[#0](?:\.0*#*)?/; // not precise, but good enough
number._numberPatternRE = /[#0,]*[#0](?:\.0*#*)?/; // not precise, but good enough

number._applyPattern = function(/*Number*/ value, /*String*/ pattern, /*number.__FormatOptions?*/ options){
        // summary:
        //              Apply pattern to format value as a string using options. Gives no
        //              consideration to local customs.
        // value:
        //              the number to be formatted.
        // pattern:
        //              a pattern string as described by
        //              [unicode.org TR35](http://www.unicode.org/reports/tr35/#Number_Format_Patterns)
        // options: number.__FormatOptions?
        //              _applyPattern is usually called via `dojo/number.format()` which
        //              populates an extra property in the options parameter, "customs".
        //              The customs object specifies group and decimal parameters if set.

        //TODO: support escapes
        options = options || {};
        var group = options.customs.group,
                decimal = options.customs.decimal,
                patternList = pattern.split(';'),
                positivePattern = patternList[0];
        pattern = patternList[(value < 0) ? 1 : 0] || ("-" + positivePattern);

        //TODO: only test against unescaped
        if(pattern.indexOf('%') != -1){
                value *= 100;
        }else if(pattern.indexOf('\u2030') != -1){
                value *= 1000; // per mille
        }else if(pattern.indexOf('\u00a4') != -1){
                group = options.customs.currencyGroup || group;//mixins instead?
                decimal = options.customs.currencyDecimal || decimal;// Should these be mixins instead?
                pattern = pattern.replace(/\u00a4{1,3}/, function(match){
                        var prop = ["symbol", "currency", "displayName"][match.length-1];
                        return options[prop] || options.currency || "";
                });
        }else if(pattern.indexOf('E') != -1){
                throw new Error("exponential notation not supported");
        }

        //TODO: support @ sig figs?
        var numberPatternRE = number._numberPatternRE;
        var numberPattern = positivePattern.match(numberPatternRE);
        if(!numberPattern){
                throw new Error("unable to find a number expression in pattern: "+pattern);
        }
        if(options.fractional === false){ options.places = 0; }
        return pattern.replace(numberPatternRE,
                number._formatAbsolute(value, numberPattern[0], {decimal: decimal, group: group, places: options.places, round: options.round}));
};

number.round = function(/*Number*/ value, /*Number?*/ places, /*Number?*/ increment){
        // summary:
        //              Rounds to the nearest value with the given number of decimal places, away from zero
        // description:
        //              Rounds to the nearest value with the given number of decimal places, away from zero if equal.
        //              Similar to Number.toFixed(), but compensates for browser quirks. Rounding can be done by
        //              fractional increments also, such as the nearest quarter.
        //              NOTE: Subject to floating point errors.  See dojox/math/round for experimental workaround.
        // value:
        //              The number to round
        // places:
        //              The number of decimal places where rounding takes place.  Defaults to 0 for whole rounding.
        //              Must be non-negative.
        // increment:
        //              Rounds next place to nearest value of increment/10.  10 by default.
        // example:
        // |    >>> number.round(-0.5)
        // |    -1
        // |    >>> number.round(162.295, 2)
        // |    162.29  // note floating point error.  Should be 162.3
        // |    >>> number.round(10.71, 0, 2.5)
        // |    10.75
        var factor = 10 / (increment || 10);
        return (factor * +value).toFixed(places) / factor; // Number
};

if((0.9).toFixed() == 0){
        // (isIE) toFixed() bug workaround: Rounding fails on IE when most significant digit
        // is just after the rounding place and is >=5
        var round = number.round;
        number.round = function(v, p, m){
                var d = Math.pow(10, -p || 0), a = Math.abs(v);
                if(!v || a >= d){
                        d = 0;
                }else{
                        a /= d;
                        if(a < 0.5 || a >= 0.95){
                                d = 0;
                        }
                }
                return round(v, p, m) + (v > 0 ? d : -d);
        };

        // Use "doc hint" so the doc parser ignores this new definition of round(), and uses the one above.
        /*===== number.round = round; =====*/
}

/*=====
number.__FormatAbsoluteOptions = declare(null, {
        // decimal: String?
        //              the decimal separator
        // group: String?
        //              the group separator
        // places: Number|String?
        //              number of decimal places.  the range "n,m" will format to m places.
        // round: Number?
        //              5 rounds to nearest .5; 0 rounds to nearest whole (default). -1
        //              means don't round.
});
=====*/

number._formatAbsolute = function(/*Number*/ value, /*String*/ pattern, /*number.__FormatAbsoluteOptions?*/ options){
        // summary:
        //              Apply numeric pattern to absolute value using options. Gives no
        //              consideration to local customs.
        // value:
        //              the number to be formatted, ignores sign
        // pattern:
        //              the number portion of a pattern (e.g. `#,##0.00`)
        options = options || {};
        if(options.places === true){options.places=0;}
        if(options.places === Infinity){options.places=6;} // avoid a loop; pick a limit

        var patternParts = pattern.split("."),
                comma = typeof options.places == "string" && options.places.indexOf(","),
                maxPlaces = options.places;
        if(comma){
                maxPlaces = options.places.substring(comma + 1);
        }else if(!(maxPlaces >= 0)){
                maxPlaces = (patternParts[1] || []).length;
        }
        if(!(options.round < 0)){
                value = number.round(value, maxPlaces, options.round);
        }

        var valueParts = String(Math.abs(value)).split("."),
                fractional = valueParts[1] || "";
        if(patternParts[1] || options.places){
                if(comma){
                        options.places = options.places.substring(0, comma);
                }
                // Pad fractional with trailing zeros
                var pad = options.places !== undefined ? options.places : (patternParts[1] && patternParts[1].lastIndexOf("0") + 1);
                if(pad > fractional.length){
                        valueParts[1] = dstring.pad(fractional, pad, '0', true);
                }

                // Truncate fractional
                if(maxPlaces < fractional.length){
                        valueParts[1] = fractional.substr(0, maxPlaces);
                }
        }else{
                if(valueParts[1]){ valueParts.pop(); }
        }

        // Pad whole with leading zeros
        var patternDigits = patternParts[0].replace(',', '');
        pad = patternDigits.indexOf("0");
        if(pad != -1){
                pad = patternDigits.length - pad;
                if(pad > valueParts[0].length){
                        valueParts[0] = dstring.pad(valueParts[0], pad);
                }

                // Truncate whole
                if(patternDigits.indexOf("#") == -1){
                        valueParts[0] = valueParts[0].substr(valueParts[0].length - pad);
                }
        }

        // Add group separators
        var index = patternParts[0].lastIndexOf(','),
                groupSize, groupSize2;
        if(index != -1){
                groupSize = patternParts[0].length - index - 1;
                var remainder = patternParts[0].substr(0, index);
                index = remainder.lastIndexOf(',');
                if(index != -1){
                        groupSize2 = remainder.length - index - 1;
                }
        }
        var pieces = [];
        for(var whole = valueParts[0]; whole;){
                var off = whole.length - groupSize;
                pieces.push((off > 0) ? whole.substr(off) : whole);
                whole = (off > 0) ? whole.slice(0, off) : "";
                if(groupSize2){
                        groupSize = groupSize2;
                        delete groupSize2;
                }
        }
        valueParts[0] = pieces.reverse().join(options.group || ",");

        return valueParts.join(options.decimal || ".");
};

/*=====
number.__RegexpOptions = declare(null, {
        // pattern: String?
        //              override [formatting pattern](http://www.unicode.org/reports/tr35/#Number_Format_Patterns)
        //              with this string.  Default value is based on locale.  Overriding this property will defeat
        //              localization.
        // type: String?
        //              choose a format type based on the locale from the following:
        //              decimal, scientific (not yet supported), percent, currency. decimal by default.
        // locale: String?
        //              override the locale used to determine formatting rules
        // strict: Boolean?
        //              strict parsing, false by default.  Strict parsing requires input as produced by the format() method.
        //              Non-strict is more permissive, e.g. flexible on white space, omitting thousands separators
        // places: Number|String?
        //              number of decimal places to accept: Infinity, a positive number, or
        //              a range "n,m".  Defined by pattern or Infinity if pattern not provided.
});
=====*/
number.regexp = function(/*number.__RegexpOptions?*/ options){
        // summary:
        //              Builds the regular needed to parse a number
        // description:
        //              Returns regular expression with positive and negative match, group
        //              and decimal separators
        return number._parseInfo(options).regexp; // String
};

number._parseInfo = function(/*Object?*/ options){
        options = options || {};
        var locale = i18n.normalizeLocale(options.locale),
                bundle = i18n.getLocalization("dojo.cldr", "number", locale),
                pattern = options.pattern || bundle[(options.type || "decimal") + "Format"],
//TODO: memoize?
                group = bundle.group,
                decimal = bundle.decimal,
                factor = 1;

        if(pattern.indexOf('%') != -1){
                factor /= 100;
        }else if(pattern.indexOf('\u2030') != -1){
                factor /= 1000; // per mille
        }else{
                var isCurrency = pattern.indexOf('\u00a4') != -1;
                if(isCurrency){
                        group = bundle.currencyGroup || group;
                        decimal = bundle.currencyDecimal || decimal;
                }
        }

        //TODO: handle quoted escapes
        var patternList = pattern.split(';');
        if(patternList.length == 1){
                patternList.push("-" + patternList[0]);
        }

        var re = dregexp.buildGroupRE(patternList, function(pattern){
                pattern = "(?:"+dregexp.escapeString(pattern, '.')+")";
                return pattern.replace(number._numberPatternRE, function(format){
                        var flags = {
                                signed: false,
                                separator: options.strict ? group : [group,""],
                                fractional: options.fractional,
                                decimal: decimal,
                                exponent: false
                                },

                                parts = format.split('.'),
                                places = options.places;

                        // special condition for percent (factor != 1)
                        // allow decimal places even if not specified in pattern
                        if(parts.length == 1 && factor != 1){
                            parts[1] = "###";
                        }
                        if(parts.length == 1 || places === 0){
                                flags.fractional = false;
                        }else{
                                if(places === undefined){ places = options.pattern ? parts[1].lastIndexOf('0') + 1 : Infinity; }
                                if(places && options.fractional == undefined){flags.fractional = true;} // required fractional, unless otherwise specified
                                if(!options.places && (places < parts[1].length)){ places += "," + parts[1].length; }
                                flags.places = places;
                        }
                        var groups = parts[0].split(',');
                        if(groups.length > 1){
                                flags.groupSize = groups.pop().length;
                                if(groups.length > 1){
                                        flags.groupSize2 = groups.pop().length;
                                }
                        }
                        return "("+number._realNumberRegexp(flags)+")";
                });
        }, true);

        if(isCurrency){
                // substitute the currency symbol for the placeholder in the pattern
                re = re.replace(/([\s\xa0]*)(\u00a4{1,3})([\s\xa0]*)/g, function(match, before, target, after){
                        var prop = ["symbol", "currency", "displayName"][target.length-1],
                                symbol = dregexp.escapeString(options[prop] || options.currency || "");
                        before = before ? "[\\s\\xa0]" : "";
                        after = after ? "[\\s\\xa0]" : "";
                        if(!options.strict){
                                if(before){before += "*";}
                                if(after){after += "*";}
                                return "(?:"+before+symbol+after+")?";
                        }
                        return before+symbol+after;
                });
        }

//TODO: substitute localized sign/percent/permille/etc.?

        // normalize whitespace and return
        return {regexp: re.replace(/[\xa0 ]/g, "[\\s\\xa0]"), group: group, decimal: decimal, factor: factor}; // Object
};

/*=====
number.__ParseOptions = declare(null, {
        // pattern: String?
        //              override [formatting pattern](http://www.unicode.org/reports/tr35/#Number_Format_Patterns)
        //              with this string.  Default value is based on locale.  Overriding this property will defeat
        //              localization.  Literal characters in patterns are not supported.
        // type: String?
        //              choose a format type based on the locale from the following:
        //              decimal, scientific (not yet supported), percent, currency. decimal by default.
        // locale: String?
        //              override the locale used to determine formatting rules
        // strict: Boolean?
        //              strict parsing, false by default.  Strict parsing requires input as produced by the format() method.
        //              Non-strict is more permissive, e.g. flexible on white space, omitting thousands separators
        // fractional: Boolean|Array?
        //              Whether to include the fractional portion, where the number of decimal places are implied by pattern
        //              or explicit 'places' parameter.  The value [true,false] makes the fractional portion optional.
});
=====*/
number.parse = function(/*String*/ expression, /*number.__ParseOptions?*/ options){
        // summary:
        //              Convert a properly formatted string to a primitive Number, using
        //              locale-specific settings.
        // description:
        //              Create a Number from a string using a known localized pattern.
        //              Formatting patterns are chosen appropriate to the locale
        //              and follow the syntax described by
        //              [unicode.org TR35](http://www.unicode.org/reports/tr35/#Number_Format_Patterns)
        //              Note that literal characters in patterns are not supported.
        // expression:
        //              A string representation of a Number
        var info = number._parseInfo(options),
                results = (new RegExp("^"+info.regexp+"$")).exec(expression);
        if(!results){
                return NaN; //NaN
        }
        var absoluteMatch = results[1]; // match for the positive expression
        if(!results[1]){
                if(!results[2]){
                        return NaN; //NaN
                }
                // matched the negative pattern
                absoluteMatch =results[2];
                info.factor *= -1;
        }

        // Transform it to something Javascript can parse as a number.  Normalize
        // decimal point and strip out group separators or alternate forms of whitespace
        absoluteMatch = absoluteMatch.
                replace(new RegExp("["+info.group + "\\s\\xa0"+"]", "g"), "").
                replace(info.decimal, ".");
        // Adjust for negative sign, percent, etc. as necessary
        return absoluteMatch * info.factor; //Number
};

/*=====
number.__RealNumberRegexpFlags = declare(null, {
        // places: Number?
        //              The integer number of decimal places or a range given as "n,m".  If
        //              not given, the decimal part is optional and the number of places is
        //              unlimited.
        // decimal: String?
        //              A string for the character used as the decimal point.  Default
        //              is ".".
        // fractional: Boolean|Array?
        //              Whether decimal places are used.  Can be true, false, or [true,
        //              false].  Default is [true, false] which means optional.
        // exponent: Boolean|Array?
        //              Express in exponential notation.  Can be true, false, or [true,
        //              false]. Default is [true, false], (i.e. will match if the
        //              exponential part is present are not).
        // eSigned: Boolean|Array?
        //              The leading plus-or-minus sign on the exponent.  Can be true,
        //              false, or [true, false].  Default is [true, false], (i.e. will
        //              match if it is signed or unsigned).  flags in regexp.integer can be
        //              applied.
});
=====*/

number._realNumberRegexp = function(/*__RealNumberRegexpFlags?*/ flags){
        // summary:
        //              Builds a regular expression to match a real number in exponential
        //              notation

        // assign default values to missing parameters
        flags = flags || {};
        //TODO: use mixin instead?
        if(!("places" in flags)){ flags.places = Infinity; }
        if(typeof flags.decimal != "string"){ flags.decimal = "."; }
        if(!("fractional" in flags) || /^0/.test(flags.places)){ flags.fractional = [true, false]; }
        if(!("exponent" in flags)){ flags.exponent = [true, false]; }
        if(!("eSigned" in flags)){ flags.eSigned = [true, false]; }

        var integerRE = number._integerRegexp(flags),
                decimalRE = dregexp.buildGroupRE(flags.fractional,
                function(q){
                        var re = "";
                        if(q && (flags.places!==0)){
                                re = "\\" + flags.decimal;
                                if(flags.places == Infinity){
                                        re = "(?:" + re + "\\d+)?";
                                }else{
                                        re += "\\d{" + flags.places + "}";
                                }
                        }
                        return re;
                },
                true
        );

        var exponentRE = dregexp.buildGroupRE(flags.exponent,
                function(q){
                        if(q){ return "([eE]" + number._integerRegexp({ signed: flags.eSigned}) + ")"; }
                        return "";
                }
        );

        var realRE = integerRE + decimalRE;
        // allow for decimals without integers, e.g. .25
        if(decimalRE){realRE = "(?:(?:"+ realRE + ")|(?:" + decimalRE + "))";}
        return realRE + exponentRE; // String
};

/*=====
number.__IntegerRegexpFlags = declare(null, {
        // signed: Boolean?
        //              The leading plus-or-minus sign. Can be true, false, or `[true,false]`.
        //              Default is `[true, false]`, (i.e. will match if it is signed
        //              or unsigned).
        // separator: String?
        //              The character used as the thousands separator. Default is no
        //              separator. For more than one symbol use an array, e.g. `[",", ""]`,
        //              makes ',' optional.
        // groupSize: Number?
        //              group size between separators
        // groupSize2: Number?
        //              second grouping, where separators 2..n have a different interval than the first separator (for India)
});
=====*/

number._integerRegexp = function(/*number.__IntegerRegexpFlags?*/ flags){
        // summary:
        //              Builds a regular expression that matches an integer

        // assign default values to missing parameters
        flags = flags || {};
        if(!("signed" in flags)){ flags.signed = [true, false]; }
        if(!("separator" in flags)){
                flags.separator = "";
        }else if(!("groupSize" in flags)){
                flags.groupSize = 3;
        }

        var signRE = dregexp.buildGroupRE(flags.signed,
                function(q){ return q ? "[-+]" : ""; },
                true
        );

        var numberRE = dregexp.buildGroupRE(flags.separator,
                function(sep){
                        if(!sep){
                                return "(?:\\d+)";
                        }

                        sep = dregexp.escapeString(sep);
                        if(sep == " "){ sep = "\\s"; }
                        else if(sep == "\xa0"){ sep = "\\s\\xa0"; }

                        var grp = flags.groupSize, grp2 = flags.groupSize2;
                        //TODO: should we continue to enforce that numbers with separators begin with 1-9?  See #6933
                        if(grp2){
                                var grp2RE = "(?:0|[1-9]\\d{0," + (grp2-1) + "}(?:[" + sep + "]\\d{" + grp2 + "})*[" + sep + "]\\d{" + grp + "})";
                                return ((grp-grp2) > 0) ? "(?:" + grp2RE + "|(?:0|[1-9]\\d{0," + (grp-1) + "}))" : grp2RE;
                        }
                        return "(?:0|[1-9]\\d{0," + (grp-1) + "}(?:[" + sep + "]\\d{" + grp + "})*)";
                },
                true
        );

        return signRE + numberRE; // String
};

return number;
});