intl-relativeformat - npm Package Compare versions

Comparing version 1.0.0-beta-1 to 1.0.0-beta-2

bower.json

@@ -29,4 +29,5 @@ {
     "es6",
+    "commonjs",
     "globals"
   ]
 }

dist/intl-relativeformat.min.js

@@ -1,1 +0,1 @@
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\\t\\n\\r,.+={}#]"},L="{",M={type:"literal",value:"{",description:'"{"'},N=null,O=",",P={type:"literal",value:",",description:'","'},Q="}",R={type:"literal",value:"}",description:'"}"'},S=function(a,b){return{type:"argumentElement",id:a,format:b&&b[2]}},T="number",U={type:"literal",value:"number",description:'"number"'},V="date",W={type:"literal",value:"date",description:'"date"'},X="time",Y={type:"literal",value:"time",description:'"time"'},Z=function(a,b){return{type:a+"Format",style:b&&b[2]}},$="plural",_={type:"literal",value:"plural",description:'"plural"'},ab=function(a,b){return{type:"pluralFormat",offset:a||0,options:b}},bb="select",cb={type:"literal",value:"select",description:'"select"'},db=function(a){return{type:"selectFormat",options:a}},eb="=",fb={type:"literal",value:"=",description:'"="'},gb=function(a,b){return{type:"optionalFormatPattern",selector:a,value:b}},hb="offset:",ib={type:"literal",value:"offset:",description:'"offset:"'},jb=function(a){return a},kb={type:"other",description:"whitespace"},lb=/^[ \t\n\r]/,mb={type:"class",value:"[ \\t\\n\\r]",description:"[ \\t\\n\\r]"},nb={type:"other",description:"optionalWhitespace"},ob=/^[0-9]/,pb={type:"class",value:"[0-9]",description:"[0-9]"},qb=/^[0-9a-f]/i,rb={type:"class",value:"[0-9a-f]i",description:"[0-9a-f]i"},sb="0",tb={type:"literal",value:"0",description:'"0"'},ub=/^[1-9]/,vb={type:"class",value:"[1-9]",description:"[1-9]"},wb=function(a){return parseInt(a,10)},xb=/^[^{}\\\0-\x1F \t\n\r]/,yb={type:"class",value:"[^{}\\\\\\0-\\x1F \\t\\n\\r]",description:"[^{}\\\\\\0-\\x1F \\t\\n\\r]"},zb="\\#",Ab={type:"literal",value:"\\#",description:'"\\\\#"'},Bb=function(){return"\\#"},Cb="\\{",Db={type:"literal",value:"\\{",description:'"\\\\{"'},Eb=function(){return"{"},Fb="\\}",Gb={type:"literal",value:"\\}",description:'"\\\\}"'},Hb=function(){return"}"},Ib="\\u",Jb={type:"literal",value:"\\u",description:'"\\\\u"'},Kb=function(a){return String.fromCharCode(parseInt(a,16))},Lb=function(a){return a.join("")},Mb=0,Nb=0,Ob=0,Pb={line:1,column:1,seenCR:!1},Qb=0,Rb=[],Sb=0;if("startRule"in B){if(!(B.startRule in D))throw new Error("Can't start parsing from rule \""+B.startRule+'".');E=D[B.startRule]}if(A=E(),A!==C&&Mb===a.length)return A;throw A!==C&&Mb<a.length&&d({type:"end",description:"end of input"}),e(null,Rb,Qb)}return a(b,Error),{SyntaxError:b,parse:c}}(),t=g;p(g,"formats",{enumerable:!0,value:{number:{currency:{style:"currency"},percent:{style:"percent"}},date:{"short":{month:"numeric",day:"numeric",year:"2-digit"},medium:{month:"short",day:"numeric",year:"numeric"},"long":{month:"long",day:"numeric",year:"numeric"},full:{weekday:"long",month:"long",day:"numeric",year:"numeric"}},time:{"short":{hour:"numeric",minute:"numeric"},medium:{hour:"numeric",minute:"numeric",second:"numeric"},"long":{hour:"numeric",minute:"numeric",second:"numeric",timeZoneName:"short"},full:{hour:"numeric",minute:"numeric",second:"numeric",timeZoneName:"short"}}}}),p(g,"__availableLocales__",{value:[]}),p(g,"__localeData__",{value:q(null)}),p(g,"__addLocaleData",{value:function(a){if(!a||!a.locale)throw new Error("Locale data does not contain a `locale` property");if(!a.pluralRuleFunction)throw new Error("Locale data does not contain a `pluralRuleFunction` property");var b=g.__availableLocales__,c=g.__localeData__;b.push(a.locale),c[a.locale]=a}}),p(g,"__parse",{value:s.parse}),p(g,"defaultLocale",{enumerable:!0,writable:!0,value:void 0}),g.prototype.resolvedOptions=function(){return{locale:this._locale}},g.prototype._compilePattern=function(a,b,c,d){var e=new r(b,c,d);return e.compile(a)},g.prototype._format=function(a,b){var c,d,e,f,g,h="";for(c=0,d=a.length;d>c;c+=1)if(e=a[c],"string"!=typeof e){if(f=e.id,!b||!n.call(b,f))throw new Error("A value must be provided for: "+f);g=b[f],h+=e.options?this._format(e.getOption(g),b):e.format(g)}else h+=e;return h},g.prototype._mergeFormats=function(b,c){var d,e,f={};for(d in b)n.call(b,d)&&(f[d]=e=q(b[d]),c&&n.call(c,d)&&a(e,c[d]));return f},g.prototype._resolveLocale=function(a){var b,c,d,e=g.__availableLocales__;if(0===e.length)throw new Error("No locale data has been provided for IntlMessageFormat yet");if("string"==typeof a&&(a=[a]),a&&a.length)for(c=0,d=a.length;d>c;c+=1){if(b=a[c].toLowerCase().split("-")[0],!/[a-z]{2,3}/i.test(b))throw new RangeError('"'+a[c]+'" is not a structurally valid language tag');if(e.indexOf(b)>=0)break}return b||g.defaultLocale.split("-")[0]};var u={locale:"en",pluralRuleFunction:function(a){var b=Math.floor(Math.abs(a)),c=a.toString().replace(/^[^.]*\.?/,"").length;return a=Math.floor(a),1===b&&0===c?"one":"other"}};t.__addLocaleData(u),t.defaultLocale="en";var v=t,w=Math.round,x=function(a,b){var c=w(b.getTime()-a.getTime()),d=w(c/1e3),e=w(d/60),f=w(e/60),g=w(f/24),i=w(g/7),j=h(g),k=w(12*j),l=w(j);return{millisecond:c,second:d,minute:e,hour:f,day:g,week:i,month:k,year:l}},y=i,z=["second","minute","hour","day","month","year"],A=["best fit","numeric"];l(i,"__availableLocales__",{value:[]}),l(i,"__localeData__",{value:m(null)}),l(i,"__addLocaleData",{value:function(a){if(!a||!a.locale)throw new Error("Locale data provided to IntlRelativeFormat does not contain a `locale` property");if(!a.fields)throw new Error("Locale data provided to IntlRelativeFormat does not contain a `fields` property");v.__addLocaleData(a);var b=i.__availableLocales__,c=i.__localeData__,d=a.locale.toLowerCase().split("-")[0];b.push(d),c[d]=a}}),l(i,"defaultLocale",{enumerable:!0,writable:!0,value:void 0}),l(i,"thresholds",{enumerable:!0,value:{second:45,minute:45,hour:22,day:26,month:11}}),i.prototype.resolvedOptions=function(){return{locale:this._locale,style:this._options.style,units:this._options.units}},i.prototype._format=function(a){if(a=new Date(a),!a||!a.getTime())throw new TypeError("A Date must be provided to a IntlRelativeFormat instance's `format()` function");var b=x(new Date,a),c=this._options.units||this._selectUnits(b),d=b[c];if("numeric"!==this._options.style){var e=this._resolveRelativeUnits(d,c);if(e)return e}return this._resolveMessage(c).format({0:Math.abs(d),when:0>d?"past":"future"})},i.prototype._isValidUnits=function(a){if(!a||z.indexOf(a)>=0)return!0;if("string"==typeof a){var b=/s$/.test(a)&&a.substr(0,a.length-1);if(b&&z.indexOf(b)>=0)throw new Error('"'+a+'" is not a valid IntlRelativeFormat `units` value, did you mean: '+b)}throw new Error('"'+a+'" is not a valid IntlRelativeFormat `units` value, it must be one of: "'+z.join('", "')+'"')},i.prototype._resolveLocale=function(a){a||(a=i.defaultLocale),"string"==typeof a&&(a=[a]);var b,c,d,e=i.__availableLocales__;for(b=0,c=a.length;c>b;b+=1){if(d=a[b].split("-")[0].toLowerCase(),!/[a-z]{2,3}/.test(d))throw new Error("Language tag provided to IntlRelativeFormat is not structrually valid: "+d);if(e.indexOf(d)>=0)return d}throw new Error("No locale data has been added to IntlRelativeFormat for: "+a.join(", "))},i.prototype._resolveMessage=function(a){var b,c,d,e,f,g,h=this._messages;if(!h[a]){b=i.__localeData__[this._locale].fields[a],c=b.relativeTime,e="",f="";for(d in c.future)c.future.hasOwnProperty(d)&&(e+=" "+d+" {"+c.future[d].replace("{0}","#")+"}");for(d in c.past)c.past.hasOwnProperty(d)&&(f+=" "+d+" {"+c.past[d].replace("{0}","#")+"}");g="{when, select, future {{0, plural, "+e+"}}past {{0, plural, "+f+"}}}",h[a]=new v(g,this._locale)}return h[a]},i.prototype._resolveRelativeUnits=function(a,b){var c=i.__localeData__[this._locale].fields[b];return c.relative?c.relative[a]:void 0},i.prototype._resolveStyle=function(a){if(!a)return A[0];if(A.indexOf(a)>=0)return a;throw new Error('"'+a+'" is not a valid IntlRelativeFormat `style` value, it must be one of: "'+A.join('", "')+'"')},i.prototype._selectUnits=function(a){var b,c,d;for(b=0,c=z.length;c>b&&(d=z[b],!(Math.abs(a[d])<i.thresholds[d]));b+=1);return d};var B={locale:"en",pluralRuleFunction:function(a){var b=Math.floor(Math.abs(a)),c=a.toString().replace(/^[^.]*\.?/,"").length;return a=Math.floor(a),1===b&&0===c?"one":"other"},fields:{second:{displayName:"Second",relative:{0:"now"},relativeTime:{future:{one:"in {0} second",other:"in {0} seconds"},past:{one:"{0} second ago",other:"{0} seconds ago"}}},minute:{displayName:"Minute",relativeTime:{future:{one:"in {0} minute",other:"in {0} minutes"},past:{one:"{0} minute ago",other:"{0} minutes ago"}}},hour:{displayName:"Hour",relativeTime:{future:{one:"in {0} hour",other:"in {0} hours"},past:{one:"{0} hour ago",other:"{0} hours ago"}}},day:{displayName:"Day",relative:{0:"today",1:"tomorrow","-1":"yesterday"},relativeTime:{future:{one:"in {0} day",other:"in {0} days"},past:{one:"{0} day ago",other:"{0} days ago"}}},month:{displayName:"Month",relative:{0:"this month",1:"next month","-1":"last month"},relativeTime:{future:{one:"in {0} month",other:"in {0} months"},past:{one:"{0} month ago",other:"{0} months ago"}}},year:{displayName:"Year",relative:{0:"this year",1:"next year","-1":"last year"},relativeTime:{future:{one:"in {0} year",other:"in {0} years"},past:{one:"{0} year ago",other:"{0} years ago"}}}}};y.__addLocaleData(B),y.defaultLocale="en";var C=y;this.IntlRelativeFormat=C}).call(this);

lib/core.js

@@ -16,3 +16,4 @@ "use strict";
 
-var priority = ['second', 'minute', 'hour', 'day', 'month', 'year'];
+var FIELDS = ['second', 'minute', 'hour', 'day', 'month', 'year'];
+var STYLES = ['best fit', 'numeric'];
 
@@ -22,3 +23,10 @@ // -- RelativeFormat --------------------------------------------------------
 function RelativeFormat(locales, options) {
+    options = options || {};
+
     src$es5$$.defineProperty(this, '_locale', {value: this._resolveLocale(locales)});
+    src$es5$$.defineProperty(this, '_options', {value: {
+        style: this._resolveStyle(options.style),
+        units: this._isValidUnits(options.units) && options.units
+    }});
+
     src$es5$$.defineProperty(this, '_messages', {value: src$es5$$.objCreate(null)});
@@ -29,3 +37,3 @@
     var relativeFormat = this;
-    this.format = function (date) {
+    this.format = function format(date) {
         return relativeFormat._format(date);
@@ -40,7 +48,13 @@ };
     if (!(data && data.locale)) {
-        throw new Error('Locale data does not contain a `locale` property');
+        throw new Error(
+            'Locale data provided to IntlRelativeFormat does not contain a ' +
+            '`locale` property'
+        );
     }
 
     if (!data.fields) {
-        throw new Error('Locale data does not contain a `fields` property');
+        throw new Error(
+            'Locale data provided to IntlRelativeFormat does not contain a ' +
+            '`fields` property'
+        );
     }
@@ -85,5 +99,6 @@
 RelativeFormat.prototype.resolvedOptions = function () {
-    // TODO: Provide anything else?
     return {
-        locale: this._locale
+        locale: this._locale,
+        style : this._options.style,
+        units : this._options.units
     };
@@ -97,30 +112,89 @@ };
     if (!(date && date.getTime())) {
-        throw new TypeError('A date must be provided.');
+        throw new TypeError(
+            'A Date must be provided to a IntlRelativeFormat instance\'s ' +
+            '`format()` function'
+        );
     }
 
-    var d = src$diff$$.default(new Date(), date),
-        key, msg, i, l;
+    var diffReport  = src$diff$$.default(new Date(), date);
+    var units       = this._options.units || this._selectUnits(diffReport);
+    var diffInUnits = diffReport[units];
 
-    for (i = 0, l = priority.length; i < l; i++) {
-        key = priority[i];
-        if (d[key] < RelativeFormat.thresholds[key]) {
-            break;
+    if (this._options.style !== 'numeric') {
+        var relativeUnits = this._resolveRelativeUnits(diffInUnits, units);
+        if (relativeUnits) {
+            return relativeUnits;
         }
     }
 
-    msg = this._resolveMessage(key);
-
-    return msg.format({
-        '0' : d[key],
-        when: d.duration < 0 ? 'past' : 'future'
+    return this._resolveMessage(units).format({
+        '0' : Math.abs(diffInUnits),
+        when: diffInUnits < 0 ? 'past' : 'future'
     });
 };
 
-RelativeFormat.prototype._resolveMessage = function (key) {
-    var messages = this._messages,
-        field, relativeTime, i, future, past;
+RelativeFormat.prototype._isValidUnits = function (units) {
+    if (!units || FIELDS.indexOf(units) >= 0) {
+        return true;
+    }
 
+    if (typeof units === 'string') {
+        var suggestion = /s$/.test(units) && units.substr(0, units.length - 1);
+        if (suggestion && FIELDS.indexOf(suggestion) >= 0) {
+            throw new Error(
+                '"' + units + '" is not a valid IntlRelativeFormat `units` ' +
+                'value, did you mean: ' + suggestion
+            );
+        }
+    }
+
+    throw new Error(
+        '"' + units + '" is not a valid IntlRelativeFormat `units` value, it ' +
+        'must be one of: "' + FIELDS.join('", "') + '"'
+    );
+};
+
+RelativeFormat.prototype._resolveLocale = function (locales) {
+    if (!locales) {
+        locales = RelativeFormat.defaultLocale;
+    }
+
+    if (typeof locales === 'string') {
+        locales = [locales];
+    }
+
+    var availableLocales = RelativeFormat.__availableLocales__;
+    var i, len, locale;
+
+    for (i = 0, len = locales.length; i < len; i += 1) {
+        // We just need the root part of the langage tag.
+        locale = locales[i].split('-')[0].toLowerCase();
+
+        // Validate that the langage tag is structurally valid.
+        if (!/[a-z]{2,3}/.test(locale)) {
+            throw new Error(
+                'Language tag provided to IntlRelativeFormat is not ' +
+                'structrually valid: ' + locale
+            );
+        }
+
+        // Return the first locale for which we have CLDR data registered.
+        if (availableLocales.indexOf(locale) >= 0) {
+            return locale;
+        }
+    }
+
+    throw new Error(
+        'No locale data has been added to IntlRelativeFormat for: ' +
+        locales.join(', ')
+    );
+};
+
+RelativeFormat.prototype._resolveMessage = function (units) {
+    var messages = this._messages;
+    var field, relativeTime, i, future, past, message;
+
     // Create a new synthetic message based on the locale data from CLDR.
-    if (!messages[key]) {
-        field        = RelativeFormat.__localeData__[this._locale].fields[key];
+    if (!messages[units]) {
+        field        = RelativeFormat.__localeData__[this._locale].fields[units];
         relativeTime = field.relativeTime;
@@ -136,2 +210,3 @@ future       = '';
         }
+
         for (i in relativeTime.past) {
@@ -144,43 +219,49 @@ if (relativeTime.past.hasOwnProperty(i)) {
 
-        messages[key] = new intl$messageformat$$.default(
-            '{when, select, future {{0, plural, ' + future + '}}' +
-                           'past {{0, plural, ' + past + '}}}',
-            this._locale
-        );
+        message = '{when, select, future {{0, plural, ' + future + '}}' +
+                'past {{0, plural, ' + past + '}}}';
+
+        messages[units] = new intl$messageformat$$.default(message, this._locale);
     }
 
-    return messages[key];
+    return messages[units];
 };
 
-RelativeFormat.prototype._resolveLocale = function (locales) {
-    var availableLocales = RelativeFormat.__availableLocales__,
-        locale, parts, i, len;
+RelativeFormat.prototype._resolveRelativeUnits = function (diff, units) {
+    var field = RelativeFormat.__localeData__[this._locale].fields[units];
 
-    if (availableLocales.length === 0) {
-        throw new Error('No locale data has been provided for IntlRelativeFormat yet');
+    if (field.relative) {
+        return field.relative[diff];
     }
+};
 
-    if (typeof locales === 'string') {
-        locales = [locales];
+RelativeFormat.prototype._resolveStyle = function (style) {
+    // Default to "best fit" style.
+    if (!style) {
+        return STYLES[0];
     }
 
-    if (locales && locales.length) {
-        for (i = 0, len = locales.length; i < len; i += 1) {
-            locale = locales[i].toLowerCase().split('-')[0];
+    if (STYLES.indexOf(style) >= 0) {
+        return style;
+    }
 
-            // Make sure the first part of the locale that we care about is
-            // structurally valid.
-            if (!/[a-z]{2,3}/i.test(locale)) {
-                throw new RangeError('"' + locales[i] + '" is not a structurally valid language tag');
-            }
+    throw new Error(
+        '"' + style + '" is not a valid IntlRelativeFormat `style` value, it ' +
+        'must be one of: "' + STYLES.join('", "') + '"'
+    );
+};
 
-            if (availableLocales.indexOf(locale) >= 0) {
-                break;
-            }
+RelativeFormat.prototype._selectUnits = function (diffReport) {
+    var i, l, units;
+
+    for (i = 0, l = FIELDS.length; i < l; i += 1) {
+        units = FIELDS[i];
+
+        if (Math.abs(diffReport[units]) < RelativeFormat.thresholds[units]) {
+            break;
         }
     }
 
-    return locale || RelativeFormat.defaultLocale.split('-')[0];
+    return units;
 };
 
 //# sourceMappingURL=core.js.map

lib/diff.js

@@ -13,5 +13,3 @@ "use strict";
 
-function absRound(number) {
-    return Math[number < 0 ? 'ceil' : 'floor'](number);
-}
+var round = Math.round;
 
@@ -24,21 +22,22 @@ function daysToYears (days) {
 var src$diff$$default = function (dfrom, dto) {
-    var round = Math.round,
-        duration = absRound(dto.getTime() - dfrom.getTime()),
-        ms = Math.abs(duration),
-        ss = round(ms / 1000),
-        mm = round(ss / 60),
-        hh = round(mm / 60),
-        dd = round(hh / 24),
-        ww = round(dd / 7);
+    var millisecond = round(dto.getTime() - dfrom.getTime()),
+        second      = round(millisecond / 1000),
+        minute      = round(second / 60),
+        hour        = round(minute / 60),
+        day         = round(hour / 24),
+        week        = round(day / 7);
 
+    var rawYears = daysToYears(day),
+        month    = round(rawYears * 12),
+        year     = round(rawYears);
+
     return {
-        duration: duration,
-        week: ww,
-        day: dd,
-        hour: hh,
-        minute: mm,
-        second: ss,
-        millisecond: ms,
-        year: round((mm + daysToYears(dd) * 12) / 12),
-        month: round(mm + daysToYears(dd) * 12),
+        millisecond: millisecond,
+        second     : second,
+        minute     : minute,
+        hour       : hour,
+        day        : day,
+        week       : week,
+        month      : month,
+        year       : year
     };
@@ -45,0 +44,0 @@ };

package.json

 {
   "name": "intl-relativeformat",
-  "version": "1.0.0-beta-1",
+  "version": "1.0.0-beta-2",
   "description": "Formats JavaScript dates to relative time strings.",
@@ -5,0 +5,0 @@ "keywords": [

src/core.js

@@ -15,3 +15,4 @@ /*
 
-var priority = ['second', 'minute', 'hour', 'day', 'month', 'year'];
+var FIELDS = ['second', 'minute', 'hour', 'day', 'month', 'year'];
+var STYLES = ['best fit', 'numeric'];
 
@@ -21,3 +22,10 @@ // -- RelativeFormat --------------------------------------------------------
 function RelativeFormat(locales, options) {
+    options = options || {};
+
     defineProperty(this, '_locale', {value: this._resolveLocale(locales)});
+    defineProperty(this, '_options', {value: {
+        style: this._resolveStyle(options.style),
+        units: this._isValidUnits(options.units) && options.units
+    }});
+
     defineProperty(this, '_messages', {value: objCreate(null)});
@@ -28,3 +36,3 @@
     var relativeFormat = this;
-    this.format = function (date) {
+    this.format = function format(date) {
         return relativeFormat._format(date);
@@ -39,7 +47,13 @@ };
     if (!(data && data.locale)) {
-        throw new Error('Locale data does not contain a `locale` property');
+        throw new Error(
+            'Locale data provided to IntlRelativeFormat does not contain a ' +
+            '`locale` property'
+        );
     }
 
     if (!data.fields) {
-        throw new Error('Locale data does not contain a `fields` property');
+        throw new Error(
+            'Locale data provided to IntlRelativeFormat does not contain a ' +
+            '`fields` property'
+        );
     }
@@ -84,5 +98,6 @@
 RelativeFormat.prototype.resolvedOptions = function () {
-    // TODO: Provide anything else?
     return {
-        locale: this._locale
+        locale: this._locale,
+        style : this._options.style,
+        units : this._options.units
     };
@@ -96,30 +111,89 @@ };
     if (!(date && date.getTime())) {
-        throw new TypeError('A date must be provided.');
+        throw new TypeError(
+            'A Date must be provided to a IntlRelativeFormat instance\'s ' +
+            '`format()` function'
+        );
     }
 
-    var d = diff(new Date(), date),
-        key, msg, i, l;
+    var diffReport  = diff(new Date(), date);
+    var units       = this._options.units || this._selectUnits(diffReport);
+    var diffInUnits = diffReport[units];
 
-    for (i = 0, l = priority.length; i < l; i++) {
-        key = priority[i];
-        if (d[key] < RelativeFormat.thresholds[key]) {
-            break;
+    if (this._options.style !== 'numeric') {
+        var relativeUnits = this._resolveRelativeUnits(diffInUnits, units);
+        if (relativeUnits) {
+            return relativeUnits;
         }
     }
 
-    msg = this._resolveMessage(key);
-
-    return msg.format({
-        '0' : d[key],
-        when: d.duration < 0 ? 'past' : 'future'
+    return this._resolveMessage(units).format({
+        '0' : Math.abs(diffInUnits),
+        when: diffInUnits < 0 ? 'past' : 'future'
     });
 };
 
-RelativeFormat.prototype._resolveMessage = function (key) {
-    var messages = this._messages,
-        field, relativeTime, i, future, past;
+RelativeFormat.prototype._isValidUnits = function (units) {
+    if (!units || FIELDS.indexOf(units) >= 0) {
+        return true;
+    }
 
+    if (typeof units === 'string') {
+        var suggestion = /s$/.test(units) && units.substr(0, units.length - 1);
+        if (suggestion && FIELDS.indexOf(suggestion) >= 0) {
+            throw new Error(
+                '"' + units + '" is not a valid IntlRelativeFormat `units` ' +
+                'value, did you mean: ' + suggestion
+            );
+        }
+    }
+
+    throw new Error(
+        '"' + units + '" is not a valid IntlRelativeFormat `units` value, it ' +
+        'must be one of: "' + FIELDS.join('", "') + '"'
+    );
+};
+
+RelativeFormat.prototype._resolveLocale = function (locales) {
+    if (!locales) {
+        locales = RelativeFormat.defaultLocale;
+    }
+
+    if (typeof locales === 'string') {
+        locales = [locales];
+    }
+
+    var availableLocales = RelativeFormat.__availableLocales__;
+    var i, len, locale;
+
+    for (i = 0, len = locales.length; i < len; i += 1) {
+        // We just need the root part of the langage tag.
+        locale = locales[i].split('-')[0].toLowerCase();
+
+        // Validate that the langage tag is structurally valid.
+        if (!/[a-z]{2,3}/.test(locale)) {
+            throw new Error(
+                'Language tag provided to IntlRelativeFormat is not ' +
+                'structrually valid: ' + locale
+            );
+        }
+
+        // Return the first locale for which we have CLDR data registered.
+        if (availableLocales.indexOf(locale) >= 0) {
+            return locale;
+        }
+    }
+
+    throw new Error(
+        'No locale data has been added to IntlRelativeFormat for: ' +
+        locales.join(', ')
+    );
+};
+
+RelativeFormat.prototype._resolveMessage = function (units) {
+    var messages = this._messages;
+    var field, relativeTime, i, future, past, message;
+
     // Create a new synthetic message based on the locale data from CLDR.
-    if (!messages[key]) {
-        field        = RelativeFormat.__localeData__[this._locale].fields[key];
+    if (!messages[units]) {
+        field        = RelativeFormat.__localeData__[this._locale].fields[units];
         relativeTime = field.relativeTime;
@@ -135,2 +209,3 @@ future       = '';
         }
+
         for (i in relativeTime.past) {
@@ -143,41 +218,47 @@ if (relativeTime.past.hasOwnProperty(i)) {
 
-        messages[key] = new IntlMessageFormat(
-            '{when, select, future {{0, plural, ' + future + '}}' +
-                           'past {{0, plural, ' + past + '}}}',
-            this._locale
-        );
+        message = '{when, select, future {{0, plural, ' + future + '}}' +
+                'past {{0, plural, ' + past + '}}}';
+
+        messages[units] = new IntlMessageFormat(message, this._locale);
     }
 
-    return messages[key];
+    return messages[units];
 };
 
-RelativeFormat.prototype._resolveLocale = function (locales) {
-    var availableLocales = RelativeFormat.__availableLocales__,
-        locale, parts, i, len;
+RelativeFormat.prototype._resolveRelativeUnits = function (diff, units) {
+    var field = RelativeFormat.__localeData__[this._locale].fields[units];
 
-    if (availableLocales.length === 0) {
-        throw new Error('No locale data has been provided for IntlRelativeFormat yet');
+    if (field.relative) {
+        return field.relative[diff];
     }
+};
 
-    if (typeof locales === 'string') {
-        locales = [locales];
+RelativeFormat.prototype._resolveStyle = function (style) {
+    // Default to "best fit" style.
+    if (!style) {
+        return STYLES[0];
     }
 
-    if (locales && locales.length) {
-        for (i = 0, len = locales.length; i < len; i += 1) {
-            locale = locales[i].toLowerCase().split('-')[0];
+    if (STYLES.indexOf(style) >= 0) {
+        return style;
+    }
 
-            // Make sure the first part of the locale that we care about is
-            // structurally valid.
-            if (!/[a-z]{2,3}/i.test(locale)) {
-                throw new RangeError('"' + locales[i] + '" is not a structurally valid language tag');
-            }
+    throw new Error(
+        '"' + style + '" is not a valid IntlRelativeFormat `style` value, it ' +
+        'must be one of: "' + STYLES.join('", "') + '"'
+    );
+};
 
-            if (availableLocales.indexOf(locale) >= 0) {
-                break;
-            }
+RelativeFormat.prototype._selectUnits = function (diffReport) {
+    var i, l, units;
+
+    for (i = 0, l = FIELDS.length; i < l; i += 1) {
+        units = FIELDS[i];
+
+        if (Math.abs(diffReport[units]) < RelativeFormat.thresholds[units]) {
+            break;
         }
     }
 
-    return locale || RelativeFormat.defaultLocale.split('-')[0];
+    return units;
 };

src/diff.js

@@ -9,5 +9,3 @@ /*
 
-function absRound(number) {
-    return Math[number < 0 ? 'ceil' : 'floor'](number);
-}
+var round = Math.round;
 
@@ -20,22 +18,23 @@ function daysToYears (days) {
 export default function (dfrom, dto) {
-    var round = Math.round,
-        duration = absRound(dto.getTime() - dfrom.getTime()),
-        ms = Math.abs(duration),
-        ss = round(ms / 1000),
-        mm = round(ss / 60),
-        hh = round(mm / 60),
-        dd = round(hh / 24),
-        ww = round(dd / 7);
+    var millisecond = round(dto.getTime() - dfrom.getTime()),
+        second      = round(millisecond / 1000),
+        minute      = round(second / 60),
+        hour        = round(minute / 60),
+        day         = round(hour / 24),
+        week        = round(day / 7);
 
+    var rawYears = daysToYears(day),
+        month    = round(rawYears * 12),
+        year     = round(rawYears);
+
     return {
-        duration: duration,
-        week: ww,
-        day: dd,
-        hour: hh,
-        minute: mm,
-        second: ss,
-        millisecond: ms,
-        year: round((mm + daysToYears(dd) * 12) / 12),
-        month: round(mm + daysToYears(dd) * 12),
+        millisecond: millisecond,
+        second     : second,
+        minute     : minute,
+        hour       : hour,
+        day        : day,
+        week       : week,
+        month      : month,
+        year       : year
     };
 }

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