src/zepto.js

//     Zepto.js
//     (c) 2010-2012 Thomas Fuchs
//     Zepto.js may be freely distributed under the MIT license.

var Zepto = (function() {
  var undefined, key, $$, classList, emptyArray = [], slice = emptyArray.slice,
    document = window.document,
    elementDisplay = {}, classCache = {},
    getComputedStyle = document.defaultView.getComputedStyle,
    cssNumber = { 'column-count': 1, 'columns': 1, 'font-weight': 1, 'line-height': 1,'opacity': 1, 'z-index': 1, 'zoom': 1 },
    fragmentRE = /^\s*<(\w+)[^>]*>/,
    elementTypes = [1, 9, 11],
    adjacencyOperators = [ 'after', 'prepend', 'before', 'append' ],
    table = document.createElement('table'),
    tableRow = document.createElement('tr'),
    containers = {
      'tr': document.createElement('tbody'),
      'tbody': table, 'thead': table, 'tfoot': table,
      'td': tableRow, 'th': tableRow,
      '*': document.createElement('div')
    },
    readyRE = /complete|loaded|interactive/,
    classSelectorRE = /^\.([\w-]+)$/,
    idSelectorRE = /^#([\w-]+)$/,
    tagSelectorRE = /^[\w-]+$/;

  function isF(value) { return ({}).toString.call(value) == "[object Function]" }
  function isO(value) { return value instanceof Object }
  function isA(value) { return value instanceof Array }
  function likeArray(obj) { return typeof obj.length == 'number' }

  function compact(array) { return array.filter(function(item){ return item !== undefined && item !== null }) }
  function flatten(array) { return array.length > 0 ? [].concat.apply([], array) : array }
  function camelize(str)  { return str.replace(/-+(.)?/g, function(match, chr){ return chr ? chr.toUpperCase() : '' }) }
  function dasherize(str){
    return str.replace(/::/g, '/')
           .replace(/([A-Z]+)([A-Z][a-z])/g, '$1_$2')
           .replace(/([a-z\d])([A-Z])/g, '$1_$2')
           .replace(/_/g, '-')
           .toLowerCase();
  }
  function uniq(array)    { return array.filter(function(item,index,array){ return array.indexOf(item) == index }) }

  function classRE(name){
    return name in classCache ?
      classCache[name] : (classCache[name] = new RegExp('(^|\\s)' + name + '(\\s|$)'));
  }

  function maybeAddPx(name, value) { return (typeof value == "number" && !cssNumber[dasherize(name)]) ? value + "px" : value; }

  function defaultDisplay(nodeName) {
    var element, display;
    if (!elementDisplay[nodeName]) {
      element = document.createElement(nodeName);
      document.body.appendChild(element);
      display = getComputedStyle(element, '').getPropertyValue("display");
      element.parentNode.removeChild(element);
      display == "none" && (display = "block");
      elementDisplay[nodeName] = display;
    }
    return elementDisplay[nodeName];
  }

  function fragment(html, name) {
    if (name === undefined) name = fragmentRE.test(html) && RegExp.$1;
    if (!(name in containers)) name = '*';
    var container = containers[name];
    container.innerHTML = '' + html;
    return slice.call(container.childNodes);
  }

  function Z(dom, selector){
    dom = dom || emptyArray;
    dom.__proto__ = Z.prototype;
    dom.selector = selector || '';
    return dom;
  }

  function $(selector, context){
    if (!selector) return Z();
    if (context !== undefined) return $(context).find(selector);
    else if (isF(selector)) return $(document).ready(selector);
    else if (selector instanceof Z) return selector;
    else {
      var dom;
      if (isA(selector)) dom = compact(selector);
      else if (elementTypes.indexOf(selector.nodeType) >= 0 || selector === window)
        dom = [selector], selector = null;
      else if (fragmentRE.test(selector))
        dom = fragment(selector.trim(), RegExp.$1), selector = null;
      else if (selector.nodeType && selector.nodeType == 3) dom = [selector];
      else dom = $$(document, selector);
      return Z(dom, selector);
    }
  }

  $.extend = function(target){
    slice.call(arguments, 1).forEach(function(source) {
      for (key in source) target[key] = source[key];
    })
    return target;
  }

  $.qsa = $$ = function(element, selector){
    var found;
    return (element === document && idSelectorRE.test(selector)) ?
      ( (found = element.getElementById(RegExp.$1)) ? [found] : emptyArray ) :
      (element.nodeType !== 1 && element.nodeType !== 9) ? emptyArray :
      slice.call(
        classSelectorRE.test(selector) ? element.getElementsByClassName(RegExp.$1) :
        tagSelectorRE.test(selector) ? element.getElementsByTagName(selector) :
        element.querySelectorAll(selector)
      );
  }

  function filtered(nodes, selector){
    return selector === undefined ? $(nodes) : $(nodes).filter(selector);
  }

  function funcArg(context, arg, idx, payload){
   return isF(arg) ? arg.call(context, idx, payload) : arg;
  }

  $.isFunction = isF;
  $.isObject = isO;
  $.isArray = isA;

  $.inArray = function(elem, array, i) {
		return emptyArray.indexOf.call(array, elem, i);
	}

  $.map = function(elements, callback) {
    var value, values = [], i, key;
    if (likeArray(elements))
      for (i = 0; i < elements.length; i++) {
        value = callback(elements[i], i);
        if (value != null) values.push(value);
      }
    else
      for (key in elements) {
        value = callback(elements[key], key);
        if (value != null) values.push(value);
      }
    return flatten(values);
  }

  $.each = function(elements, callback) {
    var i, key;
    if (likeArray(elements))
      for(i = 0; i < elements.length; i++) {
        if(callback.call(elements[i], i, elements[i]) === false) return elements;
      }
    else
      for(key in elements) {
        if(callback.call(elements[key], key, elements[key]) === false) return elements;
      }
    return elements;
  }

  $.fn = {
    forEach: emptyArray.forEach,
    reduce: emptyArray.reduce,
    push: emptyArray.push,
    indexOf: emptyArray.indexOf,
    concat: emptyArray.concat,
    map: function(fn){
      return $.map(this, function(el, i){ return fn.call(el, i, el) });
    },
    slice: function(){
      return $(slice.apply(this, arguments));
    },
    ready: function(callback){
      if (readyRE.test(document.readyState)) callback($);
      else document.addEventListener('DOMContentLoaded', function(){ callback($) }, false);
      return this;
    },
    get: function(idx){ return idx === undefined ? slice.call(this) : this[idx] },
    size: function(){ return this.length },
    remove: function () {
      return this.each(function () {
        if (this.parentNode != null) {
          this.parentNode.removeChild(this);
        }
      });
    },
    each: function(callback){
      this.forEach(function(el, idx){ callback.call(el, idx, el) });
      return this;
    },
    filter: function(selector){
      return $([].filter.call(this, function(element){
        return element.parentNode && $$(element.parentNode, selector).indexOf(element) >= 0;
      }));
    },
    end: function(){
      return this.prevObject || $();
    },
    andSelf:function(){
      return this.add(this.prevObject || $())
    },
    add:function(selector,context){
      return $(uniq(this.concat($(selector,context))));
    },
    is: function(selector){
      return this.length > 0 && $(this[0]).filter(selector).length > 0;
    },
    not: function(selector){
      var nodes=[];
      if (isF(selector) && selector.call !== undefined)
        this.each(function(idx){
          if (!selector.call(this,idx)) nodes.push(this);
        });
      else {
        var excludes = typeof selector == 'string' ? this.filter(selector) :
          (likeArray(selector) && isF(selector.item)) ? slice.call(selector) : $(selector);
        this.forEach(function(el){
          if (excludes.indexOf(el) < 0) nodes.push(el);
        });
      }
      return $(nodes);
    },
    eq: function(idx){
      return idx === -1 ? this.slice(idx) : this.slice(idx, + idx + 1);
    },
    first: function(){ var el = this[0]; return el && !isO(el) ? el : $(el) },
    last: function(){ var el = this[this.length - 1]; return el && !isO(el) ? el : $(el) },
    find: function(selector){
      var result;
      if (this.length == 1) result = $$(this[0], selector);
      else result = this.map(function(){ return $$(this, selector) });
      return $(result);
    },
    closest: function(selector, context){
      var node = this[0], candidates = $$(context || document, selector);
      if (!candidates.length) node = null;
      while (node && candidates.indexOf(node) < 0)
        node = node !== context && node !== document && node.parentNode;
      return $(node);
    },
    parents: function(selector){
      var ancestors = [], nodes = this;
      while (nodes.length > 0)
        nodes = $.map(nodes, function(node){
          if ((node = node.parentNode) && node !== document && ancestors.indexOf(node) < 0) {
            ancestors.push(node);
            return node;
          }
        });
      return filtered(ancestors, selector);
    },
    parent: function(selector){
      return filtered(uniq(this.pluck('parentNode')), selector);
    },
    children: function(selector){
      return filtered(this.map(function(){ return slice.call(this.children) }), selector);
    },
    siblings: function(selector){
      return filtered(this.map(function(i, el){
        return slice.call(el.parentNode.children).filter(function(child){ return child!==el });
      }), selector);
    },
    empty: function(){ return this.each(function(){ this.innerHTML = '' }) },
    pluck: function(property){ return this.map(function(){ return this[property] }) },
    show: function(){
      return this.each(function() {
        this.style.display == "none" && (this.style.display = null);
        if (getComputedStyle(this, '').getPropertyValue("display") == "none") {
          this.style.display = defaultDisplay(this.nodeName)
        }
      })
    },
    replaceWith: function(newContent) {
      return this.each(function() {
        $(this).before(newContent).remove();
      });
    },
    wrap: function(newContent) {
      return this.each(function() {
        $(this).wrapAll($(newContent)[0].cloneNode(false));
      });
    },
    wrapAll: function(newContent) {
      if (this[0]) {
        $(this[0]).before(newContent = $(newContent));
        newContent.append(this);
      }
      return this;
    },
    unwrap: function(){
      this.parent().each(function(){
        $(this).replaceWith($(this).children());
      });
      return this;
    },
    hide: function(){
      return this.css("display", "none")
    },
    toggle: function(setting){
      return (setting === undefined ? this.css("display") == "none" : setting) ? this.show() : this.hide();
    },
    prev: function(){ return $(this.pluck('previousElementSibling')) },
    next: function(){ return $(this.pluck('nextElementSibling')) },
    html: function(html){
      return html === undefined ?
        (this.length > 0 ? this[0].innerHTML : null) :
        this.each(function (idx) {
          var originHtml = this.innerHTML;
          $(this).empty().append( funcArg(this, html, idx, originHtml) );
        });
    },
    text: function(text){
      return text === undefined ?
        (this.length > 0 ? this[0].textContent : null) :
        this.each(function(){ this.textContent = text });
    },
    attr: function(name, value){
      var res;
      return (typeof name == 'string' && value === undefined) ?
        (this.length == 0 ? undefined :
          (name == 'value' && this[0].nodeName == 'INPUT') ? this.val() :
          (!(res = this[0].getAttribute(name)) && name in this[0]) ? this[0][name] : res
        ) :
        this.each(function(idx){
          if (isO(name)) for (key in name) this.setAttribute(key, name[key])
          else this.setAttribute(name, funcArg(this, value, idx, this.getAttribute(name)));
        });
    },
    removeAttr: function(name) {
      return this.each(function() { this.removeAttribute(name); });
    },
    data: function(name, value){
      return this.attr('data-' + name, value);
    },
    val: function(value){
      return (value === undefined) ?
        (this.length > 0 ? this[0].value : undefined) :
        this.each(function(idx){
          this.value = funcArg(this, value, idx, this.value);
        });
    },
    offset: function(){
      if(this.length==0) return null;
      var obj = this[0].getBoundingClientRect();
      return {
        left: obj.left + window.pageXOffset,
        top: obj.top + window.pageYOffset,
        width: obj.width,
        height: obj.height
      };
    },
    css: function(property, value){
      if (value === undefined && typeof property == 'string') {
        return(
          this.length == 0
            ? undefined
            : this[0].style[camelize(property)] || getComputedStyle(this[0], '').getPropertyValue(property)
        );
      }
      var css = '';
      for (key in property) css += dasherize(key) + ':' + maybeAddPx(key, property[key]) + ';';
      if (typeof property == 'string') css = dasherize(property) + ":" + maybeAddPx(property, value);
      return this.each(function() { this.style.cssText += ';' + css });
    },
    index: function(element){
      return element ? this.indexOf($(element)[0]) : this.parent().children().indexOf(this[0]);
    },
    hasClass: function(name){
      if (this.length < 1) return false;
      else return classRE(name).test(this[0].className);
    },
    addClass: function(name){
      return this.each(function(idx) {
        classList = [];
        var cls = this.className, newName = funcArg(this, name, idx, cls);
        newName.split(/\s+/g).forEach(function(klass) {
          if (!$(this).hasClass(klass)) {
            classList.push(klass)
          }
        }, this);
        classList.length && (this.className += (cls ? " " : "") + classList.join(" "))
      });
    },
    removeClass: function(name){
      return this.each(function(idx) {
        if(name === undefined)
          return this.className = '';
        classList = this.className;
        funcArg(this, name, idx, classList).split(/\s+/g).forEach(function(klass) {
          classList = classList.replace(classRE(klass), " ")
        });
        this.className = classList.trim()
      });
    },
    toggleClass: function(name, when){
      return this.each(function(idx){
        var newName = funcArg(this, name, idx, this.className);
        (when === undefined ? !$(this).hasClass(newName) : when) ?
          $(this).addClass(newName) : $(this).removeClass(newName);
      });
    }
  };

  'filter,add,not,eq,first,last,find,closest,parents,parent,children,siblings'.split(',').forEach(function(property){
    var fn = $.fn[property];
    $.fn[property] = function() {
      var ret = fn.apply(this, arguments);
      ret.prevObject = this;
      return ret;
    }
  });

  ['width', 'height'].forEach(function(dimension){
    $.fn[dimension] = function(value) {
      var offset, Dimension = dimension.replace(/./, function(m) { return m[0].toUpperCase() });
      if (value === undefined) return this[0] == window ? window['inner' + Dimension] :
        this[0] == document ? document.documentElement['offset' + Dimension] :
        (offset = this.offset()) && offset[dimension];
      else return this.each(function(idx){
        var el = $(this);
        el.css(dimension, funcArg(this, value, idx, el[dimension]()));
      });
    }
  });

  function insert(operator, target, node) {
    var parent = (operator % 2) ? target : target.parentNode;
    parent && parent.insertBefore(node,
      !operator ? target.nextSibling :      // after
      operator == 1 ? parent.firstChild :   // prepend
      operator == 2 ? target :              // before
      null);                                // append
  }

  function traverseNode (node, fun) {
    fun(node);
    for (var key in node.childNodes) {
      traverseNode(node.childNodes[key], fun);
    }
  }

  adjacencyOperators.forEach(function(key, operator) {
    $.fn[key] = function(html){
      var nodes = isO(html) ? html : fragment(html);
      if (!('length' in nodes) || nodes.nodeType) nodes = [nodes];
      if (nodes.length < 1) return this;
      var size = this.length, copyByClone = size > 1, inReverse = operator < 2;

      return this.each(function(index, target){
        for (var i = 0; i < nodes.length; i++) {
          var node = nodes[inReverse ? nodes.length-i-1 : i];
          traverseNode(node, function (node) {
            if (node.nodeName != null && node.nodeName.toUpperCase() === 'SCRIPT' && (!node.type || node.type === 'text/javascript')) {
              window['eval'].call(window, node.innerHTML);
            }
          });
          if (copyByClone && index < size - 1) node = node.cloneNode(true);
          insert(operator, target, node);
        }
      });
    };

    var reverseKey = (operator % 2) ? key+'To' : 'insert'+(operator ? 'Before' : 'After');
    $.fn[reverseKey] = function(html) {
      $(html)[key](this);
      return this;
    };
  });

  Z.prototype = $.fn;

  return $;
})();

window.Zepto = Zepto;
'$' in window || (window.$ = Zepto);