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Filename : dom-element.js
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var domWalk = require("dom-walk")
var dispatchEvent = require("./event/dispatch-event.js")
var addEventListener = require("./event/add-event-listener.js")
var removeEventListener = require("./event/remove-event-listener.js")
var serializeNode = require("./serialize.js")

var htmlns = "http://www.w3.org/1999/xhtml"

module.exports = DOMElement

function DOMElement(tagName, owner, namespace) {
    if (!(this instanceof DOMElement)) {
        return new DOMElement(tagName)
    }

    var ns = namespace === undefined ? htmlns : (namespace || null)

    this.tagName = ns === htmlns ? String(tagName).toUpperCase() : tagName
    this.nodeName = this.tagName
    this.className = ""
    this.dataset = {}
    this.childNodes = []
    this.parentNode = null
    this.style = {}
    this.ownerDocument = owner || null
    this.namespaceURI = ns
    this._attributes = {}

    if (this.tagName === 'INPUT') {
      this.type = 'text'
    }
}

DOMElement.prototype.type = "DOMElement"
DOMElement.prototype.nodeType = 1

DOMElement.prototype.appendChild = function _Element_appendChild(child) {
    if (child.parentNode) {
        child.parentNode.removeChild(child)
    }

    this.childNodes.push(child)
    child.parentNode = this

    return child
}

DOMElement.prototype.replaceChild =
    function _Element_replaceChild(elem, needle) {
        // TODO: Throw NotFoundError if needle.parentNode !== this

        if (elem.parentNode) {
            elem.parentNode.removeChild(elem)
        }

        var index = this.childNodes.indexOf(needle)

        needle.parentNode = null
        this.childNodes[index] = elem
        elem.parentNode = this

        return needle
    }

DOMElement.prototype.removeChild = function _Element_removeChild(elem) {
    // TODO: Throw NotFoundError if elem.parentNode !== this

    var index = this.childNodes.indexOf(elem)
    this.childNodes.splice(index, 1)

    elem.parentNode = null
    return elem
}

DOMElement.prototype.insertBefore =
    function _Element_insertBefore(elem, needle) {
        // TODO: Throw NotFoundError if referenceElement is a dom node
        // and parentNode !== this

        if (elem.parentNode) {
            elem.parentNode.removeChild(elem)
        }

        var index = needle === null || needle === undefined ?
            -1 :
            this.childNodes.indexOf(needle)

        if (index > -1) {
            this.childNodes.splice(index, 0, elem)
        } else {
            this.childNodes.push(elem)
        }

        elem.parentNode = this
        return elem
    }

DOMElement.prototype.setAttributeNS =
    function _Element_setAttributeNS(namespace, name, value) {
        var prefix = null
        var localName = name
        var colonPosition = name.indexOf(":")
        if (colonPosition > -1) {
            prefix = name.substr(0, colonPosition)
            localName = name.substr(colonPosition + 1)
        }
        if (this.tagName === 'INPUT' && name === 'type') {
          this.type = value;
        }
        else {
          var attributes = this._attributes[namespace] || (this._attributes[namespace] = {})
          attributes[localName] = {value: value, prefix: prefix}
        }
    }

DOMElement.prototype.getAttributeNS =
    function _Element_getAttributeNS(namespace, name) {
        var attributes = this._attributes[namespace];
        var value = attributes && attributes[name] && attributes[name].value
        if (this.tagName === 'INPUT' && name === 'type') {
          return this.type;
        }
        if (typeof value !== "string") {
            return null
        }
        return value
    }

DOMElement.prototype.removeAttributeNS =
    function _Element_removeAttributeNS(namespace, name) {
        var attributes = this._attributes[namespace];
        if (attributes) {
            delete attributes[name]
        }
    }

DOMElement.prototype.hasAttributeNS =
    function _Element_hasAttributeNS(namespace, name) {
        var attributes = this._attributes[namespace]
        return !!attributes && name in attributes;
    }

DOMElement.prototype.setAttribute = function _Element_setAttribute(name, value) {
    return this.setAttributeNS(null, name, value)
}

DOMElement.prototype.getAttribute = function _Element_getAttribute(name) {
    return this.getAttributeNS(null, name)
}

DOMElement.prototype.removeAttribute = function _Element_removeAttribute(name) {
    return this.removeAttributeNS(null, name)
}

DOMElement.prototype.hasAttribute = function _Element_hasAttribute(name) {
    return this.hasAttributeNS(null, name)
}

DOMElement.prototype.removeEventListener = removeEventListener
DOMElement.prototype.addEventListener = addEventListener
DOMElement.prototype.dispatchEvent = dispatchEvent

// Un-implemented
DOMElement.prototype.focus = function _Element_focus() {
    return void 0
}

DOMElement.prototype.toString = function _Element_toString() {
    return serializeNode(this)
}

DOMElement.prototype.getElementsByClassName = function _Element_getElementsByClassName(classNames) {
    var classes = classNames.split(" ");
    var elems = []

    domWalk(this, function (node) {
        if (node.nodeType === 1) {
            var nodeClassName = node.className || ""
            var nodeClasses = nodeClassName.split(" ")

            if (classes.every(function (item) {
                return nodeClasses.indexOf(item) !== -1
            })) {
                elems.push(node)
            }
        }
    })

    return elems
}

DOMElement.prototype.getElementsByTagName = function _Element_getElementsByTagName(tagName) {
    tagName = tagName.toLowerCase()
    var elems = []

    domWalk(this.childNodes, function (node) {
        if (node.nodeType === 1 && (tagName === '*' || node.tagName.toLowerCase() === tagName)) {
            elems.push(node)
        }
    })

    return elems
}

DOMElement.prototype.contains = function _Element_contains(element) {
    return domWalk(this, function (node) {
        return element === node
    }) || false
}