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var select = require('xpath').select

function findAttr(node, localName, namespace) {
  for (var i = 0; i<node.attributes.length; i++) {
  	var attr = node.attributes[i]

if (attrEqualsExplicitly(attr, localName, namespace) || attrEqualsImplicitly(attr, localName, namespace, node)) {  		  	
  		return attr
  	}
  }
  return null
}

function findFirst(doc, xpath) {  
  var nodes = select(xpath, doc)    
  if (nodes.length==0) throw "could not find xpath " + xpath
  return nodes[0]
}

function attrEqualsExplicitly(attr, localName, namespace) {
	return attr.localName==localName && (attr.namespaceURI==namespace || !namespace)
}

function attrEqualsImplicitly(attr, localName, namespace, node) {
	return attr.localName==localName && ((!attr.namespaceURI && node.namespaceURI==namespace) || !namespace)
}

var xml_special_to_encoded_attribute = {
    '&': '&',
    '<': '<',
    '"': '"',
    '\r': '',
    '\n': '
',
    '\t': '	'
}

var xml_special_to_encoded_text = {
    '&': '&',
    '<': '<',
    '>': '>',
    '\r': ''
}

function encodeSpecialCharactersInAttribute(attributeValue){
    return attributeValue
        .replace(/([&<"\r\n\t])/g, function(str, item){
            // Special character normalization. See:
            // - https://www.w3.org/TR/xml-c14n#ProcessingModel (Attribute Nodes)
            // - https://www.w3.org/TR/xml-c14n#Example-Chars
            return xml_special_to_encoded_attribute[item]
        })
}

function encodeSpecialCharactersInText(text){
    return text
        .replace(/([&<>\r])/g, function(str, item){
            // Special character normalization. See:
            // - https://www.w3.org/TR/xml-c14n#ProcessingModel (Text Nodes)
            // - https://www.w3.org/TR/xml-c14n#Example-Chars
            return xml_special_to_encoded_text[item]
        })
}

exports.findAttr = findAttr
exports.findChilds = findChilds
exports.encodeSpecialCharactersInAttribute = encodeSpecialCharactersInAttribute
exports.encodeSpecialCharactersInText = encodeSpecialCharactersInText
exports.findFirst = findFirst