// Regexps to match html elements

'use strict';

var attrName     = '[a-zA-Z_:][a-zA-Z0-9:._-]*';

var unquoted      = '[^"\'=<>`\\x00-\\x20]+';
var singleQuoted = "'[^']*'";
var doubleQuoted = '"[^"]*"';

var attrValue  = '(?:' + unquoted + '|' + singleQuoted + '|' + doubleQuoted + ')';

var attribute   = '(?:\\s+' + attrName + '(?:\\s*=\\s*' + attrValue + ')?)';

var openTag    = '<[A-Za-z][A-Za-z0-9\\-]*' + attribute + '*\\s*\\/?>';

var closeTag   = '<\\/[A-Za-z][A-Za-z0-9\\-]*\\s*>';
var comment     = '<!---->|<!--(?:-?[^>-])(?:-?[^-])*-->';
var processing  = '<[?].*?[?]>';
var declaration = '<![A-Z]+\\s+[^>]*>';
var cdata       = '<!\\[CDATA\\[[\\s\\S]*?\\]\\]>';

var HTML_TAG_RE = new RegExp('^(?:' + openTag + '|' + closeTag + '|' + comment +
                        '|' + processing + '|' + declaration + '|' + cdata + ')');
var HTML_OPEN_CLOSE_TAG_RE = new RegExp('^(?:' + openTag + '|' + closeTag + ')');

module.exports.HTML_TAG_RE = HTML_TAG_RE;
module.exports.HTML_OPEN_CLOSE_TAG_RE = HTML_OPEN_CLOSE_TAG_RE;