# all files / posthtml-parser/ index.js

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     'use strict';

    var Parser = require('htmlparser2/lib/Parser');

    /**
     * @see https://github.com/fb55/htmlparser2/wiki/Parser-options
     */
    var defaultOptions = {lowerCaseTags: false, lowerCaseAttributeNames: false};

    var defaultDirectives = [{name: '!doctype', start: '<', end: '>'}];

    /**
     * Parse html to PostHTMLTree
     * @param  {String} html
     * @param  {Object} [options=defaultOptions]
     * @return {PostHTMLTree}
     */
    function postHTMLParser(html, options) {
        var bufArray = [],
            results = [];

        bufArray.last = function() {
            return this[this.length - 1];
        };

        function isDirective(directive, tag) {
            if (directive.name instanceof RegExp) {
                var regex = RegExp(directive.name.source, 'i');

                return regex.test(tag);
            }

            if (tag !== directive.name) {
                return false;
            }

            return true;
        }

        function parserDirective(name, data) {
            var directives = [].concat(defaultDirectives, options.directives || []);
            var last = bufArray.last();

            for (var i = 0; i < directives.length; i++) {
                var directive = directives[i];
                var directiveText = directive.start + data + directive.end;

                name = name.toLowerCase();
                if (isDirective(directive, name)) {
                    if (!last) {
                        results.push(directiveText);
                        return;
                    }

                    last.content || (last.content = []);
                    last.content.push(directiveText);
                }
            }
        }

        function normalizeArributes(attrs) {
            var result = {};
            Object.keys(attrs).forEach(function(key) {
                var obj = {};
                    obj[key] = attrs[key].replace(/&quot;/g, '"');
                Object.assign(result, obj);
            });

            return result;
        }

        var parser = new Parser({
            onprocessinginstruction: parserDirective,
            oncomment: function(data) {
                var comment = '<!--' + data + '-->',
                    last = bufArray.last();

                if (!last) {
                    results.push(comment);
                    return;
                }

                last.content || (last.content = []);
                last.content.push(comment);
            },
            onopentag: function(tag, attrs) {
                var buf = { tag: tag };

                if (Object.keys(attrs).length) {
                    buf.attrs = normalizeArributes(attrs);
                }

                bufArray.push(buf);
            },
            onclosetag: function() {
                var buf = bufArray.pop();

                if (!bufArray.length) {
                    results.push(buf);
                    return;
                }

                var last = bufArray.last();
                if (!Array.isArray(last.content)) {
                    last.content = [];
                }

                last.content.push(buf);
            },
            ontext: function(text) {
                var last = bufArray.last();
                if (!last) {
                    results.push(text);
                    return;
                }

                last.content || (last.content = []);
                last.content.push(text);
            }
        }, options || defaultOptions);

        parser.write(html);
        parser.end();

        return results;
    }

    function parserWrapper() {
        var option;

        function parser(html) {
            var opt = Object.assign({}, defaultOptions, option);
            return postHTMLParser(html, opt);
        }

        if (
          arguments.length === 1 &&
          Boolean(arguments[0]) &&
          arguments[0].constructor.name === 'Object'
        ) {
            option = arguments[0];
            return parser;
        }

        option = arguments[1];
        return parser(arguments[0]);
    }

    module.exports = parserWrapper;
    module.exports.defaultOptions = defaultOptions;
    module.exports.defaultDirectives = defaultDirectives;