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var parse = require('./parse'),
render = require('dom-serializer'),
assign = require('lodash/assign');
/**
* HTML Tags
*/
var tags = { tag: true, script: true, style: true };
/**
* Check if the DOM element is a tag
*
* isTag(type) includes <script> and <style> tags
*/
exports.isTag = function(type) {
if (type.type) type = type.type;
return tags[type] || false;
};
/**
* Convert a string to camel case notation.
* @param {String} str String to be converted.
* @return {String} String in camel case notation.
*/
exports.camelCase = function(str) {
return str.replace(/[_.-](\w|$)/g, function(_, x) {
return x.toUpperCase();
});
};
/**
* Convert a string from camel case to "CSS case", where word boundaries are
* described by hyphens ("-") and all characters are lower-case.
* @param {String} str String to be converted.
* @return {string} String in "CSS case".
*/
exports.cssCase = function(str) {
return str.replace(/[A-Z]/g, '-$&').toLowerCase();
};
/**
* Iterate over each DOM element without creating intermediary Cheerio instances.
*
* This is indented for use internally to avoid otherwise unnecessary memory pressure introduced
* by _make.
*/
exports.domEach = function(cheerio, fn) {
var i = 0, len = cheerio.length;
while (i < len && fn.call(cheerio, i, cheerio[i]) !== false) ++i;
return cheerio;
};
/**
* Create a deep copy of the given DOM structure by first rendering it to a
* string and then parsing the resultant markup.
*
* @argument {Object} dom - The htmlparser2-compliant DOM structure
* @argument {Object} options - The parsing/rendering options
*/
exports.cloneDom = function(dom, options) {
options = assign({}, options, { _useHtmlParser2: true });
return parse(render(dom, options), options, false).children;
};
/*
* A simple way to check for HTML strings or ID strings
*/
var quickExpr = /^(?:[^#<]*(<[\w\W]+>)[^>]*$|#([\w\-]*)$)/;
/*
* Check if string is HTML
*/
exports.isHtml = function(str) {
// Faster than running regex, if str starts with `<` and ends with `>`, assume it's HTML
if (str.charAt(0) === '<' && str.charAt(str.length - 1) === '>' && str.length >= 3) return true;
// Run the regex
var match = quickExpr.exec(str);
return !!(match && match[1]);
};
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