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