08-27-周三_17-09-29

node_modules/cheerio/lib/utils.js

@@ -0,0 +1,83 @@
+var parse = require('./parse'),
+    render = require('dom-serializer');
+
+/**
+ * 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) {
+  return parse(render(dom, options), options).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]);
+};