08-27-周三_17-09-29

node_modules/cheerio/lib/api/css.js

@@ -0,0 +1,121 @@
+var domEach = require('../utils').domEach,
+    _ = {
+      pick: require('lodash.pick'),
+    };
+
+var toString = Object.prototype.toString;
+
+/**
+ * Set / Get css.
+ *
+ * @param {String|Object} prop
+ * @param {String} val
+ * @return {self}
+ * @api public
+ */
+
+exports.css = function(prop, val) {
+  if (arguments.length === 2 ||
+    // When `prop` is a "plain" object
+    (toString.call(prop) === '[object Object]')) {
+    return domEach(this, function(idx, el) {
+      setCss(el, prop, val, idx);
+    });
+  } else {
+    return getCss(this[0], prop);
+  }
+};
+
+/**
+ * Set styles of all elements.
+ *
+ * @param {String|Object} prop
+ * @param {String} val
+ * @param {Number} idx - optional index within the selection
+ * @return {self}
+ * @api private
+ */
+
+function setCss(el, prop, val, idx) {
+  if ('string' == typeof prop) {
+    var styles = getCss(el);
+    if (typeof val === 'function') {
+      val = val.call(el, idx, styles[prop]);
+    }
+
+    if (val === '') {
+      delete styles[prop];
+    } else if (val != null) {
+      styles[prop] = val;
+    }
+
+    el.attribs.style = stringify(styles);
+  } else if ('object' == typeof prop) {
+    Object.keys(prop).forEach(function(k){
+      setCss(el, k, prop[k]);
+    });
+  }
+}
+
+/**
+ * Get parsed styles of the first element.
+ *
+ * @param {String} prop
+ * @return {Object}
+ * @api private
+ */
+
+function getCss(el, prop) {
+  var styles = parse(el.attribs.style);
+  if (typeof prop === 'string') {
+    return styles[prop];
+  } else if (Array.isArray(prop)) {
+    return _.pick(styles, prop);
+  } else {
+    return styles;
+  }
+}
+
+/**
+ * Stringify `obj` to styles.
+ *
+ * @param {Object} obj
+ * @return {Object}
+ * @api private
+ */
+
+function stringify(obj) {
+  return Object.keys(obj || {})
+    .reduce(function(str, prop){
+      return str += ''
+        + (str ? ' ' : '')
+        + prop
+        + ': '
+        + obj[prop]
+        + ';';
+    }, '');
+}
+
+/**
+ * Parse `styles`.
+ *
+ * @param {String} styles
+ * @return {Object}
+ * @api private
+ */
+
+function parse(styles) {
+  styles = (styles || '').trim();
+
+  if (!styles) return {};
+
+  return styles
+    .split(';')
+    .reduce(function(obj, str){
+      var n = str.indexOf(':');
+      // skip if there is no :, or if it is the first/last character
+      if (n < 1 || n === str.length-1) return obj;
+      obj[str.slice(0,n).trim()] = str.slice(n+1).trim();
+      return obj;
+    }, {});
+}