Webfonts analyzis (#209)

Add 3 new rules about webfonts
2016-12-20 12:16:28 +08:00
parent 9898a8424a
commit 5273dfbbf3
24 changed files with 999 additions and 69 deletions
@@ -0,0 +1,71 @@
+/**
+ * Lists the number of different characters
+ */
+/* global document: true, Node: true, window: true */
+
+exports.version = '1.0';
+
+exports.module = function(phantomas) {
+    'use strict';
+
+    //phantomas.setMetric('differentCharacters'); // @desc the number of different characters in the body @offenders
+
+    phantomas.on('report', function() {
+        phantomas.log("charactersCount: starting to analyze characters on page...");
+
+        phantomas.evaluate(function() {
+            (function(phantomas) {
+
+                phantomas.spyEnabled(false, 'analyzing characters on page');
+
+                function getLetterCount(arr){
+                    return arr.reduce(function(prev, next){
+                        prev[next] = 1;
+                        return prev;
+                    }, {});
+                }
+
+                if (document.body && document.body.textContent) {
+                    var allText = '';
+
+                    // Traverse all DOM Tree to read text
+                    var runner = new phantomas.nodeRunner();
+                    runner.walk(document.body, function(node, depth) {
+                        switch (node.nodeType) {
+
+                            // Grabing text nodes
+                            case Node.TEXT_NODE:
+                                if (node.parentNode.tagName !== 'SCRIPT' && node.parentNode.tagName !== 'STYLE') {
+                                    allText += node.nodeValue;
+                                }
+                                break;
+
+                            // Grabing CSS content properties
+                            case Node.ELEMENT_NODE:
+                                if (node.tagName !== 'SCRIPT' && node.tagName !== 'STYLE') {
+                                    allText += window.getComputedStyle(node).getPropertyValue('content');
+                                    allText += window.getComputedStyle(node, ':before').getPropertyValue('content');
+                                    allText += window.getComputedStyle(node, ':after').getPropertyValue('content');
+                                }
+                                break;
+                        }
+                    });
+
+                    // Reduce all text found in page into a string of unique chars
+                    var charactersList = getLetterCount(allText.split(''));
+                    var charsetString = Object.keys(charactersList).sort().join('');
+                    
+                    // Remove blank characters
+                    charsetString = charsetString.replace(/\s/g, '');
+
+                    phantomas.setMetric('differentCharacters', charsetString.length);
+                    phantomas.addOffender('differentCharacters', charsetString);
+                }
+
+                phantomas.spyEnabled(true);
+            }(window.__phantomas));
+        });
+
+        phantomas.log("charactersCount: analyzing characters done.");
+    });
+};