Add alt of area[href] and input[type=image] rule

src/rules/alt-not-empty.js

@@ -0,0 +1,34 @@
+/**
+ * Copyright (c) 2013, Yanis Wang <yanis.wang@gmail.com>
+ * Copyright (c) 2014, Takeshi Kurosawa <taken.spc@gmail.com>
+ * MIT Licensed
+ */
+HTMLHint.addRule({
+    id: 'alt-not-empty',
+    description: 'Alt of input[type=image], area[href] must set value.',
+    init: function(parser, reporter){
+        var self = this;
+        parser.addListener('tagstart', function(event){
+            var tagName = event.tagName.toLowerCase(),
+                attrs = event.attrs,
+                attrMap = {},
+                attr,
+                col = event.col + tagName.length + 1,
+                selector;
+            if (tagName !== 'area' && tagName !== 'input'){
+                return;
+            }
+            for(var i=0, l=attrs.length;i<l;i++){
+                attr = attrs[i];
+                attrMap[attr.name.toLowerCase()] = attr.value;
+            }
+            if ((tagName === 'area' && 'href' in attrMap) ||
+                (tagName === 'input' && attrMap['type'] === 'image')) {
+                selector = tagName === 'area' ? 'area[href]' : 'input[type=image]';
+                if (!('alt' in attrMap) || attrMap['alt'] === '') {
+                    reporter.warn('Alt of ' + tagName + ' must be set value.', event.line, col, self, event.raw);
+                }
+            }
+        });
+    }
+});

test/rules/alt-not-empty.js

@@ -0,0 +1,94 @@
+/**
+ * Copyright (c) 2013, Yanis Wang <yanis.wang@gmail.com>
+ * Copyright (c) 2014, Takeshi Kurosawa <taken.spc@gmail.com>
+ * MIT Licensed
+ */
+
+var expect  = require("expect.js");
+
+var HTMLHint  = require("../../index").HTMLHint;
+
+var ruldId = 'alt-not-empty',
+    ruleOptions = {};
+
+ruleOptions[ruldId] = true;
+
+describe('Rules: '+ruldId, function(){
+
+    /* A tag can have shape and coords attributes and not have alt attribute */
+    it('A tag have not alt attribute should not result in an error', function(){
+        var code = '<a>';
+        var messages = HTMLHint.verify(code, ruleOptions);
+        expect(messages.length).to.be(0);
+    });
+
+    it('Area tag have not href and alt attribute should not result in an error', function(){
+        var code = '<area>';
+        var messages = HTMLHint.verify(code, ruleOptions);
+        expect(messages.length).to.be(0);
+    });
+
+    it('Area[href] tag have not alt attribute should result in an error', function(){
+        var code = '<area href="#test">';
+        var messages = HTMLHint.verify(code, ruleOptions);
+        expect(messages.length).to.be(1);
+        expect(messages[0].rule.id).to.be(ruldId);
+        expect(messages[0].line).to.be(1);
+        expect(messages[0].col).to.be(6);
+        expect(messages[0].type).to.be('warning');
+    });
+
+    it('Area[href] tag have empty alt attribute should result in an error', function(){
+        var code = '<area href="#test" alt="">';
+        var messages = HTMLHint.verify(code, ruleOptions);
+        expect(messages.length).to.be(1);
+        expect(messages[0].rule.id).to.be(ruldId);
+        expect(messages[0].line).to.be(1);
+        expect(messages[0].col).to.be(6);
+        expect(messages[0].type).to.be('warning');
+    });
+
+    it('Area[href] tag have non emtpy alt attribute should not result in an error', function(){
+        var code = '<area href="#test" alt="test">';
+        var messages = HTMLHint.verify(code, ruleOptions);
+        expect(messages.length).to.be(0);
+    });
+
+    it('Input tag have not type and alt attribute should not result in an error', function(){
+        var code = '<input>';
+        var messages = HTMLHint.verify(code, ruleOptions);
+        expect(messages.length).to.be(0);
+    });
+
+    it('Input[type="text"] tag have not alt attribute should not result in an error', function(){
+        var code = '<input type="text">';
+        var messages = HTMLHint.verify(code, ruleOptions);
+        expect(messages.length).to.be(0);
+    });
+
+    it('Input[type="image"] tag have not alt attribute should result in an error', function(){
+        var code = '<input type="image">';
+        var messages = HTMLHint.verify(code, ruleOptions);
+        expect(messages.length).to.be(1);
+        expect(messages[0].rule.id).to.be(ruldId);
+        expect(messages[0].line).to.be(1);
+        expect(messages[0].col).to.be(7);
+        expect(messages[0].type).to.be('warning');
+    });
+
+    it('Input[type="image"] tag have empty alt attribute should result in an error', function(){
+        var code = '<input type="image" alt="">';
+        var messages = HTMLHint.verify(code, ruleOptions);
+        expect(messages.length).to.be(1);
+        expect(messages[0].rule.id).to.be(ruldId);
+        expect(messages[0].line).to.be(1);
+        expect(messages[0].col).to.be(7);
+        expect(messages[0].type).to.be('warning');
+    });
+
+    it('Input[type="image"] tag have non emtpy alt attribute should not result in an error', function(){
+        var code = '<input type="image" alt="test">';
+        var messages = HTMLHint.verify(code, ruleOptions);
+        expect(messages.length).to.be(0);
+    });
+});