Add string attribute operators

Author: eush77

README.md

@@ -29,12 +29,12 @@ select(ast, 'paragraph emphasis > text')
 - [x] Adjacent sibling selectors: `paragraph + text`
 - [x] Group selectors: `paragraph, text`
 - [x] Universal selector: `*`
-- [ ] Attribute selectors: `text[value*="substr"]`
+- [x] Attribute selectors: `text[value*="substr"]`
   - [x] Existence: `[value]`
   - [x] Equality: `[value="foo"]`
-  - [ ] Begins with: `[value^="prefix"]`
-  - [ ] Containment: `[value*="substr"]`
-  - [ ] Ends with: `[value$="suffix"]`
+  - [x] Begins with: `[value^="prefix"]`
+  - [x] Containment: `[value*="substr"]`
+  - [x] Ends with: `[value$="suffix"]`
 
 ## API
 

lib/select.js

@@ -106,6 +106,18 @@ function matches (rule, node) {
         }
         return node[attr.name] == attr.value;
 
+      case '^=':
+        return typeof node[attr.name] == 'string' &&
+          node[attr.name].slice(0, attr.value.length) == attr.value;
+
+      case '*=':
+        return typeof node[attr.name] == 'string' &&
+          node[attr.name].indexOf(attr.value) >= 0;
+
+      case '$=':
+        return typeof node[attr.name] == 'string' &&
+          node[attr.name].slice(-attr.value.length) == attr.value;
+
       default:
         throw Error('Undefined attribute operator: ' + attr.operator);
     }

lib/selector.js

@@ -6,5 +6,6 @@ var Parser = require('css-selector-parser').CssSelectorParser;
 module.exports = function SelectorParser () {
   var parser = new Parser;
   parser.registerNestingOperators('>', '+', '~');
+  parser.registerAttrEqualityMods('^', '*', '$');
   return parser.parse.bind(parser);
 };

test/test.js

@@ -117,5 +117,11 @@ test('attribute selectors', function (t) {
   t.deepEqual(select(ast, '[ordered=true]'), [ast.children[6]]);
   t.deepEqual(select(ast, 'list[loose=false]'), select(ast, 'list'));
 
+  t.comment('string operators');
+  t.deepEqual(select(ast, '[link^="http://"]'), select(ast, 'definition'));
+  t.deepEqual(select(ast, '[value*=reduce]'),
+              select(ast, 'root > code[lang=js]'));
+  t.deepEqual(select(ast, '[type$=Cell]'), select(ast, 'tableCell'));
+
   t.end();
 });