[3.1.0] Initial validator implementation for namespaces.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1622 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/ConfigSchema/Validator.php

@@ -0,0 +1,51 @@
+<?php
+
+/**
+ * Performs validations on HTMLPurifier_ConfigSchema_Interchange
+ */
+class HTMLPurifier_ConfigSchema_Validator
+{
+    
+    protected $interchange;
+    
+    /**
+     * Volatile context variables to provide a fluent interface.
+     */
+    protected $context, $obj, $member;
+    
+    /**
+     * Validates a fully-formed interchange object. Throws an
+     * HTMLPurifier_ConfigSchema_Exception if there's a problem.
+     */
+    public function validate($interchange) {
+        $this->interchange = $interchange;
+        foreach ($interchange->namespaces as $namespace) {
+            $this->validateNamespace($namespace);
+        }
+        foreach ($interchange->directives as $directive) {
+            $this->validateDirective($directive);
+        }
+    }
+    
+    public function validateNamespace($n) {
+        $this->context = "namespace '{$n->namespace}'";
+        $this->with($n, 'namespace')
+            ->assertIsString()
+            ->assertNotEmpty()
+            ->assertAlnum();
+        $this->with($n, 'description')
+            ->assertIsString()
+            ->assertNotEmpty();
+    }
+    
+    public function validateDirective($d) {
+        $this->context = "directive '{$d->id}'";
+    }
+    
+    // protected helper functions
+    
+    protected function with($obj, $member) {
+        return new HTMLPurifier_ConfigSchema_ValidatorAtom($this->interchange, $this->context, $obj, $member);
+    }
+    
+}