Add basic implementation of Form\Schema.

Add the basic implementation and test cases for the schema class that
ORM-less forms will use.

src/Form/Schema.php

@@ -0,0 +1,51 @@
+<?php
+/**
+ * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
+ * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
+ *
+ * Licensed under The MIT License
+ * For full copyright and license information, please see the LICENSE.txt
+ * Redistributions of files must retain the above copyright notice.
+ *
+ * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
+ * @link          http://cakephp.org CakePHP(tm) Project
+ * @since         3.0.0
+ * @license       http://www.opensource.org/licenses/mit-license.php MIT License
+ */
+namespace Cake\Form;
+
+/**
+ * Contains the schema information for Form instances.
+ */
+class Schema {
+
+	protected $_fields = [];
+
+	protected $_fieldDefaults = [
+		'type' => null,
+		'length' => null,
+		'required' => false,
+	];
+
+	public function addField($name, $attrs) {
+		$attrs = array_intersect_key($attrs, $this->_fieldDefaults);
+		$this->_fields[$name] = $attrs + $this->_fieldDefaults;
+		return $this;
+	}
+
+	public function removeField($name) {
+		unset($this->_fields[$name]);
+		return $this;
+	}
+
+	public function fields() {
+		return array_keys($this->_fields);
+	}
+
+	public function field($name) {
+		if (!isset($this->_fields[$name])) {
+			return null;
+		}
+		return $this->_fields[$name];
+	}
+}

tests/TestCase/Form/SchemaTest.php

@@ -0,0 +1,72 @@
+<?php
+/**
+ * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
+ * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
+ *
+ * Licensed under The MIT License
+ * For full copyright and license information, please see the LICENSE.txt
+ * Redistributions of files must retain the above copyright notice.
+ *
+ * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
+ * @link          http://cakephp.org CakePHP(tm) Project
+ * @since         3.0.0
+ * @license       http://www.opensource.org/licenses/mit-license.php MIT License
+ */
+namespace Cake\Test\TestCase\Form;
+
+use Cake\Form\Schema;
+use Cake\TestSuite\TestCase;
+
+/**
+ * Form schema test case.
+ */
+class SchemaTest extends TestCase {
+
+/**
+ * test adding fields.
+ *
+ * @return void
+ */
+	public function testAddingFields() {
+		$schema = new Schema();
+
+		$res = $schema->addField('name', ['type' => 'string']);
+		$this->assertSame($schema, $res, 'Should be chainable');
+
+		$this->assertEquals(['name'], $schema->fields());
+		$res = $schema->field('name');
+		$expected = ['type' => 'string', 'length' => null, 'required' => false];
+		$this->assertEquals($expected, $res);
+	}
+
+/**
+ * test adding field whitelist attrs
+ *
+ * @return void
+ */
+	public function testAddingFieldsWhitelist() {
+		$schema = new Schema();
+
+		$schema->addField('name', ['derp' => 'derp', 'type' => 'string']);
+		$expected = ['type' => 'string', 'length' => null, 'required' => false];
+		$this->assertEquals($expected, $schema->field('name'));
+	}
+
+/**
+ * Test removing fields.
+ *
+ * @return void
+ */
+	public function testRemovingFields() {
+		$schema = new Schema();
+
+		$schema->addField('name', ['type' => 'string']);
+		$this->assertEquals(['name'], $schema->fields());
+
+		$res = $schema->removeField('name');
+		$this->assertSame($schema, $res, 'Should be chainable');
+		$this->assertEquals([], $schema->fields());
+		$this->assertNull($schema->field('name'));
+	}
+
+}