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/*
 * Copyright 2003-2008 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package groovy.util

/**
 * Groovy test case, which recreates internal GroovyShell in each setUp ()
 *
 * @author Alex Tkachman
 */
class GroovyShellTestCase extends GroovyTestCase {

    @Delegate protected GroovyShell shell

    protected void setUp() {
        super.setUp();
        shell = createNewShell();
    }

    protected void tearDown() {
        shell = null;
        super.tearDown();
    }

    /**
     * Create new shell instance.
     * Overwrite it to customize
     */
    protected GroovyShell createNewShell() {
        return new GroovyShell()
    }

    /**
     * Executes closure with given binding
     */
    protected def withBinding (Map map, Closure closure) {
        Binding binding = shell.context
        Map bmap = binding.variables
        try {
            Map vars = new HashMap(bmap)
            bmap.putAll map

            return closure.call()
        }
        finally {
            bmap.clear()
            bmap.putAll vars
        }
    }

    /**
     * Evaluates script with given binding
     */
    protected def withBinding (Map map, String script) {
        Binding binding = shell.context
        Map bmap = binding.variables
        try {
            Map vars = new HashMap(bmap)
            bmap.putAll map

            return evaluate(script)
        }
        finally {
            bmap.clear()
            bmap.putAll vars
        }
    }
}