/*
 * Copyright (c) 2017, 2022, Oracle and/or its affiliates.
 * Copyright (c) 2013, Regents of the University of California
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 * conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided
 * with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.oracle.graal.python.test.generator;

import static com.oracle.graal.python.test.PythonTests.assertPrints;

import org.junit.Test;

public class GeneratorTests {

    @Test
    public void simpleLoop() {
        String source = "def loopgen(n):\n" + //
                        "    for i in range(n):\n" + //
                        "        yield i\n" + //
                        "\n" + //
                        "for i in loopgen(5):\n" + //
                        "    print(i)\n";

        assertPrints("0\n1\n2\n3\n4\n", source);
    }

    @Test
    public void specialIter() {
        String source = "class Foo:\n" + //
                        "    def __init__(self, n):\n" + //
                        "        self.n = n\n" + //
                        "    def __iter__(self):\n" + //
                        "        return (i for i in range(self.n))\n" + //
                        "for i in Foo(5):\n" + //
                        "    print(i)\n";

        assertPrints("0\n1\n2\n3\n4\n", source);
    }

    @Test
    public void desugared() {
        String source = "def gen(n):\n" + //
                        "    for i in range(n):\n" + //
                        "        yield i\n" + //
                        "g = gen(5)\n" + //
                        "try:\n" + //
                        "    while True:\n" + //
                        "       print(g.__next__())\n" + //
                        "except StopIteration:\n" + //
                        "    pass\n";

        assertPrints("0\n1\n2\n3\n4\n", source);
    }

    @Test
    public void testYieldFrom() {
        String source = "def gen1():\n" +
                        "    yield 1\n" +
                        "    yield 2\n" +
                        "\n" +
                        "def gen2():\n" +
                        "    yield from gen1()\n" +
                        "\n" +
                        "print(list(gen2()))\n";
        assertPrints("[1, 2]\n", source);
    }
}
