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 * Copyright (c) 2017, 2021, Oracle and/or its affiliates.
 * Copyright (c) 2013, Regents of the University of California
 *
 * All rights reserved.
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 * 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
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package com.oracle.graal.python.test.datatype;

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

import org.junit.*;

public class ListComprehensionTests {

    @Test
    public void simple() {
        String source = "llist = [x*2 for x in range(5)]\n" + //
                        "print(llist)\n";

        assertPrints("[0, 2, 4, 6, 8]\n", source);
    }

    @Test
    public void doubleLoop() {
        String source = "llist = [x+y for x in range(5) for y in range(3)]\n" + //
                        "print(llist)\n";

        assertPrints("[0, 1, 2, 1, 2, 3, 2, 3, 4, 3, 4, 5, 4, 5, 6]\n", source);
    }

    @Test
    public void nestedListComp() {
        String source = "llist = [[x for x in range(5)] for y in range(3)]\n" + //
                        "print(llist)\n";

        assertPrints("[[0, 1, 2, 3, 4], [0, 1, 2, 3, 4], [0, 1, 2, 3, 4]]\n", source);
    }

    @Test
    public void simpleWithLocalTarget() {
        String source = "def foo():\n" + //
                        "    return [x*2 for x in range(5)]\n" + //
                        "print(foo())\n";

        assertPrints("[0, 2, 4, 6, 8]\n", source);
    }

    @Test
    public void doubleLoopWithLocalTarget() {
        String source = "def foo():" + //
                        "    return [x+y for x in range(5) for y in range(3)]\n" + //
                        "print(foo())\n";

        assertPrints("[0, 1, 2, 1, 2, 3, 2, 3, 4, 3, 4, 5, 4, 5, 6]\n", source);
    }

    @Test
    public void dictComp() {
        String source = "n = 3\n" + //
                        "dd = {i:[(i-1)%n,(i+1)%n] for i in range(n)}\n" + //
                        "print(dd)\n";

        assertPrints("{0: [2, 1], 1: [0, 2], 2: [1, 0]}\n", source);
    }

    @Test
    public void unpacking() {
        String source = "dct = {10:1, 20:2,30:3}\n" + //
                        "lst = [a + b for a, b in dct.items()]\n" + //
                        "print(lst)\n";
        assertPrints("[11, 22, 33]\n", source);
    }

}
