package prog8tests

import org.hamcrest.MatcherAssert.assertThat
import org.hamcrest.Matchers.closeTo
import org.hamcrest.Matchers.equalTo
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.TestInstance
import prog8.ast.base.DataType
import prog8.ast.base.ErrorReporter
import prog8.ast.base.Position
import prog8.ast.expressions.NumericLiteralValue
import prog8.ast.expressions.StringLiteralValue
import prog8.compiler.*
import prog8.compiler.target.c64.C64MachineDefinition.C64Zeropage
import prog8.compiler.target.c64.C64MachineDefinition.FLOAT_MAX_NEGATIVE
import prog8.compiler.target.c64.C64MachineDefinition.FLOAT_MAX_POSITIVE
import prog8.compiler.target.c64.C64MachineDefinition.Mflpt5
import prog8.compiler.target.c64.Petscii
import java.io.CharConversionException
import kotlin.test.*

@TestInstance(TestInstance.Lifecycle.PER_CLASS)
class TestCompiler {
    @Test
    fun testToHex() {
        assertEquals("0", 0.toHex())
        assertEquals("1", 1.toHex())
        assertEquals("1", 1.234.toHex())
        assertEquals("10", 10.toHex())
        assertEquals("10", 10.99.toHex())
        assertEquals("15", 15.toHex())
        assertEquals("\$10", 16.toHex())
        assertEquals("\$ff", 255.toHex())
        assertEquals("\$0100", 256.toHex())
        assertEquals("\$4e5c", 20060.toHex())
        assertEquals("\$c382", 50050.toHex())
        assertEquals("\$ffff", 65535.toHex())
        assertEquals("\$ffff", 65535L.toHex())
        assertEquals("0", 0.toHex())
        assertEquals("-1", (-1).toHex())
        assertEquals("-1", (-1.234).toHex())
        assertEquals("-10", (-10).toHex())
        assertEquals("-10", (-10.99).toHex())
        assertEquals("-15", (-15).toHex())
        assertEquals("-\$10", (-16).toHex())
        assertEquals("-\$ff", (-255).toHex())
        assertEquals("-\$0100", (-256).toHex())
        assertEquals("-\$4e5c", (-20060).toHex())
        assertEquals("-\$c382", (-50050).toHex())
        assertEquals("-\$ffff", (-65535).toHex())
        assertEquals("-\$ffff", (-65535L).toHex())
        assertFailsWith<CompilerException> { 65536.toHex()  }
        assertFailsWith<CompilerException> { 65536L.toHex()  }
    }

    @Test
    fun testFloatToMflpt5() {
        assertThat(Mflpt5.fromNumber(0), equalTo(Mflpt5(0x00, 0x00, 0x00, 0x00, 0x00)))
        assertThat(Mflpt5.fromNumber(3.141592653), equalTo(Mflpt5(0x82, 0x49, 0x0F, 0xDA, 0xA1)))
        assertThat(Mflpt5.fromNumber(3.141592653589793), equalTo(Mflpt5(0x82, 0x49, 0x0F, 0xDA, 0xA2)))
        assertThat(Mflpt5.fromNumber(32768), equalTo(Mflpt5(0x90, 0x00, 0x00, 0x00, 0x00)))
        assertThat(Mflpt5.fromNumber(-32768), equalTo(Mflpt5(0x90, 0x80, 0x00, 0x00, 0x00)))
        assertThat(Mflpt5.fromNumber(1), equalTo(Mflpt5(0x81, 0x00, 0x00, 0x00, 0x00)))
        assertThat(Mflpt5.fromNumber(0.7071067812), equalTo(Mflpt5(0x80, 0x35, 0x04, 0xF3, 0x34)))
        assertThat(Mflpt5.fromNumber(0.7071067811865476), equalTo(Mflpt5(0x80, 0x35, 0x04, 0xF3, 0x33)))
        assertThat(Mflpt5.fromNumber(1.4142135624), equalTo(Mflpt5(0x81, 0x35, 0x04, 0xF3, 0x34)))
        assertThat(Mflpt5.fromNumber(1.4142135623730951), equalTo(Mflpt5(0x81, 0x35, 0x04, 0xF3, 0x33)))
        assertThat(Mflpt5.fromNumber(-.5), equalTo(Mflpt5(0x80, 0x80, 0x00, 0x00, 0x00)))
        assertThat(Mflpt5.fromNumber(0.69314718061), equalTo(Mflpt5(0x80, 0x31, 0x72, 0x17, 0xF8)))
        assertThat(Mflpt5.fromNumber(0.6931471805599453), equalTo(Mflpt5(0x80, 0x31, 0x72, 0x17, 0xF7)))
        assertThat(Mflpt5.fromNumber(10), equalTo(Mflpt5(0x84, 0x20, 0x00, 0x00, 0x00)))
        assertThat(Mflpt5.fromNumber(1000000000), equalTo(Mflpt5(0x9E, 0x6E, 0x6B, 0x28, 0x00)))
        assertThat(Mflpt5.fromNumber(.5), equalTo(Mflpt5(0x80, 0x00, 0x00, 0x00, 0x00)))
        assertThat(Mflpt5.fromNumber(1.4426950408889634), equalTo(Mflpt5(0x81, 0x38, 0xAA, 0x3B, 0x29)))
        assertThat(Mflpt5.fromNumber(1.5707963267948966), equalTo(Mflpt5(0x81, 0x49, 0x0F, 0xDA, 0xA2)))
        assertThat(Mflpt5.fromNumber(6.283185307179586), equalTo(Mflpt5(0x83, 0x49, 0x0F, 0xDA, 0xA2)))
        assertThat(Mflpt5.fromNumber(.25), equalTo(Mflpt5(0x7F, 0x00, 0x00, 0x00, 0x00)))
        assertThat(Mflpt5.fromNumber(123.45678e22), equalTo(Mflpt5(0xd1, 0x02, 0xb7, 0x06, 0xfb)))
        assertThat(Mflpt5.fromNumber(-123.45678e-22), equalTo(Mflpt5(0x3e, 0xe9, 0x34, 0x09, 0x1b)))
    }

    @Test
    fun testFloatRange() {
        assertThat(Mflpt5.fromNumber(FLOAT_MAX_POSITIVE), equalTo(Mflpt5(0xff, 0x7f, 0xff, 0xff, 0xff)))
        assertThat(Mflpt5.fromNumber(FLOAT_MAX_NEGATIVE), equalTo(Mflpt5(0xff, 0xff, 0xff, 0xff, 0xff)))
        assertThat(Mflpt5.fromNumber(1.7e-38), equalTo(Mflpt5(0x03, 0x39, 0x1d, 0x15, 0x63)))
        assertThat(Mflpt5.fromNumber(1.7e-39), equalTo(Mflpt5(0x00, 0x00, 0x00, 0x00, 0x00)))
        assertThat(Mflpt5.fromNumber(-1.7e-38), equalTo(Mflpt5(0x03, 0xb9, 0x1d, 0x15, 0x63)))
        assertThat(Mflpt5.fromNumber(-1.7e-39), equalTo(Mflpt5(0x00, 0x00, 0x00, 0x00, 0x00)))
        assertFailsWith<CompilerException> { Mflpt5.fromNumber(1.7014118346e+38) }
        assertFailsWith<CompilerException> { Mflpt5.fromNumber(-1.7014118346e+38) }
        assertFailsWith<CompilerException> { Mflpt5.fromNumber(1.7014118347e+38) }
        assertFailsWith<CompilerException> { Mflpt5.fromNumber(-1.7014118347e+38) }
    }

    @Test
    fun testMflpt5ToFloat() {
        val epsilon=0.000000001
        assertThat(Mflpt5(0x00, 0x00, 0x00, 0x00, 0x00).toDouble(), equalTo(0.0))
        assertThat(Mflpt5(0x82, 0x49, 0x0F, 0xDA, 0xA1).toDouble(), closeTo(3.141592653, epsilon))
        assertThat(Mflpt5(0x82, 0x49, 0x0F, 0xDA, 0xA2).toDouble(), closeTo(3.141592653589793, epsilon))
        assertThat(Mflpt5(0x90, 0x00, 0x00, 0x00, 0x00).toDouble(), equalTo(32768.0))
        assertThat(Mflpt5(0x90, 0x80, 0x00, 0x00, 0x00).toDouble(), equalTo(-32768.0))
        assertThat(Mflpt5(0x81, 0x00, 0x00, 0x00, 0x00).toDouble(), equalTo(1.0))
        assertThat(Mflpt5(0x80, 0x35, 0x04, 0xF3, 0x34).toDouble(), closeTo(0.7071067812, epsilon))
        assertThat(Mflpt5(0x80, 0x35, 0x04, 0xF3, 0x33).toDouble(), closeTo(0.7071067811865476, epsilon))
        assertThat(Mflpt5(0x81, 0x35, 0x04, 0xF3, 0x34).toDouble(), closeTo(1.4142135624, epsilon))
        assertThat(Mflpt5(0x81, 0x35, 0x04, 0xF3, 0x33).toDouble(), closeTo(1.4142135623730951, epsilon))
        assertThat(Mflpt5(0x80, 0x80, 0x00, 0x00, 0x00).toDouble(), equalTo(-.5))
        assertThat(Mflpt5(0x80, 0x31, 0x72, 0x17, 0xF8).toDouble(), closeTo(0.69314718061, epsilon))
        assertThat(Mflpt5(0x80, 0x31, 0x72, 0x17, 0xF7).toDouble(), closeTo(0.6931471805599453, epsilon))
        assertThat(Mflpt5(0x84, 0x20, 0x00, 0x00, 0x00).toDouble(), equalTo(10.0))
        assertThat(Mflpt5(0x9E, 0x6E, 0x6B, 0x28, 0x00).toDouble(), equalTo(1000000000.0))
        assertThat(Mflpt5(0x80, 0x00, 0x00, 0x00, 0x00).toDouble(), equalTo(.5))
        assertThat(Mflpt5(0x81, 0x38, 0xAA, 0x3B, 0x29).toDouble(), closeTo(1.4426950408889634, epsilon))
        assertThat(Mflpt5(0x81, 0x49, 0x0F, 0xDA, 0xA2).toDouble(), closeTo(1.5707963267948966, epsilon))
        assertThat(Mflpt5(0x83, 0x49, 0x0F, 0xDA, 0xA2).toDouble(), closeTo(6.283185307179586, epsilon))
        assertThat(Mflpt5(0x7F, 0x00, 0x00, 0x00, 0x00).toDouble(), equalTo(.25))
        assertThat(Mflpt5(0xd1, 0x02, 0xb7, 0x06, 0xfb).toDouble(), closeTo(123.45678e22, 1.0e15))
        assertThat(Mflpt5(0x3e, 0xe9, 0x34, 0x09, 0x1b).toDouble(), closeTo(-123.45678e-22, epsilon))
    }
}


@TestInstance(TestInstance.Lifecycle.PER_CLASS)
class TestC64Zeropage {

    private val errors = ErrorReporter()

    @Test
    fun testNames() {
        val zp = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.BASICSAFE, emptyList(), false, "c64"))

        zp.allocate("", DataType.UBYTE, null, errors)
        zp.allocate("", DataType.UBYTE, null, errors)
        zp.allocate("varname", DataType.UBYTE, null, errors)
        assertFailsWith<AssertionError> {
            zp.allocate("varname", DataType.UBYTE, null, errors)
        }
        zp.allocate("varname2", DataType.UBYTE, null, errors)
    }

    @Test
    fun testZpFloatEnable() {
        val zp = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FULL, emptyList(), false, "c64"))
        assertFailsWith<CompilerException> {
            zp.allocate("", DataType.FLOAT, null, errors)
        }
        val zp2 = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.DONTUSE, emptyList(), true, "c64"))
        assertFailsWith<CompilerException> {
            zp2.allocate("", DataType.FLOAT, null, errors)
        }
        val zp3 = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FLOATSAFE, emptyList(), true, "c64"))
        zp3.allocate("", DataType.FLOAT, null, errors)
    }

    @Test
    fun testZpModesWithFloats() {
        C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FULL, emptyList(), false, "c64"))
        C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.KERNALSAFE, emptyList(), false, "c64"))
        C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.BASICSAFE, emptyList(), false, "c64"))
        C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FLOATSAFE, emptyList(), false, "c64"))
        C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.BASICSAFE, emptyList(), true, "c64"))
        C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FLOATSAFE, emptyList(), true, "c64"))
        assertFailsWith<CompilerException> {
            C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FULL, emptyList(), true, "c64"))
        }
        assertFailsWith<CompilerException> {
            C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.KERNALSAFE, emptyList(), true, "c64"))
        }
    }

    @Test
    fun testZpDontuse() {
        val zp = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.DONTUSE, emptyList(), false, "c64"))
        println(zp.free)
        assertEquals(0, zp.available())
        assertFailsWith<CompilerException> {
            zp.allocate("", DataType.BYTE, null, errors)
        }
    }

    @Test
    fun testFreeSpaces() {
        val zp1 = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.BASICSAFE, emptyList(), true, "c64"))
        assertEquals(16, zp1.available())
        val zp2 = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FLOATSAFE, emptyList(), false, "c64"))
        assertEquals(91, zp2.available())
        val zp3 = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.KERNALSAFE, emptyList(), false, "c64"))
        assertEquals(125, zp3.available())
        val zp4 = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FULL, emptyList(), false, "c64"))
        assertEquals(238, zp4.available())
    }

    @Test
    fun testReservedSpace() {
        val zp1 = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FULL, emptyList(), false, "c64"))
        assertEquals(238, zp1.available())
        assertTrue(50 in zp1.free)
        assertTrue(100 in zp1.free)
        assertTrue(49 in zp1.free)
        assertTrue(101 in zp1.free)
        assertTrue(200 in zp1.free)
        assertTrue(255 in zp1.free)
        assertTrue(199 in zp1.free)
        val zp2 = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FULL, listOf(50 .. 100, 200..255), false, "c64"))
        assertEquals(139, zp2.available())
        assertFalse(50 in zp2.free)
        assertFalse(100 in zp2.free)
        assertTrue(49 in zp2.free)
        assertTrue(101 in zp2.free)
        assertFalse(200 in zp2.free)
        assertFalse(255 in zp2.free)
        assertTrue(199 in zp2.free)
    }

    @Test
    fun testBasicsafeAllocation() {
        val zp = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.BASICSAFE, emptyList(), true, "c64"))
        assertEquals(16, zp.available())

        assertFailsWith<ZeropageDepletedError> {
            // in regular zp there aren't 5 sequential bytes free
            zp.allocate("", DataType.FLOAT, null, errors)
        }

        for (i in 0 until zp.available()) {
            val loc = zp.allocate("", DataType.UBYTE, null, errors)
            assertTrue(loc > 0)
        }
        assertEquals(0, zp.available())
        assertFailsWith<ZeropageDepletedError> {
            zp.allocate("", DataType.UBYTE, null, errors)
        }
        assertFailsWith<ZeropageDepletedError> {
            zp.allocate("", DataType.UWORD, null, errors)
        }
    }

    @Test
    fun testFullAllocation() {
        val zp = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FULL, emptyList(), false, "c64"))
        assertEquals(238, zp.available())
        val loc = zp.allocate("", DataType.UWORD, null, errors)
        assertTrue(loc > 3)
        assertFalse(loc in zp.free)
        val num = zp.available() / 2

        for(i in 0..num-4) {
            zp.allocate("", DataType.UWORD, null, errors)
        }
        assertEquals(6,zp.available())

        assertFailsWith<ZeropageDepletedError> {
            // can't allocate because no more sequential bytes, only fragmented
            zp.allocate("", DataType.UWORD, null, errors)
        }

        for(i in 0..5) {
            zp.allocate("", DataType.UBYTE, null, errors)
        }

        assertEquals(0, zp.available())
        assertFailsWith<ZeropageDepletedError> {
            // no more space
            zp.allocate("", DataType.UBYTE, null, errors)
        }
    }

    @Test
    fun testEfficientAllocation() {
        val zp = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.BASICSAFE, emptyList(),  true, "c64"))
        assertEquals(16, zp.available())
        assertEquals(0x04, zp.allocate("", DataType.WORD, null, errors))
        assertEquals(0x06, zp.allocate("", DataType.UBYTE, null, errors))
        assertEquals(0x0a, zp.allocate("", DataType.UBYTE, null, errors))
        assertEquals(0x94, zp.allocate("", DataType.UWORD, null, errors))
        assertEquals(0xa7, zp.allocate("", DataType.UWORD, null, errors))
        assertEquals(0xa9, zp.allocate("", DataType.UWORD, null, errors))
        assertEquals(0xb5, zp.allocate("", DataType.UWORD, null, errors))
        assertEquals(0xf7, zp.allocate("", DataType.UWORD, null, errors))
        assertEquals(0x0e, zp.allocate("", DataType.UBYTE, null, errors))
        assertEquals(0xf9, zp.allocate("", DataType.UBYTE, null, errors))
        assertEquals(0, zp.available())
    }
}


@TestInstance(TestInstance.Lifecycle.PER_CLASS)
class TestPetscii {

    @Test
    fun testZero() {
        assertThat(Petscii.encodePetscii("\u0000", true), equalTo(listOf<Short>(0)))
        assertThat(Petscii.encodePetscii("\u0000", false), equalTo(listOf<Short>(0)))
        assertThat(Petscii.decodePetscii(listOf(0), true), equalTo("\u0000"))
        assertThat(Petscii.decodePetscii(listOf(0), false), equalTo("\u0000"))
    }

    @Test
    fun testLowercase() {
        assertThat(Petscii.encodePetscii("hello WORLD 123 @!£", true), equalTo(
                listOf<Short>(72, 69, 76, 76, 79, 32, 0xd7, 0xcf, 0xd2, 0xcc, 0xc4, 32, 49, 50, 51, 32, 64, 33, 0x5c)))
        assertThat(Petscii.encodePetscii("\uf11a", true), equalTo(listOf<Short>(0x12)))   // reverse vid
        assertThat(Petscii.encodePetscii("✓", true), equalTo(listOf<Short>(0xfa)))
        assertFailsWith<CharConversionException> { Petscii.encodePetscii("π", true) }
        assertFailsWith<CharConversionException> { Petscii.encodePetscii("♥", true) }

        assertThat(Petscii.decodePetscii(listOf(72, 0xd7, 0x5c, 0xfa, 0x12), true), equalTo("hW£✓\uF11A"))
        assertFailsWith<ArrayIndexOutOfBoundsException> { Petscii.decodePetscii(listOf(-1), true) }
        assertFailsWith<ArrayIndexOutOfBoundsException> { Petscii.decodePetscii(listOf(256), true) }
    }

    @Test
    fun testUppercase() {
        assertThat(Petscii.encodePetscii("HELLO 123 @!£"), equalTo(
                listOf<Short>(72, 69, 76, 76, 79, 32, 49, 50, 51, 32, 64, 33, 0x5c)))
        assertThat(Petscii.encodePetscii("\uf11a"), equalTo(listOf<Short>(0x12)))   // reverse vid
        assertThat(Petscii.encodePetscii("♥"), equalTo(listOf<Short>(0xd3)))
        assertThat(Petscii.encodePetscii("π"), equalTo(listOf<Short>(0xff)))
        assertFailsWith<CharConversionException> { Petscii.encodePetscii("✓") }

        assertThat(Petscii.decodePetscii(listOf(72, 0x5c, 0xd3, 0xff)), equalTo("H£♥π"))
        assertFailsWith<ArrayIndexOutOfBoundsException> { Petscii.decodePetscii(listOf(-1)) }
        assertFailsWith<ArrayIndexOutOfBoundsException> { Petscii.decodePetscii(listOf(256)) }
    }

    @Test
    fun testScreencodeLowercase() {
        assertThat(Petscii.encodeScreencode("hello WORLD 123 @!£", true), equalTo(
                listOf<Short>(0x08, 0x05, 0x0c, 0x0c, 0x0f, 0x20, 0x57, 0x4f, 0x52, 0x4c, 0x44, 0x20, 0x31, 0x32, 0x33, 0x20, 0x00, 0x21, 0x1c)
        ))
        assertThat(Petscii.encodeScreencode("✓", true), equalTo(listOf<Short>(0x7a)))
        assertFailsWith<CharConversionException> { Petscii.encodeScreencode("♥", true) }
        assertFailsWith<CharConversionException> { Petscii.encodeScreencode("π", true) }

        assertThat(Petscii.decodeScreencode(listOf(0x08, 0x57, 0x1c, 0x7a), true), equalTo("hW£✓"))
        assertFailsWith<ArrayIndexOutOfBoundsException> { Petscii.decodeScreencode(listOf(-1), true) }
        assertFailsWith<ArrayIndexOutOfBoundsException> { Petscii.decodeScreencode(listOf(256), true) }
    }

    @Test
    fun testScreencodeUppercase() {
        assertThat(Petscii.encodeScreencode("WORLD 123 @!£"), equalTo(
                listOf<Short>(0x17, 0x0f, 0x12, 0x0c, 0x04, 0x20, 0x31, 0x32, 0x33, 0x20, 0x00, 0x21, 0x1c)))
        assertThat(Petscii.encodeScreencode("♥"), equalTo(listOf<Short>(0x53)))
        assertThat(Petscii.encodeScreencode("π"), equalTo(listOf<Short>(0x5e)))
        assertFailsWith<CharConversionException> { Petscii.encodeScreencode("✓") }
        assertFailsWith<CharConversionException> { Petscii.encodeScreencode("hello") }

        assertThat(Petscii.decodeScreencode(listOf(0x17, 0x1c, 0x53, 0x5e)), equalTo("W£♥π"))
        assertFailsWith<ArrayIndexOutOfBoundsException> { Petscii.decodeScreencode(listOf(-1)) }
        assertFailsWith<ArrayIndexOutOfBoundsException> { Petscii.decodeScreencode(listOf(256)) }
    }

    @Test
    fun testLiteralValueComparisons() {
        val ten = NumericLiteralValue(DataType.UWORD, 10, Position.DUMMY)
        val nine = NumericLiteralValue(DataType.UBYTE, 9, Position.DUMMY)
        assertEquals(ten, ten)
        assertNotEquals(ten, nine)
        assertFalse(ten != ten)
        assertTrue(ten != nine)

        assertTrue(ten > nine)
        assertTrue(ten >= nine)
        assertTrue(ten >= ten)
        assertFalse(ten > ten)

        assertFalse(ten < nine)
        assertFalse(ten <= nine)
        assertTrue(ten <= ten)
        assertFalse(ten < ten)

        val abc = StringLiteralValue("abc", false, Position.DUMMY)
        val abd = StringLiteralValue("abd", false, Position.DUMMY)
        assertEquals(abc, abc)
        assertTrue(abc!=abd)
        assertFalse(abc!=abc)
    }
}