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// $G $F.go && $L $F.$A && ./$A.out

// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Semi-exhaustive test for append()

package main

import (
        "fmt"
        "reflect"
)


func verify(name string, result, expected interface{}) {
        if !reflect.DeepEqual(result, expected) {
                panic(name)
        }
}


func main() {
        for _, t := range tests {
                verify(t.name, t.result, t.expected)
        }
        verifyStruct()
        verifyInterface()
}


var tests = []struct {
        name             string
        result, expected interface{}
}{
        {"bool a", append([]bool{}), []bool{}},
        {"bool b", append([]bool{}, true), []bool{true}},
        {"bool c", append([]bool{}, true, false, true, true), []bool{true, false, true, true}},

        {"bool d", append([]bool{true, false, true}), []bool{true, false, true}},
        {"bool e", append([]bool{true, false, true}, false), []bool{true, false, true, false}},
        {"bool f", append([]bool{true, false, true}, false, false, false), []bool{true, false, true, false, false, false}},

        {"bool g", append([]bool{}, []bool{true}...), []bool{true}},
        {"bool h", append([]bool{}, []bool{true, false, true, false}...), []bool{true, false, true, false}},

        {"bool i", append([]bool{true, false, true}, []bool{true}...), []bool{true, false, true, true}},
        {"bool j", append([]bool{true, false, true}, []bool{true, true, true}...), []bool{true, false, true, true, true, true}},


        {"byte a", append([]byte{}), []byte{}},
        {"byte b", append([]byte{}, 0), []byte{0}},
        {"byte c", append([]byte{}, 0, 1, 2, 3), []byte{0, 1, 2, 3}},

        {"byte d", append([]byte{0, 1, 2}), []byte{0, 1, 2}},
        {"byte e", append([]byte{0, 1, 2}, 3), []byte{0, 1, 2, 3}},
        {"byte f", append([]byte{0, 1, 2}, 3, 4, 5), []byte{0, 1, 2, 3, 4, 5}},

        {"byte g", append([]byte{}, []byte{0}...), []byte{0}},
        {"byte h", append([]byte{}, []byte{0, 1, 2, 3}...), []byte{0, 1, 2, 3}},

        {"byte i", append([]byte{0, 1, 2}, []byte{3}...), []byte{0, 1, 2, 3}},
        {"byte j", append([]byte{0, 1, 2}, []byte{3, 4, 5}...), []byte{0, 1, 2, 3, 4, 5}},

        {"bytestr a", append([]byte{}, "0"...), []byte("0")},
        {"bytestr b", append([]byte{}, "0123"...), []byte("0123")},

        {"bytestr c", append([]byte("012"), "3"...), []byte("0123")},
        {"bytestr d", append([]byte("012"), "345"...), []byte("012345")},

        {"int16 a", append([]int16{}), []int16{}},
        {"int16 b", append([]int16{}, 0), []int16{0}},
        {"int16 c", append([]int16{}, 0, 1, 2, 3), []int16{0, 1, 2, 3}},

        {"int16 d", append([]int16{0, 1, 2}), []int16{0, 1, 2}},
        {"int16 e", append([]int16{0, 1, 2}, 3), []int16{0, 1, 2, 3}},
        {"int16 f", append([]int16{0, 1, 2}, 3, 4, 5), []int16{0, 1, 2, 3, 4, 5}},

        {"int16 g", append([]int16{}, []int16{0}...), []int16{0}},
        {"int16 h", append([]int16{}, []int16{0, 1, 2, 3}...), []int16{0, 1, 2, 3}},

        {"int16 i", append([]int16{0, 1, 2}, []int16{3}...), []int16{0, 1, 2, 3}},
        {"int16 j", append([]int16{0, 1, 2}, []int16{3, 4, 5}...), []int16{0, 1, 2, 3, 4, 5}},


        {"uint32 a", append([]uint32{}), []uint32{}},
        {"uint32 b", append([]uint32{}, 0), []uint32{0}},
        {"uint32 c", append([]uint32{}, 0, 1, 2, 3), []uint32{0, 1, 2, 3}},

        {"uint32 d", append([]uint32{0, 1, 2}), []uint32{0, 1, 2}},
        {"uint32 e", append([]uint32{0, 1, 2}, 3), []uint32{0, 1, 2, 3}},
        {"uint32 f", append([]uint32{0, 1, 2}, 3, 4, 5), []uint32{0, 1, 2, 3, 4, 5}},

        {"uint32 g", append([]uint32{}, []uint32{0}...), []uint32{0}},
        {"uint32 h", append([]uint32{}, []uint32{0, 1, 2, 3}...), []uint32{0, 1, 2, 3}},

        {"uint32 i", append([]uint32{0, 1, 2}, []uint32{3}...), []uint32{0, 1, 2, 3}},
        {"uint32 j", append([]uint32{0, 1, 2}, []uint32{3, 4, 5}...), []uint32{0, 1, 2, 3, 4, 5}},


        {"float64 a", append([]float64{}), []float64{}},
        {"float64 b", append([]float64{}, 0), []float64{0}},
        {"float64 c", append([]float64{}, 0, 1, 2, 3), []float64{0, 1, 2, 3}},

        {"float64 d", append([]float64{0, 1, 2}), []float64{0, 1, 2}},
        {"float64 e", append([]float64{0, 1, 2}, 3), []float64{0, 1, 2, 3}},
        {"float64 f", append([]float64{0, 1, 2}, 3, 4, 5), []float64{0, 1, 2, 3, 4, 5}},

        {"float64 g", append([]float64{}, []float64{0}...), []float64{0}},
        {"float64 h", append([]float64{}, []float64{0, 1, 2, 3}...), []float64{0, 1, 2, 3}},

        {"float64 i", append([]float64{0, 1, 2}, []float64{3}...), []float64{0, 1, 2, 3}},
        {"float64 j", append([]float64{0, 1, 2}, []float64{3, 4, 5}...), []float64{0, 1, 2, 3, 4, 5}},


        {"complex128 a", append([]complex128{}), []complex128{}},
        {"complex128 b", append([]complex128{}, 0), []complex128{0}},
        {"complex128 c", append([]complex128{}, 0, 1, 2, 3), []complex128{0, 1, 2, 3}},

        {"complex128 d", append([]complex128{0, 1, 2}), []complex128{0, 1, 2}},
        {"complex128 e", append([]complex128{0, 1, 2}, 3), []complex128{0, 1, 2, 3}},
        {"complex128 f", append([]complex128{0, 1, 2}, 3, 4, 5), []complex128{0, 1, 2, 3, 4, 5}},

        {"complex128 g", append([]complex128{}, []complex128{0}...), []complex128{0}},
        {"complex128 h", append([]complex128{}, []complex128{0, 1, 2, 3}...), []complex128{0, 1, 2, 3}},

        {"complex128 i", append([]complex128{0, 1, 2}, []complex128{3}...), []complex128{0, 1, 2, 3}},
        {"complex128 j", append([]complex128{0, 1, 2}, []complex128{3, 4, 5}...), []complex128{0, 1, 2, 3, 4, 5}},


        {"string a", append([]string{}), []string{}},
        {"string b", append([]string{}, "0"), []string{"0"}},
        {"string c", append([]string{}, "0", "1", "2", "3"), []string{"0", "1", "2", "3"}},

        {"string d", append([]string{"0", "1", "2"}), []string{"0", "1", "2"}},
        {"string e", append([]string{"0", "1", "2"}, "3"), []string{"0", "1", "2", "3"}},
        {"string f", append([]string{"0", "1", "2"}, "3", "4", "5"), []string{"0", "1", "2", "3", "4", "5"}},

        {"string g", append([]string{}, []string{"0"}...), []string{"0"}},
        {"string h", append([]string{}, []string{"0", "1", "2", "3"}...), []string{"0", "1", "2", "3"}},

        {"string i", append([]string{"0", "1", "2"}, []string{"3"}...), []string{"0", "1", "2", "3"}},
        {"string j", append([]string{"0", "1", "2"}, []string{"3", "4", "5"}...), []string{"0", "1", "2", "3", "4", "5"}},
}


func verifyStruct() {
        type T struct {
                a, b, c string
        }
        type S []T
        e := make(S, 100)
        for i := range e {
                e[i] = T{"foo", fmt.Sprintf("%d", i), "bar"}
        }

        verify("struct a", append(S{}), S{})
        verify("struct b", append(S{}, e[0]), e[0:1])
        verify("struct c", append(S{}, e[0], e[1], e[2]), e[0:3])

        verify("struct d", append(e[0:1]), e[0:1])
        verify("struct e", append(e[0:1], e[1]), e[0:2])
        verify("struct f", append(e[0:1], e[1], e[2], e[3]), e[0:4])

        verify("struct g", append(e[0:3]), e[0:3])
        verify("struct h", append(e[0:3], e[3]), e[0:4])
        verify("struct i", append(e[0:3], e[3], e[4], e[5], e[6]), e[0:7])

        for i := range e {
                verify("struct j", append(S{}, e[0:i]...), e[0:i])
                input := make(S, i)
                copy(input, e[0:i])
                verify("struct k", append(input, e[i:]...), e)
                verify("struct k - input modified", input, e[0:i])
        }

        s := make(S, 10, 20)
        r := make(S, len(s)+len(e))
        for i, x := range e {
                r[len(s)+i] = x
        }
        verify("struct l", append(s), s)
        verify("struct m", append(s, e...), r)
}


func verifyInterface() {
        type T interface{}
        type S []T
        e := make(S, 100)
        for i := range e {
                switch i % 4 {
                case 0:
                        e[i] = i
                case 1:
                        e[i] = "foo"
                case 2:
                        e[i] = fmt.Sprintf("%d", i)
                case 3:
                        e[i] = float64(i)
                }
        }

        verify("interface a", append(S{}), S{})
        verify("interface b", append(S{}, e[0]), e[0:1])
        verify("interface c", append(S{}, e[0], e[1], e[2]), e[0:3])

        verify("interface d", append(e[0:1]), e[0:1])
        verify("interface e", append(e[0:1], e[1]), e[0:2])
        verify("interface f", append(e[0:1], e[1], e[2], e[3]), e[0:4])

        verify("interface g", append(e[0:3]), e[0:3])
        verify("interface h", append(e[0:3], e[3]), e[0:4])
        verify("interface i", append(e[0:3], e[3], e[4], e[5], e[6]), e[0:7])

        for i := range e {
                verify("interface j", append(S{}, e[0:i]...), e[0:i])
                input := make(S, i)
                copy(input, e[0:i])
                verify("interface k", append(input, e[i:]...), e)
                verify("interface k - input modified", input, e[0:i])
        }

        s := make(S, 10, 20)
        r := make(S, len(s)+len(e))
        for i, x := range e {
                r[len(s)+i] = x
        }
        verify("interface l", append(s), s)
        verify("interface m", append(s, e...), r)
}