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// Copyright 2013 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.
package constant
import (
"fmt"
"go/token"
"math"
"math/big"
"strings"
"testing"
)
var intTests = []string{
// 0-octals
`0_123 = 0123`,
`0123_456 = 0123456`,
// decimals
`1_234 = 1234`,
`1_234_567 = 1234567`,
// hexadecimals
`0X_0 = 0`,
`0X_1234 = 0x1234`,
`0X_CAFE_f00d = 0xcafef00d`,
// octals
`0o0 = 0`,
`0o1234 = 01234`,
`0o01234567 = 01234567`,
`0O0 = 0`,
`0O1234 = 01234`,
`0O01234567 = 01234567`,
`0o_0 = 0`,
`0o_1234 = 01234`,
`0o0123_4567 = 01234567`,
`0O_0 = 0`,
`0O_1234 = 01234`,
`0O0123_4567 = 01234567`,
// binaries
`0b0 = 0`,
`0b1011 = 0xb`,
`0b00101101 = 0x2d`,
`0B0 = 0`,
`0B1011 = 0xb`,
`0B00101101 = 0x2d`,
`0b_0 = 0`,
`0b10_11 = 0xb`,
`0b_0010_1101 = 0x2d`,
}
// The RHS operand may be a floating-point quotient n/d of two integer values n and d.
var floatTests = []string{
// decimal floats
`1_2_3. = 123.`,
`0_123. = 123.`,
`0_0e0 = 0.`,
`1_2_3e0 = 123.`,
`0_123e0 = 123.`,
`0e-0_0 = 0.`,
`1_2_3E+0 = 123.`,
`0123E1_2_3 = 123e123`,
`0.e+1 = 0.`,
`123.E-1_0 = 123e-10`,
`01_23.e123 = 123e123`,
`.0e-1 = .0`,
`.123E+10 = .123e10`,
`.0123E123 = .0123e123`,
`1_2_3.123 = 123.123`,
`0123.01_23 = 123.0123`,
`1e-1000000000 = 0`,
`1e+1000000000 = ?`,
`6e5518446744 = ?`,
`-6e5518446744 = ?`,
// hexadecimal floats
`0x0.p+0 = 0.`,
`0Xdeadcafe.p-10 = 0xdeadcafe/1024`,
`0x1234.P84 = 0x1234000000000000000000000`,
`0x.1p-0 = 1/16`,
`0X.deadcafep4 = 0xdeadcafe/0x10000000`,
`0x.1234P+12 = 0x1234/0x10`,
`0x0p0 = 0.`,
`0Xdeadcafep+1 = 0x1bd5b95fc`,
`0x1234P-10 = 0x1234/1024`,
`0x0.0p0 = 0.`,
`0Xdead.cafep+1 = 0x1bd5b95fc/0x10000`,
`0x12.34P-10 = 0x1234/0x40000`,
`0Xdead_cafep+1 = 0xdeadcafep+1`,
`0x_1234P-10 = 0x1234p-10`,
`0X_dead_cafe.p-10 = 0xdeadcafe.p-10`,
`0x12_34.P1_2_3 = 0x1234.p123`,
}
var imagTests = []string{
`1_234i = 1234i`,
`1_234_567i = 1234567i`,
`0.i = 0i`,
`123.i = 123i`,
`0123.i = 123i`,
`0.e+1i = 0i`,
`123.E-1_0i = 123e-10i`,
`01_23.e123i = 123e123i`,
`1e-1000000000i = 0i`,
`1e+1000000000i = ?`,
`6e5518446744i = ?`,
`-6e5518446744i = ?`,
}
func testNumbers(t *testing.T, kind token.Token, tests []string) {
for _, test := range tests {
a := strings.Split(test, " = ")
if len(a) != 2 {
t.Errorf("invalid test case: %s", test)
continue
}
x := MakeFromLiteral(a[0], kind, 0)
var y Value
if a[1] == "?" {
y = MakeUnknown()
} else {
if i := strings.Index(a[1], "/"); i >= 0 && kind == token.FLOAT {
n := MakeFromLiteral(a[1][:i], token.INT, 0)
d := MakeFromLiteral(a[1][i+1:], token.INT, 0)
y = BinaryOp(n, token.QUO, d)
} else {
y = MakeFromLiteral(a[1], kind, 0)
}
if y.Kind() == Unknown {
panic(fmt.Sprintf("invalid test case: %s %d", test, y.Kind()))
}
}
xk := x.Kind()
yk := y.Kind()
if xk != yk {
t.Errorf("%s: got kind %d != %d", test, xk, yk)
continue
}
if yk == Unknown {
continue
}
if !Compare(x, token.EQL, y) {
t.Errorf("%s: %s != %s", test, x, y)
}
}
}
// TestNumbers verifies that differently written literals
// representing the same number do have the same value.
func TestNumbers(t *testing.T) {
testNumbers(t, token.INT, intTests)
testNumbers(t, token.FLOAT, floatTests)
testNumbers(t, token.IMAG, imagTests)
}
var opTests = []string{
// unary operations
`+ 0 = 0`,
`+ ? = ?`,
`- 1 = -1`,
`- ? = ?`,
`^ 0 = -1`,
`^ ? = ?`,
`! true = false`,
`! false = true`,
`! ? = ?`,
// etc.
// binary operations
`"" + "" = ""`,
`"foo" + "" = "foo"`,
`"" + "bar" = "bar"`,
`"foo" + "bar" = "foobar"`,
`0 + 0 = 0`,
`0 + 0.1 = 0.1`,
`0 + 0.1i = 0.1i`,
`0.1 + 0.9 = 1`,
`1e100 + 1e100 = 2e100`,
`? + 0 = ?`,
`0 + ? = ?`,
`0 - 0 = 0`,
`0 - 0.1 = -0.1`,
`0 - 0.1i = -0.1i`,
`1e100 - 1e100 = 0`,
`? - 0 = ?`,
`0 - ? = ?`,
`0 * 0 = 0`,
`1 * 0.1 = 0.1`,
`1 * 0.1i = 0.1i`,
`1i * 1i = -1`,
`? * 0 = ?`,
`0 * ? = ?`,
`0 * 1e+1000000000 = ?`,
`0 / 0 = "division_by_zero"`,
`10 / 2 = 5`,
`5 / 3 = 5/3`,
`5i / 3i = 5/3`,
`? / 0 = ?`,
`0 / ? = ?`,
`0 * 1e+1000000000i = ?`,
`0 % 0 = "runtime_error:_integer_divide_by_zero"`, // TODO(gri) should be the same as for /
`10 % 3 = 1`,
`? % 0 = ?`,
`0 % ? = ?`,
`0 & 0 = 0`,
`12345 & 0 = 0`,
`0xff & 0xf = 0xf`,
`? & 0 = ?`,
`0 & ? = ?`,
`0 | 0 = 0`,
`12345 | 0 = 12345`,
`0xb | 0xa0 = 0xab`,
`? | 0 = ?`,
`0 | ? = ?`,
`0 ^ 0 = 0`,
`1 ^ -1 = -2`,
`? ^ 0 = ?`,
`0 ^ ? = ?`,
`0 &^ 0 = 0`,
`0xf &^ 1 = 0xe`,
`1 &^ 0xf = 0`,
// etc.
// shifts
`0 << 0 = 0`,
`1 << 10 = 1024`,
`0 >> 0 = 0`,
`1024 >> 10 == 1`,
`? << 0 == ?`,
`? >> 10 == ?`,
// etc.
// comparisons
`false == false = true`,
`false == true = false`,
`true == false = false`,
`true == true = true`,
`false != false = false`,
`false != true = true`,
`true != false = true`,
`true != true = false`,
`"foo" == "bar" = false`,
`"foo" != "bar" = true`,
`"foo" < "bar" = false`,
`"foo" <= "bar" = false`,
`"foo" > "bar" = true`,
`"foo" >= "bar" = true`,
`0 == 0 = true`,
`0 != 0 = false`,
`0 < 10 = true`,
`10 <= 10 = true`,
`0 > 10 = false`,
`10 >= 10 = true`,
`1/123456789 == 1/123456789 == true`,
`1/123456789 != 1/123456789 == false`,
`1/123456789 < 1/123456788 == true`,
`1/123456788 <= 1/123456789 == false`,
`0.11 > 0.11 = false`,
`0.11 >= 0.11 = true`,
`? == 0 = false`,
`? != 0 = false`,
`? < 10 = false`,
`? <= 10 = false`,
`? > 10 = false`,
`? >= 10 = false`,
`0 == ? = false`,
`0 != ? = false`,
`0 < ? = false`,
`10 <= ? = false`,
`0 > ? = false`,
`10 >= ? = false`,
// etc.
}
func TestOps(t *testing.T) {
for _, test := range opTests {
a := strings.Split(test, " ")
i := 0 // operator index
var x, x0 Value
switch len(a) {
case 4:
// unary operation
case 5:
// binary operation
x, x0 = val(a[0]), val(a[0])
i = 1
default:
t.Errorf("invalid test case: %s", test)
continue
}
op, ok := optab[a[i]]
if !ok {
panic("missing optab entry for " + a[i])
}
y, y0 := val(a[i+1]), val(a[i+1])
got := doOp(x, op, y)
want := val(a[i+3])
if !eql(got, want) {
t.Errorf("%s: got %s; want %s", test, got, want)
continue
}
if x0 != nil && !eql(x, x0) {
t.Errorf("%s: x changed to %s", test, x)
continue
}
if !eql(y, y0) {
t.Errorf("%s: y changed to %s", test, y)
continue
}
}
}
func eql(x, y Value) bool {
_, ux := x.(unknownVal)
_, uy := y.(unknownVal)
if ux || uy {
return ux == uy
}
return Compare(x, token.EQL, y)
}
// ----------------------------------------------------------------------------
// String tests
var xxx = strings.Repeat("x", 68)
var issue14262 = `"بموجب الشروط التالية نسب المصنف — يجب عليك أن تنسب العمل بالطريقة التي تحددها المؤلف أو المرخص (ولكن ليس بأي حال من الأحوال أن توحي وتقترح بتحول أو استخدامك للعمل). المشاركة على قدم المساواة — إذا كنت يعدل ، والتغيير ، أو الاستفادة من هذا العمل ، قد ينتج عن توزيع العمل إلا في ظل تشابه او تطابق فى واحد لهذا الترخيص."`
var stringTests = []struct {
input, short, exact string
}{
// Unknown
{"", "unknown", "unknown"},
{"0x", "unknown", "unknown"},
{"'", "unknown", "unknown"},
{"1f0", "unknown", "unknown"},
{"unknown", "unknown", "unknown"},
// Bool
{"true", "true", "true"},
{"false", "false", "false"},
// String
{`""`, `""`, `""`},
{`"foo"`, `"foo"`, `"foo"`},
{`"` + xxx + `xx"`, `"` + xxx + `xx"`, `"` + xxx + `xx"`},
{`"` + xxx + `xxx"`, `"` + xxx + `...`, `"` + xxx + `xxx"`},
{`"` + xxx + xxx + `xxx"`, `"` + xxx + `...`, `"` + xxx + xxx + `xxx"`},
{issue14262, `"بموجب الشروط التالية نسب المصنف — يجب عليك أن تنسب العمل بالطريقة ال...`, issue14262},
// Int
{"0", "0", "0"},
{"-1", "-1", "-1"},
{"12345", "12345", "12345"},
{"-12345678901234567890", "-12345678901234567890", "-12345678901234567890"},
{"12345678901234567890", "12345678901234567890", "12345678901234567890"},
// Float
{"0.", "0", "0"},
{"-0.0", "0", "0"},
{"10.0", "10", "10"},
{"2.1", "2.1", "21/10"},
{"-2.1", "-2.1", "-21/10"},
{"1e9999", "1e+9999", "0x.f8d4a9da224650a8cb2959e10d985ad92adbd44c62917e608b1f24c0e1b76b6f61edffeb15c135a4b601637315f7662f325f82325422b244286a07663c9415d2p+33216"},
{"1e-9999", "1e-9999", "0x.83b01ba6d8c0425eec1b21e96f7742d63c2653ed0a024cf8a2f9686df578d7b07d7a83d84df6a2ec70a921d1f6cd5574893a7eda4d28ee719e13a5dce2700759p-33215"},
{"2.71828182845904523536028747135266249775724709369995957496696763", "2.71828", "271828182845904523536028747135266249775724709369995957496696763/100000000000000000000000000000000000000000000000000000000000000"},
{"0e9999999999", "0", "0"}, // issue #16176
{"-6e-1886451601", "0", "0"}, // issue #20228
// Complex
{"0i", "(0 + 0i)", "(0 + 0i)"},
{"-0i", "(0 + 0i)", "(0 + 0i)"},
{"10i", "(0 + 10i)", "(0 + 10i)"},
{"-10i", "(0 + -10i)", "(0 + -10i)"},
{"1e9999i", "(0 + 1e+9999i)", "(0 + 0x.f8d4a9da224650a8cb2959e10d985ad92adbd44c62917e608b1f24c0e1b76b6f61edffeb15c135a4b601637315f7662f325f82325422b244286a07663c9415d2p+33216i)"},
}
func TestString(t *testing.T) {
for _, test := range stringTests {
x := val(test.input)
if got := x.String(); got != test.short {
t.Errorf("%s: got %q; want %q as short string", test.input, got, test.short)
}
if got := x.ExactString(); got != test.exact {
t.Errorf("%s: got %q; want %q as exact string", test.input, got, test.exact)
}
}
}
// ----------------------------------------------------------------------------
// Support functions
func val(lit string) Value {
if len(lit) == 0 {
return MakeUnknown()
}
switch lit {
case "?":
return MakeUnknown()
case "true":
return MakeBool(true)
case "false":
return MakeBool(false)
}
if i := strings.IndexByte(lit, '/'); i >= 0 {
// assume fraction
a := MakeFromLiteral(lit[:i], token.INT, 0)
b := MakeFromLiteral(lit[i+1:], token.INT, 0)
return BinaryOp(a, token.QUO, b)
}
tok := token.INT
switch first, last := lit[0], lit[len(lit)-1]; {
case first == '"' || first == '`':
tok = token.STRING
lit = strings.ReplaceAll(lit, "_", " ")
case first == '\'':
tok = token.CHAR
case last == 'i':
tok = token.IMAG
default:
if !strings.HasPrefix(lit, "0x") && strings.ContainsAny(lit, "./Ee") {
tok = token.FLOAT
}
}
return MakeFromLiteral(lit, tok, 0)
}
var optab = map[string]token.Token{
"!": token.NOT,
"+": token.ADD,
"-": token.SUB,
"*": token.MUL,
"/": token.QUO,
"%": token.REM,
"<<": token.SHL,
">>": token.SHR,
"&": token.AND,
"|": token.OR,
"^": token.XOR,
"&^": token.AND_NOT,
"==": token.EQL,
"!=": token.NEQ,
"<": token.LSS,
"<=": token.LEQ,
">": token.GTR,
">=": token.GEQ,
}
func panicHandler(v *Value) {
switch p := recover().(type) {
case nil:
// nothing to do
case string:
*v = MakeString(p)
case error:
*v = MakeString(p.Error())
default:
panic(p)
}
}
func doOp(x Value, op token.Token, y Value) (z Value) {
defer panicHandler(&z)
if x == nil {
return UnaryOp(op, y, 0)
}
switch op {
case token.EQL, token.NEQ, token.LSS, token.LEQ, token.GTR, token.GEQ:
return MakeBool(Compare(x, op, y))
case token.SHL, token.SHR:
s, _ := Int64Val(y)
return Shift(x, op, uint(s))
default:
return BinaryOp(x, op, y)
}
}
// ----------------------------------------------------------------------------
// Other tests
var fracTests = []string{
"0",
"1",
"-1",
"1.2",
"-0.991",
"2.718281828",
"3.14159265358979323e-10",
"1e100",
"1e1000",
}
func TestFractions(t *testing.T) {
for _, test := range fracTests {
x := val(test)
// We don't check the actual numerator and denominator because they
// are unlikely to be 100% correct due to floatVal rounding errors.
// Instead, we compute the fraction again and compare the rounded
// result.
q := BinaryOp(Num(x), token.QUO, Denom(x))
got := q.String()
want := x.String()
if got != want {
t.Errorf("%s: got quotient %s, want %s", x, got, want)
}
}
}
var bytesTests = []string{
"0",
"1",
"123456789",
"123456789012345678901234567890123456789012345678901234567890",
}
func TestBytes(t *testing.T) {
for _, test := range bytesTests {
x := val(test)
bytes := Bytes(x)
// special case 0
if Sign(x) == 0 && len(bytes) != 0 {
t.Errorf("%s: got %v; want empty byte slice", test, bytes)
}
if n := len(bytes); n > 0 && bytes[n-1] == 0 {
t.Errorf("%s: got %v; want no leading 0 byte", test, bytes)
}
if got := MakeFromBytes(bytes); !eql(got, x) {
t.Errorf("%s: got %s; want %s (bytes = %v)", test, got, x, bytes)
}
}
}
func TestUnknown(t *testing.T) {
u := MakeUnknown()
var values = []Value{
u,
MakeBool(false), // token.ADD ok below, operation is never considered
MakeString(""),
MakeInt64(1),
MakeFromLiteral("''", token.CHAR, 0),
MakeFromLiteral("-1234567890123456789012345678901234567890", token.INT, 0),
MakeFloat64(1.2),
MakeImag(MakeFloat64(1.2)),
}
for _, val := range values {
x, y := val, u
for i := range [2]int{} {
if i == 1 {
x, y = y, x
}
if got := BinaryOp(x, token.ADD, y); got.Kind() != Unknown {
t.Errorf("%s + %s: got %s; want %s", x, y, got, u)
}
if got := Compare(x, token.EQL, y); got {
t.Errorf("%s == %s: got true; want false", x, y)
}
}
}
}
func TestMakeFloat64(t *testing.T) {
var zero float64
for _, arg := range []float64{
-math.MaxFloat32,
-10,
-0.5,
-zero,
zero,
1,
10,
123456789.87654321e-23,
1e10,
math.MaxFloat64,
} {
val := MakeFloat64(arg)
if val.Kind() != Float {
t.Errorf("%v: got kind = %d; want %d", arg, val.Kind(), Float)
}
// -0.0 is mapped to 0.0
got, exact := Float64Val(val)
if !exact || math.Float64bits(got) != math.Float64bits(arg+0) {
t.Errorf("%v: got %v (exact = %v)", arg, got, exact)
}
}
// infinity
for sign := range []int{-1, 1} {
arg := math.Inf(sign)
val := MakeFloat64(arg)
if val.Kind() != Unknown {
t.Errorf("%v: got kind = %d; want %d", arg, val.Kind(), Unknown)
}
}
}
type makeTestCase struct {
kind Kind
arg, want interface{}
}
func dup(k Kind, x interface{}) makeTestCase { return makeTestCase{k, x, x} }
func TestMake(t *testing.T) {
for _, test := range []makeTestCase{
{Bool, false, false},
{String, "hello", "hello"},
{Int, int64(1), int64(1)},
{Int, big.NewInt(10), int64(10)},
{Int, new(big.Int).Lsh(big.NewInt(1), 62), int64(1 << 62)},
dup(Int, new(big.Int).Lsh(big.NewInt(1), 63)),
{Float, big.NewFloat(0), floatVal0.val},
dup(Float, big.NewFloat(2.0)),
dup(Float, big.NewRat(1, 3)),
} {
val := Make(test.arg)
got := Val(val)
if val.Kind() != test.kind || got != test.want {
t.Errorf("got %v (%T, kind = %d); want %v (%T, kind = %d)",
got, got, val.Kind(), test.want, test.want, test.kind)
}
}
}
func BenchmarkStringAdd(b *testing.B) {
for size := 1; size <= 65536; size *= 4 {
b.Run(fmt.Sprint(size), func(b *testing.B) {
b.ReportAllocs()
n := int64(0)
for i := 0; i < b.N; i++ {
x := MakeString(strings.Repeat("x", 100))
y := x
for j := 0; j < size-1; j++ {
y = BinaryOp(y, token.ADD, x)
}
n += int64(len(StringVal(y)))
}
if n != int64(b.N)*int64(size)*100 {
b.Fatalf("bad string %d != %d", n, int64(b.N)*int64(size)*100)
}
})
}
}