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- package vals
- import (
- "math/big"
- "reflect"
- "testing"
- "src.elv.sh/pkg/eval/errs"
- . "src.elv.sh/pkg/tt"
- )
- type someType struct {
- Foo string
- }
- func TestScanToGo_ConcreteTypeDst(t *testing.T) {
- // A wrapper around ScanToGo, to make it easier to test. Instead of
- // supplying a pointer to the destination, an initial value to the
- // destination is supplied and the result is returned.
- scanToGo := func(src interface{}, dstInit interface{}) (interface{}, error) {
- ptr := reflect.New(TypeOf(dstInit))
- err := ScanToGo(src, ptr.Interface())
- return ptr.Elem().Interface(), err
- }
- Test(t, Fn("ScanToGo", scanToGo), Table{
- // int
- Args("12", 0).Rets(12),
- Args("0x12", 0).Rets(0x12),
- Args(12.0, 0).Rets(0, errMustBeInteger),
- Args(0.5, 0).Rets(0, errMustBeInteger),
- Args(someType{}, 0).Rets(Any, errMustBeInteger),
- Args("x", 0).Rets(Any, cannotParseAs{"integer", "x"}),
- // float64
- Args(23, 0.0).Rets(23.0),
- Args(big.NewRat(1, 2), 0.0).Rets(0.5),
- Args(1.2, 0.0).Rets(1.2),
- Args("23", 0.0).Rets(23.0),
- Args("0x23", 0.0).Rets(float64(0x23)),
- Args(someType{}, 0.0).Rets(Any, errMustBeNumber),
- Args("x", 0.0).Rets(Any, cannotParseAs{"number", "x"}),
- // rune
- Args("x", ' ').Rets('x'),
- Args(someType{}, ' ').Rets(Any, errMustBeString),
- Args("\xc3\x28", ' ').Rets(Any, errMustBeValidUTF8), // Invalid UTF8
- Args("ab", ' ').Rets(Any, errMustHaveSingleRune),
- // Other types don't undergo any conversion, as long as the types match
- Args("foo", "").Rets("foo"),
- Args(someType{"foo"}, someType{}).Rets(someType{"foo"}),
- Args(nil, nil).Rets(nil),
- Args("x", someType{}).Rets(Any, WrongType{"!!vals.someType", "string"}),
- })
- }
- func TestScanToGo_NumDst(t *testing.T) {
- scanToGo := func(src interface{}) (Num, error) {
- var n Num
- err := ScanToGo(src, &n)
- return n, err
- }
- Test(t, Fn("ScanToGo", scanToGo), Table{
- // Strings are automatically converted
- Args("12").Rets(12),
- Args(z).Rets(bigInt(z)),
- Args("1/2").Rets(big.NewRat(1, 2)),
- Args("12.0").Rets(12.0),
- // Already numbers
- Args(12).Rets(12),
- Args(bigInt(z)).Rets(bigInt(z)),
- Args(big.NewRat(1, 2)).Rets(big.NewRat(1, 2)),
- Args(12.0).Rets(12.0),
- Args("bad").Rets(Any, cannotParseAs{"number", "bad"}),
- Args(EmptyList).Rets(Any, errMustBeNumber),
- })
- }
- func TestScanToGo_InterfaceDst(t *testing.T) {
- scanToGo := func(src interface{}) (interface{}, error) {
- var l List
- err := ScanToGo(src, &l)
- return l, err
- }
- Test(t, Fn("ScanToGo", scanToGo), Table{
- Args(EmptyList).Rets(EmptyList),
- Args("foo").Rets(Any, WrongType{"!!vector.Vector", "string"}),
- })
- }
- func TestScanToGo_ErrorsWithNonPointerDst(t *testing.T) {
- err := ScanToGo("", 1)
- if err == nil {
- t.Errorf("did not return error")
- }
- }
- func TestScanListToGo(t *testing.T) {
- // A wrapper around ScanListToGo, to make it easier to test.
- scanListToGo := func(src List, dstInit interface{}) (interface{}, error) {
- ptr := reflect.New(TypeOf(dstInit))
- ptr.Elem().Set(reflect.ValueOf(dstInit))
- err := ScanListToGo(src, ptr.Interface())
- return ptr.Elem().Interface(), err
- }
- Test(t, Fn("ScanListToGo", scanListToGo), Table{
- Args(MakeList("1", "2"), []int{}).Rets([]int{1, 2}),
- Args(MakeList("1", "2"), []string{}).Rets([]string{"1", "2"}),
- Args(MakeList("1", "a"), []int{}).Rets([]int{}, cannotParseAs{"integer", "a"}),
- })
- }
- func TestScanListElementsToGo(t *testing.T) {
- // A wrapper around ScanListElementsToGo, to make it easier to test.
- scanListElementsToGo := func(src List, inits ...interface{}) ([]interface{}, error) {
- ptrs := make([]interface{}, len(inits))
- for i, init := range inits {
- if o, ok := init.(optional); ok {
- // Wrapping the init value with Optional translates to wrapping
- // the pointer with Optional.
- ptrs[i] = Optional(reflect.New(TypeOf(o.ptr)).Interface())
- } else {
- ptrs[i] = reflect.New(TypeOf(init)).Interface()
- }
- }
- err := ScanListElementsToGo(src, ptrs...)
- vals := make([]interface{}, len(ptrs))
- for i, ptr := range ptrs {
- if o, ok := ptr.(optional); ok {
- vals[i] = reflect.ValueOf(o.ptr).Elem().Interface()
- } else {
- vals[i] = reflect.ValueOf(ptr).Elem().Interface()
- }
- }
- return vals, err
- }
- Test(t, Fn("ScanListElementsToGo", scanListElementsToGo), Table{
- Args(MakeList("1", "2"), 0, 0).Rets([]interface{}{1, 2}),
- Args(MakeList("1", "2"), "", "").Rets([]interface{}{"1", "2"}),
- Args(MakeList("1", "2"), 0, Optional(0)).Rets([]interface{}{1, 2}),
- Args(MakeList("1"), 0, Optional(0)).Rets([]interface{}{1, 0}),
- Args(MakeList("a"), 0).Rets([]interface{}{0},
- cannotParseAs{"integer", "a"}),
- Args(MakeList("1"), 0, 0).Rets([]interface{}{0, 0},
- errs.ArityMismatch{What: "list elements",
- ValidLow: 2, ValidHigh: 2, Actual: 1}),
- Args(MakeList("1"), 0, 0, Optional(0)).Rets([]interface{}{0, 0, 0},
- errs.ArityMismatch{What: "list elements",
- ValidLow: 2, ValidHigh: 3, Actual: 1}),
- })
- }
- type aStruct struct {
- Foo int
- bar interface{}
- }
- // Equal is required by cmp.Diff, since aStruct contains unexported fields.
- func (a aStruct) Equal(b aStruct) bool { return a == b }
- func TestScanMapToGo(t *testing.T) {
- // A wrapper around ScanMapToGo, to make it easier to test.
- scanMapToGo := func(src Map, dstInit interface{}) (interface{}, error) {
- ptr := reflect.New(TypeOf(dstInit))
- ptr.Elem().Set(reflect.ValueOf(dstInit))
- err := ScanMapToGo(src, ptr.Interface())
- return ptr.Elem().Interface(), err
- }
- Test(t, Fn("ScanListToGo", scanMapToGo), Table{
- Args(MakeMap("foo", "1"), aStruct{}).Rets(aStruct{Foo: 1}),
- // More fields is OK
- Args(MakeMap("foo", "1", "bar", "x"), aStruct{}).Rets(aStruct{Foo: 1}),
- // Fewer fields is OK
- Args(MakeMap(), aStruct{}).Rets(aStruct{}),
- // Unexported fields are ignored
- Args(MakeMap("bar", 20), aStruct{bar: 10}).Rets(aStruct{bar: 10}),
- // Conversion error
- Args(MakeMap("foo", "a"), aStruct{}).
- Rets(aStruct{}, cannotParseAs{"integer", "a"}),
- })
- }
- func TestFromGo(t *testing.T) {
- Test(t, Fn("FromGo", FromGo), Table{
- // BigInt -> int, when in range
- Args(bigInt(z)).Rets(bigInt(z)),
- Args(big.NewInt(100)).Rets(100),
- // BigRat -> BigInt or int, when denominator is 1
- Args(bigRat(z1 + "/" + z)).Rets(bigRat(z1 + "/" + z)),
- Args(bigRat(z + "/1")).Rets(bigInt(z)),
- Args(bigRat("2/1")).Rets(2),
- // rune -> string
- Args('x').Rets("x"),
- // Other types don't undergo any conversion
- Args(nil).Rets(nil),
- Args(someType{"foo"}).Rets(someType{"foo"}),
- })
- }
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