unpack_test.go

package reflectutils_test

import (
	"encoding"
	"flag"
	"fmt"
	"reflect"
	"strconv"
	"testing"
	"time"

	"github.com/muir/reflectutils"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

type Foo string

func (fp *Foo) UnmarshalText(b []byte) error {
	*fp = Foo("~" + string(b) + "~")
	return nil
}

var _ encoding.TextUnmarshaler = func() *Foo { var x Foo; return &x }()

type Bar string

func (bp *Bar) Set(s string) error {
	*bp = Bar(s + "/e")
	return nil
}

func (bp Bar) String() string {
	return "b/" + string(bp)
}

var _ flag.Value = func() *Bar { var x Bar; return &x }()

func TestStringSetter(t *testing.T) {
	type J struct {
		A int
		B string
	}
	type tsType struct {
		Int        int             `value:"38"`
		Int8       int8            `value:"-9"`
		Int16      int16           `value:"329"`
		Int32      int32           `value:"-32902"`
		Int64      int64           `value:"3292929"`
		Uint       uint            `value:"202"`
		Uint8      uint8           `value:"99"`
		Uint16     uint16          `value:"3020"`
		Uint32     uint32          `value:"92020"`
		Uint64     uint64          `value:"320202"`
		Float32    float32         `value:"3.9"`
		Float64    float64         `value:"4.32e7" want:"4.32e+07"`
		String     string          `value:"foo"`
		Bool       bool            `value:"false"`
		IntP       *int            `value:"-82"`
		Int8P      *int8           `value:"-2"`
		Int16P     *int16          `value:"-39"`
		Int32P     *int32          `value:"-329"`
		Int64P     *int64          `value:"-3292"`
		UintP      *uint           `value:"239"`
		Uint8P     *uint8          `value:"92"`
		Uint16P    *uint16         `value:"330"`
		Uint32P    *uint32         `value:"239239"`
		Uint64P    *uint64         `value:"3923"`
		Float32P   *float32        `value:"3.299"`
		Float64P   *float64        `value:"9.2"`
		StringP    *string         `value:"foop"`
		Complex64  *complex64      `value:"4+3i"     want:"(4+3i)"`
		Complex128 *complex128     `value:"3.9+2.6i" want:"(3.9+2.6i)"`
		BoolP      *bool           `value:"true"`
		IntSlice   []int           `value:"3,9,-10"  want:"[3 9 -10]"`
		IntArray   [2]int          `value:"22,11"    want:"[22 11]"`
		Foo        Foo             `value:"foo"      want:"~foo~"`
		FooArray   [2]Foo          `value:"a,b,c"    want:"[~a~ ~b,c~]"`
		FooP       *Foo            `value:"foo"      want:"~foo~"`
		Dur        time.Duration   `value:"30m"      want:"30m0s"`
		DurP       *time.Duration  `value:"15m"      want:"15m0s"`
		DurArray   []time.Duration `value:"15m,45m"  want:"[15m0s 45m0s]"`
		Bar        Bar             `value:"bar"      want:"b/bar/e"`
		BarArray   [2]Bar          `value:"a,b,c"    want:"[b/a/e b/b,c/e]"`
		BarP       *Bar            `value:"bar"      want:"b/bar/e"`
		SS1        []string        `value:"foo/bar"  want:"[foo/bar]"`
		SS2        []string        `value:"foo/bar"  want:"[foo bar]"   split:"/"`
		SS3        []string        `value:"foo,bar"  want:"[foo,bar]"   split:""`
		SS4        []string        `value:"foo,bar"  want:"[foo bar]"   split:","`
		SA1        [2]string       `value:"foo/bar"  want:"[foo/bar ]"`
		SA2        [2]string       `value:"foo/bar"  want:"[foo bar]"   split:"/"`
		SA3        [2]string       `value:"foo,bar"  want:"[foo,bar ]"  split:""`
		SS5        []string        `value:"foo"      want:"[foo bar]"   value2:"bar"`
		SS6        []string        `value:"foo"      want:"[bar]"       value2:"bar" sa:"f"`
		RG01       *[]int          `value:"823:29"   want:"[823 29]"    split:":"`
		S          *J              `value:"{\"A\":10,\"B\":\"bar\"}"  want:"{A:10 B:bar}" fj:"t"`
	}
	var ts tsType
	vp := reflect.ValueOf(&ts)
	v := reflect.Indirect(vp)
	var count int
	reflectutils.WalkStructElements(v.Type(), func(f reflect.StructField) bool {
		t.Run(f.Name+"-"+f.Type.String(), func(t *testing.T) {
			t.Logf("field %s, a %s", f.Name, f.Type)
			value, ok := f.Tag.Lookup("value")
			if !assert.Truef(t, ok, "input value for %s", f.Name) {
				return
			}
			want, ok := f.Tag.Lookup("want")
			if !ok {
				want = value
			}
			var opts []reflectutils.StringSetterArg
			if split, ok := f.Tag.Lookup("split"); ok {
				t.Log("  splitting on", split)
				opts = append(opts, reflectutils.WithSplitOn(split))
			}
			if sa, ok := f.Tag.Lookup("sa"); ok {
				b, err := strconv.ParseBool(sa)
				require.NoError(t, err, "parse sa")
				t.Log("  slice append", b)
				opts = append(opts, reflectutils.SliceAppend(b))
			}
			if fj, ok := f.Tag.Lookup("fj"); ok {
				b, err := strconv.ParseBool(fj)
				require.NoError(t, err, "parse fj")
				t.Log("  force JSON", b)
				opts = append(opts, reflectutils.ForceJSON(b))
			}

			fn, err := reflectutils.MakeStringSetter(f.Type, opts...)
			if !assert.NoErrorf(t, err, "make string setter for %s", f.Name) {
				return
			}
			e := v.FieldByIndex(f.Index)
			err = fn(e, value)
			if assert.NoError(t, err, "set %s to '%s'", f.Name, value) {
				value2, ok := f.Tag.Lookup("value2")
				if ok {
					err := fn(e, value2)
					assert.NoError(t, err, "set value2")
				}
				ge := e
				if f.Type.Kind() == reflect.Ptr {
					ge = e.Elem()
				}
				assert.Equalf(t, want, fmt.Sprintf("%+v", ge.Interface()), "got setting %s to '%s'", f.Name, value)
			}
			count++
		})
		return true
	})
	assert.Equal(t, v.NumField(), count, "number of fields tested")
}