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Merge pull request #137 from cybozu-go/arithmetic
Arithmetic functions for Ignition templates, et al.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,146 @@ | ||
| package sabakan | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "errors" | ||
| ) | ||
|
|
||
| var ( | ||
| errNotInt = errors.New("not an integer") | ||
| errNotFloat = errors.New("not a float") | ||
| errZeroDivision = errors.New("zero division") | ||
| ) | ||
|
|
||
| func jsonFunc(i interface{}) (string, error) { | ||
| data, err := json.Marshal(i) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| return string(data), nil | ||
| } | ||
|
|
||
| func getAsInt64(a interface{}) (int64, error) { | ||
| switch i := a.(type) { | ||
| case int: | ||
| return int64(i), nil | ||
| case int8: | ||
| return int64(i), nil | ||
| case int16: | ||
| return int64(i), nil | ||
| case int32: | ||
| return int64(i), nil | ||
| case int64: | ||
| return int64(i), nil | ||
| case uint: | ||
| return int64(i), nil | ||
| case uint8: | ||
| return int64(i), nil | ||
| case uint16: | ||
| return int64(i), nil | ||
| case uint32: | ||
| return int64(i), nil | ||
| case uint64: | ||
| return int64(i), nil | ||
| } | ||
|
|
||
| return 0, errNotInt | ||
| } | ||
|
|
||
| func getAsFloat64(a interface{}) (float64, error) { | ||
| switch f := a.(type) { | ||
| case float32: | ||
| return float64(f), nil | ||
| case float64: | ||
| return f, nil | ||
| } | ||
|
|
||
| return 0, errNotFloat | ||
| } | ||
|
|
||
| func getAsInts(a, b interface{}) (int64, int64, error) { | ||
| ia, err := getAsInt64(a) | ||
| if err != nil { | ||
| return 0, 0, err | ||
| } | ||
| ib, err := getAsInt64(b) | ||
| if err != nil { | ||
| return 0, 0, err | ||
| } | ||
|
|
||
| return ia, ib, nil | ||
| } | ||
|
|
||
| func getAsFloats(a, b interface{}) (float64, float64, error) { | ||
| fa, err := getAsFloat64(a) | ||
| if err != nil { | ||
| ia, err2 := getAsInt64(a) | ||
| if err2 != nil { | ||
| return 0, 0, err | ||
| } | ||
| fa = float64(ia) | ||
| } | ||
| fb, err := getAsFloat64(b) | ||
| if err != nil { | ||
| ib, err2 := getAsInt64(b) | ||
| if err2 != nil { | ||
| return 0, 0, err | ||
| } | ||
| fb = float64(ib) | ||
| } | ||
|
|
||
| return fa, fb, nil | ||
| } | ||
|
|
||
| func addFunc(a, b interface{}) (interface{}, error) { | ||
| ia, ib, err := getAsInts(a, b) | ||
| if err == nil { | ||
| return ia + ib, nil | ||
| } | ||
| fa, fb, err := getAsFloats(a, b) | ||
| if err == nil { | ||
| return fa + fb, nil | ||
| } | ||
| return nil, err | ||
| } | ||
|
|
||
| func subFunc(a, b interface{}) (interface{}, error) { | ||
| ia, ib, err := getAsInts(a, b) | ||
| if err == nil { | ||
| return ia - ib, nil | ||
| } | ||
| fa, fb, err := getAsFloats(a, b) | ||
| if err == nil { | ||
| return fa - fb, nil | ||
| } | ||
| return nil, err | ||
| } | ||
|
|
||
| func mulFunc(a, b interface{}) (interface{}, error) { | ||
| ia, ib, err := getAsInts(a, b) | ||
| if err == nil { | ||
| return ia * ib, nil | ||
| } | ||
| fa, fb, err := getAsFloats(a, b) | ||
| if err == nil { | ||
| return fa * fb, nil | ||
| } | ||
| return nil, err | ||
| } | ||
|
|
||
| func divFunc(a, b interface{}) (interface{}, error) { | ||
| ia, ib, err := getAsInts(a, b) | ||
| if err == nil { | ||
| if ib == 0 { | ||
| return nil, errZeroDivision | ||
| } | ||
| return ia / ib, nil | ||
| } | ||
| fa, fb, err := getAsFloats(a, b) | ||
| if err == nil { | ||
| if fb == 0 { | ||
| return nil, errZeroDivision | ||
| } | ||
| return fa / fb, nil | ||
| } | ||
| return nil, err | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| package sabakan | ||
|
|
||
| import ( | ||
| "math" | ||
| "testing" | ||
|
|
||
| "github.com/google/go-cmp/cmp" | ||
| ) | ||
|
|
||
| func testArithmeticFuncs(t *testing.T) { | ||
| cases := []struct { | ||
| name string | ||
| f func(a, b interface{}) (interface{}, error) | ||
| a interface{} | ||
| b interface{} | ||
| expect interface{} | ||
| wantErr bool | ||
| }{ | ||
| {"addInt2", addFunc, int(3), int(-1), int64(2), false}, | ||
| {"addInt8Int16", addFunc, int8(3), int16(-1), int64(2), false}, | ||
| {"addInt32Int64", addFunc, int32(3), int64(-1), int64(2), false}, | ||
| {"addUintUint8", addFunc, uint(3), uint8(1), int64(4), false}, | ||
| {"addUint16Uint32", addFunc, uint16(3), uint32(1), int64(4), false}, | ||
| {"addUint32Uint64", addFunc, uint32(3), uint64(1), int64(4), false}, | ||
| {"addIntFloat32", addFunc, int(3), float32(-1.3), float64(1.7), false}, | ||
| {"addFloat64Uint", addFunc, float64(3.3), uint(1), float64(4.3), false}, | ||
| {"addFloat32Float64", addFunc, float32(3.3), float64(1), float64(4.3), false}, | ||
| {"addInt64String", addFunc, int64(-1), "", nil, true}, | ||
| {"addFloat64String", addFunc, float64(1.7), "", nil, true}, | ||
| {"subInt2", subFunc, int(3), int(-1), int64(4), false}, | ||
| {"subInt8Int16", subFunc, int8(3), int16(-1), int64(4), false}, | ||
| {"subInt32Int64", subFunc, int32(3), int64(-1), int64(4), false}, | ||
| {"subUintUint8", subFunc, uint(3), uint8(1), int64(2), false}, | ||
| {"subUint16Uint32", subFunc, uint16(3), uint32(1), int64(2), false}, | ||
| {"subUint32Uint64", subFunc, uint32(3), uint64(1), int64(2), false}, | ||
| {"subIntFloat32", subFunc, int(3), float32(-1.3), float64(4.3), false}, | ||
| {"subFloat64Uint", subFunc, float64(3.3), uint(1), float64(2.3), false}, | ||
| {"subInt64String", subFunc, int64(-1), "", nil, true}, | ||
| {"subFloat64String", subFunc, float64(1.7), "", nil, true}, | ||
| {"mulInt2", mulFunc, int(3), int(-1), int64(-3), false}, | ||
| {"mulInt8Int16", mulFunc, int8(3), int16(-1), int64(-3), false}, | ||
| {"mulInt32Int64", mulFunc, int32(3), int64(-1), int64(-3), false}, | ||
| {"mulUintUint8", mulFunc, uint(3), uint8(1), int64(3), false}, | ||
| {"mulUint16Uint32", mulFunc, uint16(3), uint32(1), int64(3), false}, | ||
| {"mulUint32Uint64", mulFunc, uint32(3), uint64(1), int64(3), false}, | ||
| {"mulIntFloat32", mulFunc, int(3), float32(-1.3), float64(-3.9), false}, | ||
| {"mulFloat64Uint", mulFunc, float64(3.3), uint(1), float64(3.3), false}, | ||
| {"mulInt64String", mulFunc, int64(-1), "", nil, true}, | ||
| {"mulFloat64String", mulFunc, float64(1.7), "", nil, true}, | ||
| {"divInt2", divFunc, int(4), int(2), int64(2), false}, | ||
| {"divInt8Int16", divFunc, int8(4), int16(2), int64(2), false}, | ||
| {"divInt32Int64", divFunc, int32(4), int64(2), int64(2), false}, | ||
| {"divUintUint8", divFunc, uint(4), uint8(2), int64(2), false}, | ||
| {"divUint16Uint32", divFunc, uint16(4), uint32(2), int64(2), false}, | ||
| {"divUint32Uint64", divFunc, uint32(4), uint64(2), int64(2), false}, | ||
| {"divFloat32Int", divFunc, float32(3.9), int(3), float64(1.3), false}, | ||
| {"divFloat64Uint", divFunc, float64(3.9), uint(3), float64(1.3), false}, | ||
| {"divisionByIntZero", divFunc, int(10), int64(0), nil, true}, | ||
| {"divisionByFloat64Zero", divFunc, int(10), float64(0), nil, true}, | ||
| {"divInt64String", divFunc, int64(-1), "", nil, true}, | ||
| {"divFloat64String", divFunc, float64(1.7), "", nil, true}, | ||
| } | ||
|
|
||
| for _, tt := range cases { | ||
| tt := tt | ||
| t.Run(tt.name, func(t *testing.T) { | ||
| t.Parallel() | ||
| actual, err := tt.f(tt.a, tt.b) | ||
| if err != nil { | ||
| if !tt.wantErr { | ||
| t.Error("unexpected error:", err) | ||
| } | ||
| return | ||
| } | ||
|
|
||
| if !cmp.Equal(tt.expect, actual, testCmp) { | ||
| t.Error("unexpected result:", cmp.Diff(tt.expect, actual, testCmp)) | ||
| } | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| var testCmp = cmp.Comparer(func(a, b float64) bool { | ||
| return math.Abs(a-b) < 0.0001 | ||
| }) | ||
|
|
||
| func TestTemplateFuncs(t *testing.T) { | ||
| t.Run("arithmetic", testArithmeticFuncs) | ||
| } |