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Fixes #4685
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| // Copyright 2018 The Hugo Authors. All rights reserved. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package math | ||
|
|
||
| import ( | ||
| "errors" | ||
| "reflect" | ||
| ) | ||
|
|
||
| // DoArithmetic performs arithmetic operations (+,-,*,/) using reflection to | ||
| // determine the type of the two terms. | ||
| func DoArithmetic(a, b interface{}, op rune) (interface{}, error) { | ||
| av := reflect.ValueOf(a) | ||
| bv := reflect.ValueOf(b) | ||
| var ai, bi int64 | ||
| var af, bf float64 | ||
| var au, bu uint64 | ||
| switch av.Kind() { | ||
| case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: | ||
| ai = av.Int() | ||
| switch bv.Kind() { | ||
| case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: | ||
| bi = bv.Int() | ||
| case reflect.Float32, reflect.Float64: | ||
| af = float64(ai) // may overflow | ||
| ai = 0 | ||
| bf = bv.Float() | ||
| case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64: | ||
| bu = bv.Uint() | ||
| if ai >= 0 { | ||
| au = uint64(ai) | ||
| ai = 0 | ||
| } else { | ||
| bi = int64(bu) // may overflow | ||
| bu = 0 | ||
| } | ||
| default: | ||
| return nil, errors.New("Can't apply the operator to the values") | ||
| } | ||
| case reflect.Float32, reflect.Float64: | ||
| af = av.Float() | ||
| switch bv.Kind() { | ||
| case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: | ||
| bf = float64(bv.Int()) // may overflow | ||
| case reflect.Float32, reflect.Float64: | ||
| bf = bv.Float() | ||
| case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64: | ||
| bf = float64(bv.Uint()) // may overflow | ||
| default: | ||
| return nil, errors.New("Can't apply the operator to the values") | ||
| } | ||
| case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64: | ||
| au = av.Uint() | ||
| switch bv.Kind() { | ||
| case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: | ||
| bi = bv.Int() | ||
| if bi >= 0 { | ||
| bu = uint64(bi) | ||
| bi = 0 | ||
| } else { | ||
| ai = int64(au) // may overflow | ||
| au = 0 | ||
| } | ||
| case reflect.Float32, reflect.Float64: | ||
| af = float64(au) // may overflow | ||
| au = 0 | ||
| bf = bv.Float() | ||
| case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64: | ||
| bu = bv.Uint() | ||
| default: | ||
| return nil, errors.New("Can't apply the operator to the values") | ||
| } | ||
| case reflect.String: | ||
| as := av.String() | ||
| if bv.Kind() == reflect.String && op == '+' { | ||
| bs := bv.String() | ||
| return as + bs, nil | ||
| } | ||
| return nil, errors.New("Can't apply the operator to the values") | ||
| default: | ||
| return nil, errors.New("Can't apply the operator to the values") | ||
| } | ||
|
|
||
| switch op { | ||
| case '+': | ||
| if ai != 0 || bi != 0 { | ||
| return ai + bi, nil | ||
| } else if af != 0 || bf != 0 { | ||
| return af + bf, nil | ||
| } else if au != 0 || bu != 0 { | ||
| return au + bu, nil | ||
| } | ||
| return 0, nil | ||
| case '-': | ||
| if ai != 0 || bi != 0 { | ||
| return ai - bi, nil | ||
| } else if af != 0 || bf != 0 { | ||
| return af - bf, nil | ||
| } else if au != 0 || bu != 0 { | ||
| return au - bu, nil | ||
| } | ||
| return 0, nil | ||
| case '*': | ||
| if ai != 0 || bi != 0 { | ||
| return ai * bi, nil | ||
| } else if af != 0 || bf != 0 { | ||
| return af * bf, nil | ||
| } else if au != 0 || bu != 0 { | ||
| return au * bu, nil | ||
| } | ||
| return 0, nil | ||
| case '/': | ||
| if bi != 0 { | ||
| return ai / bi, nil | ||
| } else if bf != 0 { | ||
| return af / bf, nil | ||
| } else if bu != 0 { | ||
| return au / bu, nil | ||
| } | ||
| return nil, errors.New("Can't divide the value by 0") | ||
| default: | ||
| return nil, errors.New("There is no such an operation") | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| // Copyright 2018 The Hugo Authors. All rights reserved. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package math | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "testing" | ||
|
|
||
| "github.com/alecthomas/assert" | ||
| "github.com/stretchr/testify/require" | ||
| ) | ||
|
|
||
| func TestDoArithmetic(t *testing.T) { | ||
| t.Parallel() | ||
|
|
||
| for i, test := range []struct { | ||
| a interface{} | ||
| b interface{} | ||
| op rune | ||
| expect interface{} | ||
| }{ | ||
| {3, 2, '+', int64(5)}, | ||
| {3, 2, '-', int64(1)}, | ||
| {3, 2, '*', int64(6)}, | ||
| {3, 2, '/', int64(1)}, | ||
| {3.0, 2, '+', float64(5)}, | ||
| {3.0, 2, '-', float64(1)}, | ||
| {3.0, 2, '*', float64(6)}, | ||
| {3.0, 2, '/', float64(1.5)}, | ||
| {3, 2.0, '+', float64(5)}, | ||
| {3, 2.0, '-', float64(1)}, | ||
| {3, 2.0, '*', float64(6)}, | ||
| {3, 2.0, '/', float64(1.5)}, | ||
| {3.0, 2.0, '+', float64(5)}, | ||
| {3.0, 2.0, '-', float64(1)}, | ||
| {3.0, 2.0, '*', float64(6)}, | ||
| {3.0, 2.0, '/', float64(1.5)}, | ||
| {uint(3), uint(2), '+', uint64(5)}, | ||
| {uint(3), uint(2), '-', uint64(1)}, | ||
| {uint(3), uint(2), '*', uint64(6)}, | ||
| {uint(3), uint(2), '/', uint64(1)}, | ||
| {uint(3), 2, '+', uint64(5)}, | ||
| {uint(3), 2, '-', uint64(1)}, | ||
| {uint(3), 2, '*', uint64(6)}, | ||
| {uint(3), 2, '/', uint64(1)}, | ||
| {3, uint(2), '+', uint64(5)}, | ||
| {3, uint(2), '-', uint64(1)}, | ||
| {3, uint(2), '*', uint64(6)}, | ||
| {3, uint(2), '/', uint64(1)}, | ||
| {uint(3), -2, '+', int64(1)}, | ||
| {uint(3), -2, '-', int64(5)}, | ||
| {uint(3), -2, '*', int64(-6)}, | ||
| {uint(3), -2, '/', int64(-1)}, | ||
| {-3, uint(2), '+', int64(-1)}, | ||
| {-3, uint(2), '-', int64(-5)}, | ||
| {-3, uint(2), '*', int64(-6)}, | ||
| {-3, uint(2), '/', int64(-1)}, | ||
| {uint(3), 2.0, '+', float64(5)}, | ||
| {uint(3), 2.0, '-', float64(1)}, | ||
| {uint(3), 2.0, '*', float64(6)}, | ||
| {uint(3), 2.0, '/', float64(1.5)}, | ||
| {3.0, uint(2), '+', float64(5)}, | ||
| {3.0, uint(2), '-', float64(1)}, | ||
| {3.0, uint(2), '*', float64(6)}, | ||
| {3.0, uint(2), '/', float64(1.5)}, | ||
| {0, 0, '+', 0}, | ||
| {0, 0, '-', 0}, | ||
| {0, 0, '*', 0}, | ||
| {"foo", "bar", '+', "foobar"}, | ||
| {3, 0, '/', false}, | ||
| {3.0, 0, '/', false}, | ||
| {3, 0.0, '/', false}, | ||
| {uint(3), uint(0), '/', false}, | ||
| {3, uint(0), '/', false}, | ||
| {-3, uint(0), '/', false}, | ||
| {uint(3), 0, '/', false}, | ||
| {3.0, uint(0), '/', false}, | ||
| {uint(3), 0.0, '/', false}, | ||
| {3, "foo", '+', false}, | ||
| {3.0, "foo", '+', false}, | ||
| {uint(3), "foo", '+', false}, | ||
| {"foo", 3, '+', false}, | ||
| {"foo", "bar", '-', false}, | ||
| {3, 2, '%', false}, | ||
| } { | ||
| errMsg := fmt.Sprintf("[%d] %v", i, test) | ||
|
|
||
| result, err := DoArithmetic(test.a, test.b, test.op) | ||
|
|
||
| if b, ok := test.expect.(bool); ok && !b { | ||
| require.Error(t, err, errMsg) | ||
| continue | ||
| } | ||
|
|
||
| require.NoError(t, err, errMsg) | ||
| assert.Equal(t, test.expect, result, errMsg) | ||
| } | ||
| } |
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