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4 changed files with 46 additions and 1 deletions
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@ -3,7 +3,7 @@ title: Math
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description: Hugo provides mathematical operators in templates.
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description: Hugo provides mathematical operators in templates.
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date: 2017-02-01
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date: 2017-02-01
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publishdate: 2017-02-01
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publishdate: 2017-02-01
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lastmod: 2023-03-11
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lastmod: 2023-05-15
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keywords: [math, operators]
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keywords: [math, operators]
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categories: [functions]
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categories: [functions]
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menu:
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menu:
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@ -31,6 +31,7 @@ aliases: []
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| | *If one of the numbers is a float, the result is a float.* | `{{ div 6 4.0 }}` → `1.5` |
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| | *If one of the numbers is a float, the result is a float.* | `{{ div 6 4.0 }}` → `1.5` |
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| `mod` | Modulus of two integers. | `{{ mod 15 3 }}` → `0` |
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| `mod` | Modulus of two integers. | `{{ mod 15 3 }}` → `0` |
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| `modBool` | Boolean of modulus of two integers. Evaluates to `true` if result equals 0. | `{{ modBool 15 3 }}` → `true` |
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| `modBool` | Boolean of modulus of two integers. Evaluates to `true` if result equals 0. | `{{ modBool 15 3 }}` → `true` |
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| `math.Abs` | Returns the absolute value of the given number. | `{{ math.Abs -2.1 }}` → `2.1` |
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| `math.Ceil` | Returns the least integer value greater than or equal to the given number. | `{{ math.Ceil 2.1 }}` → `3` |
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| `math.Ceil` | Returns the least integer value greater than or equal to the given number. | `{{ math.Ceil 2.1 }}` → `3` |
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| `math.Floor` | Returns the greatest integer value less than or equal to the given number. | `{{ math.Floor 1.9 }}` → `1` |
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| `math.Floor` | Returns the greatest integer value less than or equal to the given number. | `{{ math.Floor 1.9 }}` → `1` |
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| `math.Log` | Returns the natural logarithm of the given number. | `{{ math.Log 42 }}` → `3.737` |
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| `math.Log` | Returns the natural logarithm of the given number. | `{{ math.Log 42 }}` → `3.737` |
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@ -31,6 +31,13 @@ func init() {
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Context: func(cctx context.Context, args ...any) (any, error) { return ctx, nil },
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Context: func(cctx context.Context, args ...any) (any, error) { return ctx, nil },
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}
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}
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ns.AddMethodMapping(ctx.Abs,
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nil,
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[][2]string{
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{"{{ math.Abs -2.1 }}", "2.1"},
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},
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)
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ns.AddMethodMapping(ctx.Add,
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ns.AddMethodMapping(ctx.Add,
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[]string{"add"},
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[]string{"add"},
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[][2]string{
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[][2]string{
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@ -35,6 +35,16 @@ func New() *Namespace {
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// Namespace provides template functions for the "math" namespace.
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// Namespace provides template functions for the "math" namespace.
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type Namespace struct{}
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type Namespace struct{}
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// Abs returns the absolute value of n.
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func (ns *Namespace) Abs(n any) (float64, error) {
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af, err := cast.ToFloat64E(n)
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if err != nil {
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return 0, errors.New("the math.Abs function requires a numeric argument")
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}
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return math.Abs(af), nil
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}
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// Add adds the multivalued addends n1 and n2 or more values.
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// Add adds the multivalued addends n1 and n2 or more values.
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func (ns *Namespace) Add(inputs ...any) (any, error) {
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func (ns *Namespace) Add(inputs ...any) (any, error) {
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return ns.doArithmetic(inputs, '+')
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return ns.doArithmetic(inputs, '+')
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@ -63,6 +63,33 @@ func TestBasicNSArithmetic(t *testing.T) {
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}
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}
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}
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}
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func TestAbs(t *testing.T) {
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t.Parallel()
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c := qt.New(t)
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ns := New()
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for _, test := range []struct {
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x any
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expect any
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}{
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{0.0, 0.0},
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{1.5, 1.5},
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{-1.5, 1.5},
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{-2, 2.0},
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{"abc", false},
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} {
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result, err := ns.Abs(test.x)
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if b, ok := test.expect.(bool); ok && !b {
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c.Assert(err, qt.Not(qt.IsNil))
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continue
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}
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c.Assert(err, qt.IsNil)
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c.Assert(result, qt.Equals, test.expect)
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}
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}
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func TestCeil(t *testing.T) {
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func TestCeil(t *testing.T) {
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t.Parallel()
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t.Parallel()
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c := qt.New(t)
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c := qt.New(t)
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