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package stdlib
import (
"fmt"
"github.com/zclconf/go-cty/cty"
"github.com/zclconf/go-cty/cty/convert"
"github.com/zclconf/go-cty/cty/function"
)
var EqualFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "a",
Type: cty.DynamicPseudoType,
AllowUnknown: true,
AllowDynamicType: true,
AllowNull: true,
},
{
Name: "b",
Type: cty.DynamicPseudoType,
AllowUnknown: true,
AllowDynamicType: true,
AllowNull: true,
},
},
Type: function.StaticReturnType(cty.Bool),
Impl: func(args []cty.Value, retType cty.Type) (ret cty.Value, err error) {
return args[0].Equals(args[1]), nil
},
})
var NotEqualFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "a",
Type: cty.DynamicPseudoType,
AllowUnknown: true,
AllowDynamicType: true,
AllowNull: true,
},
{
Name: "b",
Type: cty.DynamicPseudoType,
AllowUnknown: true,
AllowDynamicType: true,
AllowNull: true,
},
},
Type: function.StaticReturnType(cty.Bool),
Impl: func(args []cty.Value, retType cty.Type) (ret cty.Value, err error) {
return args[0].Equals(args[1]).Not(), nil
},
})
var CoalesceFunc = function.New(&function.Spec{
Params: []function.Parameter{},
VarParam: &function.Parameter{
Name: "vals",
Type: cty.DynamicPseudoType,
AllowUnknown: true,
AllowDynamicType: true,
AllowNull: true,
},
Type: func(args []cty.Value) (ret cty.Type, err error) {
argTypes := make([]cty.Type, len(args))
for i, val := range args {
argTypes[i] = val.Type()
}
retType, _ := convert.UnifyUnsafe(argTypes)
if retType == cty.NilType {
return cty.NilType, fmt.Errorf("all arguments must have the same type")
}
return retType, nil
},
Impl: func(args []cty.Value, retType cty.Type) (ret cty.Value, err error) {
for _, argVal := range args {
if !argVal.IsKnown() {
return cty.UnknownVal(retType), nil
}
if argVal.IsNull() {
continue
}
return convert.Convert(argVal, retType)
}
return cty.NilVal, fmt.Errorf("no non-null arguments")
},
})
// Equal determines whether the two given values are equal, returning a
// bool value.
func Equal(a cty.Value, b cty.Value) (cty.Value, error) {
return EqualFunc.Call([]cty.Value{a, b})
}
// NotEqual is the opposite of Equal.
func NotEqual(a cty.Value, b cty.Value) (cty.Value, error) {
return NotEqualFunc.Call([]cty.Value{a, b})
}
// Coalesce returns the first of the given arguments that is not null. If
// all arguments are null, an error is produced.
func Coalesce(vals ...cty.Value) (cty.Value, error) {
return CoalesceFunc.Call(vals)
}
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