27 lines
984 B
Go
27 lines
984 B
Go
package conf
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import "reflect"
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// OperatorsTable maps binary operators to corresponding list of functions.
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// Functions should be provided in the environment to allow operator overloading.
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type OperatorsTable map[string][]string
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func FindSuitableOperatorOverload(fns []string, types TypesTable, l, r reflect.Type) (reflect.Type, string, bool) {
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for _, fn := range fns {
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fnType := types[fn]
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firstInIndex := 0
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if fnType.Method {
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firstInIndex = 1 // As first argument to method is receiver.
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}
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firstArgType := fnType.Type.In(firstInIndex)
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secondArgType := fnType.Type.In(firstInIndex + 1)
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firstArgumentFit := l == firstArgType || (firstArgType.Kind() == reflect.Interface && (l == nil || l.Implements(firstArgType)))
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secondArgumentFit := r == secondArgType || (secondArgType.Kind() == reflect.Interface && (r == nil || r.Implements(secondArgType)))
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if firstArgumentFit && secondArgumentFit {
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return fnType.Type.Out(0), fn, true
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}
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}
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return nil, "", false
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}
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