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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| // Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one | ||
| // or more contributor license agreements. Licensed under the Elastic License; | ||
| // you may not use this file except in compliance with the Elastic License. | ||
|
|
||
| package httpjson | ||
|
|
||
| import ( | ||
| "errors" | ||
| "reflect" | ||
| ) | ||
|
|
||
| // These functions come from Go's text/template/funcs.go (1.19). | ||
| // | ||
| // Copyright 2009 The Go Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file. | ||
|
|
||
| var ( | ||
| errBadComparisonType = errors.New("invalid type for comparison") | ||
| errBadComparison = errors.New("incompatible types for comparison") | ||
| ) | ||
|
|
||
| type kind int | ||
|
|
||
| const ( | ||
| invalidKind kind = iota | ||
| boolKind | ||
| complexKind | ||
| intKind | ||
| floatKind | ||
| stringKind | ||
| uintKind | ||
| ) | ||
|
|
||
| func basicKind(v reflect.Value) (kind, error) { | ||
| switch v.Kind() { | ||
| case reflect.Bool: | ||
| return boolKind, nil | ||
| case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: | ||
| return intKind, nil | ||
| case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr: | ||
| return uintKind, nil | ||
| case reflect.Float32, reflect.Float64: | ||
| return floatKind, nil | ||
| case reflect.Complex64, reflect.Complex128: | ||
| return complexKind, nil | ||
| case reflect.String: | ||
| return stringKind, nil | ||
| } | ||
| return invalidKind, errBadComparisonType | ||
| } | ||
|
|
||
| // indirectInterface returns the concrete value in an interface value, | ||
| // or else the zero reflect.Value. | ||
| // That is, if v represents the interface value x, the result is the same as reflect.ValueOf(x): | ||
| // the fact that x was an interface value is forgotten. | ||
| func indirectInterface(v reflect.Value) reflect.Value { | ||
| if v.Kind() != reflect.Interface { | ||
| return v | ||
| } | ||
| if v.IsNil() { | ||
| return reflect.Value{} | ||
| } | ||
| return v.Elem() | ||
| } | ||
|
|
||
| // lt evaluates the comparison a < b. | ||
| func lt(arg1, arg2 reflect.Value) (bool, error) { | ||
| arg1 = indirectInterface(arg1) | ||
| k1, err := basicKind(arg1) | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
| arg2 = indirectInterface(arg2) | ||
| k2, err := basicKind(arg2) | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
| truth := false | ||
| if k1 != k2 { | ||
| // Special case: Can compare integer values regardless of type's sign. | ||
| switch { | ||
| case k1 == intKind && k2 == uintKind: | ||
| truth = arg1.Int() < 0 || uint64(arg1.Int()) < arg2.Uint() | ||
| case k1 == uintKind && k2 == intKind: | ||
| truth = arg2.Int() >= 0 && arg1.Uint() < uint64(arg2.Int()) | ||
| default: | ||
| return false, errBadComparison | ||
| } | ||
| } else { | ||
| switch k1 { | ||
| case boolKind, complexKind: | ||
| return false, errBadComparisonType | ||
| case floatKind: | ||
| truth = arg1.Float() < arg2.Float() | ||
| case intKind: | ||
| truth = arg1.Int() < arg2.Int() | ||
| case stringKind: | ||
| truth = arg1.String() < arg2.String() | ||
| case uintKind: | ||
| truth = arg1.Uint() < arg2.Uint() | ||
| default: | ||
| panic("invalid kind") | ||
| } | ||
| } | ||
| return truth, nil | ||
| } |
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