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concat.go
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concat.go
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/*
* Copyright 2021-2022 by Nedim Sabic Sabic
* https://www.fibratus.io
* 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 functions
import (
"fmt"
"strconv"
"strings"
)
// Concat returns a concatenated string of all input arguments.
type Concat struct{}
func (f Concat) Call(args []interface{}) (interface{}, bool) {
if len(args) < 2 {
return false, false
}
var sb strings.Builder
for _, arg := range args {
switch s := arg.(type) {
case string:
sb.WriteString(s)
case int:
sb.WriteString(strconv.FormatInt(int64(s), 10))
case uint:
sb.WriteString(strconv.FormatInt(int64(s), 10))
case int8:
sb.WriteString(strconv.FormatInt(int64(s), 10))
case uint8:
sb.WriteString(strconv.FormatInt(int64(s), 10))
case int16:
sb.WriteString(strconv.FormatInt(int64(s), 10))
case uint16:
sb.WriteString(strconv.FormatInt(int64(s), 10))
case int32:
sb.WriteString(strconv.FormatInt(int64(s), 10))
case uint32:
sb.WriteString(strconv.FormatInt(int64(s), 10))
case int64:
sb.WriteString(strconv.FormatInt(s, 10))
case uint64:
sb.WriteString(strconv.FormatInt(int64(s), 10))
}
}
return sb.String(), true
}
func (f Concat) Desc() FunctionDesc {
desc := FunctionDesc{
Name: ConcatFn,
Args: []FunctionArgDesc{
{Keyword: "string1", Types: []ArgType{String, Number, Field, Func}, Required: true},
{Keyword: "string2", Types: []ArgType{String, Number, Field, Func}, Required: true},
},
}
offset := len(desc.Args)
// add optional arguments
for i := offset; i < maxArgs; i++ {
desc.Args = append(desc.Args, FunctionArgDesc{Keyword: fmt.Sprintf("string%d", i+1), Types: []ArgType{String, Number, Field, Func}})
}
return desc
}
func (f Concat) Name() Fn { return ConcatFn }