/
funcs.go
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/
funcs.go
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/*
* Copyright 2018-2019, CS Systemes d'Information, http://www.c-s.fr
*
* 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 template
import (
"reflect"
txttmpl "text/template"
)
// FuncMap defines the custom functions to be used in templates
var FuncMap = txttmpl.FuncMap{
"inc": func(i int) int { return i + 1 },
"empty": empty,
"notempty": func(given interface{}) bool { return !empty(given) },
}
func empty(param interface{}) bool {
g := reflect.ValueOf(param)
if !g.IsValid() {
return true
}
// Basically adapted from text/template.isTrue
switch g.Kind() {
default:
return g.IsNil()
case reflect.Array, reflect.Slice, reflect.Map, reflect.String:
return g.Len() == 0
case reflect.Bool:
return g.Bool() == false
case reflect.Complex64, reflect.Complex128:
return g.Complex() == 0
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return g.Int() == 0
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return g.Uint() == 0
case reflect.Float32, reflect.Float64:
return g.Float() == 0
case reflect.Struct:
return false
}
}
// MergeFuncs merges the template functions passed as parameter with FuncMap content
// If overwrite is true, will overwrite any existing entry
func MergeFuncs(funcs map[string]interface{}, overwrite bool) map[string]interface{} {
if funcs != nil {
for k, v := range FuncMap {
_, ok := funcs[k]
if !ok || overwrite {
funcs[k] = v
}
}
return funcs
}
return FuncMap
}