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func.go
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func.go
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// Copyright 2017 Thibault Chataigner <thibault.chataigner@gmail.com>
// 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 (
"errors"
"fmt"
"reflect"
"regexp"
"strings"
"text/template"
)
func replace(input interface{}, from, to string) (string, error) {
if input == nil {
return "", errors.New("input does not exist, cannot replace")
}
return strings.Replace(input.(string), from, to, -1), nil
}
func split(input interface{}, delimiter string) ([]string, error) {
return strings.Split(input.(string), delimiter), nil
}
// isSet indicate is a field is defined in the template data
func isSet(v interface{}, name string) bool {
rv := reflect.ValueOf(v)
if rv.Kind() == reflect.Ptr {
rv = rv.Elem()
}
if rv.Kind() != reflect.Struct {
return false
}
return rv.FieldByName(name).IsValid()
}
func replaceRegex(input interface{}, matcher, replaceWith string) (string, error) {
rx, err := rexGet(matcher)
if err != nil {
return "", fmt.Errorf("failed to parse incoming regex string: %v", err)
}
return rx.ReplaceAllString(input.(string), replaceWith), nil
}
// TmplFuncMap expose custom go template functions
var TmplFuncMap = template.FuncMap{
"replace": replace,
"split": split,
"isSet": isSet,
"replaceRegex": replaceRegex,
}
// singleton to hold the expensive Compile operation results
var matchersMap = make(map[string]*regexp.Regexp)
func rexGet(m string) (*regexp.Regexp, error) {
if r, ok := matchersMap[m]; ok {
return r, nil
}
rx, err := regexp.Compile(m)
if err != nil {
return nil, err
}
matchersMap[m] = rx
return rx, nil
}