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html.go
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html.go
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// Copyright 2020 The nfgo Authors. 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 ntemplate
import (
"html/template"
"io/fs"
"strings"
"github.com/Masterminds/sprig/v3"
"github.com/nf-go/nfgo/nlog"
)
// HTMLTemplate - HTMLTemplate is the representation of a parsed html template,
// and add the sprig(http://masterminds.github.io/sprig/) functions to template's function map.
type HTMLTemplate struct {
tmpl *template.Template
}
// ParseHTMLTemplate -
func ParseHTMLTemplate(fs fs.FS, patterns ...string) (*HTMLTemplate, error) {
tmpl, err := template.New("$base").Funcs(sprig.FuncMap()).ParseFS(fs, patterns...)
if err != nil {
return nil, err
}
return &HTMLTemplate{
tmpl: tmpl,
}, nil
}
// MustParseHTMLTemplate -
func MustParseHTMLTemplate(fs fs.FS, patterns ...string) *HTMLTemplate {
t, err := ParseHTMLTemplate(fs, patterns...)
if err != nil {
nlog.Fatal("fail to parse html template: ", err)
}
return t
}
// NewHTMLTemplate -
func NewHTMLTemplate(name, text string) (*HTMLTemplate, error) {
tmpl, err := template.New(name).Funcs(sprig.FuncMap()).Parse(text)
if err != nil {
return nil, err
}
return &HTMLTemplate{
tmpl: tmpl,
}, nil
}
// MustNewHTMLTemplate -
func MustNewHTMLTemplate(name, text string) *HTMLTemplate {
t, err := NewHTMLTemplate(name, text)
if err != nil {
nlog.Fatal("fail to create html template: ", err)
}
return t
}
// Lookup returns the template with the given name that is associated with t,
// or nil if there is no such template.
func (t *HTMLTemplate) Lookup(name string) *HTMLTemplate {
tmpl := t.tmpl.Lookup(name)
if tmpl == nil {
return nil
}
return &HTMLTemplate{
tmpl: tmpl,
}
}
// Execute - applies the template to the specified data object
func (t *HTMLTemplate) Execute(data interface{}) (string, error) {
var sb strings.Builder
if err := t.tmpl.Execute(&sb, data); err != nil {
return "", err
}
return sb.String(), nil
}
// ExecuteTemplate - applies the template associated with t that has the given name to the specified data object
func (t *HTMLTemplate) ExecuteTemplate(name string, data interface{}) (string, error) {
var sb strings.Builder
if err := t.tmpl.ExecuteTemplate(&sb, name, data); err != nil {
return "", err
}
return sb.String(), nil
}