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package editor
import (
"bytes"
"reflect"
)
// Input returns the []byte of an <input> HTML element with a label.
// IMPORTANT:
// The `fieldName` argument will cause a panic if it is not exactly the string
// form of the struct field that this editor input is representing
func Input(fieldName string, p interface{}, attrs map[string]string) []byte {
e := newElement("input", attrs["label"], fieldName, p, attrs)
return domElementSelfClose(e)
}
// Textarea returns the []byte of a <textarea> HTML element with a label.
// IMPORTANT:
// The `fieldName` argument will cause a panic if it is not exactly the string
// form of the struct field that this editor input is representing
func Textarea(fieldName string, p interface{}, attrs map[string]string) []byte {
e := newElement("textarea", attrs["label"], fieldName, p, attrs)
return domElement(e)
}
type element struct {
TagName string
Attrs map[string]string
Name string
label string
data string
viewBuf *bytes.Buffer
}
// domElementSelfClose is a special DOM element which is parsed as a
// self-closing tag and thus needs to be created differently
func domElementSelfClose(e *element) []byte {
if e.label != "" {
e.viewBuf.Write([]byte(`<label>` + e.label + `</label>`))
}
e.viewBuf.Write([]byte(`<` + e.TagName + ` value="`))
e.viewBuf.Write([]byte(e.data + `" `))
for attr, value := range e.Attrs {
e.viewBuf.Write([]byte(attr + `="` + value + `" `))
}
e.viewBuf.Write([]byte(` name="` + e.Name + `"`))
e.viewBuf.Write([]byte(` />`))
return e.viewBuf.Bytes()
}
// domElement creates a DOM element
func domElement(e *element) []byte {
if e.label != "" {
e.viewBuf.Write([]byte(`<label>` + e.label + `</label>`))
}
e.viewBuf.Write([]byte(`<` + e.TagName + ` `))
for attr, value := range e.Attrs {
e.viewBuf.Write([]byte(attr + `="` + string(value) + `" `))
}
e.viewBuf.Write([]byte(` name="` + e.Name + `"`))
e.viewBuf.Write([]byte(` >`))
e.viewBuf.Write([]byte(e.data))
e.viewBuf.Write([]byte(`</` + e.TagName + `>`))
return e.viewBuf.Bytes()
}
func tagNameFromStructField(name string, post interface{}) string {
field, ok := reflect.TypeOf(post).Elem().FieldByName(name)
if !ok {
panic("Couldn't get struct field for: " + name + ". Make sure you pass the right field name to editor field elements.")
}
tag, ok := field.Tag.Lookup("json")
if !ok {
panic("Couldn't get json struct tag for: " + name + ". Struct fields for content types must have 'json' tags.")
}
return tag
}
func valueFromStructField(name string, post interface{}) string {
field := reflect.Indirect(reflect.ValueOf(post)).FieldByName(name)
return field.String()
}
func newElement(tagName, label, fieldName string, p interface{}, attrs map[string]string) *element {
return &element{
TagName: tagName,
Attrs: attrs,
Name: tagNameFromStructField(fieldName, p),
label: label,
data: valueFromStructField(fieldName, p),
viewBuf: &bytes.Buffer{},
}
}
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