/
condition.go
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/
condition.go
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package app
// Copyright (c) 2018 Bhojpur Consulting Private Limited, India. All rights reserved.
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
import (
"context"
"io"
"net/url"
"github.com/bhojpur/web/pkg/app/errors"
)
// Condition represents a control structure that displays nodes depending on a
// given expression.
type Condition interface {
UI
// ElseIf sets the condition with the given nodes if previous expressions
// were not met and given expression is true.
ElseIf(expr bool, elems ...UI) Condition
// Else sets the condition with the given UI elements if previous
// expressions were not met.
Else(elems ...UI) Condition
}
// If returns a condition that filters the given elements according to the given
// expression.
func If(expr bool, elems ...UI) Condition {
if !expr {
elems = nil
}
return condition{
body: FilterUIElems(elems...),
satisfied: expr,
}
}
type condition struct {
body []UI
satisfied bool
}
func (c condition) ElseIf(expr bool, elems ...UI) Condition {
if c.satisfied {
return c
}
if expr {
c.body = FilterUIElems(elems...)
c.satisfied = expr
}
return c
}
func (c condition) Else(elems ...UI) Condition {
return c.ElseIf(true, elems...)
}
func (c condition) Kind() Kind {
return Selector
}
func (c condition) JSValue() Value {
return nil
}
func (c condition) Mounted() bool {
return false
}
func (c condition) name() string {
return "if.else"
}
func (c condition) self() UI {
return c
}
func (c condition) setSelf(UI) {
}
func (c condition) context() context.Context {
return nil
}
func (c condition) dispatcher() Dispatcher {
return nil
}
func (c condition) attributes() map[string]string {
return nil
}
func (c condition) eventHandlers() map[string]eventHandler {
return nil
}
func (c condition) parent() UI {
return nil
}
func (c condition) setParent(UI) {
}
func (c condition) children() []UI {
return c.body
}
func (c condition) mount(Dispatcher) error {
return errors.New("condition is not mountable").
Tag("name", c.name()).
Tag("kind", c.Kind())
}
func (c condition) dismount() {
}
func (c condition) update(UI) error {
return errors.New("condition cannot be updated").
Tag("name", c.name()).
Tag("kind", c.Kind())
}
func (c condition) onNav(*url.URL) {
}
func (c condition) onAppUpdate() {
}
func (c condition) onAppInstallChange() {
}
func (c condition) onResize() {
}
func (c condition) preRender(Page) {
}
func (c condition) html(w io.Writer) {
panic("shoulnd not be called")
}
func (c condition) htmlWithIndent(w io.Writer, indent int) {
panic("shoulnd not be called")
}