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builder.go
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builder.go
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// Copyright (c) 2023 The Go-Curses Authors
//
// 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 ctk
import (
"encoding/xml"
"fmt"
"strconv"
"strings"
"github.com/go-curses/ctk/lib/enums"
"github.com/iancoleman/strcase"
"github.com/go-curses/cdk"
cstrings "github.com/go-curses/cdk/lib/strings"
"github.com/go-curses/cdk/log"
)
type BuilderTranslationFn = func(builder Builder, widget Widget, name, value string) error
var ctkBuilderTranslators map[cdk.TypeTag]BuilderTranslationFn
func init() {
ctkBuilderTranslators = make(map[cdk.TypeTag]BuilderTranslationFn)
}
func BuilderRegisterConstructor(tag cdk.TypeTag, fn BuilderTranslationFn) {
if _, ok := ctkBuilderTranslators[tag]; ok {
log.WarnF("overwriting existing NewObject constructor for %v objects", tag)
}
ctkBuilderTranslators[tag] = fn
}
const TypeBuilder cdk.CTypeTag = "ctk-builder"
func init() {
_ = cdk.TypesManager.AddType(TypeBuilder, nil)
}
type Builder interface {
cdk.Object
Init() (already bool)
BuildableTypeTags() map[string]cdk.TypeTag
LookupNamedSignalHandler(name string) (fn cdk.SignalListenerFn)
AddNamedSignalHandler(name string, fn cdk.SignalListenerFn)
GetWidget(name string) (w interface{})
GetWidgetsBuiltByType(tag cdk.CTypeTag) (widgets []interface{})
ParsePacking(packing *CBuilderElement) (expand, fill bool, padding int, packType enums.PackType)
LoadFromString(raw string) (topElement *CBuilderElement, err error)
Build(element *CBuilderElement) (newObject interface{})
}
type CBuilder struct {
cdk.CObject
handlers map[string]cdk.SignalListenerFn
objects []*CBuilderElement
buildable map[string]cdk.TypeTag
built []interface{}
}
func NewBuilder() (builder Builder) {
builder = &CBuilder{}
_ = builder.Init()
return
}
func (b *CBuilder) Init() (already bool) {
if b.InitTypeItem(TypeBuilder, b) {
return true
}
b.CObject.Init()
b.buildable = cdk.TypesManager.GetBuildableInfo()
b.handlers = make(map[string]cdk.SignalListenerFn)
b.built = make([]interface{}, 0)
return
}
func (b *CBuilder) BuildableTypeTags() map[string]cdk.TypeTag {
return b.buildable
}
func (b *CBuilder) LookupNamedSignalHandler(name string) (fn cdk.SignalListenerFn) {
fn, _ = b.handlers[name]
return
}
func (b *CBuilder) AddNamedSignalHandler(name string, fn cdk.SignalListenerFn) {
if _, ok := b.handlers[name]; ok {
b.LogWarn("overwriting existing handler: %v", name)
}
log.DebugDF(1, "adding handler: %v", name)
b.handlers[name] = fn
}
func (b *CBuilder) GetWidget(name string) (w interface{}) {
w = cdk.TypesManager.GetTypeItemByName(name)
log.DebugDF(1, "GetWidget(%v) = %v", name, w)
return
}
func (b *CBuilder) GetWidgetsBuiltByType(tag cdk.CTypeTag) (widgets []interface{}) {
widgets = make([]interface{}, 0)
for _, object := range b.built {
if wo, ok := object.(Widget); ok {
if wo.GetTypeTag().Equals(tag) {
widgets = append(widgets, object)
}
}
}
return
}
func (b *CBuilder) ParsePacking(packing *CBuilderElement) (expand, fill bool, padding int, packType enums.PackType) {
expand, fill = false, true
padding = 0
packType = enums.PackStart
for k, v := range packing.Packing {
switch k {
case "expand":
expand = cstrings.IsTrue(v)
case "fill":
fill = cstrings.IsTrue(v)
case "padding":
var err error
if padding, err = strconv.Atoi(v); err != nil {
b.LogErr(err)
padding = 0
}
case "pack-type":
switch strings.ToLower(v) {
case "start":
case "end":
packType = enums.PackEnd
default:
b.LogError("invalid pack-type given: %v, must be either start or end")
}
}
}
return
}
func (b *CBuilder) LoadFromString(raw string) (topElement *CBuilderElement, err error) {
b.LogDebug("known buildable types: %v", b.buildable)
r := strings.NewReader(raw)
parser := xml.NewDecoder(r)
var n BuilderNode
if err = parser.Decode(&n); err != nil {
return nil, err
}
topElement = b.walkElements(n)
b.LogDebug("see report:\n[report]\n%v[/report]", b.report(0, topElement))
_ = b.Build(topElement)
return topElement, nil
}
func (b *CBuilder) Build(element *CBuilderElement) (newObject interface{}) {
switch element.TagName {
case "requires":
case "ctk-builder", "interface":
if len(element.Children) > 0 {
for _, child := range element.Children {
newObject = b.Build(child)
child.Instance = newObject
}
}
case "object":
if class, ok := element.Attributes["class"]; ok {
if tt, ok := b.buildable[class]; ok {
ct, _ := cdk.TypesManager.GetType(tt)
newObject = ct.New()
b.built = append(b.built, newObject)
var newBuildable Buildable
var ok bool
if newBuildable, ok = newObject.(Buildable); !ok {
b.LogError("new object is not a Buildable type: %v (%T)", newObject, newObject)
newObject = nil
break
}
element.Instance = newObject
if newWidget, ok := newBuildable.(Widget); ok {
newWidget.Show()
}
if err := newBuildable.Build(b, element); err != nil {
b.LogErr(err)
}
} else {
b.LogError("ctk class not implemented: %v", class)
}
}
default:
b.LogError("unexpected element type: %v", element.TagName)
}
return
}
func (b *CBuilder) report(depth int, element *CBuilderElement) (output string) {
pad := ""
for i := 0; i < depth; i++ {
pad += "\t"
}
nChildren := len(element.Children)
properties := ""
for k, v := range element.Properties {
if len(properties) > 0 {
properties += " "
}
properties += k + "=\"" + v + "\""
}
for k, v := range element.Attributes {
if len(properties) > 0 {
properties += " "
}
properties += k + "=\"" + v + "\""
}
switch element.TagName {
case "requires":
output += fmt.Sprintf("%v<requires %v/>\n", pad, properties)
case "ctk-builder", "interface":
output += fmt.Sprintf("%v<ctk-builder>", pad)
if nChildren > 0 {
output += "\n"
for _, child := range element.Children {
output += b.report(depth+1, child)
}
}
output += fmt.Sprintf("%v</ctk-builder>\n", pad)
case "object":
if class, ok := element.Attributes["class"]; ok {
if name, ok := element.Attributes["id"]; ok {
if len(properties) > 0 {
properties = fmt.Sprintf(`name="%v" %v`, name, properties)
} else {
properties = fmt.Sprintf(`name="%v"`, name)
}
}
if nChildren > 0 {
output += fmt.Sprintf("%v<%v %v>\n", pad, class, properties)
for _, child := range element.Children {
output += b.report(depth+1, child)
}
output += fmt.Sprintf("%v</%v>\n", pad, class)
} else {
output += fmt.Sprintf("%v<%v %v/>\n", pad, class, properties)
}
}
default:
output += fmt.Sprintf("%v<!-- unexpected tag: %v -->\n", pad, element.TagName)
}
return
}
func (b *CBuilder) walkElements(n BuilderNode, argv ...interface{}) (be *CBuilderElement) {
if n.XMLName.Local == "object" {
return b.walkObject(n)
}
be = newBuilderElement(n.XMLName.Local, b)
be.Attributes = b.parseTagAttributes(n.Attrs)
be.Content = string(n.Content)
for _, cn := range n.Nodes {
switch cn.XMLName.Local {
case "object":
if cbe := b.walkObject(cn); cbe != nil {
be.Children = append(be.Children, cbe)
}
default:
if cbe := b.walkElements(cn, argv...); cbe != nil {
be.Children = append(be.Children, cbe)
}
}
}
return
}
func (b *CBuilder) walkObject(n BuilderNode) (be *CBuilderElement) {
tagStr := fmt.Sprintf("<%v %v>%v</%v>", n.XMLName.Local, n.Attrs, string(n.Content), n.XMLName.Local)
be = newBuilderElement(n.XMLName.Local, b)
be.Attributes = b.parseTagAttributes(n.Attrs)
be.Content = string(n.Content)
for _, cn := range n.Nodes {
switch cn.XMLName.Local {
case "property":
attrs := b.parseTagAttributes(cn.Attrs)
if v, ok := attrs["name"]; ok {
vs := strcase.ToDelimited(v, '-')
be.Properties[vs] = string(cn.Content)
} else {
b.LogError("missing name attribute on property tag: %v", tagStr)
}
case "signal":
attrs := b.parseTagAttributes(cn.Attrs)
if name, ok := attrs["name"]; ok {
if handler, ok := attrs["handler"]; ok {
be.Signals[name] = handler
}
} else {
b.LogError("missing name attribute on property tag: %v", tagStr)
}
case "child":
b.walkObjectChild(cn, be)
default:
b.LogError("ignoring unexpected tag: %v", cn.XMLName.Local)
}
}
return
}
func (b *CBuilder) walkObjectChild(n BuilderNode, parentElement *CBuilderElement) {
var object *CBuilderElement
packing := make(map[string]string)
for _, cn := range n.Nodes {
switch cn.XMLName.Local {
case "object":
if cbe := b.walkObject(cn); cbe != nil {
object = cbe
parentElement.Children = append(
parentElement.Children,
object,
)
}
case "packing":
for _, ccn := range cn.Nodes {
attrs := b.parseTagAttributes(ccn.Attrs)
if v, ok := attrs["name"]; ok {
packing[v] = string(ccn.Content)
}
}
case "placeholder":
return
default:
b.LogError("ignoring unexpected tag: %v", cn.XMLName.Local)
}
}
if object != nil {
for k, v := range packing {
object.Packing[k] = v
}
} else {
b.LogError("object not found in child tag children")
}
return
}
func (b *CBuilder) parseTagAttributes(attrs []xml.Attr) (properties map[string]string) {
properties = make(map[string]string)
for _, attr := range attrs {
properties[attr.Name.Local] = attr.Value
}
return
}
const PropertyID cdk.Property = "id"
const PropertyHandler cdk.Property = "handler"
const PropertySwapped cdk.Property = "swapped"