146 lines
2.8 KiB
Go
146 lines
2.8 KiB
Go
package h
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import (
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"fmt"
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"strings"
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"time"
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)
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const FlagSkip = "skip"
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const FlagText = "text"
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const FlagRaw = "raw"
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const FlagAttributeList = "x-attribute-list"
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const FlagChildrenList = "x-children-list"
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type Builder struct {
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builder *strings.Builder
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root *Node
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}
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func (page Builder) render() {
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page.renderNode(page.root)
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}
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func insertAttribute(node *Node, name string, value string) {
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existing := node.attributes[name]
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if existing != "" {
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node.attributes[name] = existing + " " + value
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} else {
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node.attributes[name] = value
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}
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}
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func (page Builder) renderNode(node *Node) {
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if node.tag != "" {
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page.builder.WriteString(fmt.Sprintf("<%s", node.tag))
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index := 0
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if node.attributes == nil {
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node.attributes = map[string]string{}
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}
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flatChildren := make([]Renderable, 0)
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for _, child := range node.children {
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c := child.Render()
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flatChildren = append(flatChildren, child)
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if c.tag == FlagChildrenList {
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for _, gc := range c.children {
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flatChildren = append(flatChildren, gc)
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}
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c.tag = FlagSkip
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}
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}
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if len(flatChildren) > 0 {
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node.children = flatChildren
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}
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for _, child := range node.children {
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if child == nil {
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continue
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}
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c := child.Render()
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if c.tag == "class" {
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insertAttribute(node, "class", c.value)
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c.tag = FlagSkip
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}
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if c.tag == FlagAttributeList {
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for _, gc := range c.children {
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gcr := gc.Render()
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for key, value := range gcr.attributes {
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insertAttribute(node, key, value)
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}
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gcr.tag = FlagSkip
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}
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c.tag = FlagSkip
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}
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if c.tag == "attribute" {
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for key, value := range c.attributes {
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insertAttribute(node, key, value)
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}
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c.tag = FlagSkip
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}
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}
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for key, value := range node.attributes {
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if index == 0 {
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page.builder.WriteString(" ")
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}
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page.builder.WriteString(key)
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page.builder.WriteString("=")
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page.builder.WriteRune('"')
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page.builder.WriteString(value)
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page.builder.WriteRune('"')
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if index < len(node.attributes) {
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page.builder.WriteRune(' ')
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}
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index += 1
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}
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page.builder.WriteString(">")
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if node.text != "" {
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page.builder.WriteString(node.text)
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}
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}
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for _, child := range node.children {
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if child == nil {
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continue
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}
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c := child.Render()
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if c.tag == FlagText {
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page.builder.WriteString(c.text)
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continue
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}
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if c.tag == FlagRaw {
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page.builder.WriteString(c.value)
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continue
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}
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if c.tag != FlagSkip {
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page.renderNode(c)
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}
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}
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if node.tag != "" {
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page.builder.WriteString(fmt.Sprintf("</%s>", node.tag))
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}
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}
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func Render(node Renderable) string {
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start := time.Now()
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builder := strings.Builder{}
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page := Builder{
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builder: &builder,
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root: node.Render(),
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}
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page.render()
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d := page.builder.String()
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duration := time.Since(start)
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fmt.Printf("render took %d\n", duration.Microseconds())
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return d
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}
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