mirror of
https://github.com/wavetermdev/waveterm.git
synced 2024-12-22 16:48:23 +01:00
254 lines
5.2 KiB
Go
254 lines
5.2 KiB
Go
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// Copyright 2024, Command Line Inc.
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// SPDX-License-Identifier: Apache-2.0
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package vdom
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import (
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"errors"
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"fmt"
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"io"
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"strings"
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"github.com/wavetermdev/htmltoken"
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)
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// can tokenize and bind HTML to Elems
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func appendChildToStack(stack []*Elem, child *Elem) {
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if child == nil {
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return
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}
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if len(stack) == 0 {
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return
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}
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parent := stack[len(stack)-1]
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parent.Children = append(parent.Children, *child)
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}
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func pushElemStack(stack []*Elem, elem *Elem) []*Elem {
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if elem == nil {
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return stack
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}
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return append(stack, elem)
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}
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func popElemStack(stack []*Elem) []*Elem {
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if len(stack) <= 1 {
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return stack
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}
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curElem := stack[len(stack)-1]
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appendChildToStack(stack[:len(stack)-1], curElem)
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return stack[:len(stack)-1]
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}
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func curElemTag(stack []*Elem) string {
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if len(stack) == 0 {
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return ""
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}
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return stack[len(stack)-1].Tag
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}
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func finalizeStack(stack []*Elem) *Elem {
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if len(stack) == 0 {
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return nil
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}
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for len(stack) > 1 {
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stack = popElemStack(stack)
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}
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rtnElem := stack[0]
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if len(rtnElem.Children) == 0 {
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return nil
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}
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if len(rtnElem.Children) == 1 {
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return &rtnElem.Children[0]
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}
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return rtnElem
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}
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func getAttr(token htmltoken.Token, key string) string {
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for _, attr := range token.Attr {
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if attr.Key == key {
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return attr.Val
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}
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}
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return ""
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}
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func tokenToElem(token htmltoken.Token, data map[string]any) *Elem {
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elem := &Elem{Tag: token.Data}
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if len(token.Attr) > 0 {
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elem.Props = make(map[string]any)
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}
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for _, attr := range token.Attr {
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if attr.Key == "" || attr.Val == "" {
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continue
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}
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if strings.HasPrefix(attr.Val, "#bind:") {
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bindKey := attr.Val[6:]
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bindVal, ok := data[bindKey]
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if !ok {
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continue
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}
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elem.Props[attr.Key] = bindVal
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continue
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}
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elem.Props[attr.Key] = attr.Val
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}
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return elem
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}
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func isWsChar(char rune) bool {
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return char == ' ' || char == '\t' || char == '\n' || char == '\r'
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}
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func isWsByte(char byte) bool {
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return char == ' ' || char == '\t' || char == '\n' || char == '\r'
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}
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func isFirstCharLt(s string) bool {
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for _, char := range s {
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if isWsChar(char) {
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continue
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}
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return char == '<'
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}
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return false
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}
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func isLastCharGt(s string) bool {
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for i := len(s) - 1; i >= 0; i-- {
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char := s[i]
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if isWsByte(char) {
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continue
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}
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return char == '>'
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}
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return false
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}
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func isAllWhitespace(s string) bool {
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for _, char := range s {
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if !isWsChar(char) {
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return false
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}
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}
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return true
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}
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func trimWhitespaceConditionally(s string) string {
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// Trim leading whitespace if the first non-whitespace character is '<'
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if isAllWhitespace(s) {
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return ""
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}
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if isFirstCharLt(s) {
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s = strings.TrimLeftFunc(s, func(r rune) bool {
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return isWsChar(r)
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})
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}
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// Trim trailing whitespace if the last non-whitespace character is '>'
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if isLastCharGt(s) {
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s = strings.TrimRightFunc(s, func(r rune) bool {
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return isWsChar(r)
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})
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}
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return s
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}
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func processWhitespace(htmlStr string) string {
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lines := strings.Split(htmlStr, "\n")
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var newLines []string
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for _, line := range lines {
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trimmedLine := trimWhitespaceConditionally(line + "\n")
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if trimmedLine == "" {
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continue
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}
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newLines = append(newLines, trimmedLine)
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}
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return strings.Join(newLines, "")
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}
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func processTextStr(s string) string {
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if s == "" {
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return ""
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}
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if isAllWhitespace(s) {
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return " "
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}
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return strings.TrimSpace(s)
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}
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func Bind(htmlStr string, data map[string]any) *Elem {
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htmlStr = processWhitespace(htmlStr)
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r := strings.NewReader(htmlStr)
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iter := htmltoken.NewTokenizer(r)
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var elemStack []*Elem
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elemStack = append(elemStack, &Elem{Tag: FragmentTag})
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var tokenErr error
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outer:
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for {
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tokenType := iter.Next()
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token := iter.Token()
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switch tokenType {
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case htmltoken.StartTagToken:
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if token.Data == "bind" {
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tokenErr = errors.New("bind tag must be self closing")
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break outer
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}
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elem := tokenToElem(token, data)
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elemStack = pushElemStack(elemStack, elem)
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case htmltoken.EndTagToken:
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if token.Data == "bind" {
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tokenErr = errors.New("bind tag must be self closing")
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break outer
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}
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if len(elemStack) <= 1 {
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tokenErr = fmt.Errorf("end tag %q without start tag", token.Data)
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break outer
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}
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if curElemTag(elemStack) != token.Data {
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tokenErr = fmt.Errorf("end tag %q does not match start tag %q", token.Data, curElemTag(elemStack))
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break outer
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}
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elemStack = popElemStack(elemStack)
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case htmltoken.SelfClosingTagToken:
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if token.Data == "bind" {
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keyAttr := getAttr(token, "key")
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dataVal := data[keyAttr]
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elemList := partToElems(dataVal)
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for _, elem := range elemList {
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appendChildToStack(elemStack, &elem)
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}
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continue
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}
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elem := tokenToElem(token, data)
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appendChildToStack(elemStack, elem)
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case htmltoken.TextToken:
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if token.Data == "" {
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continue
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}
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textStr := processTextStr(token.Data)
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if textStr == "" {
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continue
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}
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elem := TextElem(textStr)
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appendChildToStack(elemStack, &elem)
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case htmltoken.CommentToken:
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continue
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case htmltoken.DoctypeToken:
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tokenErr = errors.New("doctype not supported")
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break outer
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case htmltoken.ErrorToken:
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if iter.Err() == io.EOF {
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break outer
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}
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tokenErr = iter.Err()
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break outer
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}
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}
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if tokenErr != nil {
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errTextElem := TextElem(tokenErr.Error())
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appendChildToStack(elemStack, &errTextElem)
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}
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return finalizeStack(elemStack)
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}
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