GUI

GUI is the source package

# Open?(go)

# New?(go)

# View?(go)

# CreateNode?(go)

# extractStylesheets?(go)

# extractStyleTags?(go)

# localizePath?(go)

# encapsulateText?(go)

# matchFactory?(go)

# removeWhitespace?(go)

# removeHTMLComments?(go)

  1package gui
  2
  3import (
  4	"bufio"
  5	"bytes"
  6	"crypto/sha256"
  7	_ "embed"
  8	"encoding/json"
  9	"fmt"
 10	"gui/cstyle"
 11	"gui/cstyle/plugins/flex"
 12	"gui/cstyle/plugins/inline"
 13	"gui/cstyle/plugins/inlineText"
 14	"gui/cstyle/plugins/textAlign"
 15	"gui/window"
 16
 17	"gui/element"
 18	"gui/events"
 19	"gui/utils"
 20	"net/url"
 21	"os"
 22	"path/filepath"
 23	"regexp"
 24	"strconv"
 25	"strings"
 26
 27	rl "github.com/gen2brain/raylib-go/raylib"
 28	"golang.org/x/net/html"
 29)
 30
 31// _ "net/http/pprof"
 32
 33//go:embed master.css
 34var mastercss string
 35
 36type Window struct {
 37	CSS      cstyle.CSS
 38	Document element.Node
 39	Adapter  func()
 40}
 41
 42func Open(path string) Window {
 43	window := New()
 44
 45	styleSheets, styleTags, htmlNodes := parseHTMLFromFile(path)
 46
 47	for _, v := range styleSheets {
 48		window.CSS.StyleSheet(v)
 49	}
 50
 51	for _, v := range styleTags {
 52		window.CSS.StyleTag(v)
 53	}
 54
 55	CreateNode(htmlNodes, &window.Document)
 56
 57	return window
 58}
 59
 60func New() Window {
 61	css := cstyle.CSS{
 62		Width:  800,
 63		Height: 450,
 64	}
 65
 66	css.StyleTag(mastercss)
 67	// This is still apart of computestyle
 68	// css.AddPlugin(position.Init())
 69	css.AddPlugin(inline.Init())
 70	// css.AddPlugin(block.Init())
 71	css.AddPlugin(textAlign.Init())
 72	css.AddPlugin(inlineText.Init())
 73	css.AddPlugin(flex.Init())
 74
 75	el := element.Node{}
 76	document := el.CreateElement("ROOT")
 77	document.Style["width"] = "800px"
 78	document.Style["height"] = "450px"
 79	document.Properties.Id = "ROOT"
 80	return Window{
 81		CSS:      css,
 82		Document: document,
 83	}
 84}
 85
 86func (w *Window) Render(doc element.Node, state map[string]element.State) []element.State {
 87	flatDoc := flatten(doc)
 88	store := []element.State{}
 89
 90	for _, v := range flatDoc {
 91		store = append(store, state[v.Properties.Id])
 92	}
 93	return store
 94}
 95
 96func flatten(n element.Node) []element.Node {
 97	var nodes []element.Node
 98	nodes = append(nodes, n)
 99
100	children := n.Children
101	if len(children) > 0 {
102		for _, ch := range children {
103			chNodes := flatten(ch)
104			nodes = append(nodes, chNodes...)
105		}
106	}
107	return nodes
108}
109
110// !ISSUE: Need to make it skip over non modified elements
111
112func View(data *Window, width, height int32) {
113	debug := false
114	data.Document.Style["width"] = strconv.Itoa(int(width)) + "px"
115	data.Document.Style["height"] = strconv.Itoa(int(height)) + "px"
116
117	wm := window.NewWindowManager()
118	wm.FPS = true
119
120	wm.OpenWindow(width, height)
121	defer wm.CloseWindow()
122
123	evts := map[string]element.EventList{}
124
125	eventStore := &evts
126
127	state := map[string]element.State{}
128
129	state["ROOT"] = element.State{
130		Style: map[string]string{
131			"width":  strconv.Itoa(int(width)) + "px",
132			"height": strconv.Itoa(int(height)) + "px",
133		},
134	}
135
136	shouldStop := false
137
138	var hash []byte
139	var rd []element.State
140
141	// Main game loop
142	for !wm.WindowShouldClose() && !shouldStop {
143		// fmt.Println("######################")
144		rl.BeginDrawing()
145		if !shouldStop && debug {
146			shouldStop = true
147		}
148		// Check if the window size has changed
149		newWidth := int32(rl.GetScreenWidth())
150		newHeight := int32(rl.GetScreenHeight())
151
152		if newWidth != width || newHeight != height {
153			rl.ClearBackground(rl.RayWhite)
154			// Window has been resized, handle the event
155			width = newWidth
156			height = newHeight
157
158			data.CSS.Width = float32(width)
159			data.CSS.Height = float32(height)
160
161			state["ROOT"].Style["width"] = strconv.Itoa(int(width)) + "px"
162			state["ROOT"].Style["height"] = strconv.Itoa(int(height)) + "px"
163		}
164
165		newHash, _ := hashStruct(&data.Document.Children[0])
166		eventStore = events.GetEvents(&data.Document.Children[0], &state, eventStore)
167		if !bytes.Equal(hash, newHash) {
168			fmt.Println("rteload")
169			hash = newHash
170			newDoc := CopyNode(data.Document.Children[0], &data.Document)
171			data.CSS.ComputeNodeStyle(&newDoc, &state)
172			rd = data.Render(newDoc, state)
173			wm.LoadTextures(rd)
174			// !NOTE: Add inner and outerhtml here
175		}
176		wm.Draw(rd)
177
178		events.RunEvents(eventStore)
179
180		rl.EndDrawing()
181	}
182}
183
184func CopyNode(node element.Node, parent *element.Node) element.Node {
185	n := element.Node{}
186	n.TagName = node.TagName
187	n.InnerText = node.InnerText
188	n.Style = node.Style
189	n.Id = node.Id
190	n.ClassList = node.ClassList
191	n.Href = node.Href
192	n.Src = node.Src
193	n.Title = node.Title
194	n.Attribute = node.Attribute
195	n.Value = node.Value
196	n.ScrollY = node.ScrollY
197	n.InnerHTML = node.InnerHTML
198	n.OuterHTML = node.OuterHTML
199	n.Properties.Id = node.Properties.Id
200	n.Properties.Focusable = node.Properties.Focusable
201	n.Properties.Focused = node.Properties.Focused
202	n.Properties.Editable = node.Properties.Editable
203	n.Properties.Hover = node.Properties.Hover
204	n.Properties.Selected = node.Properties.Selected
205
206	n.Parent = parent
207
208	for _, v := range node.Children {
209		n.Children = append(n.Children, CopyNode(v, &n))
210	}
211	return n
212}
213
214func CreateNode(node *html.Node, parent *element.Node) {
215	if node.Type == html.ElementNode {
216		newNode := parent.CreateElement(node.Data)
217		for _, attr := range node.Attr {
218			if attr.Key == "class" {
219				classes := strings.Split(attr.Val, " ")
220				for _, class := range classes {
221					newNode.ClassList.Add(class)
222				}
223			} else if attr.Key == "id" {
224				newNode.Id = attr.Val
225			} else if attr.Key == "contenteditable" && (attr.Val == "" || attr.Val == "true") {
226				newNode.Properties.Editable = true
227			} else if attr.Key == "href" {
228				newNode.Href = attr.Val
229			} else if attr.Key == "src" {
230				newNode.Src = attr.Val
231			} else if attr.Key == "title" {
232				newNode.Title = attr.Val
233			} else {
234				newNode.SetAttribute(attr.Key, attr.Val)
235			}
236		}
237		newNode.InnerText = strings.TrimSpace(utils.GetInnerText(node))
238		// Recursively traverse child nodes
239		for child := node.FirstChild; child != nil; child = child.NextSibling {
240			if child.Type == html.ElementNode {
241				CreateNode(child, &newNode)
242			}
243		}
244		parent.AppendChild(newNode)
245
246	} else {
247		for child := node.FirstChild; child != nil; child = child.NextSibling {
248			if child.Type == html.ElementNode {
249				CreateNode(child, parent)
250			}
251		}
252	}
253
254}
255
256func parseHTMLFromFile(path string) ([]string, []string, *html.Node) {
257	file, _ := os.Open(path)
258	defer file.Close()
259
260	scanner := bufio.NewScanner(file)
261	var htmlContent string
262
263	for scanner.Scan() {
264		htmlContent += scanner.Text() + "\n"
265	}
266
267	htmlContent = removeHTMLComments(htmlContent)
268
269	doc, _ := html.Parse(strings.NewReader(encapsulateText(removeWhitespaceBetweenTags(htmlContent))))
270
271	// Extract stylesheet link tags and style tags
272	stylesheets := extractStylesheets(doc, filepath.Dir(path))
273	styleTags := extractStyleTags(doc)
274
275	return stylesheets, styleTags, doc
276}
277
278func extractStylesheets(n *html.Node, baseDir string) []string {
279	var stylesheets []string
280
281	var dfs func(*html.Node)
282	dfs = func(node *html.Node) {
283		if node.Type == html.ElementNode && node.Data == "link" {
284			var href string
285			isStylesheet := false
286
287			for _, attr := range node.Attr {
288				if attr.Key == "rel" && attr.Val == "stylesheet" {
289					isStylesheet = true
290				} else if attr.Key == "href" {
291					href = attr.Val
292				}
293			}
294
295			if isStylesheet {
296				resolvedHref := localizePath(baseDir, href)
297				stylesheets = append(stylesheets, resolvedHref)
298			}
299		}
300
301		for c := node.FirstChild; c != nil; c = c.NextSibling {
302			dfs(c)
303		}
304	}
305
306	dfs(n)
307	return stylesheets
308}
309
310func extractStyleTags(n *html.Node) []string {
311	var styleTags []string
312
313	var dfs func(*html.Node)
314	dfs = func(node *html.Node) {
315		if node.Type == html.ElementNode && node.Data == "style" {
316			var styleContent strings.Builder
317			for c := node.FirstChild; c != nil; c = c.NextSibling {
318				if c.Type == html.TextNode {
319					styleContent.WriteString(c.Data)
320				}
321			}
322			styleTags = append(styleTags, styleContent.String())
323		}
324
325		for c := node.FirstChild; c != nil; c = c.NextSibling {
326			dfs(c)
327		}
328	}
329
330	dfs(n)
331	return styleTags
332}
333
334func localizePath(rootPath, filePath string) string {
335	// Check if the file path has a scheme, indicating it's a URL
336	u, err := url.Parse(filePath)
337	if err == nil && u.Scheme != "" {
338		return filePath
339	}
340
341	// Join the root path and the file path to create an absolute path
342	absPath := filepath.Join(rootPath, filePath)
343
344	// If the absolute path is the same as the original path, return it
345	if absPath == filePath {
346		return filePath
347	}
348
349	return "./" + absPath
350}
351
352func encapsulateText(htmlString string) string {
353	openOpen := regexp.MustCompile(`(<\w+[^>]*>)([^<]+)(<\w+[^>]*>)`)
354	closeOpen := regexp.MustCompile(`(</\w+[^>]*>)([^<]+)(<\w+[^>]*>)`)
355	closeClose := regexp.MustCompile(`(<\/\w+[^>]*>)([^<]+)(<\/\w+[^>]*>)`)
356	a := matchFactory(openOpen)
357	t := openOpen.ReplaceAllStringFunc(htmlString, a)
358	// fmt.Println(t)
359	b := matchFactory(closeOpen)
360	u := closeOpen.ReplaceAllStringFunc(t, b)
361	// fmt.Println(u)
362	c := matchFactory(closeClose)
363	v := closeClose.ReplaceAllStringFunc(u, c)
364	// fmt.Println(v)
365	return v
366}
367
368func matchFactory(re *regexp.Regexp) func(string) string {
369	return func(match string) string {
370		submatches := re.FindStringSubmatch(match)
371		if len(submatches) != 4 {
372			return match
373		}
374
375		// Process submatches
376		if len(removeWhitespace(submatches[2])) > 0 {
377			return submatches[1] + "<text>" + submatches[2] + "</text>" + submatches[3]
378		} else {
379			return match
380		}
381	}
382}
383func removeWhitespace(htmlString string) string {
384	// Remove extra white space
385	reSpaces := regexp.MustCompile(`\s+`)
386	htmlString = reSpaces.ReplaceAllString(htmlString, " ")
387
388	// Trim leading and trailing white space
389	htmlString = strings.TrimSpace(htmlString)
390
391	return htmlString
392}
393
394func removeHTMLComments(htmlString string) string {
395	re := regexp.MustCompile(`<!--[\s\S]*?-->`)
396	return re.ReplaceAllString(htmlString, "")
397}
398
399// important to allow the notspans to be injected, the spaces after removing the comments cause the regexp to fail
400func removeWhitespaceBetweenTags(html string) string {
401	// Create a regular expression to match spaces between angle brackets
402	re := regexp.MustCompile(`>\s+<`)
403	// Replace all matches of spaces between angle brackets with "><"
404	return re.ReplaceAllString(html, "><")
405}
406
407// Function to hash a struct using SHA-256
408func hashStruct(s interface{}) ([]byte, error) {
409	// Convert struct to JSON
410	jsonData, err := json.Marshal(s)
411	if err != nil {
412		return nil, err
413	}
414
415	// Hash the JSON data using SHA-256
416	hasher := sha256.New()
417	hasher.Write(jsonData)
418	hash := hasher.Sum(nil)
419
420	return hash, nil
421}