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	"gui/cstyle"
 10	"gui/cstyle/plugins/flex"
 11	"gui/cstyle/plugins/inline"
 12	"gui/cstyle/plugins/textAlign"
 13	"gui/cstyle/transformers/text"
 14	"gui/window"
 15
 16	"gui/element"
 17	"gui/events"
 18	"gui/utils"
 19	"net/url"
 20	"os"
 21	"path/filepath"
 22	"regexp"
 23	"strconv"
 24	"strings"
 25
 26	rl "github.com/gen2brain/raylib-go/raylib"
 27	"golang.org/x/net/html"
 28)
 29
 30// _ "net/http/pprof"
 31
 32//go:embed master.css
 33var mastercss string
 34
 35type Window struct {
 36	CSS      cstyle.CSS
 37	Document element.Node
 38	Adapter  func()
 39}
 40
 41func Open(path string) Window {
 42	window := New()
 43
 44	styleSheets, styleTags, htmlNodes := parseHTMLFromFile(path)
 45
 46	for _, v := range styleSheets {
 47		window.CSS.StyleSheet(v)
 48	}
 49
 50	for _, v := range styleTags {
 51		window.CSS.StyleTag(v)
 52	}
 53
 54	CreateNode(htmlNodes, &window.Document)
 55
 56	return window
 57}
 58
 59func New() Window {
 60	css := cstyle.CSS{
 61		Width:  800,
 62		Height: 450,
 63	}
 64
 65	css.StyleTag(mastercss)
 66	// This is still apart of computestyle
 67	// css.AddPlugin(position.Init())
 68	css.AddPlugin(inline.Init())
 69	// css.AddPlugin(block.Init())
 70	css.AddPlugin(textAlign.Init())
 71	// css.AddPlugin(inlineText.Init())
 72	css.AddPlugin(flex.Init())
 73
 74	css.AddTransformer(text.Init())
 75
 76	el := element.Node{}
 77	document := el.CreateElement("ROOT")
 78	document.Style["width"] = "800px"
 79	document.Style["height"] = "450px"
 80	document.Properties.Id = "ROOT"
 81	return Window{
 82		CSS:      css,
 83		Document: document,
 84	}
 85}
 86
 87func (w *Window) Render(doc element.Node, state *map[string]element.State) []element.State {
 88	s := *state
 89
 90	flatDoc := flatten(doc)
 91
 92	store := []element.State{}
 93
 94	keys := []string{}
 95
 96	for _, v := range flatDoc {
 97		store = append(store, s[v.Properties.Id])
 98		keys = append(keys, v.Properties.Id)
 99	}
100
101	// Create a set of keys to keep
102	keysSet := make(map[string]struct{}, len(keys))
103	for _, key := range keys {
104		keysSet[key] = struct{}{}
105	}
106
107	// Iterate over the map and delete keys not in the set
108	for k := range s {
109		if _, found := keysSet[k]; !found {
110			delete(s, k)
111		}
112	}
113
114	return store
115}
116
117func flatten(n element.Node) []element.Node {
118	var nodes []element.Node
119	nodes = append(nodes, n)
120
121	children := n.Children
122	if len(children) > 0 {
123		for _, ch := range children {
124			chNodes := flatten(ch)
125			nodes = append(nodes, chNodes...)
126		}
127	}
128	return nodes
129}
130
131// !ISSUE: Need to make it skip over non modified elements
132
133func View(data *Window, width, height int32) {
134	debug := false
135	data.Document.Style["width"] = strconv.Itoa(int(width)) + "px"
136	data.Document.Style["height"] = strconv.Itoa(int(height)) + "px"
137
138	wm := window.NewWindowManager()
139	wm.FPS = true
140
141	wm.OpenWindow(width, height)
142	defer wm.CloseWindow()
143
144	evts := map[string]element.EventList{}
145
146	eventStore := &evts
147
148	state := map[string]element.State{}
149
150	shouldStop := false
151
152	var hash []byte
153	var rd []element.State
154
155	// Main game loop
156	for !wm.WindowShouldClose() && !shouldStop {
157		// fmt.Println("######################")
158		rl.BeginDrawing()
159		if !shouldStop && debug {
160			shouldStop = true
161		}
162		// Check if the window size has changed
163		newWidth := int32(rl.GetScreenWidth())
164		newHeight := int32(rl.GetScreenHeight())
165
166		resize := false
167
168		if newWidth != width || newHeight != height {
169			resize = true
170			rl.ClearBackground(rl.RayWhite)
171			// Window has been resized, handle the event
172			width = newWidth
173			height = newHeight
174
175			data.CSS.Width = float32(width)
176			data.CSS.Height = float32(height)
177
178			data.Document.Style["width"] = strconv.Itoa(int(width)) + "px"
179			data.Document.Style["height"] = strconv.Itoa(int(height)) + "px"
180		}
181
182		newHash, _ := hashStruct(&data.Document.Children[0])
183		eventStore = events.GetEvents(&data.Document.Children[0], &state, eventStore)
184		if !bytes.Equal(hash, newHash) || resize {
185			hash = newHash
186			newDoc := CopyNode(data.CSS, data.Document.Children[0], &data.Document)
187
188			newDoc = data.CSS.Transform(newDoc)
189
190			data.CSS.ComputeNodeStyle(&newDoc, &state)
191			rd = data.Render(newDoc, &state)
192			wm.LoadTextures(rd)
193			// !TODO: Clear out state
194			// !NOTE: Add inner and outerhtml here
195			AddHTML(&data.Document)
196		}
197		wm.Draw(rd)
198
199		events.RunEvents(eventStore)
200
201		rl.EndDrawing()
202	}
203}
204
205func CopyNode(c cstyle.CSS, node element.Node, parent *element.Node) element.Node {
206	n := element.Node{}
207	n.TagName = node.TagName
208	n.InnerText = node.InnerText
209	n.Style = node.Style
210	n.Id = node.Id
211	n.ClassList = node.ClassList
212	n.Href = node.Href
213	n.Src = node.Src
214	n.Title = node.Title
215	n.Attribute = node.Attribute
216	n.Value = node.Value
217	n.ScrollY = node.ScrollY
218	n.InnerHTML = node.InnerHTML
219	n.OuterHTML = node.OuterHTML
220	n.Properties.Id = node.Properties.Id
221	n.Properties.Focusable = node.Properties.Focusable
222	n.Properties.Focused = node.Properties.Focused
223	n.Properties.Editable = node.Properties.Editable
224	n.Properties.Hover = node.Properties.Hover
225	n.Properties.Selected = node.Properties.Selected
226
227	n.Parent = parent
228
229	n.Style = c.GetStyles(n)
230
231	for _, v := range node.Children {
232		n.Children = append(n.Children, CopyNode(c, v, &n))
233	}
234	return n
235}
236
237func CreateNode(node *html.Node, parent *element.Node) {
238	if node.Type == html.ElementNode {
239		newNode := parent.CreateElement(node.Data)
240		for _, attr := range node.Attr {
241			if attr.Key == "class" {
242				classes := strings.Split(attr.Val, " ")
243				for _, class := range classes {
244					newNode.ClassList.Add(class)
245				}
246			} else if attr.Key == "id" {
247				newNode.Id = attr.Val
248			} else if attr.Key == "contenteditable" && (attr.Val == "" || attr.Val == "true") {
249				newNode.Properties.Editable = true
250			} else if attr.Key == "href" {
251				newNode.Href = attr.Val
252			} else if attr.Key == "src" {
253				newNode.Src = attr.Val
254			} else if attr.Key == "title" {
255				newNode.Title = attr.Val
256			} else {
257				newNode.SetAttribute(attr.Key, attr.Val)
258			}
259		}
260		newNode.InnerText = strings.TrimSpace(utils.GetInnerText(node))
261		// Recursively traverse child nodes
262		for child := node.FirstChild; child != nil; child = child.NextSibling {
263			if child.Type == html.ElementNode {
264				CreateNode(child, &newNode)
265			}
266		}
267		parent.AppendChild(newNode)
268
269	} else {
270		for child := node.FirstChild; child != nil; child = child.NextSibling {
271			if child.Type == html.ElementNode {
272				CreateNode(child, parent)
273			}
274		}
275	}
276}
277
278func AddHTML(n *element.Node) {
279	n.InnerHTML = utils.InnerHTML(*n)
280	tag, closing := utils.NodeToHTML(*n)
281	n.OuterHTML = tag + n.InnerHTML + closing
282	for i := range n.Children {
283		AddHTML(&n.Children[i])
284	}
285}
286
287func parseHTMLFromFile(path string) ([]string, []string, *html.Node) {
288	file, _ := os.Open(path)
289	defer file.Close()
290
291	scanner := bufio.NewScanner(file)
292	var htmlContent string
293
294	for scanner.Scan() {
295		htmlContent += scanner.Text() + "\n"
296	}
297
298	htmlContent = removeHTMLComments(htmlContent)
299
300	doc, _ := html.Parse(strings.NewReader(encapsulateText(removeWhitespaceBetweenTags(htmlContent))))
301
302	// Extract stylesheet link tags and style tags
303	stylesheets := extractStylesheets(doc, filepath.Dir(path))
304	styleTags := extractStyleTags(doc)
305
306	return stylesheets, styleTags, doc
307}
308
309func extractStylesheets(n *html.Node, baseDir string) []string {
310	var stylesheets []string
311
312	var dfs func(*html.Node)
313	dfs = func(node *html.Node) {
314		if node.Type == html.ElementNode && node.Data == "link" {
315			var href string
316			isStylesheet := false
317
318			for _, attr := range node.Attr {
319				if attr.Key == "rel" && attr.Val == "stylesheet" {
320					isStylesheet = true
321				} else if attr.Key == "href" {
322					href = attr.Val
323				}
324			}
325
326			if isStylesheet {
327				resolvedHref := localizePath(baseDir, href)
328				stylesheets = append(stylesheets, resolvedHref)
329			}
330		}
331
332		for c := node.FirstChild; c != nil; c = c.NextSibling {
333			dfs(c)
334		}
335	}
336
337	dfs(n)
338	return stylesheets
339}
340
341func extractStyleTags(n *html.Node) []string {
342	var styleTags []string
343
344	var dfs func(*html.Node)
345	dfs = func(node *html.Node) {
346		if node.Type == html.ElementNode && node.Data == "style" {
347			var styleContent strings.Builder
348			for c := node.FirstChild; c != nil; c = c.NextSibling {
349				if c.Type == html.TextNode {
350					styleContent.WriteString(c.Data)
351				}
352			}
353			styleTags = append(styleTags, styleContent.String())
354		}
355
356		for c := node.FirstChild; c != nil; c = c.NextSibling {
357			dfs(c)
358		}
359	}
360
361	dfs(n)
362	return styleTags
363}
364
365func localizePath(rootPath, filePath string) string {
366	// Check if the file path has a scheme, indicating it's a URL
367	u, err := url.Parse(filePath)
368	if err == nil && u.Scheme != "" {
369		return filePath
370	}
371
372	// Join the root path and the file path to create an absolute path
373	absPath := filepath.Join(rootPath, filePath)
374
375	// If the absolute path is the same as the original path, return it
376	if absPath == filePath {
377		return filePath
378	}
379
380	return "./" + absPath
381}
382
383func encapsulateText(htmlString string) string {
384	openOpen := regexp.MustCompile(`(<\w+[^>]*>)([^<]+)(<\w+[^>]*>)`)
385	closeOpen := regexp.MustCompile(`(</\w+[^>]*>)([^<]+)(<\w+[^>]*>)`)
386	closeClose := regexp.MustCompile(`(<\/\w+[^>]*>)([^<]+)(<\/\w+[^>]*>)`)
387	a := matchFactory(openOpen)
388	t := openOpen.ReplaceAllStringFunc(htmlString, a)
389	// fmt.Println(t)
390	b := matchFactory(closeOpen)
391	u := closeOpen.ReplaceAllStringFunc(t, b)
392	// fmt.Println(u)
393	c := matchFactory(closeClose)
394	v := closeClose.ReplaceAllStringFunc(u, c)
395	// fmt.Println(v)
396	return v
397}
398
399func matchFactory(re *regexp.Regexp) func(string) string {
400	return func(match string) string {
401		submatches := re.FindStringSubmatch(match)
402		if len(submatches) != 4 {
403			return match
404		}
405
406		// Process submatches
407		if len(removeWhitespace(submatches[2])) > 0 {
408			return submatches[1] + "<text>" + submatches[2] + "</text>" + submatches[3]
409		} else {
410			return match
411		}
412	}
413}
414func removeWhitespace(htmlString string) string {
415	// Remove extra white space
416	reSpaces := regexp.MustCompile(`\s+`)
417	htmlString = reSpaces.ReplaceAllString(htmlString, " ")
418
419	// Trim leading and trailing white space
420	htmlString = strings.TrimSpace(htmlString)
421
422	return htmlString
423}
424
425func removeHTMLComments(htmlString string) string {
426	re := regexp.MustCompile(`<!--[\s\S]*?-->`)
427	return re.ReplaceAllString(htmlString, "")
428}
429
430// important to allow the notspans to be injected, the spaces after removing the comments cause the regexp to fail
431func removeWhitespaceBetweenTags(html string) string {
432	// Create a regular expression to match spaces between angle brackets
433	re := regexp.MustCompile(`>\s+<`)
434	// Replace all matches of spaces between angle brackets with "><"
435	return re.ReplaceAllString(html, "><")
436}
437
438// Function to hash a struct using SHA-256
439func hashStruct(s interface{}) ([]byte, error) {
440	// Convert struct to JSON
441	jsonData, err := json.Marshal(s)
442	if err != nil {
443		return nil, err
444	}
445
446	// Hash the JSON data using SHA-256
447	hasher := sha256.New()
448	hasher.Write(jsonData)
449	hash := hasher.Sum(nil)
450
451	return hash, nil
452}