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	"time"
 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	css.AddTransformer(text.Init())
 76
 77	el := element.Node{}
 78	document := el.CreateElement("ROOT")
 79	document.Style["width"] = "800px"
 80	document.Style["height"] = "450px"
 81	document.Properties.Id = "ROOT"
 82	return Window{
 83		CSS:      css,
 84		Document: document,
 85	}
 86}
 87
 88func (w *Window) Render(doc element.Node, state *map[string]element.State) []element.State {
 89	s := *state
 90
 91	flatDoc := flatten(doc)
 92
 93	store := []element.State{}
 94
 95	keys := []string{}
 96
 97	for _, v := range flatDoc {
 98		store = append(store, s[v.Properties.Id])
 99		keys = append(keys, v.Properties.Id)
100	}
101
102	// Create a set of keys to keep
103	keysSet := make(map[string]struct{}, len(keys))
104	for _, key := range keys {
105		keysSet[key] = struct{}{}
106	}
107
108	// Iterate over the map and delete keys not in the set
109	for k := range s {
110		if _, found := keysSet[k]; !found {
111			delete(s, k)
112		}
113	}
114
115	return store
116}
117
118func flatten(n element.Node) []element.Node {
119	var nodes []element.Node
120	nodes = append(nodes, n)
121
122	children := n.Children
123	if len(children) > 0 {
124		for _, ch := range children {
125			chNodes := flatten(ch)
126			nodes = append(nodes, chNodes...)
127		}
128	}
129	return nodes
130}
131
132func View(data *Window, width, height int32) {
133	debug := false
134	data.Document.Style["width"] = strconv.Itoa(int(width)) + "px"
135	data.Document.Style["height"] = strconv.Itoa(int(height)) + "px"
136
137	wm := window.NewWindowManager()
138	wm.FPSCounterOn = true
139
140	wm.OpenWindow(width, height)
141	defer wm.CloseWindow()
142
143	evts := map[string]element.EventList{}
144
145	eventStore := &evts
146
147	state := map[string]element.State{}
148
149	shouldStop := false
150
151	var hash []byte
152	var rd []element.State
153
154	lastChange := time.Now()
155
156	// Main game loop
157	for !wm.WindowShouldClose() && !shouldStop {
158		// fmt.Println("######################")
159		rl.BeginDrawing()
160		if !shouldStop && debug {
161			shouldStop = true
162		}
163		// Check if the window size has changed
164		newWidth := int32(rl.GetScreenWidth())
165		newHeight := int32(rl.GetScreenHeight())
166
167		resize := false
168
169		if newWidth != width || newHeight != height {
170			resize = true
171			rl.ClearBackground(rl.RayWhite)
172			// Window has been resized, handle the event
173			width = newWidth
174			height = newHeight
175
176			data.CSS.Width = float32(width)
177			data.CSS.Height = float32(height)
178
179			data.Document.Style["width"] = strconv.Itoa(int(width)) + "px"
180			data.Document.Style["height"] = strconv.Itoa(int(height)) + "px"
181		}
182
183		newHash, _ := hashStruct(&data.Document.Children[0])
184		eventStore = events.GetEvents(&data.Document.Children[0], &state, eventStore)
185		if !bytes.Equal(hash, newHash) || resize {
186			if wm.FPS != 30 {
187				wm.SetFPS(30)
188			}
189			lastChange = time.Now()
190			hash = newHash
191			newDoc := CopyNode(data.CSS, data.Document.Children[0], &data.Document)
192
193			newDoc = data.CSS.Transform(newDoc)
194
195			data.CSS.ComputeNodeStyle(&newDoc, &state)
196			rd = data.Render(newDoc, &state)
197			wm.LoadTextures(rd)
198			AddHTML(&data.Document)
199		}
200		wm.Draw(rd)
201
202		// could use a return value that indicates whether or not a event has ran to ramp/deramp fps based on activity
203
204		events.RunEvents(eventStore)
205		// ran := events.RunEvents(eventStore)
206
207		// if !ran {
208		// 	if wm.FPS < 60 {
209		// 		wm.SetFSP(wm.FPS + 1)
210		// 	}
211		// } else {
212		// 	if wm.FPS > 10 {
213		// 		wm.SetFSP(wm.FPS - 1)
214		// 	}
215		// }
216
217		if time.Since(lastChange) > 5*time.Second {
218			if wm.FPS != 1 {
219				wm.SetFPS(1)
220			}
221		}
222
223		rl.EndDrawing()
224	}
225}
226
227func CopyNode(c cstyle.CSS, node element.Node, parent *element.Node) element.Node {
228	n := element.Node{}
229	n.TagName = node.TagName
230	n.InnerText = node.InnerText
231	n.Style = node.Style
232	n.Id = node.Id
233	n.ClassList = node.ClassList
234	n.Href = node.Href
235	n.Src = node.Src
236	n.Title = node.Title
237	n.Attribute = node.Attribute
238	n.Value = node.Value
239	n.ScrollY = node.ScrollY
240	n.InnerHTML = node.InnerHTML
241	n.OuterHTML = node.OuterHTML
242	n.Properties.Id = node.Properties.Id
243	n.Properties.Focusable = node.Properties.Focusable
244	n.Properties.Focused = node.Properties.Focused
245	n.Properties.Editable = node.Properties.Editable
246	n.Properties.Hover = node.Properties.Hover
247	n.Properties.Selected = node.Properties.Selected
248
249	n.Parent = parent
250
251	n.Style = c.GetStyles(n)
252
253	for _, v := range node.Children {
254		n.Children = append(n.Children, CopyNode(c, v, &n))
255	}
256	return n
257}
258
259func CreateNode(node *html.Node, parent *element.Node) {
260	if node.Type == html.ElementNode {
261		newNode := parent.CreateElement(node.Data)
262		for _, attr := range node.Attr {
263			if attr.Key == "class" {
264				classes := strings.Split(attr.Val, " ")
265				for _, class := range classes {
266					newNode.ClassList.Add(class)
267				}
268			} else if attr.Key == "id" {
269				newNode.Id = attr.Val
270			} else if attr.Key == "contenteditable" && (attr.Val == "" || attr.Val == "true") {
271				newNode.Properties.Editable = true
272			} else if attr.Key == "href" {
273				newNode.Href = attr.Val
274			} else if attr.Key == "src" {
275				newNode.Src = attr.Val
276			} else if attr.Key == "title" {
277				newNode.Title = attr.Val
278			} else {
279				newNode.SetAttribute(attr.Key, attr.Val)
280			}
281		}
282		newNode.InnerText = strings.TrimSpace(utils.GetInnerText(node))
283		// Recursively traverse child nodes
284		for child := node.FirstChild; child != nil; child = child.NextSibling {
285			if child.Type == html.ElementNode {
286				CreateNode(child, &newNode)
287			}
288		}
289		parent.AppendChild(newNode)
290
291	} else {
292		for child := node.FirstChild; child != nil; child = child.NextSibling {
293			if child.Type == html.ElementNode {
294				CreateNode(child, parent)
295			}
296		}
297	}
298}
299
300func AddHTML(n *element.Node) {
301	// Head is not renderable
302	n.InnerHTML = utils.InnerHTML(*n)
303	tag, closing := utils.NodeToHTML(*n)
304	n.OuterHTML = tag + n.InnerHTML + closing
305	for i := range n.Children {
306		AddHTML(&n.Children[i])
307	}
308}
309
310func parseHTMLFromFile(path string) ([]string, []string, *html.Node) {
311	file, _ := os.Open(path)
312	defer file.Close()
313
314	scanner := bufio.NewScanner(file)
315	var htmlContent string
316
317	for scanner.Scan() {
318		htmlContent += scanner.Text() + "\n"
319	}
320
321	htmlContent = removeHTMLComments(htmlContent)
322
323	doc, _ := html.Parse(strings.NewReader(encapsulateText(removeWhitespaceBetweenTags(htmlContent))))
324
325	// Extract stylesheet link tags and style tags
326	stylesheets := extractStylesheets(doc, filepath.Dir(path))
327	styleTags := extractStyleTags(doc)
328
329	return stylesheets, styleTags, doc
330}
331
332func extractStylesheets(n *html.Node, baseDir string) []string {
333	var stylesheets []string
334
335	var dfs func(*html.Node)
336	dfs = func(node *html.Node) {
337		if node.Type == html.ElementNode && node.Data == "link" {
338			var href string
339			isStylesheet := false
340
341			for _, attr := range node.Attr {
342				if attr.Key == "rel" && attr.Val == "stylesheet" {
343					isStylesheet = true
344				} else if attr.Key == "href" {
345					href = attr.Val
346				}
347			}
348
349			if isStylesheet {
350				resolvedHref := localizePath(baseDir, href)
351				stylesheets = append(stylesheets, resolvedHref)
352			}
353		}
354
355		for c := node.FirstChild; c != nil; c = c.NextSibling {
356			dfs(c)
357		}
358	}
359
360	dfs(n)
361	return stylesheets
362}
363
364func extractStyleTags(n *html.Node) []string {
365	var styleTags []string
366
367	var dfs func(*html.Node)
368	dfs = func(node *html.Node) {
369		if node.Type == html.ElementNode && node.Data == "style" {
370			var styleContent strings.Builder
371			for c := node.FirstChild; c != nil; c = c.NextSibling {
372				if c.Type == html.TextNode {
373					styleContent.WriteString(c.Data)
374				}
375			}
376			styleTags = append(styleTags, styleContent.String())
377		}
378
379		for c := node.FirstChild; c != nil; c = c.NextSibling {
380			dfs(c)
381		}
382	}
383
384	dfs(n)
385	return styleTags
386}
387
388func localizePath(rootPath, filePath string) string {
389	// Check if the file path has a scheme, indicating it's a URL
390	u, err := url.Parse(filePath)
391	if err == nil && u.Scheme != "" {
392		return filePath
393	}
394
395	// Join the root path and the file path to create an absolute path
396	absPath := filepath.Join(rootPath, filePath)
397
398	// If the absolute path is the same as the original path, return it
399	if absPath == filePath {
400		return filePath
401	}
402
403	return "./" + absPath
404}
405
406func encapsulateText(htmlString string) string {
407	openOpen := regexp.MustCompile(`(<\w+[^>]*>)([^<]+)(<\w+[^>]*>)`)
408	closeOpen := regexp.MustCompile(`(</\w+[^>]*>)([^<]+)(<\w+[^>]*>)`)
409	closeClose := regexp.MustCompile(`(<\/\w+[^>]*>)([^<]+)(<\/\w+[^>]*>)`)
410	a := matchFactory(openOpen)
411	t := openOpen.ReplaceAllStringFunc(htmlString, a)
412	// fmt.Println(t)
413	b := matchFactory(closeOpen)
414	u := closeOpen.ReplaceAllStringFunc(t, b)
415	// fmt.Println(u)
416	c := matchFactory(closeClose)
417	v := closeClose.ReplaceAllStringFunc(u, c)
418	// fmt.Println(v)
419	return v
420}
421
422func matchFactory(re *regexp.Regexp) func(string) string {
423	return func(match string) string {
424		submatches := re.FindStringSubmatch(match)
425		if len(submatches) != 4 {
426			return match
427		}
428
429		// Process submatches
430		if len(removeWhitespace(submatches[2])) > 0 {
431			return submatches[1] + "<text>" + submatches[2] + "</text>" + submatches[3]
432		} else {
433			return match
434		}
435	}
436}
437func removeWhitespace(htmlString string) string {
438	// Remove extra white space
439	reSpaces := regexp.MustCompile(`\s+`)
440	htmlString = reSpaces.ReplaceAllString(htmlString, " ")
441
442	// Trim leading and trailing white space
443	htmlString = strings.TrimSpace(htmlString)
444
445	return htmlString
446}
447
448func removeHTMLComments(htmlString string) string {
449	re := regexp.MustCompile(`<!--[\s\S]*?-->`)
450	return re.ReplaceAllString(htmlString, "")
451}
452
453// important to allow the notspans to be injected, the spaces after removing the comments cause the regexp to fail
454func removeWhitespaceBetweenTags(html string) string {
455	// Create a regular expression to match spaces between angle brackets
456	re := regexp.MustCompile(`>\s+<`)
457	// Replace all matches of spaces between angle brackets with "><"
458	return re.ReplaceAllString(html, "><")
459}
460
461// Function to hash a struct using SHA-256
462func hashStruct(s interface{}) ([]byte, error) {
463	// Convert struct to JSON
464	jsonData, err := json.Marshal(s)
465	if err != nil {
466		return nil, err
467	}
468
469	// Hash the JSON data using SHA-256
470	hasher := sha256.New()
471	hasher.Write(jsonData)
472	hash := hasher.Sum(nil)
473
474	return hash, nil
475}