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