Utils

dsa

# MapToInline?(go)

# InlineToMap?(go)

# GetWH?(go)

# GetMP?(go)

# convertMarginToIndividualProperties?(go)

# ConvertToPixels?(go)

# evaluateCalcExpression?(go)

# GetTextBounds?(go)

# Merge?(go)

# ExMerge?(go)

# Max?(go)

# Min?(go)

# FindRelative?(go)

# ParseFloat?(go)

# GetStructField?(go)

# SetStructFieldValue?(go)

# Check?(go)

# GetInnerText?(go)

# GetPositionOffsetNode?(go)

# IsParent?(go)

  1package utils
  2
  3import (
  4	"bytes"
  5	"gui/element"
  6	"reflect"
  7	"regexp"
  8	"strconv"
  9	"strings"
 10
 11	"golang.org/x/net/html"
 12)
 13
 14func GetXY(n *element.Node, state *map[string]element.State) (float32, float32) {
 15	s := *state
 16	// self := s[n.Properties.Id]
 17
 18	offsetX := float32(0)
 19	offsetY := float32(0)
 20
 21	if n.Parent != nil {
 22		parent := s[n.Parent.Properties.Id]
 23		// x, y := GetXY(n.Parent, state)
 24		offsetX += parent.Border.Width + parent.Padding.Left
 25		offsetY += parent.Border.Width + parent.Padding.Top
 26	}
 27
 28	return offsetX, offsetY
 29}
 30
 31type WidthHeight struct {
 32	Width  float32
 33	Height float32
 34}
 35
 36func GetWH(n element.Node, state *map[string]element.State) WidthHeight {
 37	s := *state
 38	self := s[n.Properties.Id]
 39	parent := element.State{}
 40
 41	if n.Style == nil {
 42		n.Style = map[string]string{}
 43	}
 44
 45	fs := self.EM
 46
 47	var pwh WidthHeight
 48	if n.Parent != nil {
 49		parent = s[n.Parent.Properties.Id]
 50		pwh = GetWH(*n.Parent, state)
 51	} else {
 52		pwh = WidthHeight{}
 53		if n.Style["width"] != "" {
 54			str := strings.TrimSuffix(n.Style["width"], "px")
 55			// Convert the string to float32
 56			f, _ := strconv.ParseFloat(str, 32)
 57			pwh.Width = float32(f)
 58		}
 59
 60		if n.Style["height"] != "" {
 61			str := strings.TrimSuffix(n.Style["height"], "px")
 62			// Convert the string to float32
 63			f, _ := strconv.ParseFloat(str, 32)
 64			pwh.Height = float32(f)
 65		}
 66	}
 67
 68	wStyle := n.Style["width"]
 69
 70	if wStyle == "" && n.Style["display"] != "inline" {
 71		wStyle = "100%"
 72	}
 73
 74	width := ConvertToPixels(wStyle, fs, pwh.Width)
 75	height := ConvertToPixels(n.Style["height"], fs, pwh.Height)
 76
 77	if n.Style["min-width"] != "" {
 78		minWidth := ConvertToPixels(n.Style["min-width"], fs, pwh.Width)
 79		width = Max(width, minWidth)
 80	}
 81
 82	if n.Style["max-width"] != "" {
 83		maxWidth := ConvertToPixels(n.Style["max-width"], fs, pwh.Width)
 84		width = Min(width, maxWidth)
 85	}
 86	if n.Style["min-height"] != "" {
 87		minHeight := ConvertToPixels(n.Style["min-height"], fs, pwh.Height)
 88		height = Max(height, minHeight)
 89	}
 90
 91	if n.Style["max-height"] != "" {
 92		maxHeight := ConvertToPixels(n.Style["max-height"], fs, pwh.Height)
 93		height = Min(height, maxHeight)
 94	}
 95
 96	wh := WidthHeight{
 97		Width:  width,
 98		Height: height,
 99	}
100
101	if n.Parent != nil {
102		wh.Width += self.Padding.Left + self.Padding.Right
103		wh.Height += self.Padding.Top + self.Padding.Bottom
104		// fmt.Println(n.Properties.Id, wh, p)
105	}
106
107	if wStyle == "100%" {
108		wh.Width = wh.Width - ((self.Margin.Right + self.Margin.Left + (self.Border.Width * 2)) + (parent.Padding.Left + parent.Padding.Right) + (self.Padding.Left + self.Padding.Right))
109	}
110
111	if n.Style["height"] == "100%" {
112		wh.Height -= (self.Margin.Top + self.Margin.Bottom) + (parent.Padding.Top + parent.Padding.Bottom)
113	}
114
115	return wh
116}
117
118func GetMP(n element.Node, wh WidthHeight, state *map[string]element.State, t string) element.MarginPadding {
119	s := *state
120	self := s[n.Properties.Id]
121	fs := self.EM
122	m := element.MarginPadding{}
123
124	if n.Style[t] != "" {
125		left, right, top, bottom := convertMarginToIndividualProperties(n.Style[t])
126		if n.Style[t+"-left"] == "" {
127			n.Style[t+"-left"] = left
128		}
129		if n.Style[t+"-right"] == "" {
130			n.Style[t+"-right"] = right
131		}
132		if n.Style[t+"-top"] == "" {
133			n.Style[t+"-top"] = top
134		}
135		if n.Style[t+"-bottom"] == "" {
136			n.Style[t+"-bottom"] = bottom
137		}
138	}
139	if n.Style[t+"-left"] != "" || n.Style[t+"-right"] != "" {
140		l := ConvertToPixels(n.Style[t+"-left"], fs, wh.Width)
141		r := ConvertToPixels(n.Style[t+"-right"], fs, wh.Width)
142		m.Left = l
143		m.Right = r
144	}
145	if n.Style[t+"-top"] != "" || n.Style[t+"-bottom"] != "" {
146		top := ConvertToPixels(n.Style[t+"-top"], fs, wh.Height)
147		b := ConvertToPixels(n.Style[t+"-bottom"], fs, wh.Height)
148		m.Top = top
149		m.Bottom = b
150	}
151	if t == "margin" {
152		siblingMargin := float32(0)
153
154		// Margin Collapse (stupid fucking thing)
155		// - also not complete, see https://www.joshwcomeau.com/css/rules-of-margin-collapse/ for more details on implementation
156		// - this is a rough draft
157
158		if n.Parent != nil {
159			if ParentStyleProp(n.Parent, "display", func(prop string) bool {
160				return prop == "flex"
161			}) {
162				sibIndex := -1
163				for i, v := range n.Parent.Children {
164					if v.Properties.Id == n.Properties.Id {
165						sibIndex = i - 1
166						break
167					}
168				}
169				if sibIndex > -1 {
170					sib := s[n.Parent.Children[sibIndex].Properties.Id]
171					siblingMargin = sib.Margin.Bottom
172				}
173			}
174
175		}
176
177		if m.Top != 0 {
178			if m.Top < 0 {
179				m.Top = siblingMargin + m.Top
180			} else {
181				if m.Top > siblingMargin {
182					m.Top = m.Top - siblingMargin
183				} else {
184					m.Top = 0
185				}
186			}
187		}
188
189		if n.Style["margin"] == "auto" && n.Style["margin-left"] == "" && n.Style["margin-right"] == "" {
190			pwh := GetWH(*n.Parent, state)
191			m.Left = Max((pwh.Width-wh.Width)/2, 0)
192			m.Right = m.Left
193		}
194	}
195
196	return m
197}
198
199func convertMarginToIndividualProperties(margin string) (string, string, string, string) {
200	// Remove extra whitespace
201	margin = strings.TrimSpace(margin)
202
203	if margin == "" {
204		return "0px", "0px", "0px", "0px"
205	}
206
207	// Regular expression to match values with optional units
208	re := regexp.MustCompile(`(-?\d+(\.\d+)?)(\w*|\%)?`)
209
210	// Extract numerical values from the margin property
211	matches := re.FindAllStringSubmatch(margin, -1)
212
213	// Initialize variables for individual margins
214	var left, right, top, bottom string
215
216	switch len(matches) {
217	case 1:
218		// If only one value is provided, apply it to all margins
219		left = matches[0][0]
220		right = matches[0][0]
221		top = matches[0][0]
222		bottom = matches[0][0]
223	case 2:
224		// If two values are provided, apply the first to top and bottom, and the second to left and right
225		top = matches[0][0]
226		bottom = matches[0][0]
227		left = matches[1][0]
228		right = matches[1][0]
229	case 3:
230		// If three values are provided, apply the first to top, the second to left and right, and the third to bottom
231		top = matches[0][0]
232		left = matches[1][0]
233		right = matches[1][0]
234		bottom = matches[2][0]
235	case 4:
236		// If four values are provided, apply them to top, right, bottom, and left, respectively
237		top = matches[0][0]
238		right = matches[1][0]
239		bottom = matches[2][0]
240		left = matches[3][0]
241	}
242
243	return left, right, top, bottom
244}
245
246// ConvertToPixels converts a CSS measurement to pixels.
247func ConvertToPixels(value string, em, max float32) float32 {
248	unitFactors := map[string]float32{
249		"px": 1,
250		"em": em,
251		"pt": 1.33,
252		"pc": 16.89,
253		"%":  max / 100,
254		"vw": max / 100,
255		"vh": max / 100,
256		"cm": 37.79527559,
257		"in": 96,
258	}
259
260	if strings.HasPrefix(value, "calc(") {
261		// Handle calculation expression
262		calcResult := evaluateCalcExpression(value[5:len(value)-1], em, max)
263		return calcResult
264	} else {
265		// Extract numeric value and unit
266		for k, v := range unitFactors {
267			if strings.HasSuffix(value, k) {
268				cutStr, _ := strings.CutSuffix(value, k)
269				numericValue, _ := strconv.ParseFloat(cutStr, 64)
270				return float32(numericValue) * v
271			}
272		}
273		return 0
274	}
275
276}
277
278// evaluateCalcExpression recursively evaluates 'calc()' expressions
279func evaluateCalcExpression(expression string, em, max float32) float32 {
280	terms := strings.FieldsFunc(expression, func(c rune) bool {
281		return c == '+' || c == '-' || c == '*' || c == '/'
282	})
283
284	operators := strings.FieldsFunc(expression, func(c rune) bool {
285		return c != '+' && c != '-' && c != '*' && c != '/'
286	})
287
288	var result float32
289
290	for i, term := range terms {
291		value := ConvertToPixels(strings.TrimSpace(term), em, max)
292
293		if i > 0 {
294			switch operators[i-1] {
295			case "+":
296				result += value
297			case "-":
298				result -= value
299			case "*":
300				result *= value
301			case "/":
302				if value != 0 {
303					result /= value
304				} else {
305					return 0
306				}
307			}
308		} else {
309			result = value
310		}
311	}
312
313	return result
314}
315
316func Merge(m1, m2 map[string]string) map[string]string {
317	// Create a new map and copy m1 into it
318	result := make(map[string]string)
319	for k, v := range m1 {
320		result[k] = v
321	}
322
323	// Merge m2 into the new map
324	for k, v := range m2 {
325		result[k] = v
326	}
327
328	return result
329}
330
331func Max(a, b float32) float32 {
332	if a > b {
333		return a
334	} else {
335		return b
336	}
337}
338
339func Min(a, b float32) float32 {
340	if a < b {
341		return a
342	} else {
343		return b
344	}
345}
346
347// getStructField uses reflection to get the value of a struct field by name
348func GetStructField(data interface{}, fieldName string) interface{} {
349	val := reflect.ValueOf(data)
350
351	// Make sure we have a pointer to a struct
352	if val.Kind() != reflect.Ptr || val.Elem().Kind() != reflect.Struct {
353		return nil
354	}
355
356	// Get the struct field by name
357	field := val.Elem().FieldByName(fieldName)
358
359	// Check if the field exists
360	if !field.IsValid() {
361		return nil
362	}
363
364	return field.Interface()
365}
366
367func SetStructFieldValue(data interface{}, fieldName string, newValue interface{}) {
368	val := reflect.ValueOf(data)
369
370	// Make sure we have a pointer to a struct
371	if val.Kind() != reflect.Ptr || val.Elem().Kind() != reflect.Struct {
372		return
373	}
374
375	// Get the struct field by name
376	field := val.Elem().FieldByName(fieldName)
377
378	// Check if the field exists
379	if !field.IsValid() {
380		return
381	}
382
383	// Check if the new value type is assignable to the field type
384	if !reflect.ValueOf(newValue).Type().AssignableTo(field.Type()) {
385		return
386	}
387
388	// Set the new value
389	field.Set(reflect.ValueOf(newValue))
390
391}
392
393// func Check(e error) {
394// 	if e != nil {
395// 		panic(e)
396// 	}
397// }
398
399func GetInnerText(n *html.Node) string {
400	var result strings.Builder
401
402	var getText func(*html.Node)
403	getText = func(n *html.Node) {
404		// Skip processing if the node is a head tag
405		if n.Type == html.ElementNode && n.Data == "head" {
406			return
407		}
408
409		// If it's a text node, append its content
410		if n.Type == html.TextNode {
411			result.WriteString(n.Data)
412		}
413
414		// Traverse child nodes recursively
415		for c := n.FirstChild; c != nil; c = c.NextSibling {
416			getText(c)
417		}
418	}
419
420	getText(n)
421
422	return result.String()
423}
424
425func GetPositionOffsetNode(n *element.Node) *element.Node {
426	pos := n.Style["position"]
427
428	if pos == "relative" {
429		return n
430	} else {
431		if n.Parent.TagName != "ROOT" {
432			if n.Parent.Style != nil {
433				return GetPositionOffsetNode(n.Parent)
434			} else {
435				return nil
436			}
437		} else {
438			return n.Parent
439		}
440	}
441}
442
443func IsParent(n element.Node, name string) bool {
444	if n.Parent.TagName != "ROOT" {
445		if n.Parent.TagName == name {
446			return true
447		} else {
448			return IsParent(*n.Parent, name)
449		}
450	} else {
451		return false
452	}
453}
454
455func ChildrenHaveText(n *element.Node) bool {
456	for _, child := range n.Children {
457		if len(strings.TrimSpace(child.InnerText)) != 0 {
458			return true
459		}
460		// Recursively check if any child nodes have text
461		if ChildrenHaveText(&child) {
462			return true
463		}
464	}
465	return false
466}
467
468func NodeToHTML(node element.Node) (string, string) {
469	// if node.TagName == "notaspan" {
470	// 	return node.InnerText + " ", ""
471	// }
472
473	var buffer bytes.Buffer
474	buffer.WriteString("<" + node.TagName)
475
476	if node.Properties.Editable {
477		buffer.WriteString(" contentEditable=\"true\"")
478	}
479
480	// Add ID if present
481	if node.Id != "" {
482		buffer.WriteString(" id=\"" + node.Id + "\"")
483	}
484
485	// Add ID if present
486	if node.Title != "" {
487		buffer.WriteString(" title=\"" + node.Title + "\"")
488	}
489
490	// Add ID if present
491	if node.Src != "" {
492		buffer.WriteString(" src=\"" + node.Src + "\"")
493	}
494
495	// Add ID if present
496	if node.Href != "" {
497		buffer.WriteString(" href=\"" + node.Href + "\"")
498	}
499
500	// Add class list if present
501	if len(node.ClassList.Classes) > 0 || node.ClassList.Value != "" {
502		classes := ""
503		for _, v := range node.ClassList.Classes {
504			if len(v) > 0 {
505				if string(v[0]) != ":" {
506					classes += v + " "
507				}
508			}
509		}
510		classes = strings.TrimSpace(classes)
511		if len(classes) > 0 {
512			buffer.WriteString(" class=\"" + classes + "\"")
513		}
514	}
515
516	// Add style if present
517	if len(node.Style) > 0 {
518
519		style := ""
520		for key, value := range node.Style {
521			if key != "inlineText" {
522				style += key + ":" + value + ";"
523			}
524		}
525		style = strings.TrimSpace(style)
526
527		if len(style) > 0 {
528			buffer.WriteString(" style=\"" + style + "\"")
529		}
530	}
531
532	// Add other attributes if present
533	for key, value := range node.Attribute {
534		if strings.TrimSpace(value) != "" {
535			buffer.WriteString(" " + key + "=\"" + value + "\"")
536		}
537	}
538
539	buffer.WriteString(">")
540
541	// Add inner text if present
542	if node.InnerText != "" && !ChildrenHaveText(&node) {
543		buffer.WriteString(node.InnerText)
544	}
545	return buffer.String(), "</" + node.TagName + ">"
546}
547
548func OuterHTML(node element.Node) string {
549	var buffer bytes.Buffer
550
551	tag, closing := NodeToHTML(node)
552
553	buffer.WriteString(tag)
554
555	// Recursively add children
556	for _, child := range node.Children {
557		buffer.WriteString(OuterHTML(child))
558	}
559
560	buffer.WriteString(closing)
561
562	return buffer.String()
563}
564
565func InnerHTML(node element.Node) string {
566	var buffer bytes.Buffer
567	// Recursively add children
568	for _, child := range node.Children {
569		buffer.WriteString(OuterHTML(child))
570	}
571	return buffer.String()
572}
573
574func ReverseSlice[T any](s []T) {
575	for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 {
576		s[i], s[j] = s[j], s[i]
577	}
578}
579
580func ParentStyleProp(n *element.Node, prop string, selector func(string) bool) bool {
581	if n.Parent != nil {
582		if selector(n.Parent.Style[prop]) {
583			return true
584		} else {
585			return ParentStyleProp(n.Parent, prop, selector)
586		}
587	}
588	return false
589}