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	units := map[string]float32{
261		"thick":  5,
262		"medium": 3,
263		"thin":   1,
264	}
265
266	if strings.HasPrefix(value, "calc(") {
267		// Handle calculation expression
268		calcResult := evaluateCalcExpression(value[5:len(value)-1], em, max)
269		return calcResult
270	} else {
271		for k, v := range units {
272			if value == k {
273				return v
274			}
275		}
276		// Extract numeric value and unit
277		for k, v := range unitFactors {
278			if strings.HasSuffix(value, k) {
279				cutStr, _ := strings.CutSuffix(value, k)
280				numericValue, _ := strconv.ParseFloat(cutStr, 64)
281				return float32(numericValue) * v
282			}
283		}
284
285		return 0
286	}
287
288}
289
290// evaluateCalcExpression recursively evaluates 'calc()' expressions
291func evaluateCalcExpression(expression string, em, max float32) float32 {
292	terms := strings.FieldsFunc(expression, func(c rune) bool {
293		return c == '+' || c == '-' || c == '*' || c == '/'
294	})
295
296	operators := strings.FieldsFunc(expression, func(c rune) bool {
297		return c != '+' && c != '-' && c != '*' && c != '/'
298	})
299
300	var result float32
301
302	for i, term := range terms {
303		value := ConvertToPixels(strings.TrimSpace(term), em, max)
304
305		if i > 0 {
306			switch operators[i-1] {
307			case "+":
308				result += value
309			case "-":
310				result -= value
311			case "*":
312				result *= value
313			case "/":
314				if value != 0 {
315					result /= value
316				} else {
317					return 0
318				}
319			}
320		} else {
321			result = value
322		}
323	}
324
325	return result
326}
327
328func Merge(m1, m2 map[string]string) map[string]string {
329	// Create a new map and copy m1 into it
330	result := make(map[string]string)
331	for k, v := range m1 {
332		result[k] = v
333	}
334
335	// Merge m2 into the new map
336	for k, v := range m2 {
337		result[k] = v
338	}
339
340	return result
341}
342
343func Max(a, b float32) float32 {
344	if a > b {
345		return a
346	} else {
347		return b
348	}
349}
350
351func Min(a, b float32) float32 {
352	if a < b {
353		return a
354	} else {
355		return b
356	}
357}
358
359// getStructField uses reflection to get the value of a struct field by name
360func GetStructField(data interface{}, fieldName string) interface{} {
361	val := reflect.ValueOf(data)
362
363	// Make sure we have a pointer to a struct
364	if val.Kind() != reflect.Ptr || val.Elem().Kind() != reflect.Struct {
365		return nil
366	}
367
368	// Get the struct field by name
369	field := val.Elem().FieldByName(fieldName)
370
371	// Check if the field exists
372	if !field.IsValid() {
373		return nil
374	}
375
376	return field.Interface()
377}
378
379func SetStructFieldValue(data interface{}, fieldName string, newValue interface{}) {
380	val := reflect.ValueOf(data)
381
382	// Make sure we have a pointer to a struct
383	if val.Kind() != reflect.Ptr || val.Elem().Kind() != reflect.Struct {
384		return
385	}
386
387	// Get the struct field by name
388	field := val.Elem().FieldByName(fieldName)
389
390	// Check if the field exists
391	if !field.IsValid() {
392		return
393	}
394
395	// Check if the new value type is assignable to the field type
396	if !reflect.ValueOf(newValue).Type().AssignableTo(field.Type()) {
397		return
398	}
399
400	// Set the new value
401	field.Set(reflect.ValueOf(newValue))
402
403}
404
405// func Check(e error) {
406// 	if e != nil {
407// 		panic(e)
408// 	}
409// }
410
411func GetInnerText(n *html.Node) string {
412	var result strings.Builder
413
414	var getText func(*html.Node)
415	getText = func(n *html.Node) {
416		// Skip processing if the node is a head tag
417		if n.Type == html.ElementNode && n.Data == "head" {
418			return
419		}
420
421		// If it's a text node, append its content
422		if n.Type == html.TextNode {
423			result.WriteString(n.Data)
424		}
425
426		// Traverse child nodes recursively
427		for c := n.FirstChild; c != nil; c = c.NextSibling {
428			getText(c)
429		}
430	}
431
432	getText(n)
433
434	return result.String()
435}
436
437func GetPositionOffsetNode(n *element.Node) *element.Node {
438	pos := n.Style["position"]
439
440	if pos == "relative" {
441		return n
442	} else {
443		if n.Parent.TagName != "ROOT" {
444			if n.Parent.Style != nil {
445				return GetPositionOffsetNode(n.Parent)
446			} else {
447				return nil
448			}
449		} else {
450			return n.Parent
451		}
452	}
453}
454
455func IsParent(n element.Node, name string) bool {
456	if n.Parent.TagName != "ROOT" {
457		if n.Parent.TagName == name {
458			return true
459		} else {
460			return IsParent(*n.Parent, name)
461		}
462	} else {
463		return false
464	}
465}
466
467func ChildrenHaveText(n *element.Node) bool {
468	for _, child := range n.Children {
469		if len(strings.TrimSpace(child.InnerText)) != 0 {
470			return true
471		}
472		// Recursively check if any child nodes have text
473		if ChildrenHaveText(&child) {
474			return true
475		}
476	}
477	return false
478}
479
480func NodeToHTML(node element.Node) (string, string) {
481	// if node.TagName == "notaspan" {
482	// 	return node.InnerText + " ", ""
483	// }
484
485	var buffer bytes.Buffer
486	buffer.WriteString("<" + node.TagName)
487
488	if node.Properties.Editable {
489		buffer.WriteString(" contentEditable=\"true\"")
490	}
491
492	// Add ID if present
493	if node.Id != "" {
494		buffer.WriteString(" id=\"" + node.Id + "\"")
495	}
496
497	// Add ID if present
498	if node.Title != "" {
499		buffer.WriteString(" title=\"" + node.Title + "\"")
500	}
501
502	// Add ID if present
503	if node.Src != "" {
504		buffer.WriteString(" src=\"" + node.Src + "\"")
505	}
506
507	// Add ID if present
508	if node.Href != "" {
509		buffer.WriteString(" href=\"" + node.Href + "\"")
510	}
511
512	// Add class list if present
513	if len(node.ClassList.Classes) > 0 || node.ClassList.Value != "" {
514		classes := ""
515		for _, v := range node.ClassList.Classes {
516			if len(v) > 0 {
517				if string(v[0]) != ":" {
518					classes += v + " "
519				}
520			}
521		}
522		classes = strings.TrimSpace(classes)
523		if len(classes) > 0 {
524			buffer.WriteString(" class=\"" + classes + "\"")
525		}
526	}
527
528	// Add style if present
529	if len(node.Style) > 0 {
530
531		style := ""
532		for key, value := range node.Style {
533			if key != "inlineText" {
534				style += key + ":" + value + ";"
535			}
536		}
537		style = strings.TrimSpace(style)
538
539		if len(style) > 0 {
540			buffer.WriteString(" style=\"" + style + "\"")
541		}
542	}
543
544	// Add other attributes if present
545	for key, value := range node.Attribute {
546		if strings.TrimSpace(value) != "" {
547			buffer.WriteString(" " + key + "=\"" + value + "\"")
548		}
549	}
550
551	buffer.WriteString(">")
552
553	// Add inner text if present
554	if node.InnerText != "" && !ChildrenHaveText(&node) {
555		buffer.WriteString(node.InnerText)
556	}
557	return buffer.String(), "</" + node.TagName + ">"
558}
559
560func OuterHTML(node element.Node) string {
561	var buffer bytes.Buffer
562
563	tag, closing := NodeToHTML(node)
564
565	buffer.WriteString(tag)
566
567	// Recursively add children
568	for _, child := range node.Children {
569		buffer.WriteString(OuterHTML(child))
570	}
571
572	buffer.WriteString(closing)
573
574	return buffer.String()
575}
576
577func InnerHTML(node element.Node) string {
578	var buffer bytes.Buffer
579	// Recursively add children
580	for _, child := range node.Children {
581		buffer.WriteString(OuterHTML(child))
582	}
583	return buffer.String()
584}
585
586func ReverseSlice[T any](s []T) {
587	for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 {
588		s[i], s[j] = s[j], s[i]
589	}
590}
591
592func ParentStyleProp(n *element.Node, prop string, selector func(string) bool) bool {
593	if n.Parent != nil {
594		if selector(n.Parent.Style[prop]) {
595			return true
596		} else {
597			return ParentStyleProp(n.Parent, prop, selector)
598		}
599	}
600	return false
601}