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