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	"math"
  8	"reflect"
  9	"regexp"
 10	"strconv"
 11	"strings"
 12
 13	"golang.org/x/net/html"
 14)
 15
 16// MapToInlineCSS converts a map[string]string to a string formatted like inline CSS style
 17func MapToInline(m map[string]string) string {
 18	var cssStrings []string
 19	for key, value := range m {
 20		cssStrings = append(cssStrings, fmt.Sprintf("%s: %s;", key, value))
 21	}
 22	return strings.Join(cssStrings, " ")
 23}
 24
 25// InlineCSSToMap converts a string formatted like inline CSS style to a map[string]string
 26func InlineToMap(cssString string) map[string]string {
 27	cssMap := make(map[string]string)
 28	declarations := strings.Split(cssString, ";")
 29	for _, declaration := range declarations {
 30		parts := strings.Split(strings.TrimSpace(declaration), ":")
 31		if len(parts) == 2 {
 32			key := strings.TrimSpace(parts[0])
 33			value := strings.TrimSpace(parts[1])
 34			cssMap[key] = value
 35		}
 36	}
 37	return cssMap
 38}
 39
 40func GetXY(n *element.Node, state *map[string]element.State) (float32, float32) {
 41	s := *state
 42	// self := s[n.Properties.Id]
 43
 44	offsetX := float32(0)
 45	offsetY := float32(0)
 46
 47	if n.Parent != nil {
 48		parent := s[n.Parent.Properties.Id]
 49		// x, y := GetXY(n.Parent, state)
 50		offsetX += parent.Border.Width + parent.Padding.Left
 51		offsetY += parent.Border.Width + parent.Padding.Top
 52	}
 53
 54	return offsetX, offsetY
 55}
 56
 57type WidthHeight struct {
 58	Width  float32
 59	Height float32
 60}
 61
 62func GetWH(n element.Node, state *map[string]element.State) WidthHeight {
 63	s := *state
 64	self := s[n.Properties.Id]
 65
 66	if n.Style == nil {
 67		n.Style = map[string]string{}
 68	}
 69
 70	fs := self.EM
 71
 72	var pwh WidthHeight
 73	if n.Parent != nil {
 74		pwh = GetWH(*n.Parent, state)
 75	} else {
 76		pwh = WidthHeight{}
 77		if n.Style["width"] != "" {
 78			str := strings.TrimSuffix(n.Style["width"], "px")
 79			// Convert the string to float32
 80			f, _ := strconv.ParseFloat(str, 32)
 81			pwh.Width = float32(f)
 82		}
 83
 84		if n.Style["height"] != "" {
 85			str := strings.TrimSuffix(n.Style["height"], "px")
 86			// Convert the string to float32
 87			f, _ := strconv.ParseFloat(str, 32)
 88			pwh.Height = float32(f)
 89		}
 90	}
 91
 92	width, _ := ConvertToPixels(n.Style["width"], fs, pwh.Width)
 93	height, _ := ConvertToPixels(n.Style["height"], fs, pwh.Height)
 94
 95	if n.Style["min-width"] != "" {
 96		minWidth, _ := ConvertToPixels(n.Style["min-width"], fs, pwh.Width)
 97		width = Max(width, minWidth)
 98	}
 99
100	if n.Style["max-width"] != "" {
101		maxWidth, _ := ConvertToPixels(n.Style["max-width"], fs, pwh.Width)
102		width = Min(width, maxWidth)
103	}
104	if n.Style["min-height"] != "" {
105		minHeight, _ := ConvertToPixels(n.Style["min-height"], fs, pwh.Height)
106		height = Max(height, minHeight)
107	}
108
109	if n.Style["max-height"] != "" {
110		maxHeight, _ := ConvertToPixels(n.Style["max-height"], fs, pwh.Height)
111		height = Min(height, maxHeight)
112	}
113
114	wh := WidthHeight{
115		Width:  width,
116		Height: height,
117	}
118
119	if n.Parent != nil {
120		wh.Width += self.Padding.Left + self.Padding.Right
121		wh.Height += self.Padding.Top + self.Padding.Bottom
122		// fmt.Println(n.Properties.Id, wh, p)
123	}
124
125	if n.Style["width"] == "100%" {
126		wh.Width -= (self.Margin.Right + self.Margin.Left + (self.Border.Width * 2))
127	}
128
129	if n.Style["height"] == "100%" {
130		wh.Height -= (self.Margin.Top + self.Margin.Bottom)
131	}
132
133	return wh
134}
135
136func GetMP(n element.Node, wh WidthHeight, state *map[string]element.State, t string) element.MarginPadding {
137	s := *state
138	self := s[n.Properties.Id]
139	fs := self.EM
140	m := element.MarginPadding{}
141
142	if n.Style[t] != "" {
143		left, right, top, bottom := convertMarginToIndividualProperties(n.Style[t])
144		if n.Style[t+"-left"] == "" {
145			n.Style[t+"-left"] = left
146		}
147		if n.Style[t+"-right"] == "" {
148			n.Style[t+"-right"] = right
149		}
150		if n.Style[t+"-top"] == "" {
151			n.Style[t+"-top"] = top
152		}
153		if n.Style[t+"-bottom"] == "" {
154			n.Style[t+"-bottom"] = bottom
155		}
156	}
157	if n.Style[t+"-left"] != "" || n.Style[t+"-right"] != "" {
158		l, _ := ConvertToPixels(n.Style[t+"-left"], fs, wh.Width)
159		r, _ := ConvertToPixels(n.Style[t+"-right"], fs, wh.Width)
160		m.Left = l
161		m.Right = r
162	}
163	if n.Style[t+"-top"] != "" || n.Style[t+"-bottom"] != "" {
164		top, _ := ConvertToPixels(n.Style[t+"-top"], fs, wh.Height)
165		b, _ := ConvertToPixels(n.Style[t+"-bottom"], fs, wh.Height)
166		m.Top = top
167		m.Bottom = b
168	}
169	if t == "margin" {
170		if n.Style["margin"] == "auto" && n.Style["margin-left"] == "" && n.Style["margin-right"] == "" {
171			pwh := GetWH(*n.Parent, state)
172			m.Left = Max((pwh.Width-wh.Width)/2, 0)
173			m.Right = m.Left
174		}
175	}
176
177	return m
178}
179
180func convertMarginToIndividualProperties(margin string) (string, string, string, string) {
181	// Remove extra whitespace
182	margin = strings.TrimSpace(margin)
183
184	if margin == "" {
185		return "0px", "0px", "0px", "0px"
186	}
187
188	// Regular expression to match values with optional units
189	re := regexp.MustCompile(`(-?\d+(\.\d+)?)(\w*|\%)?`)
190
191	// Extract numerical values from the margin property
192	matches := re.FindAllStringSubmatch(margin, -1)
193
194	// Initialize variables for individual margins
195	var left, right, top, bottom string
196
197	switch len(matches) {
198	case 1:
199		// If only one value is provided, apply it to all margins
200		left = matches[0][0]
201		right = matches[0][0]
202		top = matches[0][0]
203		bottom = matches[0][0]
204	case 2:
205		// If two values are provided, apply the first to top and bottom, and the second to left and right
206		top = matches[0][0]
207		bottom = matches[0][0]
208		left = matches[1][0]
209		right = matches[1][0]
210	case 3:
211		// If three values are provided, apply the first to top, the second to left and right, and the third to bottom
212		top = matches[0][0]
213		left = matches[1][0]
214		right = matches[1][0]
215		bottom = matches[2][0]
216	case 4:
217		// If four values are provided, apply them to top, right, bottom, and left, respectively
218		top = matches[0][0]
219		right = matches[1][0]
220		bottom = matches[2][0]
221		left = matches[3][0]
222	}
223
224	return left, right, top, bottom
225}
226
227// ConvertToPixels converts a CSS measurement to pixels.
228func ConvertToPixels(value string, em, max float32) (float32, error) {
229	unitFactors := map[string]float32{
230		"px": 1,
231		"em": em,
232		"pt": 1.33,
233		"pc": 16.89,
234		"%":  max / 100,
235		"vw": max / 100,
236		"vh": max / 100,
237		"cm": 37.79527559,
238		"in": 96,
239	}
240
241	if strings.HasPrefix(value, "calc(") {
242		// Handle calculation expression
243		calcResult, err := evaluateCalcExpression(value[5:len(value)-1], em, max)
244		if err != nil {
245			return 0, err
246		}
247		return calcResult, nil
248	} else {
249		// Extract numeric value and unit
250		for k, v := range unitFactors {
251			if strings.HasSuffix(value, k) {
252				cutStr, _ := strings.CutSuffix(value, k)
253				numericValue, _ := strconv.ParseFloat(cutStr, 64)
254				return float32(numericValue) * v, nil
255			}
256		}
257		return 0, fmt.Errorf("unable to parse value")
258	}
259
260}
261
262// evaluateCalcExpression recursively evaluates 'calc()' expressions
263func evaluateCalcExpression(expression string, em, max float32) (float32, error) {
264	terms := strings.FieldsFunc(expression, func(c rune) bool {
265		return c == '+' || c == '-' || c == '*' || c == '/'
266	})
267
268	operators := strings.FieldsFunc(expression, func(c rune) bool {
269		return c != '+' && c != '-' && c != '*' && c != '/'
270	})
271
272	var result float32
273
274	for i, term := range terms {
275		value, err := ConvertToPixels(strings.TrimSpace(term), em, max)
276		if err != nil {
277			return 0, err
278		}
279
280		if i > 0 {
281			switch operators[i-1] {
282			case "+":
283				result += value
284			case "-":
285				result -= value
286			case "*":
287				result *= value
288			case "/":
289				if value != 0 {
290					result /= value
291				} else {
292					return 0, fmt.Errorf("division by zero in 'calc()' expression")
293				}
294			}
295		} else {
296			result = value
297		}
298	}
299
300	return result, nil
301}
302
303func GetTextBounds(text string, fontSize, width, height float32) (float32, float32) {
304	w := float32(len(text) * int(fontSize))
305	h := fontSize
306	if width > 0 && height > 0 {
307		if w > width {
308			height = Max(height, float32(math.Ceil(float64(w/width)))*h)
309		}
310		return width, height
311	} else {
312		return w, h
313	}
314
315}
316
317func Merge(m1, m2 map[string]string) map[string]string {
318	// Create a new map and copy m1 into it
319	result := make(map[string]string)
320	for k, v := range m1 {
321		result[k] = v
322	}
323
324	// Merge m2 into the new map
325	for k, v := range m2 {
326		result[k] = v
327	}
328
329	return result
330}
331
332func ExMerge(m1, m2 map[string]string) map[string]string {
333	// Create a new map and copy m1 into it
334	result := make(map[string]string)
335	for k, v := range m1 {
336		result[k] = v
337	}
338
339	// Merge m2 into the new map only if the key is not already present
340	for k, v := range m2 {
341		if result[k] == "" {
342			result[k] = v
343		}
344	}
345
346	return result
347}
348
349func Max(a, b float32) float32 {
350	if a > b {
351		return a
352	} else {
353		return b
354	}
355}
356
357func Min(a, b float32) float32 {
358	if a < b {
359		return a
360	} else {
361		return b
362	}
363}
364
365func FindRelative(n *element.Node, styleMap map[string]map[string]string) (float32, float32) {
366	pos := styleMap[n.Properties.Id]["position"]
367
368	if pos == "relative" {
369		x, _ := strconv.ParseFloat(styleMap[n.Properties.Id]["x"], 32)
370		y, _ := strconv.ParseFloat(styleMap[n.Properties.Id]["y"], 32)
371		return float32(x), float32(y)
372	} else {
373		if n.Parent != nil {
374			x, y := FindRelative(n.Parent, styleMap)
375			return x, y
376		} else {
377			return 0, 0
378		}
379	}
380}
381
382func ParseFloat(str string, def float32) float32 {
383	var a float32
384	if str == "" {
385		a = 0
386	} else {
387		v, _ := strconv.ParseFloat(str, 32)
388		a = float32(v)
389	}
390	return a
391}
392
393// getStructField uses reflection to get the value of a struct field by name
394func GetStructField(data interface{}, fieldName string) (interface{}, error) {
395	val := reflect.ValueOf(data)
396
397	// Make sure we have a pointer to a struct
398	if val.Kind() != reflect.Ptr || val.Elem().Kind() != reflect.Struct {
399		return nil, fmt.Errorf("expected a pointer to a struct")
400	}
401
402	// Get the struct field by name
403	field := val.Elem().FieldByName(fieldName)
404
405	// Check if the field exists
406	if !field.IsValid() {
407		return nil, fmt.Errorf("field not found: %s", fieldName)
408	}
409
410	return field.Interface(), nil
411}
412
413func SetStructFieldValue(data interface{}, fieldName string, newValue interface{}) error {
414	val := reflect.ValueOf(data)
415
416	// Make sure we have a pointer to a struct
417	if val.Kind() != reflect.Ptr || val.Elem().Kind() != reflect.Struct {
418		return fmt.Errorf("expected a pointer to a struct")
419	}
420
421	// Get the struct field by name
422	field := val.Elem().FieldByName(fieldName)
423
424	// Check if the field exists
425	if !field.IsValid() {
426		return fmt.Errorf("field not found: %s", fieldName)
427	}
428
429	// Check if the new value type is assignable to the field type
430	if !reflect.ValueOf(newValue).Type().AssignableTo(field.Type()) {
431		return fmt.Errorf("incompatible types for field %s", fieldName)
432	}
433
434	// Set the new value
435	field.Set(reflect.ValueOf(newValue))
436
437	return nil
438}
439
440func Check(e error) {
441	if e != nil {
442		panic(e)
443	}
444}
445
446func GetInnerText(n *html.Node) string {
447	var result strings.Builder
448
449	var getText func(*html.Node)
450	getText = func(n *html.Node) {
451		if n.Type == html.TextNode {
452			result.WriteString(n.Data)
453		}
454
455		for c := n.FirstChild; c != nil; c = c.NextSibling {
456			getText(c)
457		}
458	}
459
460	getText(n)
461
462	return result.String()
463}
464
465func GetPositionOffsetNode(n *element.Node) *element.Node {
466	pos := n.Style["position"]
467
468	if pos == "relative" {
469		return n
470	} else {
471		if n.Parent.TagName != "ROOT" {
472			if n.Parent.Style != nil {
473				return GetPositionOffsetNode(n.Parent)
474			} else {
475				return nil
476			}
477		} else {
478			return n.Parent
479		}
480	}
481}
482
483func IsParent(n element.Node, name string) bool {
484	if n.Parent.TagName != "ROOT" {
485		if n.Parent.TagName == name {
486			return true
487		} else {
488			return IsParent(*n.Parent, name)
489		}
490	} else {
491		return false
492	}
493}
494
495func ChildrenHaveText(n *element.Node) bool {
496	for _, child := range n.Children {
497		if len(strings.TrimSpace(child.InnerText)) != 0 {
498			return true
499		}
500		// Recursively check if any child nodes have text
501		if ChildrenHaveText(&child) {
502			return true
503		}
504	}
505	return false
506}
507
508func NodeToHTML(node element.Node) (string, string) {
509	// if node.TagName == "notaspan" {
510	// 	return node.InnerText + " ", ""
511	// }
512
513	var buffer bytes.Buffer
514	buffer.WriteString("<" + node.TagName)
515
516	if node.Properties.Editable {
517		buffer.WriteString(" contentEditable=\"true\"")
518	}
519
520	// Add ID if present
521	if node.Id != "" {
522		buffer.WriteString(" id=\"" + node.Id + "\"")
523	}
524
525	// Add ID if present
526	if node.Title != "" {
527		buffer.WriteString(" title=\"" + node.Title + "\"")
528	}
529
530	// Add ID if present
531	if node.Src != "" {
532		buffer.WriteString(" src=\"" + node.Src + "\"")
533	}
534
535	// Add ID if present
536	if node.Href != "" {
537		buffer.WriteString(" href=\"" + node.Href + "\"")
538	}
539
540	// Add class list if present
541	if len(node.ClassList.Classes) > 0 || node.ClassList.Value != "" {
542		classes := ""
543		for _, v := range node.ClassList.Classes {
544			if string(v[0]) != ":" {
545				classes += v + " "
546			}
547		}
548		classes = strings.TrimSpace(classes)
549		if len(classes) > 0 {
550			buffer.WriteString(" class=\"" + classes + "\"")
551		}
552	}
553
554	// Add style if present
555	if len(node.Style) > 0 {
556
557		style := ""
558		for key, value := range node.Style {
559			if key != "inlineText" {
560				style += key + ":" + value + ";"
561			}
562		}
563		style = strings.TrimSpace(style)
564
565		if len(style) > 0 {
566			buffer.WriteString(" style=\"" + style + "\"")
567		}
568	}
569
570	// Add other attributes if present
571	for key, value := range node.Attribute {
572		if strings.TrimSpace(value) != "" {
573			buffer.WriteString(" " + key + "=\"" + value + "\"")
574		}
575	}
576
577	buffer.WriteString(">")
578
579	// Add inner text if present
580	if node.InnerText != "" && !ChildrenHaveText(&node) {
581		buffer.WriteString(node.InnerText)
582	}
583	return buffer.String(), "</" + node.TagName + ">"
584}
585
586func OuterHTML(node element.Node) string {
587	var buffer bytes.Buffer
588
589	tag, closing := NodeToHTML(node)
590
591	buffer.WriteString(tag)
592
593	// Recursively add children
594	for _, child := range node.Children {
595		buffer.WriteString(OuterHTML(child))
596	}
597
598	buffer.WriteString(closing)
599
600	return buffer.String()
601}
602
603func InnerHTML(node element.Node) string {
604	var buffer bytes.Buffer
605	// Recursively add children
606	for _, child := range node.Children {
607		buffer.WriteString(OuterHTML(child))
608	}
609	return buffer.String()
610}