CStyle

daslk

# StyleSheet?(go)

# StyleTag?(go)

# GetStyles?(go)

# AddPlugin?(go)

See /cstyle/plugins/

# ComputeNodeStyle?(go)

# parseBorderShorthand?(go)

# CompleteBorder?(go)

# genTextNode?(go)

  1package cstyle
  2
  3// package aui/goldie
  4// https://pkg.go.dev/automated.sh/goldie
  5// https://pkg.go.dev/automated.sh/aui
  6// https://pkg.go.dev/automated.sh/oat
  7
  8import (
  9	"fmt"
 10	"gui/color"
 11	"gui/element"
 12	"gui/font"
 13	"gui/parser"
 14	"gui/utils"
 15	"os"
 16	"slices"
 17	"sort"
 18	"strings"
 19)
 20
 21type Plugin struct {
 22	Styles  map[string]string
 23	Level   int
 24	Handler func(*element.Node, *map[string]element.State)
 25}
 26
 27type CSS struct {
 28	Width       float32
 29	Height      float32
 30	StyleSheets []map[string]map[string]string
 31	Plugins     []Plugin
 32	Document    *element.Node
 33}
 34
 35func (c *CSS) StyleSheet(path string) {
 36	// Parse the CSS file
 37	dat, err := os.ReadFile(path)
 38	utils.Check(err)
 39	styles := parser.ParseCSS(string(dat))
 40
 41	c.StyleSheets = append(c.StyleSheets, styles)
 42}
 43
 44func (c *CSS) StyleTag(css string) {
 45	styles := parser.ParseCSS(css)
 46	c.StyleSheets = append(c.StyleSheets, styles)
 47}
 48
 49var inheritedProps = []string{
 50	"color",
 51	"cursor",
 52	"font",
 53	"font-family",
 54	"font-size",
 55	"font-style",
 56	"font-weight",
 57	"letter-spacing",
 58	"line-height",
 59	"text-align",
 60	"text-indent",
 61	"text-justify",
 62	"text-shadow",
 63	"text-transform",
 64	"visibility",
 65	"word-spacing",
 66	"display",
 67}
 68
 69func (c *CSS) GetStyles(n element.Node) map[string]string {
 70	styles := map[string]string{}
 71
 72	if n.Parent != nil {
 73		ps := c.GetStyles(*n.Parent)
 74		for _, v := range inheritedProps {
 75			if ps[v] != "" {
 76				styles[v] = ps[v]
 77			}
 78		}
 79	}
 80	for k, v := range n.Style {
 81		styles[k] = v
 82	}
 83	hovered := false
 84	if slices.Contains(n.ClassList.Classes, ":hover") {
 85		hovered = true
 86	}
 87
 88	for _, styleSheet := range c.StyleSheets {
 89		for selector := range styleSheet {
 90			// fmt.Println(selector, n.Properties.Id)
 91			key := selector
 92			if strings.Contains(selector, ":hover") && hovered {
 93				selector = strings.Replace(selector, ":hover", "", -1)
 94			}
 95			if element.TestSelector(selector, &n) {
 96				for k, v := range styleSheet[key] {
 97					styles[k] = v
 98				}
 99			}
100
101		}
102	}
103
104	// !FLAG: why is this needed, the "attribute" is n.Style that should be mapped during init
105	inline := parser.ParseStyleAttribute(n.GetAttribute("style") + ";")
106	styles = utils.Merge(styles, inline)
107	// add hover and focus css events
108
109	return styles
110}
111
112func (c *CSS) AddPlugin(plugin Plugin) {
113	c.Plugins = append(c.Plugins, plugin)
114}
115
116func CheckNode(n *element.Node, state *map[string]element.State) {
117	s := *state
118	self := s[n.Properties.Id]
119
120	fmt.Println(n.TagName, n.Properties.Id)
121	fmt.Printf("ID: %v\n", n.Id)
122	fmt.Printf("Parent: %v\n", n.Parent.TagName)
123	fmt.Printf("Classes: %v\n", n.ClassList.Classes)
124	fmt.Printf("Text: %v\n", self.Text.Text)
125	fmt.Printf("X: %v, Y: %v\n", self.X, self.Y)
126	fmt.Printf("Width: %v, Height: %v\n", self.Width, self.Height)
127	fmt.Printf("Styles: %v\n", n.Style)
128	fmt.Printf("Background: %v\n", self.Background)
129	fmt.Printf("Border: %v\n\n\n", self.Border)
130}
131
132func (c *CSS) ComputeNodeStyle(n *element.Node, state *map[string]element.State) *element.Node {
133	// Head is not renderable
134	if utils.IsParent(*n, "head") {
135		return n
136	}
137	plugins := c.Plugins
138	// !FLAG: This should add to state.Style instead as the element.Node should be un effected by the engine
139	// 		  currently this adds styles to the style attribute that the use did not explisitly set
140
141	n.Style = c.GetStyles(*n)
142	s := *state
143	self := s[n.Properties.Id]
144	parent := s[n.Parent.Properties.Id]
145
146	self.Background = color.Parse(n.Style, "background")
147	self.Border, _ = CompleteBorder(n.Style)
148
149	fs, _ := utils.ConvertToPixels(n.Style["font-size"], parent.EM, parent.Width)
150	self.EM = fs
151
152	if n.Style["display"] == "none" {
153		self.X = 0
154		self.Y = 0
155		self.Width = 0
156		self.Height = 0
157		return n
158	}
159
160	wh := utils.GetWH(*n)
161	width := wh.Width
162	height := wh.Height
163
164	x, y := parent.X, parent.Y
165
166	var top, left, right, bottom bool = false, false, false, false
167
168	m := utils.GetMP(*n, "margin")
169	p := utils.GetMP(*n, "padding")
170
171	self.Margin = m
172	self.Padding = p
173
174	if n.Style["position"] == "absolute" {
175		bas := utils.GetPositionOffsetNode(n)
176		base := s[bas.Properties.Id]
177		if n.Style["top"] != "" {
178			v, _ := utils.ConvertToPixels(n.Style["top"], self.EM, parent.Width)
179			y = v + base.Y
180			top = true
181		}
182		if n.Style["left"] != "" {
183			v, _ := utils.ConvertToPixels(n.Style["left"], self.EM, parent.Width)
184			x = v + base.X
185			left = true
186		}
187		if n.Style["right"] != "" {
188			v, _ := utils.ConvertToPixels(n.Style["right"], self.EM, parent.Width)
189			x = (base.Width - width) - v
190			right = true
191		}
192		if n.Style["bottom"] != "" {
193			v, _ := utils.ConvertToPixels(n.Style["bottom"], self.EM, parent.Width)
194			y = (base.Height - height) - v
195			bottom = true
196		}
197	} else {
198		for i, v := range n.Parent.Children {
199			if v.Properties.Id == n.Properties.Id {
200				if i-1 > 0 {
201					sib := n.Parent.Children[i-1]
202					sibling := s[sib.Properties.Id]
203					if n.Style["display"] == "inline" {
204						if sib.Style["display"] == "inline" {
205							y = sibling.Y
206						} else {
207							y = sibling.Y + sibling.Height
208						}
209					} else {
210						y = sibling.Y + sibling.Height
211					}
212				}
213				break
214			} else if n.Style["display"] != "inline" {
215				vState := s[v.Properties.Id]
216				y += vState.Margin.Top + vState.Margin.Bottom + vState.Padding.Top + vState.Padding.Bottom + vState.Height
217			}
218		}
219	}
220
221	// Display modes need to be calculated here
222
223	relPos := !top && !left && !right && !bottom
224
225	if left || relPos {
226		x += m.Left
227	}
228	if top || relPos {
229		y += m.Top
230	}
231	if right {
232		x -= m.Right
233	}
234	if bottom {
235		y -= m.Bottom
236	}
237
238	// fmt.Println(n.InnerText, len(n.Children))
239
240	if !utils.ChildrenHaveText(n) {
241		// Confirm text exists
242		if len(n.InnerText) > 0 {
243			innerWidth := width
244			innerHeight := height
245			(*state)[n.Properties.Id] = self
246			self = genTextNode(n, &innerWidth, &innerHeight, p, state)
247			width = innerWidth + p.Left + p.Right
248			height = innerHeight
249		}
250	}
251
252	self.X = x
253	self.Y = y
254	self.Width = width
255	self.Height = height
256
257	(*state)[n.Properties.Id] = self
258	(*state)[n.Parent.Properties.Id] = parent
259
260	// CheckNode(n, state)
261
262	// Call children here
263
264	var childYOffset float32
265	for i, v := range n.Children {
266		v.Parent = n
267		n.Children[i] = *c.ComputeNodeStyle(&v, state)
268		if n.Style["height"] == "" {
269			cState := s[n.Children[i].Properties.Id]
270			if n.Children[i].Style["position"] != "absolute" && cState.Y > childYOffset {
271				childYOffset = cState.Y
272				self.Height += cState.Height
273				self.Height += cState.Margin.Top
274				self.Height += cState.Margin.Bottom
275				self.Height += cState.Padding.Top
276				self.Height += cState.Padding.Bottom
277			}
278
279		}
280	}
281
282	(*state)[n.Properties.Id] = self
283
284	// Sorting the array by the Level field
285	sort.Slice(plugins, func(i, j int) bool {
286		return plugins[i].Level < plugins[j].Level
287	})
288
289	for _, v := range plugins {
290		matches := true
291		for name, value := range v.Styles {
292			if n.Style[name] != value && !(value == "*") {
293				matches = false
294			}
295		}
296		if matches {
297			v.Handler(n, state)
298		}
299	}
300
301	return n
302}
303
304func parseBorderShorthand(borderShorthand string) (element.Border, error) {
305	// Split the shorthand into components
306	borderComponents := strings.Fields(borderShorthand)
307
308	// Ensure there are at least 1 component (width or style or color)
309	if len(borderComponents) >= 1 {
310		width := "0px" // Default width
311		style := "solid"
312		borderColor := "#000000" // Default color
313
314		// Extract style and color if available
315		if len(borderComponents) >= 1 {
316			width = borderComponents[0]
317		}
318
319		// Extract style and color if available
320		if len(borderComponents) >= 2 {
321			style = borderComponents[1]
322		}
323		if len(borderComponents) >= 3 {
324			borderColor = borderComponents[2]
325		}
326
327		parsedColor, _ := color.Color(borderColor)
328
329		return element.Border{
330			Width:  width,
331			Style:  style,
332			Color:  parsedColor,
333			Radius: "", // Default radius
334		}, nil
335	}
336
337	return element.Border{}, fmt.Errorf("invalid border shorthand format")
338}
339
340func CompleteBorder(cssProperties map[string]string) (element.Border, error) {
341	border, err := parseBorderShorthand(cssProperties["border"])
342	border.Radius = cssProperties["border-radius"]
343
344	return border, err
345}
346
347func genTextNode(n *element.Node, width, height *float32, p element.MarginPadding, state *map[string]element.State) element.State {
348	s := *state
349	self := s[n.Properties.Id]
350	parent := s[n.Parent.Properties.Id]
351
352	bold, italic := false, false
353
354	if n.Style["font-weight"] == "bold" {
355		bold = true
356	}
357
358	if n.Style["font-style"] == "italic" {
359		italic = true
360	}
361
362	if self.Text.Font == nil {
363		f, _ := font.LoadFont(n.Style["font-family"], int(self.EM), bold, italic)
364		self.Text.Font = f
365	}
366
367	letterSpacing, _ := utils.ConvertToPixels(n.Style["letter-spacing"], self.EM, *width)
368	wordSpacing, _ := utils.ConvertToPixels(n.Style["word-spacing"], self.EM, *width)
369	lineHeight, _ := utils.ConvertToPixels(n.Style["line-height"], self.EM, *width)
370	if lineHeight == 0 {
371		lineHeight = self.EM + 3
372	}
373
374	self.Text.LineHeight = int(lineHeight)
375	self.Text.WordSpacing = int(wordSpacing)
376	self.Text.LetterSpacing = int(letterSpacing)
377	wb := " "
378
379	if n.Style["word-wrap"] == "break-word" {
380		wb = ""
381	}
382
383	if n.Style["text-wrap"] == "wrap" || n.Style["text-wrap"] == "balance" {
384		wb = ""
385	}
386
387	var dt float32
388
389	if n.Style["text-decoration-thickness"] == "auto" || n.Style["text-decoration-thickness"] == "" {
390		dt = 3
391	} else {
392		dt, _ = utils.ConvertToPixels(n.Style["text-decoration-thickness"], self.EM, *width)
393	}
394
395	col := color.Parse(n.Style, "font")
396
397	self.Text.Color = col
398	self.Text.DecorationColor = color.Parse(n.Style, "decoration")
399	self.Text.Align = n.Style["text-align"]
400	self.Text.WordBreak = wb
401	self.Text.WordSpacing = int(wordSpacing)
402	self.Text.LetterSpacing = int(letterSpacing)
403	self.Text.WhiteSpace = n.Style["white-space"]
404	self.Text.DecorationThickness = int(dt)
405	self.Text.Overlined = n.Style["text-decoration"] == "overline"
406	self.Text.Underlined = n.Style["text-decoration"] == "underline"
407	self.Text.LineThrough = n.Style["text-decoration"] == "linethrough"
408	self.Text.EM = int(self.EM)
409	self.Text.Width = int(parent.Width)
410	self.Text.Text = n.InnerText
411
412	if n.Style["word-spacing"] == "" {
413		self.Text.WordSpacing = font.MeasureSpace(&self.Text)
414	}
415	if parent.Width != 0 && n.Style["display"] != "inline" && n.Style["width"] == "" {
416		*width = (parent.Width - p.Right) - p.Left
417	} else if n.Style["width"] == "" {
418		*width = utils.Max(*width, float32(font.MeasureLongest(&self)))
419	} else if n.Style["width"] != "" {
420		*width, _ = utils.ConvertToPixels(n.Style["width"], self.EM, parent.Width)
421	}
422
423	self.Text.Width = int(*width)
424	self.Width = *width
425	fmt.Println(n.TagName, n.Style["width"], *width)
426	h := font.Render(&self)
427	if n.Style["height"] == "" {
428		*height = h
429	}
430
431	return self
432
433}