Parser

Parser is the CSS parser for this project, it is made up of two primary functions ParseCSS, ParseStyleAttribute, and a few other functions designed to help with the parsing.

func ParseCSS(css string) map[string]map[string]string {

# ParseCSS

 1package parser
 2
 3import (
 4 "regexp"
 5 "strings"
 6)
 7
 8func ParseCSS(css string) map[string]map[string]string {
 9 selectorMap := make(map[string]map[string]string)
10
11 // Remove comments
12 css = removeComments(css)
13
14 // Parse regular selectors and styles
15 selectorRegex := regexp.MustCompile(`([^{]+){([^}]+)}`)
16 matches := selectorRegex.FindAllStringSubmatch(css, -1)
17
18 for _, match := range matches {
19  selectorBlock := strings.TrimSpace(match[1])
20  styleBlock := match[2]
21
22  selectors := parseSelectors(selectorBlock)
23  for _, selector := range selectors {
24   selectorMap[selector] = parseStyles(styleBlock)
25  }
26 }
27
28 return selectorMap
29}
30
31func parseSelectors(selectorBlock string) []string {
32 // Split by comma and trim each selector
33 selectors := strings.Split(selectorBlock, ",")
34 for i, selector := range selectors {
35  selectors[i] = strings.TrimSpace(selector)
36 }
37 return selectors
38}
39
40func parseStyles(styleBlock string) map[string]string {
41 styleRegex := regexp.MustCompile(`([a-zA-Z-]+)\s*:\s*([^;]+);`)
42 matches := styleRegex.FindAllStringSubmatch(styleBlock, -1)
43
44 styleMap := make(map[string]string)
45 for _, match := range matches {
46  propName := strings.TrimSpace(match[1])
47  propValue := strings.TrimSpace(match[2])
48  styleMap[propName] = propValue
49 }
50
51 return styleMap
52}
53
54func ParseStyleAttribute(styleValue string) map[string]string {
55 styleMap := make(map[string]string)
56
57 // Regular expression to match key-value pairs in the style attribute
58 re := regexp.MustCompile(`\s*([\w-]+)\s*:\s*([^;]+)\s*;`)
59
60 // Find all matches in the style attribute value
61 matches := re.FindAllStringSubmatch(styleValue, -1)
62
63 // Populate the map with key-value pairs
64 for _, match := range matches {
65  if len(match) == 3 {
66   key := strings.TrimSpace(match[1])
67   value := strings.TrimSpace(match[2])
68   styleMap[key] = value
69  }
70 }
71
72 return styleMap
73}
74
75func removeComments(css string) string {
76 commentRegex := regexp.MustCompile(`(?s)/\*.*?\*/`)
77 return commentRegex.ReplaceAllString(css, "")
78}
79