no_empty_character_class

var NoEmptyCharacterClassRule = rule.Rule{
	Name: "no-empty-character-class",
	Run: func(ctx rule.RuleContext, options any) rule.RuleListeners {
		return rule.RuleListeners{
			ast.KindRegularExpressionLiteral: func(node *ast.Node) {
				text := node.Text()
				pattern, flags := utils.ExtractRegexPatternAndFlags(text)
				unicodeSets := strings.ContainsRune(flags, 'v')
				if hasEmptyCharacterClass(pattern, unicodeSets) {
					ctx.ReportNode(node, rule.RuleMessage{
						Id:          "unexpected",
						Description: "Empty class.",
					})
				}
			},
		}
	},
}