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is-simple-class-selector.ts
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is-simple-class-selector.ts
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/**
* Check if a selector is a simple class selector.
*
* A simple class selector is a class selector that doesn't contain any other
* selector types, such as ID selectors, element selectors, attribute selectors,
* pseudo-classes, combinators, or selector lists.
*/
export function isSimpleClassSelector(selector: string): boolean {
// The selector must start with a dot, otherwise it's not a class selector.
if (selector[0] !== '.') return false
for (let i = 1; i < selector.length; i++) {
switch (selector[i]) {
// The character is escaped, skip the next character
case '\\':
i += 1
continue
case ' ': // Descendat combinator
case '.': // Class selector
case '#': // ID selector
case '[': // Attribute selector
case ':': // Pseudo-classes and pseudo-elements
case '>': // Child combinator
case '+': // Next-sibling combinator
case '~': // Subsequent-sibling combinator
case ',': // Selector list
return false
}
}
return true
}