62 lines
1.6 KiB
Plaintext
62 lines
1.6 KiB
Plaintext
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let matchingBrackets = new Map([
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['{', '}'],
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['[', ']'],
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['(', ')'],
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])
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let inverseMatchingBrackets = new Map(
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Array.from(matchingBrackets.entries()).map(([k, v]) => [v, k])
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)
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let quotes = new Set(['"', "'", '`'])
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// Arbitrary values must contain balanced brackets (), [] and {}. Escaped
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// values don't count, and brackets inside quotes also don't count.
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//
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// E.g.: w-[this-is]w-[weird-and-invalid]
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// E.g.: w-[this-is\\]w-\\[weird-but-valid]
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// E.g.: content-['this-is-also-valid]-weirdly-enough']
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export default function isSyntacticallyValidPropertyValue(value) {
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let stack = []
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let inQuotes = false
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for (let i = 0; i < value.length; i++) {
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let char = value[i]
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if (char === ':' && !inQuotes && stack.length === 0) {
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return false
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}
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// Non-escaped quotes allow us to "allow" anything in between
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if (quotes.has(char) && value[i - 1] !== '\\') {
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inQuotes = !inQuotes
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}
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if (inQuotes) continue
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if (value[i - 1] === '\\') continue // Escaped
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if (matchingBrackets.has(char)) {
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stack.push(char)
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} else if (inverseMatchingBrackets.has(char)) {
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let inverse = inverseMatchingBrackets.get(char)
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// Nothing to pop from, therefore it is unbalanced
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if (stack.length <= 0) {
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return false
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}
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// Popped value must match the inverse value, otherwise it is unbalanced
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if (stack.pop() !== inverse) {
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return false
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}
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}
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}
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// If there is still something on the stack, it is also unbalanced
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if (stack.length > 0) {
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return false
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}
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// All good, totally balanced!
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return true
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}
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