| 1 | function ensureValidUseOfParenthesesOrBrackets(pattern) {
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| 2 | const counts = {
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| 3 | '[': 0,
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| 4 | ']': 0,
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| 5 | '(': 0,
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| 6 | ')': 0
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| 7 | };
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| 8 | for (let i = 0; i < pattern.length; i += 1) {
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| 9 | const c = pattern.charAt(i);
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| 10 | if (c in counts) {
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| 11 | counts[c] += 1;
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| 12 | }
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| 13 | if (c === ']' && counts['['] >= counts[']']) {
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| 14 | if (counts['['] === counts[']'] + 1) {
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| 15 | throw new Error(
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| 16 | `Assertion patterns must not contain flags with brackets: '${pattern}'`
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| 17 | );
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| 18 | }
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| 19 |
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| 20 | if (counts['('] !== counts[')']) {
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| 21 | throw new Error(
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| 22 | `Assertion patterns must not contain flags with parentheses: '${pattern}'`
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| 23 | );
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| 24 | }
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| 25 |
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| 26 | if (pattern.charAt(i - 1) === '[') {
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| 27 | throw new Error(
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| 28 | `Assertion patterns must not contain empty flags: '${pattern}'`
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| 29 | );
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| 30 | }
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| 31 | } else if (c === ')' && counts['('] >= counts[')']) {
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| 32 | if (counts['('] === counts[')'] + 1) {
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| 33 | throw new Error(
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| 34 | `Assertion patterns must not contain alternations with parentheses: '${pattern}'`
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| 35 | );
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| 36 | }
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| 37 |
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| 38 | if (counts['['] !== counts[']']) {
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| 39 | throw new Error(
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| 40 | `Assertion patterns must not contain alternations with brackets: '${pattern}'`
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| 41 | );
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| 42 | }
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| 43 | }
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| 44 | }
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| 45 |
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| 46 | if (counts['['] !== counts[']']) {
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| 47 | throw new Error(
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| 48 | `Assertion patterns must not contain unbalanced brackets: '${pattern}'`
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| 49 | );
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| 50 | }
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| 51 |
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| 52 | if (counts['('] !== counts[')']) {
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| 53 | throw new Error(
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| 54 | `Assertion patterns must not contain unbalanced parentheses: '${pattern}'`
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| 55 | );
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| 56 | }
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| 57 | }
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| 58 |
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| 59 | module.exports = ensureValidUseOfParenthesesOrBrackets;
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