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25 lines
650 B
JavaScript
25 lines
650 B
JavaScript
/**
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Binary search on a sorted flat array of [start, end] pairs.
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@param {number[]} ranges - Flat array of inclusive [start, end] range pairs, e.g. [0, 5, 10, 20].
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@param {number} codePoint - The value to search for.
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@returns {boolean} Whether the value falls within any of the ranges.
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*/
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export const isInRange = (ranges, codePoint) => {
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let low = 0;
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let high = Math.floor(ranges.length / 2) - 1;
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while (low <= high) {
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const mid = Math.floor((low + high) / 2);
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const i = mid * 2;
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if (codePoint < ranges[i]) {
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high = mid - 1;
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} else if (codePoint > ranges[i + 1]) {
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low = mid + 1;
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} else {
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return true;
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}
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}
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return false;
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};
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