54 lines
2.1 KiB
JavaScript
54 lines
2.1 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.countToggledBits = countToggledBits;
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exports.computeNextFlags = computeNextFlags;
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exports.computeTogglePositions = computeTogglePositions;
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exports.computeFlagsFromChars = computeFlagsFromChars;
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exports.applyFlagsOnChars = applyFlagsOnChars;
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const globals_1 = require("../../../utils/globals");
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function countToggledBits(n) {
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let count = 0;
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while (n > (0, globals_1.BigInt)(0)) {
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if (n & (0, globals_1.BigInt)(1))
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++count;
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n >>= (0, globals_1.BigInt)(1);
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}
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return count;
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}
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function computeNextFlags(flags, nextSize) {
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const allowedMask = ((0, globals_1.BigInt)(1) << (0, globals_1.BigInt)(nextSize)) - (0, globals_1.BigInt)(1);
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const preservedFlags = flags & allowedMask;
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let numMissingFlags = countToggledBits(flags - preservedFlags);
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let nFlags = preservedFlags;
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for (let mask = (0, globals_1.BigInt)(1); mask <= allowedMask && numMissingFlags !== 0; mask <<= (0, globals_1.BigInt)(1)) {
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if (!(nFlags & mask)) {
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nFlags |= mask;
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--numMissingFlags;
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}
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}
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return nFlags;
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}
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function computeTogglePositions(chars, toggleCase) {
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const positions = [];
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for (let idx = chars.length - 1; idx !== -1; --idx) {
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if (toggleCase(chars[idx]) !== chars[idx])
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(0, globals_1.safePush)(positions, idx);
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}
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return positions;
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}
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function computeFlagsFromChars(untoggledChars, toggledChars, togglePositions) {
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let flags = (0, globals_1.BigInt)(0);
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for (let idx = 0, mask = (0, globals_1.BigInt)(1); idx !== togglePositions.length; ++idx, mask <<= (0, globals_1.BigInt)(1)) {
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if (untoggledChars[togglePositions[idx]] !== toggledChars[togglePositions[idx]]) {
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flags |= mask;
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}
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}
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return flags;
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}
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function applyFlagsOnChars(chars, flags, togglePositions, toggleCase) {
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for (let idx = 0, mask = (0, globals_1.BigInt)(1); idx !== togglePositions.length; ++idx, mask <<= (0, globals_1.BigInt)(1)) {
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if (flags & mask)
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chars[togglePositions[idx]] = toggleCase(chars[togglePositions[idx]]);
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}
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}
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