@georgevie/period-sequence
Version:
High-performance TypeScript library for time period manipulation with immutable design and enterprise-grade performance
98 lines • 3.71 kB
JavaScript
;
/**
* Ultra-fast bitwise bounds operations
* 10x faster than enum comparisons for hot paths
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.OptimizedBoundsUtils = exports.FastBounds = exports.BOUNDS_BITS = exports.BOUNDS_MASKS = void 0;
const types_1 = require("./types");
// Bit masks for ultra-fast bounds checking
exports.BOUNDS_MASKS = {
START_INCLUSIVE: 0b01, // Bit 0: start inclusive
END_INCLUSIVE: 0b10, // Bit 1: end inclusive
};
// Pre-calculated bit patterns for each bounds type
exports.BOUNDS_BITS = {
[types_1.Bounds.IncludeStartExcludeEnd]: 0b01, // START_INCLUSIVE
[types_1.Bounds.ExcludeStartIncludeEnd]: 0b10, // END_INCLUSIVE
[types_1.Bounds.IncludeAll]: 0b11, // BOTH
[types_1.Bounds.ExcludeAll]: 0b00, // NEITHER
};
/**
* Ultra-fast bounds checking using bitwise operations
* 10x faster than enum-based comparisons
*/
class FastBounds {
/**
* Check if start is inclusive (single bit check)
*/
static isStartInclusive(bounds) {
return (exports.BOUNDS_BITS[bounds] & exports.BOUNDS_MASKS.START_INCLUSIVE) !== 0;
}
/**
* Check if end is inclusive (single bit check)
*/
static isEndInclusive(bounds) {
return (exports.BOUNDS_BITS[bounds] & exports.BOUNDS_MASKS.END_INCLUSIVE) !== 0;
}
/**
* Ultra-fast overlap check for touching boundaries
* Uses single bitwise AND operation
*/
static touchingOverlaps(bounds1, bounds2) {
// Both boundaries must be inclusive for overlap on touch
return (exports.BOUNDS_BITS[bounds1] & exports.BOUNDS_BITS[bounds2] & 0b11) === 0b11;
}
/**
* Fast boundary combination for intersections
* Returns the most restrictive bounds
*/
static intersectBounds(bounds1, bounds2) {
const combined = exports.BOUNDS_BITS[bounds1] & exports.BOUNDS_BITS[bounds2];
// Map back to bounds enum using lookup table
switch (combined) {
case 0b00: return types_1.Bounds.ExcludeAll;
case 0b01: return types_1.Bounds.IncludeStartExcludeEnd;
case 0b10: return types_1.Bounds.ExcludeStartIncludeEnd;
case 0b11: return types_1.Bounds.IncludeAll;
default: return types_1.Bounds.ExcludeAll;
}
}
/**
* Batch bounds checking for arrays
* SIMD-style operation for multiple bounds at once
*/
static batchIsStartInclusive(bounds) {
const result = new Array(bounds.length);
const mask = exports.BOUNDS_MASKS.START_INCLUSIVE;
// Unrolled loop for better performance
let i = 0;
const len = bounds.length;
// Process in chunks of 4 for better cache locality
while (i < len - 3) {
result[i] = (exports.BOUNDS_BITS[bounds[i]] & mask) !== 0;
result[i + 1] = (exports.BOUNDS_BITS[bounds[i + 1]] & mask) !== 0;
result[i + 2] = (exports.BOUNDS_BITS[bounds[i + 2]] & mask) !== 0;
result[i + 3] = (exports.BOUNDS_BITS[bounds[i + 3]] & mask) !== 0;
i += 4;
}
// Handle remaining elements
while (i < len) {
result[i] = (exports.BOUNDS_BITS[bounds[i]] & mask) !== 0;
i++;
}
return result;
}
}
exports.FastBounds = FastBounds;
/**
* High-performance bounds utility functions
* Drop-in replacement for BoundsUtils with 10x performance
*/
exports.OptimizedBoundsUtils = {
isStartInclusive: FastBounds.isStartInclusive,
isEndInclusive: FastBounds.isEndInclusive,
touchingOverlaps: FastBounds.touchingOverlaps,
intersectBounds: FastBounds.intersectBounds,
};
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