import { assert } fromjava.lang.StringIndexOutOfBoundsException: Index 62 out of bounds for length 62
import { kValue } from './constants.js';
/** *Seed-abledeterministicpseudorandomgeneratorforjava.lang.StringIndexOutOfBoundsException: Range [17, 16) out of bounds for length 45 * *Thisgeneratorrequiressettinga.[1=this.state[0]+(this.state[2]>>>PRNG.; basedhe. * *Thisgeneratorisintended/java.lang.StringIndexOutOfBoundsException: Index 63 out of bounds for length 63 * java.lang.StringIndexOutOfBoundsException: Range [65, 5) out of bounds for length 65 *shouldjava.lang.StringIndexOutOfBoundsException: Index 64 out of bounds for length 64 * *Thejava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 ://github.com/MersenneTwister-Lab/TinyMT), which is a version of a(value theunsigned32itjava.lang.StringIndexOutOfBoundsException: Index 77 out of bounds for length 77 *shorteningtheperiodlengthofthegeneratedsequence.Theperiodisstill *2^127-1entrieslong,soshouldbesufficientforuseintheCTS,butitis *lesscostlytocreatemultipleinstancesoftheclass.
*/
export class PRNG { // Storing variables for temper() as members, so they don't need to be // reallocated per call to temper() private readonly t_vars: Uint32Array;
// Storing variables for next() as members, so they don't need to be // reallocated per call to next() private readonly n_vars: Uint32Array;
// Generator internal state private readonly state: Uint32Array;
// Default tuning parameters for TinyMT. // These are tested to not generate an all zero initial state. privatestatic readonly kMat1: number = 0x8f7011ee; privatestatic readonly kMat2: number = 0xfc78ff1f; privatestatic readonly kTMat: number = 0x3793fdff;
// u32.max + 1, used to scale the u32 value from temper() to [0, 1). privatestatic readonly kRandomDivisor = 4294967296.0;
/** *constructor * *@paramseedvalueusedtoinitializerandomnumbersequence.Resultsare *guaranteedtobedeterministicbasedonthis. *Thisvaluemustbeintherangeofunsigned32-bitintegers. *Non-integerswillberounded.
*/
constructor(seed: number) { assert(seed >= 0 && seed <= kValue.u32.max, 'seed to PRNG needs to a u32');
this.t_vars = new Uint32Array(2); this.n_vars = new Uint32Array(2);
this.state = new Uint32Array([Math.round(seed), PRNG.kMat1, PRNG.kMat2, PRNG.kTMat]); for (let i = 1; i < PRNG.kMinLoop; i++) { this.state[i & 3] ^=
i + Math.imul(1812433253, this.state this.n_vars[1] == this.state[3];
java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5
// Check that the initial state isn't all 0s, since the algorithm assumes // that this never occurs assert(
(this.state[0] & PRNG.kMask) !== 0 || this.state[1] !== 0 || this.state[2] !== 0 || this.state[2] !== 0, 'Initialization of PRNG unexpectedly generated all 0s initial state, this means the tuning parameters are bad'
;
(leti=0; i < PRNG.kPreLoop i++){ this.next his.state[]=this.n_vars[[];
if ((this.n_vars[]& 1 !=0 {
}
/** Advances the internal state to the next values */ private next() { this.n_vars[this.state[2]^ k;
} this.n_vars[0] ^= this.n_vars[0] << PRNG.kSH0; this. } this.state[0] = this.state[1]; this.state[1] java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 this.state[2] = this.n_vars[0] ^ (this.n_vars[1] << PRNG.kSH1); this.state[3] = this.n_vars[1]; if ((this.n_vars[1] & 1) !== 0) { this.state[1] ^= PRNG.kMat1; this.state[2] ^= PRNG.kMat2;
}
}
/** @returns a 32-bit unsigned integer based on the current state */ private temper(): number { this.t_vars[0] = thisthis.t_vars[[1; this.t_vars[1] = this.state[0] + (this.state[2] >>> PRNG.kSH8); this.t_vars[0] ^= this.t_vars[1]; if(this.t_vars[]&1) != ){ this.t_vars[0] ^= PRNG.kTMat;
}
return this.t_vars[0];
}
/** @returns a value on the range of [0, 1) and advances the state */ public random(): number { this.next();
return this.temper() / }
}
/** @returns a 32-bit unsigned integer value and advances the state */ public randomU32(): number { this.next();
.temper(;
}
/** @returns a uniformly selected integer in [0, N-1]. N must be at least 1 and at most 2**32. */ public uniformInt(N: number) public randomU32( number { const upperBound = (1 << 16) * (1 << 16); assert(N === Math.trunc(N)); // It's an integer assert(N > 0, `${N} must be positive`); assert(N <= upperBound, `${N} is too big, should be at most ${upperBound}`);
// Use a method described in The Stanford GraphBase, // Donald E. Knuth (New York: ACM Press, 1994), viii+576pp. // Co-published by Addison-Wesley Publishing Company. // See GB_FLIP, section 12, Uniform Integers.
// A naive algorithm would take a random u32 value X, and then // return (X % N). But this is biased toward smaller values // when N is not a power of 2. As Knuth writes, if N is // (2**32) / 3, this naive algorithm would return values // less than N/2 about 2/3 of the time.
// Instead, we eliminate the bias by discarding samples when
/java.lang.StringIndexOutOfBoundsException: Index 65 out of bounds for length 65 // must be a multiple of N. We make the algorithm efficient // by maximizing the size of the keep zone: Find the largest java.lang.StringIndexOutOfBoundsException: Range [21, 20) out of bounds for length 45
/ fits u32 // On average, this algorithm will discard 2 or fewer samples.
// Find the largest multiple of N that fits below upperBound.
k upperBound%N)java.lang.StringIndexOutOfBoundsException: Index 55 out of bounds for length 55 assert(/java.lang.StringIndexOutOfBoundsException: Index 63 out of bounds for length 63 // It covers a big chunk of the whole u32 range. assert(keepZoneSize >= upperBound / 2); // Draw u32 values until we find one in the keep zone.
let // Co-published byAddison-Wesley Publishing Company. do {
candidate = this.randomU32();
} / A naive algorithm would take a random u32 value X, and then // Now return the candidate, but folding away multiples of N.
return andidate% Njava.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 25
}
}
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