/*
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* Copyright 2007 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*namespace com.google.zxing.common {*/
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/*import java.util.Arrays;*/
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import IllegalArgumentException from '../IllegalArgumentException';
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import Arrays from '../util/Arrays';
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import Integer from '../util/Integer';
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import System from '../util/System';
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/**
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* <p>A simple, fast array of bits, represented compactly by an array of ints internally.</p>
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*
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* @author Sean Owen
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*/
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export default class BitArray /*implements Cloneable*/ {
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// public constructor() {
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// this.size = 0
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// this.bits = new Int32Array(1)
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// }
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// public constructor(size?: number /*int*/) {
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// if (undefined === size) {
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// this.size = 0
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// } else {
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// this.size = size
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// }
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// this.bits = this.makeArray(size)
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// }
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// For testing only
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constructor(size /*int*/, bits) {
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if (undefined === size) {
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this.size = 0;
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this.bits = new Int32Array(1);
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}
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else {
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this.size = size;
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if (undefined === bits || null === bits) {
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this.bits = BitArray.makeArray(size);
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}
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else {
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this.bits = bits;
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}
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}
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}
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getSize() {
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return this.size;
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}
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getSizeInBytes() {
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return Math.floor((this.size + 7) / 8);
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}
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ensureCapacity(size /*int*/) {
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if (size > this.bits.length * 32) {
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const newBits = BitArray.makeArray(size);
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System.arraycopy(this.bits, 0, newBits, 0, this.bits.length);
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this.bits = newBits;
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}
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}
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/**
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* @param i bit to get
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* @return true iff bit i is set
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*/
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get(i /*int*/) {
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return (this.bits[Math.floor(i / 32)] & (1 << (i & 0x1F))) !== 0;
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}
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/**
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* Sets bit i.
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*
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* @param i bit to set
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*/
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set(i /*int*/) {
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this.bits[Math.floor(i / 32)] |= 1 << (i & 0x1F);
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}
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/**
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* Flips bit i.
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*
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* @param i bit to set
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*/
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flip(i /*int*/) {
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this.bits[Math.floor(i / 32)] ^= 1 << (i & 0x1F);
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}
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/**
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* @param from first bit to check
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* @return index of first bit that is set, starting from the given index, or size if none are set
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* at or beyond this given index
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* @see #getNextUnset(int)
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*/
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getNextSet(from /*int*/) {
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const size = this.size;
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if (from >= size) {
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return size;
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}
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const bits = this.bits;
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let bitsOffset = Math.floor(from / 32);
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let currentBits = bits[bitsOffset];
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// mask off lesser bits first
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currentBits &= ~((1 << (from & 0x1F)) - 1);
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const length = bits.length;
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while (currentBits === 0) {
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if (++bitsOffset === length) {
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return size;
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}
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currentBits = bits[bitsOffset];
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}
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const result = (bitsOffset * 32) + Integer.numberOfTrailingZeros(currentBits);
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return result > size ? size : result;
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}
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/**
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* @param from index to start looking for unset bit
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* @return index of next unset bit, or {@code size} if none are unset until the end
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* @see #getNextSet(int)
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*/
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getNextUnset(from /*int*/) {
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const size = this.size;
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if (from >= size) {
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return size;
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}
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const bits = this.bits;
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let bitsOffset = Math.floor(from / 32);
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let currentBits = ~bits[bitsOffset];
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// mask off lesser bits first
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currentBits &= ~((1 << (from & 0x1F)) - 1);
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const length = bits.length;
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while (currentBits === 0) {
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if (++bitsOffset === length) {
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return size;
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}
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currentBits = ~bits[bitsOffset];
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}
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const result = (bitsOffset * 32) + Integer.numberOfTrailingZeros(currentBits);
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return result > size ? size : result;
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}
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/**
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* Sets a block of 32 bits, starting at bit i.
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*
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* @param i first bit to set
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* @param newBits the new value of the next 32 bits. Note again that the least-significant bit
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* corresponds to bit i, the next-least-significant to i+1, and so on.
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*/
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setBulk(i /*int*/, newBits /*int*/) {
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this.bits[Math.floor(i / 32)] = newBits;
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}
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/**
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* Sets a range of bits.
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*
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* @param start start of range, inclusive.
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* @param end end of range, exclusive
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*/
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setRange(start /*int*/, end /*int*/) {
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if (end < start || start < 0 || end > this.size) {
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throw new IllegalArgumentException();
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}
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if (end === start) {
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return;
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}
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end--; // will be easier to treat this as the last actually set bit -- inclusive
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const firstInt = Math.floor(start / 32);
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const lastInt = Math.floor(end / 32);
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const bits = this.bits;
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for (let i = firstInt; i <= lastInt; i++) {
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const firstBit = i > firstInt ? 0 : start & 0x1F;
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const lastBit = i < lastInt ? 31 : end & 0x1F;
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// Ones from firstBit to lastBit, inclusive
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const mask = (2 << lastBit) - (1 << firstBit);
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bits[i] |= mask;
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}
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}
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/**
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* Clears all bits (sets to false).
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*/
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clear() {
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const max = this.bits.length;
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const bits = this.bits;
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for (let i = 0; i < max; i++) {
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bits[i] = 0;
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}
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}
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/**
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* Efficient method to check if a range of bits is set, or not set.
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*
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* @param start start of range, inclusive.
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* @param end end of range, exclusive
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* @param value if true, checks that bits in range are set, otherwise checks that they are not set
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* @return true iff all bits are set or not set in range, according to value argument
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* @throws IllegalArgumentException if end is less than start or the range is not contained in the array
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*/
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isRange(start /*int*/, end /*int*/, value) {
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if (end < start || start < 0 || end > this.size) {
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throw new IllegalArgumentException();
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}
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if (end === start) {
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return true; // empty range matches
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}
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end--; // will be easier to treat this as the last actually set bit -- inclusive
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const firstInt = Math.floor(start / 32);
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const lastInt = Math.floor(end / 32);
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const bits = this.bits;
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for (let i = firstInt; i <= lastInt; i++) {
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const firstBit = i > firstInt ? 0 : start & 0x1F;
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const lastBit = i < lastInt ? 31 : end & 0x1F;
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// Ones from firstBit to lastBit, inclusive
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const mask = (2 << lastBit) - (1 << firstBit) & 0xFFFFFFFF;
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// TYPESCRIPTPORT: & 0xFFFFFFFF added to discard anything after 32 bits, as ES has 53 bits
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// Return false if we're looking for 1s and the masked bits[i] isn't all 1s (is: that,
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// equals the mask, or we're looking for 0s and the masked portion is not all 0s
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if ((bits[i] & mask) !== (value ? mask : 0)) {
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return false;
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}
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}
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return true;
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}
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appendBit(bit) {
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this.ensureCapacity(this.size + 1);
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if (bit) {
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this.bits[Math.floor(this.size / 32)] |= 1 << (this.size & 0x1F);
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}
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this.size++;
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}
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/**
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* Appends the least-significant bits, from value, in order from most-significant to
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* least-significant. For example, appending 6 bits from 0x000001E will append the bits
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* 0, 1, 1, 1, 1, 0 in that order.
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*
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* @param value {@code int} containing bits to append
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* @param numBits bits from value to append
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*/
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appendBits(value /*int*/, numBits /*int*/) {
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if (numBits < 0 || numBits > 32) {
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throw new IllegalArgumentException('Num bits must be between 0 and 32');
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}
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this.ensureCapacity(this.size + numBits);
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// const appendBit = this.appendBit;
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for (let numBitsLeft = numBits; numBitsLeft > 0; numBitsLeft--) {
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this.appendBit(((value >> (numBitsLeft - 1)) & 0x01) === 1);
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}
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}
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appendBitArray(other) {
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const otherSize = other.size;
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this.ensureCapacity(this.size + otherSize);
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// const appendBit = this.appendBit;
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for (let i = 0; i < otherSize; i++) {
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this.appendBit(other.get(i));
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}
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}
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xor(other) {
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if (this.size !== other.size) {
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throw new IllegalArgumentException('Sizes don\'t match');
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}
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const bits = this.bits;
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for (let i = 0, length = bits.length; i < length; i++) {
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// The last int could be incomplete (i.e. not have 32 bits in
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// it) but there is no problem since 0 XOR 0 == 0.
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bits[i] ^= other.bits[i];
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}
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}
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/**
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*
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* @param bitOffset first bit to start writing
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* @param array array to write into. Bytes are written most-significant byte first. This is the opposite
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* of the internal representation, which is exposed by {@link #getBitArray()}
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* @param offset position in array to start writing
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* @param numBytes how many bytes to write
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*/
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toBytes(bitOffset /*int*/, array, offset /*int*/, numBytes /*int*/) {
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for (let i = 0; i < numBytes; i++) {
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let theByte = 0;
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for (let j = 0; j < 8; j++) {
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if (this.get(bitOffset)) {
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theByte |= 1 << (7 - j);
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}
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bitOffset++;
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}
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array[offset + i] = /*(byte)*/ theByte;
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}
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}
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/**
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* @return underlying array of ints. The first element holds the first 32 bits, and the least
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* significant bit is bit 0.
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*/
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getBitArray() {
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return this.bits;
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}
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/**
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* Reverses all bits in the array.
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*/
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reverse() {
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const newBits = new Int32Array(this.bits.length);
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// reverse all int's first
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const len = Math.floor((this.size - 1) / 32);
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const oldBitsLen = len + 1;
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const bits = this.bits;
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for (let i = 0; i < oldBitsLen; i++) {
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let x = bits[i];
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x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
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x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
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x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
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x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
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x = ((x >> 16) & 0x0000ffff) | ((x & 0x0000ffff) << 16);
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newBits[len - i] = /*(int)*/ x;
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}
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// now correct the int's if the bit size isn't a multiple of 32
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if (this.size !== oldBitsLen * 32) {
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const leftOffset = oldBitsLen * 32 - this.size;
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let currentInt = newBits[0] >>> leftOffset;
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for (let i = 1; i < oldBitsLen; i++) {
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const nextInt = newBits[i];
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currentInt |= nextInt << (32 - leftOffset);
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newBits[i - 1] = currentInt;
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currentInt = nextInt >>> leftOffset;
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}
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newBits[oldBitsLen - 1] = currentInt;
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}
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this.bits = newBits;
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}
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static makeArray(size /*int*/) {
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return new Int32Array(Math.floor((size + 31) / 32));
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}
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/*@Override*/
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equals(o) {
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if (!(o instanceof BitArray)) {
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return false;
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}
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const other = o;
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return this.size === other.size && Arrays.equals(this.bits, other.bits);
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}
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/*@Override*/
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hashCode() {
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return 31 * this.size + Arrays.hashCode(this.bits);
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}
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/*@Override*/
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toString() {
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let result = '';
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for (let i = 0, size = this.size; i < size; i++) {
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if ((i & 0x07) === 0) {
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result += ' ';
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}
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result += this.get(i) ? 'X' : '.';
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}
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return result;
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}
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/*@Override*/
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clone() {
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return new BitArray(this.size, this.bits.slice());
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}
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/**
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* converts to boolean array.
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*/
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toArray() {
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let result = [];
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for (let i = 0, size = this.size; i < size; i++) {
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result.push(this.get(i));
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}
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return result;
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}
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}
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