| 1 | /**
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| 2 | * @license
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| 3 | * Copyright Google LLC All Rights Reserved.
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| 4 | *
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| 5 | * Use of this source code is governed by an MIT-style license that can be
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| 6 | * found in the LICENSE file at https://angular.io/license
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| 7 | */
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| 8 | import { newArray, utf8Encode } from '../util';
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| 9 | import { BigIntExponentiation } from './big_integer';
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| 10 | /**
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| 11 | * Return the message id or compute it using the XLIFF1 digest.
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| 12 | */
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| 13 | export function digest(message) {
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| 14 | return message.id || computeDigest(message);
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| 15 | }
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| 16 | /**
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| 17 | * Compute the message id using the XLIFF1 digest.
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| 18 | */
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| 19 | export function computeDigest(message) {
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| 20 | return sha1(serializeNodes(message.nodes).join('') + `[${message.meaning}]`);
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| 21 | }
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| 22 | /**
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| 23 | * Return the message id or compute it using the XLIFF2/XMB/$localize digest.
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| 24 | */
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| 25 | export function decimalDigest(message) {
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| 26 | return message.id || computeDecimalDigest(message);
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| 27 | }
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| 28 | /**
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| 29 | * Compute the message id using the XLIFF2/XMB/$localize digest.
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| 30 | */
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| 31 | export function computeDecimalDigest(message) {
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| 32 | const visitor = new _SerializerIgnoreIcuExpVisitor();
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| 33 | const parts = message.nodes.map(a => a.visit(visitor, null));
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| 34 | return computeMsgId(parts.join(''), message.meaning);
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| 35 | }
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| 36 | /**
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| 37 | * Serialize the i18n ast to something xml-like in order to generate an UID.
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| 38 | *
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| 39 | * The visitor is also used in the i18n parser tests
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| 40 | *
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| 41 | * @internal
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| 42 | */
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| 43 | class _SerializerVisitor {
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| 44 | visitText(text, context) {
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| 45 | return text.value;
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| 46 | }
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| 47 | visitContainer(container, context) {
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| 48 | return `[${container.children.map(child => child.visit(this)).join(', ')}]`;
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| 49 | }
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| 50 | visitIcu(icu, context) {
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| 51 | const strCases = Object.keys(icu.cases).map((k) => `${k} {${icu.cases[k].visit(this)}}`);
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| 52 | return `{${icu.expression}, ${icu.type}, ${strCases.join(', ')}}`;
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| 53 | }
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| 54 | visitTagPlaceholder(ph, context) {
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| 55 | return ph.isVoid ?
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| 56 | `<ph tag name="${ph.startName}"/>` :
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| 57 | `<ph tag name="${ph.startName}">${ph.children.map(child => child.visit(this)).join(', ')}</ph name="${ph.closeName}">`;
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| 58 | }
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| 59 | visitPlaceholder(ph, context) {
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| 60 | return ph.value ? `<ph name="${ph.name}">${ph.value}</ph>` : `<ph name="${ph.name}"/>`;
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| 61 | }
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| 62 | visitIcuPlaceholder(ph, context) {
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| 63 | return `<ph icu name="${ph.name}">${ph.value.visit(this)}</ph>`;
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| 64 | }
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| 65 | }
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| 66 | const serializerVisitor = new _SerializerVisitor();
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| 67 | export function serializeNodes(nodes) {
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| 68 | return nodes.map(a => a.visit(serializerVisitor, null));
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| 69 | }
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| 70 | /**
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| 71 | * Serialize the i18n ast to something xml-like in order to generate an UID.
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| 72 | *
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| 73 | * Ignore the ICU expressions so that message IDs stays identical if only the expression changes.
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| 74 | *
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| 75 | * @internal
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| 76 | */
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| 77 | class _SerializerIgnoreIcuExpVisitor extends _SerializerVisitor {
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| 78 | visitIcu(icu, context) {
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| 79 | let strCases = Object.keys(icu.cases).map((k) => `${k} {${icu.cases[k].visit(this)}}`);
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| 80 | // Do not take the expression into account
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| 81 | return `{${icu.type}, ${strCases.join(', ')}}`;
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| 82 | }
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| 83 | }
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| 84 | /**
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| 85 | * Compute the SHA1 of the given string
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| 86 | *
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| 87 | * see https://csrc.nist.gov/publications/fips/fips180-4/fips-180-4.pdf
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| 88 | *
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| 89 | * WARNING: this function has not been designed not tested with security in mind.
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| 90 | * DO NOT USE IT IN A SECURITY SENSITIVE CONTEXT.
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| 91 | */
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| 92 | export function sha1(str) {
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| 93 | const utf8 = utf8Encode(str);
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| 94 | const words32 = bytesToWords32(utf8, Endian.Big);
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| 95 | const len = utf8.length * 8;
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| 96 | const w = newArray(80);
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| 97 | let a = 0x67452301, b = 0xefcdab89, c = 0x98badcfe, d = 0x10325476, e = 0xc3d2e1f0;
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| 98 | words32[len >> 5] |= 0x80 << (24 - len % 32);
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| 99 | words32[((len + 64 >> 9) << 4) + 15] = len;
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| 100 | for (let i = 0; i < words32.length; i += 16) {
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| 101 | const h0 = a, h1 = b, h2 = c, h3 = d, h4 = e;
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| 102 | for (let j = 0; j < 80; j++) {
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| 103 | if (j < 16) {
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| 104 | w[j] = words32[i + j];
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| 105 | }
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| 106 | else {
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| 107 | w[j] = rol32(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1);
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| 108 | }
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| 109 | const fkVal = fk(j, b, c, d);
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| 110 | const f = fkVal[0];
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| 111 | const k = fkVal[1];
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| 112 | const temp = [rol32(a, 5), f, e, k, w[j]].reduce(add32);
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| 113 | e = d;
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| 114 | d = c;
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| 115 | c = rol32(b, 30);
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| 116 | b = a;
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| 117 | a = temp;
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| 118 | }
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| 119 | a = add32(a, h0);
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| 120 | b = add32(b, h1);
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| 121 | c = add32(c, h2);
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| 122 | d = add32(d, h3);
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| 123 | e = add32(e, h4);
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| 124 | }
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| 125 | return bytesToHexString(words32ToByteString([a, b, c, d, e]));
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| 126 | }
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| 127 | function fk(index, b, c, d) {
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| 128 | if (index < 20) {
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| 129 | return [(b & c) | (~b & d), 0x5a827999];
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| 130 | }
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| 131 | if (index < 40) {
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| 132 | return [b ^ c ^ d, 0x6ed9eba1];
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| 133 | }
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| 134 | if (index < 60) {
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| 135 | return [(b & c) | (b & d) | (c & d), 0x8f1bbcdc];
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| 136 | }
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| 137 | return [b ^ c ^ d, 0xca62c1d6];
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| 138 | }
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| 139 | /**
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| 140 | * Compute the fingerprint of the given string
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| 141 | *
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| 142 | * The output is 64 bit number encoded as a decimal string
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| 143 | *
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| 144 | * based on:
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| 145 | * https://github.com/google/closure-compiler/blob/master/src/com/google/javascript/jscomp/GoogleJsMessageIdGenerator.java
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| 146 | */
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| 147 | export function fingerprint(str) {
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| 148 | const utf8 = utf8Encode(str);
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| 149 | let hi = hash32(utf8, 0);
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| 150 | let lo = hash32(utf8, 102072);
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| 151 | if (hi == 0 && (lo == 0 || lo == 1)) {
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| 152 | hi = hi ^ 0x130f9bef;
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| 153 | lo = lo ^ -0x6b5f56d8;
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| 154 | }
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| 155 | return [hi, lo];
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| 156 | }
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| 157 | export function computeMsgId(msg, meaning = '') {
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| 158 | let msgFingerprint = fingerprint(msg);
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| 159 | if (meaning) {
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| 160 | const meaningFingerprint = fingerprint(meaning);
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| 161 | msgFingerprint = add64(rol64(msgFingerprint, 1), meaningFingerprint);
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| 162 | }
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| 163 | const hi = msgFingerprint[0];
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| 164 | const lo = msgFingerprint[1];
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| 165 | return wordsToDecimalString(hi & 0x7fffffff, lo);
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| 166 | }
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| 167 | function hash32(bytes, c) {
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| 168 | let a = 0x9e3779b9, b = 0x9e3779b9;
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| 169 | let i;
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| 170 | const len = bytes.length;
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| 171 | for (i = 0; i + 12 <= len; i += 12) {
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| 172 | a = add32(a, wordAt(bytes, i, Endian.Little));
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| 173 | b = add32(b, wordAt(bytes, i + 4, Endian.Little));
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| 174 | c = add32(c, wordAt(bytes, i + 8, Endian.Little));
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| 175 | const res = mix(a, b, c);
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| 176 | a = res[0], b = res[1], c = res[2];
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| 177 | }
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| 178 | a = add32(a, wordAt(bytes, i, Endian.Little));
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| 179 | b = add32(b, wordAt(bytes, i + 4, Endian.Little));
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| 180 | // the first byte of c is reserved for the length
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| 181 | c = add32(c, len);
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| 182 | c = add32(c, wordAt(bytes, i + 8, Endian.Little) << 8);
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| 183 | return mix(a, b, c)[2];
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| 184 | }
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| 185 | // clang-format off
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| 186 | function mix(a, b, c) {
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| 187 | a = sub32(a, b);
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| 188 | a = sub32(a, c);
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| 189 | a ^= c >>> 13;
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| 190 | b = sub32(b, c);
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| 191 | b = sub32(b, a);
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| 192 | b ^= a << 8;
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| 193 | c = sub32(c, a);
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| 194 | c = sub32(c, b);
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| 195 | c ^= b >>> 13;
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| 196 | a = sub32(a, b);
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| 197 | a = sub32(a, c);
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| 198 | a ^= c >>> 12;
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| 199 | b = sub32(b, c);
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| 200 | b = sub32(b, a);
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| 201 | b ^= a << 16;
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| 202 | c = sub32(c, a);
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| 203 | c = sub32(c, b);
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| 204 | c ^= b >>> 5;
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| 205 | a = sub32(a, b);
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| 206 | a = sub32(a, c);
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| 207 | a ^= c >>> 3;
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| 208 | b = sub32(b, c);
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| 209 | b = sub32(b, a);
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| 210 | b ^= a << 10;
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| 211 | c = sub32(c, a);
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| 212 | c = sub32(c, b);
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| 213 | c ^= b >>> 15;
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| 214 | return [a, b, c];
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| 215 | }
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| 216 | // clang-format on
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| 217 | // Utils
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| 218 | var Endian;
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| 219 | (function (Endian) {
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| 220 | Endian[Endian["Little"] = 0] = "Little";
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| 221 | Endian[Endian["Big"] = 1] = "Big";
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| 222 | })(Endian || (Endian = {}));
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| 223 | function add32(a, b) {
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| 224 | return add32to64(a, b)[1];
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| 225 | }
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| 226 | function add32to64(a, b) {
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| 227 | const low = (a & 0xffff) + (b & 0xffff);
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| 228 | const high = (a >>> 16) + (b >>> 16) + (low >>> 16);
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| 229 | return [high >>> 16, (high << 16) | (low & 0xffff)];
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| 230 | }
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| 231 | function add64(a, b) {
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| 232 | const ah = a[0], al = a[1];
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| 233 | const bh = b[0], bl = b[1];
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| 234 | const result = add32to64(al, bl);
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| 235 | const carry = result[0];
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| 236 | const l = result[1];
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| 237 | const h = add32(add32(ah, bh), carry);
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| 238 | return [h, l];
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| 239 | }
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| 240 | function sub32(a, b) {
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| 241 | const low = (a & 0xffff) - (b & 0xffff);
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| 242 | const high = (a >> 16) - (b >> 16) + (low >> 16);
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| 243 | return (high << 16) | (low & 0xffff);
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| 244 | }
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| 245 | // Rotate a 32b number left `count` position
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| 246 | function rol32(a, count) {
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| 247 | return (a << count) | (a >>> (32 - count));
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| 248 | }
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| 249 | // Rotate a 64b number left `count` position
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| 250 | function rol64(num, count) {
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| 251 | const hi = num[0], lo = num[1];
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| 252 | const h = (hi << count) | (lo >>> (32 - count));
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| 253 | const l = (lo << count) | (hi >>> (32 - count));
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| 254 | return [h, l];
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| 255 | }
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| 256 | function bytesToWords32(bytes, endian) {
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| 257 | const size = (bytes.length + 3) >>> 2;
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| 258 | const words32 = [];
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| 259 | for (let i = 0; i < size; i++) {
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| 260 | words32[i] = wordAt(bytes, i * 4, endian);
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| 261 | }
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| 262 | return words32;
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| 263 | }
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| 264 | function byteAt(bytes, index) {
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| 265 | return index >= bytes.length ? 0 : bytes[index];
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| 266 | }
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| 267 | function wordAt(bytes, index, endian) {
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| 268 | let word = 0;
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| 269 | if (endian === Endian.Big) {
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| 270 | for (let i = 0; i < 4; i++) {
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| 271 | word += byteAt(bytes, index + i) << (24 - 8 * i);
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| 272 | }
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| 273 | }
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| 274 | else {
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| 275 | for (let i = 0; i < 4; i++) {
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| 276 | word += byteAt(bytes, index + i) << 8 * i;
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| 277 | }
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| 278 | }
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| 279 | return word;
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| 280 | }
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| 281 | function words32ToByteString(words32) {
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| 282 | return words32.reduce((bytes, word) => bytes.concat(word32ToByteString(word)), []);
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| 283 | }
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| 284 | function word32ToByteString(word) {
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| 285 | let bytes = [];
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| 286 | for (let i = 0; i < 4; i++) {
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| 287 | bytes.push((word >>> 8 * (3 - i)) & 0xff);
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| 288 | }
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| 289 | return bytes;
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| 290 | }
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| 291 | function bytesToHexString(bytes) {
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| 292 | let hex = '';
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| 293 | for (let i = 0; i < bytes.length; i++) {
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| 294 | const b = byteAt(bytes, i);
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| 295 | hex += (b >>> 4).toString(16) + (b & 0x0f).toString(16);
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| 296 | }
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| 297 | return hex.toLowerCase();
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| 298 | }
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| 299 | /**
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| 300 | * Create a shared exponentiation pool for base-256 computations. This shared pool provides memoized
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| 301 | * power-of-256 results with memoized power-of-two computations for efficient multiplication.
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| 302 | *
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| 303 | * For our purposes, this can be safely stored as a global without memory concerns. The reason is
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| 304 | * that we encode two words, so only need the 0th (for the low word) and 4th (for the high word)
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| 305 | * exponent.
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| 306 | */
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| 307 | const base256 = new BigIntExponentiation(256);
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| 308 | /**
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| 309 | * Represents two 32-bit words as a single decimal number. This requires a big integer storage
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| 310 | * model as JS numbers are not accurate enough to represent the 64-bit number.
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| 311 | *
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| 312 | * Based on https://www.danvk.org/hex2dec.html
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| 313 | */
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| 314 | function wordsToDecimalString(hi, lo) {
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| 315 | // Encode the four bytes in lo in the lower digits of the decimal number.
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| 316 | // Note: the multiplication results in lo itself but represented by a big integer using its
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| 317 | // decimal digits.
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| 318 | const decimal = base256.toThePowerOf(0).multiplyBy(lo);
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| 319 | // Encode the four bytes in hi above the four lo bytes. lo is a maximum of (2^8)^4, which is why
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| 320 | // this multiplication factor is applied.
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| 321 | base256.toThePowerOf(4).multiplyByAndAddTo(hi, decimal);
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| 322 | return decimal.toString();
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| 323 | }
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| 324 | //# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Byte, newArray, utf8Encode} from '../util';\nimport {BigIntExponentiation} from './big_integer';\n\nimport * as i18n from './i18n_ast';\n\n/**\n * Return the message id or compute it using the XLIFF1 digest.\n */\nexport function digest(message: i18n.Message): string {\n  return message.id || computeDigest(message);\n}\n\n/**\n * Compute the message id using the XLIFF1 digest.\n */\nexport function computeDigest(message: i18n.Message): string {\n  return sha1(serializeNodes(message.nodes).join('') + `[${message.meaning}]`);\n}\n\n/**\n * Return the message id or compute it using the XLIFF2/XMB/$localize digest.\n */\nexport function decimalDigest(message: i18n.Message): string {\n  return message.id || computeDecimalDigest(message);\n}\n\n/**\n * Compute the message id using the XLIFF2/XMB/$localize digest.\n */\nexport function computeDecimalDigest(message: i18n.Message): string {\n  const visitor = new _SerializerIgnoreIcuExpVisitor();\n  const parts = message.nodes.map(a => a.visit(visitor, null));\n  return computeMsgId(parts.join(''), message.meaning);\n}\n\n/**\n * Serialize the i18n ast to something xml-like in order to generate an UID.\n *\n * The visitor is also used in the i18n parser tests\n *\n * @internal\n */\nclass _SerializerVisitor implements i18n.Visitor {\n  visitText(text: i18n.Text, context: any): any {\n    return text.value;\n  }\n\n  visitContainer(container: i18n.Container, context: any): any {\n    return `[${container.children.map(child => child.visit(this)).join(', ')}]`;\n  }\n\n  visitIcu(icu: i18n.Icu, context: any): any {\n    const strCases =\n        Object.keys(icu.cases).map((k: string) => `${k} {${icu.cases[k].visit(this)}}`);\n    return `{${icu.expression}, ${icu.type}, ${strCases.join(', ')}}`;\n  }\n\n  visitTagPlaceholder(ph: i18n.TagPlaceholder, context: any): any {\n    return ph.isVoid ?\n        `<ph tag name=\"${ph.startName}\"/>` :\n        `<ph tag name=\"${ph.startName}\">${\n            ph.children.map(child => child.visit(this)).join(', ')}</ph name=\"${ph.closeName}\">`;\n  }\n\n  visitPlaceholder(ph: i18n.Placeholder, context: any): any {\n    return ph.value ? `<ph name=\"${ph.name}\">${ph.value}</ph>` : `<ph name=\"${ph.name}\"/>`;\n  }\n\n  visitIcuPlaceholder(ph: i18n.IcuPlaceholder, context?: any): any {\n    return `<ph icu name=\"${ph.name}\">${ph.value.visit(this)}</ph>`;\n  }\n}\n\nconst serializerVisitor = new _SerializerVisitor();\n\nexport function serializeNodes(nodes: i18n.Node[]): string[] {\n  return nodes.map(a => a.visit(serializerVisitor, null));\n}\n\n/**\n * Serialize the i18n ast to something xml-like in order to generate an UID.\n *\n * Ignore the ICU expressions so that message IDs stays identical if only the expression changes.\n *\n * @internal\n */\nclass _SerializerIgnoreIcuExpVisitor extends _SerializerVisitor {\n  override visitIcu(icu: i18n.Icu, context: any): any {\n    let strCases = Object.keys(icu.cases).map((k: string) => `${k} {${icu.cases[k].visit(this)}}`);\n    // Do not take the expression into account\n    return `{${icu.type}, ${strCases.join(', ')}}`;\n  }\n}\n\n/**\n * Compute the SHA1 of the given string\n *\n * see https://csrc.nist.gov/publications/fips/fips180-4/fips-180-4.pdf\n *\n * WARNING: this function has not been designed not tested with security in mind.\n *          DO NOT USE IT IN A SECURITY SENSITIVE CONTEXT.\n */\nexport function sha1(str: string): string {\n  const utf8 = utf8Encode(str);\n  const words32 = bytesToWords32(utf8, Endian.Big);\n  const len = utf8.length * 8;\n\n  const w = newArray(80);\n  let a = 0x67452301, b = 0xefcdab89, c = 0x98badcfe, d = 0x10325476, e = 0xc3d2e1f0;\n\n  words32[len >> 5] |= 0x80 << (24 - len % 32);\n  words32[((len + 64 >> 9) << 4) + 15] = len;\n\n  for (let i = 0; i < words32.length; i += 16) {\n    const h0 = a, h1 = b, h2 = c, h3 = d, h4 = e;\n\n    for (let j = 0; j < 80; j++) {\n      if (j < 16) {\n        w[j] = words32[i + j];\n      } else {\n        w[j] = rol32(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1);\n      }\n\n      const fkVal = fk(j, b, c, d);\n      const f = fkVal[0];\n      const k = fkVal[1];\n      const temp = [rol32(a, 5), f, e, k, w[j]].reduce(add32);\n      e = d;\n      d = c;\n      c = rol32(b, 30);\n      b = a;\n      a = temp;\n    }\n    a = add32(a, h0);\n    b = add32(b, h1);\n    c = add32(c, h2);\n    d = add32(d, h3);\n    e = add32(e, h4);\n  }\n\n  return bytesToHexString(words32ToByteString([a, b, c, d, e]));\n}\n\nfunction fk(index: number, b: number, c: number, d: number): [number, number] {\n  if (index < 20) {\n    return [(b & c) | (~b & d), 0x5a827999];\n  }\n\n  if (index < 40) {\n    return [b ^ c ^ d, 0x6ed9eba1];\n  }\n\n  if (index < 60) {\n    return [(b & c) | (b & d) | (c & d), 0x8f1bbcdc];\n  }\n\n  return [b ^ c ^ d, 0xca62c1d6];\n}\n\n/**\n * Compute the fingerprint of the given string\n *\n * The output is 64 bit number encoded as a decimal string\n *\n * based on:\n * https://github.com/google/closure-compiler/blob/master/src/com/google/javascript/jscomp/GoogleJsMessageIdGenerator.java\n */\nexport function fingerprint(str: string): [number, number] {\n  const utf8 = utf8Encode(str);\n\n  let hi = hash32(utf8, 0);\n  let lo = hash32(utf8, 102072);\n\n  if (hi == 0 && (lo == 0 || lo == 1)) {\n    hi = hi ^ 0x130f9bef;\n    lo = lo ^ -0x6b5f56d8;\n  }\n\n  return [hi, lo];\n}\n\nexport function computeMsgId(msg: string, meaning: string = ''): string {\n  let msgFingerprint = fingerprint(msg);\n\n  if (meaning) {\n    const meaningFingerprint = fingerprint(meaning);\n    msgFingerprint = add64(rol64(msgFingerprint, 1), meaningFingerprint);\n  }\n\n  const hi = msgFingerprint[0];\n  const lo = msgFingerprint[1];\n\n  return wordsToDecimalString(hi & 0x7fffffff, lo);\n}\n\nfunction hash32(bytes: Byte[], c: number): number {\n  let a = 0x9e3779b9, b = 0x9e3779b9;\n  let i: number;\n\n  const len = bytes.length;\n\n  for (i = 0; i + 12 <= len; i += 12) {\n    a = add32(a, wordAt(bytes, i, Endian.Little));\n    b = add32(b, wordAt(bytes, i + 4, Endian.Little));\n    c = add32(c, wordAt(bytes, i + 8, Endian.Little));\n    const res = mix(a, b, c);\n    a = res[0], b = res[1], c = res[2];\n  }\n\n  a = add32(a, wordAt(bytes, i, Endian.Little));\n  b = add32(b, wordAt(bytes, i + 4, Endian.Little));\n  // the first byte of c is reserved for the length\n  c = add32(c, len);\n  c = add32(c, wordAt(bytes, i + 8, Endian.Little) << 8);\n\n  return mix(a, b, c)[2];\n}\n\n// clang-format off\nfunction mix(a: number, b: number, c: number): [number, number, number] {\n  a = sub32(a, b); a = sub32(a, c); a ^= c >>> 13;\n  b = sub32(b, c); b = sub32(b, a); b ^= a << 8;\n  c = sub32(c, a); c = sub32(c, b); c ^= b >>> 13;\n  a = sub32(a, b); a = sub32(a, c); a ^= c >>> 12;\n  b = sub32(b, c); b = sub32(b, a); b ^= a << 16;\n  c = sub32(c, a); c = sub32(c, b); c ^= b >>> 5;\n  a = sub32(a, b); a = sub32(a, c); a ^= c >>> 3;\n  b = sub32(b, c); b = sub32(b, a); b ^= a << 10;\n  c = sub32(c, a); c = sub32(c, b); c ^= b >>> 15;\n  return [a, b, c];\n}\n// clang-format on\n\n// Utils\n\nenum Endian {\n  Little,\n  Big,\n}\n\nfunction add32(a: number, b: number): number {\n  return add32to64(a, b)[1];\n}\n\nfunction add32to64(a: number, b: number): [number, number] {\n  const low = (a & 0xffff) + (b & 0xffff);\n  const high = (a >>> 16) + (b >>> 16) + (low >>> 16);\n  return [high >>> 16, (high << 16) | (low & 0xffff)];\n}\n\nfunction add64(a: [number, number], b: [number, number]): [number, number] {\n  const ah = a[0], al = a[1];\n  const bh = b[0], bl = b[1];\n  const result = add32to64(al, bl);\n  const carry = result[0];\n  const l = result[1];\n  const h = add32(add32(ah, bh), carry);\n  return [h, l];\n}\n\nfunction sub32(a: number, b: number): number {\n  const low = (a & 0xffff) - (b & 0xffff);\n  const high = (a >> 16) - (b >> 16) + (low >> 16);\n  return (high << 16) | (low & 0xffff);\n}\n\n// Rotate a 32b number left `count` position\nfunction rol32(a: number, count: number): number {\n  return (a << count) | (a >>> (32 - count));\n}\n\n// Rotate a 64b number left `count` position\nfunction rol64(num: [number, number], count: number): [number, number] {\n  const hi = num[0], lo = num[1];\n  const h = (hi << count) | (lo >>> (32 - count));\n  const l = (lo << count) | (hi >>> (32 - count));\n  return [h, l];\n}\n\nfunction bytesToWords32(bytes: Byte[], endian: Endian): number[] {\n  const size = (bytes.length + 3) >>> 2;\n  const words32 = [];\n\n  for (let i = 0; i < size; i++) {\n    words32[i] = wordAt(bytes, i * 4, endian);\n  }\n\n  return words32;\n}\n\nfunction byteAt(bytes: Byte[], index: number): Byte {\n  return index >= bytes.length ? 0 : bytes[index];\n}\n\nfunction wordAt(bytes: Byte[], index: number, endian: Endian): number {\n  let word = 0;\n  if (endian === Endian.Big) {\n    for (let i = 0; i < 4; i++) {\n      word += byteAt(bytes, index + i) << (24 - 8 * i);\n    }\n  } else {\n    for (let i = 0; i < 4; i++) {\n      word += byteAt(bytes, index + i) << 8 * i;\n    }\n  }\n  return word;\n}\n\nfunction words32ToByteString(words32: number[]): Byte[] {\n  return words32.reduce((bytes, word) => bytes.concat(word32ToByteString(word)), [] as Byte[]);\n}\n\nfunction word32ToByteString(word: number): Byte[] {\n  let bytes: Byte[] = [];\n  for (let i = 0; i < 4; i++) {\n    bytes.push((word >>> 8 * (3 - i)) & 0xff);\n  }\n  return bytes;\n}\n\nfunction bytesToHexString(bytes: Byte[]): string {\n  let hex: string = '';\n  for (let i = 0; i < bytes.length; i++) {\n    const b = byteAt(bytes, i);\n    hex += (b >>> 4).toString(16) + (b & 0x0f).toString(16);\n  }\n  return hex.toLowerCase();\n}\n\n/**\n * Create a shared exponentiation pool for base-256 computations. This shared pool provides memoized\n * power-of-256 results with memoized power-of-two computations for efficient multiplication.\n *\n * For our purposes, this can be safely stored as a global without memory concerns. The reason is\n * that we encode two words, so only need the 0th (for the low word) and 4th (for the high word)\n * exponent.\n */\nconst base256 = new BigIntExponentiation(256);\n\n/**\n * Represents two 32-bit words as a single decimal number. This requires a big integer storage\n * model as JS numbers are not accurate enough to represent the 64-bit number.\n *\n * Based on https://www.danvk.org/hex2dec.html\n */\nfunction wordsToDecimalString(hi: number, lo: number): string {\n  // Encode the four bytes in lo in the lower digits of the decimal number.\n  // Note: the multiplication results in lo itself but represented by a big integer using its\n  // decimal digits.\n  const decimal = base256.toThePowerOf(0).multiplyBy(lo);\n\n  // Encode the four bytes in hi above the four lo bytes. lo is a maximum of (2^8)^4, which is why\n  // this multiplication factor is applied.\n  base256.toThePowerOf(4).multiplyByAndAddTo(hi, decimal);\n\n  return decimal.toString();\n}\n"]} |
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