mirror of
https://github.com/gorhill/uBlock.git
synced 2024-09-29 14:17:11 +02:00
a559f5f271
This create a separate Chromium extension, named
"uBO Minus (MV3)".
This experimental mv3 version supports only the blocking of
network requests through the declarativeNetRequest API, so as
to abide by the stated MV3 philosophy of not requiring broad
"read/modify data" permission. Accordingly, the extension
should not trigger the warning at installation time:
Read and change all your data on all websites
The consequences of being permission-less are the following:
- No cosmetic filtering (##)
- No scriptlet injection (##+js)
- No redirect= filters
- No csp= filters
- No removeparam= filters
At this point there is no popup panel or options pages.
The default filterset correspond to the default filterset of
uBO proper:
Listset for 'default':
https://ublockorigin.github.io/uAssets/filters/badware.txt
https://ublockorigin.github.io/uAssets/filters/filters.txt
https://ublockorigin.github.io/uAssets/filters/filters-2020.txt
https://ublockorigin.github.io/uAssets/filters/filters-2021.txt
https://ublockorigin.github.io/uAssets/filters/filters-2022.txt
https://ublockorigin.github.io/uAssets/filters/privacy.txt
https://ublockorigin.github.io/uAssets/filters/quick-fixes.txt
https://ublockorigin.github.io/uAssets/filters/resource-abuse.txt
https://ublockorigin.github.io/uAssets/filters/unbreak.txt
https://easylist.to/easylist/easylist.txt
https://easylist.to/easylist/easyprivacy.txt
https://malware-filter.gitlab.io/malware-filter/urlhaus-filter-online.txt
https://pgl.yoyo.org/adservers/serverlist.php?hostformat=hosts&showintro=1&mimetype=plaintext
The result of the conversion of the filters in all these
filter lists is as follow:
Ruleset size for 'default': 22245
Good: 21408
Maybe good (regexes): 127
redirect-rule= (discarded): 458
csp= (discarded): 85
removeparams= (discarded): 22
Unsupported: 145
The fact that the number of DNR rules are far lower than the
number of network filters reported in uBO comes from the fact
that lists-to-rulesets converter does its best to coallesce
filters into minimal set of rules. Notably, the DNR's
requestDomains condition property allows to create a single
DNR rule out of all pure hostname-based filters.
Regex-based rules are dynamically added at launch time since
they must be validated as valid DNR regexes through
isRegexSupported() API call.
At this point I consider being permission-less the limiting
factor: if broad "read/modify data" permission is to be used,
than there is not much point for an MV3 version over MV2, just
use the MV2 version if you want to benefit all the features
which can't be implemented without broad "read/modify data"
permission.
To locally build the MV3 extension:
make mv3
Then load the resulting extension directory in the browser
using the "Load unpacked" button.
From now on there will be a uBlock0.mv3.zip package available
in each release.
948 lines
34 KiB
JavaScript
948 lines
34 KiB
JavaScript
/*******************************************************************************
|
|
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uBlock Origin - a browser extension to block requests.
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Copyright (C) 2019-present Raymond Hill
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see {http://www.gnu.org/licenses/}.
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Home: https://github.com/gorhill/uBlock
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*/
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/* globals WebAssembly, vAPI */
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'use strict';
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/*******************************************************************************
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A BidiTrieContainer is mostly a large buffer in which distinct but related
|
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tries are stored. The memory layout of the buffer is as follow:
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0-2047: haystack section
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2048-2051: number of significant characters in the haystack
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2052-2055: offset to start of trie data section (=> trie0)
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|
2056-2059: offset to end of trie data section (=> trie1)
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|
2060-2063: offset to start of character data section (=> char0)
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|
2064-2067: offset to end of character data section (=> char1)
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2068: start of trie data section
|
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|
|
+--------------+
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Normal cell: | And | If "Segment info" matches:
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(aka CELL) +--------------+ Goto "And"
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| Or | Else
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+--------------+ Goto "Or"
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| Segment info |
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+--------------+
|
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|
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+--------------+
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Boundary cell: | Right And | "Right And" and/or "Left And"
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(aka BCELL) +--------------+ can be 0 in last-segment condition.
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| Left And |
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+--------------+
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| 0 |
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+--------------+
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Given following filters and assuming token is "ad" for all of them:
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-images/ad-
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/google_ad.
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/images_ad.
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_images/ad.
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|
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We get the following internal representation:
|
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|
|
+-----------+ +-----------+ +---+
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| |---->| |---->| 0 |
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+-----------+ +-----------+ +---+ +-----------+
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| 0 | +--| | | |---->| 0 |
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+-----------+ | +-----------+ +---+ +-----------+
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| ad | | | - | | 0 | | 0 |
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+-----------+ | +-----------+ +---+ +-----------+
|
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| | -images/ |
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| +-----------+ +---+ +-----------+
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+->| |---->| 0 |
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+-----------+ +---+ +-----------+ +-----------+
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| 0 | | |---->| |---->| 0 |
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+-----------+ +---+ +-----------+ +-----------+
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| . | | 0 | +--| | +--| |
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+-----------+ +---+ | +-----------+ | +-----------+
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| | _ | | | /google |
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| +-----------+ | +-----------+
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| |
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| | +-----------+
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| +->| 0 |
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| +-----------+
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| | 0 |
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| +-----------+
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| | /images |
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| +-----------+
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|
|
|
| +-----------+
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+->| 0 |
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+-----------+
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| 0 |
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+-----------+
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| _images/ |
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|
+-----------+
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|
|
*/
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const PAGE_SIZE = 65536*2;
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const HAYSTACK_START = 0;
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const HAYSTACK_SIZE = 2048; // i32 / i8
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const HAYSTACK_SIZE_SLOT = HAYSTACK_SIZE >>> 2; // 512 / 2048
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const TRIE0_SLOT = HAYSTACK_SIZE_SLOT + 1; // 513 / 2052
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const TRIE1_SLOT = HAYSTACK_SIZE_SLOT + 2; // 514 / 2056
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|
const CHAR0_SLOT = HAYSTACK_SIZE_SLOT + 3; // 515 / 2060
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|
const CHAR1_SLOT = HAYSTACK_SIZE_SLOT + 4; // 516 / 2064
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|
const RESULT_L_SLOT = HAYSTACK_SIZE_SLOT + 5; // 517 / 2068
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|
const RESULT_R_SLOT = HAYSTACK_SIZE_SLOT + 6; // 518 / 2072
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|
const RESULT_IU_SLOT = HAYSTACK_SIZE_SLOT + 7; // 519 / 2076
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|
const TRIE0_START = HAYSTACK_SIZE_SLOT + 8 << 2; // 2080
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|
|
const CELL_BYTE_LENGTH = 12;
|
|
const MIN_FREE_CELL_BYTE_LENGTH = CELL_BYTE_LENGTH * 8;
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|
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const CELL_AND = 0;
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|
const CELL_OR = 1;
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const SEGMENT_INFO = 2;
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|
const BCELL_NEXT_AND = 0;
|
|
const BCELL_ALT_AND = 1;
|
|
const BCELL_EXTRA = 2;
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|
const BCELL_EXTRA_MAX = 0x00FFFFFF;
|
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|
|
const toSegmentInfo = (aL, l, r) => ((r - l) << 24) | (aL + l);
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|
const roundToPageSize = v => (v + PAGE_SIZE-1) & ~(PAGE_SIZE-1);
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|
|
|
|
class BidiTrieContainer {
|
|
|
|
constructor(extraHandler) {
|
|
const len = PAGE_SIZE * 4;
|
|
this.buf8 = new Uint8Array(len);
|
|
this.buf32 = new Uint32Array(this.buf8.buffer);
|
|
this.buf32[TRIE0_SLOT] = TRIE0_START;
|
|
this.buf32[TRIE1_SLOT] = this.buf32[TRIE0_SLOT];
|
|
this.buf32[CHAR0_SLOT] = len >>> 1;
|
|
this.buf32[CHAR1_SLOT] = this.buf32[CHAR0_SLOT];
|
|
this.haystack = this.buf8.subarray(
|
|
HAYSTACK_START,
|
|
HAYSTACK_START + HAYSTACK_SIZE
|
|
);
|
|
this.extraHandler = extraHandler;
|
|
this.textDecoder = null;
|
|
this.wasmMemory = null;
|
|
|
|
this.lastStored = '';
|
|
this.lastStoredLen = this.lastStoredIndex = 0;
|
|
}
|
|
|
|
//--------------------------------------------------------------------------
|
|
// Public methods
|
|
//--------------------------------------------------------------------------
|
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|
|
get haystackLen() {
|
|
return this.buf32[HAYSTACK_SIZE_SLOT];
|
|
}
|
|
|
|
set haystackLen(v) {
|
|
this.buf32[HAYSTACK_SIZE_SLOT] = v;
|
|
}
|
|
|
|
reset(details) {
|
|
if (
|
|
details instanceof Object &&
|
|
typeof details.byteLength === 'number' &&
|
|
typeof details.char0 === 'number'
|
|
) {
|
|
if ( details.byteLength > this.buf8.byteLength ) {
|
|
this.reallocateBuf(details.byteLength);
|
|
}
|
|
this.buf32[CHAR0_SLOT] = details.char0;
|
|
}
|
|
this.buf32[TRIE1_SLOT] = this.buf32[TRIE0_SLOT];
|
|
this.buf32[CHAR1_SLOT] = this.buf32[CHAR0_SLOT];
|
|
|
|
this.lastStored = '';
|
|
this.lastStoredLen = this.lastStoredIndex = 0;
|
|
}
|
|
|
|
createTrie() {
|
|
// grow buffer if needed
|
|
if ( (this.buf32[CHAR0_SLOT] - this.buf32[TRIE1_SLOT]) < CELL_BYTE_LENGTH ) {
|
|
this.growBuf(CELL_BYTE_LENGTH, 0);
|
|
}
|
|
const iroot = this.buf32[TRIE1_SLOT] >>> 2;
|
|
this.buf32[TRIE1_SLOT] += CELL_BYTE_LENGTH;
|
|
this.buf32[iroot+CELL_OR] = 0;
|
|
this.buf32[iroot+CELL_AND] = 0;
|
|
this.buf32[iroot+SEGMENT_INFO] = 0;
|
|
return iroot;
|
|
}
|
|
|
|
matches(icell, ai) {
|
|
const buf32 = this.buf32;
|
|
const buf8 = this.buf8;
|
|
const char0 = buf32[CHAR0_SLOT];
|
|
const aR = buf32[HAYSTACK_SIZE_SLOT];
|
|
let al = ai, x = 0, y = 0;
|
|
for (;;) {
|
|
x = buf8[al];
|
|
al += 1;
|
|
// find matching segment
|
|
for (;;) {
|
|
y = buf32[icell+SEGMENT_INFO];
|
|
let bl = char0 + (y & 0x00FFFFFF);
|
|
if ( buf8[bl] === x ) {
|
|
y = (y >>> 24) - 1;
|
|
if ( y !== 0 ) {
|
|
x = al + y;
|
|
if ( x > aR ) { return 0; }
|
|
for (;;) {
|
|
bl += 1;
|
|
if ( buf8[bl] !== buf8[al] ) { return 0; }
|
|
al += 1;
|
|
if ( al === x ) { break; }
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
icell = buf32[icell+CELL_OR];
|
|
if ( icell === 0 ) { return 0; }
|
|
}
|
|
// next segment
|
|
icell = buf32[icell+CELL_AND];
|
|
x = buf32[icell+BCELL_EXTRA];
|
|
if ( x <= BCELL_EXTRA_MAX ) {
|
|
if ( x !== 0 && this.matchesExtra(ai, al, x) !== 0 ) {
|
|
return 1;
|
|
}
|
|
x = buf32[icell+BCELL_ALT_AND];
|
|
if ( x !== 0 && this.matchesLeft(x, ai, al) !== 0 ) {
|
|
return 1;
|
|
}
|
|
icell = buf32[icell+BCELL_NEXT_AND];
|
|
if ( icell === 0 ) { return 0; }
|
|
}
|
|
if ( al === aR ) { return 0; }
|
|
}
|
|
return 0; // eslint-disable-line no-unreachable
|
|
}
|
|
|
|
matchesLeft(icell, ar, r) {
|
|
const buf32 = this.buf32;
|
|
const buf8 = this.buf8;
|
|
const char0 = buf32[CHAR0_SLOT];
|
|
let x = 0, y = 0;
|
|
for (;;) {
|
|
if ( ar === 0 ) { return 0; }
|
|
ar -= 1;
|
|
x = buf8[ar];
|
|
// find first segment with a first-character match
|
|
for (;;) {
|
|
y = buf32[icell+SEGMENT_INFO];
|
|
let br = char0 + (y & 0x00FFFFFF);
|
|
y = (y >>> 24) - 1;
|
|
br += y;
|
|
if ( buf8[br] === x ) { // all characters in segment must match
|
|
if ( y !== 0 ) {
|
|
x = ar - y;
|
|
if ( x < 0 ) { return 0; }
|
|
for (;;) {
|
|
ar -= 1; br -= 1;
|
|
if ( buf8[ar] !== buf8[br] ) { return 0; }
|
|
if ( ar === x ) { break; }
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
icell = buf32[icell+CELL_OR];
|
|
if ( icell === 0 ) { return 0; }
|
|
}
|
|
// next segment
|
|
icell = buf32[icell+CELL_AND];
|
|
x = buf32[icell+BCELL_EXTRA];
|
|
if ( x <= BCELL_EXTRA_MAX ) {
|
|
if ( x !== 0 && this.matchesExtra(ar, r, x) !== 0 ) {
|
|
return 1;
|
|
}
|
|
icell = buf32[icell+BCELL_NEXT_AND];
|
|
if ( icell === 0 ) { return 0; }
|
|
}
|
|
}
|
|
return 0; // eslint-disable-line no-unreachable
|
|
}
|
|
|
|
matchesExtra(l, r, ix) {
|
|
let iu = 0;
|
|
if ( ix !== 1 ) {
|
|
iu = this.extraHandler(l, r, ix);
|
|
if ( iu === 0 ) { return 0; }
|
|
} else {
|
|
iu = -1;
|
|
}
|
|
this.buf32[RESULT_IU_SLOT] = iu;
|
|
this.buf32[RESULT_L_SLOT] = l;
|
|
this.buf32[RESULT_R_SLOT] = r;
|
|
return 1;
|
|
}
|
|
|
|
get $l() { return this.buf32[RESULT_L_SLOT] | 0; }
|
|
get $r() { return this.buf32[RESULT_R_SLOT] | 0; }
|
|
get $iu() { return this.buf32[RESULT_IU_SLOT] | 0; }
|
|
|
|
add(iroot, aL0, n, pivot = 0) {
|
|
const aR = n;
|
|
if ( aR === 0 ) { return 0; }
|
|
// Grow buffer if needed. The characters are already in our character
|
|
// data buffer, so we do not need to grow character data buffer.
|
|
if (
|
|
(this.buf32[CHAR0_SLOT] - this.buf32[TRIE1_SLOT]) <
|
|
MIN_FREE_CELL_BYTE_LENGTH
|
|
) {
|
|
this.growBuf(MIN_FREE_CELL_BYTE_LENGTH, 0);
|
|
}
|
|
const buf32 = this.buf32;
|
|
const char0 = buf32[CHAR0_SLOT];
|
|
let icell = iroot;
|
|
let aL = char0 + aL0;
|
|
// special case: first node in trie
|
|
if ( buf32[icell+SEGMENT_INFO] === 0 ) {
|
|
buf32[icell+SEGMENT_INFO] = toSegmentInfo(aL0, pivot, aR);
|
|
return this.addLeft(icell, aL0, pivot);
|
|
}
|
|
const buf8 = this.buf8;
|
|
let al = pivot;
|
|
let inext;
|
|
// find a matching cell: move down
|
|
for (;;) {
|
|
const binfo = buf32[icell+SEGMENT_INFO];
|
|
// length of segment
|
|
const bR = binfo >>> 24;
|
|
// skip boundary cells
|
|
if ( bR === 0 ) {
|
|
icell = buf32[icell+BCELL_NEXT_AND];
|
|
continue;
|
|
}
|
|
let bl = char0 + (binfo & 0x00FFFFFF);
|
|
// if first character is no match, move to next descendant
|
|
if ( buf8[bl] !== buf8[aL+al] ) {
|
|
inext = buf32[icell+CELL_OR];
|
|
if ( inext === 0 ) {
|
|
inext = this.addCell(0, 0, toSegmentInfo(aL0, al, aR));
|
|
buf32[icell+CELL_OR] = inext;
|
|
return this.addLeft(inext, aL0, pivot);
|
|
}
|
|
icell = inext;
|
|
continue;
|
|
}
|
|
// 1st character was tested
|
|
let bi = 1;
|
|
al += 1;
|
|
// find 1st mismatch in rest of segment
|
|
if ( bR !== 1 ) {
|
|
for (;;) {
|
|
if ( bi === bR ) { break; }
|
|
if ( al === aR ) { break; }
|
|
if ( buf8[bl+bi] !== buf8[aL+al] ) { break; }
|
|
bi += 1;
|
|
al += 1;
|
|
}
|
|
}
|
|
// all segment characters matched
|
|
if ( bi === bR ) {
|
|
// needle remainder: no
|
|
if ( al === aR ) {
|
|
return this.addLeft(icell, aL0, pivot);
|
|
}
|
|
// needle remainder: yes
|
|
inext = buf32[icell+CELL_AND];
|
|
if ( buf32[inext+CELL_AND] !== 0 ) {
|
|
icell = inext;
|
|
continue;
|
|
}
|
|
// add needle remainder
|
|
icell = this.addCell(0, 0, toSegmentInfo(aL0, al, aR));
|
|
buf32[inext+CELL_AND] = icell;
|
|
return this.addLeft(icell, aL0, pivot);
|
|
}
|
|
// some characters matched
|
|
// split current segment
|
|
bl -= char0;
|
|
buf32[icell+SEGMENT_INFO] = bi << 24 | bl;
|
|
inext = this.addCell(
|
|
buf32[icell+CELL_AND], 0, bR - bi << 24 | bl + bi
|
|
);
|
|
buf32[icell+CELL_AND] = inext;
|
|
// needle remainder: no = need boundary cell
|
|
if ( al === aR ) {
|
|
return this.addLeft(icell, aL0, pivot);
|
|
}
|
|
// needle remainder: yes = need new cell for remaining characters
|
|
icell = this.addCell(0, 0, toSegmentInfo(aL0, al, aR));
|
|
buf32[inext+CELL_OR] = icell;
|
|
return this.addLeft(icell, aL0, pivot);
|
|
}
|
|
}
|
|
|
|
addLeft(icell, aL0, pivot) {
|
|
const buf32 = this.buf32;
|
|
const char0 = buf32[CHAR0_SLOT];
|
|
let aL = aL0 + char0;
|
|
// fetch boundary cell
|
|
let iboundary = buf32[icell+CELL_AND];
|
|
// add boundary cell if none exist
|
|
if (
|
|
iboundary === 0 ||
|
|
buf32[iboundary+SEGMENT_INFO] > BCELL_EXTRA_MAX
|
|
) {
|
|
const inext = iboundary;
|
|
iboundary = this.allocateCell();
|
|
buf32[icell+CELL_AND] = iboundary;
|
|
buf32[iboundary+BCELL_NEXT_AND] = inext;
|
|
if ( pivot === 0 ) { return iboundary; }
|
|
}
|
|
// shortest match with no extra conditions will always win
|
|
if ( buf32[iboundary+BCELL_EXTRA] === 1 ) {
|
|
return iboundary;
|
|
}
|
|
// bail out if no left segment
|
|
if ( pivot === 0 ) { return iboundary; }
|
|
// fetch root cell of left segment
|
|
icell = buf32[iboundary+BCELL_ALT_AND];
|
|
if ( icell === 0 ) {
|
|
icell = this.allocateCell();
|
|
buf32[iboundary+BCELL_ALT_AND] = icell;
|
|
}
|
|
// special case: first node in trie
|
|
if ( buf32[icell+SEGMENT_INFO] === 0 ) {
|
|
buf32[icell+SEGMENT_INFO] = toSegmentInfo(aL0, 0, pivot);
|
|
iboundary = this.allocateCell();
|
|
buf32[icell+CELL_AND] = iboundary;
|
|
return iboundary;
|
|
}
|
|
const buf8 = this.buf8;
|
|
let ar = pivot, inext;
|
|
// find a matching cell: move down
|
|
for (;;) {
|
|
const binfo = buf32[icell+SEGMENT_INFO];
|
|
// skip boundary cells
|
|
if ( binfo <= BCELL_EXTRA_MAX ) {
|
|
inext = buf32[icell+CELL_AND];
|
|
if ( inext !== 0 ) {
|
|
icell = inext;
|
|
continue;
|
|
}
|
|
iboundary = this.allocateCell();
|
|
buf32[icell+CELL_AND] =
|
|
this.addCell(iboundary, 0, toSegmentInfo(aL0, 0, ar));
|
|
// TODO: boundary cell might be last
|
|
// add remainder + boundary cell
|
|
return iboundary;
|
|
}
|
|
const bL = char0 + (binfo & 0x00FFFFFF);
|
|
const bR = bL + (binfo >>> 24);
|
|
let br = bR;
|
|
// if first character is no match, move to next descendant
|
|
if ( buf8[br-1] !== buf8[aL+ar-1] ) {
|
|
inext = buf32[icell+CELL_OR];
|
|
if ( inext === 0 ) {
|
|
iboundary = this.allocateCell();
|
|
inext = this.addCell(
|
|
iboundary, 0, toSegmentInfo(aL0, 0, ar)
|
|
);
|
|
buf32[icell+CELL_OR] = inext;
|
|
return iboundary;
|
|
}
|
|
icell = inext;
|
|
continue;
|
|
}
|
|
// 1st character was tested
|
|
br -= 1;
|
|
ar -= 1;
|
|
// find 1st mismatch in rest of segment
|
|
if ( br !== bL ) {
|
|
for (;;) {
|
|
if ( br === bL ) { break; }
|
|
if ( ar === 0 ) { break; }
|
|
if ( buf8[br-1] !== buf8[aL+ar-1] ) { break; }
|
|
br -= 1;
|
|
ar -= 1;
|
|
}
|
|
}
|
|
// all segment characters matched
|
|
// a: ...vvvvvvv
|
|
// b: vvvvvvv
|
|
if ( br === bL ) {
|
|
inext = buf32[icell+CELL_AND];
|
|
// needle remainder: no
|
|
// a: vvvvvvv
|
|
// b: vvvvvvv
|
|
// r: 0 & vvvvvvv
|
|
if ( ar === 0 ) {
|
|
// boundary cell already present
|
|
if ( buf32[inext+BCELL_EXTRA] <= BCELL_EXTRA_MAX ) {
|
|
return inext;
|
|
}
|
|
// need boundary cell
|
|
iboundary = this.allocateCell();
|
|
buf32[iboundary+CELL_AND] = inext;
|
|
buf32[icell+CELL_AND] = iboundary;
|
|
return iboundary;
|
|
}
|
|
// needle remainder: yes
|
|
// a: yyyyyyyvvvvvvv
|
|
// b: vvvvvvv
|
|
else {
|
|
if ( inext !== 0 ) {
|
|
icell = inext;
|
|
continue;
|
|
}
|
|
// TODO: we should never reach here because there will
|
|
// always be a boundary cell.
|
|
// eslint-disable-next-line no-debugger
|
|
debugger; // jshint ignore:line
|
|
// boundary cell + needle remainder
|
|
inext = this.addCell(0, 0, 0);
|
|
buf32[icell+CELL_AND] = inext;
|
|
buf32[inext+CELL_AND] =
|
|
this.addCell(0, 0, toSegmentInfo(aL0, 0, ar));
|
|
}
|
|
}
|
|
// some segment characters matched
|
|
// a: ...vvvvvvv
|
|
// b: yyyyyyyvvvvvvv
|
|
else {
|
|
// split current cell
|
|
buf32[icell+SEGMENT_INFO] = (bR - br) << 24 | (br - char0);
|
|
inext = this.addCell(
|
|
buf32[icell+CELL_AND],
|
|
0,
|
|
(br - bL) << 24 | (bL - char0)
|
|
);
|
|
// needle remainder: no = need boundary cell
|
|
// a: vvvvvvv
|
|
// b: yyyyyyyvvvvvvv
|
|
// r: yyyyyyy & 0 & vvvvvvv
|
|
if ( ar === 0 ) {
|
|
iboundary = this.allocateCell();
|
|
buf32[icell+CELL_AND] = iboundary;
|
|
buf32[iboundary+CELL_AND] = inext;
|
|
return iboundary;
|
|
}
|
|
// needle remainder: yes = need new cell for remaining
|
|
// characters
|
|
// a: wwwwvvvvvvv
|
|
// b: yyyyyyyvvvvvvv
|
|
// r: (0 & wwww | yyyyyyy) & vvvvvvv
|
|
else {
|
|
buf32[icell+CELL_AND] = inext;
|
|
iboundary = this.allocateCell();
|
|
buf32[inext+CELL_OR] = this.addCell(
|
|
iboundary, 0, toSegmentInfo(aL0, 0, ar)
|
|
);
|
|
return iboundary;
|
|
}
|
|
}
|
|
//debugger; // jshint ignore:line
|
|
}
|
|
}
|
|
|
|
getExtra(iboundary) {
|
|
return this.buf32[iboundary+BCELL_EXTRA];
|
|
}
|
|
|
|
setExtra(iboundary, v) {
|
|
this.buf32[iboundary+BCELL_EXTRA] = v;
|
|
}
|
|
|
|
optimize(shrink = false) {
|
|
if ( shrink ) {
|
|
this.shrinkBuf();
|
|
}
|
|
return {
|
|
byteLength: this.buf8.byteLength,
|
|
char0: this.buf32[CHAR0_SLOT],
|
|
};
|
|
}
|
|
|
|
serialize(encoder) {
|
|
if ( encoder instanceof Object ) {
|
|
return encoder.encode(
|
|
this.buf32.buffer,
|
|
this.buf32[CHAR1_SLOT]
|
|
);
|
|
}
|
|
return Array.from(
|
|
new Uint32Array(
|
|
this.buf32.buffer,
|
|
0,
|
|
this.buf32[CHAR1_SLOT] + 3 >>> 2
|
|
)
|
|
);
|
|
}
|
|
|
|
unserialize(selfie, decoder) {
|
|
const shouldDecode = typeof selfie === 'string';
|
|
let byteLength = shouldDecode
|
|
? decoder.decodeSize(selfie)
|
|
: selfie.length << 2;
|
|
if ( byteLength === 0 ) { return false; }
|
|
this.reallocateBuf(byteLength);
|
|
if ( shouldDecode ) {
|
|
decoder.decode(selfie, this.buf8.buffer);
|
|
} else {
|
|
this.buf32.set(selfie);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
storeString(s) {
|
|
const n = s.length;
|
|
if ( n === this.lastStoredLen && s === this.lastStored ) {
|
|
return this.lastStoredIndex;
|
|
}
|
|
this.lastStored = s;
|
|
this.lastStoredLen = n;
|
|
if ( (this.buf8.length - this.buf32[CHAR1_SLOT]) < n ) {
|
|
this.growBuf(0, n);
|
|
}
|
|
const offset = this.buf32[CHAR1_SLOT];
|
|
this.buf32[CHAR1_SLOT] = offset + n;
|
|
const buf8 = this.buf8;
|
|
for ( let i = 0; i < n; i++ ) {
|
|
buf8[offset+i] = s.charCodeAt(i);
|
|
}
|
|
return (this.lastStoredIndex = offset - this.buf32[CHAR0_SLOT]);
|
|
}
|
|
|
|
extractString(i, n) {
|
|
if ( this.textDecoder === null ) {
|
|
this.textDecoder = new TextDecoder();
|
|
}
|
|
const offset = this.buf32[CHAR0_SLOT] + i;
|
|
return this.textDecoder.decode(
|
|
this.buf8.subarray(offset, offset + n)
|
|
);
|
|
}
|
|
|
|
// WASMable.
|
|
startsWith(haystackLeft, haystackRight, needleLeft, needleLen) {
|
|
if ( haystackLeft < 0 || (haystackLeft + needleLen) > haystackRight ) {
|
|
return 0;
|
|
}
|
|
const charCodes = this.buf8;
|
|
needleLeft += this.buf32[CHAR0_SLOT];
|
|
const needleRight = needleLeft + needleLen;
|
|
while ( charCodes[haystackLeft] === charCodes[needleLeft] ) {
|
|
needleLeft += 1;
|
|
if ( needleLeft === needleRight ) { return 1; }
|
|
haystackLeft += 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
// Find the left-most instance of substring in main string
|
|
// WASMable.
|
|
indexOf(haystackLeft, haystackEnd, needleLeft, needleLen) {
|
|
if ( needleLen === 0 ) { return haystackLeft; }
|
|
haystackEnd -= needleLen;
|
|
if ( haystackEnd < haystackLeft ) { return -1; }
|
|
needleLeft += this.buf32[CHAR0_SLOT];
|
|
const needleRight = needleLeft + needleLen;
|
|
const charCodes = this.buf8;
|
|
for (;;) {
|
|
let i = haystackLeft;
|
|
let j = needleLeft;
|
|
while ( charCodes[i] === charCodes[j] ) {
|
|
j += 1;
|
|
if ( j === needleRight ) { return haystackLeft; }
|
|
i += 1;
|
|
}
|
|
haystackLeft += 1;
|
|
if ( haystackLeft > haystackEnd ) { break; }
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
// Find the right-most instance of substring in main string.
|
|
// WASMable.
|
|
lastIndexOf(haystackBeg, haystackEnd, needleLeft, needleLen) {
|
|
if ( needleLen === 0 ) { return haystackBeg; }
|
|
let haystackLeft = haystackEnd - needleLen;
|
|
if ( haystackLeft < haystackBeg ) { return -1; }
|
|
needleLeft += this.buf32[CHAR0_SLOT];
|
|
const needleRight = needleLeft + needleLen;
|
|
const charCodes = this.buf8;
|
|
for (;;) {
|
|
let i = haystackLeft;
|
|
let j = needleLeft;
|
|
while ( charCodes[i] === charCodes[j] ) {
|
|
j += 1;
|
|
if ( j === needleRight ) { return haystackLeft; }
|
|
i += 1;
|
|
}
|
|
if ( haystackLeft === haystackBeg ) { break; }
|
|
haystackLeft -= 1;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
dumpTrie(iroot) {
|
|
for ( const s of this.trieIterator(iroot) ) {
|
|
console.log(s);
|
|
}
|
|
}
|
|
|
|
trieIterator(iroot) {
|
|
return {
|
|
value: undefined,
|
|
done: false,
|
|
next() {
|
|
if ( this.icell === 0 ) {
|
|
if ( this.forks.length === 0 ) {
|
|
this.value = undefined;
|
|
this.done = true;
|
|
return this;
|
|
}
|
|
this.pattern = this.forks.pop();
|
|
this.dir = this.forks.pop();
|
|
this.icell = this.forks.pop();
|
|
}
|
|
const buf32 = this.container.buf32;
|
|
const buf8 = this.container.buf8;
|
|
for (;;) {
|
|
const ialt = buf32[this.icell+CELL_OR];
|
|
const v = buf32[this.icell+SEGMENT_INFO];
|
|
const offset = v & 0x00FFFFFF;
|
|
let i0 = buf32[CHAR0_SLOT] + offset;
|
|
const len = v >>> 24;
|
|
for ( let i = 0; i < len; i++ ) {
|
|
this.charBuf[i] = buf8[i0+i];
|
|
}
|
|
if ( len !== 0 && ialt !== 0 ) {
|
|
this.forks.push(ialt, this.dir, this.pattern);
|
|
}
|
|
const inext = buf32[this.icell+CELL_AND];
|
|
if ( len !== 0 ) {
|
|
const s = this.textDecoder.decode(
|
|
new Uint8Array(this.charBuf.buffer, 0, len)
|
|
);
|
|
if ( this.dir > 0 ) {
|
|
this.pattern += s;
|
|
} else if ( this.dir < 0 ) {
|
|
this.pattern = s + this.pattern;
|
|
}
|
|
}
|
|
this.icell = inext;
|
|
if ( len !== 0 ) { continue; }
|
|
// boundary cell
|
|
if ( ialt !== 0 ) {
|
|
if ( inext === 0 ) {
|
|
this.icell = ialt;
|
|
this.dir = -1;
|
|
} else {
|
|
this.forks.push(ialt, -1, this.pattern);
|
|
}
|
|
}
|
|
if ( offset !== 0 ) {
|
|
this.value = { pattern: this.pattern, iextra: offset };
|
|
return this;
|
|
}
|
|
}
|
|
},
|
|
container: this,
|
|
icell: iroot,
|
|
charBuf: new Uint8Array(256),
|
|
pattern: '',
|
|
dir: 1,
|
|
forks: [],
|
|
textDecoder: new TextDecoder(),
|
|
[Symbol.iterator]() { return this; },
|
|
};
|
|
}
|
|
|
|
async enableWASM(wasmModuleFetcher, path) {
|
|
if ( typeof WebAssembly !== 'object' ) { return false; }
|
|
if ( this.wasmMemory instanceof WebAssembly.Memory ) { return true; }
|
|
const module = await getWasmModule(wasmModuleFetcher, path);
|
|
if ( module instanceof WebAssembly.Module === false ) { return false; }
|
|
const memory = new WebAssembly.Memory({
|
|
initial: roundToPageSize(this.buf8.length) >>> 16
|
|
});
|
|
const instance = await WebAssembly.instantiate(module, {
|
|
imports: { memory, extraHandler: this.extraHandler }
|
|
});
|
|
if ( instance instanceof WebAssembly.Instance === false ) {
|
|
return false;
|
|
}
|
|
this.wasmMemory = memory;
|
|
const curPageCount = memory.buffer.byteLength >>> 16;
|
|
const newPageCount = roundToPageSize(this.buf8.byteLength) >>> 16;
|
|
if ( newPageCount > curPageCount ) {
|
|
memory.grow(newPageCount - curPageCount);
|
|
}
|
|
const buf8 = new Uint8Array(memory.buffer);
|
|
buf8.set(this.buf8);
|
|
this.buf8 = buf8;
|
|
this.buf32 = new Uint32Array(this.buf8.buffer);
|
|
this.haystack = this.buf8.subarray(
|
|
HAYSTACK_START,
|
|
HAYSTACK_START + HAYSTACK_SIZE
|
|
);
|
|
this.matches = instance.exports.matches;
|
|
this.startsWith = instance.exports.startsWith;
|
|
this.indexOf = instance.exports.indexOf;
|
|
this.lastIndexOf = instance.exports.lastIndexOf;
|
|
return true;
|
|
}
|
|
|
|
dumpInfo() {
|
|
return [
|
|
`Buffer size (Uint8Array): ${this.buf32[CHAR1_SLOT].toLocaleString('en')}`,
|
|
`WASM: ${this.wasmMemory === null ? 'disabled' : 'enabled'}`,
|
|
].join('\n');
|
|
}
|
|
|
|
//--------------------------------------------------------------------------
|
|
// Private methods
|
|
//--------------------------------------------------------------------------
|
|
|
|
allocateCell() {
|
|
let icell = this.buf32[TRIE1_SLOT];
|
|
this.buf32[TRIE1_SLOT] = icell + CELL_BYTE_LENGTH;
|
|
icell >>>= 2;
|
|
this.buf32[icell+0] = 0;
|
|
this.buf32[icell+1] = 0;
|
|
this.buf32[icell+2] = 0;
|
|
return icell;
|
|
}
|
|
|
|
addCell(iand, ior, v) {
|
|
const icell = this.allocateCell();
|
|
this.buf32[icell+CELL_AND] = iand;
|
|
this.buf32[icell+CELL_OR] = ior;
|
|
this.buf32[icell+SEGMENT_INFO] = v;
|
|
return icell;
|
|
}
|
|
|
|
growBuf(trieGrow, charGrow) {
|
|
const char0 = Math.max(
|
|
roundToPageSize(this.buf32[TRIE1_SLOT] + trieGrow),
|
|
this.buf32[CHAR0_SLOT]
|
|
);
|
|
const char1 = char0 + this.buf32[CHAR1_SLOT] - this.buf32[CHAR0_SLOT];
|
|
const bufLen = Math.max(
|
|
roundToPageSize(char1 + charGrow),
|
|
this.buf8.length
|
|
);
|
|
if ( bufLen > this.buf8.length ) {
|
|
this.reallocateBuf(bufLen);
|
|
}
|
|
if ( char0 !== this.buf32[CHAR0_SLOT] ) {
|
|
this.buf8.copyWithin(
|
|
char0,
|
|
this.buf32[CHAR0_SLOT],
|
|
this.buf32[CHAR1_SLOT]
|
|
);
|
|
this.buf32[CHAR0_SLOT] = char0;
|
|
this.buf32[CHAR1_SLOT] = char1;
|
|
}
|
|
}
|
|
|
|
shrinkBuf() {
|
|
const char0 = this.buf32[TRIE1_SLOT] + MIN_FREE_CELL_BYTE_LENGTH;
|
|
const char1 = char0 + this.buf32[CHAR1_SLOT] - this.buf32[CHAR0_SLOT];
|
|
const bufLen = char1 + 256;
|
|
if ( char0 !== this.buf32[CHAR0_SLOT] ) {
|
|
this.buf8.copyWithin(
|
|
char0,
|
|
this.buf32[CHAR0_SLOT],
|
|
this.buf32[CHAR1_SLOT]
|
|
);
|
|
this.buf32[CHAR0_SLOT] = char0;
|
|
this.buf32[CHAR1_SLOT] = char1;
|
|
}
|
|
if ( bufLen < this.buf8.length ) {
|
|
this.reallocateBuf(bufLen);
|
|
}
|
|
}
|
|
|
|
reallocateBuf(newSize) {
|
|
newSize = roundToPageSize(newSize);
|
|
if ( newSize === this.buf8.length ) { return; }
|
|
if ( this.wasmMemory === null ) {
|
|
const newBuf = new Uint8Array(newSize);
|
|
newBuf.set(
|
|
newBuf.length < this.buf8.length
|
|
? this.buf8.subarray(0, newBuf.length)
|
|
: this.buf8
|
|
);
|
|
this.buf8 = newBuf;
|
|
} else {
|
|
const growBy =
|
|
((newSize + 0xFFFF) >>> 16) - (this.buf8.length >>> 16);
|
|
if ( growBy <= 0 ) { return; }
|
|
this.wasmMemory.grow(growBy);
|
|
this.buf8 = new Uint8Array(this.wasmMemory.buffer);
|
|
}
|
|
this.buf32 = new Uint32Array(this.buf8.buffer);
|
|
this.haystack = this.buf8.subarray(
|
|
HAYSTACK_START,
|
|
HAYSTACK_START + HAYSTACK_SIZE
|
|
);
|
|
}
|
|
}
|
|
|
|
/******************************************************************************/
|
|
|
|
// Code below is to attempt to load a WASM module which implements:
|
|
//
|
|
// - BidiTrieContainer.startsWith()
|
|
//
|
|
// The WASM module is entirely optional, the JS implementations will be
|
|
// used should the WASM module be unavailable for whatever reason.
|
|
|
|
const getWasmModule = (( ) => {
|
|
let wasmModulePromise;
|
|
|
|
return async function(wasmModuleFetcher, path) {
|
|
if ( wasmModulePromise instanceof Promise ) {
|
|
return wasmModulePromise;
|
|
}
|
|
|
|
if ( typeof WebAssembly !== 'object' ) { return; }
|
|
|
|
// Soft-dependency on vAPI so that the code here can be used outside of
|
|
// uBO (i.e. tests, benchmarks)
|
|
if ( typeof vAPI === 'object' && vAPI.canWASM !== true ) { return; }
|
|
|
|
// The wasm module will work only if CPU is natively little-endian,
|
|
// as we use native uint32 array in our js code.
|
|
const uint32s = new Uint32Array(1);
|
|
const uint8s = new Uint8Array(uint32s.buffer);
|
|
uint32s[0] = 1;
|
|
if ( uint8s[0] !== 1 ) { return; }
|
|
|
|
wasmModulePromise = wasmModuleFetcher(`${path}biditrie`).catch(reason => {
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console.info(reason);
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});
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return wasmModulePromise;
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};
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})();
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/******************************************************************************/
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export default BidiTrieContainer;
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