gnuzilla

static-filtering-io.js (4538B) - View raw

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142


/*******************************************************************************

    uBlock Origin - a comprehensive, efficient content blocker
    Copyright (C) 2014-present Raymond Hill

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see {http://www.gnu.org/licenses/}.

    Home: https://github.com/gorhill/uBlock
*/

/******************************************************************************/

// https://www.reddit.com/r/uBlockOrigin/comments/oq6kt5/ubo_loads_generic_filter_instead_of_specific/
//   Ensure blocks of content are sorted in ascending id order, such that the
//   specific cosmetic filters will be found (and thus reported) before the
//   generic ones.

const serialize = JSON.stringify;
const unserialize = JSON.parse;

const blockStartPrefix = '#block-start-';  // ensure no special regex characters
const blockEndPrefix = '#block-end-';      // ensure no special regex characters

class CompiledListWriter {
    constructor() {
        this.blockId = undefined;
        this.block = undefined;
        this.blocks = new Map();
        this.properties = new Map();
    }
    push(args) {
        this.block.push(serialize(args));
    }
    pushMany(many) {
        for ( const args of many ) {
            this.block.push(serialize(args));
        }
    }
    last() {
        if ( Array.isArray(this.block) && this.block.length !== 0 ) {
            return this.block[this.block.length - 1];
        }
    }
    select(blockId) {
        if ( blockId === this.blockId ) { return; }
        this.blockId = blockId;
        this.block = this.blocks.get(blockId);
        if ( this.block === undefined ) {
            this.blocks.set(blockId, (this.block = []));
        }
        return this;
    }
    toString() {
        const result = [];
        const sortedBlocks =
            Array.from(this.blocks).sort((a, b) => a[0] - b[0]);
        for ( const [ id, lines ] of sortedBlocks ) {
            if ( lines.length === 0 ) { continue; }
            result.push(
                blockStartPrefix + id,
                lines.join('\n'),
                blockEndPrefix + id
            );
        }
        return result.join('\n');
    }
    static serialize(arg) {
        return serialize(arg);
    }
}

class CompiledListReader {
    constructor(raw, blockId) {
        this.block = '';
        this.len = 0;
        this.offset = 0;
        this.line = '';
        this.blocks = new Map();
        this.properties = new Map();
        const reBlockStart = new RegExp(`^${blockStartPrefix}([\\w:]+)\\n`, 'gm');
        let match = reBlockStart.exec(raw);
        while ( match !== null ) {
            const sectionId = match[1];
            const beg = match.index + match[0].length;
            const end = raw.indexOf(blockEndPrefix + sectionId, beg);
            this.blocks.set(sectionId, raw.slice(beg, end));
            reBlockStart.lastIndex = end;
            match = reBlockStart.exec(raw);
        }
        if ( blockId !== undefined ) {
            this.select(blockId);
        }
    }
    next() {
        if ( this.offset === this.len ) {
            this.line = '';
            return false;
        }
        let pos = this.block.indexOf('\n', this.offset);
        if ( pos !== -1 ) {
            this.line = this.block.slice(this.offset, pos);
            this.offset = pos + 1;
        } else {
            this.line = this.block.slice(this.offset);
            this.offset = this.len;
        }
        return true;
    }
    select(blockId) {
        this.block = this.blocks.get(blockId) || '';
        this.len = this.block.length;
        this.offset = 0;
        return this;
    }
    fingerprint() {
        return this.line;
    }
    args() {
        return unserialize(this.line);
    }
    static unserialize(arg) {
        return unserialize(arg);
    }
}

/******************************************************************************/

export {
    CompiledListReader,
    CompiledListWriter,
};