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| 1 | <?php |
| 2 | /** |
| 3 | * Copyright 2023 Wikimedia Foundation |
| 4 | * |
| 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at |
| 8 | * |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
| 16 | * |
| 17 | * @file |
| 18 | * @license Apache-2.0 |
| 19 | * @license MIT |
| 20 | * @license GPL-2.0-or-later |
| 21 | * @license LGPL-2.1-or-later |
| 22 | */ |
| 23 | |
| 24 | namespace Wikimedia\Minify; |
| 25 | |
| 26 | /** |
| 27 | * A class representing an index map, as defined by the source map |
| 28 | * specification. This allows several mapped sources to be combined into a |
| 29 | * single file. |
| 30 | */ |
| 31 | class IndexMap { |
| 32 | /** @var string|null */ |
| 33 | private $file; |
| 34 | /** @var IndexMapOffset */ |
| 35 | private $offset; |
| 36 | /** @var array */ |
| 37 | private $sections; |
| 38 | |
| 39 | /** |
| 40 | * Create an empty index map |
| 41 | */ |
| 42 | public function __construct() { |
| 43 | $this->offset = new IndexMapOffset( 0, 0 ); |
| 44 | $this->sections = []; |
| 45 | } |
| 46 | |
| 47 | /** |
| 48 | * Set the name of the output file, to be given as the "file" key. |
| 49 | * |
| 50 | * @param string $file |
| 51 | * @return $this |
| 52 | */ |
| 53 | public function outputFile( string $file ) { |
| 54 | $this->file = $file; |
| 55 | return $this; |
| 56 | } |
| 57 | |
| 58 | /** |
| 59 | * Add a section with a source map which was encoded in the "raw" JSON format. |
| 60 | * |
| 61 | * @param string $mapJson The JSON-encoded source map. |
| 62 | * @param IndexMapOffset $generatedSize The size of the generated output |
| 63 | * corresponding to $mapJson. This is used to advance the current offset |
| 64 | * and will be used to calculate the offset of the next section, if there |
| 65 | * is one. |
| 66 | * @return $this |
| 67 | */ |
| 68 | public function addEncodedMap( string $mapJson, IndexMapOffset $generatedSize ) { |
| 69 | $this->sections[] = |
| 70 | '{"offset":' . |
| 71 | json_encode( [ |
| 72 | 'line' => $this->offset->line, |
| 73 | 'column' => $this->offset->column, |
| 74 | ] ) . |
| 75 | ',"map":' . |
| 76 | $mapJson . |
| 77 | '}'; |
| 78 | $this->offset->add( $generatedSize ); |
| 79 | return $this; |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * Get the index map, encoded as JSON |
| 84 | * |
| 85 | * @return string |
| 86 | */ |
| 87 | public function getMap(): string { |
| 88 | $map = "{\n" . |
| 89 | "\"version\": 3,\n"; |
| 90 | if ( $this->file !== null ) { |
| 91 | $map .= '"file": ' . json_encode( $this->file ) . ",\n"; |
| 92 | } |
| 93 | $map .= "\"sections\": [\n"; |
| 94 | if ( $this->sections ) { |
| 95 | $map .= implode( ",\n", $this->sections ) . "\n"; |
| 96 | } |
| 97 | $map .= "]\n}"; |
| 98 | return $map; |
| 99 | } |
| 100 | } |