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| 1 | <?php |
| 2 | /** |
| 3 | * Copyright 2022 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 | * Utility class to generate the "mappings" string of a source map. |
| 28 | * |
| 29 | * @internal |
| 30 | */ |
| 31 | class MappingsGenerator { |
| 32 | /** @var string */ |
| 33 | private $source = ''; |
| 34 | |
| 35 | /** @var int The current source file offset in bytes */ |
| 36 | private $curSourceOffset = 0; |
| 37 | |
| 38 | /** @var int The current source file index */ |
| 39 | private $curSourceFile = -1; |
| 40 | /** @var int The current source file line number */ |
| 41 | private $curSourceLine = 0; |
| 42 | /** @var int The current source file column in UTF-16 code units */ |
| 43 | private $curSourceColumn = 0; |
| 44 | /** @var int The current output file line number */ |
| 45 | private $curOutLine = 0; |
| 46 | /** @var int The current output file column in UTF-16 code units */ |
| 47 | private $curOutColumn = 0; |
| 48 | |
| 49 | /** @var int The base of the delta encoding for source file index */ |
| 50 | private $prevSourceFile = 0; |
| 51 | /** @var int The base of the delta encoding for source file line number */ |
| 52 | private $prevSourceLine = 0; |
| 53 | /** @var int The base of the delta encoding for source file line column */ |
| 54 | private $prevSourceColumn = 0; |
| 55 | /** @var int The base of the delta encoding for output file line number */ |
| 56 | private $prevOutLine = 0; |
| 57 | /** @var int The base of the delta encoding for output file column */ |
| 58 | private $prevOutColumn = 0; |
| 59 | |
| 60 | /** @var bool Whether to omit a leading separator when generating a segment */ |
| 61 | private $isFirstSegment = true; |
| 62 | |
| 63 | /** @var string The accumulated mapping string */ |
| 64 | private $mappings = ''; |
| 65 | |
| 66 | /** @var string The base-64 encoding table */ |
| 67 | private const BASE64_TABLE = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'; |
| 68 | |
| 69 | /** |
| 70 | * Advance to the next source file. |
| 71 | * |
| 72 | * @param string $source The contents of the new file |
| 73 | */ |
| 74 | public function nextSourceFile( $source ) { |
| 75 | $this->source = $source; |
| 76 | $this->curSourceFile++; |
| 77 | $this->curSourceOffset = 0; |
| 78 | $this->curSourceLine = 0; |
| 79 | $this->curSourceColumn = 0; |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * Advance the source position by the specified number of bytes. |
| 84 | * |
| 85 | * @param int $length |
| 86 | */ |
| 87 | public function consumeSource( $length ) { |
| 88 | $newOffset = $this->curSourceOffset + $length; |
| 89 | $lineCount = substr_count( $this->source, "\n", $this->curSourceOffset, $length ); |
| 90 | if ( $lineCount ) { |
| 91 | $lineStartPos = |
| 92 | strrpos( |
| 93 | substr( $this->source, $this->curSourceOffset, $length ), |
| 94 | "\n" |
| 95 | ) + $this->curSourceOffset + 1; |
| 96 | $this->curSourceLine += $lineCount; |
| 97 | $this->curSourceColumn = Utils::getJsLength( |
| 98 | substr( $this->source, $lineStartPos, $newOffset - $lineStartPos ) ); |
| 99 | } else { |
| 100 | $this->curSourceColumn += Utils::getJsLength( |
| 101 | substr( $this->source, $this->curSourceOffset, $length ) ); |
| 102 | } |
| 103 | $this->curSourceOffset = $newOffset; |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * Notify the source map generator of the generated text output, which |
| 108 | * should not generate a mapping segment. |
| 109 | * |
| 110 | * @param string $out |
| 111 | */ |
| 112 | public function outputSpace( $out ) { |
| 113 | $lineCount = substr_count( $out, "\n" ); |
| 114 | if ( $lineCount ) { |
| 115 | $lineStartPos = strrpos( $out, "\n" ) + 1; |
| 116 | $this->curOutLine += $lineCount; |
| 117 | $this->curOutColumn = Utils::getJsLength( |
| 118 | substr( $out, $lineStartPos, strlen( $out ) - $lineStartPos ) ); |
| 119 | } else { |
| 120 | $this->curOutColumn += Utils::getJsLength( $out ); |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | /** |
| 125 | * Notify the source map generator of the generated text output, which |
| 126 | * should generate a mapping segment. Append the mapping segment to the |
| 127 | * internal buffer. |
| 128 | * |
| 129 | * @param string $out |
| 130 | */ |
| 131 | public function outputToken( $out ) { |
| 132 | $outLineDelta = $this->curOutLine - $this->prevOutLine; |
| 133 | if ( $outLineDelta > 0 ) { |
| 134 | $this->mappings .= str_repeat( ';', $outLineDelta ); |
| 135 | $this->prevOutColumn = 0; |
| 136 | $this->isFirstSegment = false; |
| 137 | } elseif ( $this->isFirstSegment ) { |
| 138 | $this->isFirstSegment = false; |
| 139 | } else { |
| 140 | $this->mappings .= ','; |
| 141 | } |
| 142 | |
| 143 | $this->appendNumber( $this->curOutColumn - $this->prevOutColumn ); |
| 144 | $this->appendNumber( $this->curSourceFile - $this->prevSourceFile ); |
| 145 | $this->appendNumber( $this->curSourceLine - $this->prevSourceLine ); |
| 146 | $this->appendNumber( $this->curSourceColumn - $this->prevSourceColumn ); |
| 147 | |
| 148 | $this->prevSourceFile = $this->curSourceFile; |
| 149 | $this->prevOutLine = $this->curOutLine; |
| 150 | $this->prevOutColumn = $this->curOutColumn; |
| 151 | $this->prevSourceLine = $this->curSourceLine; |
| 152 | $this->prevSourceColumn = $this->curSourceColumn; |
| 153 | |
| 154 | $this->outputSpace( $out ); |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * Append a VLQ encoded number to the buffer. |
| 159 | * |
| 160 | * @param int $n |
| 161 | */ |
| 162 | private function appendNumber( $n ) { |
| 163 | $encoded = ''; |
| 164 | |
| 165 | // The sign bit goes in the LSB for some reason |
| 166 | $vlq = $n < 0 ? ( -$n << 1 ) | 1 : $n << 1; |
| 167 | |
| 168 | do { |
| 169 | $digit = $vlq & 0x1f; |
| 170 | $vlq >>= 5; |
| 171 | if ( $vlq > 0 ) { |
| 172 | $digit |= 0x20; |
| 173 | } |
| 174 | $encoded .= self::BASE64_TABLE[$digit]; |
| 175 | } while ( $vlq > 0 ); |
| 176 | |
| 177 | $this->mappings .= $encoded; |
| 178 | } |
| 179 | |
| 180 | /** |
| 181 | * Get the generated mappings string. |
| 182 | * |
| 183 | * @return string |
| 184 | */ |
| 185 | public function getMap() { |
| 186 | return $this->mappings; |
| 187 | } |
| 188 | } |