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| 1 | <?php |
| 2 | /** |
| 3 | * @author Tomás Bolaño |
| 4 | * @ingroup Cargo |
| 5 | */ |
| 6 | |
| 7 | class CargoBibtexFormat extends CargoDeferredFormat { |
| 8 | |
| 9 | public static function allowedParameters() { |
| 10 | return [ |
| 11 | 'default entry type' => [ 'type' => 'string' ], |
| 12 | 'link text' => [ 'type' => 'string' ] |
| 13 | ]; |
| 14 | } |
| 15 | |
| 16 | /** |
| 17 | * Returns the first word from $title with a length equal or greater than |
| 18 | * $numChars. If no word exists, it repeats the process for $numChars-1, |
| 19 | * $numChars-2, etc., until a word is found. Before returning the word, it |
| 20 | * removes all non-alphabetic characters. |
| 21 | * |
| 22 | * @param string $title |
| 23 | * @param int $numChars |
| 24 | */ |
| 25 | private static function generateTitleKey( $title, $numChars = 5 ) { |
| 26 | $titleKey = ''; |
| 27 | if ( $title != '' && $numChars > 0 ) { |
| 28 | $titleWords = explode( ' ', str_replace( '-', ' ', strtolower( $title ) ) ); |
| 29 | for ( $i = $numChars; $i > 0; $i-- ) { |
| 30 | foreach ( $titleWords as $titleWord ) { |
| 31 | if ( strlen( $titleWord ) >= $i ) { |
| 32 | $titleKey = preg_replace( "/[^a-zA-Z]/", '', $titleWord ); |
| 33 | break 2; |
| 34 | } |
| 35 | } |
| 36 | } |
| 37 | } |
| 38 | return $titleKey; |
| 39 | } |
| 40 | |
| 41 | /** |
| 42 | * Returns the last name of the first author. Before returning the last |
| 43 | * name, removes all non-alphabetic characters. |
| 44 | * |
| 45 | * @param string $author The list of authors in bibtex format. |
| 46 | */ |
| 47 | private static function generateAuthorKey( $author ) { |
| 48 | $authorKey = ''; |
| 49 | if ( $author != '' ) { |
| 50 | $authorList = explode( ' and ', $author ); |
| 51 | $firstAuthor = trim( $authorList[0] ); |
| 52 | |
| 53 | // A bibtex author can be in different formats: |
| 54 | // - First von Last |
| 55 | // - von Last, First |
| 56 | // - von Last, Jr, First |
| 57 | // where von is a lowercase particle such as "de" or "de la" |
| 58 | if ( strpos( $firstAuthor, ',' ) != false ) { |
| 59 | $vonLast = trim( strtok( $firstAuthor, ',' ) ); |
| 60 | $nameElems = explode( ' ', $vonLast ); |
| 61 | } else { |
| 62 | $nameElems = explode( ' ', $firstAuthor ); |
| 63 | } |
| 64 | $lastName = end( $nameElems ); |
| 65 | |
| 66 | // If the name has an hyphen ('-') we will keep only the first part |
| 67 | $authorKey = preg_replace( "/[^a-zA-Z]/", '', strtok( $lastName, '-' ) ); |
| 68 | $authorKey = strtolower( $authorKey ); |
| 69 | } |
| 70 | |
| 71 | return $authorKey; |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * Returns a key for an entry given the author, the title, and the year. |
| 76 | */ |
| 77 | private static function generateEntryKey( $author, $title, $year ) { |
| 78 | return self::generateAuthorKey( $author ) . $year . self::generateTitleKey( $title ); |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * BibTeX month abbreviations |
| 83 | * |
| 84 | * @var string[] |
| 85 | */ |
| 86 | private static $monthStrings = [ 'jan', 'feb', 'mar', 'apr', 'may', |
| 87 | 'jun', 'jul', 'aug', 'sep', 'oct', 'nov', 'dec' ]; |
| 88 | |
| 89 | /** |
| 90 | * This is the list of BibTeX fields that do not have special cases for |
| 91 | * generating the output. Fields that have special cases are: title, author, |
| 92 | * editor, pages, month, and year. |
| 93 | * |
| 94 | * @var string[] |
| 95 | */ |
| 96 | private static $bibtexFields = [ 'address', 'annote', 'booktitle', |
| 97 | 'chapter', 'crossref', 'doi', 'edition', 'howpublished', 'institution', |
| 98 | 'journal', 'key', 'note', 'number', 'organization', 'publisher', |
| 99 | 'school', 'series', 'type', 'volume' ]; |
| 100 | |
| 101 | public static function generateBibtexEntries( $valuesTable, $fieldDescriptions, $displayParams ) { |
| 102 | $defaultEntryType = strtolower( $displayParams['default entry type'] ?? 'article' ); |
| 103 | |
| 104 | // We check here the existing fields so that we do not need later |
| 105 | // to call the array_key_exists function in the for loop |
| 106 | $bibtexkeyExists = array_key_exists( 'bibtexkey', $fieldDescriptions ); |
| 107 | $entryTypeExists = array_key_exists( 'entrytype', $fieldDescriptions ); |
| 108 | |
| 109 | $dateExists = array_key_exists( 'date', $fieldDescriptions ); |
| 110 | $yearExists = array_key_exists( 'year', $fieldDescriptions ); |
| 111 | $monthExists = array_key_exists( 'month', $fieldDescriptions ); |
| 112 | |
| 113 | $authorExists = array_key_exists( 'author', $fieldDescriptions ); |
| 114 | $editorExists = array_key_exists( 'editor', $fieldDescriptions ); |
| 115 | $titleExists = array_key_exists( 'title', $fieldDescriptions ); |
| 116 | |
| 117 | $pagesExists = array_key_exists( 'pages', $fieldDescriptions ); |
| 118 | $initialPageExists = array_key_exists( 'initialpage', $fieldDescriptions ); |
| 119 | $lastPageExists = array_key_exists( 'lastpage', $fieldDescriptions ); |
| 120 | |
| 121 | // generate array of bibtex fields to output |
| 122 | $bibtexOutputFields = []; |
| 123 | foreach ( self::$bibtexFields as $bibtexField ) { |
| 124 | if ( array_key_exists( $bibtexField, $fieldDescriptions ) ) { |
| 125 | $bibtexOutputFields[] = $bibtexField; |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | // Define several strings that will be used to generate the output |
| 130 | $tabString = ' '; |
| 131 | $newlineString = "\n"; |
| 132 | $bibtexEntryBeforeString = ''; |
| 133 | $bibtexEntryAfterString = "\n\n"; |
| 134 | |
| 135 | $text = ''; |
| 136 | foreach ( $valuesTable as $value ) { |
| 137 | if ( $entryTypeExists && $value['entrytype'] != '' ) { |
| 138 | $entryType = $value['entrytype']; |
| 139 | } else { |
| 140 | $entryType = $defaultEntryType; |
| 141 | } |
| 142 | |
| 143 | // Obtain values for the fields year, month, author, editor, and title |
| 144 | if ( $dateExists && $value['date'] != '' ) { |
| 145 | $year = strtok( $value['date'], '-' ); |
| 146 | if ( $value['date__precision'] <= 2 ) { |
| 147 | $month = ltrim( strtok( '-' ), '0' ); |
| 148 | } else { |
| 149 | $month = ''; |
| 150 | } |
| 151 | } else { |
| 152 | $year = $yearExists ? $value['year'] : ''; |
| 153 | $month = $monthExists ? $value['month'] : ''; |
| 154 | } |
| 155 | |
| 156 | if ( $authorExists && $value['author'] != '' ) { |
| 157 | if ( $fieldDescriptions['author']->mIsList ) { |
| 158 | $delimiter = $fieldDescriptions['author']->getDelimiter(); |
| 159 | $author = str_replace( $delimiter, ' and ', $value['author'] ); |
| 160 | } else { |
| 161 | $author = $value['author']; |
| 162 | } |
| 163 | } else { |
| 164 | $author = ''; |
| 165 | } |
| 166 | |
| 167 | if ( $editorExists && $value['editor'] != '' ) { |
| 168 | if ( $fieldDescriptions['editor']->mIsList ) { |
| 169 | $delimiter = $fieldDescriptions['editor']->getDelimiter(); |
| 170 | $editor = str_replace( $delimiter, ' and ', $value['editor'] ); |
| 171 | } else { |
| 172 | $editor = $value['editor']; |
| 173 | } |
| 174 | } else { |
| 175 | $editor = ''; |
| 176 | } |
| 177 | |
| 178 | $title = $titleExists ? $value['title'] : ''; |
| 179 | |
| 180 | // Generate the entry header (entry type and key) |
| 181 | $text .= $bibtexEntryBeforeString; |
| 182 | $text .= '@' . $entryType . '{'; |
| 183 | if ( $bibtexkeyExists && $value['bibtexkey'] != '' ) { |
| 184 | $text .= $value['bibtexkey']; |
| 185 | } else { |
| 186 | $text .= self::generateEntryKey( $author, $title, $year ); |
| 187 | } |
| 188 | $text .= ',' . $newlineString; |
| 189 | |
| 190 | // Generate title, author, and editor fields |
| 191 | if ( $title != '' ) { |
| 192 | $text .= $tabString . 'title={' . $title . '},' . $newlineString; |
| 193 | } |
| 194 | |
| 195 | if ( $author != '' ) { |
| 196 | $text .= $tabString . 'author={' . $author . '},' . $newlineString; |
| 197 | } |
| 198 | |
| 199 | if ( $editor != '' ) { |
| 200 | $text .= $tabString . 'editor={' . $editor . '},' . $newlineString; |
| 201 | } |
| 202 | |
| 203 | // Generate remaining fields (except pages, year, and month) |
| 204 | foreach ( $bibtexOutputFields as $bibtexOutputField ) { |
| 205 | if ( $value[$bibtexOutputField] != '' ) { |
| 206 | $text .= $tabString . $bibtexOutputField . '={' . $value[$bibtexOutputField] . '},' . $newlineString; |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | // Generate pages, year, and month fields |
| 211 | if ( $pagesExists && $value['pages'] != '' ) { |
| 212 | $text .= $tabString . 'pages={' . $value['pages'] . '}' . $newlineString; |
| 213 | } elseif ( $initialPageExists && $lastPageExists && $value['initialpage'] != '' ) { |
| 214 | $pages = $value['initialpage']; |
| 215 | if ( $value['lastpage'] != '' && $value['initialpage'] != $value['lastpage'] ) { |
| 216 | $pages .= '--' . $value['lastpage']; |
| 217 | } |
| 218 | $text .= $tabString . 'pages={' . $pages . '},' . $newlineString; |
| 219 | } |
| 220 | |
| 221 | if ( $year != '' ) { |
| 222 | $text .= $tabString . 'year={' . $year . '},' . $newlineString; |
| 223 | } |
| 224 | |
| 225 | if ( $month != '' ) { |
| 226 | // For the month field, if it is passed as a number between 1 |
| 227 | // and 12 we use the three letter month abbreviation (i.e., jan, |
| 228 | // feb, mar, etc.). If it is passed as any other string, then |
| 229 | // that string will be used. |
| 230 | if ( $month >= 1 && $month <= 12 ) { |
| 231 | $text .= $tabString . 'month=' . self::$monthStrings[$month - 1] . ',' . $newlineString; |
| 232 | } else { |
| 233 | $text .= $tabString . 'month={' . $month . '},' . $newlineString; |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | $text .= '}'; |
| 238 | $text .= $bibtexEntryAfterString; |
| 239 | } |
| 240 | |
| 241 | return $text; |
| 242 | } |
| 243 | |
| 244 | /** |
| 245 | * This function creates a link for the query. The query and the bibtex |
| 246 | * generation are actually executed by the function displayBibtexData of the |
| 247 | * CargoExport class. |
| 248 | * |
| 249 | * @param array $sqlQueries |
| 250 | * @param array $displayParams |
| 251 | * @param array|null $querySpecificParams Unused |
| 252 | * @return string HTML |
| 253 | */ |
| 254 | public function queryAndDisplay( $sqlQueries, $displayParams, $querySpecificParams = null ) { |
| 255 | $ce = SpecialPage::getTitleFor( 'CargoExport' ); |
| 256 | $queryParams = $this->sqlQueriesToQueryParams( $sqlQueries ); |
| 257 | $queryParams['format'] = 'bibtex'; |
| 258 | if ( array_key_exists( 'default entry type', $displayParams ) && $displayParams['default entry type'] != '' ) { |
| 259 | $queryParams['default entry type'] = $displayParams['default entry type']; |
| 260 | } |
| 261 | if ( array_key_exists( 'link text', $displayParams ) && $displayParams['link text'] != '' ) { |
| 262 | $linkText = $displayParams['link text']; |
| 263 | } else { |
| 264 | $linkText = wfMessage( 'cargo-viewbibtex' )->text(); |
| 265 | } |
| 266 | $linkAttrs = [ |
| 267 | 'href' => $ce->getFullURL( $queryParams ), |
| 268 | 'target' => '_blank' // link will open in a new tab |
| 269 | ]; |
| 270 | $text = Html::rawElement( 'a', $linkAttrs, $linkText ); |
| 271 | |
| 272 | return $text; |
| 273 | } |
| 274 | |
| 275 | } |