1<?php 2 3namespace dokuwiki\Parsing\ParserMode; 4 5/** 6 * GFM inline code span bounded by double backticks: ``text``. 7 * 8 * The whole point of the double form is to let users embed literal 9 * backticks in inline code. The input ``foo`bar`` renders as 10 * <code>foo`bar</code> because a lone backtick in the body cannot 11 * form a valid two-backtick closer. Combined with the edge-space 12 * strip rule, you can embed backticks right at the boundaries: the 13 * input `` `foo` `` renders as <code>`foo`</code>. 14 * 15 * Extends GfmBacktickSingle to inherit handle() and normalizeBody; 16 * only the delimiter length and the body character class differ. 17 * Sort and category match the parent so the two modes share one 18 * precedence slot — the (?<!`)...(?!`) guards on both mean the n=1 19 * and n=2 patterns never steal each other's input regardless of 20 * registration order. 21 * 22 * @see GfmBacktickSingle 23 */ 24class GfmBacktickDouble extends GfmBacktickSingle 25{ 26 /** @inheritdoc */ 27 protected function getModeName(): string 28 { 29 return 'gfm_backtick_double'; 30 } 31 32 /** 33 * Delimiter: exactly two backticks, guarded against longer runs. 34 */ 35 protected function getDelimiterPattern(): string 36 { 37 return '(?<!`)``(?!`)'; 38 } 39 40 /** 41 * Span body. Admits a lone backtick (one that isn't followed by 42 * another, so not part of a run-of-two) instead of the parent's 43 * backtick runs — such a stray backtick cannot form a valid n=2 44 * closer. Deterministic and possessive like the parent's body. 45 */ 46 protected function getBodyPattern(): string 47 { 48 return '(?:[^`\n]++|' . self::NOT_AT_PARA_BREAK . '\n|`(?!`))++'; 49 } 50} 51