diff options
Diffstat (limited to 'lib/CssXPath/Translator.php')
| -rw-r--r-- | lib/CssXPath/Translator.php | 323 |
1 files changed, 323 insertions, 0 deletions
diff --git a/lib/CssXPath/Translator.php b/lib/CssXPath/Translator.php new file mode 100644 index 000000000..140909099 --- /dev/null +++ b/lib/CssXPath/Translator.php @@ -0,0 +1,323 @@ +<?php /** @noinspection HtmlDeprecatedTag */ +namespace Gt\CssXPath; + +class Translator { + const cssRegex = + '/' + . '(?P<star>\*)' + . '|(:(?P<pseudo>[\w-]*))' + . '|\(*(?P<pseudospecifier>["\']*[\w\h-]*["\']*)\)' + . '|(?P<element>[\w-]*)' + . '|(?P<child>\s*>\s*)' + . '|(#(?P<id>[\w-]*))' + . '|(\.(?P<class>[\w-]*))' + . '|(?P<sibling>\s*\+\s*)' + . "|(\[(?P<attribute>[\w-]*)((?P<attribute_equals>[=~$]+)(?P<attribute_value>(.+\[\]'?)|[^\]]+))*\])+" + . '|(?P<descendant>\s+)' + . '/'; + + const EQUALS_EXACT = "="; + const EQUALS_CONTAINS_WORD = "~="; + const EQUALS_ENDS_WITH = "$="; + const EQUALS_CONTAINS = "*="; + const EQUALS_STARTS_WITH_OR_STARTS_WITH_HYPHENATED = "|="; + const EQUALS_STARTS_WITH = "^="; + + /** @var string */ + protected $cssSelector; + /** @var string */ + protected $prefix; + + public function __construct(string $cssSelector, string $prefix = ".//") { + $this->cssSelector = $cssSelector; + $this->prefix = $prefix; + } + + public function __toString():string { + return $this->asXPath(); + } + + public function asXPath():string { + return $this->convert($this->cssSelector); + } + + protected function convert(string $css):string { + $cssArray = preg_split( + '/(["\']).*?\1(*SKIP)(*F)|,/', + $css + ); + $xPathArray = []; + + foreach($cssArray as $input) { + $output = $this->convertSingleSelector(trim($input)); + $xPathArray []= $output; + } + + return implode(" | ", $xPathArray); + } + + protected function convertSingleSelector(string $css):string { + $thread = $this->preg_match_collated(self::cssRegex, $css); + $thread = array_values($thread); + + $xpath = [$this->prefix]; + $prevType = ""; + foreach($thread as $threadKey => $currentThreadItem) { + $next = isset($thread[$threadKey + 1]) + ? $thread[$threadKey + 1] + : false; + + switch ($currentThreadItem["type"]) { + case "star": + case "element": + $xpath []= $currentThreadItem['content']; + break; + + case "pseudo": + $specifier = ""; + if ($next && $next["type"] == "pseudospecifier") { + $specifier = "{$next['content']}"; + } + + switch ($currentThreadItem["content"]) { + case "disabled": + case "checked": + case "selected": + array_push( + $xpath, + "[@{$currentThreadItem['content']}]" + ); + break; + + case "text": + array_push( + $xpath, + '[@type="text"]' + ); + break; + + case "contains": + if(empty($specifier)) { + continue 3; + } + + array_push( + $xpath, + "[contains(text(),$specifier)]" + ); + break; + + case "first-child": + $prev = count($xpath) - 1; + $xpath[$prev] = '*[1]/self::' . $xpath[$prev]; + break; + + case "nth-child": + if (empty($specifier)) { + continue 3; + } + + $prev = count($xpath) - 1; + $previous = $xpath[$prev]; + + if (substr($previous, -1, 1) === "]") { + $xpath[$prev] = str_replace( + "]", + " and position() = $specifier]", + $xpath[$prev] + ); + } + else { + array_push( + $xpath, + "[$specifier]" + ); + } + break; + case "nth-of-type": + if (empty($specifier)) { + continue 3; + } + + $prev = count($xpath) - 1; + $previous = $xpath[$prev]; + + if(substr($previous, -1, 1) === "]") { + array_push( + $xpath, + "[$specifier]" + ); + } + else { + array_push( + $xpath, + "[$specifier]" + ); + } + break; + } + break; + + case "child": + array_push($xpath, "/"); + break; + + case "id": + array_push( + $xpath, + ($prevType != "element" ? '*' : '') + . "[@id='{$currentThreadItem['content']}']" + ); + break; + + case "class": + // https://devhints.io/xpath#class-check + array_push( + $xpath, + (($prevType != "element" && $prevType != "class") ? '*' : '') + . "[contains(concat(' ',normalize-space(@class),' '),' {$currentThreadItem['content']} ')]" + ); + break; + + case "sibling": + array_push( + $xpath, + "/following-sibling::*[1]/self::" + ); + break; + + case "attribute": + if(!$prevType) { + array_push($xpath, "*"); + } + + /** @var null|array<int, array<string, string>> $detail */ + $detail = $currentThreadItem["detail"] ?? null; + $detailType = $detail[0] ?? null; + $detailValue = $detail[1] ?? null; + + if(!$detailType + || $detailType["type"] !== "attribute_equals") { + array_push( + $xpath, + "[@{$currentThreadItem['content']}]" + ); + continue 2; + } + + $valueString = trim( + $detailValue["content"], + " '\"" + ); + + $equalsType = $detailType["content"]; + switch ($equalsType) { + case self::EQUALS_EXACT: + array_push( + $xpath, + "[@{$currentThreadItem['content']}=\"{$valueString}\"]" + ); + break; + + case self::EQUALS_CONTAINS: + throw new NotYetImplementedException(); + + case self::EQUALS_CONTAINS_WORD: + array_push( + $xpath, + "[" + . "contains(" + . "concat(\" \",@{$currentThreadItem['content']},\" \")," + . "concat(\" \",\"{$valueString}\",\" \")" + . ")" + . "]" + ); + break; + + case self::EQUALS_STARTS_WITH_OR_STARTS_WITH_HYPHENATED: + throw new NotYetImplementedException(); + + case self::EQUALS_STARTS_WITH: + throw new NotYetImplementedException(); + + case self::EQUALS_ENDS_WITH: + array_push( + $xpath, + "[" + . "substring(" + . "@{$currentThreadItem['content']}," + . "string-length(@{$currentThreadItem['content']}) - " + . "string-length(\"{$valueString}\") + 1)" + . "=\"{$valueString}\"" + . "]" + ); + break; + } + break; + + case "descendant": + array_push($xpath, "//"); + break; + } + + $prevType = $currentThreadItem["type"]; + } + + return implode("", $xpath); + } + + /** @return array<int, array<string, string>> */ + protected function preg_match_collated( + string $regex, + string $string, + callable $transform = null + ):array { + preg_match_all( + $regex, + $string, + $matches, + PREG_PATTERN_ORDER + ); + + $set = []; + foreach($matches[0] as $k => $v) { + if(!empty($v)) { + $set[$k] = null; + } + } + + foreach($matches as $k => $m) { + if(is_numeric($k)) { + continue; + } + + foreach($m as $i => $match) { + if($match === "") { + continue; + } + + $toSet = null; + + if($transform) { + $toSet = $transform($k, $match); + } + else { + $toSet = ["type" => $k, "content" => $match]; + } + + if(!isset($set[$i])) { + $set[$i] = $toSet; + } + else { + if(!isset($set[$i]["detail"])) { + $set[$i]["detail"] = []; + } + + array_push($set[$i]["detail"], $toSet); + } + } + } + + return $set; + } +} |