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<?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_OR_STARTS_WITH_HYPHENATED = "|=";
const EQUALS_STARTS_WITH = "^=";
public function __construct(
protected string $cssSelector,
protected string $prefix = ".//",
protected bool $htmlMode = true
) {
}
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];
$hasElement = false;
foreach($thread as $threadKey => $currentThreadItem) {
$next = isset($thread[$threadKey + 1])
? $thread[$threadKey + 1]
: false;
switch ($currentThreadItem["type"]) {
case "star":
case "element":
$xpath []= $currentThreadItem['content'];
$hasElement = true;
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, "/");
$hasElement = false;
break;
case "id":
array_push(
$xpath,
($hasElement ? '' : '*')
. "[@id='{$currentThreadItem['content']}']"
);
$hasElement = true;
break;
case "class":
// https://devhints.io/xpath#class-check
array_push(
$xpath,
($hasElement ? '' : '*')
. "[contains(concat(' ',normalize-space(@class),' '),' {$currentThreadItem['content']} ')]"
);
$hasElement = true;
break;
case "sibling":
array_push(
$xpath,
"/following-sibling::*[1]/self::"
);
$hasElement = false;
break;
case "attribute":
if(!$hasElement) {
array_push($xpath, "*");
$hasElement = true;
}
if($this->htmlMode) {
$currentThreadItem['content'] = strtolower($currentThreadItem['content']);
}
/** @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:
array_push(
$xpath,
"[contains(@{$currentThreadItem['content']},\"{$valueString}\")]"
);
break;
case self::EQUALS_CONTAINS_WORD:
array_push(
$xpath,
"["
. "contains("
. "concat(\" \",@{$currentThreadItem['content']},\" \"),"
. "concat(\" \",\"{$valueString}\",\" \")"
. ")"
. "]"
);
break;
case self::EQUALS_OR_STARTS_WITH_HYPHENATED:
array_push(
$xpath,
"["
. "@{$currentThreadItem['content']}=\"{$valueString}\" or "
. "starts-with(@{$currentThreadItem['content']}, \"{$valueString}-\")"
. "]"
);
break;
case self::EQUALS_STARTS_WITH:
array_push(
$xpath,
"[starts-with("
. "@{$currentThreadItem['content']}, \"{$valueString}\""
. ")]"
);
break;
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, "//");
$hasElement = false;
break;
}
}
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;
}
}