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phorge/src/infrastructure/markup/markuprule/PhutilRemarkupEvalRule.php
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PhutilRemarkupEvalRule.php
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<?php
final class PhutilRemarkupEvalRule extends PhutilRemarkupRule {
const KEY_EVAL = 'eval';
public function getPriority() {
return 50;
}
public function apply($text) {
return preg_replace_callback(
'/\${{{(.+?)}}}/',
array($this, 'newExpressionToken'),
$text);
}
public function newExpressionToken(array $matches) {
$expression = $matches[1];
if (!$this->isFlatText($expression)) {
return $matches[0];
}
$engine = $this->getEngine();
$token = $engine->storeText($expression);
$list_key = self::KEY_EVAL;
$expression_list = $engine->getTextMetadata($list_key, array());
$expression_list[] = array(
'token' => $token,
'expression' => $expression,
'original' => $matches[0],
);
$engine->setTextMetadata($list_key, $expression_list);
return $token;
}
public function didMarkupText() {
$engine = $this->getEngine();
$list_key = self::KEY_EVAL;
$expression_list = $engine->getTextMetadata($list_key, array());
foreach ($expression_list as $expression_item) {
$token = $expression_item['token'];
$expression = $expression_item['expression'];
$result = $this->evaluateExpression($expression);
if ($result === null) {
$result = $expression_item['original'];
}
$engine->overwriteStoredText($token, $result);
}
}
private function evaluateExpression($expression) {
static $string_map;
if ($string_map === null) {
$string_map = array(
'strings' => array(
'platform' => array(
'server' => array(
'name' => PlatformSymbols::getPlatformServerName(),
'path' => PlatformSymbols::getPlatformServerPath(),
),
'client' => array(
'name' => PlatformSymbols::getPlatformClientName(),
'path' => PlatformSymbols::getPlatformClientPath(),
),
),
),
);
}
$parts = explode('.', $expression);
$cursor = $string_map;
foreach ($parts as $part) {
if (isset($cursor[$part])) {
$cursor = $cursor[$part];
} else {
break;
}
}
if (is_string($cursor)) {
return $cursor;
}
return null;
}
}

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