--- /dev/null
+<?php declare(strict_types=1);
+
+namespace PhpParser;
+
+use PhpParser\Node\Name;
+use PhpParser\Node\Name\FullyQualified;
+use PhpParser\Node\Stmt;
+
+class NameContext
+{
+ /** @var null|Name Current namespace */
+ protected $namespace;
+
+ /** @var Name[][] Map of format [aliasType => [aliasName => originalName]] */
+ protected $aliases = [];
+
+ /** @var Name[][] Same as $aliases but preserving original case */
+ protected $origAliases = [];
+
+ /** @var ErrorHandler Error handler */
+ protected $errorHandler;
+
+ /**
+ * Create a name context.
+ *
+ * @param ErrorHandler $errorHandler Error handling used to report errors
+ */
+ public function __construct(ErrorHandler $errorHandler) {
+ $this->errorHandler = $errorHandler;
+ }
+
+ /**
+ * Start a new namespace.
+ *
+ * This also resets the alias table.
+ *
+ * @param Name|null $namespace Null is the global namespace
+ */
+ public function startNamespace(Name $namespace = null) {
+ $this->namespace = $namespace;
+ $this->origAliases = $this->aliases = [
+ Stmt\Use_::TYPE_NORMAL => [],
+ Stmt\Use_::TYPE_FUNCTION => [],
+ Stmt\Use_::TYPE_CONSTANT => [],
+ ];
+ }
+
+ /**
+ * Add an alias / import.
+ *
+ * @param Name $name Original name
+ * @param string $aliasName Aliased name
+ * @param int $type One of Stmt\Use_::TYPE_*
+ * @param array $errorAttrs Attributes to use to report an error
+ */
+ public function addAlias(Name $name, string $aliasName, int $type, array $errorAttrs = []) {
+ // Constant names are case sensitive, everything else case insensitive
+ if ($type === Stmt\Use_::TYPE_CONSTANT) {
+ $aliasLookupName = $aliasName;
+ } else {
+ $aliasLookupName = strtolower($aliasName);
+ }
+
+ if (isset($this->aliases[$type][$aliasLookupName])) {
+ $typeStringMap = [
+ Stmt\Use_::TYPE_NORMAL => '',
+ Stmt\Use_::TYPE_FUNCTION => 'function ',
+ Stmt\Use_::TYPE_CONSTANT => 'const ',
+ ];
+
+ $this->errorHandler->handleError(new Error(
+ sprintf(
+ 'Cannot use %s%s as %s because the name is already in use',
+ $typeStringMap[$type], $name, $aliasName
+ ),
+ $errorAttrs
+ ));
+ return;
+ }
+
+ $this->aliases[$type][$aliasLookupName] = $name;
+ $this->origAliases[$type][$aliasName] = $name;
+ }
+
+ /**
+ * Get current namespace.
+ *
+ * @return null|Name Namespace (or null if global namespace)
+ */
+ public function getNamespace() {
+ return $this->namespace;
+ }
+
+ /**
+ * Get resolved name.
+ *
+ * @param Name $name Name to resolve
+ * @param int $type One of Stmt\Use_::TYPE_{FUNCTION|CONSTANT}
+ *
+ * @return null|Name Resolved name, or null if static resolution is not possible
+ */
+ public function getResolvedName(Name $name, int $type) {
+ // don't resolve special class names
+ if ($type === Stmt\Use_::TYPE_NORMAL && $name->isSpecialClassName()) {
+ if (!$name->isUnqualified()) {
+ $this->errorHandler->handleError(new Error(
+ sprintf("'\\%s' is an invalid class name", $name->toString()),
+ $name->getAttributes()
+ ));
+ }
+ return $name;
+ }
+
+ // fully qualified names are already resolved
+ if ($name->isFullyQualified()) {
+ return $name;
+ }
+
+ // Try to resolve aliases
+ if (null !== $resolvedName = $this->resolveAlias($name, $type)) {
+ return $resolvedName;
+ }
+
+ if ($type !== Stmt\Use_::TYPE_NORMAL && $name->isUnqualified()) {
+ if (null === $this->namespace) {
+ // outside of a namespace unaliased unqualified is same as fully qualified
+ return new FullyQualified($name, $name->getAttributes());
+ }
+
+ // Cannot resolve statically
+ return null;
+ }
+
+ // if no alias exists prepend current namespace
+ return FullyQualified::concat($this->namespace, $name, $name->getAttributes());
+ }
+
+ /**
+ * Get resolved class name.
+ *
+ * @param Name $name Class ame to resolve
+ *
+ * @return Name Resolved name
+ */
+ public function getResolvedClassName(Name $name) : Name {
+ return $this->getResolvedName($name, Stmt\Use_::TYPE_NORMAL);
+ }
+
+ /**
+ * Get possible ways of writing a fully qualified name (e.g., by making use of aliases).
+ *
+ * @param string $name Fully-qualified name (without leading namespace separator)
+ * @param int $type One of Stmt\Use_::TYPE_*
+ *
+ * @return Name[] Possible representations of the name
+ */
+ public function getPossibleNames(string $name, int $type) : array {
+ $lcName = strtolower($name);
+
+ if ($type === Stmt\Use_::TYPE_NORMAL) {
+ // self, parent and static must always be unqualified
+ if ($lcName === "self" || $lcName === "parent" || $lcName === "static") {
+ return [new Name($name)];
+ }
+ }
+
+ // Collect possible ways to write this name, starting with the fully-qualified name
+ $possibleNames = [new FullyQualified($name)];
+
+ if (null !== $nsRelativeName = $this->getNamespaceRelativeName($name, $lcName, $type)) {
+ // Make sure there is no alias that makes the normally namespace-relative name
+ // into something else
+ if (null === $this->resolveAlias($nsRelativeName, $type)) {
+ $possibleNames[] = $nsRelativeName;
+ }
+ }
+
+ // Check for relevant namespace use statements
+ foreach ($this->origAliases[Stmt\Use_::TYPE_NORMAL] as $alias => $orig) {
+ $lcOrig = $orig->toLowerString();
+ if (0 === strpos($lcName, $lcOrig . '\\')) {
+ $possibleNames[] = new Name($alias . substr($name, strlen($lcOrig)));
+ }
+ }
+
+ // Check for relevant type-specific use statements
+ foreach ($this->origAliases[$type] as $alias => $orig) {
+ if ($type === Stmt\Use_::TYPE_CONSTANT) {
+ // Constants are are complicated-sensitive
+ $normalizedOrig = $this->normalizeConstName($orig->toString());
+ if ($normalizedOrig === $this->normalizeConstName($name)) {
+ $possibleNames[] = new Name($alias);
+ }
+ } else {
+ // Everything else is case-insensitive
+ if ($orig->toLowerString() === $lcName) {
+ $possibleNames[] = new Name($alias);
+ }
+ }
+ }
+
+ return $possibleNames;
+ }
+
+ /**
+ * Get shortest representation of this fully-qualified name.
+ *
+ * @param string $name Fully-qualified name (without leading namespace separator)
+ * @param int $type One of Stmt\Use_::TYPE_*
+ *
+ * @return Name Shortest representation
+ */
+ public function getShortName(string $name, int $type) : Name {
+ $possibleNames = $this->getPossibleNames($name, $type);
+
+ // Find shortest name
+ $shortestName = null;
+ $shortestLength = \INF;
+ foreach ($possibleNames as $possibleName) {
+ $length = strlen($possibleName->toCodeString());
+ if ($length < $shortestLength) {
+ $shortestName = $possibleName;
+ $shortestLength = $length;
+ }
+ }
+
+ return $shortestName;
+ }
+
+ private function resolveAlias(Name $name, $type) {
+ $firstPart = $name->getFirst();
+
+ if ($name->isQualified()) {
+ // resolve aliases for qualified names, always against class alias table
+ $checkName = strtolower($firstPart);
+ if (isset($this->aliases[Stmt\Use_::TYPE_NORMAL][$checkName])) {
+ $alias = $this->aliases[Stmt\Use_::TYPE_NORMAL][$checkName];
+ return FullyQualified::concat($alias, $name->slice(1), $name->getAttributes());
+ }
+ } elseif ($name->isUnqualified()) {
+ // constant aliases are case-sensitive, function aliases case-insensitive
+ $checkName = $type === Stmt\Use_::TYPE_CONSTANT ? $firstPart : strtolower($firstPart);
+ if (isset($this->aliases[$type][$checkName])) {
+ // resolve unqualified aliases
+ return new FullyQualified($this->aliases[$type][$checkName], $name->getAttributes());
+ }
+ }
+
+ // No applicable aliases
+ return null;
+ }
+
+ private function getNamespaceRelativeName(string $name, string $lcName, int $type) {
+ if (null === $this->namespace) {
+ return new Name($name);
+ }
+
+ if ($type === Stmt\Use_::TYPE_CONSTANT) {
+ // The constants true/false/null always resolve to the global symbols, even inside a
+ // namespace, so they may be used without qualification
+ if ($lcName === "true" || $lcName === "false" || $lcName === "null") {
+ return new Name($name);
+ }
+ }
+
+ $namespacePrefix = strtolower($this->namespace . '\\');
+ if (0 === strpos($lcName, $namespacePrefix)) {
+ return new Name(substr($name, strlen($namespacePrefix)));
+ }
+
+ return null;
+ }
+
+ private function normalizeConstName(string $name) {
+ $nsSep = strrpos($name, '\\');
+ if (false === $nsSep) {
+ return $name;
+ }
+
+ // Constants have case-insensitive namespace and case-sensitive short-name
+ $ns = substr($name, 0, $nsSep);
+ $shortName = substr($name, $nsSep + 1);
+ return strtolower($ns) . '\\' . $shortName;
+ }
+}
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