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