Add identifier content applicators

src/Tag/Content.php

@@ -8,6 +8,8 @@
 use TypeLang\Parser\ParserInterface as TypesParserInterface;
 use TypeLang\PHPDoc\Exception\InvalidTagException;
 use TypeLang\PHPDoc\Parser\Description\DescriptionParserInterface;
+use TypeLang\PHPDoc\Tag\Content\IdentifierApplicator;
+use TypeLang\PHPDoc\Tag\Content\OptionalIdentifierApplicator;
 use TypeLang\PHPDoc\Tag\Content\OptionalTypeParserApplicator;
 use TypeLang\PHPDoc\Tag\Content\ValueApplicator;
 use TypeLang\PHPDoc\Tag\Content\OptionalValueApplicator;
@@ -78,6 +80,25 @@ public function nextOptionalType(TypesParserInterface $parser): ?TypeStatement
         return $this->apply(new OptionalTypeParserApplicator($parser));
     }
 
+    /**
+     * @api
+     * @param non-empty-string $tag
+     * @return non-empty-string
+     */
+    public function nextIdentifier(string $tag): string
+    {
+        return $this->apply(new IdentifierApplicator($tag));
+    }
+
+    /**
+     * @api
+     * @return non-empty-string|null
+     */
+    public function nextOptionalIdentifier(): ?string
+    {
+        return $this->apply(new OptionalIdentifierApplicator());
+    }
+
     /**
      * @api
      * @param non-empty-string $tag

src/Tag/Content/IdentifierApplicator.php

@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace TypeLang\PHPDoc\Tag\Content;
+
+use TypeLang\PHPDoc\Exception\InvalidTagException;
+use TypeLang\PHPDoc\Tag\Content;
+
+/**
+ * @template-extends Applicator<non-empty-string>
+ */
+final class IdentifierApplicator extends Applicator
+{
+    private readonly OptionalIdentifierApplicator $id;
+
+    /**
+     * @param non-empty-string $tag
+     */
+    public function __construct(
+        private readonly string $tag,
+    ) {
+        $this->id = new OptionalIdentifierApplicator();
+    }
+
+    /**
+     * @return non-empty-string
+     *
+     * @throws InvalidTagException
+     */
+    public function __invoke(Content $lexer): string
+    {
+        return ($this->id)($lexer)
+            ?? throw $lexer->getTagException(\sprintf(
+                'Tag @%s contains an incorrect identifier value',
+                $this->tag,
+            ));
+    }
+}

src/Tag/Content/OptionalIdentifierApplicator.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace TypeLang\PHPDoc\Tag\Content;
+
+use TypeLang\PHPDoc\Tag\Content;
+
+/**
+ * @template-extends Applicator<non-empty-string|null>
+ */
+final class OptionalIdentifierApplicator extends Applicator
+{
+    /**
+     * @return non-empty-string|null
+     */
+    public function __invoke(Content $lexer): ?string
+    {
+        if ($lexer->value === '') {
+            return null;
+        }
+
+        \preg_match('/([a-zA-Z_\x80-\xff][a-zA-Z0-9_\x80-\xff]*)\b/u', $lexer->value, $matches);
+
+        if (\count($matches) !== 2 || $matches[1] === '') {
+            return null;
+        }
+
+        $lexer->shift(\strlen($matches[0]));
+
+        return $matches[1];
+    }
+}

src/Tag/OptionalVariableNameProviderInterface.php

@@ -15,5 +15,5 @@ interface OptionalVariableNameProviderInterface
      *
      * @return non-empty-string|null
      */
-    public function getVariable(): ?string;
+    public function getVariableName(): ?string;
 }

src/Tag/VariableNameProviderInterface.php

@@ -14,5 +14,5 @@ interface VariableNameProviderInterface extends OptionalVariableNameProviderInte
      *
      * @return non-empty-string
      */
-    public function getVariable(): string;
+    public function getVariableName(): string;
 }