feat: initial commit

.gitignore

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+/vendor/

composer.json

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+{
+    "name": "knplabs/json-schema",
+    "description": "PHP json-schema implementation",
+    "type": "library",
+    "license": "MIT",
+    "autoload": {
+        "psr-4": {
+            "Knplabs\\JsonSchema\\": "src/"
+        }
+    },
+    "authors": [
+        {
+            "name": "KnpLabs",
+            "email": "hello@knplabs.com"
+        }
+    ],
+    "require": {
+        "php": ">=8.0"
+    }
+}

src/Collection.php

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+<?php
+
+declare(strict_types=1);
+
+namespace KnpLabs\JsonSchema;
+
+use Exception;
+
+final class Collection
+{
+    /**
+     * @param iterable<JsonSchema<mixed>> $schemas
+     */
+    public function __construct(private iterable $schemas)
+    {
+    }
+
+    /**
+     * @template J of JsonSchema
+     *
+     * @param class-string<J> $schemaClassName
+     *
+     * @return J
+     */
+    public function get(string $schemaClassName): JsonSchema
+    {
+        foreach ($this->schemas as $schema) {
+            if (is_a($schema, $schemaClassName)) {
+                return $schema;
+            }
+        }
+
+        throw new Exception("Schema {$schemaClassName} not found.");
+    }
+}

src/CollectionSchema.php

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+<?php
+
+declare(strict_types=1);
+
+namespace KnpLabs\JsonSchema;
+
+/**
+ * @template I
+ *
+ * @phpstan-type CollectionSchemaData array<I>
+ *
+ * @extends JsonSchema<CollectionSchemaData>
+ */
+abstract class CollectionSchema extends JsonSchema
+{
+    /**
+     * @param JsonSchema<I> $itemSchema
+     */
+    public function __construct(private JsonSchema $itemSchema)
+    {
+    }
+
+    public function getExamples(): iterable
+    {
+        yield [...$this->itemSchema->getExamples()];
+    }
+
+    public function getTitle(): string
+    {
+        return sprintf('Collection<%s>', $this->itemSchema->getTitle());
+    }
+
+    protected function getUniqueItems(): ?bool
+    {
+        return null;
+    }
+
+    protected function getMinLength(): ?int
+    {
+        return null;
+    }
+
+    protected function getMaxLength(): ?int
+    {
+        return null;
+    }
+
+    protected function getRange(): ?int
+    {
+        return null;
+    }
+
+    protected function getSchema(): array
+    {
+        $schema = [
+            'type' => 'array',
+            'items' => $this->itemSchema->jsonSerialize(),
+        ];
+
+        if (null !== $uniqueItems = $this->getUniqueItems()) {
+            $schema['uniqueItems'] = $uniqueItems;
+        }
+
+        if (null !== $minLength = $this->getMinLength()) {
+            $schema['minLength'] = $minLength;
+        }
+
+        if (null !== $maxLength = $this->getMaxLength()) {
+            $schema['maxLength'] = $maxLength;
+        }
+
+        return $schema;
+    }
+}

src/EnumSchema.php

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+<?php
+
+declare(strict_types=1);
+
+namespace KnpLabs\JsonSchema;
+
+/**
+ * @template E
+ * @extends JsonSchema<E>
+ */
+abstract class EnumSchema extends JsonSchema
+{
+    public function getExamples(): iterable
+    {
+        return $this->getEnum();
+    }
+
+    protected function getSchema(): array
+    {
+        return [
+            'enum' => [...$this->getEnum()],
+        ];
+    }
+
+    /**
+     * @return iterable<int, E>
+     */
+    abstract protected function getEnum(): iterable;
+}