refactor: put formatters into dedicated classes (#224)

Split formatting logic from Reference classes into dedicated formatter classes:
- ToolResultFormatter: Formats tool execution results into Content items
- PromptResultFormatter: Formats prompt results into PromptMessage items
- ResourceResultFormatter: Formats resource results into ResourceContents items

This refactor:
- Eliminates 122 lines of code duplication between ResourceReference and
  ResourceTemplateReference (identical formatting logic)
- Improves code organization by separating formatting concerns from
  capability reference management
- Makes formatters independently testable and reusable
- Reduces Reference classes by ~450 lines while maintaining all functionality

Changes:
- Create src/Capability/Formatter/* with three formatter classes
- Update Reference classes to delegate to formatters instead of inline logic
- Add comprehensive test coverage for all formatter classes
- All existing tests pass; no behavioral changes
This commit is contained in:
Mateu Aguiló Bosch 2026-01-18 22:17:44 +01:00 • committed by GitHub
commit ab4f686e18
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10 changed files with 727 additions and 595 deletions

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<?php
/*
* This file is part of the official PHP MCP SDK.
*
* A collaboration between Symfony and the PHP Foundation.
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Mcp\Capability\Formatter;
use Mcp\Exception\RuntimeException;
use Mcp\Schema\Content\AudioContent;
use Mcp\Schema\Content\BlobResourceContents;
use Mcp\Schema\Content\Content;
use Mcp\Schema\Content\EmbeddedResource;
use Mcp\Schema\Content\ImageContent;
use Mcp\Schema\Content\PromptMessage;
use Mcp\Schema\Content\TextContent;
use Mcp\Schema\Content\TextResourceContents;
use Mcp\Schema\Enum\Role;
/**
* @author Kyrian Obikwelu <koshnawaza@gmail.com>
* @author Mateu Aguiló Bosch <mateu@mateuaguilo.com>
*/
final class PromptResultFormatter
{
/**
* Formats the raw result of a prompt generator into an array of MCP PromptMessages.
*
* @param mixed $promptGenerationResult expected: array of message structures
*
* @return PromptMessage[] array of PromptMessage objects
*
* @throws \RuntimeException if the result cannot be formatted
* @throws \JsonException if JSON encoding fails
*/
public function format(mixed $promptGenerationResult): array
{
if ($promptGenerationResult instanceof PromptMessage) {
return [$promptGenerationResult];
}
if (!\is_array($promptGenerationResult)) {
throw new RuntimeException('Prompt generator method must return an array of messages.');
}
if (empty($promptGenerationResult)) {
return [];
}
if (\is_array($promptGenerationResult)) {
$allArePromptMessages = true;
$hasPromptMessages = false;
foreach ($promptGenerationResult as $item) {
if ($item instanceof PromptMessage) {
$hasPromptMessages = true;
} else {
$allArePromptMessages = false;
}
}
if ($allArePromptMessages && $hasPromptMessages) {
return $promptGenerationResult;
}
if ($hasPromptMessages) {
$result = [];
foreach ($promptGenerationResult as $index => $item) {
if ($item instanceof PromptMessage) {
$result[] = $item;
} else {
$result = array_merge($result, $this->format($item));
}
}
return $result;
}
if (!array_is_list($promptGenerationResult)) {
if (isset($promptGenerationResult['user']) || isset($promptGenerationResult['assistant'])) {
$result = [];
if (isset($promptGenerationResult['user'])) {
$userContent = $this->formatContent($promptGenerationResult['user']);
$result[] = new PromptMessage(Role::User, $userContent);
}
if (isset($promptGenerationResult['assistant'])) {
$assistantContent = $this->formatContent($promptGenerationResult['assistant']);
$result[] = new PromptMessage(Role::Assistant, $assistantContent);
}
return $result;
}
if (isset($promptGenerationResult['role']) && isset($promptGenerationResult['content'])) {
return [$this->formatMessage($promptGenerationResult)];
}
throw new RuntimeException('Associative array must contain either role/content keys or user/assistant keys.');
}
$formattedMessages = [];
foreach ($promptGenerationResult as $index => $message) {
if ($message instanceof PromptMessage) {
$formattedMessages[] = $message;
} else {
$formattedMessages[] = $this->formatMessage($message, $index);
}
}
return $formattedMessages;
}
throw new RuntimeException('Invalid prompt generation result format.');
}
/**
* Formats a single message into a PromptMessage.
*/
private function formatMessage(mixed $message, ?int $index = null): PromptMessage
{
$indexStr = null !== $index ? " at index {$index}" : '';
if (!\is_array($message) || !\array_key_exists('role', $message) || !\array_key_exists('content', $message)) {
throw new RuntimeException("Invalid message format{$indexStr}. Expected an array with 'role' and 'content' keys.");
}
$role = $message['role'] instanceof Role ? $message['role'] : Role::tryFrom($message['role']);
if (null === $role) {
throw new RuntimeException("Invalid role '{$message['role']}' in prompt message{$indexStr}. Only 'user' or 'assistant' are supported.");
}
$content = $this->formatContent($message['content'], $index);
return new PromptMessage($role, $content);
}
/**
* Formats content into a proper Content object.
*/
private function formatContent(mixed $content, ?int $index = null): TextContent|ImageContent|AudioContent|EmbeddedResource
{
$indexStr = null !== $index ? " at index {$index}" : '';
if ($content instanceof Content) {
if (
$content instanceof TextContent || $content instanceof ImageContent
|| $content instanceof AudioContent || $content instanceof EmbeddedResource
) {
return $content;
}
throw new RuntimeException("Invalid Content type{$indexStr}. PromptMessage only supports TextContent, ImageContent, AudioContent, or EmbeddedResource.");
}
if (\is_string($content)) {
return new TextContent($content);
}
if (\is_array($content) && isset($content['type'])) {
return $this->formatTypedContent($content, $index);
}
if (\is_scalar($content) || null === $content) {
$stringContent = null === $content ? '(null)' : (\is_bool($content) ? ($content ? 'true' : 'false') : (string) $content);
return new TextContent($stringContent);
}
$jsonContent = json_encode($content, \JSON_PRETTY_PRINT | \JSON_UNESCAPED_SLASHES | \JSON_UNESCAPED_UNICODE | \JSON_THROW_ON_ERROR);
return new TextContent($jsonContent);
}
/**
* Formats typed content arrays into Content objects.
*
* @param array<string, mixed> $content
*/
private function formatTypedContent(array $content, ?int $index = null): TextContent|ImageContent|AudioContent|EmbeddedResource
{
$indexStr = null !== $index ? " at index {$index}" : '';
$type = $content['type'];
return match ($type) {
'text' => $this->formatTextContent($content, $indexStr),
'image' => $this->formatImageContent($content, $indexStr),
'audio' => $this->formatAudioContent($content, $indexStr),
'resource' => $this->formatResourceContent($content, $indexStr),
default => throw new RuntimeException("Invalid content type '{$type}'{$indexStr}."),
};
}
/**
* @param array<string, mixed> $content
*/
private function formatTextContent(array $content, string $indexStr): TextContent
{
if (!isset($content['text']) || !\is_string($content['text'])) {
throw new RuntimeException(\sprintf('Invalid "text" content%s: Missing or invalid "text" string.', $indexStr));
}
return new TextContent($content['text']);
}
/**
* @param array<string, mixed> $content
*/
private function formatImageContent(array $content, string $indexStr): ImageContent
{
if (!isset($content['data']) || !\is_string($content['data'])) {
throw new RuntimeException("Invalid 'image' content{$indexStr}: Missing or invalid 'data' string (base64).");
}
if (!isset($content['mimeType']) || !\is_string($content['mimeType'])) {
throw new RuntimeException("Invalid 'image' content{$indexStr}: Missing or invalid 'mimeType' string.");
}
return new ImageContent($content['data'], $content['mimeType']);
}
/**
* @param array<string, mixed> $content
*/
private function formatAudioContent(array $content, string $indexStr): AudioContent
{
if (!isset($content['data']) || !\is_string($content['data'])) {
throw new RuntimeException("Invalid 'audio' content{$indexStr}: Missing or invalid 'data' string (base64).");
}
if (!isset($content['mimeType']) || !\is_string($content['mimeType'])) {
throw new RuntimeException("Invalid 'audio' content{$indexStr}: Missing or invalid 'mimeType' string.");
}
return new AudioContent($content['data'], $content['mimeType']);
}
/**
* @param array<string, mixed> $content
*/
private function formatResourceContent(array $content, string $indexStr): EmbeddedResource
{
if (!isset($content['resource']) || !\is_array($content['resource'])) {
throw new RuntimeException("Invalid 'resource' content{$indexStr}: Missing or invalid 'resource' object.");
}
$resource = $content['resource'];
if (!isset($resource['uri']) || !\is_string($resource['uri'])) {
throw new RuntimeException("Invalid resource{$indexStr}: Missing or invalid 'uri'.");
}
if (isset($resource['text']) && \is_string($resource['text'])) {
$resourceObj = new TextResourceContents($resource['uri'], $resource['mimeType'] ?? 'text/plain', $resource['text']);
} elseif (isset($resource['blob']) && \is_string($resource['blob'])) {
$resourceObj = new BlobResourceContents(
$resource['uri'],
$resource['mimeType'] ?? 'application/octet-stream',
$resource['blob']
);
} else {
throw new RuntimeException("Invalid resource{$indexStr}: Must contain 'text' or 'blob'.");
}
return new EmbeddedResource($resourceObj);
}
}

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<?php
/*
* This file is part of the official PHP MCP SDK.
*
* A collaboration between Symfony and the PHP Foundation.
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Mcp\Capability\Formatter;
use Mcp\Exception\RuntimeException;
use Mcp\Schema\Content\BlobResourceContents;
use Mcp\Schema\Content\EmbeddedResource;
use Mcp\Schema\Content\ResourceContents;
use Mcp\Schema\Content\TextResourceContents;
/**
* Formats the raw result of a resource read operation into MCP ResourceContent items.
*
* @author Kyrian Obikwelu <koshnawaza@gmail.com>
* @author Mateu Aguiló Bosch <mateu@mateuaguilo.com>
*/
final class ResourceResultFormatter
{
/**
* Formats the raw result of a resource read operation into MCP ResourceContent items.
*
* @param mixed $readResult the raw result from the resource handler method
* @param string $uri the URI of the resource that was read
* @param string|null $mimeType the MIME type from the ResourceDefinition
* @param mixed $meta optional metadata to include in the ResourceContents
*
* @return ResourceContents[] array of ResourceContents objects
*
* @throws RuntimeException If the result cannot be formatted.
*
* Supported result types:
* - ResourceContents: Used as-is
* - EmbeddedResource: Resource is extracted from the EmbeddedResource
* - string: Converted to text content with guessed or provided MIME type
* - stream resource: Read and converted to blob with provided MIME type
* - array with 'blob' key: Used as blob content
* - array with 'text' key: Used as text content
* - SplFileInfo: Read and converted to blob
* - array: Converted to JSON if MIME type is application/json or contains 'json'
* For other MIME types, will try to convert to JSON with a warning
*/
public function format(mixed $readResult, string $uri, ?string $mimeType = null, mixed $meta = null): array
{
if ($readResult instanceof ResourceContents) {
return [$readResult];
}
if ($readResult instanceof EmbeddedResource) {
return [$readResult->resource];
}
if (\is_array($readResult)) {
if (empty($readResult)) {
return [new TextResourceContents($uri, 'application/json', '[]', $meta)];
}
$allAreResourceContents = true;
$hasResourceContents = false;
$allAreEmbeddedResource = true;
$hasEmbeddedResource = false;
foreach ($readResult as $item) {
if ($item instanceof ResourceContents) {
$hasResourceContents = true;
$allAreEmbeddedResource = false;
} elseif ($item instanceof EmbeddedResource) {
$hasEmbeddedResource = true;
$allAreResourceContents = false;
} else {
$allAreResourceContents = false;
$allAreEmbeddedResource = false;
}
}
if ($allAreResourceContents && $hasResourceContents) {
return $readResult;
}
if ($allAreEmbeddedResource && $hasEmbeddedResource) {
return array_map(fn ($item) => $item->resource, $readResult);
}
if ($hasResourceContents || $hasEmbeddedResource) {
$result = [];
foreach ($readResult as $item) {
if ($item instanceof ResourceContents) {
$result[] = $item;
} elseif ($item instanceof EmbeddedResource) {
$result[] = $item->resource;
} else {
$result = array_merge($result, $this->format($item, $uri, $mimeType, $meta));
}
}
return $result;
}
}
if (\is_string($readResult)) {
$mimeType = $mimeType ?? $this->guessMimeTypeFromString($readResult);
return [new TextResourceContents($uri, $mimeType, $readResult, $meta)];
}
if (\is_resource($readResult) && 'stream' === get_resource_type($readResult)) {
$result = BlobResourceContents::fromStream(
$uri,
$readResult,
$mimeType ?? 'application/octet-stream',
$meta
);
@fclose($readResult);
return [$result];
}
if (\is_array($readResult) && isset($readResult['blob']) && \is_string($readResult['blob'])) {
$mimeType = $readResult['mimeType'] ?? $mimeType ?? 'application/octet-stream';
return [new BlobResourceContents($uri, $mimeType, $readResult['blob'], $meta)];
}
if (\is_array($readResult) && isset($readResult['text']) && \is_string($readResult['text'])) {
$mimeType = $readResult['mimeType'] ?? $mimeType ?? 'text/plain';
return [new TextResourceContents($uri, $mimeType, $readResult['text'], $meta)];
}
if ($readResult instanceof \SplFileInfo && $readResult->isFile() && $readResult->isReadable()) {
if ($mimeType && str_contains(strtolower($mimeType), 'text')) {
return [new TextResourceContents($uri, $mimeType, file_get_contents($readResult->getPathname()), $meta)];
}
return [BlobResourceContents::fromSplFileInfo($uri, $readResult, $mimeType, $meta)];
}
if (\is_array($readResult)) {
if ($mimeType && (str_contains(strtolower($mimeType), 'json')
|| 'application/json' === $mimeType)) {
try {
$jsonString = json_encode($readResult, \JSON_THROW_ON_ERROR | \JSON_PRETTY_PRINT);
return [new TextResourceContents($uri, $mimeType, $jsonString, $meta)];
} catch (\JsonException $e) {
throw new RuntimeException(\sprintf('Failed to encode array as JSON for URI "%s": %s', $uri, $e->getMessage()));
}
}
try {
$jsonString = json_encode($readResult, \JSON_THROW_ON_ERROR | \JSON_PRETTY_PRINT);
$mimeType = $mimeType ?? 'application/json';
return [new TextResourceContents($uri, $mimeType, $jsonString, $meta)];
} catch (\JsonException $e) {
throw new RuntimeException(\sprintf('Failed to encode array as JSON for URI "%s": %s', $uri, $e->getMessage()));
}
}
throw new RuntimeException(\sprintf('Cannot format resource read result for URI "%s". Handler method returned unhandled type: ', $uri).\gettype($readResult));
}
/**
* Guesses MIME type from string content (very basic).
*/
private function guessMimeTypeFromString(string $content): string
{
$trimmed = ltrim($content);
if (str_starts_with($trimmed, '<') && str_ends_with(rtrim($content), '>')) {
if (str_contains($trimmed, '<html')) {
return 'text/html';
}
if (str_contains($trimmed, '<?xml')) {
return 'application/xml';
}
return 'text/plain';
}
if (str_starts_with($trimmed, '{') && str_ends_with(rtrim($content), '}')) {
return 'application/json';
}
if (str_starts_with($trimmed, '[') && str_ends_with(rtrim($content), ']')) {
return 'application/json';
}
return 'text/plain';
}
}

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<?php
/*
* This file is part of the official PHP MCP SDK.
*
* A collaboration between Symfony and the PHP Foundation.
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Mcp\Capability\Formatter;
use Mcp\Schema\Content\Content;
use Mcp\Schema\Content\TextContent;
/**
* Formats tool execution results into MCP Content items.
*
* @author Kyrian Obikwelu <koshnawaza@gmail.com>
* @author Mateu Aguiló Bosch <mateu@mateuaguilo.com>
*/
final class ToolResultFormatter
{
/**
* Formats the result of a tool execution into an array of MCP Content items.
*
* - If the result is already a Content object, it's wrapped in an array.
* - If the result is an array:
* - If all elements are Content objects, the array is returned as is.
* - If it's a mixed array (Content and non-Content items), non-Content items are
* individually formatted (scalars to TextContent, others to JSON TextContent).
* - If it's an array with no Content items, the entire array is JSON-encoded into a single TextContent.
* - Scalars (string, int, float, bool) are wrapped in TextContent.
* - null is represented as TextContent('(null)').
* - Other objects are JSON-encoded and wrapped in TextContent.
*
* @param mixed $toolExecutionResult the raw value returned by the tool's PHP method
*
* @return Content[] the content items for CallToolResult
*
* @throws \JsonException if JSON encoding fails for non-Content array/object results
*/
public function format(mixed $toolExecutionResult): array
{
if ($toolExecutionResult instanceof Content) {
return [$toolExecutionResult];
}
if (\is_array($toolExecutionResult)) {
if (empty($toolExecutionResult)) {
return [new TextContent('[]')];
}
$allAreContent = true;
$hasContent = false;
foreach ($toolExecutionResult as $item) {
if ($item instanceof Content) {
$hasContent = true;
} else {
$allAreContent = false;
}
}
if ($allAreContent && $hasContent) {
return $toolExecutionResult;
}
if ($hasContent) {
$result = [];
foreach ($toolExecutionResult as $item) {
if ($item instanceof Content) {
$result[] = $item;
} else {
$result = array_merge($result, $this->format($item));
}
}
return $result;
}
}
if (null === $toolExecutionResult) {
return [new TextContent('(null)')];
}
if (\is_bool($toolExecutionResult)) {
return [new TextContent($toolExecutionResult ? 'true' : 'false')];
}
if (\is_scalar($toolExecutionResult)) {
return [new TextContent($toolExecutionResult)];
}
$jsonResult = json_encode(
$toolExecutionResult,
\JSON_PRETTY_PRINT | \JSON_UNESCAPED_SLASHES | \JSON_UNESCAPED_UNICODE | \JSON_THROW_ON_ERROR | \JSON_INVALID_UTF8_SUBSTITUTE
);
return [new TextContent($jsonResult)];
}
}

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namespace Mcp\Capability\Registry;
use Mcp\Exception\RuntimeException;
use Mcp\Schema\Content\AudioContent;
use Mcp\Schema\Content\BlobResourceContents;
use Mcp\Schema\Content\Content;
use Mcp\Schema\Content\EmbeddedResource;
use Mcp\Schema\Content\ImageContent;
use Mcp\Capability\Formatter\PromptResultFormatter;
use Mcp\Schema\Content\PromptMessage;
use Mcp\Schema\Content\TextContent;
use Mcp\Schema\Content\TextResourceContents;
use Mcp\Schema\Enum\Role;
use Mcp\Schema\Prompt;
/**
@ -55,228 +47,6 @@ class PromptReference extends ElementReference
*/
public function formatResult(mixed $promptGenerationResult): array
{
if ($promptGenerationResult instanceof PromptMessage) {
return [$promptGenerationResult];
}
if (!\is_array($promptGenerationResult)) {
throw new RuntimeException('Prompt generator method must return an array of messages.');
}
if (empty($promptGenerationResult)) {
return [];
}
if (\is_array($promptGenerationResult)) {
$allArePromptMessages = true;
$hasPromptMessages = false;
foreach ($promptGenerationResult as $item) {
if ($item instanceof PromptMessage) {
$hasPromptMessages = true;
} else {
$allArePromptMessages = false;
}
}
if ($allArePromptMessages && $hasPromptMessages) {
return $promptGenerationResult;
}
if ($hasPromptMessages) {
$result = [];
foreach ($promptGenerationResult as $index => $item) {
if ($item instanceof PromptMessage) {
$result[] = $item;
} else {
$result = array_merge($result, $this->formatResult($item));
}
}
return $result;
}
if (!array_is_list($promptGenerationResult)) {
if (isset($promptGenerationResult['user']) || isset($promptGenerationResult['assistant'])) {
$result = [];
if (isset($promptGenerationResult['user'])) {
$userContent = $this->formatContent($promptGenerationResult['user']);
$result[] = new PromptMessage(Role::User, $userContent);
}
if (isset($promptGenerationResult['assistant'])) {
$assistantContent = $this->formatContent($promptGenerationResult['assistant']);
$result[] = new PromptMessage(Role::Assistant, $assistantContent);
}
return $result;
}
if (isset($promptGenerationResult['role']) && isset($promptGenerationResult['content'])) {
return [$this->formatMessage($promptGenerationResult)];
}
throw new RuntimeException('Associative array must contain either role/content keys or user/assistant keys.');
}
$formattedMessages = [];
foreach ($promptGenerationResult as $index => $message) {
if ($message instanceof PromptMessage) {
$formattedMessages[] = $message;
} else {
$formattedMessages[] = $this->formatMessage($message, $index);
}
}
return $formattedMessages;
}
throw new RuntimeException('Invalid prompt generation result format.');
}
/**
* Formats a single message into a PromptMessage.
*/
private function formatMessage(mixed $message, ?int $index = null): PromptMessage
{
$indexStr = null !== $index ? " at index {$index}" : '';
if (!\is_array($message) || !\array_key_exists('role', $message) || !\array_key_exists('content', $message)) {
throw new RuntimeException("Invalid message format{$indexStr}. Expected an array with 'role' and 'content' keys.");
}
$role = $message['role'] instanceof Role ? $message['role'] : Role::tryFrom($message['role']);
if (null === $role) {
throw new RuntimeException("Invalid role '{$message['role']}' in prompt message{$indexStr}. Only 'user' or 'assistant' are supported.");
}
$content = $this->formatContent($message['content'], $index);
return new PromptMessage($role, $content);
}
/**
* Formats content into a proper Content object.
*/
private function formatContent(mixed $content, ?int $index = null): TextContent|ImageContent|AudioContent|EmbeddedResource
{
$indexStr = null !== $index ? " at index {$index}" : '';
if ($content instanceof Content) {
if (
$content instanceof TextContent || $content instanceof ImageContent
|| $content instanceof AudioContent || $content instanceof EmbeddedResource
) {
return $content;
}
throw new RuntimeException("Invalid Content type{$indexStr}. PromptMessage only supports TextContent, ImageContent, AudioContent, or EmbeddedResource.");
}
if (\is_string($content)) {
return new TextContent($content);
}
if (\is_array($content) && isset($content['type'])) {
return $this->formatTypedContent($content, $index);
}
if (\is_scalar($content) || null === $content) {
$stringContent = null === $content ? '(null)' : (\is_bool($content) ? ($content ? 'true' : 'false') : (string) $content);
return new TextContent($stringContent);
}
$jsonContent = json_encode($content, \JSON_PRETTY_PRINT | \JSON_UNESCAPED_SLASHES | \JSON_UNESCAPED_UNICODE | \JSON_THROW_ON_ERROR);
return new TextContent($jsonContent);
}
/**
* Formats typed content arrays into Content objects.
*
* @param array<string, mixed> $content
*/
private function formatTypedContent(array $content, ?int $index = null): TextContent|ImageContent|AudioContent|EmbeddedResource
{
$indexStr = null !== $index ? " at index {$index}" : '';
$type = $content['type'];
return match ($type) {
'text' => $this->formatTextContent($content, $indexStr),
'image' => $this->formatImageContent($content, $indexStr),
'audio' => $this->formatAudioContent($content, $indexStr),
'resource' => $this->formatResourceContent($content, $indexStr),
default => throw new RuntimeException("Invalid content type '{$type}'{$indexStr}."),
};
}
/**
* @param array<string, mixed> $content
*/
private function formatTextContent(array $content, string $indexStr): TextContent
{
if (!isset($content['text']) || !\is_string($content['text'])) {
throw new RuntimeException(\sprintf('Invalid "text" content%s: Missing or invalid "text" string.', $indexStr));
}
return new TextContent($content['text']);
}
/**
* @param array<string, mixed> $content
*/
private function formatImageContent(array $content, string $indexStr): ImageContent
{
if (!isset($content['data']) || !\is_string($content['data'])) {
throw new RuntimeException("Invalid 'image' content{$indexStr}: Missing or invalid 'data' string (base64).");
}
if (!isset($content['mimeType']) || !\is_string($content['mimeType'])) {
throw new RuntimeException("Invalid 'image' content{$indexStr}: Missing or invalid 'mimeType' string.");
}
return new ImageContent($content['data'], $content['mimeType']);
}
/**
* @param array<string, mixed> $content
*/
private function formatAudioContent(array $content, string $indexStr): AudioContent
{
if (!isset($content['data']) || !\is_string($content['data'])) {
throw new RuntimeException("Invalid 'audio' content{$indexStr}: Missing or invalid 'data' string (base64).");
}
if (!isset($content['mimeType']) || !\is_string($content['mimeType'])) {
throw new RuntimeException("Invalid 'audio' content{$indexStr}: Missing or invalid 'mimeType' string.");
}
return new AudioContent($content['data'], $content['mimeType']);
}
/**
* @param array<string, mixed> $content
*/
private function formatResourceContent(array $content, string $indexStr): EmbeddedResource
{
if (!isset($content['resource']) || !\is_array($content['resource'])) {
throw new RuntimeException("Invalid 'resource' content{$indexStr}: Missing or invalid 'resource' object.");
}
$resource = $content['resource'];
if (!isset($resource['uri']) || !\is_string($resource['uri'])) {
throw new RuntimeException("Invalid resource{$indexStr}: Missing or invalid 'uri'.");
}
if (isset($resource['text']) && \is_string($resource['text'])) {
$resourceObj = new TextResourceContents($resource['uri'], $resource['mimeType'] ?? 'text/plain', $resource['text']);
} elseif (isset($resource['blob']) && \is_string($resource['blob'])) {
$resourceObj = new BlobResourceContents(
$resource['uri'],
$resource['mimeType'] ?? 'application/octet-stream',
$resource['blob']
);
} else {
throw new RuntimeException("Invalid resource{$indexStr}: Must contain 'text' or 'blob'.");
}
return new EmbeddedResource($resourceObj);
return (new PromptResultFormatter())->format($promptGenerationResult);
}
}

View file

@ -11,11 +11,8 @@
namespace Mcp\Capability\Registry;
use Mcp\Exception\RuntimeException;
use Mcp\Schema\Content\BlobResourceContents;
use Mcp\Schema\Content\EmbeddedResource;
use Mcp\Capability\Formatter\ResourceResultFormatter;
use Mcp\Schema\Content\ResourceContents;
use Mcp\Schema\Content\TextResourceContents;
use Mcp\Schema\Resource;
/**
@ -45,10 +42,8 @@ class ResourceReference extends ElementReference
*
* @return ResourceContents[] array of ResourceContents objects
*
* @throws RuntimeException If the result cannot be formatted.
*
* Supported result types:
* - ResourceContent: Used as-is
* - ResourceContents: Used as-is
* - EmbeddedResource: Resource is extracted from the EmbeddedResource
* - string: Converted to text content with guessed or provided MIME type
* - stream resource: Read and converted to blob with provided MIME type
@ -60,151 +55,6 @@ class ResourceReference extends ElementReference
*/
public function formatResult(mixed $readResult, string $uri, ?string $mimeType = null): array
{
if ($readResult instanceof ResourceContents) {
return [$readResult];
}
if ($readResult instanceof EmbeddedResource) {
return [$readResult->resource];
}
$meta = $this->resource->meta;
if (\is_array($readResult)) {
if (empty($readResult)) {
return [new TextResourceContents($uri, 'application/json', '[]', $meta)];
}
$allAreResourceContents = true;
$hasResourceContents = false;
$allAreEmbeddedResource = true;
$hasEmbeddedResource = false;
foreach ($readResult as $item) {
if ($item instanceof ResourceContents) {
$hasResourceContents = true;
$allAreEmbeddedResource = false;
} elseif ($item instanceof EmbeddedResource) {
$hasEmbeddedResource = true;
$allAreResourceContents = false;
} else {
$allAreResourceContents = false;
$allAreEmbeddedResource = false;
}
}
if ($allAreResourceContents && $hasResourceContents) {
return $readResult;
}
if ($allAreEmbeddedResource && $hasEmbeddedResource) {
return array_map(fn ($item) => $item->resource, $readResult);
}
if ($hasResourceContents || $hasEmbeddedResource) {
$result = [];
foreach ($readResult as $item) {
if ($item instanceof ResourceContents) {
$result[] = $item;
} elseif ($item instanceof EmbeddedResource) {
$result[] = $item->resource;
} else {
$result = array_merge($result, $this->formatResult($item, $uri, $mimeType));
}
}
return $result;
}
}
if (\is_string($readResult)) {
$mimeType = $mimeType ?? $this->guessMimeTypeFromString($readResult);
return [new TextResourceContents($uri, $mimeType, $readResult, $meta)];
}
if (\is_resource($readResult) && 'stream' === get_resource_type($readResult)) {
$result = BlobResourceContents::fromStream(
$uri,
$readResult,
$mimeType ?? 'application/octet-stream',
$meta
);
@fclose($readResult);
return [$result];
}
if (\is_array($readResult) && isset($readResult['blob']) && \is_string($readResult['blob'])) {
$mimeType = $readResult['mimeType'] ?? $mimeType ?? 'application/octet-stream';
return [new BlobResourceContents($uri, $mimeType, $readResult['blob'], $meta)];
}
if (\is_array($readResult) && isset($readResult['text']) && \is_string($readResult['text'])) {
$mimeType = $readResult['mimeType'] ?? $mimeType ?? 'text/plain';
return [new TextResourceContents($uri, $mimeType, $readResult['text'], $meta)];
}
if ($readResult instanceof \SplFileInfo && $readResult->isFile() && $readResult->isReadable()) {
if ($mimeType && str_contains(strtolower($mimeType), 'text')) {
return [new TextResourceContents($uri, $mimeType, file_get_contents($readResult->getPathname()), $meta)];
}
return [BlobResourceContents::fromSplFileInfo($uri, $readResult, $mimeType, $meta)];
}
if (\is_array($readResult)) {
if ($mimeType && (str_contains(strtolower($mimeType), 'json')
|| 'application/json' === $mimeType)) {
try {
$jsonString = json_encode($readResult, \JSON_THROW_ON_ERROR | \JSON_PRETTY_PRINT);
return [new TextResourceContents($uri, $mimeType, $jsonString, $meta)];
} catch (\JsonException $e) {
throw new RuntimeException(\sprintf('Failed to encode array as JSON for URI "%s": %s', $uri, $e->getMessage()));
}
}
try {
$jsonString = json_encode($readResult, \JSON_THROW_ON_ERROR | \JSON_PRETTY_PRINT);
$mimeType = $mimeType ?? 'application/json';
return [new TextResourceContents($uri, $mimeType, $jsonString, $meta)];
} catch (\JsonException $e) {
throw new RuntimeException(\sprintf('Failed to encode array as JSON for URI "%s": %s', $uri, $e->getMessage()));
}
}
throw new RuntimeException(\sprintf('Cannot format resource read result for URI "%s". Handler method returned unhandled type: ', $uri).\gettype($readResult));
}
/** Guesses MIME type from string content (very basic) */
private function guessMimeTypeFromString(string $content): string
{
$trimmed = ltrim($content);
if (str_starts_with($trimmed, '<') && str_ends_with(rtrim($content), '>')) {
if (str_contains($trimmed, '<html')) {
return 'text/html';
}
if (str_contains($trimmed, '<?xml')) {
return 'application/xml';
}
return 'text/plain';
}
if (str_starts_with($trimmed, '{') && str_ends_with(rtrim($content), '}')) {
return 'application/json';
}
if (str_starts_with($trimmed, '[') && str_ends_with(rtrim($content), ']')) {
return 'application/json';
}
return 'text/plain';
return (new ResourceResultFormatter())->format($readResult, $uri, $mimeType, $this->resource->meta);
}
}

View file

@ -11,11 +11,8 @@
namespace Mcp\Capability\Registry;
use Mcp\Exception\RuntimeException;
use Mcp\Schema\Content\BlobResourceContents;
use Mcp\Schema\Content\EmbeddedResource;
use Mcp\Capability\Formatter\ResourceResultFormatter;
use Mcp\Schema\Content\ResourceContents;
use Mcp\Schema\Content\TextResourceContents;
use Mcp\Schema\ResourceTemplate;
/**
@ -78,10 +75,8 @@ class ResourceTemplateReference extends ElementReference
*
* @return array<int, ResourceContents> array of ResourceContents objects
*
* @throws \RuntimeException If the result cannot be formatted.
*
* Supported result types:
* - ResourceContent: Used as-is
* - ResourceContents: Used as-is
* - EmbeddedResource: Resource is extracted from the EmbeddedResource
* - string: Converted to text content with guessed or provided MIME type
* - stream resource: Read and converted to blob with provided MIME type
@ -93,125 +88,7 @@ class ResourceTemplateReference extends ElementReference
*/
public function formatResult(mixed $readResult, string $uri, ?string $mimeType = null): array
{
if ($readResult instanceof ResourceContents) {
return [$readResult];
}
if ($readResult instanceof EmbeddedResource) {
return [$readResult->resource];
}
$meta = $this->resourceTemplate->meta;
if (\is_array($readResult)) {
if (empty($readResult)) {
return [new TextResourceContents($uri, 'application/json', '[]', $meta)];
}
$allAreResourceContents = true;
$hasResourceContents = false;
$allAreEmbeddedResource = true;
$hasEmbeddedResource = false;
foreach ($readResult as $item) {
if ($item instanceof ResourceContents) {
$hasResourceContents = true;
$allAreEmbeddedResource = false;
} elseif ($item instanceof EmbeddedResource) {
$hasEmbeddedResource = true;
$allAreResourceContents = false;
} else {
$allAreResourceContents = false;
$allAreEmbeddedResource = false;
}
}
if ($allAreResourceContents && $hasResourceContents) {
return $readResult;
}
if ($allAreEmbeddedResource && $hasEmbeddedResource) {
return array_map(fn ($item) => $item->resource, $readResult);
}
if ($hasResourceContents || $hasEmbeddedResource) {
$result = [];
foreach ($readResult as $item) {
if ($item instanceof ResourceContents) {
$result[] = $item;
} elseif ($item instanceof EmbeddedResource) {
$result[] = $item->resource;
} else {
$result = array_merge($result, $this->formatResult($item, $uri, $mimeType));
}
}
return $result;
}
}
if (\is_string($readResult)) {
$mimeType = $mimeType ?? $this->guessMimeTypeFromString($readResult);
return [new TextResourceContents($uri, $mimeType, $readResult, $meta)];
}
if (\is_resource($readResult) && 'stream' === get_resource_type($readResult)) {
$result = BlobResourceContents::fromStream(
$uri,
$readResult,
$mimeType ?? 'application/octet-stream',
$meta
);
@fclose($readResult);
return [$result];
}
if (\is_array($readResult) && isset($readResult['blob']) && \is_string($readResult['blob'])) {
$mimeType = $readResult['mimeType'] ?? $mimeType ?? 'application/octet-stream';
return [new BlobResourceContents($uri, $mimeType, $readResult['blob'], $meta)];
}
if (\is_array($readResult) && isset($readResult['text']) && \is_string($readResult['text'])) {
$mimeType = $readResult['mimeType'] ?? $mimeType ?? 'text/plain';
return [new TextResourceContents($uri, $mimeType, $readResult['text'], $meta)];
}
if ($readResult instanceof \SplFileInfo && $readResult->isFile() && $readResult->isReadable()) {
if ($mimeType && str_contains(strtolower($mimeType), 'text')) {
return [new TextResourceContents($uri, $mimeType, file_get_contents($readResult->getPathname()), $meta)];
}
return [BlobResourceContents::fromSplFileInfo($uri, $readResult, $mimeType, $meta)];
}
if (\is_array($readResult)) {
if ($mimeType && (str_contains(strtolower($mimeType), 'json')
|| 'application/json' === $mimeType)) {
try {
$jsonString = json_encode($readResult, \JSON_THROW_ON_ERROR | \JSON_PRETTY_PRINT);
return [new TextResourceContents($uri, $mimeType, $jsonString, $meta)];
} catch (\JsonException $e) {
throw new RuntimeException("Failed to encode array as JSON for URI '{$uri}': {$e->getMessage()}");
}
}
try {
$jsonString = json_encode($readResult, \JSON_THROW_ON_ERROR | \JSON_PRETTY_PRINT);
$mimeType = $mimeType ?? 'application/json';
return [new TextResourceContents($uri, $mimeType, $jsonString, $meta)];
} catch (\JsonException $e) {
throw new RuntimeException("Failed to encode array as JSON for URI '{$uri}': {$e->getMessage()}");
}
}
throw new RuntimeException("Cannot format resource read result for URI '{$uri}'. Handler method returned unhandled type: ".\gettype($readResult));
return (new ResourceResultFormatter())->format($readResult, $uri, $mimeType, $this->resourceTemplate->meta);
}
private function compileTemplate(): void
@ -233,31 +110,4 @@ class ResourceTemplateReference extends ElementReference
$this->uriTemplateRegex = '#^'.implode('', $regexParts).'$#';
}
/** Guesses MIME type from string content (very basic) */
private function guessMimeTypeFromString(string $content): string
{
$trimmed = ltrim($content);
if (str_starts_with($trimmed, '<') && str_ends_with(rtrim($content), '>')) {
if (str_contains($trimmed, '<html')) {
return 'text/html';
}
if (str_contains($trimmed, '<?xml')) {
return 'application/xml';
}
return 'text/plain';
}
if (str_starts_with($trimmed, '{') && str_ends_with(rtrim($content), '}')) {
return 'application/json';
}
if (str_starts_with($trimmed, '[') && str_ends_with(rtrim($content), ']')) {
return 'application/json';
}
return 'text/plain';
}
}

View file

@ -11,8 +11,8 @@
namespace Mcp\Capability\Registry;
use Mcp\Capability\Formatter\ToolResultFormatter;
use Mcp\Schema\Content\Content;
use Mcp\Schema\Content\TextContent;
use Mcp\Schema\Tool;
/**
@ -54,62 +54,7 @@ class ToolReference extends ElementReference
*/
public function formatResult(mixed $toolExecutionResult): array
{
if ($toolExecutionResult instanceof Content) {
return [$toolExecutionResult];
}
if (\is_array($toolExecutionResult)) {
if (empty($toolExecutionResult)) {
return [new TextContent('[]')];
}
$allAreContent = true;
$hasContent = false;
foreach ($toolExecutionResult as $item) {
if ($item instanceof Content) {
$hasContent = true;
} else {
$allAreContent = false;
}
}
if ($allAreContent && $hasContent) {
return $toolExecutionResult;
}
if ($hasContent) {
$result = [];
foreach ($toolExecutionResult as $item) {
if ($item instanceof Content) {
$result[] = $item;
} else {
$result = array_merge($result, $this->formatResult($item));
}
}
return $result;
}
}
if (null === $toolExecutionResult) {
return [new TextContent('(null)')];
}
if (\is_bool($toolExecutionResult)) {
return [new TextContent($toolExecutionResult ? 'true' : 'false')];
}
if (\is_scalar($toolExecutionResult)) {
return [new TextContent($toolExecutionResult)];
}
$jsonResult = json_encode(
$toolExecutionResult,
\JSON_PRETTY_PRINT | \JSON_UNESCAPED_SLASHES | \JSON_UNESCAPED_UNICODE | \JSON_THROW_ON_ERROR | \JSON_INVALID_UTF8_SUBSTITUTE
);
return [new TextContent($jsonResult)];
return (new ToolResultFormatter())->format($toolExecutionResult);
}
/**

View file

@ -0,0 +1,49 @@
<?php
/*
* This file is part of the official PHP MCP SDK.
*
* A collaboration between Symfony and the PHP Foundation.
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Mcp\Tests\Unit\Capability\Formatter;
use Mcp\Capability\Formatter\PromptResultFormatter;
use Mcp\Schema\Content\PromptMessage;
use Mcp\Schema\Content\TextContent;
use Mcp\Schema\Enum\Role;
use PHPUnit\Framework\TestCase;
class PromptResultFormatterTest extends TestCase
{
public function testFormatPromptMessage(): void
{
$message = new PromptMessage(Role::User, new TextContent('hello'));
$result = (new PromptResultFormatter())->format($message);
$this->assertCount(1, $result);
$this->assertSame($message, $result[0]);
}
public function testFormatUserAssistantShorthand(): void
{
$result = (new PromptResultFormatter())->format([
'user' => 'Hello',
'assistant' => 'Hi there',
]);
$this->assertCount(2, $result);
$this->assertSame(Role::User, $result[0]->role);
$this->assertSame(Role::Assistant, $result[1]->role);
}
public function testFormatRoleContentArray(): void
{
$result = (new PromptResultFormatter())->format([
['role' => 'user', 'content' => 'Hello'],
]);
$this->assertCount(1, $result);
$this->assertSame(Role::User, $result[0]->role);
}
}

View file

@ -0,0 +1,40 @@
<?php
/*
* This file is part of the official PHP MCP SDK.
*
* A collaboration between Symfony and the PHP Foundation.
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Mcp\Tests\Unit\Capability\Formatter;
use Mcp\Capability\Formatter\ResourceResultFormatter;
use Mcp\Schema\Content\TextResourceContents;
use PHPUnit\Framework\TestCase;
class ResourceResultFormatterTest extends TestCase
{
public function testFormatStringResult(): void
{
$result = (new ResourceResultFormatter())->format('content', 'file://test');
$this->assertCount(1, $result);
$this->assertInstanceOf(TextResourceContents::class, $result[0]);
}
public function testFormatResourceContents(): void
{
$contents = new TextResourceContents('file://test', 'text/plain', 'content');
$result = (new ResourceResultFormatter())->format($contents, 'file://test');
$this->assertSame([$contents], $result);
}
public function testFormatWithMimeType(): void
{
$result = (new ResourceResultFormatter())->format('content', 'file://test', 'text/html');
$this->assertCount(1, $result);
$this->assertSame('text/html', $result[0]->mimeType);
}
}

View file

@ -0,0 +1,58 @@
<?php
/*
* This file is part of the official PHP MCP SDK.
*
* A collaboration between Symfony and the PHP Foundation.
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Mcp\Tests\Unit\Capability\Formatter;
use Mcp\Capability\Formatter\ToolResultFormatter;
use Mcp\Schema\Content\TextContent;
use PHPUnit\Framework\TestCase;
class ToolResultFormatterTest extends TestCase
{
public function testFormatStringResult(): void
{
$result = (new ToolResultFormatter())->format('hello');
$this->assertCount(1, $result);
$this->assertInstanceOf(TextContent::class, $result[0]);
$this->assertSame('hello', $result[0]->text);
}
public function testFormatContentResult(): void
{
$content = new TextContent('test');
$result = (new ToolResultFormatter())->format($content);
$this->assertSame([$content], $result);
}
public function testFormatArrayResult(): void
{
$result = (new ToolResultFormatter())->format(['key' => 'value']);
$this->assertCount(1, $result);
$this->assertInstanceOf(TextContent::class, $result[0]);
$this->assertStringContainsString('value', $result[0]->text);
}
public function testFormatNullResult(): void
{
$result = (new ToolResultFormatter())->format(null);
$this->assertCount(1, $result);
$this->assertInstanceOf(TextContent::class, $result[0]);
$this->assertSame('(null)', $result[0]->text);
}
public function testFormatBoolResult(): void
{
$result = (new ToolResultFormatter())->format(true);
$this->assertCount(1, $result);
$this->assertInstanceOf(TextContent::class, $result[0]);
$this->assertSame('true', $result[0]->text);
}
}