DefinitionPrinter::printIntrospectionSchema() - Code Metrics - Inspection of "WIP: Definition printer" - digiaonline/graphql-php - Measure and Improve Code Quality continuously with Scrutinizer

Passed
Pull Request — master (#209)

by Christoffer
created 2018-04-15 11:15 UTC
DefinitionPrinter::printIntrospectionSchema() A

↳ Parent: DefinitionPrinter
Complexity

Conditions	1
Paths	1
Size

Total Lines	11
Code Lines	7
Duplication

Lines	0
Ratio	0 %
Importance

Changes
Metric	Value
cc	1
eloc	7
nc	1
nop	2
dl	0
loc	11
rs	9.4285
c	0
b	0
f	0
<?php

namespace Digia\GraphQL\Schema;

use Digia\GraphQL\Error\InvariantException;
use Digia\GraphQL\Error\PrintException;
use Digia\GraphQL\Type\Definition\DefinitionInterface;
use Digia\GraphQL\Type\Definition\DescriptionAwareInterface;
use Digia\GraphQL\Type\Definition\Directive;
use Digia\GraphQL\Type\Definition\EnumType;
use Digia\GraphQL\Type\Definition\InputObjectType;
use Digia\GraphQL\Type\Definition\InterfaceType;
use Digia\GraphQL\Type\Definition\NamedTypeInterface;
use Digia\GraphQL\Type\Definition\ObjectType;
use Digia\GraphQL\Type\Definition\ScalarType;
use Digia\GraphQL\Type\Definition\TypeInterface;
use Digia\GraphQL\Type\Definition\UnionType;
use function Digia\GraphQL\Type\isIntrospectionType;
use function Digia\GraphQL\Type\isSpecifiedScalarType;
use function Digia\GraphQL\Util\toString;

class DefinitionPrinter implements DefinitionPrinterInterface
{
    /**
     * @var array
     */
    protected $options;

    /**
     * @inheritdoc
     * @throws PrintException
     */
    public function printSchema(SchemaInterface $schema, array $options = []): string
    {
        $this->options = $options;

        return $this->printFilteredSchema(
            $schema,
            function (Directive $directive): bool {
                return !isSpecifiedDirective($directive);
            },
            function (TypeInterface $type): bool {
                return !isSpecifiedScalarType($type) && !isIntrospectionType($type);
            }
        );
    }

    /**
     * @inheritdoc
     * @throws PrintException
     */
    public function printIntrospectionSchema(SchemaInterface $schema, array $options = []): string
    {
        $this->options = $options;

        return $this->printFilteredSchema(
            $schema,
            function (Directive $directive): bool {
                return isSpecifiedDirective($directive);
            },
            function (TypeInterface $type): bool {
                return isIntrospectionType($type);
            }
        );
    }

    /**
     * @param mixed $definition
     * @return string
     * @throws PrintException
     */
    public function print(DefinitionInterface $definition): string
    {
        if ($definition instanceof Schema) {
            return $this->printSchemaDefinition($definition);
        }
        if ($definition instanceof NamedTypeInterface) {
            return $this->printType($definition);
        }

        throw new PrintException(\sprintf('Invalid definition object: %s.', toString($definition)));
    }

    /**
     * @param SchemaInterface $schema
     * @param callable        $directiveFilter
     * @param callable        $typeFilter
     * @return string
     * @throws PrintException
     */
    protected function printFilteredSchema(
        SchemaInterface $schema,
        callable $directiveFilter,
        callable $typeFilter
    ): string {
        /** @noinspection PhpParamsInspection */
        $lines = \array_filter(\array_merge(
            [$this->printOne($schema)],
            $this->printMany($this->getSchemaDirectives($schema, $directiveFilter)),
            $this->printMany($this->getSchemaTypes($schema, $typeFilter))
        ));

        return printArray($lines, "\n\n") . "\n";
    }

    /**
     * @param SchemaInterface $schema
     * @param callable        $filter
     * @return array
     */
    protected function getSchemaDirectives(SchemaInterface $schema, callable $filter): array
    {
        return \array_filter($schema->getDirectives(), $filter);
    }

    /**
     * @param SchemaInterface $schema
     * @param callable        $filter
     * @return array
     */
    protected function getSchemaTypes(SchemaInterface $schema, callable $filter): array
    {
        $types = \array_filter(\array_values($schema->getTypeMap()), $filter);

        \usort($types, function (TypeInterface $typeA, TypeInterface $typeB) {
            return \strcasecmp($typeA->getName(), $typeB->getName());
        });

        return $types;
    }

    /**
     * @param Schema $definition
     * @return string
     */
    protected function printSchemaDefinition(Schema $definition): string
    {
        if ($this->isSchemaOfCommonNames($definition)) {
            return '';
        }

        $operationTypes = [];

        if (null !== ($queryType = $definition->getQueryType())) {
            $operationTypes[] = "  query: {$queryType->getName()}";
        }

        if (null !== ($mutationType = $definition->getMutationType())) {
            $operationTypes[] = "  mutation: {$mutationType->getName()}";
        }

        if (null !== ($subscriptionType = $definition->getSubscriptionType())) {
            $operationTypes[] = "  subscription: {$subscriptionType->getName()}";
        }

        return printLines([
            'schema {\n',
              printLines($operationTypes),
            '}'
        ]);
    }

    /**
     * GraphQL schema define root types for each type of operation. These types are
     * the same as any other type and can be named in any manner, however there is
     * a common naming convention:
     *
     *   schema {
     *     query: Query
     *     mutation: Mutation
     *     subscription: Subscription
     *   }
     *
     * When using this naming convention, the schema description can be omitted.
     *
     * @param SchemaInterface $schema
     * @return bool
     */
    protected function isSchemaOfCommonNames(SchemaInterface $schema): bool
    {
        if (null !== ($queryType = $schema->getQueryType()) &&
            $queryType->getName() !== 'Query') {
            return false;
        }

        if (null !== ($mutationType = $schema->getMutationType()) &&
            $mutationType->getName() !== 'Mutation') {
            return false;
        }

        if (null !== ($subscriptionType = $schema->getSubscriptionType()) &&
            $subscriptionType->getName() !== 'Subscription') {
            return false;
        }

        return true;
    }

    /**
     * @param NamedTypeInterface $type
     * @return string
     * @throws PrintException
     */
    protected function printType(NamedTypeInterface $type): string
    {
        if ($type instanceof ScalarType) {
            return $this->printScalarType($type);
        }
        if ($type instanceof ObjectType) {
            return $this->printObjectType($type);
        }
        if ($type instanceof InterfaceType) {
            return $this->printInterfaceType($type);
            return $this->/** @scrutinizer ignore-call */ printInterfaceType($type);
        }
        if ($type instanceof UnionType) {
            return $this->printUnionType($type);
            return $this->/** @scrutinizer ignore-call */ printUnionType($type);
        }
        if ($type instanceof EnumType) {
            return $this->printEnumType($type);
            return $this->/** @scrutinizer ignore-call */ printEnumType($type);
        }
        if ($type instanceof InputObjectType) {
            return $this->printInputObjectType($type);
            return $this->/** @scrutinizer ignore-call */ printInputObjectType($type);
        }

        throw new PrintException(\sprintf('Unknown type: %s', (string)$type));
    }

    /**
     * @param ScalarType $type
     * @return string
     */
    protected function printScalarType(ScalarType $type): string
    {
        return printLines([
            $this->printDescription($type),
            "scalar {$type->getName()}"
        ]);
    }

    /**
     * @param ObjectType $type
     * @return string
     * @throws InvariantException
     */
    protected function printObjectType(ObjectType $type): string
    {
        $description = $this->printDescription($type);
        $name        = $type->getName();
        $implements  = $type->hasInterfaces()
            ? ' implements ' . printArray(\array_map(function (InterfaceType $interface) {
                return $interface->getName();
            }, $type->getInterfaces()), ' & ')
            : '';
        $fields      = $this->printMany($type->getFields());

        return printLines([
            $description,
            "type {$name}{$implements} {",
            $fields,
            '}'
        ]);
    }

    /**
     * @param NamedTypeInterface $type
     * @param string             $indentation
     * @param bool               $isFirstInBlock
     * @return string
     */
    protected function printDescription(
        NamedTypeInterface $type,
        string $indentation = '',
        bool $isFirstInBlock = true
    ): string {
        if (!($type instanceof DescriptionAwareInterface)) {
            return '';
        }

        $lines      = descriptionLines($type->getDescription(), 120 - \strlen($indentation));
        $linesCount = \count($lines);

        if (isset($this->options['commentDescriptions'])) {
            return $this->printDescriptionWithComments($lines, $indentation, $isFirstInBlock);
        }

        $description = $indentation && !$isFirstInBlock
            ? "\n" . $indentation . '"""'
            : $indentation . '"""';

        // In some circumstances, a single line can be used for the description.
        if (
            $linesCount === 1 &&
            ($firstLineLength = \strlen($lines[0])) < 70 &&
            $lines[0][$firstLineLength - 1] !== '"'
        ) {
            return $description . escapeQuote($lines[0]) . '"""' . "\n";
        }

        // Format a multi-line block quote to account for leading space.
        $hasLeadingSpace = $lines[0][0] === ' ' || $lines[0][0] === "\t";
        if (!$hasLeadingSpace) {
            $description .= "\n";
        }

        for ($i = 0; $i < $linesCount; $i++) {
            $description .= $i !== 0 || !$hasLeadingSpace
                ? $description .= $indentation
                : escapeQuote($lines[$i]) . "\n";
        }

        $description .= $indentation . '"""';

        return $description;
    }

    protected function printDescriptionWithComments(array $lines, string $indentation, bool $isFirstInBlock): string
    {
        $description = $indentation && !$isFirstInBlock ? "\n" : '';
        $linesCount  = \count($lines);

        for ($i = 0; $i < $linesCount; $i++) {
            $description .= $lines[$i] === ''
                ? $indentation . '#' . "\n"
                : $indentation . '# ' . $lines[$i] . "\n";
        }

        return $description;
    }

    /**
     * @param DefinitionInterface $definition
     * @return string
     * @throws PrintException
     */
    protected function printOne(DefinitionInterface $definition): string
    {
        return $this->print($definition);
    }

    /**
     * @param DefinitionInterface[] $definitions
     * @return array
     */
    protected function printMany(array $definitions): array
    {
        return \array_map(function ($definition) {
            return $this->print($definition);
        }, $definitions);
    }
}

digiaonline / graphql-php

Pull Request — master (#209)

DefinitionPrinter::printIntrospectionSchema() A

Complexity

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Duplication

Importance

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