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<?php
namespace YOOtheme\GraphQL;
use YOOtheme\GraphQL\Error\InvariantViolation;
use YOOtheme\GraphQL\Executor\Executor;
use YOOtheme\GraphQL\Executor\Values;
use YOOtheme\GraphQL\Language\AST\NodeList;
use YOOtheme\GraphQL\Language\Parser;
use YOOtheme\GraphQL\Type\Definition\Directive;
use YOOtheme\GraphQL\Type\Definition\InputObjectType;
use YOOtheme\GraphQL\Type\Definition\ObjectType;
use YOOtheme\GraphQL\Type\Definition\ResolveInfo;
use YOOtheme\GraphQL\Type\Definition\Type;
use YOOtheme\GraphQL\Type\Schema;
use YOOtheme\GraphQL\Utils\ASTHelper;
use YOOtheme\GraphQL\Utils\BuildSchema;
use YOOtheme\GraphQL\Utils\Middleware;
class SchemaBuilder
{
/**
* @var callable[][]
*/
protected $hooks = [];
/**
* @var Type[]
*/
protected $types = [];
/**
* @var Type[]
*/
protected $loadedTypes = [];
/**
* @var array
*/
protected $directives = [];
/**
* Constructor.
*
* @param array $plugins
*/
public function __construct(array $plugins = [])
{
$this->hooks = [
'onLoad' => [],
'onLoadType' => [],
'onLoadField' => [],
];
foreach ($plugins as $plugin) {
$this->loadPlugin($plugin);
}
foreach ($this->hooks['onLoad'] as $hook) {
$hook($this);
}
}
/**
* @param string $file
* @param string $cache
*
* @return Schema
*/
public function loadSchema($file, $cache = null)
{
if (is_file($cache) && filectime($cache) > filectime($file)) {
$document = ASTHelper::fromArray(require $cache);
} else {
$document = Parser::parse(file_get_contents($file));
if ($cache) {
file_put_contents(
$cache,
"<?php\n\nreturn {$this->exportValue(ASTHelper::toArray($document))};"
);
}
}
return BuildSchema::build($document, function (array $config) {
return ['resolveField' => [$this, 'resolveField']] + $config;
});
}
/**
* @param array $config
*
* @return Schema
*/
public function buildSchema(array $config = [])
{
$config = array_replace_recursive(
[
'query' => 'Query',
'mutation' => 'Mutation',
'subscription' => 'Subscription',
'directives' => $this->directives,
'typeLoader' => [$this, 'getType'],
],
$config
);
if (is_string($config['query'])) {
$config['query'] = $this->getType($config['query']);
}
if (is_string($config['mutation'])) {
$config['mutation'] = $this->getType($config['mutation']);
}
if (is_string($config['subscription'])) {
$config['subscription'] = $this->getType($config['subscription']);
}
return new Schema($config);
}
/**
* @param array $config
*
* @return string
*/
public function printSchema(array $config = [])
{
return SchemaPrinter::doPrint($this->buildSchema($config));
}
/**
* @param string $name
*
* @return Directive
*/
public function getDirective($name)
{
return isset($this->directives[$name]) ? $this->directives[$name] : null;
}
/**
* @param Directive $directive
*/
public function setDirective(Directive $directive)
{
$this->directives[$directive->name] = $directive;
}
/**
* @param string $name
*
* @return Type|void
*/
public function getType($name)
{
if (empty($this->loadedTypes)) {
$this->loadedTypes = Type::getInternalTypes();
}
if (isset($this->loadedTypes[$name])) {
return $this->loadedTypes[$name];
}
if (isset($this->types[$name])) {
return $this->loadType($this->loadedTypes[$name] = $this->types[$name]);
}
}
/**
* @param Type $type
*/
public function setType(Type $type)
{
$this->types[$type->name] = $type;
}
/**
* @param array|callable $config
*
* @return ObjectType
*/
public function queryType($config = [])
{
return $this->objectType('Query', $config);
}
/**
* @param string $name
* @param array|callable $config
*
* @return InputObjectType
*/
public function inputType($name, $config = [])
{
$type = isset($this->types[$name])
? $this->types[$name]
: new InputObjectType([
'name' => $name,
]);
return $this->types[$name] = $this->extendType($type, $config);
}
/**
* @param string $name
* @param array|callable $config
*
* @return ObjectType
*/
public function objectType($name, $config = [])
{
$type = isset($this->types[$name])
? $this->types[$name]
: new ObjectType([
'name' => $name,
'resolveField' => [$this, 'resolveField'],
]);
return $this->types[$name] = $this->extendType($type, $config);
}
/**
* @param Type $type
* @param array|callable $config
*
* @return Type
*/
public function extendType(Type $type, $config = [])
{
if (is_callable($config)) {
$config = $config($type, $this);
}
if (is_array($config)) {
$type->config = array_replace_recursive($type->config, $config);
}
return $type;
}
/**
* @param Type $type
*
* @return Type
*/
public function loadType(Type $type)
{
foreach ($this->hooks['onLoadType'] as $hook) {
$hook($type, $this);
}
if (isset($type->config['description'])) {
$type->description = $type->config['description'];
}
if (isset($type->config['resolveField'])) {
$type->resolveFieldFn = $type->config['resolveField'];
}
if (isset($type->config['fields'])) {
$type->config['fields'] = $this->loadFields($type, $type->config['fields']);
}
if ($type instanceof ObjectType) {
$type->astNode = ASTHelper::objectType($type);
} elseif ($type instanceof InputObjectType) {
$type->astNode = ASTHelper::inputType($type);
}
return $type;
}
/**
* @param mixed $value
* @param mixed $args
* @param mixed $context
* @param ResolveInfo $info
*
* @return mixed
*/
public function resolveField($value, $args, $context, ResolveInfo $info)
{
$resolver = new Middleware([Executor::class, 'defaultFieldResolver']);
foreach ($this->resolveDirectives($info) as $directiveNode) {
if (is_callable($directiveDef = $this->getDirective($directiveNode->name->value))) {
if (
is_callable(
$directive = $directiveDef(
Values::getArgumentValues(
$directiveDef,
$directiveNode,
$info->variableValues
),
$resolver
)
)
) {
$resolver->push($directive);
}
}
}
return $resolver($value, $args, $context, $info);
}
/**
* @param ResolveInfo $info
*
* @return NodeList
*/
public function resolveDirectives(ResolveInfo $info)
{
$nodes = new NodeList([]);
$field = $info->parentType->getField($info->fieldName);
// type directives
if (isset($info->parentType->astNode->directives)) {
$nodes = $nodes->merge($info->parentType->astNode->directives);
}
// field directives
if (isset($field->astNode->directives)) {
$nodes = $nodes->merge($field->astNode->directives);
}
// query field directives
foreach ($info->fieldNodes as $node) {
if ($info->fieldName === $node->name->value) {
return $nodes->merge($node->directives ?: []);
}
}
return $nodes;
}
/**
* @param Type $type
* @param array $field
*
* @return array
*/
protected function loadField(Type $type, array $field)
{
$field += ['type' => null];
if (is_string($field['type'])) {
$field['type'] = $this->getType($field['type']);
}
if (is_array($field['type'])) {
$field['type'] = $this->loadModifiers($field['type']);
}
if (empty($field['type'])) {
throw new InvariantViolation(
"Field '{$field['name']}' on '{$type->name}' does not have a Type."
);
}
return $field;
}
/**
* @param Type $type
* @param array $fields
*
* @return array
*/
protected function loadFields(Type $type, array $fields)
{
$result = [];
foreach ($fields as $name => $field) {
$field = $this->loadField(
$type,
$field + [
'name' => lcfirst($name),
'args' => [],
]
);
foreach ($field['args'] as $key => $arg) {
$field['args'][$key] = $this->loadField($type, $arg);
}
foreach ($this->hooks['onLoadField'] as $hook) {
$field = $hook($type, $field, $this);
}
$result[$name] = $field;
}
return $result;
}
/**
* @param array $type
*
* @return Type|array
*/
protected function loadModifiers(array $type)
{
if (isset($type['nonNull'])) {
if (is_string($type['nonNull'])) {
$nonNull = $this->getType($type['nonNull']);
} elseif (is_array($type['nonNull'])) {
$nonNull = $this->loadModifiers($type['nonNull']);
}
$type = Type::nonNull(isset($nonNull) ? $nonNull : Type::string());
} elseif (isset($type['listOf'])) {
if (is_string($type['listOf'])) {
$listOf = $this->getType($type['listOf']);
} elseif (is_array($type['listOf'])) {
$listOf = $this->loadModifiers($type['listOf']);
}
$type = Type::listOf(isset($listOf) ? $listOf : Type::string());
}
return $type;
}
/**
* @param mixed $plugin
*/
protected function loadPlugin($plugin)
{
foreach ($this->hooks as $method => &$hooks) {
$hook = [$plugin, $method];
if (is_callable($hook)) {
$hooks[] = $hook;
}
}
}
/**
* Export a parsable string representation of a value.
*
* @param mixed $value
* @param int $indent
*
* @return string
*/
protected function exportValue($value, $indent = 0)
{
if (is_array($value)) {
$array = [];
$assoc = array_values($value) !== $value;
$indention = str_repeat(' ', $indent);
$indentlast = $assoc ? "\n" . $indention : '';
foreach ($value as $key => $val) {
$array[] =
($assoc ? "\n " . $indention . var_export($key, true) . ' => ' : '') .
$this->exportValue($val, $indent + 1);
}
return '[' . join(', ', $array) . $indentlast . ']';
}
return var_export($value, true);
}
}