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174 lines
5.5 KiB
PHP
174 lines
5.5 KiB
PHP
<?php
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namespace Psalm\Tests\Config\Plugin\Hook;
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use Psalm\Codebase;
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use Psalm\Plugin\DynamicFunctionStorage;
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use Psalm\Plugin\DynamicTemplateProvider;
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use Psalm\Plugin\EventHandler\DynamicFunctionStorageProviderInterface;
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use Psalm\Plugin\EventHandler\Event\DynamicFunctionStorageProviderEvent;
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use Psalm\Storage\FunctionLikeParameter;
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use Psalm\Type;
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use Psalm\Type\Atomic\TCallable;
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use Psalm\Type\Atomic\TTemplateParam;
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use Psalm\Type\Union;
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use function array_keys;
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use function array_map;
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use function count;
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class CustomArrayMapFunctionStorageProvider implements DynamicFunctionStorageProviderInterface
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{
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public static function getFunctionIds(): array
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{
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return ['custom_array_map'];
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}
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public static function getFunctionStorage(DynamicFunctionStorageProviderEvent $event): ?DynamicFunctionStorage
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{
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$template_provider = $event->getTemplateProvider();
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$arg_type_inferer = $event->getArgTypeInferer();
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$call_args = $event->getArgs();
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$args_count = count($call_args);
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$expected_callable_args_count = $args_count - 1;
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if ($expected_callable_args_count < 1) {
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return null;
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}
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$last_arg = $call_args[$args_count - 1];
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if (!($input_array_type = $arg_type_inferer->infer($last_arg)) ||
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!($input_value_type = self::toValueType($event->getCodebase(), $input_array_type))
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) {
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return null;
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}
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$all_expected_callables = [
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self::createExpectedCallable($input_value_type, $template_provider),
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...self::createRestCallables($template_provider, $expected_callable_args_count),
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];
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$custom_array_map_storage = new DynamicFunctionStorage();
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$custom_array_map_storage->templates = self::createTemplates($template_provider, $expected_callable_args_count);
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$custom_array_map_storage->return_type = self::createReturnType($all_expected_callables);
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$custom_array_map_storage->params = [
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...array_map(
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function (TCallable $expected, int $offset) {
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$t = new Union([$expected]);
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$param = new FunctionLikeParameter('fn' . $offset, false, $t, $t);
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$param->is_optional = false;
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return $param;
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},
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$all_expected_callables,
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array_keys($all_expected_callables)
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),
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self::createLastArrayMapParam($input_array_type)
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];
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return $custom_array_map_storage;
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}
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private static function createLastArrayMapParam(Union $input_array_type): FunctionLikeParameter
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{
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return new FunctionLikeParameter(
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'input',
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false,
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$input_array_type,
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$input_array_type,
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null,
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null,
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false
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);
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}
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/**
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* Resolves value type from array-like type:
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* list<int> -> int
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* list<int|string> -> int|string
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*/
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private static function toValueType(Codebase $codebase, Union $array_like_type): ?Union
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{
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$value_types = [];
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foreach ($array_like_type->getAtomicTypes() as $atomic) {
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if ($atomic instanceof Type\Atomic\TArray) {
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$value_types[] = $atomic->type_params[1];
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} elseif ($atomic instanceof Type\Atomic\TKeyedArray) {
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$value_types[] = $atomic->getGenericValueType();
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} else {
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return null;
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}
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}
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return Type::combineUnionTypeArray($value_types, $codebase);
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}
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private static function createExpectedCallable(
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Union $input_type,
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DynamicTemplateProvider $template_provider,
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int $return_template_offset = 0
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): TCallable {
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return new TCallable(
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'callable',
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[new FunctionLikeParameter('a', false, $input_type, $input_type)],
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new Union([
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$template_provider->createTemplate('T' . $return_template_offset)
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])
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);
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}
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/**
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* @return list<TCallable>
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*/
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private static function createRestCallables(
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DynamicTemplateProvider $template_provider,
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int $expected_callable_args_count
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): array {
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$rest_callable_params = [];
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for ($template_offset = 0; $template_offset < $expected_callable_args_count - 1; $template_offset++) {
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$rest_callable_params[] = self::createExpectedCallable(
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new Union([
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$template_provider->createTemplate('T' . $template_offset)
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]),
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$template_provider,
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$template_offset + 1
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);
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}
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return $rest_callable_params;
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}
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/**
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* Extracts return type for custom_array_map from last callable arg.
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*
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* @param list<TCallable> $all_expected_callables
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*/
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private static function createReturnType(array $all_expected_callables): Union
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{
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$last_callable_arg = $all_expected_callables[count($all_expected_callables) - 1];
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return Type::getList($last_callable_arg->return_type ?? Type::getMixed());
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}
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/**
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* Creates variadic template list for custom_array_map function.
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*
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* @return list<TTemplateParam>
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*/
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private static function createTemplates(
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DynamicTemplateProvider $template_provider,
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int $expected_callable_count
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): array {
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$template_params = [];
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for ($i = 0; $i < $expected_callable_count; $i++) {
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$template_params[] = $template_provider->createTemplate('T' . $i);
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}
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return $template_params;
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}
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}
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