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Add a support class to simplify typechecking list-of-objects return values
Summary: With some frequency, code wants to assert that some "$o->m()" returns a list of objects of type X, possibly with unique values for some "getKey()"-style method result. Existing checks via `PhutilTypeMap` and `assert_instances_of()` aren't quite powerful enough to do this while producing an easily understandable error state. We want to know that the error arose from a call to "$o->m()" in particular. Test Plan: Currently used elsewhere, in Piledriver code. Differential Revision: https://secure.phabricator.com/D21293
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epriestley
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commit
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2 changed files with 253 additions and 0 deletions
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@ -612,6 +612,7 @@ phutil_register_library_map(array(
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'PhutilArgumentUsageException' => 'parser/argument/exception/PhutilArgumentUsageException.php',
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'PhutilArgumentWorkflow' => 'parser/argument/workflow/PhutilArgumentWorkflow.php',
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'PhutilArray' => 'utils/PhutilArray.php',
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'PhutilArrayCheck' => 'utils/PhutilArrayCheck.php',
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'PhutilArrayTestCase' => 'utils/__tests__/PhutilArrayTestCase.php',
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'PhutilArrayWithDefaultValue' => 'utils/PhutilArrayWithDefaultValue.php',
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'PhutilAsanaFuture' => 'future/asana/PhutilAsanaFuture.php',
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@ -1619,6 +1620,7 @@ phutil_register_library_map(array(
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'ArrayAccess',
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'Iterator',
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),
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'PhutilArrayCheck' => 'Phobject',
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'PhutilArrayTestCase' => 'PhutilTestCase',
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'PhutilArrayWithDefaultValue' => 'PhutilArray',
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'PhutilAsanaFuture' => 'FutureProxy',
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251
src/utils/PhutilArrayCheck.php
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251
src/utils/PhutilArrayCheck.php
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@ -0,0 +1,251 @@
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<?php
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final class PhutilArrayCheck
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extends Phobject {
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private $instancesOf;
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private $uniqueMethod;
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private $context;
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private $object;
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private $method;
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public function setInstancesOf($instances_of) {
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$this->instancesOf = $instances_of;
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return $this;
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}
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public function getInstancesOf() {
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return $this->instancesOf;
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}
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public function setUniqueMethod($unique_method) {
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$this->uniqueMethod = $unique_method;
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return $this;
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}
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public function getUniqueMethod() {
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return $this->uniqueMethod;
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}
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public function setContext($object, $method) {
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if (!is_object($object) && !is_string($object)) {
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throw new Exception(
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pht(
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'Expected an object or string for "object" context, got "%s".',
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phutil_describe_type($object)));
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}
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if (!is_string($method)) {
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throw new Exception(
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pht(
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'Expected a string for "method" context, got "%s".',
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phutil_describe_type($method)));
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}
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$argv = func_get_args();
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$argv = array_slice($argv, 2);
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$this->context = array(
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'object' => $object,
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'method' => $method,
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'argv' => $argv,
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);
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return $this;
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}
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public function checkValues($maps) {
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foreach ($maps as $idx => $map) {
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$maps[$idx] = $this->checkValue($map);
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}
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$unique = $this->getUniqueMethod();
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if ($unique === null) {
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$result = array();
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foreach ($maps as $map) {
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foreach ($map as $value) {
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$result[] = $value;
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}
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}
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} else {
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$items = array();
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foreach ($maps as $idx => $map) {
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foreach ($map as $key => $value) {
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$items[$key][$idx] = $value;
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}
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}
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foreach ($items as $key => $values) {
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if (count($values) === 1) {
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continue;
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}
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$this->raiseValueException(
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pht(
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'Unexpected return value from calls to "%s(...)". More than one '.
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'object returned a value with unique key "%s". This key was '.
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'returned by objects with indexes: %s.',
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$unique,
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$key,
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implode(', ', array_keys($values))));
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}
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$result = array();
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foreach ($items as $key => $values) {
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$result[$key] = head($values);
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}
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}
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return $result;
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}
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public function checkValue($items) {
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if (!$this->context) {
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throw new PhutilInvalidStateException('setContext');
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}
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if (!is_array($items)) {
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$this->raiseValueException(
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pht(
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'Expected value to be a list, got "%s".',
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phutil_describe_type($items)));
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}
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$instances_of = $this->getInstancesOf();
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if ($instances_of !== null) {
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foreach ($items as $idx => $item) {
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if (!($item instanceof $instances_of)) {
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$this->raiseValueException(
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pht(
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'Expected value to be a list of objects which are instances of '.
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'"%s", but item with index "%s" is "%s".',
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$instances_of,
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$idx,
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phutil_describe_type($item)));
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}
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}
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}
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$unique = $this->getUniqueMethod();
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if ($unique !== null) {
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if ($instances_of === null) {
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foreach ($items as $idx => $item) {
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if (!is_object($item)) {
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$this->raiseValueException(
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pht(
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'Expected value to be a list of objects to support calling '.
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'"%s" to generate unique keys, but item with index "%s" is '.
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'"%s".',
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$unique,
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$idx,
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phutil_describe_type($item)));
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}
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}
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}
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$map = array();
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foreach ($items as $idx => $item) {
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$key = call_user_func(array($item, $unique));
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if (!is_string($key) && !is_int($key)) {
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$this->raiseValueException(
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pht(
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'Expected method "%s->%s()" to return a string or integer for '.
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'use as a unique key, got "%s" from object at index "%s".',
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get_class($item),
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$unique,
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phutil_describe_type($key),
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$idx));
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}
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$key = phutil_string_cast($key);
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$map[$key][$idx] = $item;
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}
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$result = array();
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foreach ($map as $key => $values) {
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if (count($values) === 1) {
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$result[$key] = head($values);
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continue;
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}
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$classes = array();
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foreach ($values as $value) {
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$classes[] = get_class($value);
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}
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$classes = array_fuse($classes);
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if (count($classes) === 1) {
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$class_display = head($classes);
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} else {
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$class_display = sprintf(
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'[%s]',
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implode(', ', $classes));
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}
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$index_display = array();
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foreach ($values as $idx => $value) {
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$index_display[] = pht(
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'"%s" (%s)',
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$idx,
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get_class($value));
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}
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$index_display = implode(', ', $index_display);
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$this->raiseValueException(
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pht(
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'Expected method "%s->%s()" to return a unique key, got "%s" '.
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'from %s object(s) at indexes: %s.',
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$class_display,
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$unique,
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$key,
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phutil_count($values),
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$index_display));
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}
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$items = $result;
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}
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return $items;
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}
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private function raiseValueException($message) {
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$context = $this->context;
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$object = $context['object'];
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$method = $context['method'];
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$argv = $context['argv'];
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if (is_object($object)) {
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$object_display = sprintf(
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'%s->%s',
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get_class($object),
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$method);
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} else {
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$object_display = sprintf(
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'%s::%s',
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$object,
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$method);
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}
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if (count($argv)) {
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$call_display = sprintf(
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'%s(...)',
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$object_display);
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} else {
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$call_display = sprintf(
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'%s()',
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$object_display);
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}
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throw new Exception(
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pht(
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'Unexpected return value from call to "%s": %s.',
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$call_display,
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$message));
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}
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}
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