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Align Utils::suggestionList() with the reference implementation (#1075)
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9 files changed

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9 files changed

+250
-38
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‎CHANGELOG.md

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@@ -41,6 +41,7 @@ You can find and compare releases at the [GitHub release page](https://github.co
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- Throw if `Introspection::fromSchema()` returns no data
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- Reorganize abstract class `ASTValidationContext` to interface `ValidationContext`
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- Reorganize AST interfaces related to schema and type extensions
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- Align `Utils::suggestionList()` with the reference implementation (#1075)
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### Added
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‎src/Utils/LexicalDistance.php

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@@ -0,0 +1,129 @@
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<?php declare(strict_types=1);
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namespace GraphQL\Utils;
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/**
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* Computes the lexical distance between strings A and B.
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*
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* The "distance" between two strings is given by counting the minimum number
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* of edits needed to transform string A into string B. An edit can be an
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* insertion, deletion, or substitution of a single character, or a swap of two
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* adjacent characters.
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*
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* Includes a custom alteration from Damerau-Levenshtein to treat case changes
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* as a single edit which helps identify mis-cased values with an edit distance
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* of 1.
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*
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* This distance can be useful for detecting typos in input or sorting
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*
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* Unlike the native levenshtein() function that always returns int, LexicalDistance::measure() returns int|null.
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* It takes into account the threshold and returns null if the measured distance is bigger.
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*/
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class LexicalDistance
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{
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private string $input;
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private string $inputLowerCase;
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/**
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* List of char codes in the input string.
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*
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* @var array<int>
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*/
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private array $inputArray;
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public function __construct(string $input)
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{
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$this->input = $input;
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$this->inputLowerCase = \strtolower($input);
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$this->inputArray = self::stringToArray($this->inputLowerCase);
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}
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public function measure(string $option, float $threshold): ?int
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{
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if ($this->input === $option) {
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return 0;
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}
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$optionLowerCase = \strtolower($option);
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// Any case change counts as a single edit
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if ($this->inputLowerCase === $optionLowerCase) {
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return 1;
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}
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$a = self::stringToArray($optionLowerCase);
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$b = $this->inputArray;
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if (\count($a) < \count($b)) {
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$tmp = $a;
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$a = $b;
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$b = $tmp;
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}
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$aLength = \count($a);
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$bLength = \count($b);
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if ($aLength - $bLength > $threshold) {
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return null;
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}
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/** @var array<array<int>> $rows */
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$rows = [];
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for ($i = 0; $i <= $bLength; ++$i) {
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$rows[0][$i] = $i;
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}
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for ($i = 1; $i <= $aLength; ++$i) {
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$upRow = &$rows[($i - 1) % 3];
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$currentRow = &$rows[$i % 3];
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$smallestCell = ($currentRow[0] = $i);
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for ($j = 1; $j <= $bLength; ++$j) {
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$cost = $a[$i - 1] === $b[$j - 1] ? 0 : 1;
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$currentCell = \min(
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$upRow[$j] + 1, // delete
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$currentRow[$j - 1] + 1, // insert
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$upRow[$j - 1] + $cost, // substitute
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);
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if ($i > 1 && $j > 1 && $a[$i - 1] === $b[$j - 2] && $a[$i - 2] === $b[$j - 1]) {
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// transposition
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$doubleDiagonalCell = $rows[($i - 2) % 3][$j - 2];
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$currentCell = \min($currentCell, $doubleDiagonalCell + 1);
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}
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if ($currentCell < $smallestCell) {
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$smallestCell = $currentCell;
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}
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$currentRow[$j] = $currentCell;
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}
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// Early exit, since distance can't go smaller than smallest element of the previous row.
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if ($smallestCell > $threshold) {
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return null;
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}
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}
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$distance = $rows[$aLength % 3][$bLength];
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return $distance <= $threshold ? $distance : null;
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}
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/**
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* Returns a list of char codes in the given string.
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*
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* @return array<int>
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*/
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private static function stringToArray(string $str): array
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{
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$array = [];
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foreach (\mb_str_split($str) as $char) {
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$array[] = \mb_ord($char);
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}
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return $array;
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}
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}

‎src/Utils/Utils.php

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@@ -6,7 +6,6 @@
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use function array_map;
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use function array_reduce;
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use function array_slice;
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use function asort;
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use function count;
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use function dechex;
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use function get_class;
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use function is_scalar;
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use function is_string;
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use function json_encode;
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use function levenshtein;
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use function mb_convert_encoding;
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use function mb_strlen;
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use function mb_substr;
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use function property_exists;
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use function range;
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use stdClass;
34-
use function strtolower;
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use function unpack;
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class Utils
@@ -284,34 +281,30 @@ static function ($list, $index) use ($selected, $selectedLength): string {
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* Given an invalid input string and a list of valid options, returns a filtered
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* list of valid options sorted based on their similarity with the input.
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*
287-
* Includes a custom alteration from Damerau-Levenshtein to treat case changes
288-
* as a single edit which helps identify mis-cased values with an edit distance
289-
* of 1
290-
*
291284
* @param array<string> $options
292285
*
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* @return array<int, string>
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*/
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public static function suggestionList(string $input, array $options): array
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{
290+
/** @var array<string, int> $optionsByDistance */
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$optionsByDistance = [];
292+
$lexicalDistance = new LexicalDistance($input);
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$threshold = mb_strlen($input) * 0.4 + 1;
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foreach ($options as $option) {
300-
if ($input === $option) {
301-
$distance = 0;
302-
} else {
303-
$distance = (strtolower($input) === strtolower($option)
304-
? 1
305-
: levenshtein($input, $option));
306-
}
295+
$distance = $lexicalDistance->measure($option, $threshold);
307296

308-
if ($distance <= $threshold) {
297+
if ($distance !== null) {
309298
$optionsByDistance[$option] = $distance;
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}
311300
}
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313-
asort($optionsByDistance);
302+
\uksort($optionsByDistance, static function (string $a, string $b) use ($optionsByDistance) {
303+
$distanceDiff = $optionsByDistance[$a] - $optionsByDistance[$b];
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305+
return $distanceDiff !== 0 ? $distanceDiff : \strnatcmp($a, $b);
306+
});
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315-
return array_keys($optionsByDistance);
308+
return array_map('strval', array_keys($optionsByDistance));
316309
}
317310
}

‎tests/Error/ErrorTest.php

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@@ -201,7 +201,7 @@ public function getNodes(): ?array
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self::assertEquals([1 => 2], $locatedError->getPositions());
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self::assertNotNull($locatedError->getSource());
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204-
$error = new class('msg', new NullValueNode([]), null, [], ) extends Error {
204+
$error = new class('msg', new NullValueNode([]), null, []) extends Error {
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public function getNodes(): ?array
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{
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return [new NullValueNode([])];

‎tests/Executor/DeferredFieldsTest.php

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@@ -592,10 +592,10 @@ public function testDeferredChaining(): void
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}
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');
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595-
$author1 = ['name' => 'John'/*, 'bestFriend' => ['name' => 'Dirk']*/];
596-
$author2 = ['name' => 'Jane'/*, 'bestFriend' => ['name' => 'Joe']*/];
597-
$author3 = ['name' => 'Joe'/*, 'bestFriend' => ['name' => 'Jane']*/];
598-
$author4 = ['name' => 'Dirk'/*, 'bestFriend' => ['name' => 'John']*/];
595+
$author1 = ['name' => 'John'/* , 'bestFriend' => ['name' => 'Dirk'] */];
596+
$author2 = ['name' => 'Jane'/* , 'bestFriend' => ['name' => 'Joe'] */];
597+
$author3 = ['name' => 'Joe'/* , 'bestFriend' => ['name' => 'Jane'] */];
598+
$author4 = ['name' => 'Dirk'/* , 'bestFriend' => ['name' => 'John'] */];
599599

600600
$story1 = ['title' => 'Story #8', 'author' => $author1];
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$story2 = ['title' => 'Story #3', 'author' => $author3];

‎tests/Type/EnumTypeTest.php

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@@ -348,8 +348,7 @@ public function testDoesNotAcceptValuesWithIncorrectCasing(): void
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'{ colorEnum(fromEnum: green) }',
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null,
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[
351-
// Improves upon the reference implementation
352-
'message' => 'Value "green" does not exist in "Color" enum. Did you mean the enum value "GREEN"?',
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'message' => 'Value "green" does not exist in "Color" enum. Did you mean the enum value "GREEN" or "RED"?',
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'locations' => [new SourceLocation(1, 23)],
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]
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);

‎tests/Type/ResolveInfoTest.php

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'url' => true,
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],
324324
'replies' => [
325-
'body' => true, //this would be missing if not for the fix https://github.com/webonyx/graphql-php/pull/98
325+
'body' => true, // this would be missing if not for the fix https://github.com/webonyx/graphql-php/pull/98
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'author' => [
327327
'id' => true,
328328
'name' => true,

‎tests/Utils/BreakingChangesFinderTest.php

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]);
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}
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33-
//DESCRIBE: findBreakingChanges
33+
// DESCRIBE: findBreakingChanges
3434

3535
/**
3636
* @see it('should detect if a type was removed or not')
@@ -1769,7 +1769,7 @@ public function testShouldDetectIfATypeWasAddedToAUnionType(): void
17691769
],
17701770
]);
17711771
// logially equivalent to type1; findTypesRemovedFromUnions should not
1772-
//treat this as different than type1
1772+
// treat this as different than type1
17731773
$type1a = new ObjectType([
17741774
'name' => 'Type1',
17751775
'fields' => [

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