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<?php

namespace App\Transpiler;

use App\Exception\ParserUnexpectedTokenException;

use App\Lexer\KeywordToken\AndToken;

use App\Lexer\KeywordToken\ByToken;

use App\Lexer\KeywordToken\InToken;

use App\Lexer\KeywordToken\IsToken;

use App\Lexer\KeywordToken\NotToken;

use App\Lexer\KeywordToken\OrderToken;

use App\Lexer\KeywordToken\OrToken;

use App\Lexer\Lexer;

use App\Lexer\SimpleToken\CommaToken;

use App\Lexer\SimpleToken\DotToken;

use App\Lexer\SimpleToken\EqualToken;

use App\Lexer\SimpleToken\GreaterEqualToken;

use App\Lexer\SimpleToken\GreaterToken;

use App\Lexer\SimpleToken\LessEqualToken;

use App\Lexer\SimpleToken\LessToken;

use App\Lexer\SimpleToken\NotEqualToken;

use App\Lexer\SimpleToken\ParenLeftToken;

use App\Lexer\SimpleToken\ParenRightToken;

use App\Lexer\SimpleToken\PlusToken;

use App\Lexer\SimpleToken\StarToken;

use App\Lexer\SimpleToken\ContainToken;

use App\Lexer\TypeToken\EmptyToken;

use App\Lexer\TypeToken\FalseToken;

use App\Lexer\TypeToken\NullToken;

use App\Lexer\TypeToken\TrueToken;

use App\Lexer\TypeToken\UnexpectedToken;

use App\Parser\Node\FieldNode;

use App\Parser\Node\QueryNode;

use App\Parser\Parser;

class SuggestionManager

{

public function __construct(

protected Lexer $lexer,

protected Parser $parser,

protected FieldsCollection $fieldsCollection

) {

}

public function addSuggestions(CustomQueryState $queryState): void

{

if ($queryState->caretPos === 0) {

return;

}

// cutting initial request to the caret position

$rawQuery = mb_substr($queryState->getQuery(), 0, $queryState->caretPos);

$latestInput = null;

if (preg_match('#([\S]+)$#', $rawQuery, $matches) === 1) {

$latestInput = $matches[0];

$rawQuery = mb_substr($rawQuery, 0, -mb_strlen($latestInput));

}

try {

$tokensList = $this->lexer->analyze($rawQuery);

array_pop($tokensList);

$tokensList[] = new UnexpectedToken();

$this->parser->parse($tokensList);

} catch (ParserUnexpectedTokenException $exception) {

if ($exception->operationError !== null) {

$expectedInputStrings = $this->makeExpectedInputStrings(

$exception->operationError->expectedTokensList

);

$queryState->suggestionsList = $this->makeSuggestions($expectedInputStrings, $latestInput);

}

} catch (\Throwable $e) {

}

protected function makeSuggestions(array $stringsList, string $input = null): array

{

$suggestionsList = [];

if ($input !== null) {

foreach ($stringsList as $string) {

if ($string !== $input && mb_stripos($string, $input) === 0) {

$suggestion = [

'label' => $string,

'value' => mb_substr($string, mb_strlen($input))

];

$suggestionsList[] = $suggestion;

}

} else {

foreach ($stringsList as $string) {

$suggestion = [

'label' => $string,

'value' => $string

];

$suggestionsList[] = $suggestion;

}

return $suggestionsList;

}

protected function makeExpectedInputStrings(array $tokensList): array

{

$expectedStrings = [];

foreach ($tokensList as $tokenClass) {

switch ($tokenClass) {

case AndToken::class:

case ByToken::class:

case InToken::class:

case IsToken::class:

case NotToken::class:

case OrderToken::class:

case OrToken::class:

//case CommaToken::class:

case DotToken::class:

case EqualToken::class:

case GreaterEqualToken::class:

case GreaterToken::class:

case LessEqualToken::class:

case LessToken::class:

case NotEqualToken::class:

//case ParenLeftToken::class:

//case ParenRightToken::class:

case PlusToken::class:

case StarToken::class:

case ContainToken::class:

case EmptyToken::class:

case NullToken::class:

case FalseToken::class:

case TrueToken::class:

$expectedStrings[] = $tokenClass::LEXEME;

break;

case FieldNode::class:

$possibleFieldNames = $this->fieldsCollection->getPossibleNames();

asort($possibleFieldNames);

foreach ($this->fieldsCollection->getPossibleNames() as $fieldName) {

array_unshift($expectedStrings, $fieldName);

}

break;

}

return $expectedStrings;

}