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<?php
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/*
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 * This file is part of Psy Shell.
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 *
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 * (c) 2012-2022 Justin Hileman
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 *
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 * For the full copyright and license information, please view the LICENSE
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 * file that was distributed with this source code.
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 */
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namespace Psy\TabCompletion\Matcher;
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/**
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 * A PHP keyword tab completion Matcher.
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 *
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 * This matcher provides completion for all function-like PHP keywords.
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 *
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 * @author Marc Garcia <markcial@gmail.com>
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 */
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class KeywordsMatcher extends AbstractMatcher
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{
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    protected $keywords = [
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        'array', 'clone', 'declare', 'die', 'echo', 'empty', 'eval', 'exit', 'include',
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        'include_once', 'isset', 'list', 'print',  'require', 'require_once', 'unset',
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    ];
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    protected $mandatoryStartKeywords = [
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        'die', 'echo', 'print', 'unset',
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    ];
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    /**
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     * Get all (completable) PHP keywords.
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     *
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     * @return array
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     */
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    public function getKeywords(): array
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    {
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        return $this->keywords;
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    }
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    /**
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     * Check whether $keyword is a (completable) PHP keyword.
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     *
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     * @param string $keyword
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     *
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     * @return bool
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     */
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    public function isKeyword(string $keyword): bool
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    {
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        return \in_array($keyword, $this->keywords);
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    }
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    /**
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     * {@inheritdoc}
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     */
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    public function getMatches(array $tokens, array $info = []): array
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    {
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        $input = $this->getInput($tokens);
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        return \array_filter($this->keywords, function ($keyword) use ($input) {
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            return AbstractMatcher::startsWith($input, $keyword);
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        });
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    }
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    /**
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     * {@inheritdoc}
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     */
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    public function hasMatched(array $tokens): bool
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    {
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        $token = \array_pop($tokens);
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        $prevToken = \array_pop($tokens);
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        switch (true) {
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            case self::hasToken([self::T_OPEN_TAG, self::T_VARIABLE], $token):
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//            case is_string($token) && $token === '$':
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            case self::hasToken([self::T_OPEN_TAG, self::T_VARIABLE], $prevToken) &&
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                self::tokenIs($token, self::T_STRING):
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            case self::isOperator($token):
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                return true;
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        }
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        return false;
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    }
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}