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ExpressionParser.php
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106 lines (92 loc) · 2.4 KB
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<?php
/**
* Copyright 2016-2018 Xenofon Spafaridis
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
declare(strict_types=1);
namespace Phramework\ExpressionParser;
/**
* Expression parser
* @license https://www.apache.org/licenses/LICENSE-2.0 Apache-2.0
* @author Xenofon Spafaridis <[email protected]>
* @since 0.0.0
*/
class ExpressionParser
{
/**
* @var Language
*/
protected $language;
/**
* @var Input
*/
protected $input;
/**
* @var callable
*/
private $evaluate;
/**
* Evaluate an expression
* @param $exp
* @return callable|mixed
* @todo describe in depth
*/
public function evaluate($exp)
{
if (is_string($exp) && $this->language->isset($exp)) {
/*
* return callable
*/
return $this->language->get($exp);
}
/*
* If is literal
*/
if (!is_array($exp)) {
return $exp;
}
if ($exp[0] === 'quote') {
return $exp[1];
}
/*
* Process 'input' (dereference input)
*/
if ($exp[0] === 'input') { //is_string($exp[0]) &&
return $this->input->get($exp[1]);
}
$result = array_map(
[
$this,
'evaluate'
],
$exp
);
$function = $result[0];
$args = array_slice($result, 1);
return $function(...$args);
}
/**
* ExpressionParser constructor.
* @param Language $language
* @param Input|null $input Input could be part of the language,
* but it's ok to provide the default functionality
*/
public function __construct(
Language $language,
Input $input = null
) {
$this->language = $language;
$this->input = $input ?? new Input();
}
}