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<?php |
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/****************************************************************************** |
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* An implementation of dicto (scg.unibe.ch/dicto) in and for PHP. |
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* |
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* Copyright (c) 2016 Richard Klees <[email protected]> |
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* |
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* This software is licensed under The MIT License. You should have received |
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* a copy of the license along with the code. |
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*/ |
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namespace Lechimp\Dicto\Definition; |
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/** |
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* A symbol in known to the parser. |
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*/ |
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class Symbol { |
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/** |
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* @var string |
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*/ |
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protected $regexp; |
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/** |
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* @var int |
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*/ |
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protected $binding_power; |
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/** |
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* This defines what a token means when appearing in the initial position |
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* of an expression. |
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* |
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* @var \Closure |
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*/ |
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protected $null_denotation = null; |
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/** |
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* This defines what a token means when appearing inside an expression |
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* to the left of the rest. |
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* |
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* @var \Closure |
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*/ |
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protected $left_denotation = null; |
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public function __construct($regexp, $binding_power) { |
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assert('is_string($regexp)'); |
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if (!is_string($regexp) || @preg_match("%$regexp%", "") === false) { |
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throw new \InvalidArgumentException("Invalid regexp: '%$regexp%'"); |
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} |
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assert('is_int($binding_power)'); |
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assert('$binding_power >= 0'); |
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$this->regexp = $regexp; |
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$this->binding_power = $binding_power; |
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} |
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/** |
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* @return string |
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*/ |
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public function regexp() { |
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return $this->regexp; |
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} |
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/** |
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* @return int |
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*/ |
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public function binding_power() { |
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return $this->binding_power; |
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} |
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/** |
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* @param \Closure $led |
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* @return self |
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*/ |
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public function null_denotation_is(\Closure $led) { |
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assert('$this->null_denotation === null'); |
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$this->null_denotation = $led; |
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return $this; |
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} |
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/** |
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* @param array $matches |
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* @return mixed |
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*/ |
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public function null_denotation(array &$matches) { |
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$denotation = $this->denotation("null", $matches); |
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return $denotation($matches); |
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} |
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/** |
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* @param \Closure $led |
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* @return self |
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*/ |
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public function left_denotation_is(\Closure $led) { |
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assert('$this->left_denotation === null'); |
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$this->left_denotation = $led; |
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return $this; |
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} |
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/** |
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* @param mixed $left |
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* @param array $matches |
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* @return mixed |
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*/ |
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public function left_denotation($left, array &$matches) { |
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$denotation = $this->denotation("left", $matches); |
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return $denotation($left, $matches); |
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} |
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// HELPER |
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protected function denotation($which, array &$matches) { |
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$which = $which."_denotation"; |
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$denotation = $this->$which; |
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if ($this->$which === null) { |
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$m = $matches[0]; |
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throw new ParserException("Syntax Error: $m"); |
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} |
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return $denotation; |
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} |
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} |
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lechimp-p /
dicto.php
