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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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* The symbol table knows all symbols we could construct. |
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*/ |
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class SymbolTable { |
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/** |
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* @var Symbol[] |
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*/ |
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protected $symbols = array(); |
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/** |
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* Generator over the symbols the SymbolTable knows. |
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* |
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* @return Generator |
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*/ |
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public function symbols() { |
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foreach($this->symbols as $symbol) { |
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yield $symbol; |
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} |
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} |
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/** |
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* Add a symbol to the table. |
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* |
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* @param string $regexp |
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* @param int $binding_power |
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* @throws \InvalidArgumentException if %$regexp% is not a regexp |
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* @throws \LogicException if there already is a symbol with that $regexp. |
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* @return Symbol |
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*/ |
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public function add_symbol($regexp, $binding_power = 0) { |
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if (array_key_exists($regexp, $this->symbols)) { |
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throw new \LogicException("Symbol for regexp $regexp already exists."); |
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} |
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$s = new Symbol($regexp, $binding_power); |
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$this->symbols[$regexp] = $s; |
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return $s; |
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} |
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// HELPERS that make defining symbols a little more concise. |
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/** |
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* Add a symbol to the symbol table. |
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* |
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* @param string $regexp |
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* @param int $binding_power |
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* @throws \InvalidArgumentException if %$regexp% is not a regexp |
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* @throws \LogicException if there already is a symbol with that $regexp. |
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* @return Symbol |
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*/ |
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public function symbol($regexp, $binding_power = 0) { |
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return $this->add_symbol($regexp, $binding_power); |
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} |
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/** |
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* Add an operator to the symbol table. |
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* |
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* Convenience, will split the given string and wrap each char in [] |
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* before passing it to symbol. |
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* |
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* @param string $op |
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* @param int $binding_power |
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* @throws \InvalidArgumentException if %$regexp% is not a regexp |
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* @throws \LogicException if there already is a symbol with that $regexp. |
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* @return Symbol |
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*/ |
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public function operator($op, $binding_power = 0) { |
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$regexp = $this->operator_regexp($op); |
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return $this->symbol($regexp, $binding_power); |
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} |
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/** |
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* Add a literal to the symbol table, where the matches are |
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* transformed using the $converter. |
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* |
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* @param string $regexp |
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* @param \Closure $converter |
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* @throws \InvalidArgumentException if %$regexp% is not a regexp |
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* @throws \LogicException if there already is a symbol with that $regexp. |
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* @return Symbol |
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*/ |
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public function literal($regexp, $converter) { |
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return $this->symbol($regexp) |
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->null_denotation_is($converter); |
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} |
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/** |
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* "abc" -> "[a][b][c]" |
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* |
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* Makes handling operators like "*" easier. |
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* |
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* @param string $op |
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* @return string |
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*/ |
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public function operator_regexp($op) { |
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assert('is_string($op)'); |
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$regexp = array(); |
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foreach (str_split($op, 1) as $c) { |
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$regexp[] = "[$c]"; |
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} |
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return implode("", $regexp); |
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} |
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} |
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lechimp-p /
dicto.php
