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<?php
/******************************************************************************
* An implementation of dicto (scg.unibe.ch/dicto) in and for PHP.
*
* Copyright (c) 2016 Richard Klees <[email protected]>
* This software is licensed under The MIT License. You should have received
* a copy of the license along with the code.
*/
namespace Lechimp\Dicto\Definition;
/**
* The symbol table knows all symbols we could construct.
class SymbolTable {
* @var Symbol[]
protected $symbols = array();
* Generator over the symbols the SymbolTable knows.
* @return Generator
public function symbols() {
foreach($this->symbols as $symbol) {
yield $symbol;
}
* Add a symbol to the table.
* @param string $regexp
* @param int $binding_power
* @throws \InvalidArgumentException if %$regexp% is not a regexp
* @throws \LogicException if there already is a symbol with that $regexp.
* @return Symbol
public function add_symbol($regexp, $binding_power = 0) {
if (array_key_exists($regexp, $this->symbols)) {
throw new \LogicException("Symbol for regexp $regexp already exists.");
$s = new Symbol($regexp, $binding_power);
$this->symbols[$regexp] = $s;
return $s;
lechimp-p /
dicto.php
