<?php

class TokenSet
{
	function _fuzzyMatch(&$state)
	{
		if(!is_iterator($state))
		{
			trigger_error("[Fatal Error] State object is not that of FAArrayIterator.", E_USER_ERROR);
		}
		
		$ret = TRUE;
		
		$i = 0;
		
		$state->reset();
		while($state->next())
		{
			$token = &$state->current();
			
			if(isset($this->_loose[$i+1]) && !$state->hasNext())
			{
				$ret = FALSE;
				break;
			}
			
			if(!isset($this->_loose[$i+1]) && $state->hasNext())
			{
				$ret = FALSE;
				break;
			}
			
			if($this->_loose[$i] != FA_TOKEN && $token['type'] != $this->_loose[$i])
			{
				
				$ret = FALSE;
				break;
			}
			
			$i++;
		}
		
		$state->reset();
		
		return $ret;
	}
	
	function checkAgainstGrammar(&$state)
	{
		if(!$this->_fuzzyMatch($state))
		{
			parse_error("Expression did not match loose grammar check.");
		}
		
		
	}
}

class TokenAssignment extends TokenSet
{
	var $_strict = array(
						FA_VARIABLE,
						FA_ASSIGN,
						array(
							FA_STRING,
							FA_VARIABLE,
							FA_FUNCTION_INSTANCE,
							FA_CLASS_INSTANCE,
							FA_ARRAY,
							),
						FA_SEMICOLON,
						);
	var $_loose = array(
						FA_TOKEN,
						FA_ASSIGN,
						FA_TOKEN,
						FA_SEMICOLON,
						);
}

class TokenFunctionDefinition extends TokenSet
{
	var $_strict = array(
						FA_FUNCTION_DEFINITION,
						FA_PARENTHESIS_OPEN,
						FA_TOKEN_SET,
						FA_PARANTHESIS_CLOSE,
						FA_BRACE_OPEN,
						FA_TOKEN_SET,
						FA_BRACE_CLOSE,
						);
	var $_loose = array(
						FA_TOKEN,
						FA_PARENTHESIS_OPEN,
						FA_TOKEN,
						FA_PARANTHESIS_CLOSE,
						FA_BRACE_OPEN,
						FA_TOKEN,
						FA_BRACE_CLOSE,
						);
	var $_token_set = array(
							array(
								FA_VARIABLE,
								FA_ASSIGN,
								array(
									FA_STRING,
									FA_VARIABLE,
									FA_FUNCTION_INSTANCE,
									FA_CLASS_INSTANCE,
									FA_ARRAY,
									FA_NUMBER,
									),
								),
							array(
								FA_VARIABLE,
								),
							array(
								FA_FUNCTION_INSTANCE,
								),
							array(
								FA_CLASS_INSTANCE,
								),
							array(
								FA_STRING,
								),
							array(
								FA_NUMBER,
								),
							);
	var $_token_separator = FA_COMMA;
}

class TokenClassDefinition extends TokenSet
{
	var $_strict = array(
						FA_CLASS_DEFINITION,
						FA_BRACE_OPEN,
						FA_SCOPE_SET,
						FA_BRACE_CLOSE,
						);
	var $_loose = array(
						FA_TOKEN,
						FA_BRACE_OPEN,
						FA_TOKEN,
						FA_BRACE_CLOSE,
						);
}

class TokenArray extends TokenSet
{
	var $_strict = array(
						FA_VARIABLE,
						FA_ASSIGN,
						FA_BRACKET_OPEN,
						FA_TOKEN_SET,
						FA_BRACKET_CLOSE,
						FA_SEMICOLON,
						);
	var $_loose = array(
						FA_TOKEN,
						FA_ASSIGN,
						FA_BRACKET_OPEN,
						FA_TOKEN,
						FA_BRACKET_CLOSE,
						FA_SEMICOLON,
						);
	var $_token_set = array(
							array(
								array(
									FA_VARIABLE,
									FA_STRING,
									FA_NUMBER,
									),
								FA_ASSIGN_ARRAY_VALUE,
								array(
									FA_STRING,
									FA_VARIABLE,
									FA_FUNCTION_INSTANCE,
									FA_CLASS_INSTANCE,
									FA_ARRAY,
									FA_NUMBER,
									),
								),
							array(
								FA_VARIABLE,
								),
							array(
								FA_FUNCTION_INSTANCE,
								),
							array(
								FA_CLASS_INSTANCE,
								),
							array(
								FA_STRING,
								),
							array(
								FA_NUMBER,
								),
							);
	var $_token_separator = FA_COMMA;
}

?>