/**
* parse input string
* @param string input source
* @return ParseNode
*/
static function parse_string($s)
{
if ($s == '') {
throw new Exception('Cannot parse empty string');
}
// instantiate self
$Parser = new BNFParser();
// perform external tokenizing on string input
$tokens = bnf_tokenize($s);
return $Parser->parse($tokens);
}
/**
* Build JParser
*/
require dirname($argv[0]) . '/../../plugcli.php';
import('PLUG.time.Timer');
import('PLUG.parsing.*');
import('PLUG.parsing.LR.*');
import('PLUG.parsing.bnf.*');
$lexname = 'JLexBase';
$grammarname = 'JGrammar';
$tablename = 'JParseTable';
$commentData = array('author' => 'Tim Whitlock', 'category' => 'PLUG', 'package' => 'JavaScript', 'version' => '$Id' . '$');
$Timer = new Timer();
$classdir = PLUG_HOST_DIR . '/PLUG/JavaScript';
$bnfpath = $classdir . '/dev/ecma_262.bnf';
$Tree = BNFParser::parse_file($bnfpath);
// Make Lex object
$Lex = $Tree->make_lex();
$Lex->dump();
echo "----------\n";
// Make Grammar object
$rawgrammar = $Tree->evaluate();
$Grammar = GrammarBuilder::make($rawgrammar);
// Load special rules
$Grammar->exclude_terminal(J_EXPR_STATEMENT, '{');
$Grammar->exclude_terminal(J_EXPR_STATEMENT, J_FUNCTION);
// trash dummy rules that we used just to get redundant terminals into the Lex
$Grammar->remove_rules(J_RESERVED);
$Grammar->remove_rules(J_IGNORE);
$Grammar->dump($Lex);
echo "----------\n";