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File: Symbol.class.php

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  Classes of Alejandro Siri  >  PHPCC  >  Symbol.class.php  
File: Symbol.class.php
Role: Class source
Content type: text/plain
Description: Symbol
Class: PHPCC
Parse language string according to a given grammar
 

Contents

Class file image Download
<?php

class EregSymbol extends Parser {
    function EregSymbol($sym) {
        parent :: Parser();
        $bars = explode('/',$sym);
        $mods = array_pop($bars);
        array_shift($bars);
        $spaces = '[\s\t\n]*';
        $this->preg = '/^'.$spaces.'('.implode('/',$bars).')'.$spaces.'/'.$mods;
        $this->sym = $sym;
    }
    function parse($tks) {
        $spaces = '[\s\t\n]*';
        if (preg_match($this->preg, $tks->str, $matches)) {
            return array (ParseResult::match($matches[1]),new ParseInput(substr($tks->str,strlen($matches[0]))));
        } else {
            $this->setError(array((string)strlen(preg_replace('/^'.$spaces.'/','',$tks->str))=>$this->sym));
            return array (ParseResult::fail(),$tks);
        }
    }
    function print_tree() {
        return $this->sym;
    }
}

class Symbol extends EregSymbol {
    function Symbol($ss) {
        parent :: EregSymbol('/'.preg_quote($ss).'/');
        $this->sym='"'.$ss.'"';
    }
}
?>