a class for each expression type, interpret method for each type
a class and object to store state (context)
each expression class is resposible for building it's own parse tree
Example
class tag {
//ts is the current token stream
//this is a variant of partial evaluation
var $args;
function __construct( &$ts) {
while( not_class($arg = next($ts)) ) {
$this->args[] = $arg;
}
}
//evaluate the
function run( &$context) { ... }
}
//example usage
$ts = array("tag","php","design patterns");
$op = current($ts);
$prog = new $op();
$prog->run( new context() );
notes
the expression types can be possibly parametrized if their run an construct methods follow, particular 'typical' shapes
Submitted by lida (not verified) on Wed, 2009-06-10 12:04.
"class tag { //ts is the current token stream //this is a variant of partial evaluation var $args; function __construct( &$ts) { while( not_class($arg = next($ts)) ) { $this->args[] = $arg; } "
always love code
___ lida diyet zay?flama r10seoogle
"class tag { //ts is the current token stream //this is a variant of partial evaluation var $args; function __construct( &$ts) { while( not_class($arg = next($ts)) ) { $this->args[] = $arg; } "
always love code
___
lida diyet zay?flama r10seoogle