35 lines
747 B
Plaintext
35 lines
747 B
Plaintext
|
import string
|
||
|
|
import vector
|
||
|
|
import set
|
||
|
|
import symbol
|
||
|
|
|
||
|
|
obj rule (Object) {
|
||
|
|
var lhs: symbol::symbol
|
||
|
|
var rhs: vector::vector<symbol::symbol>
|
||
|
|
var position: int
|
||
|
|
var lookahead: set::set<symbol::symbol>
|
||
|
|
|
||
|
|
fun construct(): rule* {
|
||
|
|
lhs.construct()
|
||
|
|
rhs.construct()
|
||
|
|
position = 0
|
||
|
|
lookahead.construct()
|
||
|
|
}
|
||
|
|
fun copy_construct(old: rule*) {
|
||
|
|
lhs.copy_construct(&rule->lhs)
|
||
|
|
rhs.copy_construct(&rule->rhs)
|
||
|
|
position = rule->position
|
||
|
|
lookahead.copy_construct(&rule->lookahead)
|
||
|
|
}
|
||
|
|
fun operator=(other: rule) {
|
||
|
|
destruct()
|
||
|
|
copy_construct(&other)
|
||
|
|
}
|
||
|
|
fun destruct() {
|
||
|
|
lhs.destruct()
|
||
|
|
rhs.destruct()
|
||
|
|
lookahead.destruct()
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|