import string
import vector
import set
import symbol
import regex

obj grammer (Object) {
    var rules: vector::vector<rule>
    var regexs: set::set<regex>

    fun construct(): grammer* {
        rules.construct()
        regexs.construct()
    }
    fun copy_construct(old: grammer*) {
        rules.copy_construct(&old->rules)
        regexs.copy_construct(&old->regexs)
    }
    fun operator=(other: grammer) {
        destruct()
        copy_construct(&other)
    }
    fun destruct() {
        rules.destruct()
        regexs.destruct()
    }
}

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(&other->lhs)
        rhs.copy_construct(&other->rhs)
        position = other->position
        lookahead.copy_construct(&other->lookahead)
    }
    fun operator=(other: rule) {
        destruct()
        copy_construct(&other)
    }
    fun destruct() {
        lhs.destruct()
        rhs.destruct()
        lookahead.destruct()
    }
}