Method jumpTo

chapter16/src/main/java/com/seaofnodes/simple/Parser.java:308–324

(ScopeNode toScope)

    }

    private ScopeNode jumpTo(ScopeNode toScope) {
        ScopeNode cur = _scope.dup();
        ctrl(XCTRL); // Kill current scope
        // Prune nested lexical scopes that have depth > than the loop head
        // We use _breakScope as a proxy for the loop head scope to obtain the depth
        while( cur._lexSize.size() > _breakScope._lexSize.size() )
            cur.pop();
        // If this is a continue then first time the target is null
        // So we just use the pruned current scope as the base for the
        // "continue"
        if( toScope == null )
            return cur;
        // toScope is either the break scope, or a scope that was created here
        assert toScope._lexSize.size() <= _breakScope._lexSize.size();
        toScope.ctrl(toScope.mergeScopes(cur));
        return toScope;
    }

    private void checkLoopActive() { if (_breakScope == null) throw Parser.error("No active loop for a break or continue"); }