求教！哪位大神给我讲解一下这一串代码是什么意思？新手上路，很着急！！！！！！！

treenode thelist = getvarnode(current,"componentlist");
3 j+ i% \8 X9 w  treenode thesum = getvarnode(current,"targetcomponentsum");
  setnodenum(thesum,0);
, f8 e5 P1 s* {$ T
" Z' H" J5 S9 W7 M" b   {
     setnodenum(cellrowcolumn(thelist,1,1),getlabelnum(first(current),"1"));
    inc(thesum,getlabelnum(first(current),"1"));
     setnodenum(cellrowcolumn(thelist,2,1),getlabelnum(first(current),"2"));
9 K7 p  e5 q& l; e) s: n6 P    inc(thesum,getlabelnum(first(current),"2"));
     setnodenum(cellrowcolumn(thelist,3,1),getlabelnum(first(current),"3"));
    inc(thesum,getlabelnum(first(current),"3"));
9 t6 y2 [4 l1 \0 K& I' m8 w/ T     setnodenum(cellrowcolumn(thelist,4,1),getlabelnum(first(current),"4"));
$ Z. P( c, u0 e1 {    inc(thesum,getlabelnum(first(current),"4"));
+ d$ l, f+ D% F: G$ B  }
6 z; Q- P2 d, l$ C  b; r2 S1 u}

2# missman
! [% B& F+ X# ~0 \5 z& u
5 u; O1 @0 Z" t5 N" c我这新手，主要是不明白  setnodenum 、getlabelnum这之类的具体什么含义，有什么作用