rosapps/packmgr/lib/tree.cpp

   1 ////////////////////////////////////////////////////////
   2 //
   3 // tree.cpp
   4 //
   5 // Loading of the package tree
   6 //
   7 //
   8 // Maarten Bosma, 09.01.2004
   9 // maarten.paul@bosma.de
  10 //
  11 ////////////////////////////////////////////////////////////////////
  12
  13 #include "package.hpp"
  14 #include "expat.h"
  15
  16 vector <int> parents;
  17
  18 void tree_end (void* tree, const char* tag);
  19 void tree_start (void* usrdata, const char* tag, const char** arg);
  20
  21 int PML_XmlDownload (const char* file, void* usrdata, XML_StartElementHandler start,
  22                                          XML_EndElementHandler end, XML_CharacterDataHandler text=0);
  23
  24
  25 // Load the tree
  26 extern "C" int PML_LoadTree (TREE** tree, char* url, PML_AddItem AddItem)
  27 {
  28         // get the memory
  29         (*tree) = new TREE;
  30
  31         // set every to zero
  32         memset((*tree), 0, sizeof((*tree)));
  33
  34         // set addItem callback
  35         (*tree)->addItem = AddItem;
  36
  37         return PML_XmlDownload (url, (void*)(*tree), tree_start, tree_end);
  38 }
  39
  40 // expat callback for start of a "node" tag
  41 void tree_start (void* usrdata, const char* tag, const char** arg)
  42 {
  43         int i, icon;
  44         static int id = 1;
  45         const char* name = "\0";
  46
  47         TREE* tree = (TREE*)usrdata;
  48
  49         // ignore if tag is the root tag ("tree")
  50         if(!strcmp(tag, "tree"))
  51                 return;
  52
  53         // set the package memory
  54         tree->packages.resize(id+1);
  55         memset(&tree->packages[id], 0, sizeof(tree->packages[id]));
  56
  57         tree->packages[id].loaded = FALSE;
  58         tree->packages[id].icon = FALSE;
  59         tree->packages[id].none = TRUE;
  60         tree->packages[id].path = NULL;
  61
  62         // read the arguments
  63         for (i=0; arg[i]; i+=2)
  64         {
  65                 if(!strcmp(arg[i], "name"))
  66                         name = arg[i+1];
  67
  68                 if(!strcmp(arg[i], "icon"))
  69                 {
  70                         icon = atoi(arg[i+1]);
  71                         tree->packages[id].icon = TRUE;
  72                 }
  73
  74                 if(!strcmp(arg[i], "file"))
  75                 {
  76                         tree->packages[id].path = new char [strlen(arg[i+1])];
  77                         strcpy(tree->packages[id].path, arg[i+1]);
  78
  79                         if(strcmp(tag, "bin"))
  80                                 tree->packages[id].inst = TRUE;
  81
  82                         if(strcmp(tag, "src"))
  83                                 tree->packages[id].src_inst = TRUE;
  84                 }
  85         }
  86
  87         if(name[0]=='\0') return;
  88
  89         // add it
  90         if(!parents.size())
  91            tree->addItem(id, name, 0, icon);
  92         else
  93         {
  94            tree->addItem(id, name, parents.back(), icon);
  95
  96            // list as child in the parent node
  97            tree->packages[parents.back()].children.push_back(id);
  98
  99            // this is for the buttons
 100            tree->packages[parents.back()].inst = tree->packages[parents.back()].inst || tree->packages[id].inst;
 101            tree->packages[parents.back()].src_inst = tree->packages[parents.back()].src_inst || tree->packages[id].src_inst;
 102         }
 103
 104         parents.push_back(id++);
 105 }
 106
 107 // expat callback for end of a "node" tag
 108 void tree_end (void* tree, const char* tag)
 109 {
 110         // delete last item
 111         parents.pop_back();
 112 }