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 int LoadOptions (TREE* tree);
  19
  20 void tree_end (void* tree, const char* tag);
  21 void tree_start (void* usrdata, const char* tag, const char** arg);
  22
  23 int PML_XmlDownload (pTree tree, const char* file, void* usrdata, XML_StartElementHandler start,
  24                                                                                         XML_EndElementHandler end, XML_CharacterDataHandler text=0);
  25
  26
  27 // Load the tree
  28 extern "C" int PML_LoadTree (TREE** tree, char* url, PML_AddItem AddItem)
  29 {
  30         // get the memory
  31         (*tree) = new TREE;
  32
  33         // set every to zero
  34         memset((*tree), 0, sizeof((*tree)));
  35
  36         // set addItem callback
  37         (*tree)->addItem = AddItem;
  38
  39         LoadOptions(*tree);
  40
  41         return PML_XmlDownload (*tree, url, (void*)(*tree), tree_start, tree_end);
  42 }
  43
  44 // expat callback for start of a "node" tag
  45 void tree_start (void* usrdata, const char* tag, const char** arg)
  46 {
  47         int i, icon = 0;
  48         static int id = 1;
  49
  50         TREE* tree = (TREE*)usrdata;
  51
  52         // ignore if tag is the root tag ("tree")
  53         if(!strcmp(tag, "tree"))
  54                 return;
  55
  56         // set the package memory
  57         tree->packages.resize(id+1);
  58         memset(&tree->packages[id], 0, sizeof(tree->packages[id]));
  59
  60         tree->packages[id].loaded = FALSE;
  61         tree->packages[id].icon = FALSE;
  62         tree->packages[id].none = TRUE;
  63         tree->packages[id].path = NULL;
  64         tree->packages[id].name = "\0";
  65
  66         // read the arguments
  67         for (i=0; arg[i]; i+=2)
  68         {
  69                 if(!strcmp(arg[i], "name"))
  70                 {
  71                         tree->packages[id].name = new char [strlen(arg[i+1])+1];
  72                         strcpy(tree->packages[id].name, arg[i+1]);
  73                 }
  74
  75                 if(!strcmp(arg[i], "icon"))
  76                 {
  77                         icon = atoi(arg[i+1]);
  78                         tree->packages[id].icon = TRUE;
  79                 }
  80
  81                 if(!strcmp(arg[i], "file"))
  82                 {
  83                         tree->packages[id].path = new char [strlen(arg[i+1])+1];
  84                         strcpy(tree->packages[id].path, arg[i+1]);
  85
  86                         if(strcmp(tag, "bin"))
  87                                 tree->packages[id].inst = TRUE;
  88
  89                         if(strcmp(tag, "src"))
  90                                 tree->packages[id].src_inst = TRUE;
  91                 }
  92         }
  93
  94         if(tree->packages[id].name[0] == '\0') return;
  95
  96         // add it
  97         if(!parents.size())
  98         {
  99                 if(tree->addItem)
 100                         tree->addItem(id, tree->packages[id].name, 0, icon);
 101         }
 102
 103         // do some manipulation at the parent
 104         else
 105         {
 106            if(tree->addItem)
 107                tree->addItem(id, tree->packages[id].name, parents.back(), icon);
 108
 109            // list as child in the parent node
 110            tree->packages[parents.back()].children.push_back(id);
 111
 112            // this is for the buttons
 113            tree->packages[parents.back()].inst = tree->packages[parents.back()].inst || tree->packages[id].inst;
 114            tree->packages[parents.back()].src_inst = tree->packages[parents.back()].src_inst || tree->packages[id].src_inst;
 115         }
 116
 117         parents.push_back(id++);
 118 }
 119
 120 // expat callback for end of a "node" tag
 121 void tree_end (void* tree, const char* tag)
 122 {
 123         // delete last item
 124         parents.pop_back();
 125 }
 126