git.roojs.org Git - roobuilder/blob - src/JsRender/JsonGen.vala

   1
   2 /**
   3
   4 based on...
   5 https://gitlab.gnome.org/GNOME/json-glib/-/blob/master/json-glib/json-generator.c
   6
   7 note - that could probably be fixed by just adding the sort method on members List..
   8
   9 */
  10 namespace JsRender {
  11
  12         public class JsonGen : Object
  13         {
  14
  15                 Json.Generator generator;
  16                 Json.Node node;
  17                 public bool pretty = true;
  18                 public int indent = 1;
  19                 public char indent_char = ' ';
  20                 public JsonGen( Json.Node node )
  21                 {
  22
  23                         this.generator = new Json.Generator ();
  24                         this.generator.indent = this.indent;
  25                         this.generator.pretty = this.pretty;
  26                         this.node = node;
  27                 }
  28
  29
  30                 public string to_data()
  31                 {
  32                         var buffer = new GLib.StringBuilder();
  33                         dump_node(buffer,0, this.node, "", false);
  34                         return buffer.str;
  35                 }
  36
  37
  38
  39                 void dump_node (
  40                                 GLib.StringBuilder buffer,
  41                                 int                     level,
  42                        Json.Node        node,
  43                        string           name,
  44                        bool                     has_name
  45                        )
  46                 {
  47
  48
  49                           if (this.pretty) {
  50
  51                                   for (var i = 0; i < (level * this.indent); i++) {
  52                                                 buffer.append_c(this.indent_char);
  53                                   }
  54                           }
  55
  56                           if (has_name){
  57                                         // fixme...
  58                                         // initiate a node as a string... then output it..
  59                                         //buffer.append_c( '"'); // might not be needed..
  60                                         var k = new Json.Node(Json.NodeType.VALUE);
  61                                         k.init_string(name);
  62                                         dump_value(buffer,k);
  63
  64                                         //buffer.append_c( '"');
  65
  66                                   if (this.pretty) {
  67                                         buffer.append( " : ");
  68                                   } else {
  69                                         buffer.append_c( ':');
  70                                 }
  71                 }
  72
  73                         switch (node.get_node_type()) {
  74                                 case Json.NodeType.NULL:
  75                                   buffer.append( "null");
  76                                   break;
  77
  78                                 case Json.NodeType.VALUE:
  79                                   size_t sl;
  80                                   this.generator.set_root(node);
  81                                   var str = this.generator.to_data(out sl);
  82                                   buffer.append( str );
  83                                   break;
  84
  85                                 case Json.NodeType.ARRAY:
  86                                   this.dump_array ( buffer, level, node.get_array());
  87                                   break;
  88
  89                                 case Json.NodeType.OBJECT:
  90                                   this.dump_object (buffer, level, node.get_object());
  91                                   break;
  92                         }
  93                 }
  94
  95                 void dump_value (GLib.StringBuilder buffer, Json.Node node)
  96                 {
  97                         size_t slen;
  98                         this.generator.set_root(node);
  99                         buffer.append( this.generator.to_data(out slen) );
 100                 }
 101
 102                 void dump_array (
 103            GLib.StringBuilder buffer,
 104             int           level,
 105             Json.Array     array)
 106                 {
 107
 108
 109                   var array_len = array.get_length();
 110
 111                   var pretty = this.pretty;
 112
 113
 114                   buffer.append_c( '[');
 115
 116                   if (array_len == 0) {
 117                            buffer.append_c( ']');
 118                            return;
 119                   }
 120
 121                   for (var i = 0; i < array_len; i++) {
 122                           var cur = array.get_element ( i);
 123
 124                           if (i == 0 && pretty) {
 125                                 buffer.append_c('\n');
 126                           }
 127                           this.dump_node ( buffer, level + 1, cur, "", false);
 128
 129                           if ((i + 1) != array_len) {
 130                                 buffer.append_c( ',');
 131                          }
 132                           if (pretty) {
 133                                 buffer.append_c( '\n');
 134                         }
 135                   }
 136
 137                   if (pretty) {
 138                           for (var i = 0; i < (level * this.indent); i++) {
 139                                 buffer.append_c(this.indent_char);
 140                          }
 141                   }
 142
 143                   buffer.append_c( ']');
 144                 }
 145
 146                  void dump_object (
 147                         GLib.StringBuilder buffer,
 148                         int           level,
 149                         Json.Object     object)
 150                 {
 151
 152
 153                   var  pretty = this.pretty;
 154
 155
 156
 157                   buffer.append_c('{');
 158                   buffer.append_c(  '\n');
 159                   var members = object.get_members();
 160                   members.sort(GLib.strcmp);
 161
 162                         var mi = -1;
 163                         members.foreach ( (member_name) => {
 164                                 mi++;
 165
 166                                 var cur = object.get_member( member_name);
 167
 168                                 //if (mi > 0 && pretty) {
 169                                 //      buffer.append_c(  '\n');
 170                                 //}
 171
 172                                 dump_node (buffer, level + 1, cur,  member_name, true);
 173
 174                                 if (mi < members.length()-1) {
 175                                         buffer.append_c(  ',');
 176                                 }
 177                                 if (pretty) {
 178                                         buffer.append_c(  '\n');
 179                                 }
 180                         });
 181
 182                         if (pretty)
 183                         {
 184                                 for (var i = 0; i < (level * this.indent); i++) {
 185                                         buffer.append_c( this.indent_char);
 186                                 }
 187                         }
 188
 189                  buffer.append_c(  '}');
 190                 }
 191
 192
 193     }
 194
 195 }
 196
 197
 198 /*
 199 compile :
 200
 201 valac --pkg json-glib-1.0 -D JSON_TESTCODE Json.vala
 202 */
 203
 204 #if JSON_TESTCODE
 205 void main (string[] args) {
 206
 207         var testjson = """
 208         {"quiz":{"sport":{"q1":{"question":"Which one is correct team name in NBA?","options":["New York Bulls",
 209         "Los Angeles Kings","Golden State Warriros","Huston Rocket"],"answer":"Huston Rocket"}},"maths":
 210         {"q1":{"question":"5 + 7 = ?","options":["10","11","12","13"],"answer":"12"},"q2":
 211         {"question":"12 - 8 = ?","options":["1","2","3","4"],"answer":"4"}}}}
 212         """;
 213         var parser =   new Json.Parser ();
 214         parser.load_from_data(testjson);
 215
 216         var node = parser.get_root ();
 217
 218         var js = new JsRender.JsonGen(node);
 219         print("OUT: %s", js.to_data());
 220
 221
 222
 223 }
 224
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