git.roojs.org Git - gnome.introspection-doc-generator/blob - JSDOC/TokenStream.vala

   1
   2 /**
   3  * @class TokenStream
   4  *
   5  * BC notes:
   6  *
   7  * nextT => nextTok
   8  * lookT => lookTok
   9  *
  10  */
  11
  12
  13 namespace JSDOC {
  14
  15         public class TokenStream : Object
  16         {
  17
  18                 private Gee.ArrayList<Token> tokens;
  19             private int cursor; // where are we in the stream.
  20
  21
  22                 public TokenStream(Gee.ArrayList<Token> tokens) {
  23
  24                     this.tokens = tokens;
  25
  26                     this.rewind();
  27                 }
  28
  29
  30
  31             public void rewind() {
  32                 this.cursor = -1;
  33             }
  34
  35             /**
  36                 @type JSDOC.Token
  37             */
  38             public Token? look (int n, bool considerWhitespace)
  39             {
  40
  41
  42                 if (considerWhitespace == true) {
  43
  44                     if (this.cursor+n < 0 || this.cursor+n > (this.tokens.length -1)) {
  45                         return new Token("", "VOID", "START_OF_STREAM");
  46                     }
  47                     return this.tokens.get(this.cursor+n);
  48                 }
  49
  50
  51             var count = 0;
  52             var i = this.cursor;
  53
  54             while (true) {
  55                 if (i < 0) {
  56                         return new Token("", "VOID", "START_OF_STREAM");
  57                         }
  58                 if (i > this.tokens.length) {
  59                         return new Token("", "VOID", "END_OF_STREAM");
  60                         }
  61
  62                 if (i != this.cursor && this.tokens.get(i).is("WHIT")) {
  63                         i += (n < 0) ? -1 : 1;
  64                     continue;
  65                 }
  66
  67                 if (count == n) {
  68                     return this.tokens.get(i);
  69                 }
  70                 count++;
  71                 i += (n < 0) ? -1 : 1;
  72             }
  73
  74             return new Token("", "VOID", "STREAM_ERROR"); // because null isn't an object and caller always expects an object
  75
  76             }
  77
  78             public int lookFor : function (data)
  79             {
  80                 // non tree version..
  81                 var i = this.cursor < 0 ? 0 : this.cursor ;
  82
  83                 while (true) {
  84                     if (i >= this.tokens.length) return -1;
  85                     if (this.tokens[i].data == data) {
  86                         return i;
  87                     }
  88                     i++;
  89
  90                 }
  91                 // should not get here!
  92                 return -1;
  93
  94             },
  95
  96
  97             /**
  98              * look ahead (or back) x number of tokens (which are not comment or whitespace)
  99              * ?? used any more?
 100              */
 101             lookTok : function(/**Number*/n) {
 102                 if (typeof n == "undefined") n = 1;
 103
 104
 105                 var count = 0;
 106                 var i = this.cursor;
 107
 108                 while (true) {
 109                    // print(i);
 110                     if (i < 0) {
 111                         if (n > -1) {
 112                             i = 0;
 113                             count++;
 114                             continue;
 115
 116                         }
 117                         return   new Token("", "VOID", "END_OF_STREAM");
 118                     }
 119                     else if (i > this.tokens.length) return  new Token("", "VOID", "END_OF_STREAM");
 120
 121                     if (i != this.cursor && (this.tokens[i] === undefined || this.tokens[i].is("WHIT") || this.tokens[i].is("COMM"))) {
 122                         if (n < 0) i--; else i++;
 123                         continue;
 124                     }
 125
 126                     if (count == Math.abs(n)) {
 127                         return this.tokens[i];
 128                     }
 129                     count++;
 130                     (n < 0)? i-- : i++;
 131                 }
 132             // should never get here..
 133                 return false; // because null isn't an object and caller always expects an object;
 134
 135             },
 136
 137             /**
 138              *  @return {Token|null}
 139              * next token (with white space)
 140              */
 141
 142
 143             next : function(/**Number*/howMany) {
 144                 if (typeof howMany == "undefined") howMany = 1;
 145                 if (howMany < 1) return null;
 146                 var got = [];
 147
 148                 for (var i = 1; i <= howMany; i++) {
 149                     if (this.cursor+i >= this.tokens.length) {
 150                         return null;
 151                     }
 152                     got.push(this.tokens[this.cursor+i]);
 153                 }
 154                 this.cursor += howMany;
 155
 156                 if (howMany == 1) {
 157                     return got[0];
 158                 }
 159                 else return got;
 160             },
 161             // what about comments after 'function'...
 162             // is this used ???
 163             nextTok  : function() {
 164                 return this.nextNonSpace();
 165             },
 166             nextNonSpace : function ()
 167             {
 168
 169                 while (true) {
 170                     tok = this.next(1);
 171                     if (!tok) {
 172                         return false;
 173                     }
 174                     if (tok.is('WHIT') ||  tok.is('COMM')) {
 175                         continue;
 176                     }
 177                     return tok;
 178                 }
 179             },
 180             /**
 181              *    @type JSDOC.Token[]
 182              * @param start {String}  token name or data (eg. '{'
 183              * @param stop {String} (Optional) token name or data (eg. '}'
 184              */
 185             balance : function(/**String*/start, /**String*/stop) {
 186
 187
 188                 start = typeof(Lang.punc(start)) == 'undefined' ? start : Lang.punc(start);
 189
 190                 if (!stop) stop = Lang.matching(start);
 191
 192                 var depth = 0;
 193                 var got = [];
 194                 var started = false;
 195                 //Seed.print("START:" + start);
 196                 //Seed.print("STOP:" + stop);
 197                 while ((token = this.look())) {
 198                     if (token.is(start)) {
 199                   //      Seed.print("balance: START : " + depth + " " + token.data);
 200                         depth++;
 201                         started = true;
 202                     }
 203
 204                     if (started) {
 205                         got.push(token);
 206                     }
 207
 208                     if (token.is(stop)) {
 209                         depth--;
 210                     //    Seed.print("balance: STOP: "  + depth + " " + token.data);
 211                         if (depth < 1) return got;
 212                     }
 213                     if (!this.next()) break;
 214                 }
 215                 return false;
 216             },
 217
 218             getMatchingToken : function(/**String*/start, /**String*/stop) {
 219                 var depth = 0;
 220                 var cursor = this.cursor;
 221
 222                 if (!start) {
 223                     start = Lang.matching(stop);
 224                     depth = 1;
 225                 }
 226                 if (!stop) stop = Lang.matching(start);
 227
 228                 while ((token = this.tokens[cursor])) {
 229                     if (token.is(start)) {
 230                         depth++;
 231                     }
 232
 233                     if (token.is(stop) && cursor) {
 234                         depth--;
 235                         if (depth == 0) return this.tokens[cursor];
 236                     }
 237                     cursor++;
 238                 }
 239                 return false;
 240             },
 241
 242             insertAhead : function(/**JSDOC.Token*/token) {
 243                 this.tokens.splice(this.cursor+1, 0, token);
 244             },
 245
 246             remaining : function() {
 247                 var ret = [];
 248                 while (true) {
 249                     var tok = this.look(1,true);
 250                     if (!tok || !tok.is || tok.is('VOID')) {
 251                         return ret;
 252                     }
 253                     ret.push(this.next(1));
 254                 }
 255             },
 256
 257
 258             arrayToString : function(ar) {
 259                 console.log(typeof(ar));
 260                 var ret = [];
 261                 ar.forEach(function(e) {
 262                     ret.push(e.data);
 263                 })
 264                 return ret.join('');
 265             },
 266             dump: function(start, end)
 267             {
 268                 start = Math.max(start || 0, 0);
 269                 end = Math.min(end || this.tokens.length, this.tokens.length);
 270                 var out='';
 271                 for (var i =start;i < end; i++) {
 272
 273                     out += (this.tokens[i].outData == false) ? this.tokens[i].data : this.tokens[i].outData;
 274                 };
 275                 print(out);
 276             }
 277 });
 278