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                 Gee.ArrayList<Token> tokens;
  19             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.size -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.size) {
  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  (string data)
  79             {
  80                 // non tree version..
  81                 var i = this.cursor < 0 ? 0 : this.cursor ;
  82
  83                 while (true) {
  84                     if (i >= this.tokens.size) {
  85                                 return -1;
  86                         }
  87                     if (this.tokens.get(i).data == data) {
  88                         return i;
  89                     }
  90                     i++;
  91
  92                 }
  93                 // should not get here!
  94                 return -1;
  95
  96             }
  97
  98
  99             /**
 100              * look ahead (or back) x number of tokens (which are not comment or whitespace)
 101              * ?? used any more?
 102              */
 103             public Token? lookTok (int n) {
 104
 105
 106
 107                 var count = 0;
 108                 var i = this.cursor;
 109
 110                 while (true) {
 111                    // print(i);
 112                     if (i < 0) {
 113                         if (n > -1) {
 114                             i = 0;
 115                             count++;
 116                             continue;
 117
 118                         }
 119                         return   new Token("", "VOID", "END_OF_STREAM");
 120                     }
 121                     else if (i > this.tokens.length) return  new Token("", "VOID", "END_OF_STREAM");
 122
 123                     if (i != this.cursor && (this.tokens[i] === undefined || this.tokens[i].is("WHIT") || this.tokens[i].is("COMM"))) {
 124                         if (n < 0) i--; else i++;
 125                         continue;
 126                     }
 127
 128                     if (count == Math.abs(n)) {
 129                         return this.tokens[i];
 130                     }
 131                     count++;
 132                     (n < 0)? i-- : i++;
 133                 }
 134             // should never get here..
 135                 return false; // because null isn't an object and caller always expects an object;
 136
 137             },
 138
 139             /**
 140              *  @return {Token|null}
 141              * next token (with white space)
 142              */
 143
 144
 145             next : function(/**Number*/howMany) {
 146                 if (typeof howMany == "undefined") howMany = 1;
 147                 if (howMany < 1) return null;
 148                 var got = [];
 149
 150                 for (var i = 1; i <= howMany; i++) {
 151                     if (this.cursor+i >= this.tokens.length) {
 152                         return null;
 153                     }
 154                     got.push(this.tokens[this.cursor+i]);
 155                 }
 156                 this.cursor += howMany;
 157
 158                 if (howMany == 1) {
 159                     return got[0];
 160                 }
 161                 else return got;
 162             },
 163             // what about comments after 'function'...
 164             // is this used ???
 165             nextTok  : function() {
 166                 return this.nextNonSpace();
 167             },
 168             nextNonSpace : function ()
 169             {
 170
 171                 while (true) {
 172                     tok = this.next(1);
 173                     if (!tok) {
 174                         return false;
 175                     }
 176                     if (tok.is('WHIT') ||  tok.is('COMM')) {
 177                         continue;
 178                     }
 179                     return tok;
 180                 }
 181             },
 182             /**
 183              *    @type JSDOC.Token[]
 184              * @param start {String}  token name or data (eg. '{'
 185              * @param stop {String} (Optional) token name or data (eg. '}'
 186              */
 187             balance : function(/**String*/start, /**String*/stop) {
 188
 189
 190                 start = typeof(Lang.punc(start)) == 'undefined' ? start : Lang.punc(start);
 191
 192                 if (!stop) stop = Lang.matching(start);
 193
 194                 var depth = 0;
 195                 var got = [];
 196                 var started = false;
 197                 //Seed.print("START:" + start);
 198                 //Seed.print("STOP:" + stop);
 199                 while ((token = this.look())) {
 200                     if (token.is(start)) {
 201                   //      Seed.print("balance: START : " + depth + " " + token.data);
 202                         depth++;
 203                         started = true;
 204                     }
 205
 206                     if (started) {
 207                         got.push(token);
 208                     }
 209
 210                     if (token.is(stop)) {
 211                         depth--;
 212                     //    Seed.print("balance: STOP: "  + depth + " " + token.data);
 213                         if (depth < 1) return got;
 214                     }
 215                     if (!this.next()) break;
 216                 }
 217                 return false;
 218             },
 219
 220             getMatchingToken : function(/**String*/start, /**String*/stop) {
 221                 var depth = 0;
 222                 var cursor = this.cursor;
 223
 224                 if (!start) {
 225                     start = Lang.matching(stop);
 226                     depth = 1;
 227                 }
 228                 if (!stop) stop = Lang.matching(start);
 229
 230                 while ((token = this.tokens[cursor])) {
 231                     if (token.is(start)) {
 232                         depth++;
 233                     }
 234
 235                     if (token.is(stop) && cursor) {
 236                         depth--;
 237                         if (depth == 0) return this.tokens[cursor];
 238                     }
 239                     cursor++;
 240                 }
 241                 return false;
 242             },
 243
 244             insertAhead : function(/**JSDOC.Token*/token) {
 245                 this.tokens.splice(this.cursor+1, 0, token);
 246             },
 247
 248             remaining : function() {
 249                 var ret = [];
 250                 while (true) {
 251                     var tok = this.look(1,true);
 252                     if (!tok || !tok.is || tok.is('VOID')) {
 253                         return ret;
 254                     }
 255                     ret.push(this.next(1));
 256                 }
 257             },
 258
 259
 260             arrayToString : function(ar) {
 261                 console.log(typeof(ar));
 262                 var ret = [];
 263                 ar.forEach(function(e) {
 264                     ret.push(e.data);
 265                 })
 266                 return ret.join('');
 267             },
 268             dump: function(start, end)
 269             {
 270                 start = Math.max(start || 0, 0);
 271                 end = Math.min(end || this.tokens.length, this.tokens.length);
 272                 var out='';
 273                 for (var i =start;i < end; i++) {
 274
 275                     out += (this.tokens[i].outData == false) ? this.tokens[i].data : this.tokens[i].outData;
 276                 };
 277                 print(out);
 278             }
 279 });
 280