JSDOC/CompressWhite.vala
authorAlan Knowles <alan@roojs.com>
Wed, 25 Nov 2015 08:26:36 +0000 (16:26 +0800)
committerAlan Knowles <alan@roojs.com>
Wed, 25 Nov 2015 08:26:36 +0000 (16:26 +0800)
JSDOC/CompressWhite.vala [new file with mode: 0644]

diff --git a/JSDOC/CompressWhite.vala b/JSDOC/CompressWhite.vala
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+/**
+ * 
+ * pack a javascript file, and return a shorter version!
+ * 
+ * a bit picky at present with ; and crlf reading...
+ * @arg ts {TokenStream} 
+   @arg packer {Packer} 
+ */
+namespace JSDOC 
+{
+       public errordomain CompressWhiteError {
+            BRACE
+    }
+       public class  CompressWhite : Object
+       {
+               public CompressWhite (TokenStream ts, Packer packer, bool keepWhite) throws CompressWhiteError,TokenStreamError
+               {
+                       //keepWhite = keepWhite || false;
+                       ts.rewind();
+                       //var str = File.read(fn);
+                       var rep_var = 1;
+               
+               
+               
+                       while (true) {
+                               var tok = ts.next();
+                               if (tok == null) {
+                                   break;
+                               }
+                               if (tok.type == "WHIT") {
+                                  
+                                   continue;
+                                   //if (tok._isDoc) {
+                                   //    continue;
+                                   //}
+                                   // just spaces, not \n!
+                                   //if (tok.data.indexOf("\n") < 0) {
+                                   //    continue;
+                                  // }
+                                   
+                                   
+                               }
+                               if (tok.data == "}")  {
+                                   
+                                   if (ts.lookTok(0).type == "NAME" && ts.look(1,true).name == "NEWLINE") {
+                                       ts.look(0,true).outData = ts.look(0,true).data+"\n";
+                                   }
+                                   // restore.. 
+                                   
+                                   continue;
+                               }
+                               // add semi-colon's where linebreaks are used... - not foolproof yet.!
+                               if (tok.type == "NAME")  {
+                                   //var tokident = ts.look(-1).data + tok.data + ts.look(1).data +  ts.look(2).data;
+                                   // a = new function() {} 
+                                   if (ts.lookTok(1).data == "=" && ts.lookTok(2).name == "NEW"  && 
+                                       ts.lookTok(3).name == "FUNCTION") {
+                                       // freeze time.. 
+                                       var cu = ts.cursor;
+                                       
+                                       ts.balance("(");
+                                       
+                                       
+                                       ts.balance("{");
+                                       // if next is not ';' -> make it so...
+                                       
+                                       if (ts.lookTok(1).data != ";"  && ts.lookTok(1).data != "}" && ts.lookTok(1).name == "NEWLINE") {
+                                           ts.look(0,true).outData = ts.lookTok(0).data +";";
+                                       }
+                                       // restore.. 
+                                       ts.cursor = cu;
+                                       continue;
+                                   }
+                                   // a = function() { ...
+                                      
+                                   if (ts.lookTok(1).data == "=" &&  ts.lookTok(2).name == "FUNCTION") {
+                                       // freeze time.. 
+                                       //println("got = function() ");
+                                       var cu = ts.cursor;
+                                        
+                                       if (ts.balance("(").size < 1 ){
+                                           ts.dump(cu-40, cu);
+                                           print(">>>>>>>>>>>>>>>>>HERE>>>>>>>>>>>>");
+                                           ts.dump(cu, cu+40);
+                                           
+                                           throw new CompressWhiteError.BRACE( "could not find end lbrace!!!" );
+                                       }
+                                       //print("AFTER BALANCE (");
+                                       //ts.dump(cu, ts.cursor);
+                                       //ts.cursor--; // cursor at the (
+                                       if (ts.balance("{").size < 1 ){
+                                           ts.dump(cu-40, cu);
+                                           print(">>>>>>>>>>>>>>>>>HERE>>>>>>>>>>>>");
+                                           ts.dump(cu, cu+40);
+                                           
+                                           throw new CompressWhiteError.BRACE( "could not find end lbrace!!!");
+                                       }
+                                       //print('FN: '+ts.tokens[cu].toString());
+                                       //print('F1: '+ts.lookTok(1).toString());
+                                       //print('F2: '+ts.look(1,true).toString());
+                                       
+                                       // if next is not ';' -> make it so...
+                                       // although this var a=function(){},v,c; causes 
+                                       if (ts.lookTok(1).data != ";" && ts.lookTok(1).data != "}" && ts.look(1,true).name == "NEWLINE") {
+                                           
+                                           ts.look(0,true).outData = ts.look(0,true).data+";";
+                                          // print("ADDING SEMI: " + ts.look(0).toString());
+                                           //ts.dump(cu, ts.cursor+2);
+                                       }
+                                       
+                                        //ts.dump(cu, ts.cursor+2);
+                                       // restore.. 
+                                       ts.cursor = cu;
+                                       continue;
+                                   }
+                                   // next item is a name..
+                                   if ((ts.lookTok(1).type == "NAME" || ts.lookTok(1).type == "KEYW" ) &&  ts.look(1,true).name == "NEWLINE") {
+                                       // preserve linebraek
+                                       ts.look(0,true).outData = ts.look(0,true).data+"\n";
+                                   }
+                                   // method call followed by name..
+                                   if (ts.lookTok(1).data == "(")  {
+                                       var cu = ts.cursor;
+                                       
+                                       ts.balance("(");
+                                        // although this var a=function(){},v,c; causes 
+                                       
+                                       if (ts.lookTok(1).type == "NAME" && ts.look(1,true).name == "NEWLINE") {
+                                       
+                                           ts.look(0,true).outData = ts.look(0,true).data+"\n";
+                                       }
+                                       // restore.. 
+                                       ts.cursor = cu;
+                                       continue;
+                                   }
+                                   
+                                   
+                                   // function a () { ... };
+                                       /*
+                                   if (ts.look(-1).isTypeN(Script.TOKfunction) &&  ts.look(1).isTypeN(Script.TOKlparen)) {
+                                       // freeze time.. 
+                                       //println("got = function() ");
+                                       var cu = ts.cursor;
+                                       
+                                       ts.balance("lparen");
+                                       ts.balance("lbrace");
+                                       // if next is not ';' -> make it so...
+                                       // although this var a=function(){},v,c; causes 
+                                       if (!ts.look(1).isData(';') && !ts.look(1).isData('}') && ts.look(1,true).isLineBreak()) {
+                                           ts.cur().outData = ts.cur().data+";";
+                                       }
+                                       // restore.. 
+                                       ts.cursor = cu;
+                                       continue;
+                                   }
+                                   */
+                                   
+                                   // a = { ....
+                                       
+                                   if (ts.lookTok(1).data == "=" &&  ts.lookTok(2).data == "{") {
+                                       // freeze time.. 
+                                       //println("----------*** 3 *** --------------");
+                                       var cu = ts.cursor;
+                                       
+                                       if (ts.balance("{").size < 1 ){
+                                           ts.dump(cu-40, cu);
+                                           print(">>>>>>>>>>>>>>>>>HERE>>>>>>>>>>>>");
+                                           ts.dump(cu, cu+40);
+                                           
+                                           throw new CompressWhiteError.BRACE("could not find end lbrace!!!");
+                                       }
+                                       // if next is not ';' -> make it so...
+                                       
+                                       if (ts.lookTok(1).data != ";" && ts.lookTok(1).data != "}" && ts.look(1,true).name=="NEWLINE") {
+                                           ts.look(0,true).outData = ts.look(0,true).data +";";
+                                       }
+                                       // restore.. 
+                                       ts.cursor = cu;
+                                       continue;
+                                   }
+                                   
+                                   // any more??
+                                   // a = function(....) { } 
+                                 
+                               }
+                               
+                               
+                               
+                                
+                               //println("got Token: " + tok.type);
+                               
+                               
+                               
+                               switch(tok.data.up()) {
+                                   // things that need space appending
+                                   case "FUNCTION":
+                                   case "BREAK":
+                                   case "CONTINUE":
+                                       // if next item is a identifier..
+                                       if (ts.lookTok(1).type == "NAME" || Regex.match_simple("^[a-z]+$", ts.lookTok(1).data, GLib.RegexCompileFlags.CASELESS) ) { // as include is a keyword for us!!
+                                          tok.outData =  tok.data + " ";
+                                       }
+                                       continue;
+                                       
+                                       
+                                   case "RETURN": // if next item is not a semi; (or }
+                                       if (ts.lookTok(1).data == ";" || ts.lookTok(1).data == "}") {
+                                           continue;
+                                       }
+                                       tok.outData =  tok.data + " ";
+                                       
+                                       continue;
+                                   
+                                       
+                                   case "ELSE": // if next item is not a semi; (or }
+                                       if (!ts.lookTok(1).name == "IF") {
+                                           continue;
+                                       }
+                                       
+                                       tok.outData =  tok.data + " ";
+                                       continue;
+                                   
+                                   case "++": // if previous was a plus or next is a + add a space..
+                                   case "--": // if previous was a - or next is a - add a space..
+                                   
+                                       var p = (tok.data == "--" ? '-' : '+'); 
+                                   
+                                       if (ts.lookTok(1).data == p) {
+                                           tok.outData =  tok.data + " ";
+                                       }
+                                       if (ts.lookTok(-1).data == p) {
+                                           tok.outData =  " " +  tok.data;
+                                           
+                                       }
+                                       continue;
+                                   
+                                   case "IN": // before and after?? 
+                                   case "INSTANCEOF":
+                                       
+                                       tok.outData = " " + tok.data + " ";
+                                       continue;
+                                   
+                                   case "VAR": // always after..
+                                   case "NEW":
+                                   case "DELETE":
+                                   case "THROW":
+                                   case "CASE":
+                                   
+                                   case "VOID":
+                                       tok.outData =  tok.data + " ";
+                                       
+                                       continue;
+                                       
+                                   case "TYPEOF": // what about typeof(
+                                       if (ts.lookTok(1).data != '(') {
+                                           tok.outData =  tok.data + " ";
+                                       }
+                                       continue;
+                                    case ";":
+                                       //remove semicolon before brace -- 
+                                       //if(ts.look(1).isTypeN(Script.TOKrbrace)) {
+                                       //    tok.outData = '';
+                                      // }
+                                       continue;
+                                  
+                                   default:
+                                       continue;
+                               }
+                       }
+               
+                       ts.rewind();
+               
+                       // NOW OUTPUT THE THING.
+                       //var f = new File(minfile, File.NEW);
+               
+                       var out = '';
+                       var outoff = 0;
+                       //try { out.length = ts.slen; } catch (e) {} // prealloc.
+               
+                       out = '';
+                       var tok;
+                       while (true) {
+                               
+                               tok = keepWhite ? ts.next() : ts.nextTok();
+                               
+                               if (!tok) {
+                                   break;
+                               }
+                               if (tok.type == "COMM") {
+                                   tok.outData = '\n';
+                               }
+                               
+                               ///print(tok.type + ':' + tok.data);
+                               
+                               if (tok.type == "NAME"  && tok.identifier 
+                                   && tok.identifier.mungedValue && tok.identifier.mungedValue.length) {
+                                   //f.write(tok.identifier.mungedValue);
+                                   //print("MUNGED: " + tok.identifier.mungedValue);
+                                   out += tok.identifier.mungedValue;
+                                   continue;
+                               }
+                               
+                               // at this point we can apply a text translation kit...
+                               
+                               if ((tok.type == "STRN") && (tok.name== "DOUBLE_QUOTE")) {
+                                   if (packer && packer.stringHandler) {
+                                       out += packer.stringHandler(tok);
+                                       continue;
+                                   }
+                               }
+                        
+                               out += tok.outData != "" ? tok.outData : tok.data;
+                               
+                               if ((tok.outData == ";") && (out.length - outoff > 255)) {
+                                   outoff = out.length;
+                                   out += "\n";
+                               }
+                       }
+                       //f.close();
+                       /*
+                       // remove the last ';' !!!
+                       if (out.substring(out.length-1) == ';') {
+                               return out.substring(0,out.length-1);
+                          }
+                       */
+                       return out;
+               
+               }
+       }       
+}
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