--- loncom/homework/CAPA-converter/capaLexerDef.flex	2001/11/15 21:42:42	1.9
+++ loncom/homework/CAPA-converter/capaLexerDef.flex	2002/03/20 18:15:00	1.19
@@ -1,3 +1,30 @@
+/* The LearningOnline Network with CAPA
+ * CAPA lexer dfinition, heavily modified to become a LON-CAPA convertor 
+ * $Id: capaLexerDef.flex,v 1.19 2002/03/20 18:15:00 albertel Exp $
+ *
+ * Copyright Michigan State University Board of Trustees
+ *
+ * This file is part of the LearningOnline Network with CAPA (LON-CAPA).
+ *
+ * LON-CAPA is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * LON-CAPA is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with LON-CAPA; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * /home/httpd/html/adm/gpl.txt
+ *
+ * http://www.lon-capa.org/
+ */
+
 /*------------------------------------------------------------------------*/
 /*         capaLexerDef.flex   created by Isaac Tsai Jul 15 1996          */
 /*                             added /END(variable)                       */
@@ -119,12 +146,12 @@ Symbol       *FmlSymbLast_p;
 int           FmlSymb_cnt;
 int           Symb_count;
 
-int           IFstatus[MAX_FUNC_NEST];     /* <-- perhaps we can use linked list */
-int           IFcurrent[MAX_FUNC_NEST];    /* <-- perhaps we can use linked list */
 int           IFcount;
 WhileLoop_t   WhileStack[MAX_FUNC_NEST];   /* <-- perhaps we can use linked list */
 int           While_idx, Wcount;
 int           sccount;		           /* Semi-colon count for MAP and RMAP  */
+int           HINTflag=0;
+int           EXPflag=0;
 
 #ifdef  USE_DYNAMIC_SYMBOLS
 Symbol       *SymbList_p;
@@ -362,7 +389,7 @@ EndLine    ([\r][\n]|[\n])
 %n 1000
 %x  S_COMMENT   S_HINT S_HINTEXLAINX  S_IMPORT S_EXPLAIN S_ENDX    S_UNIT   S_IGNORE  
 %x  S_SKIP      S_VARIABLE S_LET  S_DEFINE     S_TEXT    S_MAP     S_FIGURE S_ANSWER 
-%x  S_STRING    S_ANSCONTINUE     S_TRUE_FALSE_STMT      S_IF_SKIP S_WHILE_SKIP
+%x  S_STRING    S_ANSCONTINUE     S_TRUE_FALSE_STMT      S_WHILE_SKIP
 %x  S_NEXT_LINE S_VERB   S_ECHO S_STRINGINANS
 %array
 
@@ -402,10 +429,20 @@ EndLine    ([\r][\n]|[\n])
 				   send("<PRE>\n");
                                  }
 ^{Spaces}"/HIN"{Alpha}*{Spaces}  { LLDBUG_PRL1("[HIN]"); 
-                                   start_mode(MODE_HINT, "");
+                               /*    start_mode(MODE_HINT, "");*/
+                                   if (!HINTflag) {
+                                     start_streams(HINT_DEST,1);
+                                     HINTflag=-1;
+                                   }
+                                   change_destination(HINT_DEST);
 				   BEGIN S_HINT; 
                                  }
-^{Spaces}"/EXP"{Alpha}*{Spaces}  { start_mode(MODE_BLOCK,"condition=&explanation");
+^{Spaces}"/EXP"{Alpha}*{Spaces}  { 
+                                   if (!EXPflag) {
+                                     start_streams(EXP_DEST,1);
+                                     EXPflag=-1;
+                                   }
+                                   change_destination(EXP_DEST);
                                    LLDBUG_PRL1("[EXP]"); Current_char_p = String_buf;  BEGIN S_EXPLAIN; }
 ^{Spaces}"/IMP"{Alpha}*{Space}+  { LLDBUG_PRL1("[IMP]"); BEGIN S_IMPORT; end_mode(); }
 ^{Spaces}"/END"                  { LLDBUG_PRL1("[END]");  
@@ -444,59 +481,95 @@ EndLine    ([\r][\n]|[\n])
                                 Pcount = 0; 
                                 BEGIN S_ANSWER;
                                 end_mode();
+				start_mode(MODE_ANSWER,NULL);
                                 send("<capasubjectiveresponse");
-				dosend=1;    
+				dosend=1; 
 				firstparam=1;                            
                               }
 ^{Spaces}"/MAP"               { LLDBUG_PRL1("[MAP]");  Pcount = 0; sccount = 0; BEGIN S_MAP; start_mode(MODE_SCRIPT,NULL);send("&map("); }
 ^{Spaces}"/RMAP"              { LLDBUG_PRL1("[RMAP]"); Pcount = 0; sccount = 0; BEGIN S_MAP; start_mode(MODE_SCRIPT,NULL);send("&rmap("); }
-^{Spaces}"/ENDWHILE"([^\n])*          { long int  file_pos;       
-                                int   top_item, input_idx;
-                                LLDBUG_PRL2("[ENDWHILE While_idx=<%d>]\n",While_idx);
-                                
-                                top_item = While_idx - 1;
-                                if( top_item < 0 ) { /* strange things must have happened here! */
-                                  
-                                } else {
-                                  input_idx = WhileStack[top_item].input_idx;
-                                  file_pos = WhileStack[top_item].pos_idx;
-                                  Current_line[input_idx] = WhileStack[top_item].line_idx;
-                                  Lexi_pos[input_idx] = 0;
-                                  fseek(Input_stream[input_idx],file_pos,SEEK_SET);
-                                  fgets(Lexi_buf[input_idx],LEX_BUFLEN-1,Input_stream[input_idx]);
-                                  While_idx--;
-                                }
+^{Spaces}"/ENDWHILE"([^\n])*          { 
+                                int i;
+                                LLDBUG_PRL2("[ENDWHILE While_idx=<%d>]\n",IFcount);
+                                IFcount--;
+				end_mode_stream(DEFAULT_DEST,0);
+				for(i=0;i<IFcount;i++) {send("\t",NULL);}
+				send_stream(0,"</while>");
+				send_stream(1,"}");
+				if (IFcount == 0) {
+				  if (watch_mode[current_dest][1]) {
+				    end_streams(DEFAULT_DEST,1);
+ 				  } else {
+				    end_streams(DEFAULT_DEST,0);
+				  }
+                                  change_destination(DEFAULT_DEST);
+				}
+				delete_cache();
                                 BEGIN S_TEXT;
                               }
 "/WHILE"                      |
-^{Spaces}"/WHILE"             { long int file_pos;
-                                int      leng;
-                                LLDBUG_PRL2("[WHILE While_idx=<%d>]\n",While_idx);
-                                leng = strlen(Lexi_buf[Input_idx]);  /* length of current line */
-                                /* <-- because we use fgets() to read input, 
-                                       thus ftell() will give the starting position of next line */
-                                WhileStack[While_idx].input_idx = Input_idx;
-                                file_pos = ftell(Input_stream[Input_idx]);
-                                file_pos -= leng;  /* calibrate the current line length */
-                                WhileStack[While_idx].pos_idx = file_pos;  /* begin of current line */
-                                WhileStack[While_idx].line_idx = Current_line[Input_idx];
-                                While_idx++;  /* advance the stack pointer */
-                                
-                                BEGIN S_TRUE_FALSE_STMT; RETURN(CAPA_WHILE); 
-                                
+^{Spaces}"/WHILE"             { 
+                                int      i;
+                                LLDBUG_PRL2("[WHILE While_idx=<%d>]\n",IFcount);
+                                IFcount++;  /* advance the stack pointer */
+                                BEGIN S_TRUE_FALSE_STMT;
+				if ( IFcount == 1) {
+ 				  start_streams(DEFAULT_DEST, 2);
+                                  change_destination(DEFAULT_DEST);
+				  watch_mode[current_dest][1]=1;
+				}
+				end_mode_stream(DEFAULT_DEST, 0);
+				start_mode_stream(DEFAULT_DEST,1,MODE_SCRIPT,NULL);
+				for(i=1;i<IFcount;i++) {send("\t",NULL);}
+				send_stream(0,"<while condition=\"",NULL);
+				send_stream(1,"while (",NULL);
+				new_cache();
+				start_cache();
                               }
-^{Spaces}"/IF"                { IFcount++; IFcurrent[IFcount] = RUN_IF_PORTION;
-                                LLDBUG_PRL2("[IF <IFcount=%d>]",IFcount);  BEGIN S_TRUE_FALSE_STMT; RETURN(CAPA_IF); }
-^{Spaces}"/ELSE"([^\n])*        { LLDBUG_PRL2("[ELSE <IFcount=%d>]\n",IFcount); 
-                                IFcurrent[IFcount] = RUN_ELSE_PORTION;
-                                if( IFstatus[IFcount] == IF_TRUE ) {
-                                  LLDBUG_PRL1("[ELSE begin Skip]\n");
-                                  BEGIN S_IF_SKIP;
-                                }
+^{Spaces}"/IF"                { int i;
+				IFcount++;
+                                LLDBUG_PRL2("[IF <IFcount=%d>]",IFcount);
+				BEGIN S_TRUE_FALSE_STMT;
+				if ( IFcount == 1) {
+ 				  start_streams(DEFAULT_DEST, 2);
+                                  change_destination(DEFAULT_DEST);
+				  watch_mode[current_dest][1]=1;
+				}
+				end_mode_stream(DEFAULT_DEST, 0);
+				start_mode_stream(DEFAULT_DEST,1,MODE_SCRIPT,NULL);
+				for(i=1;i<IFcount;i++) {send("\t",NULL);}
+				send_stream(0,"<block condition=\"",NULL);
+				send_stream(1,"if (",NULL);
+				new_cache();
+				start_cache();
+			       }
+^{Spaces}"/ELSE"([^\n])*      { int i;
+				LLDBUG_PRL2("[ELSE <IFcount=%d>]\n",IFcount);
+				end_mode_stream(DEFAULT_DEST,0);
+				for(i=1;i<IFcount;i++) {send("\t",NULL);}
+ 				send_stream(0,
+                                      "</block>\n<block condition=\"!(%s)\">",
+				      cached_data[current_cache].str);
+				send_stream(1,"} else {");
                               }
-^{Spaces}"/ENDIF"([^\n])*    { IFcount--; LLDBUG_PRL2("[ENDIF <IFcount=%d>]\n",IFcount); 
+^{Spaces}"/ENDIF"([^\n])*     { int i;
+				IFcount--;
+				end_mode_stream(DEFAULT_DEST,0);
+				for(i=0;i<IFcount;i++) {send("\t",NULL);}
+				send_stream(0,"</block>");
+				send_stream(1,"}");
+				if (IFcount == 0) {
+				  if (watch_mode[current_dest][1]) {
+				    end_streams(DEFAULT_DEST,1);
+ 				  } else {
+				    end_streams(DEFAULT_DEST,0);
+				  }
+                                  change_destination(DEFAULT_DEST);
+				}
+				delete_cache();
+				LLDBUG_PRL2("[ENDIF <IFcount=%d>]\n",IFcount); 
                               }
-"/AND"                        { LLDBUG_PRL1("[AND]"); BEGIN S_ANSCONTINUE; RETURN(ANS_AND); }
+"/AND"                        { LLDBUG_PRL1("[AND]"); /*implict in LON-CAPA*/}
 "/DIS"                        { /* since S_VARIABLE treat {Space} as null, so here we do not match ( */
                                 /* so that between /DIS and ( can have as many {Space} as we want */
                                 LLDBUG_PR1("[DIS<]");
@@ -506,7 +579,7 @@ EndLine    ([\r][\n]|[\n])
                               }
 "/OR"                         { LLDBUG_PRL1("[OR]"); BEGIN S_ANSCONTINUE;  RETURN(ANS_OR); }
 {EndLine}                     { LLDBUG_PR1("[EoL within S_TEXT]\n"); /* end of the whole text line */ 
-                                send("\n"); }
+                                send("<br />\n"); }
 [\\]{Space}*{EndLine}         { LLDBUG_PR2("[\\EoL continue](%s)",yytext); /* continuation on next line */ }                       
 ^{Spaces}"//"[^\n]*$		      { LLDBUG_PRL2("[COMMENT<%s>]\n",yytext);
                                         start_mode(MODE_SCRIPT,NULL); 
@@ -629,8 +702,6 @@ EndLine    ([\r][\n]|[\n])
 <S_HINT,S_EXPLAIN>{
 [/][Dd][Ii][Ss]{Space}*[\(]{Space}*  {  yy_push_state(S_HINTEXLAINX); }
 [^/\n]+[/\\]                    { char  *aptr = yytext;
-                                  int    ii;
-                                
                                   yyless(yyleng-1);
 				  send(aptr);
                                 }
@@ -638,19 +709,20 @@ EndLine    ([\r][\n]|[\n])
 [\\]                           { send("\\"); }
 [\\]{Space}*[\n]               { LLDBUG_PR1("[\\CR hint explain continue]"); /* Hint and explain continuation */ }
 [^/\n\\]+$                     {char  *aptr = yytext;
-                                int    ii;
-				send(aptr);
+                                send(aptr);
                                }
 }
 <S_HINT>{
 {EndLine}                     {  LLDBUG_PR1("[CR hint]");
                                  send("\n"); 
+                                 change_destination(DEFAULT_DEST);
                                  BEGIN S_TEXT;
                               }
 }
 <S_EXPLAIN>{
 {EndLine}                     {  LLDBUG_PR1("[CR explain]");
                                  send("\n"); 
+                                 change_destination(DEFAULT_DEST);
                                  BEGIN S_TEXT;
                               }
 }
@@ -662,8 +734,26 @@ EndLine    ([\r][\n]|[\n])
 }
 
 <S_IMPORT>{
-{FileName}{Space}*             { end_mode();send("<import>/res/ohiou/%s</import>\n",yytext); BEGIN S_SKIP; }
-{Identifier}{Space}*           { end_mode();send("<import>$%s</import>\n",yytext);  BEGIN S_SKIP; }
+{FileName}{Space}*             { char *endquote;
+                                 end_mode();
+				 start_mode(MODE_IMPORT,NULL);
+				 /* Get rid of leading and trailing quotes */
+				 endquote = strrchr(yytext,'\"');
+                                 *endquote = '\0';
+                                 if (yytext[1] == '/') {
+                                    send("%s%s",import_prefix,&yytext[1]);
+                                 } else {
+                                    send("%s",&yytext[1]);
+                                 }
+				 end_mode();
+				 BEGIN S_SKIP;
+                               }
+{Identifier}{Space}*           { end_mode();
+				 start_mode(MODE_IMPORT,NULL);
+				 send("$%s",yytext);
+				 end_mode();
+                                 BEGIN S_SKIP;
+			       }
 }
 
 <S_ANSWER>{
@@ -685,7 +775,7 @@ EndLine    ([\r][\n]|[\n])
 [,=]                  { LLDBUG_PR2("[symbol(%s)]",yytext);}
 [%]                  { LLDBUG_PR2("[symbol(%s)]",yytext); 
                        if (dosend==1) send("%s",yytext);
-                       if (dosend==2) add_delayed("%s",yytext);
+                       if (dosend==2) add_delayed("%%%s",yytext);
                      }
 [:@#-]                  { LLDBUG_PR2("[symbol(%s)]",yytext); 
                           if (dosend==1) send("%s",yytext);
@@ -701,27 +791,39 @@ EndLine    ([\r][\n]|[\n])
                              }
 
 [Pp][Cc][Rr]                 |
-[Hh][Gg][Rr]                 { if (firstparam) firstparam=0; else add_delayed("\" />\n\t");
+[Hh][Gg][Rr]                 { if (firstparam) {
+				firstparam=0; 
+			       } else {
+				add_delayed("\" />\n\t");
+			       }
                                add_delayed("<responseparam name=\"hgr\" type=\"on|off\" default=\""); 
                                dosend=2;
                              }
 [Tt][Oo][Ll]                 { LLDBUG_PR2("[tol(%s)]",yytext);
-                               if (firstparam) firstparam=0; else add_delayed("\" />\n\t");
+                               if (firstparam) {
+				 firstparam=0; 
+			       } else {
+				 add_delayed("\" />\n\t");
+			       }
 			       add_delayed("<responseparam name=\"tol\" type=\"tolerance\" description=\"Numerical Tolerance\" default=\""); 
                                dosend=2;
                              }
 [Ss][Ii][Gg]                 { 
                                LLDBUG_PR2("[SIG(%s)]",yytext); 
-                               if (firstparam) firstparam=0; else add_delayed("\" />\n\t");
-			       add_delayed("<responseparam name=\"sig\" type=\"int,range,0-12\" description=\"Significant Figures\" default=\""); 
+                               if (firstparam) {
+				 firstparam=0; 
+			       } else {
+				 add_delayed("\" />\n\t");
+			       }
+			       add_delayed("<responseparam name=\"sig\" type=\"int_range,0-12\" description=\"Significant Figures\" default=\""); 
                                dosend=2;
                              }
 
-[Ss][Tt][Rr]                 { LLDBUG_PR1("[STR]"); send("\" str=\""); dosend=1; }
+[Ss][Tt][Rr]                 { LLDBUG_PR1("[STR]"); send("\" type=\""); dosend=1; }
 [Ee][Vv][Aa][Ll]             |
 [Ee][Vv][Aa][Ll][Uu][Aa][Tt][Ee] { LLDBUG_PR1("[EVAL]");send("\" eval="); dosend=1;}
 [Uu][Nn][Ii][Tt]             |
-[Uu][Nn][Ii][Tt][Ss]         { LLDBUG_PR1("[UNIT]"); send("\" units=\""); dosend=1;}
+[Uu][Nn][Ii][Tt][Ss]         { LLDBUG_PR1("[UNIT]"); send("\" unit=\""); dosend=1;}
 
 [Ee][Xx][Tt][Ee][Rr][Nn][Aa][Ll]  { LLDBUG_PR1("[EXTERNAL]"); dosend=0; }
 [Aa][Nn][Ss][Bb][Oo][Xx]     { LLDBUG_PR1("[SHOW_ANS_BOX]"); dosend=0; }
@@ -743,8 +845,23 @@ EndLine    ([\r][\n]|[\n])
                                send("\">\n\t");
 			       dosend=1;
 			       flush_delayed();
-			       if (!firstparam) send("\" />");
-			       send("\n\t<textline />\n</numericalresponse>\n");
+			       if (firstparam!=1) send("\" />\n");
+			       send("\t<textline />\n");
+                         /* Fill in Hints */ 
+			       if ( !is_dest_empty(HINT_DEST) ) {
+			         send("<hintgroup>\n\t<hintpart on=\"default\">\n\t<startouttext />");
+                                 end_streams(HINT_DEST,0);
+                                 HINTflag=0;
+                                 send("\t<endouttext />\n\t</hintpart>\n</hintgroup>\n");
+			       }
+			       send("\n</numericalresponse>\n");
+
+			       if ( !is_dest_empty(EXP_DEST) ) {
+			         send("<postanswerdate>\n\t<startouttext />\n");
+                                 end_streams(EXP_DEST,0);
+                                 EXPflag=0;
+                                 send("\t<endouttext />\n</postanswerdate>\n");
+                               }
                              }
 }
 
@@ -759,22 +876,12 @@ EndLine    ([\r][\n]|[\n])
                                  if (dosend==2) add_delayed("&%s",yytext);
 				 Pcount++;
                                }
-{Alpha}{AlphaNum}*{Space}*[\[]  {  char aline[MAX_FUNC_NAME];
-                                   int  i;   
-                                   for(i=0;i < (yyleng-1); i++) {
-                                     if( yytext[i] == ' ' || yytext[i] == '\t' || 
-                                         yytext[i] == 0   || yytext[i] == '[' )    break;
-                                     aline[i] = yytext[i];
-                                   }
-                                   aline[i] = 0;
-                                   LLDBUG_PR2("[ARRAY<%s>]",aline);
-                                   
-                                   yylval = (Symbol *) capa_malloc(1, sizeof(Symbol)); /* *** */
-                                   yylval->s_name = strsave(aline); /* free it in parser() */
-                                   yylval->s_type = ARRAY_ID;
+{Alpha}{AlphaNum}*{Space}*[\[]  {
+                                   LLDBUG_PR2("[ARRAY<%s>]",yytext);
                                    
-                                   yyless(yyleng-1); /* <-- push back char '[' */
-                                   RETURN(ARRAY_ID);
+                                   yyless(yyleng-1); /*<-- push back char '[' */
+                                   if (dosend==1) send("$%s",yytext); 
+                                   if (dosend==2) add_delayed("$%s",yytext); 
                                }
 {Number}*"\."{Number}*[Ee]"+"{Number}+ |
 {Number}*"\."{Number}*[Ee]{Number}+    |
@@ -792,8 +899,14 @@ EndLine    ([\r][\n]|[\n])
                              if (dosend==1) send("%s",yytext);
                              if (dosend==2) add_delayed("%s",yytext);
 			  }
-[\[]                      { LLDBUG_PR1("[dis let ans map '[']");         return(yytext[0]); }
-[\]]                      { LLDBUG_PR1("[dis let ans map ']']");         return(yytext[0]); }
+[\[]                      { LLDBUG_PR1("[dis let ans map '[']");
+			    if(dosend==1) send("%s",yytext);
+			    if(dosend==2) add_delayed("%s",yytext);
+			  }
+[\]]                      { LLDBUG_PR1("[dis let ans map ']']");
+			    if(dosend==1) send("%s",yytext);
+			    if(dosend==2) add_delayed("%s",yytext);
+			  }
 {Space}+                  { /* LLDBUG_PR1("[SP ignored]");  Ignore Spaces */ }
 }
 
@@ -813,7 +926,7 @@ EndLine    ([\r][\n]|[\n])
 }
 
 <S_VARIABLE,S_TRUE_FALSE_STMT,S_MAP,S_ANSWER>{
-[\(]                      { LLDBUG_PR1("[dis let ans map (]"); 
+[\(]                      { LLDBUG_PR1("[let if ans map (]"); 
                             Pcount++; 
 			    if (Pcount > 1 ) {
 			      if (dosend==1) send(yytext);
@@ -823,7 +936,7 @@ EndLine    ([\r][\n]|[\n])
 }
 
 <S_LET>{
-[\(]                      { LLDBUG_PR1("[dis let ans map (]"); 
+[\(]                      { LLDBUG_PR1("[let (]"); 
                             Pcount++; 
 			    send(yytext);
                           }
@@ -881,6 +994,7 @@ EndLine    ([\r][\n]|[\n])
 			 BEGIN S_ECHO;
                       }
                     }
+[%]                 {send("%%");}
 {Operator}          { LLDBUG_PR2("[Op(%c) in VAR,TF_STMT,LET]",yytext[0]); send(yytext); }
 }
 
@@ -905,10 +1019,24 @@ EndLine    ([\r][\n]|[\n])
 }
 
 <S_TRUE_FALSE_STMT>{
-[\)]                     { LLDBUG_PRL1("[) in TRUE_FALSE]"); Pcount--; if(Pcount == 0)  BEGIN S_NEXT_LINE; return(yytext[0]); }
-[\\]{Space}*{EndLine}    { LLDBUG_PR2("[\\EoL continue in S_TRUE_FALSE_STMT](%s)",yytext); /* continuation on next line */ }                       
-{EndLine}                { LLDBUG_PR1("[EoL within /IF()]\n"); RETURN(EoL); }
-.                   { char warn_msg[WARN_MSG_LENGTH]; 
+[\)]                     { 
+                           LLDBUG_PRL1("[) in TRUE_FALSE]");
+			   Pcount--; 
+			   if(Pcount == 0)  {
+				stop_cache();
+				send_stream(0,"\">\n");
+				send_stream(1,") {\n");
+				BEGIN S_NEXT_LINE;
+			   }
+			 }
+[\\]{Space}*{EndLine}    { 
+			   LLDBUG_PR2("[\\EoL continue in S_TRUE_FALSE_STMT](%s)",yytext); /* continuation on next line */ 
+			 }                       
+{EndLine}                { 
+			   LLDBUG_PR1("[EoL within /IF()]\n"); RETURN(EoL);
+			 }
+.                   { 
+		      char warn_msg[WARN_MSG_LENGTH]; 
                       sprintf(warn_msg,"In /IF(), an unexpected char [%c] is encountered.\n",yytext[0]);
                       capa_msg(MESSAGE_ERROR,warn_msg);
                     }
@@ -925,6 +1053,9 @@ EndLine    ([\r][\n]|[\n])
                       send("'");
 		      yy_pop_state();
 		    }
+[%]                 { /*Escape percent signs so that vasprintf doesn't choke */
+                      send("%%");
+                    }
 {EndLine}           { /* check for termination of string constant */
                       char warn_msg[WARN_MSG_LENGTH];
                       
@@ -991,41 +1122,10 @@ EndLine    ([\r][\n]|[\n])
 [\\]{Space}*{EndLine}    { /* continuation */ }
 {EndLine}                { /* end of answer and/or other answers */ LLDBUG_PR1("[complete an answer<EoL>]"); 
                            BEGIN S_TEXT; }
-"/AND"                   { LLDBUG_PR1("[AND]"); RETURN(ANS_AND); }
+"/AND"                   { LLDBUG_PR1("[AND]"); /* implicit in LON-CAPA */ }
 "/OR"                    { LLDBUG_PR1("[OR]");  RETURN(ANS_OR);  }
 }
 
-<S_IF_SKIP>{
-^{Spaces}"/IF"[^\n]*{EndLine}    { IFcount++; LLDBUG_PRL2("[Skip IF <IFcount=%d>]\n",IFcount); 
-                                   IFstatus[IFcount] = IF_DONT_CARE;
-                                 }
-^{Spaces}"/ELSE"[^\n]*{EndLine}  {  LLDBUG_PRL2("[Skip ELSE <IFcount=%d>]",IFcount);
-                            IFcurrent[IFcount]=RUN_ELSE_PORTION; 
-                            if( IFstatus[IFcount] == IF_FALSE ) {
-                               LLDBUG_PRL1("[ELSE begin TEXT CR]\n");
-                               BEGIN S_TEXT;
-                            } 
-                            if( IFstatus[IFcount] == IF_TRUE ) {
-                               LLDBUG_PRL1("[ELSE THIS SHOULD NEVER HAPPEN.]\n");
-                            }
-                         }
-^{Spaces}"/ENDIF"[^\n]*{EndLine} { IFcount--; LLDBUG_PRL2("[Skip ENDIF <IFcount=%d>]\n",IFcount);
-                            if( IFcount == 0 ) {
-                               LLDBUG_PRL1("[ENDIF begin TEXT CR]\n");
-                               BEGIN S_TEXT;
-                            }
-                            if( (IFcurrent[IFcount] == RUN_IF_PORTION )&&(IFstatus[IFcount] == IF_TRUE)) {
-                               LLDBUG_PRL1("[ENDIF begin TEXT CR]\n");
-                               BEGIN S_TEXT;
-                            }
-                            if( (IFcurrent[IFcount] == RUN_ELSE_PORTION )&&(IFstatus[IFcount] == IF_FALSE)) {
-                               LLDBUG_PRL1("[ENDIF begin TEXT CR]\n");
-                               BEGIN S_TEXT;
-                            }
-                         }
-{EndLine}                { LLDBUG_PRL1("[SkipIF a CR]\n");       }
-[^\n]*$                  { LLDBUG_PRL2("[SkipIF anything <IFcount=%d>]",IFcount);   }
-}
 <S_NEXT_LINE>{
 ([.]*){EndLine}          { /* this ignores everything until it hits an EoL */
                            LLDBUG_PRL2("[<S_NEXT_LINE> skip \'%s\' until EoL]\n",yytext); 
@@ -1062,8 +1162,6 @@ EndLine    ([\r][\n]|[\n])
 %%
 
 /* ========================================================================================== */
-extern void
-begin_if_skip() { BEGIN S_IF_SKIP; }
 
 extern void
 begin_while_skip() { Wcount=0; While_idx--; /* while is FALSE, pop it out from stack */ BEGIN S_WHILE_SKIP; }