10000 REM =======================================
10001 REM Quasi-textile processor
10002 REM
10003 REM INPUT - TFILE$    Textile file to read
10004 REM         HFILE$    HTML file to write
10005 REM =======================================
10010 DIM STK$(20)
10020 STKPOS = 0:CLEARALL = 0:POPSTOP = 0
10030 OPEN TFILE$ FOR INPUT AS #1
10040 OPEN HFILE$ FOR OUTPUT AS #2
10050 WHILE(NOT EOF(1))
10060     LINE INPUT#1, LTXT$
10065     PRDTXT$ = ""

10069     REM Pop if a blank line
10070     IF LEN(LTXT$) <= 0 THEN CLEARALL=1:GOSUB 11000:GOTO 10830

10079     REM Look for h1., p., bq., etc.
10080     PRDLOC = INSTR(LTXT$,".")
10083     IF PRDLOC > 1 THEN PRDTXT$ = MID$(LTXT$,1,PRDLOC-1) ELSE GOTO 10099
10085     IF PRDLOC > 3 THEN PRDLOC = -1:PRDTXT$ = "":GOTO 10099
10090     IF PRDTXT$ = "bq" OR PRDTXT$ = "p" OR MID$(PRDTXT$,1,1) = "h" THEN GOTO 10500

10099     REM Look for lists
10100     IF MID$(LTXT$,1,1) <> "*" THEN GOTO 10130 ELSE ISTAR=1:LSTTYPE$="u"
10110     WHILE(MID$(LTXT$,ISTAR+1,1) = "*"):ISTAR=ISTAR+1:WEND
10120     IF MID$(LTXT$,ISTAR+1,1) = " " THEN PRDLOC=ISTAR+1:PRDTXT$="*"+RIGHT$(STR$(ISTAR), LEN(STR$(ISTAR))-1):GOTO 10400

10129     REM Look for numbered lists
10130     IF MID$(LTXT$,1,1) <> "#" THEN GOTO 10160 ELSE ISTAR=1:LSTTYPE$="o"
10140     WHILE(MID$(LTXT$,ISTAR+1,1) = "#"):ISTAR=ISTAR+1:WEND
10150     IF MID$(LTXT$,ISTAR+1,1) = " " THEN PRDLOC=ISTAR+1:PRDTXT$="#"+RIGHT$(STR$(ISTAR), LEN(STR$(ISTAR))-1):GOTO 10400

10160     REM More tests could be here...
10170     GOTO 10600

10400     REM Process a list item
10409     REM First, check if the list is initialized
10410     GOSUB 11500

10500     REM Process the operator - dot operator - pop the whole stack!
10510     CLEARALL = 1:GOSUB 11000
10520     LTXT$ = RIGHT$(LTXT$, LEN(LTXT$) - PRDLOC)
10530     PUSHTXT$ = "##."+PRDTXT$
10540     GOSUB 11300
10550     POPSTOP = 0

10600     REM Process the text itself
10610     LI = 1:LSTART = 1:LASTC$ = " "
10620     WHILE(LI <= LEN(LTXT$))
10630         LC$ = MID$(LTXT$, LI, 1)
10640         IF LC$="_" OR LC$="*" OR LC$=CHR$(34) OR LC$="^" OR LC$="~" OR LC$="@" OR LC$="!" THEN GOTO 10650 ELSE GOTO 10800
10650         LCOPT$ = "##c"+LC$
10660         GOSUB 11200
10664         REM If we're in a link, suppress any character processing
10665         IF LCOPT$ <> LASTOP$ AND LASTOP$ = "##c!" THEN GOTO 10800
10667         REM Links must have a space preceding the !
10668         IF LC$ = "!" AND LASTC$ <> " " THEN GOTO 10800
10670         PUSHTXT$ = MID$(LTXT$, LSTART, LI-LSTART):GOSUB 11300
10680         LSTART=LI+1
10690         IF LCOPT$ = LASTOP$ AND (LCOPT$ = "##c"+CHR$(34) OR LCOPT$="##c!") AND MID$(LTXT$, LI+1, 1) = ":" THEN GOSUB 11400 ELSE LINK$ = ""
10700         IF LCOPT$ = LASTOP$ THEN CLEARALL=0:GOSUB 11000 ELSE PUSHTXT$ = LCOPT$:GOSUB 11300
10800         LI = LI + 1
10805         LASTC$ = LC$
10810     WEND
10820     IF LSTART < LEN(LTXT$) THEN PUSHTXT$=MID$(LTXT$, LSTART):GOSUB 11300
10830 WEND
10840 IF STKPOS > 0 THEN CLEARALL=1:GOSUB 11000
10850 CLOSE#1
10860 CLOSE#2
10870 ERASE STK$
10880 RETURN


11000 REM Stack pop operations sub
11001 REM If CLEARALL is 1, pop everything, otherwise, pop once
11008 IF STKPOS = POPSTOP THEN RETURN
11010 GOSUB 11200
11019 REM HTML building...
11020 IF LEN(LASTOP$) = 0 AND STKPOS > 0 THEN LASTOP$ = "##.p"
11029 REM Inline update
11030 IF MID$(LASTOP$, 1, 3) = "##c" THEN GOSUB 12000:GOTO 11050
11040 IF MID$(LASTOP$, 1, 3) = "##." THEN GOSUB 12500
11050 IF CLEARALL = 1 AND STKPOS > POPSTOP THEN GOTO 11010
11060 RETURN

11200 REM Last stack operator - search for the last stack op
11201 REM Returned as LASTOP$
11210 IF STKPOS = 0 THEN LASTOP$ = "":RETURN
11210 FOR LASTI = STKPOS TO 1 STEP -1
11220     IF LEN(STK$(LASTI)) > 3 AND MID$(STK$(LASTI),1,2) = "##" THEN LASTOP$ = STK$(LASTI):RETURN
11230 NEXT LASTI
11240 LASTOP$ = ""
11250 RETURN

11300 REM Push to the stack
11301 REM PUSHTXT$ contains the item
11310 IF LASTOP$
11310 STKPOS = STKPOS+1
11320 STK$(STKPOS) = PUSHTXT$
11330 RETURN

11400 REM Link handling
11401 REM Assumes line is in LTXT$, LI is the latest search index
11402 REM and the link is returned in LINK$
11410 ISPC = LI+2
11420 WHILE(MID$(LTXT$,ISPC,1) <> " " AND ISPC < LEN(LTXT$))
11430     ISPC = ISPC + 1
11440 WEND
11450 LINK$ = MID$(LTXT$, LI+2, ISPC - (LI+2))
11460 LI = ISPC:LSTART = LI
11470 RETURN

11500 REM List handling
11510 STKSRCH$ = "##."+LSTTYPE$+RIGHT$(STR$(ISTAR), LEN(STR$(ISTAR))-1)
11520 BACKSTK = STKPOS
11530 WHILE(BACKSTK > 0 AND STK$(BACKSTK) <> STKSRCH$):BACKSTK=BACKSTK-1:WEND
11540 IF BACKSTK > 0 THEN POPSTOP = BACKSTK:CLEARALL = 1:GOSUB 11000:GOTO 11580
11549 REM Clear the stack first - new list!
11550 GOSUB 11600:CLEARALL = 1:GOSUB 11000
11560 IF LSTTYPE$ = "u" THEN PRINT#2, "<ul>" ELSE PRINT#2, "<ol>"
11570 PUSHTXT$ = STKSRCH$:GOSUB 11300
11580 POPSTOP = STKPOS
11590 RETURN

11600 REM Parent list handling based on ISTAR
11610 BACKSTK = STKPOS
11620 WHILE(BACKSTK > 0) 
11625     IF LEN(STK$(BACKSTK)) < 4 THEN GOTO 11660
11630     IF MID$(STK$(BACKSTK), 1, 4) <> "##.u" AND MID$(STK$(BACKSTK), 1, 4) <> "##.o" THEN GOTO 11660
11640     NUM = VAL(RIGHT$(STK$(BACKSTK), LEN(STK$(BACKSTK))-4))
11650     IF NUM < ISTAR THEN GOTO 11680
11660     BACKSTK = BACKSTK-1
11670 WEND
11680 POPSTOP = BACKSTK
11690 RETURN

12000 REM Handle an inline operator
12010 BACKSTK = STKPOS:OPARG$ = ""
12020 WHILE(STK$(BACKSTK) <> LASTOP$)
12030     BACKSTK = BACKSTK - 1
12040 WEND
12050 FOR ISTK = BACKSTK+1 TO STKPOS:OPARG$ = OPARG$ + STK$(ISTK):NEXT ISTK
12060 IF LASTOP$ = "##c_" THEN PREOP$ = "<em>":POSTOP$="</em>":GOTO 12200
12070 IF LASTOP$ = "##c*" THEN PREOP$ = "<strong>":POSTOP$="</strong>":GOTO 12200
12080 IF LASTOP$ = "##c^" THEN PREOP$ = "<sup>":POSTOP$="</sup>":GOTO 12200
12090 IF LASTOP$ = "##c~" THEN PREOP$ = "<sub>":POSTOP$="</sub>":GOTO 12200
12100 IF LASTOP$ = "##c@" THEN PREOP$ = "<code>":POSTOP$="</code>":GOTO 12200
12105 IF LASTOP$ = "##c"+CHR$(34) AND CLEARALL=1 THEN PREOP$=CHR$(34):POSTOP$="":GOTO 12200
12110 IF LASTOP$ = "##c"+CHR$(34) AND LEN(LINK$) > 0 THEN PREOP$ = "<a href='"+LINK$+"'>":POSTOP$="</a>":LINK$="":GOTO 12200
12120 IF LASTOP$ = "##c"+CHR$(34) THEN PREOP$ = CHR$(34):POSTOP$=CHR$(34):GOTO 12200
12125 IF LASTOP$ = "##c!" AND CLEARALL=1 THEN PREOP$="!":POSTOP$="":GOTO 12200
12130 IF LASTOP$ = "##c!" AND LEN(LINK$) > 0 THEN PREOP$ = "<a href='"+LINK$+"'><img src='":POSTOP$="'/></a>":LINK$="":GOTO 12200
12140 IF LASTOP$ = "##c!" THEN PREOP$ = "<img src='":POSTOP$="'/>":GOTO 12200
12200 STKPOS = BACKSTK
12210 STK$(STKPOS) = PREOP$ + OPARG$ + POSTOP$
12220 RETURN

12500 REM Handle dot operator - write to output
12510 BACKSTK = STKPOS:OPARG$ = ""
12520 WHILE(BACKSTK > 0 AND STK$(BACKSTK) <> LASTOP$)
12530     BACKSTK = BACKSTK - 1
12540 WEND
12550 FOR ISTK = BACKSTK+1 TO STKPOS:OPARG$ = OPARG$ + " " + STK$(ISTK):NEXT ISTK
12555 WHILE(MID$(OPARG$, 1, 1) = " "):OPARG$ = RIGHT$(OPARG$, LEN(OPARG$)-1):WEND
12560 IF LASTOP$ = "##.p" THEN PREOP$ = "<p>":POSTOP$="</p>":GOTO 12700
12570 IF LASTOP$ = "##.bq" THEN PREOP$ = "<blockquote><p>":POSTOP$="</p></blockquote>":GOTO 12700
12580 IF LASTOP$ = "##.bc" THEN PREOP$ = "<pre><code>":POSTOP$="</code></pre>":GOTO 12700
12590 IF LASTOP$ = "##.pre" THEN PREOP$ = "<pre>":POSTOP$="</pre>":GOTO 12700
12600 IF MID$(LASTOP$,1,4) = "##.h" THEN HD$ = MID$(LASTOP$, 4, 2):PREOP$ = "<"+HD$+">":POSTOP$="</"+HD$+">":GOTO 12700
12610 IF MID$(LASTOP$,1,4) = "##.*" OR MID$(LASTOP$,1,4) = "##.#" THEN PREOP$ = "<li>":POSTOP$="</li>":GOTO 12700
12620 IF MID$(LASTOP$,1,4) = "##.u" THEN PREOP$ = "</ul>":POSTOP$="":OPARG$="":GOTO 12700
12630 IF MID$(LASTOP$,1,4) = "##.o" THEN PREOP$ = "</ol>":POSTOP$="":OPARG$="":GOTO 12700
12700 STKPOS = BACKSTK-1
12710 PRINT#2, PREOP$+OPARG$+POSTOP$
12720 RETURN