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|
PROGRAM Wsltex;
{
**********************************************************************
Copy an 8-bit file to a 7-bit file, turning characters with bit 8
set into 4-character octal escape sequences \nnn. This is useful in
analyzing WordStar microcomputer word processor files. Many
sequences which can be recognized as doing something useful are
turned into LaTeX command sequences. Comments below describe the
sequences which are recognized and translated.
Usage:
@WSLTEX
Old 8-bit file: filespec
New 7-bit file: filespec
[11-Oct-85]
**********************************************************************
}
{ ^L }
CONST
nul = 0;
bel = 7;
ht = 9;
lf = 10;
ff = 12;
cr = 13;
esc = 27;
maxring = 256; { limit for character ring }
maxspecial = 100; { limit for warning when special strings (underline,
bold, etc) exceed this length }
unset = MAXINT;
VAR
wordstar_file,latex_file : PACKED FILE OF integer;
ring_index : integer;
ring : PACKED ARRAY [0 .. maxring] OF integer;
hyphen_break : boolean;
eol,is_underline,is_subscript,is_superscript,is_bold,
is_alternate : boolean;
bi_eol,bi_underline,bi_subscript,bi_superscript,bi_bold,
bi_alternate : integer;
bo_eol,bo_underline,bo_subscript,bo_superscript,bo_bold,
bo_alternate : integer;
input_byte_offset,output_byte_offset : integer;
empty_count,last_c,c : integer;
{ ^L }
PROCEDURE Warning(s : PACKED ARRAY [k1 .. k2 : integer] OF char;
b1,b2 : integer { output byte range, or unset,unset }
);
VAR k : integer;
BEGIN
Writeln(tty); { !!!! temporary for debugging !!!! }
Writeln(tty); { !!!! temporary for debugging !!!! }
Writeln(tty,'----------------------------------------------------------');
Write(tty,'%');
FOR k := k1 TO k2 DO
Write(tty,s[k]);
Writeln(tty);
if b1 <> unset then
Writeln(tty,' output byte range = ',b1:0,' .. ',b2:0);
Writeln(tty,' input byte offset = ',input_byte_offset);
Writeln(tty,' output byte offset = ',output_byte_offset);
Writeln(tty,' current context = [');
FOR k := ring_index TO maxring DO
Write(tty,Chr(ring[k]));
FOR k := 0 TO ((maxring + ring_index - 1) MOD maxring) DO
Write(tty,Chr(ring[k]));
Writeln(tty);
Writeln(tty,' ]');
Writeln(tty,'----------------------------------------------------------');
Writeln(tty)
END; { Warning }
{ ^L }
PROCEDURE W_byte(c : integer);
BEGIN
ring[ring_index] := c;
ring_index := (ring_index + 1) MOD maxring;
latex_file^ := c;
eol := (c = lf);
Put(latex_file);
output_byte_offset := output_byte_offset + 1;
IF eol THEN
BEGIN
bi_eol := input_byte_offset;
bo_eol := output_byte_offset
END
END; { W_byte }
PROCEDURE W_char(c : char);
BEGIN
W_byte(Ord(c))
END; { W_char }
{ ^L }
PROCEDURE W_octal;
BEGIN
W_byte(Ord('\'));
W_byte((wordstar_file^ DIV 64) + Ord('0'));
W_byte(((wordstar_file^ DIV 8) MOD 8) + Ord('0'));
W_byte((wordstar_file^ MOD 8) + Ord('0'))
END; { W_octal }
{ ^L }
PROCEDURE W_string(s : PACKED ARRAY [k1 .. k2 : integer] OF char);
VAR k : integer;
BEGIN
FOR k := k1 TO k2 DO
W_byte(Ord(s[k]))
END; { W_string }
{ ^L }
PROCEDURE Begin_alternate;
BEGIN
IF is_alternate THEN
Warning(
'BEGIN ALTERNATE CHARACTER SET command encounted inside alternate sequence',
bo_alternate,output_byte_offset);
bi_alternate := input_byte_offset;
bo_alternate := output_byte_offset;
is_alternate := true;
W_string('{\alt ')
END; { Begin_alternate }
{ ^L }
PROCEDURE Begin_boldface;
BEGIN
IF is_bold THEN
Warning('BEGIN BOLDFACE command encountered inside boldface',
bo_bold,output_byte_offset);
bi_bold := input_byte_offset;
bo_bold := output_byte_offset;
is_bold := true;
W_string('{\bf ')
END; { Begin_boldface }
{ ^L }
PROCEDURE End_alternate;
BEGIN
IF is_alternate THEN
BEGIN
IF (bo_alternate + maxspecial) < output_byte_offset THEN
Warning('Long ALTERNATE CHARACTER SET sequence',
bo_alternate,output_byte_offset)
END
ELSE
Warning(
'END ALTERNATE CHARACTER SET command encountered outside alternate text',
bo_alternate,output_byte_offset);
is_alternate := false;
W_byte(Ord('}'))
END; { End_alternate }
{ ^L }
PROCEDURE End_boldface;
BEGIN
IF is_bold THEN
BEGIN
IF (bo_bold + maxspecial) < output_byte_offset THEN
Warning('Long BOLDFACE sequence',bo_bold,output_byte_offset)
END
ELSE
Warning('END BOLDFACE command encountered outside boldface',
bo_bold,output_byte_offset);
is_bold := false;
W_byte(Ord('}'))
END; { End_boldface }
{ ^L }
PROCEDURE Line_feed;
BEGIN { line_feed }
IF hyphen_break THEN { discard line break }
hyphen_break := false
ELSE
BEGIN
IF bo_eol < output_byte_offset THEN { text on line }
W_byte(lf)
ELSE { empty line }
BEGIN
IF last_c <> (128 + cr) THEN
W_byte(lf)
END
END
END; { Line_feed }
{ ^L }
PROCEDURE Superscript;
BEGIN
IF is_superscript THEN { ending old superscript }
BEGIN
IF (bo_superscript + maxspecial) < output_byte_offset THEN
Warning('Long SUPERSCRIPT sequence',
bo_superscript,output_byte_offset);
W_byte(Ord('}'))
END
ELSE { beginning new superscript }
BEGIN
bi_superscript := input_byte_offset;
bo_superscript := output_byte_offset;
W_string('^{')
END;
is_superscript := NOT is_superscript
END; { Superscipt }
{ ^L }
PROCEDURE Subscript;
BEGIN
IF is_subscript THEN { ending old superscript }
BEGIN
IF (bo_subscript + maxspecial) < output_byte_offset THEN
Warning('Long SUBSCRIPT sequence',
bo_subscript,output_byte_offset);
W_byte(Ord('}'))
END
ELSE { beginning new superscript }
BEGIN
bi_subscript := input_byte_offset;
bo_subscript := output_byte_offset;
W_string('_{');
END;
is_subscript := NOT is_subscript
END; { Subscript }
{ ^L }
PROCEDURE Underline;
BEGIN
IF is_underline THEN { ending old underline }
BEGIN
IF (bo_underline + maxspecial) < output_byte_offset THEN
Warning('Long UNDERLINE sequence',
bo_underline,output_byte_offset);
W_byte(Ord('}'))
END
ELSE { beginning new underline }
BEGIN
bi_underline := input_byte_offset;
bo_underline := output_byte_offset;
W_string('{\em ')
END;
{ underlined text is \emphasized in LaTeX }
is_underline := NOT is_underline
END; { Underline }
{ ^L }
BEGIN { Main -- WSLTEX }
Rewrite(output,'tty:');
Write('Input WordStar 8-bit file: ');
Reset(wordstar_file,'':@,'/e/b:8');
Write('Output LaTeX 7-bit file: ');
Rewrite(latex_file,'':@,'/e/b:7');
{ Initializations -- in alphabetical order }
bi_alternate := -1;
bi_bold := -1;
bi_subscript := -1;
bi_superscript := -1;
bi_underline := -1;
bo_alternate := -1;
bo_bold := -1;
bo_subscript := -1;
bo_superscript := -1;
bo_underline := -1;
eol := true;
hyphen_break := false;
input_byte_offset := -1;
is_bold := false;
is_subscript := false;
is_superscript := false;
is_underline := false;
last_c := -1;
output_byte_offset := -1;
for ring_index := 0 to maxring do
ring[ring_index] := ord(' ');
ring_index := 0;
{
========================================================================
WordStar makes heavy use of the 8-th (high-order) bit of 8-bit ASCII
characters. In general, it turns on that bit for
-- any character (0..127) at end-of-word
-- any character (0..127) at end-of-line
-- "hard" line break on CTL-M
-- "hard" page break on CTL-L
A discretionary hyphen (which can be removed on joining the lines) at
end-of-line is encoded as "-\215" (i.e. "-<\200|CTL-M>").
A required hyphen falling at end-of-line is encoded as "-\040\215" (i.e.
followed by a space).
Comment lines and WordStar command lines begin with a dot.
"Hard" line breaks are encoded as \215\015 (i.e. "<\200|CTL-M><CTL-J>");
these occur between double-space lines.
"Soft" line breaks are encoded as <CTL-M><CTL-J>; these occur at
paragraph ends.
Centered text is stored centered without any special markings.
Underlined text is bracketed by CTL-S.
Boldface text is bracketed by CTL-E ..text.. CTL-R.
Superscripts are bracketed by CTL-T.
Subscripts are bracketed by CTL-V.
Alternate typewheel strings appear as CTL-Q ..text.. CTL-W. Some of
these at least are mnemonic (e = epsilon, m = mu, . = centered dot).
CTL-R also appears after all sub/superscript sequences, apparently
functioning as a "return to normal" state.
========================================================================
}
c := wordstar_file^;
WHILE NOT Eof(wordstar_file) DO
BEGIN
IF c < 32 THEN { ordinary control character }
BEGIN
CASE c OF
0,1,2,3,4 : { CTL-@ .. CTL-D }
W_octal;
5 : { CTL-E }
Begin_boldface;
6,7,8 : { CTL-F .. CTL-H }
W_octal;
9 : { CTL-I }
W_byte(ht);
10 : { CTL-J }
Line_feed;
11 : { CTL-K }
W_octal;
12 : { CTL-L }
W_byte(ff);
13 : { CTL-M }
IF last_c = Ord('-') THEN
hyphen_break := true
ELSE IF NOT hyphen_break THEN
W_byte(cr);
14,15,16 : { CTL-N .. CTL-P }
W_octal;
17 : { CTL-Q }
Begin_alternate;
18 : { CTL-R }
IF is_bold THEN
End_boldface;
{ ELSE discard character }
19 : { CTL-S }
Underline;
20 : { CTL-T }
Superscript;
21 : { CTL-U }
W_octal;
22 : { CTL-V }
Subscript;
23 : { CTL-W }
End_alternate;
24,25,26,27,28,29,30,31 : { CTL-X .. CTL-_ }
W_octal
END { case }
END
ELSE IF chr(c) IN ['#','$','%','&','~','_','^','\','{','}']
THEN { LaTeX special characters must be quoted by backslash }
BEGIN
W_char('\');
W_byte(c)
END
ELSE IF c = Ord('.') THEN { check for WordStar comment }
BEGIN
IF eol THEN
W_string('%-WS-% ');
W_byte(c)
END
ELSE IF c < 128 THEN { c in 32 .. 127 }
W_byte(c)
ELSE { c > 127 }
BEGIN
c := c - 128; { lop off 8-th bit }
CASE c OF
0 : { CTL-@ }
W_octal;
1 : { CTL-A }
W_octal;
2 : { CTL-B }
W_octal;
3 : { CTL-C }
W_octal;
4 : { CTL-D }
W_octal;
5 : { CTL-E }
Begin_boldface;
6 : { CTL-F }
W_octal;
7 : { CTL-G }
W_octal;
8 : { CTL-H }
W_octal;
9 : { CTL-I }
W_byte(ht);
10 : { CTL-J }
Line_feed;
11 : { CTL-K }
W_octal;
12 : { CTL-L }
W_byte(ff);
13 : { CTL-M }
IF last_c = Ord('-') THEN
hyphen_break := true
ELSE IF NOT hyphen_break THEN
BEGIN
IF bo_eol < output_byte_offset THEN { not double space}
W_byte(cr);
END;
14 : { CTL-N }
W_octal;
15 : { CTL-O }
W_octal;
16 : { CTL-P }
W_octal;
17 : { CTL-Q }
Begin_alternate;
18 : { CTL-R }
IF is_bold THEN
End_boldface;
{ ELSE discard character }
19 : { CTL-S }
Underline;
20 : { CTL-T }
Superscript;
21 : { CTL-U }
W_octal;
22 : { CTL-V }
Subscript;
23 : { CTL-W }
End_alternate;
24 : { CTL-X }
W_octal;
25 : { CTL-Y }
W_octal;
26 : { CTL-Z }
W_octal;
27 : { CTL-[ }
W_octal;
28 : { CTL-\ }
W_octal;
29 : { CTL-] }
W_octal;
30 : { CTL-^ }
W_octal;
31 : { CTL-_ }
W_octal;
32,33,34,35,36,37,38,39,40,41,42,43,44,45 :
W_byte(c);
46 : { period }
BEGIN
IF eol THEN
W_string('%-WS-% ');
W_byte(c)
END;
47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63 :
W_byte(c);
64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,
81,82,83,84,85,86,87,88,89,90,91,92,93,94,95 :
W_byte(c);
96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,
111,112,113,114,115,116,117,118,119,120,121,122,123,124,
125,126 :
W_byte(c);
127 :
W_octal;
OTHERS :
W_octal;
END { CASE }
END;
last_c := wordstar_file^;
input_byte_offset := input_byte_offset + 1;
Get(wordstar_file);
c := wordstar_file^
END;
END. { Main -- WSLTEX }
|