Cross is a program that will take a Pascal program, indent it and
produce a cross reference of the indented copy. To use cross type
CROSS
Input file:<Old-Name>
Output file:<New-Name>
Cross file:<Listing Name>
Where <Old-Name> is the name of your Pascal program. <New-name> is the
name the name the file you want the indented program sent to and
<Listing-Name> is the file that the cross reference listing will be
sent to. (LST: is suggested).
Cross will try to properly indent your program. Since many screen editors
will not edit lines longer than 80 characters, Cross will not indent
lines past column 75 if possible. This leaves 5 characters for changes
to the lines. The listing will be properly indented even if the source
has to be moved to the left to avoid column 80.
If CROSS sees a comment beginning with %E it will start a new page.
{%E} is used by Cross the same way {$L+} is used by the Pascal/Z
compiler.
This listing file will contain your Pascal program with line number and
annotation added to it. The annotation will look something like this
B 5 120 Begin
I 6 121 If X>5
T 6 122 Then
B 7 123 Begin
124 X:=6;Y:=2;
E 7 125 End
S 6 126 Else
The B at the left margin signals the start of BEGIN number 5. It will
match end number 5. The I signals the start of IF number 6. It matches
THEN number 6 and ELSE number 6. The other letters are
B Begin
C Case
E End
I If
R Repeat
S Else
T Then
U Until
At the end of your listing there will be a section titled
Cross listing of identifiers
This section will contain all the identifiers used by your program and
were they are used. The where part is of the form <Line number>/<Page number>.
The next section will show a list of your proredures and who calls whom.
The final section will show your procedure nesting.
Known bugs and restrictions:
Cross does not know about Include files. This will not be a problem
as long as your include files do not contain part of a block structure.
(Such as a single END statement).
Cross considers 10 characters significant for variable names. The
Pascal/Z compiler considers only 8.
Cross likes to right justify comments. If you have a comment of the
form
{*------------------------------------------------------*
Text
*------------------------------------------------------*}
Cross will write it as
{*------------------------------------------------------*
Text
*------------------------------------------------------*}
You should write your comments as:
{*------------------------------------------------------*
* Text *
*------------------------------------------------------*}
to avoid this problem.
Notes on the Cross source.
1)Good luck. Cross orginally came from the univeristy of Hamburg. It
is commented in Germain. Have fun. Also the orignal source was made
for a Dec-10 which allowed long lines to be edited. When it was
moved to the Z80 the lines had to be shortened and they were split up
badly. This poses a problem with reading the source.
2)The file CROSS.SUB will make the program CROSS from the sources.
It assumes that the sources and Pascal are on drive A and that
drive B contains a scratch disk.
3)The following paramters can be changed to suit the user.
These are defined in the procedure Options which is located at
the end of the program.
R Right Margin. Cross will try to keep text from going past
this margin.
I Indention. This parameter is the number of spaces that Cross
will indent for every block.
P Printer width. This is the size of the printer in columns.
Cross will cause the listing lines to wrap around if they
go past this margin.
S The number of lines of program text to be listed per page.
4)The following are dummy procedures that you can define if you have
some sort of clock.
P$Time Returns the time as 8 characters.
P$Date Returns the date as 8 characters.
