OS/2 Professional/OS2PRO194.ISO/os2/prgramer/alpha/alpha.txt

Text File | 1994-01-04 | 36.4 KB | 882 lines

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    * (C) Copyright International Business Machines Corporation 1993. *
    *                 All rights Reserved.                            *
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                           ALPHA V1.8

             Lionel de Lambert - Iunius MMDCCXLIII AUC

                IBM United Kingdom Laboratories Ltd.

                           04 January 1994







This document describes the installation, function and commands of the ALPHA
code analysis and browse programmes which run under the OS/2 operating
system. The languages supported are :-
370 and 386 assembler, PASCAL(Ada), PL/AS(PL/I, REXX), C and FORTRAN.












Alpha V1.7

Introduction.

This programme may be of interest to those people who examine 370, 386
assembler, PASCAL(Ada), PL/AS(PL/I, REXX), C, FORTRAN etc. under OS/2.
This programme was written together with the CMS programme ANALYSE in
order to establish some of the praecognita for the CICS restructure
project.

This programme will provide basic browse functions for all files with a
record size <=256 as well as highlighting specified keywords and allowing
user defined Marker references and flow lines, and for language files
such as 370 & 386 Assemble, PASCAL, PL/AS, C, FORTRAN etc.
ALPHA will also draw branch flow lines from 'Jump/GOTO' instructions
to labels in the  same window, will display the programme call structure,
and expand the procedure call in a secondary window.

The programme is written in PASCAL and MASM for OS/2 using Presentation
Manager calls.


Installation

The minimum requirement is to transfer the binary file 'ALPHA.EXE' to
a directory on your PS/2.

If you want different colours, fonts etc. you can copy the text file
'ALPHA.PRF' to the PS/2 and edit the file. You can also
install the 'Alpha' fonts by transferring the binary file 'ALPHA.FON'
to the PS/2 and using the 'Add font' command of the
Installation menu on the 'Control Panel' on OS/2 V1.3. On OS/2 V2.0 select
 'System Setup'  from 'OS/2 System' and use 'Add' in the 'Edit font' of
the 'Font Palette'.
If you wish to access files from the host then you should also install the
'Transfer_pgm' (ALMCOPY). You can send commands to the
host if you also install a 'Command_pgm' (OS2CMD).


Starting up Alpha

The syntax for starting up the Alpha programme is :-

ìC:\┘ <START> ALPHA <file name> </p <profile name>> </m>

Where the option /m may be specified to cause the programme to be started
minimised. This is intended for use in the 'STARTUP.CMD' file as an
alternative to having the programme in the "Group - main" window, e.g.

START ALPHA /p /m

The option /p may be specified to cause the file of initial values of
colours, font etc. to be read. The default file name for this profile is
'ALPHA.PRF'. This file may be used to set alternative start up values such
as the keyword colours. If a file name is not supplied on the OS/2 command
line then the first display will ask for the file name to be browsed.
The Enter key or Enter button should be used to terminate the string, e.g.

        C:\WORK\TEST.A37<Enter_key>

On OS/2 V1.3 if Alpha is minimised or active with or without a file
allocated and the file manager window is active then a selected
file may be moved from the file manager window by dragging mouse button 2
and releasing it over the Ω icon or main window.
This will cause the new file to be allocated.
On OS/2 V2.0 a file from a Drives window may be dropped on to the Alpha
Icon of the unstarted programme.




note
If the window fails to appear the error, WinGetLastError, is written to the
OUTPUT device. This should be directed to a printer or file e.g.
ALPHA >PRN | >file_name


Description

This programme may be used to browse any file with a record size <=256 and
may also be used with language files such as :-
370, 386 assembler, PASCAL(Ada), PL/AS(PL/I, REXX), C, and FORTRAN
programmes etc. on a PS/2 under OS/2 to help in analysing their structure.

The basic browse functions are :-

1) Home - Move to top of file
2) End - Move to end of file
3) Page_up - scroll up 1 screen
4) Page_down - scroll down 1 screen
5) F7 - scroll up 1/2 screen
6) F8 - scroll down 1/2 screen
7) F19 (Shift+F7) - scroll left 1/2 screen
8) F20 (Shift+F8) - scroll right 1/2 screen
9) The Horizontal and Vertical scroll bars.

The mouse button 1 when pressed will isolate the addressed string using
' ', ',', '+' etc. as separators, and highlight it and all references in
the window or as the file is browsed.
In Locate mode if mouse button 1 is pressed twice (double clicked) then the
isolated string will become a search argument. If mouse button 2 is pressed
once (clicked) then the next occurrence of the search argument will be
located. If mouse button 2 is double clicked then the search will start
at the top of the file.

In Expand mode if mouse button 1 is double clicked then the search string
is assumed to be a label or procedure name and a second window is opened
with the procedure code provided the label/routine name can be found.

Search commands may be issued from the command window, which may be invoked
by the F6 key or the system menu icon Alpha.

When the main window is displayed keywords which are associated with the
file extension will be highlighted using the colours specified in the
profile.

Note
Up to 128 language keywords may be specified with their corresponding
colour and the length of the record to be scanned. Only the first 16
keywords on the line will be highlighted and the search order is the order
specified in the profile. The keyword must be <=12 characters.

The File_type keyword in the profile may be used to introduce extra file
types but the first 6 types are assumed to refer to :- 370 assembler, 386
assembler, PASCAL, PL/AS, C, and FORTRAN in that order. With Flow on for
language files branch flow lines will be drawn from 'Branch/GOTO'
instructions to labels in the same window.

If the profile specifies Read_file=Yes, the default, then the file may be
browsed as soon as the window is opened, performance then improves once
the file is read in.


Note
Only the first 256 characters of a record are read. Once the file is read
in there is an internal switch over. If a locate etc. was in progress at
the time of the switch over the window may not display the line found;
it may be necessary to repeat the command e.g. F5.

If the profile specifies Read_file=No then only 120 records from the file
are read in to storage and scrolling takes place within this buffer unless
F4+Ctrl is pressed when the whole file is read in to memory asynchronously.
As the file is scrolled up/down extra pages are read in to the buffer.
The affect is that on scrolling upwards, after the window is displayed,
there may be a pause (hour glass symbol) while extra data is read in.

Small parts (<=window size) of the file may be remembered and redisplayed
by using the Clipboard function. Drag the mouse with button 1 down over the
lines to be saved and press Ctrl+Insert to save the highlighted lines.
To redisplay the saved lines press Shift+Insert. The lines are displayed
from the cursor position onwards. The highlighted records may be printed
on LPT1 by pressing Insert+Alt.


Function keys

The following keys are effective for the programme:-

Mouse button 1 will isolate and highlight the text. If button 1 is pressed
twice then the highlighted string may then be used as a search argument by
button 2.

Mouse button 2 will scan from the current position to the end of file for
the locate string, i.e. the string isolated by button 1 or by use of a
locate command from the command window (F6).
If the mouse button 2 is pressed twice then the scan will start from the
top of the file.

F1 is the help key.
  F1+Alt will display/hide the current status. {The statement number is
displayed in the TITLE bar. R indicates that the file is being read in
to memory, S indicates that the programme structure is being recorded.}
F2 will change the font. The System Monospaced font is the default font,
unless the Alpha font is installed.
F3 will terminate programme.
F4 will allocate a new file
  F4+Ctrl will read the currently assigned file in to memory.

Note
A separate thread is attached to read in the file whilst the file may
continue to be browsed within the 120 record buffer. The scrolling of the
file will be much faster but there may be some degradation of performance
while the file is read in to store. A maximum of 21,844 records can be read
in if there is enough memory available. When the file is read in there is
a beep of 1760HZ to indicate that the file has been read and one of 880HZ
to idicate that the structure has been recorded, provided that "Quiet=No"
is specified in the profile.

F5 will repeat the previous command
F6 will issue a command.

Note
This window may also be created from the system menu icon Alpha. A child
window is created in to which may be typed the command.

F7 scroll up 1/2 screen.
F8 scroll down 1/2 screen.
F9 switch on/off comment suppression.
    A sequence of blank or comment lines will be compressed to a single line
    of  provided that he file is read in. The comment lines must begin with
    characters specified in Comment_start and end with the characters
    specified in Comment_end.
F10 not used.
F11 not used.
F12 will move the mouse button 1 focus line {The line on which mouse button
     1 was last pressed.} to the centre of screen.
  F12+Ctrl will switch on/off the scale line in the centre of the window.
F13 (shift+F1) will display the programme structure.
F14 (shift+F2) will change the text colours.
F17 (shift+F5) will locate the next Marker.
F19 (Shift+F7) will scroll left 1/2 line.
F20 (shift+F8) will scroll right 1/2 line.
F24 (shift+F12) will reset the horizontal scroll, clear line markers etc.
Page_Up will scroll up one page.
Page_Down will scroll down one page.
Home key will move to top of file.
End  key will move to end of file.
Insert+Ctrl will place mouse Button 1 drag area in Clipboard.
Insert+Shift will copy Clipboard text to mouse Button 1 position - cursor.
Insert+Alt will write the highlighted records to LPT1.
Delete+Ctrl will remove the highlighted records, mouse button 1 display
area, from the window display.
Delete+Shift will restore the deleted records.
The Up & Down arrow keys will move the cursor.
The scroll arrows, slider etc. and Page up or Page down keys may be used
for browsing.

Note
If the mouse button 1 is kept depressed on the scroll bar arrows then the
lines or characters will scroll until the button is released.
If the file is not read in then the file size is estimated by adding 1000
every time the internal array is filled.
In this case the slider may move to the end of the vertical scroll bar
before end_of_file is reached and then move up.

Enter key will terminate an input string or refresh the screen.

Help window
This window may be invoked by the F1 key or the Help button on the command
window. The window may be scrolled by :-

Page_up - scroll up 1 screen
Page_down - scroll down 1 screen
Home - scroll to the top of the Help data
End - scroll to the end of the Help data
F7 - scroll up 1/2 screen
F8 - scroll down 1/2 screen
The Page_Up key word at the bottom of the window will scroll up 1 screen if
selected by mouse button 1.
The Page_Down key word at the bottom of the window will scroll down 1
screen if selected by mouse button 1.
The OS/2 help file, ALPHA.HLP, may be accessed by selecting '?' from
the system menu.

The Help window may be cancelled by F3, the Cancel button or by Enter.



Allocate window
The File Allocate window will be created by the F4 key or from the Allocate
menu item of the command window. The file may be selected from the List box
or typed in to the Entry box. The drive may be changed by selecting ¿aα from
the List box or typing the drive letter followed by a ':' e.g. 'a:' in the
Entry box. The Path may be changed by selecting a directory name from the
List box or by typing the path name in the Entry box e.g. 'C:\WORK'.
The COMBO box will hold the last three allocate texts which have been
entered.

A host file may be received and allocated by entering
'>H:fn ft fm PC_file_name'; this string is passed to Transfer_pgm (ALMCOPY)
{without the '>' and with '/Q' appended} which must be installed on the PS/2.
If Transfer_pgm fails the return code is displayed in red and the Entry text
is left to be edited. If the requested file can not be allocated then the
allocate window together with an error message will be displayed.

A host command may be executed by entering '<host command'; this string is
passed to Command_pgm (OS2CMD) {without the '<'} which must be installed
on the PS/2.

If the DosExecPgm call fails for either OS2CMD or ALMCOPY then the error
code is displayed in black.

Note
If the Allocate window can not be contained in the main window then it will
be made sysmodal; i.e. it must be closed before other windows can be used.
For 8515 type screens a more suitable value for the Window and Default_chr
keywords in the profile might be Window=(0,120,1020,650) and
Default_chr=(14,20) for example.

Command window
This window may be invoked by the F6 key or the system menu icon Alpha.

The following commands may be issued :-
+n - scroll down n lines
-n - scroll up n lines
<n - scroll left n characters
>n - scroll right n characters
:n - go to record n
/ - Search for string, not case dependent, from the current position in the
     file.
" - Search for string, as typed, from the current position in the file
' - Search for string, as typed, from the current position in the file but
    only in column 1
(s-e)>file_name - will copy records from the current file starting at s and
    ending with e to the file file_name.
    file_name may be 'LPT2' etc., an existing file or a new file.
   If the end record number is '*'  then the file is copied to end-of-file.
(s-e)- - will remove the records from the window.
 will cycle through the last 6 commands.
The Delete|Backspace key will delete a character from the input text.

If the first character is invalid then the line will be filled red until it
is deleted.

F3 or ENTER will close the window and enter the command.

The cancel button will remove the window; only this child window will
receive input until it is terminated.

The Flow button will switch on/off the drawing of flow lines. These lines
are drawn for language files from 'Branch/GOTO' instructions to labels
within the window.

The Expand/Locate button will switch on/off the label expansion. The
isolated label is expanded by locating the routine and opening a second
window containing the code. The mouse button 1 must be pressed twice
(double clicked) to cause the label to be located. A depth of 8 expand
windows is allowed, and each window may be scrolled using the scroll bar,
Page_Up, Page_Down, etc.
The file must be read in to storage to use this facility. The Expand window
may be closed by F3 or the CALL menu item when the main window will remain
at the CALL. If the Routine menu is clicked then the main window will
scroll to the expand text, i.e. the called code line may be passed back to
the higher level window. The Locate menu or F6 will perform a case
sensitive forward search from the current line+1.
F5 will repeat the previous locate. If Button 2 is double clicked after
moving to the expanded label then the window will be moved back to the
previous line, i.e. return to point of call.
The label searched for is succeeded by ":" for PLS and preceded by
"FUNCTION" or   "PROCEDURE" in PASCAL. The label searched for is preceded
by "char", "extern", "far", "int", "long", "pascal", "pointer", "short",
"static" or "void" if the language type is C. The label searched for is
preceded by "FUNCTION" or "SUBROUTINE" if the language type is FORTRAN.
(The language keywords may be specified by the Language_operator keyword
in the profile. The C language values, language 5, may be set by the
Precedent_C keyword in the profile.)

The Mark button will switch on/off the drawing of user flow lines defined
by the mouse button 1, or the setting of a marker. Up to 16 user lines or
markers may be associated with the file. If mouse button 1 is double clicked
then a marker will be associated with the line. If mouse button 1 is pressed
once then it will delimit the ends of a flow line. The markers or flow
lines remain associated with the record until F24 (Shift+F12) is pressed.
The markers enable places within the file to be remembered and recalled by
(Shift+F5).

The Options menu may be selected to change the state of the following
options :-

Transient Options - reset when a new file is allocated.

Comment Suppression - replace a block of comment lines by one highlighted
line of .
Scale - place a scale line in the middle of the window.
Statement_# - will display the current line number in the TITLE bar.
Status - indicate in the top left of the window the current status of file
reading etc.

Permanent Options - remain set when a new file is allocated.

Quiet - suppress the beep which indicates that the file is read in to
storage.
Read_file_when_allocated - when the file has been allocated read it in to
storage by attaching a subtask. The file may be browsed whilst this is in
progress but the reading of the file in to storage will be slower.
Record_structure - For language files this will cause the recording of the
calling structure when the file has been read.
Tab - recognize tab characters, X'09', and skip to n*8.
Proportional - use the font spacing for writing the characters rather than
the character size; this will allow proportional fonts to be used however
these are not suitable for displaying code.
Keyword - allow or suppress the keyword highlighting.

The Allocate menu will create the Allocate window

The Structure menu may be used to display the call structure for 370,
386 assembler, PASCAL, PL/AS, C and FORTRAN programmes provided that the
Record_structure option is effective when the file is read in.
For 370 assembler the structure is based on BAL, BAS, DFHSTACK,
for 386 assembler CALL, PROC instructions, for PASCAL PROCEDURE,
FUNCTION, keywords, for C char, extern, far, int, long,
pascal, pointer, short, static or void keywords, for PL/AS PROC,
CALL, keywords, and for FORTRAN FUNCTION, SUBROUTINE, CALL
keywords {Labels ƒ27 characters are ignored}. The C language keywords
may be specified by the Precedent_C keyword in the profile, and the operators
for the other languages by the Language_operator keyword.
If an entry is selected from the Programme Structure List Box then the
main window is scrolled to that line.
The Print button may be used to print the contents of the List box on LPT1.

The Font menu may be used to dynamically change the font and character size;
the change is not saved in the profile.

The Colour  menu may be used to dynamically change the text colours. The
language keyword colours must be specified in the profile.

FONTs
You can specify the initial/default font in the profile by using the Font
keyword in the profile, or you can change the font dynamically by invoking
the Font window.

You can use the System Monospaced, Helvetica, Roman and Courier fonts but
the Courier font and the System Monospaced are the only monospaced fonts
supplied with OS/2 V1.3. A monospaced font with point sizes 8,9,10,11,16
& 20 is supplied with the ALPHA PACKAGE, which may also be used.
The fonts are then requested by specifying Font="Alpha",(10) etc. in the
profile.
The font type or face_name and size may be selected by the Font and
Character_size keywords in the profile. If a profile is not supplied then
the "Alpha",(10) font will be used if it is installed and a character_size
of (8,14) else the "System Monospaced",(10) font will be used and a
character_size of (8,16). Outline fonts are not selectable.

If the point size is not specified then the font is selected by using the
Character_size.
Point sizes (1/72") are :-
Courier (8,10,12), Roman (8,10,12,14,18,24),
Helvetica (8,10,12,14,18,24),
System (8,10,12, {8x8, 8x16,9x20),
"Alpha" (8{8x12},9{9x10},10{8x14},11{11x12},16{12x16},20{12x20}).
If the point size is specified but an image font does not exist for this
nominal point size then the outline font, if available, will be used and
scaled by the Character_size.
The font may be requested by face_name, e.g. Font="Alpha",(8).


Profile
A profile may be specified defining the following keyword values :-

{Colours may take the values :-
BLUE, DARKCYAN, BLACK, DARKBLUE, DARKPINK, DARKGRAY, DARKRED, DARKGREEN,
BROWN, CYAN, RED, GREEN ,PINK, YELLOW, PALEGRAY, DEFAULT, WHITE}

Text_colour specifies the colour of the window text.

Highlight_colour is used for the isolate function of mouse button 1.

Locate_colour is used for the argument for the locate function.

Comment_colour - the first comment_colour is used for comment lines
beginning, /*, {, *, ;, C  and for the 'scale' background.
The second comment_colour is  used for the compressed comment line
and for the Clipboard highlight.

Branch_colour is used for 370, 386 branch instructions.

Expand_colour is used for the text in the label expansion window.

Back_ground is use to specify the main window background colour.

File_type specifies the File types to be recognized. The string must be
▓64 characters and terminated by a comma. The first 6 types are
used for :-
   1 370 assembler
   2 386 assembler
   3 PASCAL, (Ada)
   4 PL/S, PL/AS, PL/I  etc., (REXX)
   5 C
   6 FORTRAN
For REXX files use :- "A37,ASM,PAS,CMD,C,FOR," and replace the PLS entries
under the Language_colour keyword.
For Ada  files use :- "A37,ASM,ADA,PLS,C,FOR," and replace the PAS entries
under the Language_colour keyword.

Comment_start specifies the first two characters of the start of a comment.
The string must be ▓12 characters.  The 6 pairs are used for :-
   1 370 assembler
   2 386 assembler
   3 PASCAL, for Ada specify Comment_start="* ; --/*/*C "
   4 PL/S, PL/AS etc.
   5 C
   6 FORTRAN

Comment_end specifies the last two characters of the end of a comment.
The string must be ▓12 characters.  The 6 pairs are used as for
Comment_start

Precedent_C specifies the C language procedure keywords. The string
must be <=64 characters and terminated by a comma. E.g.
Precedent_C="char,extern,far,int,long,pascal,pointer,short,static,void,"

Language_colour  defines the highlight colours for key words. Up to 128
entries may be defined as follows :-
 file_type,key_word,colour,scan_length
and are terminated by .END, invalid entries are ignored.  The keywords
must be <=12 characters.

Language_operator defines the operator keywords for each language.
The second value indicates how to process the keyword, viz.
< or > indicate the scan direction from the keyword to locate the label,
'P' or 'C' indicates that the keyword specifies an entry point or call,
':' indicates that the label will be followed by a colon,
'2' indicates that the second label following a ',' is to be used.
Up to 32 entries may be defined as follows :-
file_type,<║>C║Pì:┘ì2┘,keyword
and are terminated by '.END', invalid entries are ignored.
The keywords must be <=12 characters. The C-language procedure
values are supplied on the Precedent_C keyword.

Font  may take the values :-
Courier|System|Helvetica|Roman|Alpha<,Bold|Italic><,(Point_size)> or a
face name may be specified e.g. Font="Alpha",(10)

Character_size specifies the (width,height) of the characters.
The character width is used to select the size of the Font if the  point
size is not specified on the "Font" keyword.

Read_file takes the value Yes|No and specifies whether the file  is to be
read in after allocation.

Flow takes the value On|Off and specifies whether to draw flow lines from
branch statements to labels.

Expand takes the value On|Off and specifies that Expand mode will  be
effective once the file is read in.

Marker takes the value On|Off  and specifies whether mouse button 1 will
define marker values.

Language takes the values :-
 *<,Language> {The '*' implies determine the language from the file suffix}.
If a Language is also given then this will be the default if the file type
can not be found in "File_type", e.g.
Language=*,PAS. For PL/I, REXX use Language=PLS etc.
 A37 - 370 assemble
 ASM - 386 macro assemble
 PAS - Pascal (Ada)
 PLS - PL/S or PL/AS etc. (PL/I, REXX)
 C   - C language
 FOR - FORTRAN

Default_chr specifies the default character width and height used for
scaling the Allocate and Command dialogue boxes. The default value is
(10,16), for 8515, 8516 screens a default value of (14,20) is used.

Window  specifies the initial window position.
If no profile is specified then Window=(0,4h,63.5w,26h)
{(0,120,1020,650) for 8515/8516 screens} is assumed where w and h are
the Default_chr width & height.

Quiet will suppress the beep on completion of file read.

Record_structure will record the CALL structure for 370 & 386 assembler,
PASCAL, PL/AS, C and FORTRAN programmes, as the file is read in to memory.

Tab will use X'09' as the tab character to move to column n*8 when file is
read.

Proportional  will use the Font character spacing rather than the Character
width to place the characters.

Keyword will highlight the specified keywords.

Statement_number sets the display of the statement number On|Off.

Command_pgm specifies the programme name invoked by <.

Transfer_pgm specifies the programme name invoked by >.

Alpha has within it (hard coded) routines which understand certain language
features e.g. 370 Assembler labels start in start in column 1, procedures are
invoked by BAL, BAS etc. and PASCAL procedures are preceded by FUNCTION
or PROCEDURE etc.. The keywords and their attributes may be set by the
Language_operator keyword in the profile.
There are 6 such languages 'understood' by Alpha, viz. :-

 1 370 Assembler
 2 386 Assembler
 3 PASCAL (Ada)
 4 PL/AS (PL/I, REXX)
 5 C
 6 FORTRAN

Because Ada is similar to PASCAL and PL/I & REXX are similar to PL/AS,
in respect to procedure calls etc., you can also analyse these languages
by pretending they are type 3 & 4 respectively.

However, you can interpret any language/file type (use the highlighting
facility) by suppling extra definitions in a profile which is specified as a
parameter to Alpha e.g.

  START ALPHA /p profile_name

A sample profile (ALPHA.PRF) is provided in the package, which includes
comments explaining the use of the keywords. This may be edited to change/add
a file extension, highlighting and programme structure by modifying the
following keywords :-

File_type - list of file extensions up to 32 characters
Comment_start - list of comment start character pairs (blank is ignored)
                up to 12 characters.
Comment_end - list of comment end character pairs (blank is ignored)
                up to 12 characters.
Language_colour - list of keyword definitions
  file_type,keyword,colour,maximum scan length
Precedent_C - list of procedure keywords for language 5 which precede
a procedure definition, up to 64 charcaters.
Language_operator - list of operator definitions
  file_type,attributes,keyword


e.g. to add language XYZ with a routine call 'ICALL routine_name' and
a structure similar to PL/S

File_type="A37,ASM,PAS,XYZ,C,"
Language_colour
XYZ,ICALL,DARKGREEN,72
XYZ,Next_key ,RED,72
.END
Language_operator
XYZ,>C,ICALL
.END

Only the first 6 language types will allow the Expand, Flow and Structure
operations to be effective. This implies that you could not use all the
features of Alpha for a new language which did not have the call/label
syntax of one of the existing languages.

The Alpha programme scans the keyword table in the order specified in the
profile to the comment start in the record for a maximum of 16 found
entries. A keyword_found array is created and the text is written by
running down the array from the last to the first so if the entries
in the profile were in the order :-

PLS, END LOOP,GREEN,72
PLS, END,DARKCYAN,72

Then the 'END LOOP' would overwrite the 'END'; spaces are significant.


Alpha2 V1.2
===========

ALPHA2.EXE is a simple 32 bit version of the Alpha programme with
written in C Set/2 and MASM v6.0 which will run on OS/2 V2.0.

Highlighting of keywords has been provided for the following language
types :-
A37,ASM,PAS,PLS,C,FOR


The syntax of Alpha2 is :-

   START ALPHA2 ìfile_name┘ ì/p ìprofile name - default ALPHA.PRF┘┘

The Language_colour, File_type, Comment_start, Comment_end, Language_operator,
Precedent_C, Transfer_pgm and Window keywords are the only ones which are
recognized from the profile.
The window position is remembered if it is resized.

The Allocate dialogue box is used to request a file to be read. If the
drive letter is changed then the OK button should be used to refresh the
List boxes. {The maximum number of child windows is 16.}
The 'Profile' button will remember the File entered in the Entry box as
the profile for subsequent invocations. A null value will remove the saved
profile name. This will obviate the need for the '/p' parameter and enable
a file to be dropped on the unstarted programme. Files may also be dropped
on the main window. The 'Transfer' button will pass the contents of the
Combo box to the Transfer_pgm. (The data will be passed unmodified.)

The Command dialogue box may be used to issue a search command e.g.

None case sensitive search for a string.
Case sensitive search for a string.
Case sensitive search for a string in column one.
Move to a specified line number.

The COMBO box will hold the previous three commands entered.

The Options menue may be used to set the following options :-

 Statement No. - display the statement number in the TITLE bar.
 Tab - expand the record by using X'09' characters to round
       to columns n*8.
 Keyword - highlight the keywords.
 Include - For the files MASM, PAS, PLS, C read the include
           files specified by :-
           include file_name, {£INCLUDE : 'file_name' },
           %INCLUDE first_part_of_file_name;,
           #include <file_name>,
           respectively when expanding a call etc.
           (The current directory together with the paths defined
           by the INCLUDE environmental variable will be searched.
           The total number of open files/windows is limited to 16 so
           the include nesting level can not exceed 16 - the number
           of open windows. For language 4, PL/S, the file extension
           is appended to the first_part_of_file_name.)
Grid - Draw vertical grid lines through every tenth character in 'Grid' colour.


The Font  dialogue box may be used to change and remember the font of
the text, comments etc.

The Colour dialogue box may be used to change and remember the colours
of the text, comments etc. The following colours may be changed with
this dialog box :-
Text - The main text colour.
Highlight - The mouse button 1 isolate keyword.
Locate/Position - The mouse button 2 locate string, the character
  position of the last mouse button 1 click and the Structure List box
  procedures.
Comment/statement# - The Comment colour, statement number and Structure
  List box calls.
Background - The background colour.
Branch - The Branch/Jump instruction colour.
Grid - The vertical grid line colour.
Select area - The mouse button 1 drag area.
{The colours available are:-
BLUE, DARKCYAN, BLACK, DARKBLUE, DARKPINK, DARKGRAY, DARKRED, DARKGREEN,
BROWN, CYAN, RED, GREEN ,PINK, YELLOW, PALEGRAY, DEFAULT, WHITE,
ORANGE, PURPLE, PALEGREEN, PALEBLUE.
The last four will not be available on VGA screens.}

The Window menu may be used to close all child windows or to arrange them
so that the title text is visible, Cascade, or so that a partial view of
each child may be seen, Tile. The Select window option may be used to show a
selected window.

The mouse button 1 will highlight a string and mouse button 2 will cause a
search for this string from the current line +1. If mouse button 1 is
clicked twice on a label then a search from the top of the file is made
for the label definition or procedure entry and a secondary window is
opened (Expand).
{The language structure tables are searched first so if you
have specified some structure keywords via. Language_operator
then you will have to record the structure first, Ctrl+s.}

If mouse button 1 is clicked twice on a BEGIN for PASCAL, DO for PLS or {
for C then the code up to the following END etc. will not be displayed.
These lines may be restored by double clicking on the suppressed line
or by F12. If the Include option is effective and button 1 is double clicked
on an 'INCLUDE' statement then a second window will be created with the
include file. If mouse button 1 is held down and dragged to the bottom or top
of the window the window will continue to scroll until the button is
released or the mouse is moved back within the window.

The following keys are effective for the programme :-

F1 will open the Help window.
F2 will open the Font dialogue box.
F3 will terminate the programme.
F4 will open the Allocate file dialogue box.
F5 will repeat the previous command.
F6 will open the Command dialogue box.
F7 will scroll the window up 1/2 a screen.
F8 will scroll the window down 1/2 a screen.
F12 will reset the collapse of the BEGIN/END pairs etc.
F24 (F2+Shift) will open the Colour dialogue box.
Page_Up will scroll up 1 screen.
Page_Down will scroll down 1 screen.
Home will scroll to the top of the file.
End will scroll to the end of the file.
Up_arrow - scroll up 1 line.
Down_arrow - scroll down 1 line.
Left_arrow - scroll Left 1 column.
Right_arrow - scroll Right 1 column.

The Insert+Ctrl keys will copy the highlighted lines to the Clipboard.

The Delete+Ctrl keys will suppress the lines highlighted by the button 1
drag area from the display.

The Delete+Shift keys will restore the lines previously hidden.

The Ctrl+S keys will record/display the programme structure.
{The programme calling structure will be recorded if this has not already
 been done and then the Structure dialog box will be displayed.
 If an entry from the List box is selected then the last active window
 will be scrolled to that line. The Print button may be used to print
 the contents of the List box on LPT1. The calling structure is based on
 the profile keywords :- Language_operator, Precedent_C and File_type.}

The Alt+n keys will record a bookmark.

The Ctrl+n keys will move to a bookmark.

The Help menu may be used to select the About box, the help window or
the extended OS/2 help file, ALPHA2.HLP, which must be installed in
the HELP path.

The following keys are effective for the Help window :-
1) Home - Move to top of file.
2) End - Move to end of file.
3) Page_up - scroll up 1 screen.
4) Page_down - scroll down 1 screen.
5) Up_arrow - scroll up 1 line.
6) Down_arrow - scroll down 1 line.
9) The Vertical scroll bar.

A file may be allocated by dragging mouse button 2 with the Ctrl key
pressed over the Alpha window and releasing the button.


Changes since V1.7

Alpha  - 16 and 20 point fonts.
       - PAS,C,PLS - Comment continuation.
       - Default window size for 8515/8516 screens.
       - Language_operator keyword to specify programme structure.
       - Comment_end keyword to specify the terminating characters of
         a comment.
       - Support for OS/2 Help file ALPHA.HLP.

Alpha2 - Collapse of BEGIN/END pairs.
       - PAS,C,PLS - Comment continuation.
       - Printer support.
       - Open a second window with the inlude file by double clicking on
         the INCLUDE statement, provided that the Include option is
         effective.
       - Comment_end keyword to specify the terminating characters of
         a comment.
       - Select window function in Window menue.
       - Remember the profile name from the Allocate menue.
       - Transfer_pgm keyword from profile.
       - Support for OS/2 Help file ALPHA2.HLP.
       - Insert+Ctrl - will place highlighted lines in the Clipboard.
       - Ctrl+S - will record/display the programme structure.
       - Alt+n - will set a bookmark.
       - Ctrl+n - will move to a bookmark.
       - Option - Grid - draw vertical grid lines every 10th. character.