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% Copyright (C) 2019-2025 Free Software Foundation, Inc.
%
% This program 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 3 of the License, or
% (at your option) any later version.
%
% This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
classdef Stack < handle
% Class STACK - Manage Emacs' stack state.
properties
% Stack last sent to Emacs
EmacsStack = [];
EmacsFrame = 1;
% Netshell object if we should direct that way instead.
NetShellObject = [];
% Flag - do we need to tell Emacs what changed?
StackPending = false;
FramePending = false;
end
methods
function es = Stack(nso)
if nargin == 1
es.NetShellObject = nso;
end
es.resetEmacs();
end
function captureStack(es, newstack, newframe)
if ~isempty(newstack) && ...
( strcmp(newstack(1).name, 'ebstack') ||...
strcmp(newstack(1).name, 'dbhotlink') )
newstack = newstack(2:end);
end
idx = 1;
cutbelow = 0;
while idx < length(newstack)
if contains(newstack(idx).name, 'timercb')
% As soon as we see Emacs Server, then we went too far.
cutbelow = idx;
end
idx = idx+1;
end
if cutbelow
newstack = newstack(cutbelow+1:end);
end
if ~stackEqual(es.EmacsStack, newstack)
es.EmacsStack = newstack;
es.StackPending = true;
end
if newframe ~= es.EmacsFrame
es.EmacsFrame = newframe;
es.FramePending = true;
end
end
function updateEmacs(es, newstack, newframe)
% Update Emacs' view of the stack
es.captureStack(newstack, newframe);
str = [ '(progn ;;Stack' newline ];
if es.StackPending
str = [ str ...
stackFrames(es.EmacsStack) ...
newline ];
end
str = [ str ...
' (mlg-set-stack-frame ' num2str(es.EmacsFrame) ')' ];
str = [ str ')'];
es.StackPending = false;
es.FramePending = false;
if isempty(es.NetShellObject)
disp('<EMACSCAP>(eval)');
disp(str);
disp('</EMACSCAP>')
else
es.NetShellObject.SendEval(str);
end
end
function resetEmacs(es)
end
function updateForHotLinks(es, newstack, newframe)
es.captureStack(newstack, newframe);
% updateEmacs(es, newstack, newframe);
if es.StackPending || es.FramePending
str = [ '(progn ;;Stack' newline ];
if es.StackPending
str = [ str ...
stackFrames(es.EmacsStack) ...
newline ];
end
str = [ str ...
' (mlg-set-stack-frame-via-gud ' num2str(es.EmacsFrame) ')' ];
str = [ str ')'];
else
str = '';
end
es.StackPending = false;
es.FramePending = false;
if ~isempty(str)
if isempty(es.NetShellObject)
disp(str);
else
es.NetShellObject.SendEval(str);
end
end
end
end
end
function str=stackFrames(ST)
% Return Emacs Lisp form representing the current stack.
str = ' (mlg-set-stack (quote (';
for i=1:length(ST)
str = [str newline ' ("' fixFile(ST(i).file) '" "' ...
ST(i).name '" ' num2str(ST(i).line) ')' ]; %#ok
end
str = [ str ')))' ];
end
function nf = fixFile(filename)
% FIXFILE - Cleanup file for Emacs
%
% Prefix FILENAME with the TRAMP remote location if matlab-shell is running remotely. This is needed
% to enable debugging, e.g. ebstack, etc.
%
% Replace Windows path separators with POSIX separators such that they do not look like escape
% characters, that way we can send to Emacs.
nf = [getenv('EMACS_MATLAB_SHELL_REMOTE'), regexprep(filename, "\", "/")];
end
function thesame = stackEqual(stack1, stack2)
thesame = true;
if length(stack1) ~= length(stack2)
thesame=false;
return;
end
for i=1:length(stack1)
if ~strcmp(stack1(i).name, stack2(i).name) || ...
stack1(i).line ~= stack2(i).line
thesame = false;
return
end
end
end
% LocalWords: Netshell ebstack dbhotlink progn mlg EMACSCAP newstack newframe gud FIXFILE
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