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<p class="MsoNormal"><span style="color:windowtext">Hello Samuel,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">Just a question what is the goal of this feature ?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">Because after more than 10 years on Scilab, I never need this, so I need your help to understand needs and cases.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">Currently, un/protect is only on local variables not on global. ( but that could change if needed )<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#0070C0"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#0070C0">Look Answers/Questions in blue in your message<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="FR" style="color:windowtext">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR" style="color:windowtext">Antoine<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="FR" style="color:windowtext">De :</span></b><span lang="FR" style="color:windowtext"> Samuel Gougeon <sgougeon@free.fr>
<br>
<b>Envoyé :</b> dimanche 7 avril 2019 19:25<br>
<b>À :</b> Antoine Elias <Antoine.Elias@esi-group.com>; List dedicated to development questions <dev@lists.scilab.org><br>
<b>Objet :</b> protect / unprotect: recent progress & analysis<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="FR"><o:p> </o:p></span></p>
<p>Hello Antoine,<o:p></o:p></p>
<p>On 2019-01-18, you called in a private mail for comments about the <br>
initial implementation of some variables protect / unprotect features<br>
commited @ <a href="https://codereview.scilab.org/20712">https://codereview.scilab.org/20712</a><o:p></o:p></p>
<p>First of all, thanks a lot for the implementation progress about this long-wished feature.<br>
Excellent news.<br>
<br>
After your call, please find below some (sometime naive) remarks and questions about the initial commit, mainly about the expected behavior of the features.<br>
<br>
As a contribution to the features analysis,<br>
<br>
Best regards<br>
Samuel<o:p></o:p></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt;mso-list:l4 level1 lfo3">
Do protect() and unprotect() return anything?<o:p></o:p></li></ul>
<p class="MsoNormal"><span style="color:#0070C0">Antoine: Currently nothing, do you have any request ?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#0070C0">I can return status of un/protect and %f for non-existing variable.<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt;mso-list:l4 level1 lfo3">
Do we have<br>
assert_checkequal(size(isprotected(["a", "b", "c"])), [1 3])<o:p></o:p></li></ul>
<p class="MsoNormal"><span style="color:#0070C0">Antoine: Yep<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt;mso-list:l4 level1 lfo3">
Will current "permanent variables" be protected with protect() or with another special protection?<br>
unprotect %inf // => error ?<br>
// IMO, one should avoid keeping concurrent protection features.<o:p></o:p></li></ul>
<p class="MsoNormal"><span style="color:#0070C0">Antoine: Current protection of predefined variable ( %pi, %inf, %nan, %e,
</span><span style="font-family:"Times New Roman",serif;color:#0070C0">…</span><span style="color:#0070C0"> ) is done by the same feature.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#0070C0">I don't know if we should forbidden unprotect of predefined variables.<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt;mso-list:l4 level1 lfo3">
Protection of global variables: What will happen or is expected in the following cases, from the top level (console)?<br>
global a<br>
protect a<br>
clear a<br>
clearglobal a<br>
// See also: <a href="http://bugzilla.scilab.org/15250">http://bugzilla.scilab.org/15250</a><br>
// <a href="http://bugzilla.scilab.org/14928">http://bugzilla.scilab.org/14928</a><o:p></o:p></li></ul>
<p class="MsoNormal"><span style="color:#0070C0">Antoine: Clearly, I don't know </span>
<span style="font-family:"Segoe UI Emoji",sans-serif;color:#0070C0">😉</span><span style="color:#0070C0"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#0070C0">Who is the strongest between local protection or clearglobal ?<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt;mso-list:l4 level1 lfo3">
Protection and scope:<br>
When protecting a variable in a function, what will happen when leaving the function?<br>
a = 1;<br>
b = 2;<br>
function r = test(g)<br>
disp(isprotected("g")) <br>
// Is the protection status of a variable as input argument heritated by the passed copy?<br>
// I guess that no, but this should be clearly stated and tested.<br>
a = a, protect a<br>
global b, protect b<br>
c = %pi/%e;<br>
r = c;<br>
protect c r<br>
endfunction<br>
e = 3; protect e<br>
d = test(e); // Do we get an error due to deletion of protected internal c ?<br>
isprotected("a") // => %F : protect a // just protects the local copie, doesn't it?<br>
isprotected("b") // => %T | %F ?<br>
isprotected("d") // => %T | %F ?<o:p></o:p></li></ul>
<p class="MsoNormal"><span style="color:#0070C0">Antoine: When leaving a function, ALL local variables are deleted regardless their protection.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#0070C0">Why ? Because we don't know where to put them
</span><span style="font-family:"Segoe UI Emoji",sans-serif;color:#0070C0">😉</span><span style="color:#0070C0"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#0070C0"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#0070C0"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#0070C0">Antoine: funcprot defines a global behavior for redefinition of functions, that's not exactly the same scope.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#0070C0">Maybe we can include functions in un/protect feature but what to do with funcprot ?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#0070C0">I think it will be difficult to keep both and that will be puzzling for users.<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt;mso-list:l4 level1 lfo3">
Will funcprot() be kept? If yes, how will it cope with the new protect/unprotect feature?<br>
funcprot(2);<br>
unprotect linspace // => error ?<br>
linspace = 1; // => error ?<br>
// Conversely:<br>
funcprot(0)<br>
function test(), a=1; endfunction<br>
protect test<br>
test = 3; // => error ?<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt;mso-list:l4 level1 lfo3">
class protection: in order to replace funcprot(), we could imagine a "class protection" more general than only for Scilab functions: each time that a new object of type 13 (or #n) or of typeof "function" (or whatever) is created, a given protection status is
automatically ascribed to it.<br>
protect("-type", 13) // <=> funcprot(2)<br>
unprotect("-type", 13) // <=> funcprot(0)<br>
protect("-type", 14) // <=> as a libprot<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt;mso-list:l4 level1 lfo3">
Protection level: As with the current funcprot() implementation, we may imagine transfering to the new protect() function the 3-status possibility: unprotected / warnable / protected.<br>
Then, unprotect() becomes useless. It is replaced with<br>
protect(0, ["a" "b" "cd"])<br>
// in addition to<br>
protect(1, ["a" "b" "cd"])<br>
protect(2, ["a" "b" "cd"])<br>
<br>
To stay console-oriented, the 0|1|2 status could also be figures "0"|"1"|"2", provided that no Scilab variable name can start with a 0-9 figure.<br>
To me, even without "warnable" status, these syntaxes would be preferable, avoiding a useless unprotect() interface while the job is basically the same. Just the value to ascribe to the new status is changed. This requires an additional input arg, not a specific
function. Scilab is not a low-level language.<br>
<br>
<br>
<o:p></o:p></li></ul>
<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
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