Use of noexpand in the implementation of TextOrMath for eTeXWhen to use edef, noexpand, and expandafter?Does noexpand have to be a primitive?Problem with nested noexpand and edefReplacement for unexpanded without eTeX extensionWhy do some arguments in a macro need to be preceded by noexpand?How to use noexpand in an edef?Why six noexpand in a row?How can I use noexpand and unexpanded without appending a space to the unexpanded tokens?How should I /protect this command for use in csname?ifx doesn't treat noexpand as relax
Send out email when Apex Queueable fails and test it
Finitely generated matrix groups whose eigenvalues are all algebraic
How to stretch the corners of this image so that it looks like a perfect rectangle?
Why were 5.25" floppy drives cheaper than 8"?
Notepad++ delete until colon for every line with replace all
What is an equivalently powerful replacement spell for Yuan-Ti's Suggestion spell?
How to install cross-compiler on Ubuntu 18.04?
How to show a landlord what we have in savings?
Did 'Cinema Songs' exist during Hiranyakshipu's time?
How does a dynamic QR code work?
What do you call someone who asks many questions?
How to coordinate airplane tickets?
Were days ever written as ordinal numbers when writing day-month-year?
Is this draw by repetition?
What historical events would have to change in order to make 19th century "steampunk" technology possible?
In Bayesian inference, why are some terms dropped from the posterior predictive?
OP Amp not amplifying audio signal
What are the G forces leaving Earth orbit?
What is required to make GPS signals available indoors?
Why is it a bad idea to hire a hitman to eliminate most corrupt politicians?
Mathematica command that allows it to read my intentions
Which ISO should I use for the cleanest image?
Machine learning testing data
How do conventional missiles fly?
Use of noexpand in the implementation of TextOrMath for eTeX
When to use edef, noexpand, and expandafter?Does noexpand have to be a primitive?Problem with nested noexpand and edefReplacement for unexpanded without eTeX extensionWhy do some arguments in a macro need to be preceded by noexpand?How to use noexpand in an edef?Why six noexpand in a row?How can I use noexpand and unexpanded without appending a space to the unexpanded tokens?How should I /protect this command for use in csname?ifx doesn't treat noexpand as relax
In latexrelease 2015/01/01, there are two implementations of TextOrMath: one for regular
TeX, the other one for eTeX-like engines (more precisely: those which support protected). My question concerns the latter:
protectedexpandafterdefcsname TextOrMathspaceendcsname%
(...) % no problem here
edefTextOrMath#1#2% from latex.ltx
expandafternoexpandcsname TextOrMathspaceendcsname
#1#2
I think I understand well these definitions, however I can't figure out why the edef isn't simply written this way:
edefTextOrMath#1#2% from me
csname TextOrMathspaceendcsname
#1#2
Since the internal TextOrMath<space> macro is protected, what is the point of preceding it with noexpand inside the edef? Is it because the author feared that protected might be deficient?..
I made a test like this (ran with pdfTeX):
% From latex.ltx (or p. 153 of source2e.pdf)
protectedexpandafterdefcsname TextOrMathspaceendcsname%
ifmmode expandafter@secondoftwo
else expandafter@firstoftwo fi
edefTextOrMath#1#2%
expandafternoexpandcsname TextOrMathspaceendcsname
#1#2
% My simpler way of doing the same (?)
edefaltTextOrMath#1#2%
csname TextOrMathspaceendcsname
#1#2
showTextOrMath % TextOrMath=macro:#1#2->TextOrMath #1#2.
showaltTextOrMath % altTextOrMath=ditto
ifxTextOrMathaltTextOrMath
identical
else
different
fi
vfill
eject
bye
This test prints 'identical' and seems to indicate that my definition is equivalent to the one in latex.ltx (but slightly simpler). Did I miss something?
Thanks!
macros expansion definition protected-macro
asked 4 hours ago
frougonfrougon
641611
add a comment |
In latexrelease 2015/01/01, there are two implementations of TextOrMath: one for regular
TeX, the other one for eTeX-like engines (more precisely: those which support protected). My question concerns the latter:
protectedexpandafterdefcsname TextOrMathspaceendcsname%
(...) % no problem here
edefTextOrMath#1#2% from latex.ltx
expandafternoexpandcsname TextOrMathspaceendcsname
#1#2
I think I understand well these definitions, however I can't figure out why the edef isn't simply written this way:
edefTextOrMath#1#2% from me
csname TextOrMathspaceendcsname
#1#2
Since the internal TextOrMath<space> macro is protected, what is the point of preceding it with noexpand inside the edef? Is it because the author feared that protected might be deficient?..
I made a test like this (ran with pdfTeX):
% From latex.ltx (or p. 153 of source2e.pdf)
protectedexpandafterdefcsname TextOrMathspaceendcsname%
ifmmode expandafter@secondoftwo
else expandafter@firstoftwo fi
edefTextOrMath#1#2%
expandafternoexpandcsname TextOrMathspaceendcsname
#1#2
% My simpler way of doing the same (?)
edefaltTextOrMath#1#2%
csname TextOrMathspaceendcsname
#1#2
showTextOrMath % TextOrMath=macro:#1#2->TextOrMath #1#2.
showaltTextOrMath % altTextOrMath=ditto
ifxTextOrMathaltTextOrMath
identical
else
different
fi
vfill
eject
bye
This test prints 'identical' and seems to indicate that my definition is equivalent to the one in latex.ltx (but slightly simpler). Did I miss something?
Thanks!
macros expansion definition protected-macro
asked 4 hours ago
frougonfrougon
641611
thanks I suppose we could change that:-)
– David Carlisle
2 hours ago
Many thanks for your insight into this, I was really puzzled!
– frougon
2 hours ago
add a comment |
In latexrelease 2015/01/01, there are two implementations of TextOrMath: one for regular
TeX, the other one for eTeX-like engines (more precisely: those which support protected). My question concerns the latter:
protectedexpandafterdefcsname TextOrMathspaceendcsname%
(...) % no problem here
edefTextOrMath#1#2% from latex.ltx
expandafternoexpandcsname TextOrMathspaceendcsname
#1#2
I think I understand well these definitions, however I can't figure out why the edef isn't simply written this way:
edefTextOrMath#1#2% from me
csname TextOrMathspaceendcsname
#1#2
Since the internal TextOrMath<space> macro is protected, what is the point of preceding it with noexpand inside the edef? Is it because the author feared that protected might be deficient?..
I made a test like this (ran with pdfTeX):
% From latex.ltx (or p. 153 of source2e.pdf)
protectedexpandafterdefcsname TextOrMathspaceendcsname%
ifmmode expandafter@secondoftwo
else expandafter@firstoftwo fi
edefTextOrMath#1#2%
expandafternoexpandcsname TextOrMathspaceendcsname
#1#2
% My simpler way of doing the same (?)
edefaltTextOrMath#1#2%
csname TextOrMathspaceendcsname
#1#2
showTextOrMath % TextOrMath=macro:#1#2->TextOrMath #1#2.
showaltTextOrMath % altTextOrMath=ditto
ifxTextOrMathaltTextOrMath
identical
else
different
fi
vfill
eject
bye
This test prints 'identical' and seems to indicate that my definition is equivalent to the one in latex.ltx (but slightly simpler). Did I miss something?
Thanks!
macros expansion definition protected-macro
asked 4 hours ago
frougonfrougon
641611
In latexrelease 2015/01/01, there are two implementations of TextOrMath: one for regular
TeX, the other one for eTeX-like engines (more precisely: those which support protected). My question concerns the latter:
protectedexpandafterdefcsname TextOrMathspaceendcsname%
(...) % no problem here
edefTextOrMath#1#2% from latex.ltx
expandafternoexpandcsname TextOrMathspaceendcsname
#1#2
I think I understand well these definitions, however I can't figure out why the edef isn't simply written this way:
edefTextOrMath#1#2% from me
csname TextOrMathspaceendcsname
#1#2
Since the internal TextOrMath<space> macro is protected, what is the point of preceding it with noexpand inside the edef? Is it because the author feared that protected might be deficient?..
I made a test like this (ran with pdfTeX):
% From latex.ltx (or p. 153 of source2e.pdf)
protectedexpandafterdefcsname TextOrMathspaceendcsname%
ifmmode expandafter@secondoftwo
else expandafter@firstoftwo fi
edefTextOrMath#1#2%
expandafternoexpandcsname TextOrMathspaceendcsname
#1#2
% My simpler way of doing the same (?)
edefaltTextOrMath#1#2%
csname TextOrMathspaceendcsname
#1#2
showTextOrMath % TextOrMath=macro:#1#2->TextOrMath #1#2.
showaltTextOrMath % altTextOrMath=ditto
ifxTextOrMathaltTextOrMath
identical
else
different
fi
vfill
eject
bye
This test prints 'identical' and seems to indicate that my definition is equivalent to the one in latex.ltx (but slightly simpler). Did I miss something?
Thanks!
macros expansion definition protected-macro
macros expansion definition protected-macro
asked 4 hours ago
frougonfrougon
641611
asked 4 hours ago
frougonfrougon
641611
asked 4 hours ago
frougonfrougon
641611
asked 4 hours ago
frougonfrougon
641611
asked 4 hours ago
frougonfrougon
641611
641611
thanks I suppose we could change that:-)
– David Carlisle
2 hours ago
Many thanks for your insight into this, I was really puzzled!
– frougon
2 hours ago
add a comment |
thanks I suppose we could change that:-)
– David Carlisle
2 hours ago
Many thanks for your insight into this, I was really puzzled!
– frougon
2 hours ago
thanks I suppose we could change that:-)
– David Carlisle
2 hours ago
thanks I suppose we could change that:-)
– David Carlisle
2 hours ago
Many thanks for your insight into this, I was really puzzled!
– frougon
2 hours ago
Many thanks for your insight into this, I was really puzzled!
– frougon
2 hours ago
add a comment |
1 Answer
1
active
oldest
votes
No you didn't miss anything, just old habits die hard as we gradually add these modern post 1992 features into the sources....
answered 2 hours ago
David CarlisleDavid Carlisle
497k4111441891
add a comment |
Your Answer
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "85"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2ftex.stackexchange.com%2fquestions%2f482829%2fuse-of-noexpand-in-the-implementation-of-textormath-for-etex%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
No you didn't miss anything, just old habits die hard as we gradually add these modern post 1992 features into the sources....
answered 2 hours ago
David CarlisleDavid Carlisle
497k4111441891
add a comment |
No you didn't miss anything, just old habits die hard as we gradually add these modern post 1992 features into the sources....
answered 2 hours ago
David CarlisleDavid Carlisle
497k4111441891
add a comment |
No you didn't miss anything, just old habits die hard as we gradually add these modern post 1992 features into the sources....
answered 2 hours ago
David CarlisleDavid Carlisle
497k4111441891
No you didn't miss anything, just old habits die hard as we gradually add these modern post 1992 features into the sources....
answered 2 hours ago
David CarlisleDavid Carlisle
497k4111441891
answered 2 hours ago
David CarlisleDavid Carlisle
497k4111441891
answered 2 hours ago
David CarlisleDavid Carlisle
497k4111441891
answered 2 hours ago
David CarlisleDavid Carlisle
497k4111441891
497k4111441891
add a comment |
add a comment |
Thanks for contributing an answer to TeX - LaTeX Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2ftex.stackexchange.com%2fquestions%2f482829%2fuse-of-noexpand-in-the-implementation-of-textormath-for-etex%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
thanks I suppose we could change that:-)
– David Carlisle
2 hours ago
Many thanks for your insight into this, I was really puzzled!
– frougon
2 hours ago