f

#### starting a LaTeX argument with "XX" or "AA" causes macro problems but "XY" is OK

I'm trying to modify the book.cls file to include a Foreword and
have defined a command \forewordbody{}.

If I call this as
\forewordbody{The quick brown fox}
it works fine, but if I call it as
\forewordbody{XXYY The quick brown fox}
the result seems to be "empty" when tested, and the string
YY The quick brown fox
(note: the XX is missing) appears in the output at the
place (marked "HERE" below) where the test was performed.
Any repeated letter shows the problem ("xx", "aa").  I often
use "XXX" to mark items in the text that I have to fix up later,
which is when I saw this problem.

Any ideas what's happening?

----

In the class file I have:

\long\def\forewordbody#1{\gdef\@forewordbody{#1}}
\gdef\@forewordbody{}

....

\if\@forewordbody\empty\else         <---
\Large FOREWORD
\@forewordbody
...
\fi

 0
ggrps (1)
10/20/2005 2:27:19 PM
comp.text.tex 39029 articles. 3 followers.

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<ggrps@uit.co.uk> wrote:

> I'm trying to modify the book.cls file to include a Foreword and
> have defined a command \forewordbody{}.
>
> If I call this as
>   \forewordbody{The quick brown fox}
> it works fine, but if I call it as
>   \forewordbody{XXYY The quick brown fox}
> the result seems to be "empty" when tested, and the string
>   YY The quick brown fox
> (note: the XX is missing) appears in the output at the
> place (marked "HERE" below) where the test was performed.
> Any repeated letter shows the problem ("xx", "aa").  I often
> use "XXX" to mark items in the text that I have to fix up later,
> which is when I saw this problem.
>
>   Any ideas what's happening?
>
> ----
>
> In the class file I have:
>
> \long\def\forewordbody#1{\gdef\@forewordbody{#1}}
> \gdef\@forewordbody{}
>
> ...
>
> \if\@forewordbody\empty\else         <---
>  \Large FOREWORD
>  \@forewordbody
>  ...
> \fi

Use \ifx, since \if compares the two tokens following it /after/
expansion of the token following it. So, when \@forewordbody has
"XXsomething" as replacement text, you have

\if XXsomething\empty\else some other thing\fi

which evaluates to true and so the final expansion is "something".

It happens also that

\if{}{}something\else some other thing\fi

expands to "some other thing".

Ciao
Enrico
 0
gregorio (1367)
10/20/2005 3:11:35 PM
<ggrps@uit.co.uk> wrote in message
> I'm trying to modify the book.cls file to include a Foreword and
> have defined a command \forewordbody{}.
>
> If I call this as
>   \forewordbody{The quick brown fox}
> it works fine, but if I call it as
>   \forewordbody{XXYY The quick brown fox}
> the result seems to be "empty" when tested, and the string
>   YY The quick brown fox
> (note: the XX is missing) appears in the output at the
> place (marked "HERE" below) where the test was performed.
> Any repeated letter shows the problem ("xx", "aa").  I often
> use "XXX" to mark items in the text that I have to fix up later,
> which is when I saw this problem.
>
>   Any ideas what's happening?
>
> ----
>
> In the class file I have:
>
> \long\def\forewordbody#1{\gdef\@forewordbody{#1}}
> \gdef\@forewordbody{}
>
> ...
>
> \if\@forewordbody\empty\else         <---
> \Large FOREWORD
> \@forewordbody
> ...
> \fi

\if expands tokens until it gets two unexpandable tokens.
And then it tests to see if the character codes agree.

Hence XX and AA give true, but XY gives false.

--
Jonathan

 0
J.Fine (440)
10/20/2005 3:45:58 PM

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