# [OS X TeX] Stack size limit error with hyperref

Fri Mar 25 23:34:48 EST 2005

Ross,

Thanks, this works exactly as you described!

Richard

On Mar 25, 2005, at 1:01 AM, Ross Moore wrote:

> Hi Richard,
>
> On 25/03/2005, at 3:23 PM, Richard Seguin wrote:
>
>> Ross,
>>
>> Thanks, you got me on the right track! It turns out that hyperref
>> does not like to see a \bm command inside of a section name. It also
>> crashes with a \boldsymbol, but not with a \mathbf, although the
>> \mathbf doesn't seem to do anything within a section name.
>
> You are...
>
>> I'm using the article class, and section names are typeset in bold.
>> When there is a $...$ string embedded in the section name, it is not
>> set in bold and it doesn't look good. The \bm command used within the
>> $...$ string, for example $\bm{\beta T}$, corrects this.
>> \tableofcontents does not seem to have a problem with this, but
>> hyperref crashes.
>
>    ... making bookmarks, yes ?
>
>>
>> So how do I get the $...$ string to be typeset in bold within the
>> section name, consistent with the rest of the name, and not crash
>> hyperref?
>
> While I agree with the sentiments expressed by Will concerning
> formatting commands within section-titles, there is in fact
> a way to avoid the difficulties that you are encountering,
> without editing .sty files.
>
>
> First of all, let's try to understand what is going on.
>
> To make a bookmark from your section's title,  hyperref  needs
> to construct a string that will be displayed in the 'Bookmarks'
> window of the PDF browser. This requires expanding all macros
> that occur in the section-title.
>
> However, it is just trying to get the correct text to display,
> and does not care about styles or spacing. Those aspects are
> all pre-determined, and only standard characters are allowed.
> Thus the \bm is quite irrelevant, yet still needs to be
> expanded, as it might (but doesn't) contain characters.
> The infinite loop occurs because some things in the expansion
> of \bm occur within a quite different context from what it was
> designed to handle.
>
>
> So the best thing to do is to give \bm a temporary expansion
> of nothing (i.e., the empty string), at the critical time when
> the expansion occurs for constructing the bookmark's anchor-text.
>
>
> There is a standard mechanism in  hyperref.sty  to do just this:
>
>      \pdfstringdefDisableCommands{\def\bm{}\def\beta{ beta }}
>
> Note that pdfTeX doesn't yet know how to put a real \beta
> into the bookmark, so rather than get nothing, we put 'beta'
> spelt out instead, and with some space around it.
>
>
>
> As I've not had a chance to test your actual source coding,
> this is just my best guess at what I think is going wrong
> for you, and how to fix it --- based upon past experience
> of similar problems, of course.
> So if the above doesn't help, please send an explicit
> example, cut down as much as possible.
>
>
>
>>
>>  Richard Séguin
>>
>> On Mar 24, 2005, at 1:13 AM, Ross Moore wrote:
>>
>>> Hi Richard,
>>>
>>>
>>> On 24/03/2005, at 3:33 PM, Richard Seguin wrote:
>>>
>>>> I'm trying to typeset a 75 page document using the hyperref
>>>> package, and I'm getting this error message:
>>>>
>>>> ! TeX capacity exceeded, sorry [input stack size=5000].
>>>
>>> This usually indicates that an infinite loop has developed.
>>> I've seen this before with hyperref, particularly with
>>> special characters (such as '~') used incorrectly within a URL.
>>>
>>>
>>> I'd guess that you have defined a macro that expands to
>>> something containing a '~' (or perhaps '#' or '&'),
>>> then tried to use this as the URL part of an \href
>>> or similar command.
>>>
>>> That cannot work. There are ways around this.
>
>
> Hope this helps,
>
> 	Ross
>
>
>
> -----------------------------------------------------------------------
> -
> Ross Moore                                         ross at maths.mq.edu.au
> Mathematics Department                             office: E7A-419
> Macquarie University                               tel: +61 +2 9850
> 8955
> Sydney, Australia                                  fax: +61 +2 9850
> 8114
> -----------------------------------------------------------------------
> -
>
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