Item1757: MathModePlugin produces multi-line img tags

MathModePlugin can produce img tags that span lines, and these are not always rendered as images. Instead, the < and > are converted to &lt; and &gt; and so the browser shows the img tag code.

For example, this example taken from MathModePlugin:

<latex title="Calligraphics" color="orange">
  \cal
  A, B, C, D, E, F, G, H, I, J, K, L, M, \\
  \cal
  N, O, P, Q, R, S, T, U, V, W, X, Y, Z
</latex>

... produces this HTML:

<img alt="\cal
  A, B, C, D, E, F, G, H, I, J, K, L, M, \  \cal
  N, O, P, Q, R, S, T, U, V, W, X, Y, Z" class="mmpImage" src="/fw/pub/System/MathModePlugin/_MathModePlugin_2a610dcb31a93be293067cf1a48e8c4e.png" title="Calligraphics" color="orange" size="Large" />

Foswiki does not, in general, handle img tags that span multiple lines. MathModePlugin strips leading whitespace and trailing whitespace, and it appears that foswiki removes backslash-newline sequences from the alt attribute, and I think that is why this example (also from MathModePlugin) works:

<latex>
  {\cal P} & = & \{f_1, f_2, \ldots, f_m\} \\
  {\cal C} & = & \{c_1, c_2, \ldots, c_m\} \\
  {\cal N} & = & \{n_1, n_2, \ldots, n_m\}
</latex>

... producing this HTML:

<img alt="{\cal P} &#38; &#61; &#38; \{f&#95;1, f&#95;2, \ldots, f&#95;m\} \  {\cal C} &#38; &#61; &#38; \{c&#95;1, c&#95;2, \ldots, c&#95;m\} \  {\cal N} &#38; &#61; &#38; \{n&#95;1, n&#95;2, \ldots, n&#95;m\}" class="mmpImage" src="/fw/pub/System/MathModePlugin/_MathModePlugin_350ce2adb8eb45bb05ff77b5f45cf15d.png"  />

I can fix the problem by changing this in entityEncode() in lib/Foswiki/Plugins/MathModePlugin/Core.pm

    s/([[\x01-\x09\x0b\x0c\x0e-\x1f"%&'*<=>@[_\|$extra])/'&#'.ord($1).';'/ge;

to

    s/([[\x01-\x1f"%&'*<=>@[_\|$extra])/'&#'.ord($1).';'/ge;

(see http://trac.foswiki.org/browser/trunk/MathModePlugin/lib/Foswiki/Plugins/MathModePlugin/Core.pm?rev=3649#L226 for context).

-- MichaelTempest - 20 Jun 2009

Michael, tested your fix. Works perfectly. Would you like to check it in?

-- MichaelDaum - 24 Jun 2009

Will do.

-- MichaelTempest - 24 Jun 2009

Done. Task closed.

-- MichaelTempest - 24 Jun 2009