We give users the ability to edit Html/Pdf, but it's a little cumbersome
to use the edited Html for an Html file, and difficult to use it
for a Pdf. I believe we could make it fairly painless in both cases
by allowing the user to set a callback to edit the generated Html.
This can be accomplished with fewer than a dozen lines of very simple code.
I think this would be easier than grabbing the Html in pieces,
editing it, and reassembling it. I think it would also be simpler
than an alternative I considered, namely the addition of a new method
(e.g. saveEditedHtml) to each of the Html and Pdf writers.
One edit that users might like to make when editing html is to add
fallback fonts, something that is not currently available in
PhpSpreadsheet, and might be difficult to add. A natural extension to
that idea would be the use of webfonts, something which is guaranteed
difficult to add. See samples/Basic/17b_Html for an example of this.
None of the PDF writers support webfonts yet. That doesn't mean they
won't do so in future, but, for now, samples/Pdf/21a_Pdf is a prosaic
example of something you could do with this callback. In fact, this
opens the door to letting the user replace the entire body with data
of their choosing, effectively allowing PhpSpreadsheet (where you can
set things like paper size and orientation) to be used as a front-end to
the Pdf processor without the user having to be be overly familiar with
the vagaries of the PDF processor. I think this is actually a pretty
nice idea. YMMV. See samples/Basic/21b_Pdf for an example.
No code changes. The tests in all of these scripts write to at least
one temporary file, which is then read and not used again. The file
should be deleted to avoid filling up the disk system.
This test changes directory then performs an assertion.
No problem if the assertion succeeds. I was a little concerned about
what would happen if the assertion fails, leaving us in the
new directory. So I have changed test to use setUp/tearDown
to ensure that we end up where we started.
There are a number of situations where HTML write was producing
HTML which could not be validated. These include:
- inconsistent use of backslash terminating META, IMG, and COL tags
- @page style tags in body rather than header. Aside from being
non-standard, HTML Reader treats those as spreadsheet data.
- <div style="page-break-before:always" />, a construct which is
usually better handled through css anyhow.
- no alt tag for images (drawings and charts)
Other problems:
- Windows file names not handled correctly for images
- Memory drawings not handled in extendRowsForChartsAndImages
- No handling of different values for showing gridlines
for screen and print
- Mpdf and Dompdf do not require the use of inline css.
Tcpdf remains a holdout in the use of this inferior approach.
- no need to chunk base64 encoding of embedded images
- support for colors in number format was buggy (html tags
run through htmlspecialchars)
Code has been refactored when practical to reduce the number of
very large functions.
Coverage is now 100% for the entire HTML Writer module,
from 75% lines and 39% methods beforehand.
All functions dealing only with charts
are bypassed for coverage because the version of Jpgraph available in
Composer is not suitable for PHP7. The code will, nevertheless,
run successfully, but with warning messages. I have confirmed that
the code is entirely covered, without warnings, when the current
version of Jpgraph is used in lieu of the one available in Composer.
I will be glad to revisit this when the Jpgraph problem is resolved.
Directory PhpSpreadsheetTests/Writer/Html was created to house
the new tests. It seemed logical to move HtmlCommentsTest to
the new directory from PhpSpreadsheetTests/Functional.
A function to generate all the HTML is useful, especially for testing,
but also in lieu of the multiple other generate* functions. I have
added and documented generateHTMLAll.
The documentation for the generate* functions (a) produces invalid html,
(b) produces html which cannot be handled correctly by HTML reader,
and (c) even if those were correct, does not actually affect
the display of the spreadsheet. The documentation has been replaced
by a valid, and more instructive, example.
The (undocumented) useEmbeddedCss property, and the functions
to test and set it are no longer needed. Rather than breaking
existing code by deleting them, I marked the functions deprecated.
This change borrows a change to LocaleFloatsTest from
pull request 1456, submitted a little over a week before this one.
## Improve NumberFormat Support
First phase of this change included correcting NumberFormat handling
in HTML Writer. Certain complex formats could not be handled without
changes to Style/NumberFormat, and I did not wish to combine those changes.
Once the original change had been pushed, I took this part of it back up.
HTML Writer can now handle conditions in formats like:
[Blue][>=3000.5]$#,##0.00;[Red][<0]$#,##0.00;$#,##0.00
In testing, I discovered several errors and omissions
in handling of some other formats.
These are now corrected, and tests added.
Owen Leibman