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string-set '' doesn't clear previous value from named string [43rc1 regression] #726

Smylers opened this issue Nov 1, 2018 · 3 comments


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@Smylers Smylers commented Nov 1, 2018

string-set: foo '' used to clear the named string. It now seems to be ignored, leaving the previous value in there.


<!DOCTYPE html>
<title>Clear String Check</title>
@page { @top-left  { content: '[' string(left) ']' } }
p { page-break-before: always }
.initial { -weasy-string-set: left 'initial' }
.empty   { -weasy-string-set: left ''        }
.space   { -weasy-string-set: left ' '       }

<p class=initial>Initial
<p class=empty  >Empty
<p class=space  >Space

In WeasyPrint 0.39, the three page headings are the expected “[initial]”, “[]”, and “[ ]”. But in 43rc1, the middle one is still “[initial]”.

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@Tontyna Tontyna commented Nov 1, 2018

reason is if text: condition in in line 403 and line 297

@liZe any bad side-effects expected when changed to if len(tests) > 0: ?

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@liZe liZe commented Nov 2, 2018

Oops, forgot this issue.

@liZe any bad side-effects expected when changed to if len(tests) > 0: ?

Probably not, I'll change this.

@liZe liZe closed this in 3ca9941 Nov 2, 2018
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@liZe liZe commented Nov 2, 2018

Probably not, I'll change this.

It actually was a bit more complicated than this, as compute_content_list has to return something when the string is empty, but empty text boxes are not allowed.

I used None when nothing has been found and [] when something has been found but didn't create a box.

@liZe liZe added this to the 43 milestone Nov 2, 2018
netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this issue Nov 14, 2018
Version 43

Released on 2018-11-09.

Bug fixes:

* `#726 <>`_:
  Make empty strings clear previous values of named strings
* `#729 <>`_:
  Include tools in packaging

This version also includes the changes from unstable rc1 and rc2 versions
listed below.

Version 43rc2

Released on 2018-11-02.

**This version is experimental, don't use it in production. If you find bugs,
please report them!**

Bug fixes:

* `#706 <>`_:
  Fix text-indent at the beginning of a page
* `#687 <>`_:
  Allow query strings in file:// URIs
* `#720 <>`_:
  Optimize minimum size calculation of long inline elements
* `#717 <>`_:
  Display <details> tags as blocks
* `#691 <>`_:
  Don't recalculate max content widths when distributing extra space for tables
* `#722 <>`_:
  Fix bookmarks and strings set on images
* `#723 <>`_:
  Warn users when string() is not used in page margin

Version 43rc1

Released on 2018-10-15.

**This version is experimental, don't use it in production. If you find bugs,
please report them!**


* Python 3.4+ is now needed, Python 2.x is not supported anymore
* Cairo 1.15.4+ is now needed, but 1.10+ should work with missing features
  (such as links, outlines and metadata)
* Pdfrw is not needed anymore

New features:

* `Beautiful website <>`_
* `#579 <>`_:
  Initial support of flexbox
* `#592 <>`_:
  Support @font-face on Windows
* `#306 <>`_:
  Add a timeout parameter to the URL fetcher functions
* `#594 <>`_:
  Split tests using modern pytest features
* `#599 <>`_:
  Make tests pass on Windows
* `#604 <>`_:
  Handle target counters and target texts
* `#631 <>`_:
  Enable counter-increment and counter-reset in page context
* `#622 <>`_:
  Allow pathlib.Path objects for HTML, CSS and Attachment classes
* `#674 <>`_:
  Add extensive installation instructions for Windows

Bug fixes:

* `#558 <>`_:
  Fix attachments
* `#565 <>`_,
  `#596 <>`_,
  `#539 <>`_:
  Fix many PDF rendering, printing and compatibility problems
* `#614 <>`_:
  Avoid crashes and endless loops caused by a Pango bug
* `#662 <>`_:
  Fix warnings and errors when generating documentation
* `#666 <>`_,
  `#685 <>`_:
  Fix many table layout rendering problems
* `#680 <>`_:
  Don't crash when there's no font available
* `#662 <>`_:
  Fix support of some align values in tables
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