[reportlab-users] Possible bug in line wrapping

[Robin Becker]

Roberto Alsina wrote:

> This is hard to trigger, but it seems that if there is a linebreak immediately 

> after a link, the line doesn't break.

> 

> Here is a test case which produced the attached PDF:

> 

........

> go()

.......
yes that looks like a bug. Modifying your example shows it's the second a tag 
that causes the problem


> from reportlab.platypus import SimpleDocTemplate, Paragraph

> from reportlab.lib.styles import ParagraphStyle

> from reportlab.lib.styles import getSampleStyleSheet

> from reportlab.lib.enums import TA_JUSTIFY

> 

> def go():

> 	styles = getSampleStyleSheet()

> 	doc = SimpleDocTemplate("phello.pdf")

> 	style = styles['Normal']

> 	style.alignment=TA_JUSTIFY

> 	p1 = Paragraph('''PADDING PADDING PADDING PADDING PADDING PADDING The 

> computer will always be better than you at parsing SQL

> and the bad guys have years of experience finding and using <a 

> href="http://en.wikipedia.org/wiki/SQL_injection" color="navy">SQL

> injection attacks</a><a name="sql-injection-attacks"/> in

> ways you never even thought possible.''', style)

> 	p2 = Paragraph('''PADDING PADDING PADDING PADDING PADDING PADDING The 

> computer will always be better than you at parsing SQL

> and the bad guys have years of experience finding and using <font color="navy">SQL

> injection attacks</font><a name="sql-injection-attacks"/> in

> ways you never even thought possible.''', style)

> 	p3 = Paragraph('''PADDING PADDING PADDING PADDING PADDING PADDING The 

> computer will always be better than you at parsing SQL

> and the bad guys have years of experience finding and using <font color="navy">SQL

> injection attacks</font><font/>in

> ways you never even thought possible.''', style)

> 	doc.build([p1,p2,p3])

> 

> go()


p1 and p2 cause a problem so the first <a> tag is not a cause as in p2 it's 
replaced by <font>. In p3 eplacing the second <a> tag by <font/> allows the 
break to happen.

Given that the anchor form was recently added I tried the following fix in 
paragraph line 237 change

elif kind=='img':

to

elif kind in ('img','anchor'):

which seems to fix the problem at least in this example. Can you see if this 
resolves the problem for you?
-- 
Robin Becker