This is the result of my tests so far:
treat-as-word-space doesn't have any effect. Looking at the compliance
page, it's listed as not supported!
By wrapping the thai text in a fo:inline, using a regular space as word
separator and setting word-spacing property, I get some results but I
haven't been able to get zero width on the spaces for non-justified
text. According to the spec, word-spacing is used to adjust the word
spacing "in addition to normal spacing", so I tried something like the
following:
<fo:inline word-spacing.minimum="-2em"
word-spacing.maximum="0.05em">Thai text with normal spaces as word
separators</fo:inline>
When justifying I do get some lines where the word spacing is zero, but
when justifying left, there's always some interword spacing. I tried
several values, but can't get it to zero.
One complication I have is how to know the "normal" word space so I can
adjust it to zero.
Anyway to get word-spacing optimum and minimum to zero?
Carlos
On 2/12/16 15:11, Glenn Adams wrote:
On Thu, Feb 11, 2016 at 9:23 PM, Carlos Villegas <c...@uniscope.jp> wrote:
I'm trying to use FOP 2.0 to render Thai language. FOP doesn't
really support Thai script
FOP does support Thai, at least glyph composition, though there
appears to be a few open issues (FOP-2092
<https://issues.apache.org/jira/browse/FOP-2092>, FOP-2355
<https://issues.apache.org/jira/browse/FOP-2355>). It is also true
that FOP is not presently performing line breaking in phrase internal
positions (FOP-2066 <https://issues.apache.org/jira/browse/FOP-2266>),
which proposes a solution to employ ICU and use dictionary based LB.
, so I'm using an external program (libthai) to do glyph
composition and word breaking.
Thai doesn't use spaces to separate words, so I was just inserting
zero width spaces to separate words. This works fine.
However, for justified text, these zero width spaces don't
stretch, so nothing happens, I get no justified text.
So, I tried to use fo:character with character set to zero width
space, and setting the letter-spacing.maximum to allow some
stretching.
Zero width space (U+200B) is not treated as a word separator space by
default. Have you tried something like:
<fo:character treat-as-word-space='true'>​</fo:character>
If that doesn't work, then keep in mind that letter spacing has no
meaning when applied to a single character, but applies to a sequence
of characters. Accordingly, I would try something like:
<fo:inline letter-spacing.minimum="0em"
letter-spacing.maximum="0.1em">​​</fo:inline>
or
<fo:inline letter-spacing.minimum="0em"
letter-spacing.maximum="0.1em">​<fo:character
treat-as-word-space='true'>​</fo:character></fo:inline>
If neither approach works, it may require some time with a visual
debugger, e.g., Eclipse, to step through the code and find out where
things go wrong.
But now FOP doesn't seem to treat the zero width space as such
this way, it doesn't break anymore at all!
Note that Thai does make use of regular spaces to separate
sentences and for other purposes but there's no guarantee that you
have spaces in a given paragraph or in case of long sentences.
Is there a way to insert a breakable space with minimum and
optimum to zero width and some small value for maximum?
Carlos
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