代码：https://github.com/GNOME/orca
如果是看commit记录，这个git会更清楚，它和github是同步的：https://git.gnome.org/browse/orca/log/
Quickstart: https://wiki.gnome.org/Projects/Orca
开发者文档：ORCA_3_27_91/docs/doc-set/internals.html
Debug方法：https://wiki.gnome.org/Projects/Orca/Debugging
AT-SPI调试器accerciser
下面是Orca支持ibus-pinyin读屏的一些修改，它把原来的“panel, Chinese letter 1"换成"可替换的Chinese letter描述 1"。也可以改chnames.py，这样就对全局用户都产生影响了。
Orca doesn't have its own entries for these characters but you can add
them to your Orca customizations (which by default lives in
$HOME/.local/share/orca/orca-customizations.py). I did this with the
third candidate character like so:
import orca.chnames
orca.chnames.chnames['张'] = 'hello world'
Then when I arrowed among characters 1, 2, and 3 I got:
'在 1' (spoken as "chinese character 1")
'之 2' (spoken as "chinese character 2")
'hello world 3'
https://github.com/GNOME/orca/commit/e230e807da4d58b261437a4c24091e7779e13709
https://github.com/GNOME/orca/commit/615180b367c0a182d2d4321f5daf85e6b785112f
https://github.com/GNOME/orca/commit/73259738758abc7e104064dd9292ed9c86e88f14
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