## What is scrptrun and srtest?

The ICU LayoutEngine must be called with text in a single script. scrptrun.h and scrptrun.cpp implement the ScriptRun class, which can be used to find runs of text that is in a single script. It uses a basic iteration interface.

srtest is a little program that tests ScriptRun. You can use it as an example of how to use ScriptRun. Here's what the output should look like:

> Script 'DEVANAGARI' from 0 to 9.
> Script 'ARABIC' from 9 to 17.
> Script 'CYRILLIC' from 17 to 25.
> Script 'LATIN' from 25 to 33.
> Script 'HAN' from 33 to 35.
> Script 'HIRAGANA' from 35 to 41.
> Script 'KATAKANA' from 41 to 45.
> Script 'DESERET' from 45 to 53.

## How do I build scrptrun and srtest?

To use the ScriptRun class in a Windows application, just include scrptrun.h and scrptrun.cpp right out of the <icu>\source\extra\scrptrun directory into your project. You'll also need to add the <icu>\source]extra\scrptrun directory to the "Additional include directories" section of the "Preprocessor" category on the "C/C++" tab in the project settings.

On UNIX systems the simplest thing to do is to just copy scrptrun.h and scrptrun.cpp into your source directory. If you want to use them from <icu>/source/extra/scrpturn, it's a bit trickier: the default dependency rules don't work on source files in a different directory. You need to add separate dependency rules for scrptrun.o and scrptrun.d. See <icu>/source/samples/layout/Makefile.in for an example of how to do this. You'll also have to add -I$(top_srcdir)/extra/scrptrun to your compiler flags so that the compiler can find scrptrun.h. If your application has to build on multiple UNIX platforms, it might be difficult to wirte dependency rules that will work correctly on all platforms. In that case, you're probably better off copying the scrpturn files to your source directory.

Building srtest is easy, on Windows build the srtest workspace in <icu>\source\extra\scrptrun. On UNIX, connect to <top-build-dir>/extra/scrptrun and do "make all"

## Notes

- ScriptRun is based on Unicode Technical Report #24 but the implementation is not complete. In particular the support for paired punctuation is only a prototype. A complete implementation will be added to ICU in the future.