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# Reaclib to Header File Utility
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This utility module provides a script to convert reaclib2 format (with chapters
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9, 10, and 11) data into a c++ header file formated for use within SERiF. This
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script uses preprocessor directives to ensure that the only reactions included
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are ones for which all reactants and products are defined. That is to say that
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at compile time this will cull any reaction for which we do not have data from
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AME2020. One effect of this is that the non-elemental reactions which reaclib
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traces (such as things like nrf, and pkrf) are not included in the reaction
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library.
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## Usage
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There are no dependencies which are not part of a standard python installation
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You will however need to provide the reaclib2 formated file. This can be downloaded from
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the [reaclib snapshot library](https://reaclib.jinaweb.org/library.php?action=viewsnapshots).
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Assuming you download that file to your ~/Downloads directory, and it is called something like
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`results123` then usage is as simple as
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```bash
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python format.py ~/Downloads/results123 -o reaclib.h
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```
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This will generate the `reaclib.h` header file in your current directory.
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> The c and T flags are optional, but they are used to set the culling parameter. c is the minimum rate
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that a reaction must have to be included in the header file and T is the T9 temperature to evaluate that
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rate at. Without culling (when -c is set to 0 or not set) the header file may be very large.
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In order to make a translation unit `reaclib.h` depends on `atomicSpecies.h`
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which is another header file automatically generated by a utility module (utils/atomic).
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> `atomicSpecies.h` provides the Species structs which are used to ensure that only reactions
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where the reactants and products are species in AME2020 are included. This pretty significantly
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cuts down on compiled binary size. This is done using preprocessor directives.
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Once `reaclib.h` has been generated you can recompile `SERiF` with it simply by
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running the following (from your `SERiF` root directory and assuming
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`reaclib.h` is in `SERiF/utils/reaclib`)
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```bash
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mv assets/static/reaclib/reaclib.h assets/static/reaclib/reaclib.h.bak
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cp utils/reaclib/reaclib.h assets/static/reaclib/reaclib.h
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meson compile -C build
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```
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> All tests are run with the bundled reaclib.h based on a checkout of the
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reaclib default snapshot on June 17th, 2025 where the most recent documented
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change was on June 24th, 2021. This means that if you update reaclib.h some
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tests may fail.
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## For Developers
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If you are updating the default reaclib.h file, please ensure that you also
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update any relevant tests and documentation to reflect the changes made.
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Further, if in the future the parser needs updating, please ensure that
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those changes get upstreamed into this utility script. It is a key development guideline
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that all of our tools are well documented and easy for non `SERiF` developers
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to use.
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## Citations
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REACLIB:
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- Rauscher, T., Heger, A., Hoffman, R. D., & Woosley, S. E. 2010, ApJS, 189, 240.
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