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Support poorly formatted Material definitions #182

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MicahGale opened this issue Sep 15, 2023 · 2 comments
Open

Support poorly formatted Material definitions #182

MicahGale opened this issue Sep 15, 2023 · 2 comments
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@MicahGale
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feature request An issue that improves the user interface. lanl did something When LANL makes a change to MCNP that needs to be evaluated. parsers are hard Examples of where MCNP syntax is complicated and should be simplified.

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@MicahGale
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LANL apparently doesn't know how to write a syntax specification. From LA-UR-17-29981 Section 3.3.2.1 a material specification shall take the form:

Mm zaid1 fraction1 zaid2 fraction2 ... [KEYWORD=value(s) ...]

Which makes sense.

Until you notice

Input Parameter Description
Keyword * Value

And finally notice the asterisk:

* M card keywords may appear anywhere among the zaid-fraction pairs, but must not separate a pair.

Yep The syntax specification from before is a lie. The key-value pairs can appear anywhere they like!

Why did the developers do this? I don't know.

Is this a context-free grammar? Probably not.

However, it is officially (in the worst documented ways possible) supported, so it needs to be supported in MOntePy.
@MicahGale
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I am leaning towards possibly just raising UnsupportedFeature and just moving on.

@MicahGale MicahGale mentioned this issue Sep 4, 2024
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@MicahGale MicahGale self-assigned this Sep 4, 2024
@MicahGale MicahGale mentioned this issue Sep 11, 2024
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@MicahGale MicahGale added the parsers are hard Examples of where MCNP syntax is complicated and should be simplified. label Sep 11, 2024
MicahGale added a commit that referenced this issue Oct 12, 2024
@MicahGale
Added test for #182.
4c3379f
@MicahGale
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MicahGale commented Oct 24, 2024 •
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So I managed to fix this in #507 with 1f14326. Should we prioritize to ship this before 1.0.0 with a few cherry-picks? @tjlaboss

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feature request An issue that improves the user interface. lanl did something When LANL makes a change to MCNP that needs to be evaluated. parsers are hard Examples of where MCNP syntax is complicated and should be simplified.
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