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Has anyone implemented the import of YAML data files into Mathematica? I suppose some sort of transformation into a nested list of rules would be the way to do it. Thanks

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  • $\begingroup$ There are many YAML parsers for Java, and Mathematica has J/Link. It should be possible to use those two together. $\endgroup$
    – Gustavo Delfino
    Sep 30, 2014 at 12:46

3 Answers 3

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I wrote such a cross-platform tool to convert other formats to wolfram format: WolframExchange

Usage

wex in.yml      # check file but no output
wex in.yml -t   # output only text
wex in.yml -c   # output only binary
wex in.yml -ct  # output both text and binary

Result

enter image description here

enter image description here

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    $\begingroup$ This is very cool! $\endgroup$
    – b3m2a1
    Mar 23, 2020 at 8:30
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I just wrote an importer: https://github.com/zbjornson/MYaml. It's built on SnakeYAML and supports all language-independent types.

Example 2.10 from the spec:

In[1]:= ImportString["---
 hr:
   - Mark McGwire
   # Following node labeled SS
   - &SS Sammy Sosa
 rbi:
   - *SS # Subsequent occurrence
   - Ken Griffey", "YAML"]
Out[1]= {
          "hr" -> {"Mark McGwire", "Sammy Sosa"}, 
          "rbi" -> {"Sammy Sosa", "Ken Griffey"}
        }

More examples in the test suite.

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    $\begingroup$ For demonstration purposes, can you show how your importer acts on a sample YAML file? $\endgroup$
    – J. M.'s eventual burnout ♦
    Oct 12, 2016 at 3:21
  • $\begingroup$ @J.M. good call, added an example. $\endgroup$
    – ZachB
    Oct 12, 2016 at 5:42
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    $\begingroup$ Consider posting it on packagedata.net too $\endgroup$
    – Szabolcs
    Oct 12, 2016 at 6:41
  • $\begingroup$ Another importer was written just a few days ago, see at the end of comment thread here: mathematica.stackexchange.com/q/127300/12 $\endgroup$
    – Szabolcs
    Oct 12, 2016 at 6:43
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    $\begingroup$ @JessRiedel You're correct. I'm not on a computer with M right now but can double check in the morning that a fresh install works. What version of M are you using? You can try manually loading this file to register the importer, something like << FileNameJoin[{$BaseDirectory, "SystemFiles", "Formats", "YAML", "Import.m"}]. $\endgroup$
    – ZachB
    Sep 6, 2018 at 2:21
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If you cannot find a YAML importer, consider converting the YAML to JSON and importing that. It'll give you the list of rules you'd expect.

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