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2022-08-24 r/4462 fix(tvix/value): add ident_str representation of stringsVincent Ambo2-8/+25
When printing strings as identifiers (in attribute sets), the string should only be quoted and escaped if it contains escape characters. Change-Id: If2bcfa1e93dc8f00be4d7a57ec1d82fc679103c3 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6127 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi> Autosubmit: tazjin <tazjin@tvl.su>
2022-08-24 r/4459 fix(tvix/value): add escaping logic for Nix stringsVincent Ambo1-10/+46
Nix strings displayed to users must be escaped the same way as they are in C++ Nix. This adds the scaffolding for escapes, but is most likely not yet complete. Change-Id: Icfdcb2ac98d292c567ba894a92b6529a53e0cc17 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6124 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi>
2022-08-24 r/4458 fix(tvix/value): implement PartialOrd/PartialEq for stringsVincent Ambo1-1/+13
Instead of comparing the enum variants (which does not yield useful behaviour), compare &str representations of the string instead. Change-Id: I5e94b5f6c91b4561e1bc7c36d586f3d23c243764 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6112 Tested-by: BuildkiteCI Reviewed-by: eta <tvl@eta.st>
2022-08-24 r/4457 feat(tvix/value): introduce string representation with &'static strVincent Ambo2-19/+37
For cases where the strings are statically known (such as the oft-occuring name/value), this can be a useful optimisation. It's also much more convenient in tests. Change-Id: Ie462b684805bd4986ea5e85ca4bff663bc2d3c3c Reviewed-on: https://cl.tvl.fyi/c/depot/+/6111 Tested-by: BuildkiteCI Reviewed-by: eta <tvl@eta.st>
2022-08-24 r/4456 test(tvix/value): add simple attrset construction testsVincent Ambo3-0/+62
These do not yet test nested attribute sets; we need to add some more inspection primitives first. Change-Id: Icfc99bf17c73ebefc0d882a84f0ca73ec688a54d Reviewed-on: https://cl.tvl.fyi/c/depot/+/6110 Reviewed-by: eta <tvl@eta.st> Tested-by: BuildkiteCI
2022-08-24 r/4455 feat(tvix/value): implement nested attribute set literalsVincent Ambo1-14/+44
With this change, nested attribute sets can now be created from literals. This required some logic for dealing with cases where at a deeper nesting point a literal attribute set was constructed from an optimised representation. For example, this is valid Nix code: ```nix { a = {}; # creates optimised empty representation a.b = 1; # wants to add a `b = 1` to it b = { name = "foo"; value = "bar"; }; # creates optimised K/V repr b.foo = 42; # wants to add an additional `foo = 42` } ``` In these cases, the attribute set must be coerced to a map representation first which is achieved by the new internal NixAttr::map_mut helper. Change-Id: Ia61d3d9d14c4e0f5e207c00f6a2f4daa3265afb2 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6109 Reviewed-by: eta <tvl@eta.st> Tested-by: BuildkiteCI
2022-08-24 r/4454 refactor(tvix/value): encapsulate attrset logic within value::attrsVincent Ambo2-2/+191
The internal optimisations of the set representation were previously leaking into the VM, which is highly undesirable. Keeping it encapsulated allows us to do additional optimisations within value::attrs without being concerned about its use in the VM. Change-Id: I7e7020bb0983b9d355d3db747b049b2faa60131f Reviewed-on: https://cl.tvl.fyi/c/depot/+/6108 Reviewed-by: eta <tvl@eta.st> Tested-by: BuildkiteCI
2022-08-13 r/4441 refactor(tvix/value): explicitly implement PartialEq for valueVincent Ambo1-1/+26
There are some notions of equality (due to e.g. different backing variants for types, or Nix particularities) that don't work correctly when deriving PartialEq. Change-Id: Ide83ae67d051cc0b3ca89cefb283f17d0207acce Reviewed-on: https://cl.tvl.fyi/c/depot/+/6105 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi>
2022-08-13 r/4439 feat(tvix/eval): construct internal attribute path representationVincent Ambo1-0/+10
This is required for constructing nested attribute sets at runtime. There'll be quite a lot of optimisation potential with this solution eventually, if it should turn out to be a bottleneck. This introduces a conceptual change, in that the `Value` enum is now an enum representing "all runtime values" instead of "all Nix language types". This makes sense in general, as this type will also contain Chunk representations etc. which are not exposed to users. Change-Id: Ic5f72b2a0965b146c6a451efad34c6a81ca1aad8 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6103 Reviewed-by: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI
2022-08-13 r/4437 fix(tvix/value): KV struct needs to carry name as Value, tooVincent Ambo1-1/+2
Users may construct a pair that falls into the name/value optimisation but where `name` is not actually a string, as from the language perspective there is nothing special about this attribute set. We also can not conditionally apply this by forcing the key at this point, as this would change the language semantics. Therefore, the name in the optimised representation is also carried as `Value`. Change-Id: I5be8a4c98ba19ebdfb7203a929f714a04492512e Reviewed-on: https://cl.tvl.fyi/c/depot/+/6101 Reviewed-by: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI
2022-08-13 r/4436 feat(tvix/value): implement Display properly for listsVincent Ambo1-2/+8
Change-Id: I991d235cf52fbd42eb839b384f9c55ee64fa86c4 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6100 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi>
2022-08-13 r/4429 feat(tvix/value): add runtime representation of simple listsVincent Ambo2-0/+19
There might be more logic in the future to encapsulate different backing implementations of lists as well. Change-Id: Ib7064fab48bf88b0c8913b0ecfa2108177c7c9fd Reviewed-on: https://cl.tvl.fyi/c/depot/+/6093 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi> Autosubmit: tazjin <tazjin@tvl.su>
2022-08-13 r/4425 feat(tvix/value): add some necessary helpers for stringsVincent Ambo2-4/+14
Deriving Ord/Eq is required for the ordered BTreeMaps. Once interning is implemented this will require some extra magic for the sort order, but that's fine. Change-Id: I0c654648eb3609a4a01d84868c25f43a4d35bc2e Reviewed-on: https://cl.tvl.fyi/c/depot/+/6089 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi>
2022-08-13 r/4423 feat(tvix/eval): add Value variants for strings & attrsetsVincent Ambo3-4/+19
Change-Id: Idebf663ab7fde3955aae50f635320f7eb6c353e8 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6087 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi>
2022-08-13 r/4422 feat(tvix/eval): add module for attribute set implementationsVincent Ambo2-0/+37
Change-Id: I6002bd5e5596b93325dea6c862370ba5235c0f08 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6086 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi>
2022-08-13 r/4421 feat(tvix/eval): add module for string type implementationVincent Ambo2-0/+69
Change-Id: I5e4465acc4a676c10d7374b14f7a09240202b466 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6085 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi>