Commit Graph

4 Commits

Author SHA1 Message Date
Pieter Noordhuis b2c03ea54c
Use `dyn.InvalidValue` to indicate absence (#1507)
## Changes

Previously, the functions `Get` and `Index` returned `dyn.NilValue` to
indicate that a map key or sequence index wasn't found. This is a valid
value, so we need to differentiate between actual absence and a real
`dyn.NilValue`. We do this with the zero value of a `dyn.Value` (also
captured in the constant `dyn.InvalidValue`).

## Tests

* Unit tests.
* Renamed `Get` and `Index` to find and update all call sites.
2024-06-19 15:24:57 +00:00
Pieter Noordhuis 26094f01a0
Define `dyn.Mapping` to represent maps (#1301)
## Changes

Before this change maps were stored as a regular Go map with string
keys. This didn't let us capture metadata (location information) for map
keys.

To address this, this change replaces the use of the regular Go map with
a dedicated type for a dynamic map. This type stores the `dyn.Value` for
both the key and the value. It uses a map to still allow O(1) lookups
and redirects those into a slice.

## Tests

* All existing unit tests pass (some with minor modifications due to
interface change).
* Equality assertions with `assert.Equal` no longer worked because the
new `dyn.Mapping` persists the order in which keys are set and is
therefore susceptible to map ordering issues. To fix this, I added a
`dynassert` package that forwards all assertions to `testify/assert` but
intercepts equality for `dyn.Value` arguments.
2024-03-25 11:01:09 +00:00
Pieter Noordhuis 8255c9d9fb
Make `Append` function to `dyn.Path` return independent slice (#1295)
## Changes

While working on #1273, I found that calls to `Append` on a
`dyn.Pattern` were mutating the original slice. This is expected because
appending to a slice will mutate in place if the capacity of the
original slice is large enough. This change updates the `Append` call on
the `dyn.Path` as well to return a newly allocated slice to avoid
inadvertently mutating the originals.

We have existing call sites in the `dyn` package that mutate a
`dyn.Path` (e.g. walk or visit) and these are modified to continue to do
this with a direct call to `append`. Callbacks that use the `dyn.Path`
argument outside of the callback need to make a copy to ensure it isn't
mutated (this is no different from existing semantics).

The `Join` function wasn't used and is removed as part of this change.

## Tests

Unit tests.
2024-03-19 09:49:26 +00:00
Pieter Noordhuis 938eb1600c
Rename libs/config -> libs/dyn (#1086)
## Changes

The name "dynamic value", or "dyn" for short, is more descriptive than
the opaque "config". Also, it conveniently does not alias with other
packages in the repository, or (popular ones) elsewhere.

(discussed with @andrewnester)

## Tests

n/a
2023-12-22 13:20:45 +00:00