`SpanLabel` was created during a very early refactoring of this system, and
I've just been fighting with it sense. This removes it, and simplifies
some things in the process.
It also makes clear that `Level` is never optional and removes the awkward
`Level::default` that was there previously; the default is now the lowest
level, which will always be able to be escalated.
DEV-12151
This does what the original proof-of-concept implementation did---skip a
span that was just processed, since it'll be squashed into the previous
anyway. These duplicate spans originate from the diagnostic system when
producing supplemental help information.
DEV-12151
Tests are large and will be getting larger. The source will also grow as
it's better documented and cleaned up. It's getting more difficult to
navigate efficiently and concurrently modify implementation and tests, and
parsing via LSP is getting slower with certain types of changes.
DEV-12151
Alright, starting to settle on an abstraction now, and things are coming
together. This gives us line numbers in the previously-empty gutter, and
widens the gutter to accommodate. Gutters are normalized across
sections. Sections are not yet collapsed for sequential line numbers in the
same context.
Exciting!
Here's an example, on an xmlo file:
error: expected closing tag for `preproc:symtable`
--> /home/.../foo.xmlo:16:4
|
16 | <preproc:symtable xmlns:map="http://www.w3.org/2005/xpath-functions/map">
| ----------------- note: element `preproc:symtable` is opened here
--> /home/.../foo.xmlo:11326:4
|
11326 | </preproc:wrong>
| ^^^^^^^^^^^^^^^^ error: expected `</preproc:symtable>`
DEV-12151
The `Section` itself is now responsible for outputting the gutter, which
puts us in a position to be able to apply consistent formatting without
having to propagate width data to every line variant.
Now `SourceLine` _does_ actually correspond to a line of output, which will
allow for better formatting (e.g. collapsing padding) and, importantly,
proper management of gutters.
Note that the seemingly unnecessary `SectionSourceLine` allows for a subtle
consistent formatting for all variants' gutters in `SectionLine`, which will
allow us to hoist that rendering out in the next commit. The other option
was to include a trailing space for padding and marks, but that is not only
sloppy and undesirable, but asking for confusion, especially in editors (like
mine) that trim trailing whitespace.
DEV-12151
If a column isn't present, it degrades to displaying labels like footnotes
anyway, so this simplifies the system rather than catering to a rare
case. With that said, this does lose functionality, since it does not
render the source line at all, even though we _could_ do so.
I may re-introduce that rendering after some further refactoring,
specifically for gutters.
DEV-12151
Using a byte vector just makes life more difficult with regard to preparing
the diagnostic reports. We're already validating UTF-8 data for column
generation, which is necessary for a robust report, so let's just store it
as a String to begin with.
DEV-12151
Note that, if a span is first encountered with a mark but with _no_ label,
the first label (if collapsed) will be on the next line. This allows a span
to be marked without extra visual noise if it's not necessary, and to be
able to trust that it'll stay that way.
Until coloring is introduced, this may or may not be easier to read
depending on context.
This is also not yet taking into account where on the line it begins, and so
may render poorly if the span is at the end of a line. That will be fixed
later on.
DEV-12151
This is now visible in the diagnostic output. Example at this point in
time, on an xmlo file for one of our smallest systems:
error: expected closing tag for `preproc:symtable`
--> /home/.../foo.xmlo:16:4
|
| <preproc:symtable xmlns:map="http://www.w3.org/2005/xpath-functions/map">
| -----------------
= note: element `preproc:symtable` is opened here
--> /home/.../foo.xmlo:11326:4
|
| </preproc:wrong>
| ^^^^^^^^^^^^^^^^
= error: expected `</preproc:symtable>`
DEV-12151
Looking more and more Rust-like. Shameless copy.
TBH I forget what character it uses for help, but it's easy enough to
change.
Also, to be clear: this is modeled after Rust, but it's not a requirement of
mine that it look exactly like it. I just like the general style; I'll
surely deviate over time, as appropriate (or as I feel like it).
DEV-12151
This has the effect of highlighting the columns of the source lines using
'^' as an underline.
The next step will be to have the underline character depend on the
`Level`.
If this commit message doesn't sound all that exciting, given what it
finally achieved after all this time, it's because I'm exhausted, and my
prototype has already taken my excitement. But this is significant, given
all the work leading up to it.
There is some code cleanup needed and some unit tests that ought to be
written rather than relying on integration, but considering how much this is
being refactored, I don't want to add to that refactoring cost just yet
before gutters are introduced and I know things are settled for now.
DEV-12151
This has been a lot of refactoring for something that I prototyped a week
ago, and the prototype is still further along in its output formatting (it
has line numbering in gutters and span markings).
But, this has come a long way, and I'm happy with it overall, though I'm not
happy with my slow pace and struggle to maintain focus. But those are
personal issues.
This leaves a lot to be desired, but at the same time is still really
helpful. There's a couple notable TODOs regarding pointless allocation and
UTF8 re-checking, but otherwise, the feature-related steps are:
- Gutters with line numbers; and
- Marking columns associated with the span.
DEV-12151
Rather than squashing as a separate operation, and explicitly denoting when
it occurred, we'll just always squash, as was done before these changes. It
doesn't really make sense to make this optional and there's not any value in
keeping the decision around.
This also sets us up favorably for future changes: it creates a vector of
labels, which can be analyzed later to determine how to best lay out marks
and labels.
DEV-12151
Just renames the lifetime to refer to the `Diagnostic`, rather than a
`Label` returned by it, which was all `'l` was previously used for.
Note that many labels have a `'static` lifetime; this doesn't change that or
somehow cause it to reallocate; the label must life _for at least `'d`_.
DEV-12151
Rather than rendering the diagnostic `Display` message to a string only to
copy it to yet another buffer later on, this simply stores a reference to
the `Diagnostic` that was provided. This also adds a type to the `Report`
associating it with the provided `Diagnostic`, which does seem appropriate,
given that the report was produced for it.
I should probably rename '{l=>d} now.
DEV-12151
Rather than writing to the provided `Write` object, this produces a `Report`
object. While a lifetime still exists for the diagnostic data (labels,
specifically), I was able to remove the other lifetime resulting from
`ResolvedSpan` by transferring ownership of the data to the `Report`
itself. Once actual source lines are integrated shortly, `Report` will
include those as well.
This has been a tedious process, but it's coming together. Hopefully these
commits documenting the progressive and ugly refactoring are found useful by
some reader in the future.
DEV-12151
The line number was getting special treatment that is simply not worth the
cost (with regards to how burdensome it is on the type definitions). This
simplifies things quite a bit.
If we want header customization in the future, we can worry about that in a
different way, or allow the header as a whole to be swapped out, rather than
its constituents.
DEV-12151
`HeadingColNum` is no longer constructed by `HeadingLineNum`. This both
narrows the types and required data (e.g. removing dummy values in test
cases), and reduces the coupling (by favoring composition, but still coupled
with the concrete type).
DEV-12151
I'm unhappy with the current state of this, which is why I haven't settled
on docs or unit tests for these changes yet (though note that the
integration tests do cover these changes)---this is still a prototype
refactoring.
In particular, this needs to do more lowering---the `ResolvedSpan` and
`MaybeResolvedSpan` need to be eliminated and lowered into exactly what is
needed so that we can stop reasoning about them and propagating them.
Further, having lines and columns lazily evaluate themselves for
display---based on `MaybeResolvedSpan`---adds extra generics that shouldn't
be necessary; they should be pre-computed and store the concrete data they
need in variants. Display shouldn't involve computation beyond formatting
of pre-computed data.
That was always the plan, but this refactoring has been incremental.
Anyway: this is in a working and integration-tested state, but it's going to
change.
DEV-12151
This generalizes the types a bit more and introduces unit tests. Note that
these are still also covered by integration tests.
The next step will be to finish generalizing
`<VisualReporter as Reporter>::render`, after which I'll get back to the
task of outputting the source line along with markings and labels.
DEV-12151
This is just to provide clarity. `ctx` is not so widely used that we
benefit from such a short identifier, and it's not worth the cognitive
burden of people unfamiliar with what it may mean.
DEV-12151
This is redundant with the `Endpoints` variant, although it did read
better. It's just another case to have to handle.
I was originally going to use `std::ops::RangeInclusive` for `Endpoints`,
however that struct also contains an extra bool indicating whether it was
exhausted (as an iterator), which isn't appropriate for this.
DEV-12151
This logic is still covered by the integration tests; I'll be adding unit
tests once it's decoupled to the point where that's possible, which should
be shortly, and after I make sure this is the route I do want to go down.
DEV-12151
This simplifies types and error handling since we will always have at least
one line, provided that the span is within the range of the context. To
ensure that, this patch introduces a new error.
DEV-12151
I did not initially introduce lifetimes because I wasn't sure how the system
was going to evolve, but now lifetimes are going to be needed in a number of
contexts. The core of TAMER is able to avoid lifetimes in most instances
because of its internment system, but its use is not appropriate for the
diagnostic system's buffers (beyond sourcing strings from already-interned
data).
DEV-12151
Determining the column number is not as simple as performing byte
arithmetic, because certain characters have different widths. Even if we
only accepted ASCII, control characters aren't visible to the user.
This uses the unicode-width crate as an alternative to POSIX wcwidth, to
determine (hopefully) the number of fixed-width cells that a unicode
character will take up on a terminal. For example, control characters are
zero-width, while an emoji is likely double-width. See test cases for more
information on that.
There is also the unicode-segmentation crate, which can handle extended
grapheme clusters and such, but (a) we'll be outputting the line to the
terminal and (b) there's no guarantee that the user's editor displays
grapheme clusters as a single column. LSP measures in UTF-16,
apparently. I use both Emacs and Vim from a terminal, so unicode-width
applies to me. There's too much variation to try to solve that right now.
The columns can be considered a visual span---this gives us enough
information to draw line annotations, which will happen soon.
Here are some useful links:
- https://hsivonen.fi/string-length/
- https://unicode.org/reports/tr29/
- https://github.com/rust-analyzer/rowan/issues/17
- https://www.reddit.com/r/rust/comments/gpw2ra/how_is_the_rust_compiler_able_to_tell_the_visible/
DEV-10935
This does not yet resolve columns, and omits the length of the span, but
it's starting to come together.
This is particularly exciting for me to see because I've been wanting line
numbers in TAME error messages for over a decade.
DEV-10935
This does adds support for rewinding the underlying buffer when necessary to
read a span that occurs earlier within the same context (which could also
include the same span read twice).
As part of this change, I cleaned up the code a bit. Working with this
system can be confusing with the different meanings of the byte offsets and
the different ways of interpreting lines relative to the span that is
provided. There's not a lot of code here, but it represents a lot of work
to get right.
This works, but it's ugly and requires some cleanup. It shows that there
are some interesting considerations when determining how to best represent
the location of spans to the user in a way that is intuitive.
This is not yet integrated with the reporter, which will require a layer to
load a `Context` from disk.
DEV-10935
This is a POC, minimal-effort integration that also creates the TamecError
sum type analogous to TameldError.
I'll work on reducing the boilerplate in the future.
A note regarding the type and boilerplate vs. dynamic dispatch, for any
future readers: the purpose of this is to be explicit about the error types
so that the system is self-documenting and it forces and understanding of
its error conditions. `Box<dyn Error>` is basically "eh idk anything can
happen!", which is not what I'm interested in having.
DEV-10935
This is a working concept that will continue to evolve. I wanted to start
with some basic output before getting too carried away, since there's a lot
of potential here.
This is heavily influenced by Rust's helpful diagnostic messages, but will
take some time to realize a lot of the things that Rust does. The next step
will be to resolve line and column numbers, and then possibly include
snippets and underline spans, placing the labels alongside them. I need to
balance this work with everything else I have going on.
This is a large commit, but it converts the existing Error Display impls
into Diagnostic. This separation is a bit verbose, so I'll see how this
ends up evolving.
Diagnostics are tied to Error at the moment, but I imagine in the future
that any object would be able to describe itself, error or not, which would
be useful in the future both for the Summary Page and for query
functionality, to help developers understand the systems they are writing
using TAME.
Output is integrated into tameld only in this commit; I'll add tamec
next. Examples of what this outputs are available in the test cases in this
commit.
DEV-10935
We can just use PathSymbolId directly and simplify things. Typing can (and
should) happen on the symbol itself, and if we want a separate symbol type,
it ought to have its own interner.
For now, it doesn't, and having this extra type is just a PITA.
DEV-10935
There's no use in complicating the error handling here when we'd just
default to `UNKNOWN_SPAN` anyway when trying to render it. `UNKNOWN_SPAN`
didn't exist at the time of writing.
DEV-10935
This entirely removes the old XmloReader that has since been replaced with a
XIR-based reader.
I had been holding off on this because the new reader is slower, pending
performance optimizations (which I'll do a little later on), however the
performance loss is of no practical consideration and only affects the
linker, which is still fast.
Therefore, it's better to get this old code out of the way to simplify
refactoring going forward. In particular, I'm working on the diagnostic
system.
This is a little sad, in a way---this is some of my first Rust code that I'm
deleting.
DEV-10935
This does not deal directly with XIRF (that's composed into a pipeline
outside of this parser).
I'd like to clean up further...perhaps I should retire the
wip-xmlo-xir-reader flag now, despite the minor performance regression (see
previous recent commits for explanation).
DEV-10935
This aggregates all non-panic errors that can occur during link time, making
`Box<dyn Error>` unnecessary. I've been wanting to do this for a long time,
so it's nice seeing this come together. This is a powerful tool, in that we
know, at compile time, all errors that can occur, and properly report on
them and compose them. This method of error composition ensures that all
errors have a chance to be handled within their context, though it'll take
time to do so in a decent way.
This just maintains compatibility with the dynamic dispatch that was
previous occurring. This work is being done to introduce the initial
diagnostic system, which was really difficult/confusing to do without proper
errors types at the top level, considering the toplevel is responsible for
triggering the diagnostic reporting.
The cycle error is in particular going to be interesting once the system is
in place, especially once it provides spans in the future, since it will
guide the user through the code to understand how the cycle formed.
More to come.
DEV-10935
Mike Gerwitz