There are some code pages with "unmapped" code points in the C1 range,
which results in them being translated into Unicode C1 control codes,
even though that is not their intended use. To avoid having these
characters triggering unintentional escape sequences, this PR now
disables C1 controls by default.
Switching to ISO-2022 encoding will re-enable them, though, since that
is the most likely scenario in which they would be required. They can
also be explicitly enabled, even in UTF-8 mode, with the `DECAC1` escape
sequence.
What I've done is add a new mode to the `StateMachine` class that
controls whether C1 code points are interpreted as control characters or
not. When disabled, these code points are simply dropped from the
output, similar to the way a `NUL` is interpreted.
This isn't exactly the way they were handled in the v1 console (which I
think replaces them with the font _notdef_ glyph), but it matches the
XTerm behavior, which seems more appropriate considering this is in VT
mode. And it's worth noting that Windows Explorer seems to work the same
way.
As mentioned above, the mode can be enabled by designating the ISO-2022
coding system with a `DOCS` sequence, and it will be disabled again when
UTF-8 is designated. You can also enable it explicitly with a `DECAC1`
sequence (originally this was actually a DEC printer sequence, but it
doesn't seem unreasonable to use it in a terminal).
I've also extended the operations that save and restore "cursor state"
(e.g. `DECSC` and `DECRC`) to include the state of the C1 parser mode,
since it's closely tied to the code page and character sets which are
also saved there. Similarly, when a `DECSTR` sequence resets the code
page and character sets, I've now made it reset the C1 mode as well.
I should note that the new `StateMachine` mode is controlled via a
generic `SetParserMode` method (with a matching API in the `ConGetSet`
interface) to allow for easier addition of other modes in the future.
And I've reimplemented the existing ANSI/VT52 mode in terms of these
generic methods instead of it having to have its own separate APIs.
## Validation Steps Performed
Some of the unit tests for OSC sequences were using a C1 `0x9C` for the
string terminator, which doesn't work by default anymore. Since that's
not a good practice anyway, I thought it best to change those to a
standard 7-bit terminator. However, in tests that were explicitly
validating the C1 controls, I've just enabled the C1 parser mode at the
start of the tests in order to get them working again.
There were also some ANSI mode adapter tests that had to be updated to
account for the fact that it has now been reimplemented in terms of the
`SetParserMode` API.
I've added a new state machine test to validate the changes in behavior
when the C1 parser mode is enabled or disabled. And I've added an
adapter test to verify that the `DesignateCodingSystems` and
`AcceptC1Controls` methods toggle the C1 parser mode as expected.
I've manually verified the test cases in #10069 and #10310 to confirm
that they're no longer triggering control sequences by default.
Although, as I explained above, the C1 code points are completely
dropped from the output rather than displayed as _notdef_ glyphs. I
think this is a reasonable compromise though.
Closes#10069Closes#10310
This PR adds support for the `DECRQSS` (Request Selection or Setting)
escape sequence, which is a standard VT query for reporting the state of
various control functions. This initial implementation only supports
queries for the `DECSTBM` margins, and the `SGR` graphic rendition
attributes.
This can be useful for certain forms of capability detection (#1040). As
one example in particular, it can serve as an alternative to the
`COLORTERM` environment variable for detecting truecolor support
(#11057).
Of the settings that can be queried by `DECRQSS`, the only other one
that we could be supporting at the moment is `DECSCUSR` (Cursor Style).
However, that would require passing the query through to the conpty
client, which is a lot more complicated, so I thought it best to leave
for a future PR.
For now this gets the basic framework in place, so we are at least
responding to queries, and even just supporting the `SGR` attributes
query is useful in itself.
Validation
----------
I've added a unit test verifying the reports for the `DECSTBM` and `SGR`
settings with a range of different parameters. I've also tested the
`DECSTBM` and `SGR` reports manually in _Vttest_, under menu 11.2.5.3.6
(Status-String Reports).
This PR adds conhost support for downloadable soft fonts - also known as
dynamically redefinable character sets (DRCS) - using the `DECDLD`
escape sequence.
These fonts are typically designed to work on a specific terminal model,
and each model tends to have a different character cell size. So in
order to support as many models as possible, the code attempts to detect
the original target size of the font, and then scale the glyphs to fit
our current cell size.
Once a font has been downloaded to the terminal, it can be designated in
the same way you would a standard character set, using an `SCS` escape
sequence. The identification string for the set is defined by the
`DECDLD` sequence. Internally we map the characters in this set to code
points `U+EF20` to `U+EF7F` in the Unicode private use are (PUA).
Then in the renderer, any characters in that range are split off into
separate runs, which get painted with a special font. The font itself is
dynamically generated as an in-memory resource, constructed from the
downloaded character bitmaps which have been scaled to the appropriate
size.
If no soft fonts are in use, then no mapping of the PUA code points will
take place, so this shouldn't interfere with anyone using those code
points for something else, as along as they aren't also trying to use
soft fonts. I also tried to pick a PUA range that hadn't already been
snatched up by Nerd Fonts, but if we do receive reports of a conflict,
it's easy enough to change.
## Validation Steps Performed
I added an adapter test that runs through a bunch of parameter
variations for the `DECDLD` sequence, to make sure we're correctly
detecting the font sizes for most of the known DEC terminal models.
I've also tested manually on a wide range of existing fonts, of varying
dimensions, and from multiple sources, and made sure they all worked
reasonably well.
Closes#9164
This PR introduces a mechanism via which DCS data strings can be passed
through directly to the dispatch method that will be handling them, so
the data can be processed as it is received, rather than being buffered
in the state machine. This also simplifies the way string termination is
handled, so it now more closely matches the behaviour of the original
DEC terminals.
* Initial support for DCS sequences was introduced in PR #6328.
* Handling of DCS (and other) C1 controls was added in PR #7340.
* This is a prerequisite for Sixel (#448) and Soft Font (#9164) support.
The way this now works, a `DCS` sequence is dispatched as soon as the
final character of the `VTID` is received. Based on that ID, the
`OutputStateMachineEngine` should forward the call to the corresponding
dispatch method, and its the responsibility of that method to return an
appropriate handler function for the sequence.
From then on, the `StateMachine` will pass on all of the remaining bytes
in the data string to the handler function. When a data string is
terminated (with `CAN`, `SUB`, or `ESC`), the `StateMachine` will pass
on one final `ESC` character to let the handler know that the sequence
is finished. The handler can also end a sequence prematurely by
returning false, and then all remaining data bytes will be ignored.
Note that once a `DCS` sequence has been dispatched, it's not possible
to abort the data string. Both `CAN` and `SUB` are considered valid
forms of termination, and an `ESC` doesn't necessarily have to be
followed by a `\` for the string terminator. This is because the data
string is typically processed as it's received. For example, when
outputting a Sixel image, you wouldn't erase the parts that had already
been displayed if the data string is terminated early.
With this new way of handling the string termination, I was also able to
simplify some of the `StateMachine` processing, and get rid of a few
states that are no longer necessary. These changes don't apply to the
`OSC` sequences, though, since we're more likely to want to match the
XTerm behavior for those cases (which requires a valid `ST` control for
the sequence to be accepted).
## Validation Steps Performed
For the unit tests, I've had to make a few changes to some of the
`OutputEngineTests` to account for the updated `StateMachine`
processing. I've also added a new `StateMachineTest` to confirm that the
data strings are correctly passed through to the string handler under
all forms of termination.
To test whether the framework is actually usable, I've been working on
DRCS Soft Font support branched off of this PR, and haven't encountered
any problems. To test the throughput speed, I also hacked together a
basic Sixel parser, and that seemed to perform reasonably well.
Closes#7316
This PR adds support for the VT line rendition attributes, which allow
for double-width and double-height line renditions. These renditions are
enabled with the `DECDWL` (double-width line) and `DECDHL`
(double-height line) escape sequences. Both reset to the default
rendition with the `DECSWL` (single-width line) escape sequence. For now
this functionality is only supported by the GDI renderer in conhost.
There are a lot of changes, so this is just a general overview of the
main areas affected.
Previously it was safe to assume that the screen had a fixed width, at
least for a given point in time. But now we need to deal with the
possibility of different lines have different widths, so all the
functions that are constrained by the right border (text wrapping,
cursor movement operations, and sequences like `EL` and `ICH`) now need
to lookup the width of the active line in order to behave correctly.
Similarly it used to be safe to assume that buffer and screen
coordinates were the same thing, but that is no longer true. Lots of
places now need to translate back and forth between coordinate systems
dependent on the line rendition. This includes clipboard handling, the
conhost color selection and search, accessibility location tracking and
screen reading, IME editor positioning, "snapping" the viewport, and of
course all the rendering calculations.
For the rendering itself, I've had to introduce a new
`PrepareLineTransform` method that the render engines can use to setup
the necessary transform matrix for a given line rendition. This is also
now used to handle the horizontal viewport offset, since that could no
longer be achieved just by changing the target coordinates (on a double
width line, the viewport offset may be halfway through a character).
I've also had to change the renderer's existing `InvalidateCursor`
method to take a `SMALL_RECT` rather than a `COORD`, to allow for the
cursor being a variable width. Technically this was already a problem,
because the cursor could occupy two screen cells when over a
double-width character, but now it can be anything between one and four
screen cells (e.g. a double-width character on the double-width line).
In terms of architectural changes, there is now a new `lineRendition`
field in the `ROW` class that keeps track of the line rendition for each
row, and several new methods in the `ROW` and `TextBuffer` classes for
manipulating that state. This includes a few helper methods for handling
the various issues discussed above, e.g. position clamping and
translating between coordinate systems.
## Validation Steps Performed
I've manually confirmed all the double-width and double-height tests in
_Vttest_ are now working as expected, and the _VT100 Torture Test_ now
renders correctly (at least the line rendition aspects). I've also got
my own test scripts that check many of the line rendition boundary cases
and have confirmed that those are now passing.
I've manually tested as many areas of the conhost UI that I could think
of, that might be affected by line rendition, including things like
searching, selection, copying, and color highlighting. For
accessibility, I've confirmed that the _Magnifier_ and _Narrator_
correctly handle double-width lines. And I've also tested the Japanese
IME, which while not perfect, is at least useable.
Closes#7865
Implement the `XTPUSHSGR` and `XTPOPSGR` control sequences (see #1796).
This change adds a new pair of methods to `ITermDispatch`:
`PushGraphicsRendition` and `PopGraphicsRendition`, and then plumbs the
change through `AdaptDispatch`, `TerminalDispatch`, `ITerminalApi` and
`TerminalApi`.
The stack logic is encapsulated in the `SgrStack` class, to allow it to
be reused between the two APIs (`AdaptDispatch` and `TerminalDispatch`).
Like xterm, only ten levels of nesting are supported.
The stack is implemented as a "ring stack": if you push when the stack
is full, the bottom of the stack will be dropped to make room.
Partial pushes (see the description of `XTPUSHSGR` in Issue #1796) are
implemented per xterm spec.
## Validation Steps Performed
Tests added, plus manual verification of the feature.
Closes#1796
This PR adds support for the `DECID` (Identify Device) escape sequence,
which allows for querying the terminal type in a way that is backwards
compatible with VT52 terminals.
This simply checks for the `ESC Z` sequence in the `ActionEscDispatch`
method of output state machine, and forwards the query to the existing
`DeviceAttributes` dispatch method, since the expected response is
identical to a `DA` report.
## Validation Steps Performed
I've added an output engine test that verifies that the `ESC Z` sequence
is correctly interpreted as a `DA` query when in ANSI mode, and as a
VT52 identification query when in VT52 mode.
Closes#8857
This commit implements the OSC 9;4 sequence per the [ConEmu style].
| sequence | description |
| ------------ | ------------ |
| `ESC ] 9 ; 4 ; st ; pr ST` | Set progress state on taskbar and tab. |
| | When `st` is: |
| | |
| | `0`: remove progress. |
| | `1`: set progress value to `pr` (number, 0-100). |
| | `2`: set the taskbar to the "Error" state |
| | `3`: set the taskbar to the "Indeterminate" state |
| | `4`: set the taskbar to the "Warning" state |
We've also extended this with:
* st 3: set indeterminate state
* st 4: set paused state
We handle multiple tabs sending the sequence by using the the last focused
control's taskbar state/progress.
Upon receiving the sequence in `TerminalApi`, we send an event that gets caught
by `TerminalPage`. `TerminalPage` then fires another event that gets caught by
`AppHost` and that's where we set the taskbar progress.
Closes#3004
[ConEmu style]: https://conemu.github.io/en/AnsiEscapeCodes.html#ConEmu_specific_OSC
This PR adds support for the `DECREQTPARM` (Request Terminal Parameters)
escape sequence, which was originally used on the VT100 terminal to
report the serial communication parameters. Modern terminal emulators
simply hardcode the reported values for backward compatibility.
The `DECREQTPARM` sequence has one parameter, which was originally used
to tell the terminal whether it was permitted to send unsolicited
reports or not. However, since we have no reason to send an unsolicited
report, we don't need to keep track of that state, but the permission
parameter does still determine the value of the first parameter in the
response.
The response parameters are as follows:
| Parameter | Value | Meaning |
| ---------------- | ------ | ------------------------ |
| response type | 2 or 3 | unsolicited or solicited |
| parity | 1 | no parity |
| data bits | 1 | 8 bits per character |
| transmit speed | 128 | 38400 baud |
| receive speed | 128 | 38400 baud |
| clock multiplier | 1 | |
| flags | 0 | |
There is some variation in the baud rate reported by modern terminal
emulators, and 9600 baud seems to be a little more common than 38400
baud, but I thought the higher speed was probably more appropriate,
especially since that's also the value reported by XTerm.
## Validation Steps Performed
I've added a couple of adapter and output engine tests to verify that
the sequence is dispatched correctly, and the expected responses are
generated. I've also manually tested in Vttest and confirmed that we now
pass the `DECREQTPARM` test in the _Test of terminal reports_.
Closes#7852
This PR introduces a pair of classes for managing VT parameters that
automatically handle range checking and default fallback values, so the
individual operations don't have to do that validation themselves. In
addition to simplifying the code, this fixes a few cases where we were
mishandling missing or extraneous parameters, and adds support for
parameter sequences on commands that couldn't previously handle them.
This PR also sets a limit on the number of parameters allowed, to help
thwart DoS memory consumption attacks.
## References
* The new parameter class also introduces the concept of an
omitted/default parameter which is not necessarily zero, which is a
prerequisite for addressing issue #4417.
## Detailed Description of the Pull Request / Additional comments
There are two new classes provide by this PR: a `VTParameter` class,
similar in function to a `std::optional<size_t>`, which holds an
individual parameter (which may be an omitted/default value); and a
`VTParameters` class, similar in function to `gsl:span<VTParameter>`,
which holds a sequence of those parameters.
Where `VTParameter` differs from `std::optional` is with the inclusion
of two cast operators. There is a `size_t` cast that interprets omitted
and zero values as 1 (the expected behaviour for most numeric
parameters). And there is a generic cast, for use with the enum
parameter types, which interprets omitted values as 0 (the expected
behaviour for most selective parameters).
The advantage of `VTParameters` class is that it has an `at` method that
can never fail - out of range values simply return the a default
`VTParameter` instance (this is standard behaviour in VT terminals). It
also has a `size` method that will always return a minimum count of 1,
since an empty parameter list is typically the equivalent of a single
"default" parameter, so this guarantees you'll get at least one value
when iterating over the list with `size()`.
For cases where we just need to call the same dispatch method for every
parameter, there is a helper `for_each` method, which repeatedly calls a
given predicate function with each value in the sequence. It also
collates the returned success values to determine the overall result of
the sequence. As with the `size` method, this will always make at least
one call, so it correctly handles empty sequences.
With those two classes in place, we could get rid of all the parameter
validation and default handling code in the `OutputStateMachineEngine`.
We now just use the `VTParameters::at` method to grab a parameter and
typically pass it straight to the appropriate dispatch method, letting
the cast operators automatically handle the assignment of default
values. Occasionally we might need a `value_or` call to specify a
non-standard default value, but those cases are fairly rare.
In some case the `OutputStateMachineEngine` was also checking whether
parameters values were in range, but for the most part this shouldn't
have been necessary, since that is something the dispatch classes would
already have been doing themselves (in the few cases that they weren't,
I've now updated them to do so).
I've also updated the `InputStateMachineEngine` in a similar way to the
`OutputStateMachineEngine`, getting rid of a few of the parameter
extraction methods, and simplifying other parts of the implementation.
It's not as clean a replacement as the output engine, but there are
still benefits in using the new classes.
## Validation Steps Performed
For the most part I haven't had to alter existing tests other than
accounting for changes to the API. There were a couple of tests I needed
to drop because they were checking for failure cases which shouldn't
have been failing (unexpected parameters should never be an error), or
testing output engine validation that is no longer handled at that
level.
I've added a few new tests to cover operations that take sequences of
selective parameters (`ED`, `EL`, `TBC`, `SM`, and `RM`). And I've
extended the cursor movement tests to make sure those operations can
handle extraneous parameters that weren't expected. I've also added a
test to verify that the state machine will correctly ignore parameters
beyond the maximum 32 parameter count limit.
I've also manual confirmed that the various test cases given in issues
#2101 are now working as expected.
Closes#2101
* Correct the behaviour of parsing `rgb:R/G/B`. It should be interpreted
as `RR/GG/BB` instead of `0R/0G/0B`
* Add support for `rgb:RRR/GGG/BBB` and `rgb:RRRR/GGGG/BBBB`. The
behaviour of 12 bit variants is to repeat the first digit at the end,
e.g. `rgb:123/456/789` becomes `rgb:1231/4564/7897`.
* Add support for `#` formats. We are following the rules of
[XParseColor] by interpreting `#RGB` as `R000G000B000`.
* Add support for XOrg app color names, which are supported by xterm, VTE
and many other terminal emulators.
* Multi-parameter OSC 4 is now supported.
* The chaining of OSC 10-12 is not yet supported. But the parameter
validation is relaxed by parsing the parameters as multi-params but
only use the first one, which means `\e]10;rgb:R/G/B;` and
`\e]10:rgb:R/G/B;invalid` will execute `OSC 10` with the first color
correctly. This fixes some of the issues mentioned in #942 but not
all of them.
[XParseColor]: https://linux.die.net/man/3/xparsecolorCloses#3715
This PR is about the behavior of DECSCUSR. This PR changes the meaning
of DECSCUSR 0 to restore the cursor style back to user default. This
differs from what VT spec says but it’s used in popular terminal
emulators like iTerm2 and VTE-based ones. See #1604.
Another change is that for parameter greater than 6, DECSCUSR should be
ignored, instead of restoring the cursor to legacy. This PR fixes it.
See #7382.
Fixes#1604.
<!-- Enter a brief description/summary of your PR here. What does it fix/what does it change/how was it tested (even manually, if necessary)? -->
## Summary of the Pull Request
Conhost can now support OSC8 sequences (as specified [here](https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda)). Terminal also supports those sequences and additionally hyperlinks can be opened by Ctrl+LeftClicking on them.
<!-- Other than the issue solved, is this relevant to any other issues/existing PRs? -->
## References
#204
<!-- Please review the items on the PR checklist before submitting-->
## PR Checklist
* [X] Closes#204
* [ ] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/Terminal) and sign the CLA
* [ ] Tests added/passed
* [ ] Documentation updated. If checked, please file a pull request on [our docs repo](https://github.com/MicrosoftDocs/terminal) and link it here: #xxx
* [ ] Schema updated.
* [ ] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx
<!-- Provide a more detailed description of the PR, other things fixed or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments
Added support to:
- parse OSC8 sequences and extract URIs from them (conhost and terminal)
- add hyperlink uri data to textbuffer/screeninformation, associated with a hyperlink id (conhost and terminal)
- attach hyperlink ids to text to allow for uri extraction from the textbuffer/screeninformation (conhost and terminal)
- process ctrl+leftclick to open a hyperlink in the clicked region if present
<!-- Describe how you validated the behavior. Add automated tests wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed
Open up a PowerShell tab and type
```PowerShell
${ESC}=[char]27
Write-Host "${ESC}]8;;https://github.com/microsoft/terminal${ESC}\This is a link!${ESC}]8;;${ESC}\"
```
Ctrl+LeftClick on the link correctly brings you to the terminal page on github
This PR changes the way VT control sequences are identified and
dispatched, to be more efficient and easier to extend. Instead of
parsing the intermediate characters into a vector, and then having to
identify a sequence using both that vector and the final char, we now
use just a single `uint64_t` value as the identifier.
The way the identifier is constructed is by taking the private parameter
prefix, each of the intermediate characters, and then the final
character, and shifting them into a 64-bit integer one byte at a time,
in reverse order. For example, the `DECTLTC` control has a private
parameter prefix of `?`, one intermediate of `'`, and a final character
of `s`. The ASCII values of those characters are `0x3F`, `0x27`, and
`0x73` respectively, and reversing them gets you 0x73273F, so that would
then be the identifier for the control.
The reason for storing them in reverse order, is because sometimes we
need to look at the first intermediate to determine the operation, and
treat the rest of the sequence as a kind of sub-identifier (the
character set designation sequences are one example of this). When in
reverse order, this can easily be achieved by masking off the low byte
to get the first intermediate, and then shifting the value right by 8
bits to get a new identifier with the rest of the sequence.
With 64 bits we have enough space for a private prefix, six
intermediates, and the final char, which is way more than we should ever
need (the _DEC STD 070_ specification recommends supporting at least
three intermediates, but in practice we're unlikely to see more than
two).
With this new way of identifying controls, it should now be possible for
every action code to be unique (for the most part). So I've also used
this PR to clean up the action codes a bit, splitting the codes for the
escape sequences from the control sequences, and sorting them into
alphabetical order (which also does a reasonable job of clustering
associated controls).
## Validation Steps Performed
I think the existing unit tests should be good enough to confirm that
all sequences are still being dispatched correctly. However, I've also
manually tested a number of sequences to make sure they were still
working as expected, in particular those that used intermediates, since
they were the most affected by the dispatch code refactoring.
Since these changes also affected the input state machine, I've done
some manual testing of the conpty keyboard handling (both with and
without the new Win32 input mode enabled) to make sure the keyboard VT
sequences were processed correctly. I've also manually tested the
various VT mouse modes in Vttest to confirm that they were still working
correctly too.
Closes#7276
We were using std::basic_string_view as a stand-in for std::span so that
we could change over all at once when C++20 dropped with full span
support. That day's not here yet, but as of 54a7fce3e we're using GSL 3,
whose span is C++20-compliant.
This commit replaces every instance of basic_string_view that was not
referring to an actual string with a span of the appropriate type.
I moved the `const` qualifier into span's `T` because while
`basic_string_view.at()` returns `const T&`, `span.at()` returns `T&`
(without the const). I wanted to maintain the invariant that members of
the span were immutable.
* Mechanical Changes
* `sv.at(x)` -> `gsl::at(sp, x)`
* `sv.c{begin,end}` -> `sp.{begin,end}` (span's iterators are const)
I had to replace a `std::basic_string<>` with a `std::vector<>` in
ConImeInfo, and I chose to replace a manual array walk in
ScreenInfoUiaProviderBase with a ranged-for. Please review those
specifically.
This will almost certainly cause a code size regression in Windows
because I'm blowing out all the PGO counts. Whoops.
Related: #3956, #975.
This PR adds support for the `DA2` (Secondary Device Attributes) and
`DA3` (Tertiary Device Attributes) escape sequences, which are standard
VT queries reporting basic information about the terminal.
The _Secondary Device Attributes_ response is made up of a number of
parameters:
1. An identification code, for which I've used 0 to indicate that we
have the capabilities of a VT100 (using code 0 for this is an XTerm
convention, since technically DA2 would not have been supported by a
VT100).
2. A firmware revision level, which some terminal emulators use to
report their actual version number, but I thought it best we just
hardcode a value of 10 (the DEC convention for 1.0).
3. Additional hardware options, which tend to be device specific, but
I've followed the convention of the later DEC terminals using 1 to
indicate the presence of a PC keyboard.
The _Tertiary Device Attributes_ response was originally used to provide
a unique terminal identification code, and which some terminal emulators
use as a way to identify themselves. However, I think that's information
we'd probably prefer not to reveal, so I've followed the more common
practice of returning all zeros for the ID.
In terms of implementation, the only complication was the need to add an
additional code path in the `OutputStateMachine` to handle the `>` and
`=` intermediates (technically private parameter prefixes) that these
sequences require. I've done this as a single method - rather than one
for each prefix - since I think that makes the code easier to follow.
VALIDATION
----------
I've added output engine tests to make sure the sequences are dispatched
correctly, and adapter tests to confirm that they are returning the
responses we expect. I've also manually confirmed that they pass the
_Test of terminal reports_ in Vttest.
Closes#5836
With this commit, terminal will be able to copy text to the system
clipboard by using OSC 52 MANIPULATE SELECTION DAATA.
We chose not to implement the clipboard querying functionality offered
by OSC 52, as sending the clipboard text to an application without the
user's knowledge or consent is an immense security hole.
We do not currently support the clipboard specifier Pc to specify which
clipboard buffer should be filled
# Base64 encoded `foo`
$ echo -en "\e]52;;Zm9v\a"
# Multiple lines
# Base64 encoded `foo\r\nbar`
$ echo -en "\e]52;;Zm9vDQpiYXI=\a"
Closes#2946.
## Summary of the Pull Request
Caches vectors in the class and uses a new helper to opportunistically shrink/grow as viewport sizes change in order to save performance on alloc/free of commonly used vectors.
## PR Checklist
* [x] Scratches a perf itch.
* [x] I work here.
* [x] wil tests added
* [x] No add'l doc.
* [x] Am core contributor.
## Detailed Description of the Pull Request / Additional comments
Two fixes:
1. For outputting lots of text, the base renderer class spent a lot of time allocating and freeing and reallocating the `Cluster` vector that adapts the text buffer information into render clusters. I've now cached this vector in the base render class itself and I shrink/grow it based on the viewport update that happens at the top of every frame. To prevent too much thrashing in the downward/shrink direction, I wrote the `til::manage_vector` helper that contains a threshold to only shrink if it asks for small enough of a size relative to the existing one. I used 80% of the existing size as the threshold for this one.
2. For outputting lots of changing colors, the VT graphics output engine spent a bunch of time allocating and reallocating the vector for `GraphicsOptions`. This one doesn't really have a predictable size, but I never expect it to get extremely big. So I just held it in the base class.
## Validation Steps Performed
* [x] Ran the til unit test
* [x] Checked render cluster vector time before/after against `big.txt` from #1064
* [x] Checked VT graphics output vector time before/after against `cacafire`
Case | Before | After
---|---|---|
`big.txt` |  | 
`cacafire` |  | 
Adds support for `win32-input-mode` to conhost, conpty, and the Windows
Terminal.
* The shared `terminalInput` class supports sending these sequences when
a VT client application requests this mode.
* ConPTY supports synthesizing `INPUT_RECORD`s from the input sent to it
from a terminal
* ConPTY requests this mode immediately on startup (if started with a
new flag, `PSEUDOCONSOLE_WIN32_INPUT_MODE`)
* The Terminal now supports sending this input as well, when conpty asks
for it.
Also adds a new ConPTY flag `PSEUDOCONSOLE_WIN32_INPUT_MODE` which
requests this functionality from conpty, and the Terminal requests this
by default.
Also adds `experimental.input.forceVT` as a global setting to let a user
opt-out of this behavior, if they don't want it / this ends up breaking
horribly.
## Validation Steps Performed
* played with this mode in vtpipeterm
* played with this mode in Terminal
* checked a bunch of scenarios, as outlined in a [comment] on #4999
[comment]: https://github.com/microsoft/terminal/issues/4999#issuecomment-628718631
References #4999: The megathread
References #5887: The spec
Closes#879Closes#2865Closes#530Closes#3079Closes#1119Closes#1694Closes#3608Closes#4334Closes#4446
This PR improves our VT character set support, enabling the [`SCS`]
escape sequences to designate into all four G-sets with both 94- and
96-character sets, and supports invoking those G-sets into both the GL
and GR areas of the code table, with [locking shifts] and [single
shifts]. It also adds [`DOCS`] sequences to switch between UTF-8 and the
ISO-2022 coding system (which is what the VT character sets require),
and adds support for a lot more characters sets, up to around the level
of a VT510.
[`SCS`]: https://vt100.net/docs/vt510-rm/SCS.html
[locking shifts]: https://vt100.net/docs/vt510-rm/LS.html
[single shifts]: https://vt100.net/docs/vt510-rm/SS.html
[`DOCS`]: https://en.wikipedia.org/wiki/ISO/IEC_2022#Interaction_with_other_coding_systems
## Detailed Description of the Pull Request / Additional comments
To make it easier for us to declare a bunch of character sets, I've made
a little `constexpr` class that can build up a mapping table from a base
character set (ASCII or Latin1), along with a collection of mappings for
the characters the deviate from the base set. Many of the character sets
are simple variations of ASCII, so they're easy to define this way.
This class then casts directly to a `wstring_view` which is how the
translation tables are represented in most of the code. We have an array
of four of these tables representing the four G-sets, two instances for
the active left and right tables, and one instance for the single shift
table.
Initially we had just one `DesignateCharset` method, which could select
the active character set. We now have two designate methods (for 94- and
96- character sets), and each takes a G-set number specifying the target
of the designation, and a pair of characters identifying the character
set that will be designated (at the higher VT levels, character sets are
often identified by more than one character).
There are then two new `LockingShift` methods to invoke these G-sets
into either the GL or GR area of the code table, and a `SingleShift`
method which invokes a G-set temporarily (for just the next character
that is output).
I should mention here that I had to make some changes to the state
machine to make these single shift sequences work. The problem is that
the input state machine treats `SS3` as the start of a control sequence,
while the output state machine needs it to be dispatched immediately
(it's literally the _Single Shift 3_ escape sequence). To make that
work, I've added a `ParseControlSequenceAfterSs3` callback in the
`IStateMachineEngine` interface to decide which behavior is appropriate.
When it comes to mapping a character, it's simply an array reference
into the appropriate `wstring_view` table. If the single shift table is
set, that takes preference. Otherwise the GL table is used for
characters in the range 0x20 to 0x7F, and the GR table for characters
0xA0 to 0xFF (technically some character sets will only map up to 0x7E
and 0xFE, but that's easily controlled by the length of the
`wstring_view`).
The `DEL` character is a bit of a special case. By default it's meant to
be ignored like the `NUL` character (it's essentially a time-fill
character). However, it's possible that it could be remapped to a
printable character in a 96-character set, so we need to check for that
after the translation. This is handled in the `AdaptDispatch::Print`
method, so it doesn't interfere with the primary `PrintString` code
path.
The biggest problem with this whole process, though, is that the GR
mappings only really make sense if you have access to the raw output,
but by the time the output gets to us, it would already have been
translated to Unicode by the active code page. And in the case of UTF-8,
the characters we eventually receive may originally have been composed
from two or more code points.
The way I've dealt with this was to disable the GR translations by
default, and then added support for a pair of ISO-2022 `DOCS` sequences,
which can switch the code page between UTF-8 and ISO-8859-1. When the
code page is ISO-8859-1, we're essentially receiving the raw output
bytes, so it's safe to enable the GR translations. This is not strictly
correct ISO-2022 behavior, and there are edge cases where it's not going
to work, but it's the best solution I could come up with.
## Validation Steps Performed
As a result of the `SS3` changes in the state machine engine, I've had
to move the existing `SS3` tests from the `OutputEngineTest` to the
`InputEngineTest`, otherwise they would now fail (technically they
should never have been output tests).
I've added no additional unit tests, but I have done a lot of manual
testing, and made sure we passed all the character set tests in Vttest
(at least for the character sets we currently support). Note that this
required a slightly hacked version of the app, since by default it
doesn't expose a lot of the test to low-level terminals, and we
currently identify as a VT100.
Closes#3377Closes#3487
## Summary of the Pull Request
This PR adds support for the core VT52 commands, and implements the `DECANM` private mode sequence, which switches the terminal between ANSI mode and VT52-compatible mode.
## References
PR #2017 defined the initial specification for VT52 support.
PR #4044 removed the original VT52 cursor ops that conflicted with VT100 sequences.
## PR Checklist
* [x] Closes#976
* [x] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/Terminal) and sign the CLA
* [x] Tests added/passed
* [ ] Requires documentation to be updated
* [x] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #2017
## Detailed Description of the Pull Request / Additional comments
Most of the work involves updates to the parsing state machine, which behaves differently in VT52 mode. `CSI`, `OSC`, and `SS3` sequences are not applicable, and there is one special-case escape sequence (_Direct Cursor Address_), which requires an additional state to handle parameters that come _after_ the final character.
Once the parsing is handled though, it's mostly just a matter of dispatching the commands to existing methods in the `ITermDispatch` interface. Only one new method was required in the interface to handle the _Identify_ command.
The only real new functionality is in the `TerminalInput` class, which needs to generate different escape sequences for certain keys in VT52 mode. This does not yet support _all_ of the VT52 key sequences, because the VT100 support is itself not yet complete. But the basics are in place, and I think the rest is best left for a follow-up issue, and potentially a refactor of the `TerminalInput` class.
I should point out that the original spec called for a new _Graphic Mode_ character set, but I've since discovered that the VT terminals that _emulate_ VT52 just use the existing VT100 _Special Graphics_ set, so that is really what we should be doing too. We can always consider adding the VT52 graphic set as a option later, if there is demand for strict VT52 compatibility.
## Validation Steps Performed
I've added state machine and adapter tests to confirm that the `DECANM` mode changing sequences are correctly dispatched and forwarded to the `ConGetSet` handler. I've also added state machine tests that confirm the VT52 escape sequences are dispatched correctly when the ANSI mode is reset.
For fuzzing support, I've extended the VT command fuzzer to generate the different kinds of VT52 sequences, as well as mode change sequences to switch between the ANSI and VT52 modes.
In terms of manual testing, I've confirmed that the _Test of VT52 mode_ in Vttest now works as expected.
Generated by https://github.com/jsoref/spelling `f`; to maintain your repo, please consider `fchurn`
I generally try to ignore upstream bits. I've accidentally included some items from the `deps/` directory. I expect someone will give me a list of items to drop, I'm happy to drop whole files/directories, or to split the PR into multiple items (E.g. comments/locals/public).
Closes#4294
## Summary of the Pull Request
This PR adds support for the `HPR` and `VPR` escape sequences from the VT510 terminal. `HPR` moves the cursor position forward by a given number of columns, and `VPR` moves the cursor position downward by a given number of rows. They're similar in function to the `CUF` and `CUD` escape sequences, except that they're not constrained by the scrolling margins.
## References
#3628 provided the new `_CursorMovePosition` method that made these operations possible
## PR Checklist
* [x] Closes#3428
* [x] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/Terminal) and sign the CLA
* [x] Tests added/passed
* [ ] Requires documentation to be updated
* [ ] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx
## Detailed Description of the Pull Request / Additional comments
Most of the implementation is in the new `_CursorMovePosition` method that was created in PR #3628, so all we're really doing here is hooking up the escape sequences to call that method with the appropriate parameters.
## Validation Steps Performed
I've extended the existing state machine tests for CSI cursor movement to confirm that the `HPR` and `VPR` sequences are dispatched correctly, and also added screen buffer tests to make sure the movement is clamped by the screen boundaries and not the scrolling margins (we don't yet support horizontal margins, but the test is at least in place for when we do eventually add that support).
I've also checked the `HPR` and `VPR` tests in Vttest (under _Test non-VT100 / ISO-6429 cursor-movement_) and confirmed that they are now working as expected.
## Summary of the Pull Request
This adds support for the `FF` (form feed) and `VT` (vertical tab) [control characters](https://vt100.net/docs/vt510-rm/chapter4.html#T4-1), as well as the [`NEL` (Next Line)](https://vt100.net/docs/vt510-rm/NEL.html) and [`IND` (Index)](https://vt100.net/docs/vt510-rm/IND.html) escape sequences.
## References
#976 discusses the conflict between VT100 Index sequence and the VT52 cursor back sequence.
## PR Checklist
* [x] Closes#3189
* [x] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/Terminal) and sign the CLA
* [x] Tests added/passed
* [ ] Requires documentation to be updated
* [x] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #3189
## Detailed Description of the Pull Request / Additional comments
I've added a `LineFeed` method to the `ITermDispatch` interface, with an enum parameter specifying the required line feed type (i.e. with carriage return, without carriage return, or dependent on the [`LNM` mode](https://vt100.net/docs/vt510-rm/LNM.html)). The output state machine can then call that method to handle the various line feed control characters (parsed in the `ActionExecute` method), as well the `NEL` and `IND` escape sequences (parsed in the `ActionEscDispatch` method).
The `AdaptDispatch` implementation of `LineFeed` then forwards the call to a new `PrivateLineFeed` method in the `ConGetSet` interface, which simply takes a bool parameter specifying whether a carriage return is required or not. In the case of mode-dependent line feeds, the `AdaptDispatch` implementation determines whether the return is necessary or not, based on the existing _AutoReturnOnNewLine_ setting (which I'm obtaining via another new `PrivateGetLineFeedMode` method).
Ultimately we'll want to support changing the mode via the [`LNM` escape sequence](https://vt100.net/docs/vt510-rm/LNM.html), but there's no urgent need for that now. And using the existing _AutoReturnOnNewLine_ setting as a substitute for the mode gives us backwards compatible behaviour, since that will be true for the Windows shells (which expect a linefeed to also generate a carriage return), and false in a WSL bash shell (which won't want the carriage return by default).
As for the actual `PrivateLineFeed` implementation, that is just a simplified version of how the line feed would previously have been executed in the `WriteCharsLegacy` function. This includes setting the cursor to "On" (with `Cursor::SetIsOn`), potentially clearing the wrap property of the line being left (with `CharRow::SetWrapForced` false), and then setting the new position using `AdjustCursorPosition` with the _fKeepCursorVisible_ parameter set to false.
I'm unsure whether the `SetIsOn` call is really necessary, and I think the way the forced wrap is handled needs a rethink in general, but for now this should at least be compatible with the existing behaviour.
Finally, in order to make this all work in the _Windows Terminal_ app, I also had to add a basic implementation of the `ITermDispatch::LineFeed` method in the `TerminalDispatch` class. There is currently no need to support mode-specific line feeds here, so this simply forwards a `\n` or `\r\n` to the `Execute` method, which is ultimately handled by the `Terminal::_WriteBuffer` implementation.
## Validation Steps Performed
I've added output engine tests which confirm that the various control characters and escape sequences trigger the dispatch method correctly. Then I've added adapter tests which confirm the various dispatch options trigger the `PrivateLineFeed` API correctly. And finally I added some screen buffer tests that check the actual results of the `NEL` and `IND` sequences, which covers both forms of the `PrivateLineFeed` API (i.e. with and without a carriage return).
I've also run the _Test of cursor movements_ in the [Vttest](https://invisible-island.net/vttest/) utility, and confirmed that screens 1, 2, and 5 are now working correctly. The first two depend on `NEL` and `IND` being supported, and screen 5 requires the `VT` control character.
<!-- Enter a brief description/summary of your PR here. What does it fix/what does it change/how was it tested (even manually, if necessary)? -->
## Summary of the Pull Request
- Enables auditing of Virtual Terminal libraries (input, adapter, parser)
<!-- Please review the items on the PR checklist before submitting-->
## PR Checklist
* [x] Rolls audit out to more things
* [x] I work here
* [x] Tests should still pass
* [x] Am core contributor
* [x] Closes#3957
<!-- Provide a more detailed description of the PR, other things fixed or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments
This is turning on the auditing of these projects (as enabled by the heavier lifting in the other refactor) and then cleaning up the remaining warnings.
<!-- Describe how you validated the behavior. Add automated tests wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed
- [x] Built it
- [x] Ran the tests
## Summary of the Pull Request
Refactors parsing/adapting libraries and consumers to use safer and/or more consistent mechanisms for passing information.
## PR Checklist
* [x] I work here
* [x] Tests still pass
* [x] Am a core contributor.
## Detailed Description of the Pull Request / Additional comments
This is in support of hopefully turning audit mode on to more projects. If I turned it on, it would immediately complain about certain classes of issues like pointer and size, pointer math, etc. The changes in this refactoring will eliminate those off the top.
Additionally, this has caught a bunch of comments all over the VT classes that weren't updated to match the parameters lists.
Additionally, this has caught a handful of member variables on classes that were completely unused (and now gone).
Additionally, I'm killing almost all hungarian and shortening variable names. I'm only really leaving 'p' for pointers.
Additionally, this is vaguely in support of a future where we can have "infinite scrollback" in that I'm moving things to size_t across the board. I know it's a bit of a memory cost, but all the casting and moving between types is error prone and unfun to save a couple bytes.
## Validation Steps Performed
- [x] build it
- [x] run all the tests
- [x] everyone looked real hard at it
## Summary of the Pull Request
This adds support for the [`DECALN`](https://vt100.net/docs/vt510-rm/DECALN.html) escape sequence, which produces a kind of test pattern, originally used on VT terminals to adjust the screen alignment. It's needed to pass several of the tests in the [Vttest](https://invisible-island.net/vttest/) suite.
## PR Checklist
* [x] Closes#3671
* [x] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/Terminal) and sign the CLA
* [x] Tests added/passed
* [ ] Requires documentation to be updated
* [ ] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx
## Detailed Description of the Pull Request / Additional comments
To start with, the `ActionEscDispatch` method in the `OutputStateMachineEngine` needed to be extended to check for a new intermediate type (`#`). Then when that intermediate is followed by an `8`, it dispatches to a new `ScreenAlignmentPattern` method in the `ITermDispatch` interface.
The implementation of the `ScreenAlignmentPattern` itself is fairly simple. It uses the recently added `PrivateFillRegion` API to fill the screen with the character `E` using default attributes. Then in addition to that, a bunch of VT properties are reset:
* The meta/extended attributes are reset (although the active colors must be left unchanged).
* The origin mode is set to absolute positioning.
* The scrolling margins are cleared.
* The cursor position is moved to home.
## Validation Steps Performed
I've added a screen buffer test that makes sure the `DECALN` sequence fills the screen with the correct character and attributes, and that the above mentioned properties are all updated appropriately.
I've also tested in Vttest, and confirmed that the first two pages of the _Test of cursor movements_ are now showing the frame of E's that are expected there.
* Add support for the HPA escape sequence as an alias for CHA.
* Extend the output engine tests for cursor movement to confirm that HPA is dispatched in the same way as CHA.
The OutputStateMachine needs to collect "Intermediate" characters to be able to call [`Designate G0 Character Set`](https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h2-Controls-beginning-with-ESC) (as well as other sequences we don't yet support).
However, the InputStateMachine used by conpty to process input should _not_ collect these characters. The input engine uses `\x1b` as an indicator that a key was pressed with `Alt`. For keys like `/`, we want to dispatch the key immediately, instead of collecting it and leaving us in the Escape state.
* Support OSC to set default background and foreground colors
* Update the Terminal theme when the background changes
* Fix whitespace per code-review
* Add Documentation Comments
Also fix a few outdated comments and whitespace
* Update Telemetry codes per code review
* Add Unit Tests for OSC ForegroundColor and BackgroundColor
* Add a couple additional test cases
* Minor doc and whitespace change per PR review
* Update comment help per code review
* Add another OSC 10 & 11 test case, improve output
* Comments and syntax cleanup per code reviews
