completion on breakpoint remove all items

[APerricone]

Type: Bug/Feature request

when create an expression for a breakpoint looks like it does not handle correctly the world split. I can explain it only by images, on my code If I try to complete a word it gives a lot of result: But if the same word is after a logical operator the result are much less:

VS Code version: Code 1.71.0 (784b0177c56c607789f9638da7b6bf3230d47a8c, 2022-09-01T07:36:10.600Z) OS version: Windows_NT x64 10.0.19044 Modes: Sandboxed: No

System Info

|Item|Value| |---|---| |CPUs|AMD Ryzen 5 2500U with Radeon Vega Mobile Gfx (8 x 1996)| |GPU Status|2d_canvas: enabled
canvas_oop_rasterization: disabled_off
direct_rendering_display_compositor: disabled_off_ok
gpu_compositing: enabled
multiple_raster_threads: enabled_on
opengl: enabled_on
rasterization: enabled
raw_draw: disabled_off_ok
skia_renderer: enabled_on
video_decode: enabled
video_encode: enabled
vulkan: disabled_off
webgl: enabled
webgl2: enabled
webgpu: disabled_off| |Load (avg)|undefined| |Memory (System)|6.90GB (0.98GB free)| |Process Argv|--crash-reporter-id 16bc8c7e-027f-4165-8229-92f97b9f44b4| |Screen Reader|no| |VM|67%|

Extensions (23)

Extension|Author (truncated)|Version ---|---|--- harbour|ape|1.0.4 regexper-unofficial|ape|0.0.3 doxdocgen|csc|1.4.0 typescript-notebook|don|2.0.6 vscode-npm-script|eg2|0.3.28 better-cpp-syntax|jef|1.15.19 vscode-language-pack-it|MS-|1.71.9070919 csharp|ms-|1.25.0 python|ms-|2022.14.0 vscode-pylance|ms-|2022.9.10 jupyter|ms-|2022.8.1002431955 jupyter-keymap|ms-|1.0.0 jupyter-renderers|ms-|1.0.9 remote-containers|ms-|0.251.0 remote-ssh|ms-|0.84.0 cmake-tools|ms-|1.12.26 cpptools|ms-|1.12.4 cpptools-extension-pack|ms-|1.3.0 hexeditor|ms-|1.9.8 notepadplusplus-keybindings|ms-|1.0.7 vscode-yaml|red|1.10.1 LiveServer|rit|5.7.9 cmake|twx|0.0.17 (2 theme extensions excluded)

A/B Experiments

``` vsliv368:30146709 vsreu685:30147344 python383cf:30185419 vspor879:30202332 vspor708:30202333 vspor363:30204092 vswsl492cf:30256860 vslsvsres303:30308271 pythonvspyl392:30443607 vserr242:30382549 pythontb:30283811 vsjup518:30340749 pythonptprofiler:30281270 vshan820:30294714 vstes263:30335439 pythondataviewer:30285071 vscod805cf:30301675 binariesv615:30325510 bridge0708:30335490 bridge0723:30353136 cmake_vspar411:30557514 vsaa593cf:30376535 pythonvs932:30410667 cppdebug:30492333 vscaat:30438848 pylanb8912:30545647 vsclangdc:30486549 c4g48928:30535728 hb751961:30553087 dsvsc012cf:30540253 azure-dev_surveyone:30548225 i497e931:30553904 ```

oard because it was too large to send. Please paste.

[APerricone]

I saw it working on https://github.com/microsoft/vscode-languageserver-node/issues/1072

[roblourens]

Sorry @dbaeumer I don't really know how this works, this editor just calls provideSuggestionItems from the beginning of the line, is there some other parsing that I am supposed to do on my end?

https://github.com/9at8/vscode/blob/64e7e2ba5baf3899572e8070b85db34200312f69/src/vs/workbench/contrib/debug/browser/breakpointWidget.ts#L251

[dbaeumer]

@roblourens in LSP completions work the same way as normal API. So I am wondering how breakpoint completion works in a scenario where the completion provider is registered on the VS Code API directly (without any LSP). Do we have an example? Then I could explain what needs to be done in an LSP world.

[roblourens]

I don't think there's a difference between the two, for this code. @isidorn do you happen to know what might be missing here?

[isidorn]

@roblourens no, sorry. I think that the trick we are doing here is to "pretend" like the user is typing in the editor below, and not in the BreakpointWidget itself to get all the intelli-sense goodness.

[roblourens]

I think that with this approach, we basically get variables that are in the scope of the main editor, then they are filtered by the text in the breakpoint widget editor. But the text in the breakpoint widget editor is never taken into account when getting completions. If I type foo.b it doesn't know that I am typing in the context of foo. so can't return foo.bar. I'm guessing this is how it's always worked but the only related issue I can find is https://github.com/microsoft/vscode/issues/61357, I'm surprised there aren't more.

I think we would need something like a fake textmodel which has the code in the breakpoint widget editor inserted into that spot in the editor model, so that completions are requested with full context. I'm not really sure that's practical.

[isidorn]

I confirm this is how it always worked. And I believe your interpretation is spot on.

[roblourens]

@dbaeumer does LSP itself offer anything for this scenario? The scenario basically being, give me completions for this position in this document, BUT with this extra code context (the code I am typing in the breakpoint widget).

It would be nice for this to work fully but I would have to consult with another expert since the other options I can think of seem like bad hacks

1. Create a new text model which is a copy of the real editor's model plus the input from the breakpoint widget
2. Insert the breakpoint widget text into the real document, request completions, then delete it

[dbaeumer]

@roblourens LSP has no support for this scenario. IMO if we want to provide this we need some API in VS Code as well.

[connor4312]

Related: https://github.com/microsoft/vscode/issues/48810