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[ES|QL] Comment parsing and pretty-printing #192173

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merged 56 commits into from
Sep 26, 2024

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vadimkibana
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@vadimkibana vadimkibana commented Sep 5, 2024

Summary

Partially addresses #182257

TL;DR

  • Adds ability to parse out comments from source to AST.
  • Adds ability for every AST node to have decoration—comments, which can be attached from left, top, and right from the node.
  • Implements routine which attached comments to AST nodes.
  • In BasicPrettyPrinter adds support only for left and right comment printing, as the basic printer prints only on one line.
  • In WrappingPrettyPrinter adds support for all comment printing for all AST nodes.
  • Introduces a Query object and query AST node, which represent thole query—the root node, list of commands.
  • The ES|QL AST example plugin now displays the pretty-printed text version.

Comments

This PR introduced an optional formatting field for all AST nodes. In the formatting field one can specify comment decorations from different sides of a node.

When parsing, once can now specify the { withComments: true } option, which will collect all comments from the source while parsing using the collectDecorations routine. It will then also call the attachDecorations, which walks the AST and assigns each comment to some AST node.

Further, traversal and pretty-print API have been updated to work with comments:

  • The Walker has been updated to be able to walk all comments from the AST.
  • The BasicPrettyPrinter adds support only for left and right inline comment printing, as the basic printer prints only on one line.
  • The WrappingPrettyPrinter adds support for all comment printing for all AST nodes. It switches to line-break printing mode if it detects there are comments with line breaks (those could be multi-line comments, or single line comments—single line comments are always followed by a line break). It also correctly inserts punctuation, when an AST node is surrounded by comments.

Parsing utils

All parsing utils have been moved to the /parser sub-folder.

Files in the /parser folder have been renamed as per Kibana convention to reflect what is inside the file. For example, the EsqlErrorListener class is in a file named esql_error_listener.ts.

A Query class and ESQLAstQueryExpression AST nodes have been introduced. They represent the result of a full query parse. (Before that, the AST root was just an array of command nodes, now the AST root is represented by the ESQLAstQueryExpression node.)

Builder

I have started the implementation of the Builder static class in the /builder folder. It is simply a collection of stateless AST node factories—functions which construct AST nodes.

Some of the Builder methods are already used by the parser, more will follow. We will also use the Builder in upcoming Mutation API.

ES|QL Example Plugin

This PR sets up Storybook and implements few Storybook stories for the ES|QL AST example plugin, run it with:

yarn storybook esql_ast_inspector

This PR updates the ES|QL AST Explorer example plugin. Start Kibana with example plugins enabled:

yarn start --run-examples

And navigate to /app/esql_ast_inspector to see the new example plugin UI.

esql-ast-explorer

Checklist

For maintainers

@vadimkibana vadimkibana changed the title comment parsing and pretty-printing [ES|QL] Comment parsing and pretty-printing Sep 5, 2024
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@elasticmachine merge upstream

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@stratoula stratoula left a comment

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This looks very very nice Vadim. One question:

here
meow

when using the pretty printing the comments are gone. Should we update this function too now?

const { root } = parse(src, { withFormatting: true });
const text = BasicPrettyPrinter.print(root);

// console.log(JSON.stringify(ast, null, 2));
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Is it on purpose there Vadim?

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I left it on purpose, as it is handy when writing these tests. But I can, of course, remove if it does not fit the style quide.

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Nah, just asking. I am fine with it

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vadimkibana commented Sep 25, 2024

when using the pretty printing the comments are gone. Should we update this function too now?

@stratoula That text based editor is using the basic pretty printer, let's update it but in a separate PR. Also, in your example you are pretty printing a single line comment (which always ends with a line break) to a single line. The query cannot possibly have single line comments and be formatted to a single line. Maybe worth discussing in a team sync what we want to do in this situation.

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Also, in your example you are pretty printing a single line comment (which always ends with a line break) to a single line

True I was expecting to change into a single line comment but maybe is an edge case.

About :

hat text based editor is using the basic pretty printer, let's update it but in a separate PR

Sure, lets do it on a follow up PR 👍

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I would appreciate another round of review here from @drewdaemon but for me LGTM! Amazing work as always

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💚 Build Succeeded

Metrics [docs]

Public APIs missing comments

Total count of every public API that lacks a comment. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats comments for more detailed information.

id before after diff
@kbn/esql-ast 139 208 +69

Async chunks

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id before after diff
dashboard 490.6KB 490.6KB -16.0B
dataVisualizer 726.6KB 726.5KB -64.0B
esql 178.5KB 178.4KB -47.0B
infra 1.6MB 1.6MB -16.0B
investigateApp 466.6KB 466.5KB -32.0B
lens 1.5MB 1.5MB -32.0B
maps 3.0MB 3.0MB -48.0B
observabilityAIAssistantApp 154.4KB 154.3KB -32.0B
securitySolution 20.4MB 20.4MB -80.0B
stackAlerts 75.7KB 75.7KB -32.0B
unifiedHistogram 67.3KB 67.2KB -16.0B
total -415.0B

Public APIs missing exports

Total count of every type that is part of your API that should be exported but is not. This will cause broken links in the API documentation system. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats exports for more detailed information.

id before after diff
@kbn/esql-ast 20 34 +14

Page load bundle

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id before after diff
discover 49.1KB 49.0KB -64.0B
kbnUiSharedDeps-srcJs 3.4MB 3.4MB +16.6KB
total +16.6KB
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id before after diff
@kbn/esql-ast 177 266 +89

ESLint disabled in files

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Total ESLint disabled count

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@kbn/esql-ast 3 4 +1

History

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

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Amazing work @vadimkibana ! I'm so glad that we'll now have a way to stop making autocomplete suggestions inside of comments 🤦‍♂️

I did notice a very minor quirk where the editor doesn't extend as far as I expect it to.

Screen.Recording.2024-09-25.at.3.32.44.PM.mov

@vadimkibana vadimkibana merged commit 2217337 into elastic:main Sep 26, 2024
22 checks passed
@stratoula stratoula added backport:prev-minor Backport to (8.x) the previous minor version (i.e. one version back from main) and removed backport:skip This commit does not require backporting labels Sep 26, 2024
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💚 All backports created successfully

Status Branch Result
8.x

Note: Successful backport PRs will be merged automatically after passing CI.

Questions ?

Please refer to the Backport tool documentation

kibanamachine pushed a commit to kibanamachine/kibana that referenced this pull request Sep 26, 2024
## Summary

TL;DR

- Adds ability to parse out comments from source to AST.
- Adds ability for every AST node to have *decoration*—comments,
which can be attached from left, top, and right from the node.
- Implements routine which attached comments to AST nodes.
- In `BasicPrettyPrinter` adds support only for *left* and *right*
comment printing, as the basic printer prints only on one line.
- In `WrappingPrettyPrinter` adds support for all comment printing for
all AST nodes.
- Introduces a `Query` object and `query` AST node, which represent
thole query—the root node, list of commands.
- The ES|QL AST example plugin now displays the pretty-printed text
version.

### Comments

This PR introduced an optional `formatting` field for all AST nodes. In
the `formatting` field one can specify comment decorations from
different sides of a node.

When parsing, once can now specify the `{ withComments: true }` option,
which will collect all comments from the source while parsing using the
`collectDecorations` routine. It will then also call the
`attachDecorations`, which walks the AST and assigns each comment to
some AST node.

Further, traversal and pretty-print API have been updated to work with
comments:

- The `Walker` has been updated to be able to walk all comments from the
AST.
- The `BasicPrettyPrinter` adds support only for *left* and *right*
inline comment printing, as the basic printer prints only on one line.
- The `WrappingPrettyPrinter` adds support for all comment printing for
all AST nodes. It switches to line-break printing mode if it detects
there are comments with line breaks (those could be multi-line comments,
or single line comments—single line comments are always followed
by a line break). It also correctly inserts punctuation, when an AST
node is surrounded by comments.

### Parsing utils

All parsing utils have been moved to the `/parser` sub-folder.

Files in the `/parser` folder have been renamed as per Kibana convention
to reflect what is inside the file. For example, the `EsqlErrorListener`
class is in a file named `esql_error_listener.ts`.

A `Query` class and `ESQLAstQueryExpression` AST nodes have been
introduced. They represent the result of a full query parse. (Before
that, the AST root was just an array of command nodes, now the AST root
is represented by the `ESQLAstQueryExpression` node.)

### Builder

I have started the implementation of the `Builder` static class in the
`/builder` folder. It is simply a collection of stateless AST node
factories—functions which construct AST nodes.

Some of the `Builder` methods are already used by the parser, more will
follow. We will also use the `Builder` in upcoming [*Mutation
API*](elastic#191812).

### ES|QL Example Plugin

This PR sets up Storybook and implements few Storybook stories for the
ES|QL AST example plugin, run it with:

```
yarn storybook esql_ast_inspector
```

This PR updates the *ES|QL AST Explorer* example plugin. Start Kibana
with example plugins enabled:

```
yarn start --run-examples
```

And navigate to
[`/app/esql_ast_inspector`](http://localhost:5601/app/esql_ast_inspector)
to see the new example plugin UI.

![esql-ast-explorer](https://github.com/user-attachments/assets/8ded91ea-1b60-4514-8cf5-c8a4066a3a12)

### Checklist

- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios

### For maintainers

- [x] This was checked for breaking API changes and was [labeled
appropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

---------

Co-authored-by: kibanamachine <[email protected]>
Co-authored-by: Elastic Machine <[email protected]>
Co-authored-by: Stratoula Kalafateli <[email protected]>
(cherry picked from commit 2217337)
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💚 All backports created successfully

Status Branch Result
8.x

Note: Successful backport PRs will be merged automatically after passing CI.

Questions ?

Please refer to the Backport tool documentation

kibanamachine added a commit that referenced this pull request Sep 26, 2024
# Backport

This will backport the following commits from `main` to `8.x`:
- [[ES|QL] Comment parsing and pretty-printing
(#192173)](#192173)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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kibanamachine
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Elastic Machine
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Comment parsing and
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Comment parsing and pretty-printing (#192173)\n\n##
Summary\r\n\r\nTL;DR\r\n\r\n- Adds ability to parse out comments from
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was
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Comment parsing and pretty-printing (#192173)\n\n##
Summary\r\n\r\nTL;DR\r\n\r\n- Adds ability to parse out comments from
source to AST.\r\n- Adds ability for every AST node to have
*decoration*&mdash;comments,\r\nwhich can be attached from left, top,
and right from the node.\r\n- Implements routine which attached comments
to AST nodes.\r\n- In `BasicPrettyPrinter` adds support only for *left*
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pretty-printed text\r\nversion.\r\n\r\n\r\n### Comments\r\n\r\nThis PR
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`formatting` field one can specify comment decorations from\r\ndifferent
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the source while parsing using the\r\n`collectDecorations` routine. It
will then also call the\r\n`attachDecorations`, which walks the AST and
assigns each comment to\r\nsome AST node.\r\n\r\nFurther, traversal and
pretty-print API have been updated to work with\r\ncomments:\r\n\r\n-
The `Walker` has been updated to be able to walk all comments from
the\r\nAST.\r\n- The `BasicPrettyPrinter` adds support only for *left*
and *right*\r\ninline comment printing, as the basic printer prints only
on one line.\r\n- The `WrappingPrettyPrinter` adds support for all
comment printing for\r\nall AST nodes. It switches to line-break
printing mode if it detects\r\nthere are comments with line breaks
(those could be multi-line comments,\r\nor single line
comments&mdash;single line comments are always followed\r\nby a line
break). It also correctly inserts punctuation, when an AST\r\nnode is
surrounded by comments.\r\n\r\n\r\n### Parsing utils\r\n\r\nAll parsing
utils have been moved to the `/parser` sub-folder.\r\n\r\nFiles in the
`/parser` folder have been renamed as per Kibana convention\r\nto
reflect what is inside the file. For example, the
`EsqlErrorListener`\r\nclass is in a file named
`esql_error_listener.ts`.\r\n\r\nA `Query` class and
`ESQLAstQueryExpression` AST nodes have been\r\nintroduced. They
represent the result of a full query parse. (Before\r\nthat, the AST
root was just an array of command nodes, now the AST root\r\nis
represented by the `ESQLAstQueryExpression` node.)\r\n\r\n\r\n###
Builder\r\n\r\nI have started the implementation of the `Builder` static
class in the\r\n`/builder` folder. It is simply a collection of
stateless AST node\r\nfactories&mdash;functions which construct AST
nodes.\r\n\r\nSome of the `Builder` methods are already used by the
parser, more will\r\nfollow. We will also use the `Builder` in upcoming
[*Mutation\r\nAPI*](https://github.com/elastic/kibana/issues/191812).\r\n\r\n\r\n###
ES|QL Example Plugin\r\n\r\nThis PR sets up Storybook and implements few
Storybook stories for the\r\nES|QL AST example plugin, run it
with:\r\n\r\n```\r\nyarn storybook esql_ast_inspector\r\n```\r\n\r\nThis
PR updates the *ES|QL AST Explorer* example plugin. Start Kibana\r\nwith
example plugins enabled:\r\n\r\n```\r\nyarn start
--run-examples\r\n```\r\n\r\nAnd navigate
to\r\n[`/app/esql_ast_inspector`](http://localhost:5601/app/esql_ast_inspector)\r\nto
see the new example plugin
UI.\r\n\r\n\r\n\r\n![esql-ast-explorer](https://github.com/user-attachments/assets/8ded91ea-1b60-4514-8cf5-c8a4066a3a12)\r\n\r\n\r\n###
Checklist\r\n\r\n- [x] [Unit or
functional\r\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\r\nwere
updated or added to match the most common scenarios\r\n\r\n\r\n### For
maintainers\r\n\r\n- [x] This was checked for breaking API changes and
was
[labeled\r\nappropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)\r\n\r\n---------\r\n\r\nCo-authored-by:
kibanamachine
<[email protected]>\r\nCo-authored-by:
Elastic Machine
<[email protected]>\r\nCo-authored-by: Stratoula
Kalafateli
<[email protected]>","sha":"2217337c5d91340ba67e0bedaab0762502518993"}},{"branch":"8.x","label":"v8.16.0","branchLabelMappingKey":"^v8.16.0$","isSourceBranch":false,"state":"NOT_CREATED"}]}]
BACKPORT-->

Co-authored-by: Vadim Kibana <[email protected]>
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backport:prev-minor Backport to (8.x) the previous minor version (i.e. one version back from main) Feature:ES|QL ES|QL related features in Kibana release_note:skip Skip the PR/issue when compiling release notes review Team:ESQL ES|QL related features in Kibana v8.16.0 v9.0.0
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