mirror of
https://github.com/enso-org/enso.git
synced 2024-11-26 08:52:58 +03:00
b97fc39214
close #6232 Changelog: - remove: `SqlVersionsRepo` - update: `SuggestionsDatabaseModuleUpdateNotification` message removing the version - update: cleanup versions repo usages in the language server
266 lines
12 KiB
Markdown
266 lines
12 KiB
Markdown
---
|
|
layout: developer-doc
|
|
title: Searcher
|
|
category: runtime
|
|
tags: [runtime, search, execution]
|
|
order: 8
|
|
---
|
|
|
|
# Searcher
|
|
|
|
The language auto-completion feature requires an ability to search the codebase
|
|
using different search criteria. This document describes the Searcher module,
|
|
which consists of the suggestions database and the ranking algorithm for
|
|
ordering the results.
|
|
|
|
<!-- MarkdownTOC levels="2,3" autolink="true" -->
|
|
|
|
- [Suggestions Database](#suggestions-database)
|
|
- [Static Analysis](#static-analysis)
|
|
- [Runtime Inspection](#runtime-inspection)
|
|
- [Search Indexes](#search-indexes)
|
|
- [Results Ranking](#results-ranking)
|
|
- [Implementation](#implementation)
|
|
|
|
<!-- /MarkdownTOC -->
|
|
|
|
## Suggestions Database
|
|
|
|
Suggestions database holds entries for fulfilling the auto-completion requests
|
|
with additional indexes used to answer the different search criteria. The
|
|
database is populated partially by analyzing the sources and enriched with the
|
|
extra information from the runtime.
|
|
|
|
API data types for the suggestions database are specified in the
|
|
[Language Server Message Specification](../language-server/protocol-language-server.md)
|
|
document.
|
|
|
|
### Database Structure
|
|
|
|
Implementation utilizes the SQLite database.
|
|
|
|
Database is created per project and the database file stored in the project
|
|
directory. That way the index can be preserved between the IDE restarts.
|
|
|
|
#### Suggestions Table
|
|
|
|
Suggestions table stores suggestion entries.
|
|
|
|
| Column | Type | Description |
|
|
| -------------------- | --------- | ------------------------------------------------------------------- |
|
|
| `id` | `INTEGER` | the unique identifier |
|
|
| `externalId` | `UUID` | the external id from the IR |
|
|
| `kind` | `INTEGER` | the type of suggestion entry, i.e. Atom, Method, Function, or Local |
|
|
| `module` | `TEXT` | the module name |
|
|
| `name` | `TEXT` | the suggestion name |
|
|
| `self_type` | `TEXT` | the self type of the Method |
|
|
| `return_type` | `TEXT` | the return type of the entry |
|
|
| `scope_start` | `INTEGER` | the start position of the definition scope |
|
|
| `scope_end` | `INTEGER` | the end position of the definition scope |
|
|
| `documentation` | `TEXT` | the documentation string |
|
|
| `documentation_html` | `TEXT` | the documentation string rendered as HTML |
|
|
|
|
#### Arguments Table
|
|
|
|
Arguments table stores all suggestion arguments with `suggestion_id` foreign
|
|
key.
|
|
|
|
| Column | Type | Description |
|
|
| --------------- | --------- | --------------------------------------------------------------- |
|
|
| `id` | `INTEGER` | the unique identifier |
|
|
| `suggestion_id` | `INTEGER` | the suggestion key this argument relates to |
|
|
| `index` | `INTEGER` | the argument position in the arguments list |
|
|
| `name` | `TEXT` | the argument name |
|
|
| `type` | `TEXT` | the argument type; const 'Any' is used to specify generic types |
|
|
| `is_suspended` | `INTEGER` | indicates whether the argument is lazy |
|
|
| `has_defult` | `INTEGER` | indicates whether the argument has default value |
|
|
| `default_value` | `TEXT` | the optional default value |
|
|
|
|
#### Suggestions Version Table
|
|
|
|
Versions table has a single row with the current database version. The version
|
|
is updated on every change in the suggestions table.
|
|
|
|
| Column | Type | Description |
|
|
| ------ | --------- | --------------------------------------------------------------- |
|
|
| `id` | `INTEGER` | the unique identifier representing the currend database version |
|
|
|
|
#### Schema Version Table
|
|
|
|
Schema version table has a single row with the current database schema version.
|
|
It is used during the application startup to check that the database schema is
|
|
up to date with the application version.
|
|
|
|
| Column | Type | Description |
|
|
| ------ | --------- | ------------------------------------------------------------------ |
|
|
| `id` | `INTEGER` | unique identifier representing the currend database schema version |
|
|
|
|
#### Suggestions Order Table
|
|
|
|
Suggestions order table stores the order of the module-level entries in the
|
|
source file. `suggestion_id` column is a foreign key that refers to the `id`
|
|
primary key in the Suggestions table.
|
|
|
|
| Column | Type | Description |
|
|
| --------------- | --------- | ---------------------------------------- |
|
|
| `suggestion_id` | `INTEGER` | the unique identifier of a suggestion |
|
|
| `prev_id` | `INTEGER` | the suggestion that goes before this one |
|
|
| `next_id` | `INTEGER` | the suggestion that goes after this one |
|
|
|
|
### Static Analysis
|
|
|
|
The database is filled by analyzing the Intermediate Representation (`IR`)
|
|
parsed from the source.
|
|
|
|
Language constructs for suggestions database extracted from the `IR`:
|
|
|
|
- Atoms
|
|
- Methods
|
|
- Functions
|
|
- Local assignments
|
|
- Documentation
|
|
|
|
In addition, it holds the locality information for each entry. Locality
|
|
information specifies the scope where the node was defined, which is used in the
|
|
results [ranking](#results-ranking) algorithm.
|
|
|
|
### Runtime Inspection
|
|
|
|
The `IR` is missing information about the types. Runtime instrumentation is used
|
|
to capture the types and refine the database entries.
|
|
|
|
Information for suggestions database gathered in runtime:
|
|
|
|
- Types
|
|
|
|
### Search Indexes
|
|
|
|
The database allows searching the entries by the following criteria, applying
|
|
the [ranking](#results-ranking) algorithm:
|
|
|
|
- name
|
|
- type
|
|
- documentation text
|
|
- documentation tags
|
|
|
|
## Results Ranking
|
|
|
|
The search result has an intrinsic ranking based on the scope and the type.
|
|
|
|
### Scope
|
|
|
|
The results from the local scope have the highest rank in the search result. As
|
|
the scope becomes wider, the rank decreases.
|
|
|
|
```ruby
|
|
const_x = 42
|
|
|
|
main =
|
|
x1 = 0
|
|
foo x =
|
|
x2 = x + 1
|
|
calculate #
|
|
```
|
|
|
|
For example, when completing the argument of `calculate: Number -> Number`
|
|
function, the search results will have the order of: `x2` > `x1` > `const_x`.
|
|
|
|
### Type
|
|
|
|
Suggestions based on the type are selected by matching with the string runtime
|
|
type representation.
|
|
|
|
## Implementation
|
|
|
|
The searcher primarily consists of:
|
|
|
|
- Suggestions database that stores suggestion entries and SHA hashes of the
|
|
opened file contents.
|
|
- Search requests handler that serves search and capability requests, and
|
|
listens to the notifications from the runtime.
|
|
- Suggestion builder (aka _indexer_) that extracts suggestion entries from `IR`
|
|
in compile time.
|
|
|
|
```
|
|
|
|
+--------------------------------+
|
|
| SuggestionsDB |
|
|
+-----------------+--------------+
|
|
| SuggestionsRepo |
|
|
+----+------------+---------+----+
|
|
^ ^
|
|
| |
|
|
Capability,Search v v
|
|
+--------+ Request +---------+----------+ +--+------------------+
|
|
| Client +<---------------->+ SuggestionsHandler | | CollaborativeBuffer |
|
|
+--------+ Database Update +---------+----------+ +-------------------+-+
|
|
Notifications ^ OpenFileNotification |
|
|
| (isIndexed) |
|
|
| v
|
|
+---------+---------------------------------------+-------+
|
|
| RuntimeConnector |
|
|
+----+----------+---------------------------------+-------+
|
|
^ ^ |
|
|
ExpressionValuesComputed | | SuggestionsDBUpdate |
|
|
| | |
|
|
+------------------+--+ +--+----------------+ |
|
|
| ExecutionInstrument | | EnsureCompiledJob | +----+------+
|
|
+---------------------+ +-------------------+ | Module |
|
|
| | (re)index +-----------+
|
|
| SuggestionBuilder +-----------+ isIndexed |
|
|
| | +-----------+
|
|
+-------------------+
|
|
|
|
```
|
|
|
|
### Indexing
|
|
|
|
Indexing is a process of extracting suggestions information from the `IR`. To
|
|
keep the index in the consistent state, the language server tracks SHA versions
|
|
of all opened files in the suggestions database.
|
|
|
|
- When the user opens a file, we compare its SHA hash with the saved digest. If
|
|
they don't match, we mark the file for re-index by setting the corresponding
|
|
flag in the OpenFile notification sent to the runtime. On receive, the runtime
|
|
marks the module as not indexed.
|
|
- When the file is compiled, we check the indexed flag on the module. If the
|
|
module has not been indexed yet, we send all suggestions extracted from the IR
|
|
as a ReIndexed update to the language server. If the module has been indexed,
|
|
we only send suggestions that have been affected by the recent edits as a
|
|
Database update.
|
|
- When the language server receives ReIndexed update, it removes all suggestions
|
|
related to this module, applies newly received updates, and sends a combined
|
|
update of removed and added entries to the subscribed users. When the language
|
|
server receives a regular Database update, it applies the update on the
|
|
database and sends the appropriate updates to the subscribers.
|
|
- When the user deletes a file, we remove all entries with the corresponding
|
|
module from the database and update the users.
|
|
|
|
### Suggestion Builder
|
|
|
|
The suggestion builder takes part in the indexing process. It extracts
|
|
suggestions from the compiled `IR`. It also converts `IR` locations represented
|
|
as an absolute char indexes (from the beginning of the file) to a position
|
|
relative to a line used in the rest of the project.
|
|
|
|
### Runtime Instrumentation
|
|
|
|
Apart from the type ascriptions, we can only get the return types of expressions
|
|
in runtime. On the module execution, the language server listens to the
|
|
`ExpressionValuesComputed` notifications sent from the runtime, which contain
|
|
the external id and the actual return type. Then the language server uses
|
|
external id as a key to update return types in the database.
|
|
|
|
### Search Requests
|
|
|
|
The search request handler has direct access to the database. The completion
|
|
request is more complicated then others. To query the database, it needs to
|
|
convert the requested file path to the module name. To do this, on startup, the
|
|
language server loads the package definition from the root directory and obtains
|
|
the project name. Then, having the project name and the root directory path, it
|
|
can recover the module name from the requested file path.
|
|
|
|
The project name can be changed with the refactoring `renameProject` command. To
|
|
cover this case, the request handler listens to the `ProjectNameChanged` event
|
|
and updates the project name accordingly.
|