feat(LS): references (#1775)

* companion pr to prisma/prisma-engines#4934
* test references in LT

---------

Co-authored-by: Serhii Tatarintsev <tatarintsev@prisma.io>

packages/language-server/src/__test__/__fixtures__/multi-file/references/config.prisma

@@ -0,0 +1,9 @@
+generator client {
+    provider        = "prisma-client-js"
+    previewFeatures = ["prismaSchemaFolder", "views"]
+}
+
+datasource db {
+    provider = "mongodb"
+    url      = env("DATABASE_URL")
+}

packages/language-server/src/__test__/__fixtures__/multi-file/references/enums.prisma

@@ -0,0 +1,6 @@
+/// enum doc
+enum Pet {
+    /// Cat doc
+    Cat
+    RedPanda
+}

packages/language-server/src/__test__/__fixtures__/multi-file/references/models.prisma

@@ -0,0 +1,29 @@
+model User {
+    id String @id @map("_id")
+
+    posts   Post[]
+    /// field doc
+    pet     Pet
+    address Address
+
+    indexedField String
+
+    @@index([indexedField])
+}
+
+/// Documentation
+model Post {
+    id       String    @id @map("_id")
+    authorId String
+    author   User      @relation(fields: [authorId], references: [id])
+    blah     UserTwo[]
+}
+
+model B {
+    /// field doc
+    id String @id @map("_id")
+
+    bId  String?
+    bees B[]     @relation(name: "bees")
+    B    B?      @relation(name: "bees", fields: [bId], references: [id], onDelete: NoAction, onUpdate: NoAction)
+}

packages/language-server/src/__test__/__fixtures__/multi-file/references/types.prisma

@@ -0,0 +1,12 @@
+/// Address doc
+type Address {
+    street String
+    city   String
+    /// poBox doc
+    poBox  POBox
+}
+
+/// Nested ct doc
+type POBox {
+    name String
+}

packages/language-server/src/__test__/__fixtures__/multi-file/references/views.prisma

@@ -0,0 +1,16 @@
+view UserTwo {
+    id String @id @map("_id")
+
+    postId String
+    posts  Post   @relation(fields: [postId], references: [id])
+
+    address Address
+
+    uniqueField      String
+    otherUniqueField String
+
+    @@unique(fields: [uniqueField])
+    @@unique([otherUniqueField])
+    @@unique([address.poBox.name])
+    @@map("hi")
+}

packages/language-server/src/__test__/references.test.ts

@@ -0,0 +1,283 @@
+import { describe, expect, test } from 'vitest'
+import { Position, ReferenceParams } from 'vscode-languageserver'
+import { handleReferencesRequest } from '../lib/MessageHandler'
+import { PrismaSchema } from '../lib/Schema'
+import { getMultifileHelper } from './MultifileHelper'
+
+const getReferences = async (uri: string, schema: PrismaSchema, position: Position) => {
+  const params: ReferenceParams = {
+    textDocument: { uri: uri },
+    position,
+    context: { includeDeclaration: true },
+  }
+
+  return handleReferencesRequest(schema, params)
+}
+describe('References', async () => {
+  const helper = await getMultifileHelper('references')
+
+  test('of a composite type block name', async () => {
+    const file = helper.file('types.prisma')
+
+    const references = await getReferences(
+      file.uri,
+      helper.schema,
+      file.lineContaining('type Address').characterAfter('Addr'),
+    )
+
+    expect(references).not.toBeUndefined()
+    expect(references).toMatchInlineSnapshot(`
+      [
+        {
+          "range": {
+            "end": {
+              "character": 12,
+              "line": 1,
+            },
+            "start": {
+              "character": 5,
+              "line": 1,
+            },
+          },
+          "uri": "file:///references/types.prisma",
+        },
+        {
+          "range": {
+            "end": {
+              "character": 19,
+              "line": 6,
+            },
+            "start": {
+              "character": 12,
+              "line": 6,
+            },
+          },
+          "uri": "file:///references/models.prisma",
+        },
+        {
+          "range": {
+            "end": {
+              "character": 19,
+              "line": 6,
+            },
+            "start": {
+              "character": 12,
+              "line": 6,
+            },
+          },
+          "uri": "file:///references/views.prisma",
+        },
+      ]
+    `)
+  })
+
+  test('of a composite type as a field type', async () => {
+    const file = helper.file('models.prisma')
+
+    const references = await getReferences(
+      file.uri,
+      helper.schema,
+      file.lineContaining('address Address').characterAfter('Addr'),
+    )
+
+    expect(references).not.toBeUndefined()
+    expect(references).toMatchInlineSnapshot(`
+      [
+        {
+          "range": {
+            "end": {
+              "character": 12,
+              "line": 1,
+            },
+            "start": {
+              "character": 5,
+              "line": 1,
+            },
+          },
+          "uri": "file:///references/types.prisma",
+        },
+        {
+          "range": {
+            "end": {
+              "character": 19,
+              "line": 6,
+            },
+            "start": {
+              "character": 12,
+              "line": 6,
+            },
+          },
+          "uri": "file:///references/models.prisma",
+        },
+        {
+          "range": {
+            "end": {
+              "character": 19,
+              "line": 6,
+            },
+            "start": {
+              "character": 12,
+              "line": 6,
+            },
+          },
+          "uri": "file:///references/views.prisma",
+        },
+      ]
+    `)
+  })
+
+  test('of a model block name', async () => {
+    const file = helper.file('models.prisma')
+
+    const references = await getReferences(
+      file.uri,
+      helper.schema,
+      file.lineContaining('model Post').characterAfter('Po'),
+    )
+
+    expect(references).not.toBeUndefined()
+    expect(references).toMatchInlineSnapshot(`
+      [
+        {
+          "range": {
+            "end": {
+              "character": 10,
+              "line": 14,
+            },
+            "start": {
+              "character": 6,
+              "line": 14,
+            },
+          },
+          "uri": "file:///references/models.prisma",
+        },
+        {
+          "range": {
+            "end": {
+              "character": 16,
+              "line": 3,
+            },
+            "start": {
+              "character": 12,
+              "line": 3,
+            },
+          },
+          "uri": "file:///references/models.prisma",
+        },
+        {
+          "range": {
+            "end": {
+              "character": 15,
+              "line": 4,
+            },
+            "start": {
+              "character": 11,
+              "line": 4,
+            },
+          },
+          "uri": "file:///references/views.prisma",
+        },
+      ]
+    `)
+  })
+
+  test('of a model relation as a field type', async () => {
+    const file = helper.file('models.prisma')
+
+    const references = await getReferences(
+      file.uri,
+      helper.schema,
+      file.lineContaining('author   User').characterAfter('Us'),
+    )
+
+    expect(references).not.toBeUndefined()
+    expect(references).toMatchInlineSnapshot(`
+      [
+        {
+          "range": {
+            "end": {
+              "character": 10,
+              "line": 0,
+            },
+            "start": {
+              "character": 6,
+              "line": 0,
+            },
+          },
+          "uri": "file:///references/models.prisma",
+        },
+        {
+          "range": {
+            "end": {
+              "character": 17,
+              "line": 17,
+            },
+            "start": {
+              "character": 13,
+              "line": 17,
+            },
+          },
+          "uri": "file:///references/models.prisma",
+        },
+      ]
+    `)
+  })
+
+  test('of a field from relation fields', async () => {
+    const file = helper.file('models.prisma')
+
+    const references = await getReferences(
+      file.uri,
+      helper.schema,
+      file.lineContaining('author   User').characterAfter('fields: [auth'),
+    )
+
+    expect(references).not.toBeUndefined()
+    expect(references).toMatchInlineSnapshot(`
+      [
+        {
+          "range": {
+            "end": {
+              "character": 12,
+              "line": 16,
+            },
+            "start": {
+              "character": 4,
+              "line": 16,
+            },
+          },
+          "uri": "file:///references/models.prisma",
+        },
+      ]
+    `)
+  })
+
+  test('of a field from relation fields', async () => {
+    const file = helper.file('models.prisma')
+
+    const references = await getReferences(
+      file.uri,
+      helper.schema,
+      file.lineContaining('author   User').characterAfter('references: [i'),
+    )
+
+    expect(references).not.toBeUndefined()
+    expect(references).toMatchInlineSnapshot(`
+      [
+        {
+          "range": {
+            "end": {
+              "character": 6,
+              "line": 1,
+            },
+            "start": {
+              "character": 4,
+              "line": 1,
+            },
+          },
+          "uri": "file:///references/models.prisma",
+        },
+      ]
+    `)
+  })
+})

packages/language-server/src/lib/MessageHandler.ts

@@ -17,6 +17,8 @@ import {
   DocumentSymbol,
   SymbolKind,
   LocationLink,
+  ReferenceParams,
+  Location,
 } from 'vscode-languageserver'
 import type { TextDocument } from 'vscode-languageserver-textdocument'
 
@@ -53,6 +55,7 @@ import {
 import { prismaSchemaWasmCompletions, localCompletions } from './completions'
 import { PrismaSchema, SchemaDocument } from './Schema'
 import { DiagnosticMap } from './DiagnosticMap'
+import references from './prisma-schema-wasm/references'
 
 export function handleDiagnosticsRequest(
   schema: PrismaSchema,
@@ -223,6 +226,14 @@ export function handleCompletionRequest(
   return prismaSchemaWasmCompletions(schema, params, onError) || localCompletions(schema, document, params, onError)
 }
 
+export function handleReferencesRequest(
+  schema: PrismaSchema,
+  params: ReferenceParams,
+  onError?: (errorMessage: string) => void,
+): Location[] | undefined {
+  return references(schema, params, onError)
+}
+
 export function handleRenameRequest(
   schema: PrismaSchema,
   initiatingDocument: TextDocument,