Implementation:TobikoData Sqlmesh Editor Context

Knowledge Sources	TobikoData_Sqlmesh
Domains	Web_UI, Code_Editor, State_Management
Last Updated	2026-02-07 20:00 GMT

Overview

State management store for the SQLMesh code editor, managing open tabs, SQL dialects, query previews, and editor layouts.

Description

The Editor_Context module implements a Zustand store for the SQL editor functionality in the SQLMesh web UI. It manages editor tabs (open files), SQL dialects (engine-specific syntax), query previews (rendered SQL and results), diff views (comparing changes), and editor layouts (vertical/horizontal splits). The store integrates with Web Workers for SQL validation and provides tab persistence across browser sessions using localStorage.

Usage

Use this context to manage the state of the SQL editor component, including opening/closing files, switching between tabs, previewing query results, and managing dialect-specific SQL syntax highlighting.

Code Reference

Source Location

Repository: TobikoData_Sqlmesh
File: web/client/src/context/editor.ts

Signature

interface EditorStore {
  storedTabId?: ID
  storedTabs: StoredTab[]
  tabs: Map<ModelFile, EditorTab>
  tab?: EditorTab
  engine: Worker
  dialects: Dialect[]
  previewQuery?: string
  previewTable?: [TableColumn[], TableRow[]]
  previewDiff?: any
  direction: 'vertical' | 'horizontal'

  setDirection: (direction: 'vertical' | 'horizontal') => void
  selectTab: (tab?: EditorTab) => void
  replaceTab: (from: EditorTab, to: EditorTab) => void
  updateStoredTabsIds: () => void
  inTabs: (file: ModelFile) => boolean
  addTab: (tab: EditorTab) => void
  addTabs: (tabs: EditorTab[]) => void
  closeTab: (file: ModelFile) => void
  createTab: (file?: ModelFile) => EditorTab
  setDialects: (dialects: Dialect[]) => void
  refreshTab: (tab?: EditorTab) => void
  setPreviewQuery: (previewQuery?: string) => void
  setPreviewTable: (previewTable?: [TableColumn[], TableRow[]]) => void
  setPreviewDiff: (previewDiff?: any) => void
}

export interface EditorTab {
  id: string
  file: ModelFile
  isValid: boolean
  dialect?: string
  dialectOptions?: {
    keywords: string
    types: string
  }
  preview?: EditorPreview
  el?: HTMLElement
}

export const useStoreEditor = create<EditorStore>()

Import

import { useStoreEditor } from '~/context/editor'

I/O Contract

Key State Properties

Name	Type	Description
tabs	Map<ModelFile, EditorTab>	All open editor tabs indexed by file
tab	EditorTab	Currently active/selected tab
dialects	Dialect[]	Available SQL dialects (engines)
previewQuery	string	Rendered SQL query for preview
previewTable	[TableColumn[], TableRow[]]	Query execution results
previewDiff	any	Model changes comparison view
direction	'vertical' or 'horizontal'	Editor split pane orientation
engine	Worker	Web Worker for SQL validation (sqlglot)

Key Methods

Name	Parameters	Description
addTab	EditorTab	Open a new file in a tab (inserts after current tab)
closeTab	ModelFile	Close tab and clean up file changes
selectTab	EditorTab	Switch to a different tab
replaceTab	from, to	Replace tab (e.g., when saving untitled file)
setDialects	Dialect[]	Update available SQL dialects
setPreviewQuery	string	Set rendered SQL for preview
setPreviewTable	[columns, rows]	Set query execution results
setDirection	'vertical' or 'horizontal'	Change editor layout orientation

Implementation Details

Tab Management

Tab ordering: New tabs inserted after current tab position
Tab closure: Automatically selects previous tab when closing
Single tab behavior: Unselects tab when last tab is closed
File association: Each tab is backed by a ModelFile instance

Tab Persistence

Tabs are persisted to localStorage with the following rules:

Local unchanged files: Not persisted (default scratch pad)
Remote files: Always persisted
Changed files: Persisted with content for recovery
Active tab: Tab ID stored to restore on reload

SQL Dialect Support

Dialect metadata: Keywords and types for syntax highlighting
Validation: Real-time SQL validation via Web Worker
Engine integration: Supports 16+ SQL engines through sqlglot

Preview System

Three types of previews:

Query preview: Rendered SQL with substituted variables
Table preview: Query execution results as data grid
Diff preview: Model changes comparison

Usage Examples

import { useStoreEditor, createLocalFile } from '~/context/editor'

function Editor() {
  const {
    tabs,
    tab,
    addTab,
    closeTab,
    selectTab,
    setPreviewQuery,
    direction,
    setDirection
  } = useStoreEditor()

  // Create and open new tab
  const newFile = createLocalFile()
  const newTab = createTab(newFile)
  addTab(newTab)

  // Switch to tab
  selectTab(newTab)

  // Close tab
  closeTab(newFile)

  // Set query preview
  setPreviewQuery('SELECT * FROM my_model')

  // Toggle layout
  setDirection(direction === 'vertical' ? 'horizontal' : 'vertical')

  return <div>Active: {tab?.file.name}</div>
}

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