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diff --git a/src/lsp/providers/codeActionProvider/index.ts b/src/lsp/providers/codeActionProvider/index.ts
new file mode 100644
index 0000000000000000000000000000000000000000..19d724e27e2e2fe641eceadbea635c44cf65eccd
--- /dev/null
+++ b/src/lsp/providers/codeActionProvider/index.ts
@@ -0,0 +1,266 @@
+import {
+ CodeAction,
+ CodeActionParams,
+ CodeActionKind,
+ Range,
+ TextEdit,
+ Diagnostic,
+} from 'vscode-languageserver'
+import { State } from '../../util/state'
+import { findLast, findClassNamesInRange } from '../../util/find'
+import { isWithinRange } from '../../util/isWithinRange'
+import { getClassNameParts } from '../../util/getClassNameAtPosition'
+const dlv = require('dlv')
+import dset from 'dset'
+import { removeRangeFromString } from '../../util/removeRangeFromString'
+import detectIndent from 'detect-indent'
+import { cssObjToAst } from '../../util/cssObjToAst'
+import isObject from '../../../util/isObject'
+
+export function provideCodeActions(
+ state: State,
+ params: CodeActionParams
+): Promise<CodeAction[]> {
+ if (params.context.diagnostics.length === 0) {
+ return null
+ }
+
+ return Promise.all(
+ params.context.diagnostics
+ .map((diagnostic) => {
+ if (diagnostic.code === 'invalidApply') {
+ return provideInvalidApplyCodeAction(state, params, diagnostic)
+ }
+
+ let match = findLast(
+ / Did you mean (?:something like )?'(?<replacement>[^']+)'\?$/g,
+ diagnostic.message
+ )
+
+ if (!match) {
+ return null
+ }
+
+ return {
+ title: `Replace with '${match.groups.replacement}'`,
+ kind: CodeActionKind.QuickFix,
+ diagnostics: [diagnostic],
+ edit: {
+ changes: {
+ [params.textDocument.uri]: [
+ {
+ range: diagnostic.range,
+ newText: match.groups.replacement,
+ },
+ ],
+ },
+ },
+ }
+ })
+ .filter(Boolean)
+ )
+}
+
+function classNameToAst(
+ state: State,
+ className: string,
+ selector: string = `.${className}`,
+ important: boolean = false
+) {
+ const parts = getClassNameParts(state, className)
+ if (!parts) {
+ return null
+ }
+ const baseClassName = dlv(
+ state.classNames.classNames,
+ parts[parts.length - 1]
+ )
+ if (!baseClassName) {
+ return null
+ }
+ const info = dlv(state.classNames.classNames, parts)
+ let context = info.__context || []
+ let pseudo = info.__pseudo || []
+ const globalContexts = state.classNames.context
+ let screens = dlv(
+ state.config,
+ 'theme.screens',
+ dlv(state.config, 'screens', {})
+ )
+ if (!isObject(screens)) screens = {}
+ screens = Object.keys(screens)
+ const path = []
+
+ for (let i = 0; i < parts.length - 1; i++) {
+ let part = parts[i]
+ let common = globalContexts[part]
+ if (!common) return null
+ if (screens.includes(part)) {
+ path.push(`@screen ${part}`)
+ context = context.filter((con) => !common.includes(con))
+ }
+ }
+
+ path.push(...context)
+
+ let obj = {}
+ for (let i = 1; i <= path.length; i++) {
+ dset(obj, path.slice(0, i), {})
+ }
+ let rule = {
+ // TODO: use proper selector parser
+ [selector + pseudo.join('')]: {
+ [`@apply ${parts[parts.length - 1]}${
+ important ? ' !important' : ''
+ }`]: '',
+ },
+ }
+ if (path.length) {
+ dset(obj, path, rule)
+ } else {
+ obj = rule
+ }
+
+ return cssObjToAst(obj, state.modules.postcss)
+}
+
+async function provideInvalidApplyCodeAction(
+ state: State,
+ params: CodeActionParams,
+ diagnostic: Diagnostic
+): Promise<CodeAction> {
+ let document = state.editor.documents.get(params.textDocument.uri)
+ let documentText = document.getText()
+ const { postcss } = state.modules
+ let change: TextEdit
+
+ let documentClassNames = findClassNamesInRange(
+ document,
+ {
+ start: {
+ line: Math.max(0, diagnostic.range.start.line - 10),
+ character: 0,
+ },
+ end: { line: diagnostic.range.start.line + 10, character: 0 },
+ },
+ 'css'
+ )
+ let documentClassName = documentClassNames.find((className) =>
+ isWithinRange(diagnostic.range.start, className.range)
+ )
+ if (!documentClassName) {
+ return null
+ }
+ let totalClassNamesInClassList = documentClassName.classList.classList.split(
+ /\s+/
+ ).length
+
+ await postcss([
+ postcss.plugin('', (_options = {}) => {
+ return (root) => {
+ root.walkRules((rule) => {
+ if (change) return false
+
+ rule.walkAtRules('apply', (atRule) => {
+ let { start, end } = atRule.source
+ let range: Range = {
+ start: {
+ line: start.line - 1,
+ character: start.column - 1,
+ },
+ end: {
+ line: end.line - 1,
+ character: end.column - 1,
+ },
+ }
+
+ if (!isWithinRange(diagnostic.range.start, range)) {
+ // keep looking
+ return true
+ }
+
+ let className = document.getText(diagnostic.range)
+ let ast = classNameToAst(
+ state,
+ className,
+ rule.selector,
+ documentClassName.classList.important
+ )
+
+ if (!ast) {
+ return false
+ }
+
+ rule.after(ast.nodes)
+ let insertedRule = rule.next()
+
+ if (totalClassNamesInClassList === 1) {
+ atRule.remove()
+ }
+
+ let outputIndent: string
+ let documentIndent = detectIndent(documentText)
+
+ change = {
+ range: {
+ start: {
+ line: rule.source.start.line - 1,
+ character: rule.source.start.column - 1,
+ },
+ end: {
+ line: rule.source.end.line - 1,
+ character: rule.source.end.column,
+ },
+ },
+ newText:
+ rule.toString() +
+ (insertedRule.raws.before || '\n\n') +
+ insertedRule
+ .toString()
+ .replace(/\n\s*\n/g, '\n')
+ .replace(/(@apply [^;\n]+)$/gm, '$1;')
+ .replace(/([^\s^]){$/gm, '$1 {')
+ .replace(/^\s+/gm, (m: string) => {
+ if (typeof outputIndent === 'undefined') outputIndent = m
+ return m.replace(
+ new RegExp(outputIndent, 'g'),
+ documentIndent.indent
+ )
+ }),
+ }
+
+ return false
+ })
+ })
+ }
+ }),
+ ]).process(documentText, { from: undefined })
+
+ if (!change) {
+ return null
+ }
+
+ return {
+ title: 'Extract to new rule.',
+ kind: CodeActionKind.QuickFix,
+ diagnostics: [diagnostic],
+ edit: {
+ changes: {
+ [params.textDocument.uri]: [
+ ...(totalClassNamesInClassList > 1
+ ? [
+ {
+ range: documentClassName.classList.range,
+ newText: removeRangeFromString(
+ documentClassName.classList.classList,
+ documentClassName.relativeRange
+ ),
+ },
+ ]
+ : []),
+ change,
+ ],
+ },
+ },
+ }
+}
|