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diff --git a/src/lsp/util/lexers.ts b/src/lsp/util/lexers.ts
new file mode 100644
index 0000000000000000000000000000000000000000..65197b943a3ef18cb7b5ab1435c10235bca67bbe
--- /dev/null
+++ b/src/lsp/util/lexers.ts
@@ -0,0 +1,53 @@
+import moo from 'moo'
+import { lazy } from './lazy'
+
+const classAttributeStates: { [x: string]: moo.Rules } = {
+ doubleClassList: {
+ lbrace: { match: /(?<!\\)\{/, push: 'interp' },
+ rbrace: { match: /(?<!\\)\}/, pop: 1 },
+ end: { match: /(?<!\\)"/, pop: 1 },
+ classlist: { match: /[\s\S]/, lineBreaks: true },
+ },
+ singleClassList: {
+ lbrace: { match: /(?<!\\)\{/, push: 'interp' },
+ rbrace: { match: /(?<!\\)\}/, pop: 1 },
+ end: { match: /(?<!\\)'/, pop: 1 },
+ classlist: { match: /[\s\S]/, lineBreaks: true },
+ },
+ tickClassList: {
+ lbrace: { match: /(?<=(?<!\\)\$)\{/, push: 'interp' },
+ rbrace: { match: /(?<!\\)\}/, pop: 1 },
+ end: { match: /(?<!\\)`/, pop: 1 },
+ classlist: { match: /[\s\S]/, lineBreaks: true },
+ },
+ interp: {
+ startSingle: { match: /(?<!\\)'/, push: 'singleClassList' },
+ startDouble: { match: /(?<!\\)"/, push: 'doubleClassList' },
+ startTick: { match: /(?<!\\)`/, push: 'tickClassList' },
+ lbrace: { match: /(?<!\\)\{/, push: 'interp' },
+ rbrace: { match: /(?<!\\)\}/, pop: 1 },
+ text: { match: /[\s\S]/, lineBreaks: true },
+ },
+}
+
+export const getClassAttributeLexer = lazy(() =>
+ moo.states({
+ main: {
+ start1: { match: '"', push: 'doubleClassList' },
+ start2: { match: "'", push: 'singleClassList' },
+ start3: { match: '{', push: 'interp' },
+ },
+ ...classAttributeStates,
+ })
+)
+
+export const getComputedClassAttributeLexer = lazy(() =>
+ moo.states({
+ main: {
+ quote: { match: /['"{]/, push: 'interp' },
+ },
+ // TODO: really this should use a different interp definition that is
+ // terminated correctly based on the initial quote type
+ ...classAttributeStates,
+ })
+)
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