--- /dev/null
+import type {CodeKeywordDefinition, ErrorObject, KeywordErrorDefinition} from "../../types"
+import type {KeywordCxt} from "../../compile/validate"
+import {usePattern} from "../code"
+import {_, str} from "../../compile/codegen"
+
+export type PatternError = ErrorObject<"pattern", {pattern: string}, string | {$data: string}>
+
+const error: KeywordErrorDefinition = {
+ message: ({schemaCode}) => str`must match pattern "${schemaCode}"`,
+ params: ({schemaCode}) => _`{pattern: ${schemaCode}}`,
+}
+
+const def: CodeKeywordDefinition = {
+ keyword: "pattern",
+ type: "string",
+ schemaType: "string",
+ $data: true,
+ error,
+ code(cxt: KeywordCxt) {
+ const {gen, data, $data, schema, schemaCode} = cxt
+ const regExp = $data ? _`(new RegExp(${schemaCode}, "u"))` : usePattern(gen, schema) // TODO regexp should be wrapped in try/catch
+ cxt.fail$data(_`!${regExp}.test(${data})`)
+ },
+}
+
+export default def