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db_include/common/unicode_norm.h

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+/*-------------------------------------------------------------------------
+ *
+ * unicode_norm.h
+ *	  Routines for normalizing Unicode strings
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2017-2021, PostgreSQL Global Development Group
+ *
+ * src/include/common/unicode_norm.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef UNICODE_NORM_H
+#define UNICODE_NORM_H
+
+#include "mb/pg_wchar.h"
+
+typedef enum
+{
+	UNICODE_NFC = 0,
+	UNICODE_NFD = 1,
+	UNICODE_NFKC = 2,
+	UNICODE_NFKD = 3,
+} UnicodeNormalizationForm;
+
+/* see UAX #15 */
+typedef enum
+{
+	UNICODE_NORM_QC_NO = 0,
+	UNICODE_NORM_QC_YES = 1,
+	UNICODE_NORM_QC_MAYBE = -1,
+} UnicodeNormalizationQC;
+
+extern pg_wchar *unicode_normalize(UnicodeNormalizationForm form, const pg_wchar *input);
+
+extern UnicodeNormalizationQC unicode_is_normalized_quickcheck(UnicodeNormalizationForm form, const pg_wchar *input);
+
+#endif							/* UNICODE_NORM_H */