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+// file : tests/utf8/driver.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
+// license : MIT; see accompanying LICENSE file
+
+#include <cassert>
+
+#ifndef __cpp_lib_modules_ts
+#include <string>
+#endif
+
+// Other includes.
+
+#ifdef __cpp_modules_ts
+#ifdef __cpp_lib_modules_ts
+import std.core;
+#endif
+import butl.utility;
+#else
+#include <libbutl/utility.mxx>
+#endif
+
+using namespace std;
+using namespace butl;
+
+int
+main ()
+{
+ // Valid sequences.
+ //
+ // Empty.
+ //
+ assert (utf8 (""));
+
+ // 1 code point.
+ //
+ assert (utf8 ("a")); // 1 byte.
+ assert (utf8 ("\xD0\xB0")); // 2 bytes.
+ assert (utf8 ("\xE4\xBA\x8C")); // 3 bytes.
+ assert (utf8 ("\xF0\x90\x8C\x82")); // 4 bytes.
+
+ // Multiple code points.
+ //
+ assert (utf8 ("a\xD0\xB0\xE4\xBA\x8C\xF0\x90\x8C\x82"));
+
+ // Ill-formed sequences.
+ //
+ // 2-byte sequences.
+ //
+ assert (!utf8 ("\xC1\x80")); // Invalid first byte.
+ assert (!utf8 ("\xD0y")); // Invalid second byte.
+
+ // 3-byte sequences.
+ //
+ assert (!utf8 ("\xE2\x70\x80")); // Invalid second byte.
+ assert (!utf8 ("\xE2\x80\x70")); // Invalid third byte.
+
+ assert (!utf8 ("\xED\xA0\x80")); // Min UTF-16 surrogate value.
+ assert (!utf8 ("\xED\xBF\xBF")); // Max UTF-16 surrogate value.
+
+ // 4-byte sequences.
+ //
+ assert (!utf8 ("\xF5\x80\x80\x80")); // Invalid first byte.
+ assert (!utf8 ("\xF0\x80\x80\x80")); // Invalid second byte.
+ assert (!utf8 ("\xF0\x90\x70\x80")); // Invalid third byte.
+ assert (!utf8 ("\xF1\x80\x80\xC0")); // Invalid forth byte.
+
+ // Out of the codepoint range (0x10ffff + 1).
+ //
+ assert (!utf8 ("\xF4\x90\x80\x80"));
+
+ // Incomplete sequences.
+ //
+ assert (!utf8 ("\xD0")); // 2-byte sequence.
+ assert (!utf8 ("\xE4\xBA")); // 3-byte sequence.
+ assert (!utf8 ("\xF0\x90\x8C")); // 4-byte sequence.
+
+ // Missing sequence leading bytes.
+ //
+ assert (!utf8 ("\xB0xyz")); // 2-byte sequence.
+ assert (!utf8 ("\xBA\x8Cxyz")); // 3-byte sequence.
+ assert (!utf8 ("\x8Cxyz")); // 3-byte sequence.
+ assert (!utf8 ("\x90\x8C\x82xyz")); // 4-byte sequence.
+ assert (!utf8 ("\x8C\x82xyz")); // 4-byte sequence.
+ assert (!utf8 ("\x82xyz")); // 4-byte sequence.
+
+ // Whitelisting.
+ //
+ assert (utf8 ("\r\t\n"));
+
+ // Matched codepoint types.
+ //
+ // Control.
+ //
+ assert (utf8 ("\r", codepoint_types::control));
+ assert (utf8 ("\x7F", codepoint_types::control));
+
+ // Non-character.
+ //
+ assert (utf8 ("\xF4\x8F\xBF\xBF", codepoint_types::non_character));
+ assert (utf8 ("\xEF\xB7\x90", codepoint_types::non_character));
+
+ // Private-use.
+ //
+ assert (utf8 ("\xEE\x80\x80", codepoint_types::private_use));
+ assert (utf8 ("\xF3\xB0\x80\x80", codepoint_types::private_use));
+
+ // Reserved.
+ //
+ assert (utf8 ("\xF3\xA1\x80\x80", codepoint_types::reserved));
+ assert (utf8 ("\xF0\xB0\x80\x80", codepoint_types::reserved));
+ assert (utf8 ("\xF3\xA0\x82\x80", codepoint_types::reserved));
+
+ // Format.
+ //
+ assert (utf8 ("\xC2\xAD", codepoint_types::format));
+ assert (utf8 ("\xD8\x80", codepoint_types::format));
+ assert (utf8 ("\xD8\x81", codepoint_types::format));
+ assert (utf8 ("\xD8\x85", codepoint_types::format));
+ assert (utf8 ("\xF3\xA0\x81\xBF", codepoint_types::format));
+
+ // Graphic.
+ //
+ assert (utf8 ("\xC2\xAC", codepoint_types::graphic));
+ assert (utf8 ("\xC2\xAE", codepoint_types::graphic));
+ assert (utf8 ("\xD8\x86", codepoint_types::graphic));
+ assert (utf8 ("\xF3\xA0\x84\x80", codepoint_types::graphic));
+
+ // Private-use & graphic.
+ //
+ assert (utf8 ("\xEE\x80\x80\xF3\xB0\x80\x80\xC2\xAC",
+ codepoint_types::private_use | codepoint_types::graphic));
+
+ // None.
+ //
+ assert (utf8 ("\t", codepoint_types::none, U"\t")); // Whitelisted.
+
+ // Any.
+ //
+ assert (utf8 ("\t"));
+
+ // Unmatched codepoint types.
+ //
+ assert (!utf8 ("\x7F", codepoint_types::graphic, U"\t")); // Control.
+ assert (!utf8 ("\xEF\xB7\x90", codepoint_types::graphic)); // Non-char.
+ assert (!utf8 ("\xEE\x80\x80", codepoint_types::graphic)); // Private.
+ assert (!utf8 ("\xF3\xA1\x80\x80", codepoint_types::graphic)); // Reserved.
+ assert (!utf8 ("\xF3\xA0\x81\xBF", codepoint_types::graphic)); // Format.
+
+ assert (!utf8 ("\xC2\xAC", codepoint_types::format)); // Graphic.
+
+ // Private-use & Graphic.
+ //
+ assert (!utf8 ("\xEE\x80\x80\xF3\xB0\x80\x80\xC2\xAC",
+ codepoint_types::format));
+
+ assert (!utf8 ("a", codepoint_types::none)); // None.
+}