Add utf8() predicate

1 files changed, 157 insertions, 0 deletions

diff --git a/tests/utf8/driver.cxx b/tests/utf8/driver.cxx
new file mode 100644
index 0000000..06fb29f
--- /dev/null
+++ b/tests/utf8/driver.cxx
@@ -0,0 +1,157 @@
+// 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.
+}