[ion/tests] More UTF8Helper tests

ion/test/utf8_helper.cpp

@@ -145,6 +145,102 @@ QUIZ_CASE(ion_utf8_remove_code_point) {
   assert_remove_code_point_gives(buffer, c, &indexToUpdate, stoppingPosition, indexToUpdateResult, result);
 }
 
+void assert_string_copy_until_code_point_gives(char * dst, size_t dstSize, const char * src, CodePoint c, const char * result, size_t returnedResult) {
+  quiz_assert(UTF8Helper::CopyUntilCodePoint(dst, dstSize, src, c) == returnedResult);
+  quiz_assert(strcmp(dst, result) == 0);
+}
+
+QUIZ_CASE(ion_utf8_helper_copy_until_code_point) {
+  constexpr int bufferSize = 100;
+  char buffer[bufferSize];
+
+  const char * s = "1234";
+  CodePoint c = '1';
+  const char * result = "";
+  size_t returnedResult = 0;
+  assert_string_copy_until_code_point_gives(buffer, bufferSize, s, c, result, returnedResult);
+
+  s = "1234";
+  c = '3';
+  result = "12";
+  returnedResult = 2;
+  assert_string_copy_until_code_point_gives(buffer, bufferSize, s, c, result, returnedResult);
+
+  s = "1234";
+  c = '6';
+  result = s;
+  returnedResult = 4;
+  assert_string_copy_until_code_point_gives(buffer, bufferSize, s, c, result, returnedResult);
+}
+
+QUIZ_CASE(ion_utf8_helper_previous_code_point_is) {
+  const char * s = "1234";
+  quiz_assert(UTF8Helper::PreviousCodePointIs(s, s+2, '2'));
+  quiz_assert(!UTF8Helper::PreviousCodePointIs(s, s+2, '4'));
+  s = "1234∑";
+  quiz_assert(UTF8Helper::PreviousCodePointIs(s, s+strlen(s), UCodePointNArySummation));
+}
+
+QUIZ_CASE(ion_utf8_helper_code_point_is) {
+  const char * s = "34";
+  quiz_assert(UTF8Helper::CodePointIs(s, '3'));
+  quiz_assert(!UTF8Helper::CodePointIs(s, '4'));
+  s = "∑1234";
+  quiz_assert(UTF8Helper::CodePointIs(s, UCodePointNArySummation));
+}
+
+void assert_string_remove_previous_glyph_gives(const char * text, char * location, const char * result, int returnedResult, CodePoint returnedCodePoint) {
+  CodePoint c = 0;
+  quiz_assert(UTF8Helper::RemovePreviousGlyph(text, location, &c) == returnedResult);
+  quiz_assert(c == returnedCodePoint);
+  quiz_assert(strcmp(text, result) == 0);
+}
+
+QUIZ_CASE(ion_utf8_helper_remove_previous_glyph) {
+  constexpr int bufferSize = 100;
+  char buffer[bufferSize];
+  // 3é4
+  buffer[0] = '3';
+  buffer[1] = 0x65;
+  buffer[2] = 0xCC;
+  buffer[3] = 0x81;
+  buffer[4] = '4';
+  buffer[5] = 0;
+  size_t sLen = 5;
+  char * location = const_cast<char *>(buffer+sLen - 1);
+  const char * result = "34";
+  int returnedResult = sLen - 2;
+  CodePoint returnedCodePoint = 'e';
+  assert_string_remove_previous_glyph_gives(buffer, location, result, returnedResult, returnedCodePoint);
+
+  const char * s = "345";
+  sLen = strlen(s);
+  strlcpy(buffer, s, sLen+1);
+  location = const_cast<char *>(buffer+sLen);
+  result = "34";
+  returnedResult = UTF8Decoder::CharSizeOfCodePoint('5');
+  returnedCodePoint = '5';
+  assert_string_remove_previous_glyph_gives(buffer, location, result, returnedResult, returnedCodePoint);
+}
+
+QUIZ_CASE(ion_utf8_code_point_at_glyph_offset) {
+  const char * s = "abc";
+  quiz_assert(UTF8Helper::CodePointAtGlyphOffset(s, 0) == s);
+  quiz_assert(UTF8Helper::CodePointAtGlyphOffset(s, 1) == s+1);
+  quiz_assert(UTF8Helper::CodePointAtGlyphOffset(s, 2) == s+2);
+  s = "a∑∫𝐢ty";
+  quiz_assert(UTF8Helper::CodePointAtGlyphOffset(s, 4) == s + strlen(s) - 2);
+}
+
+QUIZ_CASE(ion_utf8_glyph_offset_at_code_point) {
+  const char * s = "abc";
+  quiz_assert(UTF8Helper::GlyphOffsetAtCodePoint(s, s) == 0);
+  quiz_assert(UTF8Helper::GlyphOffsetAtCodePoint(s, s+1) == 1);
+  quiz_assert(UTF8Helper::GlyphOffsetAtCodePoint(s, s+2) == 2);
+  s = "a∑∫𝐢ty";
+  quiz_assert(UTF8Helper::GlyphOffsetAtCodePoint(s, s + strlen(s) - 2) == 4);
+}
+
 void assert_string_glyph_length_is(const char * string, int maxSize, size_t result) {
   quiz_assert(UTF8Helper::StringGlyphLength(string, maxSize) == result);
 }