add antlr source code and ReadMeHEADmain

1 files changed, 46 insertions, 0 deletions

diff --git a/antlr4-cpp-runtime-4.9.2-source/runtime/src/support/StringUtils.cpp b/antlr4-cpp-runtime-4.9.2-source/runtime/src/support/StringUtils.cpp
new file mode 100644
index 0000000..15e7b83
--- /dev/null
+++ b/antlr4-cpp-runtime-4.9.2-source/runtime/src/support/StringUtils.cpp
@@ -0,0 +1,46 @@
+/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
+ * Use of this file is governed by the BSD 3-clause license that
+ * can be found in the LICENSE.txt file in the project root.
+ */
+
+#include "support/StringUtils.h"
+
+namespace antlrcpp {
+
+void replaceAll(std::string& str, std::string const& from, std::string const& to)
+{
+  if (from.empty())
+    return;
+
+  size_t start_pos = 0;
+  while ((start_pos = str.find(from, start_pos)) != std::string::npos) {
+    str.replace(start_pos, from.length(), to);
+    start_pos += to.length(); // In case 'to' contains 'from', like replacing 'x' with 'yx'.
+  }
+}
+
+std::string ws2s(std::wstring const& wstr) {
+#ifndef USE_UTF8_INSTEAD_OF_CODECVT
+  std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> converter;
+  std::string narrow = converter.to_bytes(wstr);
+#else
+  std::string narrow;
+  utf8::utf32to8(wstr.begin(), wstr.end(), std::back_inserter(narrow));
+#endif
+
+  return narrow;
+}
+
+std::wstring s2ws(const std::string &str) {
+#ifndef USE_UTF8_INSTEAD_OF_CODECVT
+  std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> converter;
+  std::wstring wide = converter.from_bytes(str);
+#else
+  std::wstring wide;
+  utf8::utf8to32(str.begin(), str.end(), std::back_inserter(wide));
+#endif
+
+  return wide;
+}
+
+} // namespace antrlcpp