add antlr

lib/antlr4/include/support/StringUtils.h

@@ -0,0 +1,54 @@
+/* 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.
+ */
+
+#pragma once
+
+#include "antlr4-common.h"
+
+namespace antlrcpp {
+
+  // For all conversions utf8 <-> utf32.
+  // VS 2015 and VS 2017 have different bugs in std::codecvt_utf8<char32_t> (VS 2013 works fine).
+#if defined(_MSC_VER) && _MSC_VER >= 1900 && _MSC_VER < 2000
+  typedef std::wstring_convert<std::codecvt_utf8<__int32>, __int32> UTF32Converter;
+#else
+  typedef std::wstring_convert<std::codecvt_utf8<char32_t>, char32_t> UTF32Converter;
+#endif
+  
+  // The conversion functions fails in VS2017, so we explicitly use a workaround.
+  template<typename T>
+  inline std::string utf32_to_utf8(T const& data)
+  {
+    // Don't make the converter static or we have to serialize access to it.
+    thread_local UTF32Converter converter;
+
+    #if defined(_MSC_VER) && _MSC_VER >= 1900 && _MSC_VER < 2000
+      auto p = reinterpret_cast<const int32_t *>(data.data());
+      return converter.to_bytes(p, p + data.size());
+    #else
+      return converter.to_bytes(data);
+    #endif
+  }
+
+  inline UTF32String utf8_to_utf32(const char* first, const char* last)
+  {
+    thread_local UTF32Converter converter;
+
+    #if defined(_MSC_VER) && _MSC_VER >= 1900 && _MSC_VER < 2000
+      auto r = converter.from_bytes(first, last);
+      i32string s = reinterpret_cast<const int32_t *>(r.data());
+    #else
+      std::u32string s = converter.from_bytes(first, last);
+    #endif
+    
+    return s;
+  }
+
+  void replaceAll(std::string &str, std::string const& from, std::string const& to);
+
+  // string <-> wstring conversion (UTF-16), e.g. for use with Window's wide APIs.
+  ANTLR4CPP_PUBLIC std::string ws2s(std::wstring const& wstr);
+  ANTLR4CPP_PUBLIC std::wstring s2ws(std::string const& str);
+}