Update vendored utfcpp library to commit ad27c7d5e0.

5 files changed, 142 insertions, 48 deletions

diff --git a/vendor/utfcpp/utf8.h b/vendor/utfcpp/utf8.h
index 82b13f59f..c2c85d6d0 100644
--- a/vendor/utfcpp/utf8.h
+++ b/vendor/utfcpp/utf8.h
@@ -31,4 +31,8 @@ DEALINGS IN THE SOFTWARE.
 #include "utf8/checked.h"
 #include "utf8/unchecked.h"
 
+#if __cplusplus >= 201103L // C++ 11 or later
+#include "utf8/cpp11.h"
+#endif // C++ 11 or later
+
 #endif // header guard
diff --git a/vendor/utfcpp/utf8/checked.h b/vendor/utfcpp/utf8/checked.h
index 2aef5838d..c31861e0a 100644
--- a/vendor/utfcpp/utf8/checked.h
+++ b/vendor/utfcpp/utf8/checked.h
@@ -107,7 +107,9 @@ namespace utf8
                         *out++ = *it;
                     break;
                 case internal::NOT_ENOUGH_ROOM:
-                    throw not_enough_room();
+                    out = utf8::append (replacement, out);
+                    start = end;
+                    break;
                 case internal::INVALID_LEAD:
                     out = utf8::append (replacement, out);
                     ++start;
@@ -174,23 +176,19 @@ namespace utf8
         return utf8::peek_next(it, end);
     }
 
-    /// Deprecated in versions that include "prior"
-    template <typename octet_iterator>
-    uint32_t previous(octet_iterator& it, octet_iterator pass_start)
-    {
-        octet_iterator end = it;
-        while (utf8::internal::is_trail(*(--it)))
-            if (it == pass_start)
-                throw invalid_utf8(*it); // error - no lead byte in the sequence
-        octet_iterator temp = it;
-        return utf8::next(temp, end);
-    }
-
     template <typename octet_iterator, typename distance_type>
     void advance (octet_iterator& it, distance_type n, octet_iterator end)
     {
-        for (distance_type i = 0; i < n; ++i)
-            utf8::next(it, end);
+        const distance_type zero(0);
+        if (n < zero) {
+            // backward
+            for (distance_type i = n; i < zero; ++i)
+                utf8::prior(it, end);
+        } else {
+            // forward
+            for (distance_type i = zero; i < n; ++i)
+                utf8::next(it, end);
+        }
     }
 
     template <typename octet_iterator>
@@ -324,4 +322,3 @@ namespace utf8
 
 #endif //header guard
 
-
diff --git a/vendor/utfcpp/utf8/core.h b/vendor/utfcpp/utf8/core.h
index ae0f367db..e007ca17d 100644
--- a/vendor/utfcpp/utf8/core.h
+++ b/vendor/utfcpp/utf8/core.h
@@ -49,8 +49,8 @@ namespace internal
     const uint16_t LEAD_SURROGATE_MAX  = 0xdbffu;
     const uint16_t TRAIL_SURROGATE_MIN = 0xdc00u;
     const uint16_t TRAIL_SURROGATE_MAX = 0xdfffu;
-    const uint16_t LEAD_OFFSET         = LEAD_SURROGATE_MIN - (0x10000 >> 10);
-    const uint32_t SURROGATE_OFFSET    = 0x10000u - (LEAD_SURROGATE_MIN << 10) - TRAIL_SURROGATE_MIN;
+    const uint16_t LEAD_OFFSET         = 0xd7c0u;       // LEAD_SURROGATE_MIN - (0x10000 >> 10)
+    const uint32_t SURROGATE_OFFSET    = 0xfca02400u;   // 0x10000u - (LEAD_SURROGATE_MIN << 10) - TRAIL_SURROGATE_MIN
 
     // Maximum valid value for a Unicode code point
     const uint32_t CODE_POINT_MAX      = 0x0010ffffu;
@@ -142,7 +142,7 @@ namespace internal
 
         if (!utf8::internal::is_trail(*it))
             return INCOMPLETE_SEQUENCE;
-        
+
         return UTF8_OK;
     }
 
@@ -165,7 +165,7 @@ namespace internal
     {
         if (it == end) 
             return NOT_ENOUGH_ROOM;
-        
+
         code_point = utf8::internal::mask8(*it);
 
         UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
@@ -222,7 +222,7 @@ namespace internal
     template <typename octet_iterator>
     utf_error validate_next(octet_iterator& it, octet_iterator end, uint32_t& code_point)
     {
-	if (it == end)
+        if (it == end)
             return NOT_ENOUGH_ROOM;
 
         // Save the original value of it so we can go back in case of failure
@@ -237,7 +237,7 @@ namespace internal
         // Get trail octets and calculate the code point
         utf_error err = UTF8_OK;
         switch (length) {
-            case 0: 
+            case 0:
                 return INVALID_LEAD;
             case 1:
                 err = utf8::internal::get_sequence_1(it, end, cp);
@@ -313,18 +313,7 @@ namespace internal
             ((it != end) && (utf8::internal::mask8(*it++)) == bom[1]) &&
             ((it != end) && (utf8::internal::mask8(*it))   == bom[2])
            );
-    }
-	
-    //Deprecated in release 2.3 
-    template <typename octet_iterator>
-    inline bool is_bom (octet_iterator it)
-    {
-        return (
-            (utf8::internal::mask8(*it++)) == bom[0] &&
-            (utf8::internal::mask8(*it++)) == bom[1] &&
-            (utf8::internal::mask8(*it))   == bom[2]
-           );
-    }
+    }	
 } // namespace utf8
 
 #endif // header guard
diff --git a/vendor/utfcpp/utf8/cpp11.h b/vendor/utfcpp/utf8/cpp11.h
new file mode 100644
index 000000000..d93961b04
--- /dev/null
+++ b/vendor/utfcpp/utf8/cpp11.h
@@ -0,0 +1,103 @@
+// Copyright 2018 Nemanja Trifunovic
+
+/*
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+*/
+
+
+#ifndef UTF8_FOR_CPP_a184c22c_d012_11e8_a8d5_f2801f1b9fd1
+#define UTF8_FOR_CPP_a184c22c_d012_11e8_a8d5_f2801f1b9fd1
+
+#include "checked.h"
+#include <string>
+
+namespace utf8
+{
+
+    inline void append(char32_t cp, std::string& s)
+    {
+        append(uint32_t(cp), std::back_inserter(s));
+    }
+
+    inline std::string utf16to8(const std::u16string& s)
+    {
+        std::string result;
+        utf16to8(s.begin(), s.end(), std::back_inserter(result));
+        return result;
+    }
+
+    inline std::u16string utf8to16(const std::string& s)
+    {
+        std::u16string result;
+        utf8to16(s.begin(), s.end(), std::back_inserter(result));
+        return result;
+    }
+
+    inline std::string utf32to8(const std::u32string& s)
+    {
+        std::string result;
+        utf32to8(s.begin(), s.end(), std::back_inserter(result));
+        return result;
+    }
+
+    inline std::u32string utf8to32(const std::string& s)
+    {
+        std::u32string result;
+        utf8to32(s.begin(), s.end(), std::back_inserter(result));
+        return result;
+    }
+
+    inline std::size_t find_invalid(const std::string& s)
+    {
+        std::string::const_iterator invalid = find_invalid(s.begin(), s.end());
+        return (invalid == s.end()) ? std::string::npos : (invalid - s.begin());
+    }
+
+    inline bool is_valid(const std::string& s)
+    {
+        return is_valid(s.begin(), s.end());
+    }
+
+    inline std::string replace_invalid(const std::string& s, char32_t replacement)
+    {
+        std::string result;
+        replace_invalid(s.begin(), s.end(), std::back_inserter(result), replacement);
+        return result;
+    }
+
+    inline std::string replace_invalid(const std::string& s)
+    {
+        std::string result;
+        replace_invalid(s.begin(), s.end(), std::back_inserter(result));
+        return result;
+    }
+
+    inline bool starts_with_bom(const std::string& s)
+    {
+        return starts_with_bom(s.begin(), s.end());
+    }
+ 
+} // namespace utf8
+
+#endif // header guard
+
diff --git a/vendor/utfcpp/utf8/unchecked.h b/vendor/utfcpp/utf8/unchecked.h
index cb2427166..c78419f69 100644
--- a/vendor/utfcpp/utf8/unchecked.h
+++ b/vendor/utfcpp/utf8/unchecked.h
@@ -38,7 +38,7 @@ namespace utf8
         octet_iterator append(uint32_t cp, octet_iterator result)
         {
             if (cp < 0x80)                        // one octet
-                *(result++) = static_cast<uint8_t>(cp);  
+                *(result++) = static_cast<uint8_t>(cp);
             else if (cp < 0x800) {                // two octets
                 *(result++) = static_cast<uint8_t>((cp >> 6)          | 0xc0);
                 *(result++) = static_cast<uint8_t>((cp & 0x3f)        | 0x80);
@@ -85,13 +85,13 @@ namespace utf8
                     break;
             }
             ++it;
-            return cp;        
+            return cp;
         }
 
         template <typename octet_iterator>
         uint32_t peek_next(octet_iterator it)
         {
-            return utf8::unchecked::next(it);    
+            return utf8::unchecked::next(it);
         }
 
         template <typename octet_iterator>
@@ -102,18 +102,19 @@ namespace utf8
             return utf8::unchecked::next(temp);
         }
 
-        // Deprecated in versions that include prior, but only for the sake of consistency (see utf8::previous)
-        template <typename octet_iterator>
-        inline uint32_t previous(octet_iterator& it)
-        {
-            return utf8::unchecked::prior(it);
-        }
-
         template <typename octet_iterator, typename distance_type>
         void advance (octet_iterator& it, distance_type n)
         {
-            for (distance_type i = 0; i < n; ++i)
-                utf8::unchecked::next(it);
+            const distance_type zero(0);
+            if (n < zero) {
+                // backward
+                for (distance_type i = n; i < zero; ++i)
+                    utf8::unchecked::prior(it);
+            } else {
+                // forward
+                for (distance_type i = zero; i < n; ++i)
+                    utf8::unchecked::next(it);
+            }
         }
 
         template <typename octet_iterator>
@@ -128,7 +129,7 @@ namespace utf8
 
         template <typename u16bit_iterator, typename octet_iterator>
         octet_iterator utf16to8 (u16bit_iterator start, u16bit_iterator end, octet_iterator result)
-        {       
+        {
             while (start != end) {
                 uint32_t cp = utf8::internal::mask16(*start++);
             // Take care of surrogate pairs first
@@ -138,7 +139,7 @@ namespace utf8
                 }
                 result = utf8::unchecked::append(cp, result);
             }
-            return result;         
+            return result;
         }
 
         template <typename u16bit_iterator, typename octet_iterator>