Lowercase Architecture and ErrorValues (#487)

ErrorValues -> error_code, Architecture -> architecture

src/error.cpp

@@ -0,0 +1,42 @@
+#include "simdjson/error.h"
+#include <map>
+
+namespace simdjson {
+
+const std::map<int, const std::string> error_strings = {
+    {SUCCESS, "No error"},
+    {SUCCESS_AND_HAS_MORE, "No error and buffer still has more data"},
+    {CAPACITY, "This ParsedJson can't support a document that big"},
+    {MEMALLOC, "Error allocating memory, we're most likely out of memory"},
+    {TAPE_ERROR, "Something went wrong while writing to the tape"},
+    {STRING_ERROR, "Problem while parsing a string"},
+    {T_ATOM_ERROR,
+     "Problem while parsing an atom starting with the letter 't'"},
+    {F_ATOM_ERROR,
+     "Problem while parsing an atom starting with the letter 'f'"},
+    {N_ATOM_ERROR,
+     "Problem while parsing an atom starting with the letter 'n'"},
+    {NUMBER_ERROR, "Problem while parsing a number"},
+    {UTF8_ERROR, "The input is not valid UTF-8"},
+    {UNINITIALIZED, "Uninitialized"},
+    {EMPTY, "Empty: no JSON found"},
+    {UNESCAPED_CHARS, "Within strings, some characters must be escaped, we "
+                      "found unescaped characters"},
+    {UNCLOSED_STRING, "A string is opened, but never closed."},
+    {UNEXPECTED_ERROR, "Unexpected error, consider reporting this problem as "
+                       "you may have found a bug in simdjson"},
+};
+
+// string returned when the error code is not recognized
+const std::string unexpected_error_msg {"Unexpected error"};
+
+// returns a string matching the error code
+const std::string &error_message(error_code code) {
+  auto keyvalue = error_strings.find(code);
+  if(keyvalue == error_strings.end()) {
+    return unexpected_error_msg;
+  }
+  return keyvalue->second;
+}
+
+} // namespace simdjson