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device/cppcodec/parse_error.hpp

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+/**
+ *  Copyright (C) 2015 Topology LP
+ *  All rights reserved.
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to
+ *  deal in the Software without restriction, including without limitation the
+ *  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ *  sell copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in
+ *  all copies or substantial portions of the Software.
+ *
+ *  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 AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ *  IN THE SOFTWARE.
+ */
+
+#ifndef CPPCODEC_PARSE_ERROR
+#define CPPCODEC_PARSE_ERROR
+
+#include <stdexcept>
+#include <string>
+
+namespace cppcodec {
+
+namespace detail {
+// <*stream> headers include a lot of code and noticeably increase compile times.
+// The only thing we want from them really is a char-to-string conversion.
+// That's easy to implement with many less lines of code, so let's do it ourselves.
+template <int N>
+static void uctoa(unsigned char n, char (&s)[N])
+{
+    static_assert(N >= 4, "need at least 4 bytes to convert an unsigned char to string safely");
+    int i = sizeof(s) - 1;
+    int num_chars = 1;
+    s[i--] = '\0';
+    do { // generate digits in reverse order
+        s[i--] = n % 10 + '0'; // get next digit
+        ++num_chars;
+    } while ((n /= 10) > 0); // delete it
+
+    if (num_chars == sizeof(s)) {
+        return;
+    }
+    for (i = 0; i < num_chars; ++i) { // move chars to front of string
+        s[i] = s[i + (sizeof(s) - num_chars)];
+    }
+}
+} // end namespace detail
+
+
+class parse_error : public std::domain_error
+{
+public:
+    using std::domain_error::domain_error;
+};
+
+// Avoids memory allocation, so it can be used in constexpr functions.
+class symbol_error : public parse_error
+{
+public:
+    symbol_error(char c)
+        : parse_error(symbol_error::make_error_message(c))
+        , m_symbol(c)
+    {
+    }
+
+    symbol_error(const symbol_error&) = default;
+
+    char symbol() const noexcept { return m_symbol; }
+
+private:
+    static std::string make_error_message(char c)
+    {
+        char s[4];
+        detail::uctoa(*reinterpret_cast<unsigned char*>(&c), s);
+        return std::string("parse error: character [") + &(s[0]) + " '" + c + "'] out of bounds";
+    }
+
+private:
+    char m_symbol;
+};
+
+class invalid_input_length : public parse_error
+{
+public:
+    using parse_error::parse_error;
+};
+
+class padding_error : public invalid_input_length
+{
+public:
+    padding_error()
+        : invalid_input_length("parse error: codec expects padded input string but padding was invalid")
+    {
+    }
+
+    padding_error(const padding_error&) = default;
+};
+
+} // namespace cppcodec
+
+#endif // CPPCODEC_PARSE_ERROR