comparison DEPENDENCIES/generic/include/boost/uuid/string_generator.hpp @ 16:2665513ce2d3

Add boost headers

+// Boost string_generator.hpp header file  ----------------------------------------------//
+
+// Copyright 2010 Andy Tompkins.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UUID_STRING_GENERATOR_HPP
+#define BOOST_UUID_STRING_GENERATOR_HPP
+
+#include <boost/uuid/uuid.hpp>
+#include <string>
+#include <cstring> // for strlen, wcslen
+#include <iterator>
+#include <algorithm> // for find
+#include <stdexcept>
+#include <boost/throw_exception.hpp>
+
+#ifdef BOOST_NO_STDC_NAMESPACE
+namespace std {
+    using ::strlen;
+    using ::wcslen;
+} //namespace std
+#endif //BOOST_NO_STDC_NAMESPACE
+
+namespace boost {
+namespace uuids {
+
+// generate a uuid from a string
+// lexical_cast works fine using uuid_io.hpp
+// but this generator should accept more forms
+// and be more efficient
+// would like to accept the following forms:
+// 0123456789abcdef0123456789abcdef
+// 01234567-89ab-cdef-0123456789abcdef
+// {01234567-89ab-cdef-0123456789abcdef}
+// {0123456789abcdef0123456789abcdef}
+// others?
+struct string_generator {
+    typedef uuid result_type;
+    
+    template <typename ch, typename char_traits, typename alloc>
+    uuid operator()(std::basic_string<ch, char_traits, alloc> const& s) const {
+        return operator()(s.begin(), s.end());
+    }
+
+    uuid operator()(char const*const s) const {
+        return operator()(s, s+std::strlen(s));
+    }
+
+    uuid operator()(wchar_t const*const s) const {
+        return operator()(s, s+std::wcslen(s));
+    }
+
+    template <typename CharIterator>
+    uuid operator()(CharIterator begin, CharIterator end) const
+    {
+        typedef typename std::iterator_traits<CharIterator>::value_type char_type;
+
+        // check open brace
+        char_type c = get_next_char(begin, end);
+        bool has_open_brace = is_open_brace(c);
+        char_type open_brace_char = c;
+        if (has_open_brace) {
+            c = get_next_char(begin, end);
+        }
+
+        bool has_dashes = false;
+
+        uuid u;
+        int i=0;
+        for (uuid::iterator it_byte=u.begin(); it_byte!=u.end(); ++it_byte, ++i) {
+            if (it_byte != u.begin()) {
+                c = get_next_char(begin, end);
+            }
+            
+            if (i == 4) {
+                has_dashes = is_dash(c);
+                if (has_dashes) {
+                    c = get_next_char(begin, end);
+                }
+            }
+            
+            if (has_dashes) {
+                if (i == 6 || i == 8 || i == 10) {
+                    if (is_dash(c)) {
+                        c = get_next_char(begin, end);
+                    } else {
+                        throw_invalid();
+                    }
+                }
+            }
+
+            *it_byte = get_value(c);
+
+            c = get_next_char(begin, end);
+            *it_byte <<= 4;
+            *it_byte |= get_value(c);
+        }
+
+        // check close brace
+        if (has_open_brace) {
+            c = get_next_char(begin, end);
+            check_close_brace(c, open_brace_char);
+        }
+        
+        return u;
+    }
+    
+private:
+    template <typename CharIterator>
+    typename std::iterator_traits<CharIterator>::value_type
+    get_next_char(CharIterator& begin, CharIterator end) const {
+        if (begin == end) {
+            throw_invalid();
+        }
+        return *begin++;
+    }
+
+    unsigned char get_value(char c) const {
+        static char const*const digits_begin = "0123456789abcdefABCDEF";
+        static char const*const digits_end = digits_begin + 22;
+
+        static unsigned char const values[] =
+            { 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,10,11,12,13,14,15
+            , static_cast<unsigned char>(-1) };
+
+        char const* d = std::find(digits_begin, digits_end, c);
+        return values[d - digits_begin];
+    }
+
+    unsigned char get_value(wchar_t c) const {
+        static wchar_t const*const digits_begin = L"0123456789abcdefABCDEF";
+        static wchar_t const*const digits_end = digits_begin + 22;
+        
+        static unsigned char const values[] =
+            { 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,10,11,12,13,14,15
+            , static_cast<unsigned char>(-1) };
+
+        wchar_t const* d = std::find(digits_begin, digits_end, c);
+        return values[d - digits_begin];
+    }
+
+    bool is_dash(char c) const {
+        return c == '-';
+    }
+    
+    bool is_dash(wchar_t c) const {
+        return c == L'-';
+    }
+    
+    // return closing brace
+    bool is_open_brace(char c) const {
+        return (c == '{');
+    }
+    
+    bool is_open_brace(wchar_t c) const {
+        return (c == L'{');
+    }
+    
+    void check_close_brace(char c, char open_brace) const {
+        if (open_brace == '{' && c == '}') {
+            //great
+        } else {
+            throw_invalid();
+        }
+    }
+    
+    void check_close_brace(wchar_t c, wchar_t open_brace) const {
+        if (open_brace == L'{' && c == L'}') {
+            // great
+        } else {
+            throw_invalid();
+        }
+    }
+    
+    void throw_invalid() const {
+        BOOST_THROW_EXCEPTION(std::runtime_error("invalid uuid string"));
+    }
+};
+
+}} // namespace boost::uuids
+
+#endif //BOOST_UUID_STRING_GENERATOR_HPP
+