Added 'split_winmain' function.

[SVN r23550]

src/winmain.cpp

@@ -0,0 +1,93 @@
+// Copyright Vladimir Prus 2002-2004.
+// 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)
+
+#define BOOST_PROGRAM_OPTIONS_SOURCE
+#include <boost/program_options/parsers.hpp>
+
+#ifdef _WIN32
+namespace boost { namespace program_options {
+
+    using namespace std;
+
+    // The rules for windows command line are pretty funny, see
+    //    http://article.gmane.org/gmane.comp.lib.boost.user/3005
+    //    http://msdn.microsoft.com/library/en-us/vccelng/htm/progs_12.asp
+    
+    BOOST_PROGRAM_OPTIONS_DECL
+    std::vector<std::string> split_winmain(const std::string& input)
+    {
+        std::vector<std::string> result;
+
+        string::const_iterator i = input.begin(), e = input.end();
+        for(;i != e; ++i)
+            if (!std::isspace(*i))
+                break;
+       
+        if (i != e) {
+   
+            std::string current;
+            bool inside_quoted = false;
+            int backslash_count = 0;
+            
+            for(; i != e; ++i) {
+                if (*i == '"') {
+                    // '"' preceded by even number (n) of backslashes generates
+                    // n/2 backslashes and is a quoted block delimiter
+                    if (backslash_count % 2 == 0) {
+                        current.append(backslash_count / 2, '\\');
+                        inside_quoted = !inside_quoted;
+                        // '"' preceded by odd number (n) of backslashes generates
+                        // (n-1)/2 backslashes and is literal quote.
+                    } else {
+                        current.append(backslash_count / 2, '\\');                
+                        current.push_back('"');                
+                    }
+                    backslash_count = 0;
+                } else if (*i == '\\') {
+                    ++backslash_count;
+                } else {
+                    // Not quote or backslash. All accumulated backslashes should be
+                    // added
+                    if (backslash_count) {
+                        current.append(backslash_count, '\\');
+                        backslash_count = 0;
+                    }
+                    if (isspace(*i) && !inside_quoted) {
+                        // Space outside quoted section terminate the current argument
+                        result.push_back(current);
+                        current.resize(0);
+                        for(;i != e && isspace(*i); ++i)
+                            ;
+                        --i;
+                    } else {                  
+                        current.push_back(*i);
+                    }
+                }
+            }
+
+            // If we have trailing backslashes, add them
+            if (backslash_count)
+                current.append(backslash_count, '\\');
+        
+            // If we have non-empty 'current' or we're still in quoted
+            // section (even if 'current' is empty), add the last token.
+            if (!current.empty() || inside_quoted)
+                result.push_back(current);        
+        }
+        return result;
+    }
+
+    BOOST_PROGRAM_OPTIONS_DECL std::vector<std::wstring>
+    split_winmain(const std::wstring& cmdline)
+    {
+        vector<wstring> result;
+        vector<string> aux = split_winmain(to_internal(cmdline));
+        for (unsigned i = 0, e = result.size(); i < e; ++i)
+            result.push_back(from_utf8(aux[i]));
+        return result;        
+    }
+
+}}
+#endif