Move files around to prepare for assimilation into core

[libs/core.git] / source / strings / formatter.cpp

diff --git a/source/strings/formatter.cpp b/source/strings/formatter.cpp
new file mode 100644 (file)
index 0000000..d9d311d
--- /dev/null
+++ b/source/strings/formatter.cpp
@@ -0,0 +1,79 @@
+/* $Id$
+
+This file is part of libmspstrings
+Copyright © 2006-2007 Mikko Rasa
+Distributed under the LGPL
+*/
+
+#include "formatter.h"
+
+using namespace std;
+
+namespace Msp {
+
+Formatter::Formatter(const string &f):
+       fmt(f),
+       pos(fmt.begin())
+{
+       advance();
+}
+
+/**
+Returns the result of the formatting operation.  Will throw if not enough
+values have been fed to the formatter.
+*/
+const string &Formatter::str() const
+{
+       if(pos!=fmt.end())
+               throw Exception("Too few arguments for format");
+
+       return result;
+}
+
+/**
+Advances the pos iterator to the next conversion, adding literal characters to
+the result.  The iterator is left at the second character of the conversion
+(i.e. after the %).
+*/
+void Formatter::advance()
+{
+       for(; pos!=fmt.end(); ++pos)
+       {
+               if(*pos=='%')
+               {
+                       ++pos;
+                       if(pos==fmt.end())
+                               throw Exception("Malformed format string");
+                       if(*pos!='%')
+                               break;
+               }
+
+               result += *pos;
+       }
+}
+
+/**
+Reads the next conversion from the format string and returns a corresponding
+Fmt object.
+*/
+Fmt Formatter::get_conversion()
+{
+       if(pos==fmt.end())
+               throw Exception("Too many arguments for format");
+
+       string::iterator i = pos;
+       for(; i!=fmt.end(); ++i)
+               if(isalpha(*i))
+                       break;
+
+       if(i==fmt.end())
+               throw Exception("Malformed format string");
+
+       ++i;
+       string c(pos, i);
+       pos = i;
+
+       return Fmt(c);
+}
+
+} // namespace Msp