X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fstrings%2Fformat.cpp;fp=source%2Fstrings%2Fformat.cpp;h=dfd3800841033cbafba518b9b1417f193c30ab77;hb=3a965c87750250c8facc9dbff02aeb3a88e19f05;hp=0000000000000000000000000000000000000000;hpb=ab956fd92f2110197c8e035b12dafa30a18b8ae1;p=libs%2Fcore.git

diff --git a/source/strings/format.cpp b/source/strings/format.cpp
new file mode 100644
index 0000000..dfd3800
--- /dev/null
+++ b/source/strings/format.cpp
@@ -0,0 +1,79 @@
+/* $Id$
+
+This file is part of libmspstrings
+Copyright © 2006-2007 Mikko Rasa
+Distributed under the LGPL
+*/
+
+#include "format.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