--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sources/format.cpp Wed Dec 10 19:17:00 2014 +0200
@@ -0,0 +1,107 @@
+/*
+ Copyright 2014 Teemu Piippo
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ 1. Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+ 3. Neither the name of the copyright holder nor the names of its
+ contributors may be used to endorse or promote products derived from
+ this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER
+ OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#include <cstdio>
+#include "format.h"
+
+//
+// Throws an error while formatting the string
+//
+static auto format_error (String fmtstr, const String errdescribe, int pos) -> void
+{
+ fmtstr.replace ("\n", " ");
+ fmtstr.replace ("\t", " ");
+ String errmsg ("With format string:\n" + fmtstr + "\n");
+
+ for (int x = 0; x < pos; ++x)
+ errmsg += "-";
+
+ errmsg += "^\n" + errdescribe;
+ // throw std::logic_error (errmsg.stdString());
+ std::fprintf (stderr, "%s", errmsg.chars());
+ std::exit (EXIT_FAILURE);
+}
+
+//
+// Main formatter algorithm autoion. Processes @fmtstr with @args and returns
+// the result.
+//
+auto format_args (const String& fmtstr, const Vector<String>& args) -> String
+{
+ String fmt = fmtstr;
+ int pos = 0;
+
+ while ((pos = fmt.find ("%", pos)) != -1)
+ {
+ if (fmt[pos + 1] == '%')
+ {
+ fmt.replace (pos, 2, "%");
+ pos++;
+ continue;
+ }
+
+ int ofs = 1;
+ char mod = '\0';
+
+ // handle modifiers
+ if (fmt[pos + ofs] == 's' or fmt[pos + ofs] == 'x' or fmt[pos + ofs] == 'd')
+ {
+ mod = fmt[pos + ofs];
+ ofs++;
+ }
+
+ if (fmt[pos + ofs] < '1' or fmt[pos + ofs] > '9')
+ {
+ format_error (fmtstr, "bad format string, expected non-zero digit with "
+ "optional modifier after '%%'", pos);
+ }
+
+ int i = fmt[pos + ofs] - '0';
+
+ if (i > args.size())
+ format_error (fmtstr, String ("Format argument #") + i + " used but not defined.", pos);
+
+ String replacement = args[i - 1];
+
+ switch (mod)
+ {
+ case 's': replacement = (replacement == "1") ? "" : "s"; break;
+ case 'd': replacement.sprintf ("%d", replacement[0]); break;
+ case 'x': replacement.sprintf ("0x%x", replacement.to_int()); break;
+ default: break;
+ }
+
+ fmt.replace (pos, 1 + ofs, replacement);
+ pos += replacement.length();
+ }
+
+ return fmt;
+}
+