libsaria: Format each tag as it is read in

I lowercase everything, strip out some characters, and create a linked
list of each word for each tag.

include/libsaria/tags.h

@@ -3,6 +3,7 @@
 
 #include <libsaria/files.h>
 
+#include <list>
 #include <string>
 using namespace std;
 
@@ -24,7 +25,13 @@ class TrackTag
 		int channels;
 		ino_t inode;
 
+		list<string> title_words;
+		list<string> artist_words;
+		list<string> album_words;
+
 		void make_lenstr();
+		void format_tag(string &, list<string> &);
+		void format_tags();
 
 	public:
 		TrackTag();

libsaria/path/tags.cpp

@@ -29,6 +29,10 @@ TrackTag::TrackTag(const TrackTag &tag)
 	bitrate  = tag.bitrate;
 	sample   = tag.sample;
 	channels = tag.channels;
+
+	title_words  = tag.title_words;
+	artist_words = tag.artist_words;
+	album_words  = tag.album_words;
 }
 
 TrackTag::TrackTag(string file, ino_t ino)
@@ -60,6 +64,7 @@ TrackTag::TrackTag(string file, ino_t ino)
 	channels = prop->channels();
 
 	make_lenstr();
+	format_tags();
 }
 
 TrackTag::TrackTag(InFile &in)
@@ -78,6 +83,8 @@ TrackTag::TrackTag(InFile &in)
 	bitrate  = in.read_int();
 	sample   = in.read_int();
 	channels = in.read_int();
+
+	format_tags();
 }
 
 TrackTag::~TrackTag()
@@ -118,6 +125,58 @@ void TrackTag::make_lenstr()
 	lenstr = stream.str();
 }
 
+void TrackTag::format_tag(string &tag, list<string> &tag_list)
+{
+	string word;
+	char c, diff = 'a' - 'A';
+
+	for (unsigned int i = 0; i < tag.size(); i++) {
+		c = tag[i];
+		// Character already lower case
+		if ( (c >= 'a') && (c <= 'z') )
+			word += c;
+		// Convert uppercase to lowercase
+		else if ( (c >= 'A') && (c <= 'Z') )
+			word += (c + diff);
+		// Keep numbers
+		else if ( (c >= '0') && (c <= '9') )
+			word += c;
+		else {
+			// These characters indicate a new word
+			switch (c) {
+			case '-':
+			case '\\':
+			case '/':
+			case ',':
+			case ';':
+			case '(':
+			case ')':
+			case '_':
+			case '~':
+			case '+':
+			case '"':
+			case ' ':
+				if (word != "")
+					tag_list.push_back(word);
+				word = "";
+				break;
+			default:
+				break;
+			};
+		}
+	}
+
+	if (word != "")
+		tag_list.push_back(word);
+}
+
+void TrackTag::format_tags()
+{
+	format_tag(title,  title_words);
+	format_tag(artist, artist_words);
+	format_tag(album,  album_words);
+}
+
 ino_t TrackTag::get_inode()
 {
 	return inode;