Zach's git repos / prosongsa
Backend for songs.zachdecook.com
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+/**
+ * @brief page.js tries to improve pageload speeds
+ * by processing client-side.
+ * @author Zach DeCook (zjd7calvin)
+ * @date 12, February 2017
+ * requires jQuery
+ */
+
+/**
+ * @brief zj_transpose2 transposes a line
+ */
+function zj_transpose2( line, transp )
+{
+ var newchords = zj_transparray( transp );
+ var newline = '';
+ var space = 0; ///@< Spaces that need to be added or removed.
+ for(var i = 0; i < line.length; i++)
+ {
+ var chari = line[i];
+ var nchar = line[i+1];
+ var upchar = line[i].toUpperCase();
+ var cval = upchar.charCodeAt(0);
+ // A-G
+ if( cval <= 71 && cval >=65 )
+ {
+ // Exception for Cmaj7
+ if( upchar == 'A' && nchar == 'j' )
+ {
+ newline += chari;
+ }
+ else if( nchar == 'b' || nchar =='#')
+ {
+ i++; //We have read an extra character now.
+ var newchord = newchords[upchar + nchar];
+ if( newchord.length == 1 )
+ {
+ // Need to insert an extra space.
+ space += 1;
+ }
+ newline += newchord;
+ }
+ else
+ {
+ var newchord = newchords[upchar];
+ if( newchord.length == 2 )
+ {
+ // Need to remove an extra space.
+ space -= 1;
+ }
+ newline += newchord;
+ }
+ }
+ else if ( chari == ' ' )
+ {
+ if( space >= 0)
+ {
+ for (var j = 0; j <= space; j++)
+ {
+ newline += ' ';
+ }
+ space = 0;
+ }
+ else
+ {
+ // Only balance negative spaces if one will be left remaining
+ if( nchar == ' ' )
+ {
+ i++;
+ space += 1;
+ }
+ newline += ' ';
+ }
+ }
+ else
+ {
+ newline += chari;
+ }
+ }
+ return newline;
+}
+
+function zj_transparray( transp )
+{
+ var chords =
+ ["C","C#","D","D#","E","F","F#","G","G#","A","Bb","B" ];
+ var newchords = [];
+ // Create array to map old chords to new ones
+ for (var i=0; i < 12; i++)
+ {
+ newchords[chords[i]] = chords[(i+transp+12)%12];
+ }
+ newchords["Db"] = newchords["C#"];
+ newchords["Eb"] = newchords["D#"];
+ newchords["Gb"] = newchords["F#"];
+ newchords["Ab"] = newchords["G#"];
+ newchords["A#"] = newchords["Bb"];
+ return newchords;
+}
+
+function transpadd( fromkey, integer )
+{
+ var chords = {C:0, Db:1, D:2, Eb:3, E:4, F:5, Gb:6, G:7, Ab:8, A:9, Bb:10, B:11};
+ chords["C#"] = chords["Db"];
+ chords["D#"] = chords["Eb"];
+ chords["F#"] = chords["Gb"];
+ chords["G#"] = chords["Ab"];
+ chords["A#"] = chords["Bb"];
+ var ochords = [ "C","Db","D","Eb","E","F","Gb","G","Ab","A","Bb","B" ];
+
+ var val = ochords[(parseInt(chords[fromkey]) + integer + 24)%12];
+ return val;
+}