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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 = array_flip( [ "C","C#","D","D#","E","F","F#","G","G#","A","A#","B" ]);
chords["Db"] = chords["C#"];
chords["Eb"] = chords["D#"];
chords["Gb"] = chords["F#"];
chords["Ab"] = chords["G#"];
chords["Bb"] = chords["A#"];
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;
}
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