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<?php
namespace App\Http\Controllers;
use App\Song;
use Illuminate\Http\Request;
class SongController extends Controller
{
public function show( $songNumber )
{
$song = Song::where('number', $songNumber )->first();
$lines = explode( "\n", $song['text'] );
$newText = '';
$transp = $_GET['transp'] ?? 0;
foreach( $lines as $line ){
$line = htmlspecialchars( $line );
if ( $this->chordline( $line ) ) {
if ( $transp != 0) {
$line = $this->z_transpose2( $line, $transp );
}
$class = ! isset( $song['key'] ) ?
"tabs chord$transp"
: "tabs chord" . $this->transpadd( $song['key'], $transp );
$line = str_replace(
array('{','}'),
array('</b>{', "}<b class='$class'>" ),
$line );
$newText .= "<b class='$class'>" . $line . "</b>\n";
} else {
$newText .= "$line\n";
}
}
$song['escapedText'] = $newText;
return view('song', ['song' => $song, 'transp' => $transp ] );
}
/**
* @brief Determine whether or not this line contains chords.
*/
private function chordline($line)
{
$chords =
array( "C","C#","D","D#","E","F","F#","G","G#","A#","B",//"A",
"Db", "Eb", "Gb", "Bb",//"Ab",
"Cm", "Dm", "Fm", "Gm", "Bm", //"Em", "Am",
);
$ambiguous = array( "Ab", "Em", "Am", "A" );
$line = str_replace(array('/','7', "\n", '2', '4'), ' ', $line);
$tokens = array_filter(explode(' ', $line));
$badtokens = 0;
$ambtokens = 0;
$goodtokens = 0;
foreach ($tokens as $token) {
if( in_array( substr($token, 0,2), $chords ) ) $goodtokens++;
else if ( in_array( substr( $token, 0,2), $ambiguous) ) $ambtokens++;
else if( $badtokens > 10 ) return FALSE;
else $badtokens++;
}
return ($goodtokens *2)+ $ambtokens >= $badtokens;
}
private function z_transpose2( $line, $transp )
{
$newchords = $this->z_transparray( $transp );
$newline = '';
$space = 0; ///@< Spaces that need to be added or removed.
$inCurly = 0;
for($i = 0; $i < strlen($line); $i++) {
$char = $line[$i];
$nchar = isset($line[$i+1]) ? $line[$i+1] : '';
$upchar = strtoupper($line[$i]);
$cval = ord($upchar);
if ( $char == '}' && $inCurly ){ $inCurly = 0;}
if ( $char == '{' || $inCurly ){ $inCurly = 1; $newline .= $char; continue;}
// A-G
if( $cval <= 71 && $cval >=65 ) {
// Exception for Cmaj7
if( $upchar == 'A' && $nchar == 'j' ) {
$newline .= $char;
} else if( $nchar == 'b' || $nchar =='#') {
$i++; //We have read an extra character now.
$newchord = $newchords[$upchar . $nchar];
if( strlen($newchord) == 1 ) {
// Need to insert an extra space.
$space += 1;
}
$newline .= $newchord;
} else {
$newchord = $newchords[$upchar];
if( strlen($newchord) == 2 ) {
// Need to remove an extra space.
$space -= 1;
}
$newline .= $newchord;
}
} else if ( $char == ' ' ) {
if( $space >= 0) {
for ($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 .= $char;
}
}
return $newline;
}
private function z_transparray( $transp )
{
$chords =
array( "C","C#","D","D#","E","F","F#","G","G#","A","Bb","B" );
$newchords = array();
// Create array to map old chords to new ones
for ($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;
}
private function transpadd( $fromkey, $integer )
{
$chords = array_flip(array( "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#"];
$ochords = array( "C","Db","D","Eb","E","F","Gb","G","Ab","A","Bb","B" );
$fromkey = trim($fromkey, 'm');
return $ochords[($chords[$fromkey] + $integer + 24)%12];
}
}
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