A simple PHP script that converts the ChordPro syntax to plain text.

chordpro_to_text

<?php

$test = "Hello [C]song, this is [Am]wonderful. [E] [Am]";

print($test."\n");

$helper_line = $test;
$chord_line = "";
$lyrics_line = "";

$current_chord_length = 0;
$currently_chord = false;
$currently_lyrics = true;
while (strlen($helper_line) > 0) {
	$token = substr($helper_line, 0, 1);
	
	if ($token == "]" && $currently_chord) {
		$currently_chord = false;
	}
	if ($token == "[") {
		$currently_lyrics = false;
		while ($current_chord_length > 0) {
			$lyrics_line = $lyrics_line." ";
			if ($current_chord_length == 1) {
				$lyrics_line = $lyrics_line." ";
				$chord_line = $chord_line." ";
			}
			$current_chord_length -= 1;
		}
		if (substr($chord_line, -1) !== " ") {
			$chord_line = $chord_line." ";
			$lyrics_line = $lyrics_line." ";
		}
	}
	
	if ($currently_chord) {
		
		$chord_line = $chord_line.$token;
		$current_chord_length += 1;
	}
	
	if ($currently_lyrics) {
		$lyrics_line = $lyrics_line.$token;
		if ($current_chord_length == 0) {
			$chord_line = $chord_line." ";
		} else {
			$current_chord_length -= 1;
		}
	}
	
	if ($token == "[") {
		$currently_chord = true;
	}
	if ($token == "]" && !$currently_lyrics) {
		$currently_lyrics = true;
	}
	
	$helper_line = substr($helper_line, 1);
}


print("\n".$chord_line."\n");
print($lyrics_line."\n");

?>