Carl
This isn't a problem specific to chordmode. If you use
an identifier c you get a similar error about unexpected
notename_pitch whatever the input mode. The problem is
the identifier m.
Because m is a valid chord modifier and the parser/lexer
is scanning for chordmodifiers or pitchnames it considers
the m to be a chord modifier rather than a variable name.
It seem the parser/lexer relies on finding a token which
is invalid in the current input mode to cause termination
of that mode. So your first expression is ok because m
is invalid in notemode.
Such errors can be avoided by:
(a) placing all variable definitions before music
(b) not using single-character variable names.
Trevor
----- Original Message -----
From: "Carl D. Sorensen" <[EMAIL PROTECTED]>
To: "lily-devel" <[EMAIL PROTECTED]>; <bug-lilypond@gnu.org>
Sent: Friday, August 08, 2008 2:54 AM
Subject: Help with debugging apparent error in parser
Dear LilyPond team,
As I developed the transposable fretboards, I have apparently run into an
error in the parser.
When \chordmode is done, it apparently leaves the parser in a fragile state.
Let me show some code:
%%%%%%% Begin code
myDisplayMusic =
#(define-music-function (parser location music)
(ly:music?)
(display-scheme-music music)
(make-music 'SequentialMusic 'void #t))
%\myDisplayMusic <c e g> % Expression 1 -- no problem
\myDisplayMusic \chordmode{c} % Expression 2 -- causes error
m = \relative c' { c d e}
\context Staff {
\m
}
%%%%%%%% End code
If Expression 1 in the above code is uncommented, and expression 2 is
commented, the code compiles normally.
If Expression 1 is commented, and Expression 2 is uncommented, there is a
parse error:
parseerror.ly:14:0: error: syntax error, unexpected CHORD_MODIFIER
m = \relative c' { c d e}
parseerror.ly:17:2: error: unknown escaped string: `\m'
\m
parseerror.ly:17:2: error: syntax error, unexpected STRING
\m
parseerror.ly:16:0: error: errors found, ignoring music expression
\context Staff {
Even if Expression 1 is uncommented and follows Expression 2, I get the same
error. It appears that the parser somehow gets stuck using chordmode
parsing.
I have no idea how to debug this problem. Any suggestions? Or can anybody
fix this?
Thanks,
Carl
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