lilypond-0.0.1

diff --git a/command.hh b/command.hh
new file mode 100644 (file)
index 0000000..353bf5d
--- /dev/null
+++ b/command.hh
@@ -0,0 +1,69 @@
+#ifndef COMMAND_HH
+#define COMMAND_HH
+#include "glob.hh"
+#include "mtime.hh"
+#include "vray.hh"
+enum Commandcode {
+       NOP,
+       INTERPRET,
+       TYPESET,
+       BREAK_PRE,BREAK_MIDDLE, BREAK_POST, BREAK_END, 
+};
+/// set a nonrythmical symbol
+struct Command {
+    Commandcode code;
+
+    Mtime when;
+    /// analogous to argv[]
+    svec<String> args;
+};
+
+/**
+    A nonrhythmical "thing" in a  staff is called a "command".
+    Commands have these properties:
+
+    \begin{itemize}
+    \item They are \bf{not} rhythmical, i.e. they do not have  a duration
+    \item They have a staff-wide impact, i.e. a command cannot be targeted at
+    only one voice in the staff: two voices sharing a staff can't have
+    different clefs
+    \item Commands are ordered, that is, when from musical point of view the
+    commands happen simultaneously, the order in which Staff receives the
+    commands can still make a difference in the output
+    \item Some commands are actually score wide, so Score has to issue these
+    commands to the Staff, eg. BREAK commands
+    \end{itemize}
+
+    At this moment we have three classes of commands:
+    \begin{description}
+    INTERPRET commands are not grouped.
+    \item[TYPESET] These commands instruct the Staff to
+    typeset symbols on the output, eg meter/clef/key changes
+    \item[INTERPRET] These commands do not produce output, instead,
+    they change the interpretation of other commands or requests. 
+    example: shift output vertically, set the key.
+    \item[BREAK_XXX] These commands group TYPESET commands in
+    prebreak and postbreak commands. \See{Col}.    
+    Staff can insert additional commands in a sequence of BREAK_XXX
+    commands, eg. key change commands
+
+    \end{description}
+    
+    These commands are generated by Score, since they have to be the
+    same for the whole score.
+    
+
+    \begin{description}
+    \item[BREAK_PRE]
+    \item[BREAK_MIDDLE]
+    \item[BREAK_POST]
+    \item[BREAK_END]
+    \item[TYPESET] METER,BAR
+    \end{description}
+ 
+
+    Commands can be freely copied, they do not have virtual methods.
+    */
+
+
+#endif