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Albert Graef 2018-08-30 06:08:16 +02:00
parent bad70bfaf7
commit 395fd5ebe8
1 changed files with 38 additions and 31 deletions
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readconfig.c
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@ -894,47 +894,54 @@ re_press_temp_modifiers(void)
/* Parser for the MIDI message syntax. The same parser is used for both /* Parser for the MIDI message syntax. The same parser is used for both
the left-hand side (lhs) and the right-hand side (rhs) of a translation. the left-hand side (lhs) and the right-hand side (rhs) of a translation.
The syntax we actually parse here is, somewhat abridged: The syntax we actually parse here is the following:
tok ::= ( note | msg ) [ number ] [ "[" number "]" ] [ "-" number] [ incr ] tok ::= msg [ number ] [ steps ] [ "-" number] [ flag ]
msg ::= note | other
note ::= ( "a" | ... | "g" ) [ "#" | "b" ] note ::= ( "a" | ... | "g" ) [ "#" | "b" ]
msg ::= "ch" | "pb" | "pc" | "cc" | "cp" | "kp:" note other ::= "ch" | "pb" | "pc" | "cc" | "cp" | "kp:" note
incr ::= "-" | "+" | "=" | "<" | ">" | "~" steps ::= "[" number "]" | "{" list "}" | "[" number "]" "{" list "}"
list ::= number { "," number | ":" number }
flag ::= "-" | "+" | "=" | "<" | ">" | "~" | "'"
Case is insignificant. Numbers are always in decimal. The meaning of Case is insignificant. Numbers are always in decimal. The meaning of
the first number depends on the context (octave number for notes and the first number depends on the context (octave number for notes and
key pressure, the actual data byte for other messages). This can key pressure, the actual data byte for other messages). This can
optionally be followed by a number in brackets, denoting a step optionally be followed by a number in brackets, denoting a step size,
size. Also optionally, the suffix with the third number (after the or (in some translations) a list of values in curly braces. Also
dash) denotes the MIDI channel; otherwise the default MIDI channel is optionally, the suffix with the third number (after the dash) denotes
used. the MIDI channel; otherwise the default MIDI channel is used.
Note that not all combinations are possible -- "pb" and "cp" have no Note that not all combinations are possible -- "pb" and "cp" have no
data byte; and "ch" must *not* occur on the lhs at all, and is data byte, "pc" no step size and flag; and "ch" must *not* occur on
followed by just a channel number. (In fact, "ch" is no real MIDI the lhs at all, and is followed by just a channel number. (In fact,
message at all; it just sets the default MIDI channel for subsequent "ch" is no real MIDI message at all; it just sets the default MIDI
messages in the output sequence.) channel for subsequent messages in the output sequence.)
The incr flag indicates an "incremental" controller or pitch bend The optional flag at the end of the token indicates an "incremental"
value which responds to up ("+") and down ("-") changes; it is only controller or pitch bend value which responds to up ("+") and down
permitted in conjunction with "cc", "pb", "cp" and "kp", and (with ("-") changes; it is only permitted (with one exception, see below)
one exception, see below) only on the lhs of a translation. In on the lhs of a translation. In addition, "<" and ">" can be used in
addition, "<" and ">" can be used in lieu of "-" and "-" to indicate lieu of "-" and "-" to indicate a relative controller in "sign bit"
a relative controller in "sign bit" representation, where controller representation, where controller values > 64 denote down, and values
values > 64 denote down, and values < 64 up changes. This notation is < 64 up changes. This notation is only permitted with "cc". It is
only permitted with "cc". It is used for endless rotary encoders, jog used for endless rotary encoders, jog wheels and the like, as can be
wheels and the like, as can be found, e.g., on Mackie-like units. found, e.g., on Mackie-like units.
Finally, the flags "=" and "~" are used in lieu of "+"/"-" or The flags "=" and "~" are used in lieu of "+"/"-" or "<"/">",
"<"/">", respectively, to denote a "bidirectional" translation which respectively, to denote a "bidirectional" translation which applies
applies to both positive and negative changes of the controller or to both positive and negative changes of the parameter value. Since
pitch bend value. Since bidirectional translations cannot have bidirectional translations cannot have distinct keystroke sequences
distinct keystroke sequences for up and down changes associated with for up and down changes associated with them, this makes most sense
them, this makes most sense with pure MIDI translations. with pure MIDI translations.
The only incr flag which is also permitted on the rhs of a Among these, only the "~" flag is also permitted on the rhs of a
translation, and only with "cc", is the "~" flag, which is used to translation, and only with "cc", where it is used to denote a
denote a relative (sign bit) controller change on output. */ relative (sign bit) controller change on output.
Finally, the special "transposition" flag "'" is used in so-called
"mod" translations where it swaps offset and data value; please check
the documentation for details. */
static int note_number(char c, char b, int k) static int note_number(char c, char b, int k)
{ {