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2.5 手動変換
理論的には、convert-ly
のようなプログラムはすべての構文変更を処理できます。
After all, a computer program interprets the old
version and the new version, so another computer program can
translate one file into another1.
しかしながら、LilyPond プロジェクトの資源には限りがあり、すべての変換を自動化することはできません。以下は既知の問題のリストです。
1.6->2.0: Doesn't always convert figured bass correctly, specifically things like {< >}. Mats' comment on working around this: To be able to run convert-ly on it, I first replaced all occurrences of '{<' to some dummy like '{#' and similarly I replaced '>}' with '&}'. After the conversion, I could then change back from '{ #' to '{ <' and from '& }' to '> }'. Doesn't convert all text markup correctly. In the old markup syntax, it was possible to group a number of markup commands together within parentheses, e.g. -#'((bold italic) "string") This will incorrectly be converted into -\markup{{\bold italic} "string"} instead of the correct -\markup{\bold \italic "string"} 2.0->2.2: Doesn't handle \partcombine Doesn't do \addlyrics => \lyricsto, this breaks some scores with multiple stanzas. 2.0->2.4: \magnify isn't changed to \fontsize. - \magnify #m => \fontsize #f, where f = 6ln(m)/ln(2) remove-tag isn't changed. - \applyMusic #(remove-tag '. . .) => \keepWithTag #'. . . first-page-number isn't changed. - first-page-number no => print-first-page-number = ##f Line breaks in header strings aren't converted. - \\\\ as line break in \header strings => \markup \center-align < "First Line" "Second Line" > Crescendo and decrescendo terminators aren't converted. - \rced => \! - \rc => \! 2.2->2.4: \turnOff (used in \set Staff.VoltaBracket = \turnOff) is not properly converted. 2.4.2->2.5.9 \markup{ \center-align <{ ... }> } should be converted to: \markup{ \center-align {\line { ... }} } but now, \line is missing. 2.4->2.6 Special LaTeX characters such as $~$ in text are not converted to UTF8. 2.8 \score{} must now begin with a music expression. Anything else (particularly \header{}) must come after the music.
脚注
[1] At least, this is possible in any LilyPond file which does not contain scheme. If there is scheme in the file, then the LilyPond file contains a Turing-complete language, and we run into problems with the famous “Halting Problem” in computer science.
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