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authornoptuno <repollo.marrero@gmail.com>2023-04-28 02:29:30 +0200
committernoptuno <repollo.marrero@gmail.com>2023-04-28 02:29:30 +0200
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+"""
+ pygments.lexers.lilypond
+ ~~~~~~~~~~~~~~~~~~~~~~~~
+
+ Lexer for LilyPond.
+
+ :copyright: Copyright 2006-2023 by the Pygments team, see AUTHORS.
+ :license: BSD, see LICENSE for details.
+"""
+
+import re
+
+from pygments.lexer import bygroups, default, inherit, words
+from pygments.lexers.lisp import SchemeLexer
+from pygments.lexers._lilypond_builtins import (
+ keywords, pitch_language_names, clefs, scales, repeat_types, units,
+ chord_modifiers, pitches, music_functions, dynamics, articulations,
+ music_commands, markup_commands, grobs, translators, contexts,
+ context_properties, grob_properties, scheme_functions, paper_variables,
+ header_variables
+)
+from pygments.token import Token
+
+__all__ = ["LilyPondLexer"]
+
+# In LilyPond, (unquoted) name tokens only contain letters, hyphens,
+# and underscores, where hyphens and underscores must not start or end
+# a name token.
+#
+# Note that many of the entities listed as LilyPond built-in keywords
+# (in file `_lilypond_builtins.py`) are only valid if surrounded by
+# double quotes, for example, 'hufnagel-fa1'. This means that
+# `NAME_END_RE` doesn't apply to such entities in valid LilyPond code.
+NAME_END_RE = r"(?=\d|[^\w\-]|[\-_][\W\d])"
+
+def builtin_words(names, backslash, suffix=NAME_END_RE):
+ prefix = r"[\-_^]?"
+ if backslash == "mandatory":
+ prefix += r"\\"
+ elif backslash == "optional":
+ prefix += r"\\?"
+ else:
+ assert backslash == "disallowed"
+ return words(names, prefix, suffix)
+
+
+class LilyPondLexer(SchemeLexer):
+ """
+ Lexer for input to LilyPond, a text-based music typesetter.
+
+ .. important::
+
+ This lexer is meant to be used in conjunction with the ``lilypond`` style.
+
+ .. versionadded:: 2.11
+ """
+ name = 'LilyPond'
+ url = 'https://lilypond.org'
+ aliases = ['lilypond']
+ filenames = ['*.ly']
+ mimetypes = []
+
+ flags = re.DOTALL | re.MULTILINE
+
+ # Because parsing LilyPond input is very tricky (and in fact
+ # impossible without executing LilyPond when there is Scheme
+ # code in the file), this lexer does not try to recognize
+ # lexical modes. Instead, it catches the most frequent pieces
+ # of syntax, and, above all, knows about many kinds of builtins.
+
+ # In order to parse embedded Scheme, this lexer subclasses the SchemeLexer.
+ # It redefines the 'root' state entirely, and adds a rule for #{ #}
+ # to the 'value' state. The latter is used to parse a Scheme expression
+ # after #.
+
+ def get_tokens_unprocessed(self, text):
+ """Highlight Scheme variables as LilyPond builtins when applicable."""
+ for index, token, value in super().get_tokens_unprocessed(text):
+ if token is Token.Name.Function or token is Token.Name.Variable:
+ if value in scheme_functions:
+ token = Token.Name.Builtin.SchemeFunction
+ elif token is Token.Name.Builtin:
+ token = Token.Name.Builtin.SchemeBuiltin
+ yield index, token, value
+
+ tokens = {
+ "root": [
+ # Whitespace.
+ (r"\s+", Token.Text.Whitespace),
+
+ # Multi-line comments. These are non-nestable.
+ (r"%\{.*?%\}", Token.Comment.Multiline),
+
+ # Simple comments.
+ (r"%.*?$", Token.Comment.Single),
+
+ # End of embedded LilyPond in Scheme.
+ (r"#\}", Token.Punctuation, "#pop"),
+
+ # Embedded Scheme, starting with # ("delayed"),
+ # or $ (immediate). #@ and and $@ are the lesser known
+ # "list splicing operators".
+ (r"[#$]@?", Token.Punctuation, "value"),
+
+ # Any kind of punctuation:
+ # - sequential music: { },
+ # - parallel music: << >>,
+ # - voice separator: << \\ >>,
+ # - chord: < >,
+ # - bar check: |,
+ # - dot in nested properties: \revert NoteHead.color,
+ # - equals sign in assignments and lists for various commands:
+ # \override Stem.color = red,
+ # - comma as alternative syntax for lists: \time 3,3,2 4/4,
+ # - colon in tremolos: c:32,
+ # - double hyphen and underscore in lyrics: li -- ly -- pond __
+ # (which must be preceded by ASCII whitespace)
+ (r"""(?x)
+ \\\\
+ | (?<= \s ) (?: -- | __ )
+ | [{}<>=.,:|]
+ """, Token.Punctuation),
+
+ # Pitches, with optional octavation marks, octave check,
+ # and forced or cautionary accidental.
+ (words(pitches, suffix=r"=?[',]*!?\??" + NAME_END_RE), Token.Pitch),
+
+ # Strings, optionally with direction specifier.
+ (r'[\-_^]?"', Token.String, "string"),
+
+ # Numbers.
+ (r"-?\d+\.\d+", Token.Number.Float), # 5. and .5 are not allowed
+ (r"-?\d+/\d+", Token.Number.Fraction),
+ # Integers, or durations with optional augmentation dots.
+ # We have no way to distinguish these, so we highlight
+ # them all as numbers.
+ #
+ # Normally, there is a space before the integer (being an
+ # argument to a music function), which we check here. The
+ # case without a space is handled below (as a fingering
+ # number).
+ (r"""(?x)
+ (?<= \s ) -\d+
+ | (?: (?: \d+ | \\breve | \\longa | \\maxima )
+ \.* )
+ """, Token.Number),
+ # Separates duration and duration multiplier highlighted as fraction.
+ (r"\*", Token.Number),
+
+ # Ties, slurs, manual beams.
+ (r"[~()[\]]", Token.Name.Builtin.Articulation),
+
+ # Predefined articulation shortcuts. A direction specifier is
+ # required here.
+ (r"[\-_^][>^_!.\-+]", Token.Name.Builtin.Articulation),
+
+ # Fingering numbers, string numbers.
+ (r"[\-_^]?\\?\d+", Token.Name.Builtin.Articulation),
+
+ # Builtins.
+ (builtin_words(keywords, "mandatory"), Token.Keyword),
+ (builtin_words(pitch_language_names, "disallowed"), Token.Name.PitchLanguage),
+ (builtin_words(clefs, "disallowed"), Token.Name.Builtin.Clef),
+ (builtin_words(scales, "mandatory"), Token.Name.Builtin.Scale),
+ (builtin_words(repeat_types, "disallowed"), Token.Name.Builtin.RepeatType),
+ (builtin_words(units, "mandatory"), Token.Number),
+ (builtin_words(chord_modifiers, "disallowed"), Token.ChordModifier),
+ (builtin_words(music_functions, "mandatory"), Token.Name.Builtin.MusicFunction),
+ (builtin_words(dynamics, "mandatory"), Token.Name.Builtin.Dynamic),
+ # Those like slurs that don't take a backslash are covered above.
+ (builtin_words(articulations, "mandatory"), Token.Name.Builtin.Articulation),
+ (builtin_words(music_commands, "mandatory"), Token.Name.Builtin.MusicCommand),
+ (builtin_words(markup_commands, "mandatory"), Token.Name.Builtin.MarkupCommand),
+ (builtin_words(grobs, "disallowed"), Token.Name.Builtin.Grob),
+ (builtin_words(translators, "disallowed"), Token.Name.Builtin.Translator),
+ # Optional backslash because of \layout { \context { \Score ... } }.
+ (builtin_words(contexts, "optional"), Token.Name.Builtin.Context),
+ (builtin_words(context_properties, "disallowed"), Token.Name.Builtin.ContextProperty),
+ (builtin_words(grob_properties, "disallowed"),
+ Token.Name.Builtin.GrobProperty,
+ "maybe-subproperties"),
+ # Optional backslashes here because output definitions are wrappers
+ # around modules. Concretely, you can do, e.g.,
+ # \paper { oddHeaderMarkup = \evenHeaderMarkup }
+ (builtin_words(paper_variables, "optional"), Token.Name.Builtin.PaperVariable),
+ (builtin_words(header_variables, "optional"), Token.Name.Builtin.HeaderVariable),
+
+ # Other backslashed-escaped names (like dereferencing a
+ # music variable), possibly with a direction specifier.
+ (r"[\-_^]?\\.+?" + NAME_END_RE, Token.Name.BackslashReference),
+
+ # Definition of a variable. Support assignments to alist keys
+ # (myAlist.my-key.my-nested-key = \markup \spam \eggs).
+ (r"""(?x)
+ (?: [^\W\d] | - )+
+ (?= (?: [^\W\d] | [\-.] )* \s* = )
+ """, Token.Name.Lvalue),
+
+ # Virtually everything can appear in markup mode, so we highlight
+ # as text. Try to get a complete word, or we might wrongly lex
+ # a suffix that happens to be a builtin as a builtin (e.g., "myStaff").
+ (r"([^\W\d]|-)+?" + NAME_END_RE, Token.Text),
+ (r".", Token.Text),
+ ],
+ "string": [
+ (r'"', Token.String, "#pop"),
+ (r'\\.', Token.String.Escape),
+ (r'[^\\"]+', Token.String),
+ ],
+ "value": [
+ # Scan a LilyPond value, then pop back since we had a
+ # complete expression.
+ (r"#\{", Token.Punctuation, ("#pop", "root")),
+ inherit,
+ ],
+ # Grob subproperties are undeclared and it would be tedious
+ # to maintain them by hand. Instead, this state allows recognizing
+ # everything that looks like a-known-property.foo.bar-baz as
+ # one single property name.
+ "maybe-subproperties": [
+ (r"\s+", Token.Text.Whitespace),
+ (r"(\.)((?:[^\W\d]|-)+?)" + NAME_END_RE,
+ bygroups(Token.Punctuation, Token.Name.Builtin.GrobProperty)),
+ default("#pop"),
+ ]
+ }