226 lines
9.5 KiB
Python
226 lines
9.5 KiB
Python
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"""
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pygments.lexers.lilypond
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~~~~~~~~~~~~~~~~~~~~~~~~
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Lexer for LilyPond.
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:copyright: Copyright 2006-2024 by the Pygments team, see AUTHORS.
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:license: BSD, see LICENSE for details.
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"""
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import re
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from pygments.lexer import bygroups, default, inherit, words
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from pygments.lexers.lisp import SchemeLexer
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from pygments.lexers._lilypond_builtins import (
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keywords, pitch_language_names, clefs, scales, repeat_types, units,
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chord_modifiers, pitches, music_functions, dynamics, articulations,
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music_commands, markup_commands, grobs, translators, contexts,
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context_properties, grob_properties, scheme_functions, paper_variables,
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header_variables
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)
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from pygments.token import Token
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__all__ = ["LilyPondLexer"]
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# In LilyPond, (unquoted) name tokens only contain letters, hyphens,
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# and underscores, where hyphens and underscores must not start or end
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# a name token.
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#
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# Note that many of the entities listed as LilyPond built-in keywords
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# (in file `_lilypond_builtins.py`) are only valid if surrounded by
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# double quotes, for example, 'hufnagel-fa1'. This means that
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# `NAME_END_RE` doesn't apply to such entities in valid LilyPond code.
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NAME_END_RE = r"(?=\d|[^\w\-]|[\-_][\W\d])"
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def builtin_words(names, backslash, suffix=NAME_END_RE):
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prefix = r"[\-_^]?"
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if backslash == "mandatory":
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prefix += r"\\"
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elif backslash == "optional":
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prefix += r"\\?"
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else:
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assert backslash == "disallowed"
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return words(names, prefix, suffix)
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class LilyPondLexer(SchemeLexer):
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"""
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Lexer for input to LilyPond, a text-based music typesetter.
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.. important::
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This lexer is meant to be used in conjunction with the ``lilypond`` style.
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"""
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name = 'LilyPond'
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url = 'https://lilypond.org'
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aliases = ['lilypond']
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filenames = ['*.ly']
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mimetypes = []
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version_added = '2.11'
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flags = re.DOTALL | re.MULTILINE
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# Because parsing LilyPond input is very tricky (and in fact
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# impossible without executing LilyPond when there is Scheme
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# code in the file), this lexer does not try to recognize
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# lexical modes. Instead, it catches the most frequent pieces
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# of syntax, and, above all, knows about many kinds of builtins.
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# In order to parse embedded Scheme, this lexer subclasses the SchemeLexer.
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# It redefines the 'root' state entirely, and adds a rule for #{ #}
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# to the 'value' state. The latter is used to parse a Scheme expression
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# after #.
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def get_tokens_unprocessed(self, text):
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"""Highlight Scheme variables as LilyPond builtins when applicable."""
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for index, token, value in super().get_tokens_unprocessed(text):
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if token is Token.Name.Function or token is Token.Name.Variable:
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if value in scheme_functions:
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token = Token.Name.Builtin.SchemeFunction
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elif token is Token.Name.Builtin:
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token = Token.Name.Builtin.SchemeBuiltin
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yield index, token, value
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tokens = {
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"root": [
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# Whitespace.
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(r"\s+", Token.Text.Whitespace),
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# Multi-line comments. These are non-nestable.
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(r"%\{.*?%\}", Token.Comment.Multiline),
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# Simple comments.
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(r"%.*?$", Token.Comment.Single),
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# End of embedded LilyPond in Scheme.
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(r"#\}", Token.Punctuation, "#pop"),
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# Embedded Scheme, starting with # ("delayed"),
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# or $ (immediate). #@ and and $@ are the lesser known
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# "list splicing operators".
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(r"[#$]@?", Token.Punctuation, "value"),
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# Any kind of punctuation:
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# - sequential music: { },
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# - parallel music: << >>,
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# - voice separator: << \\ >>,
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# - chord: < >,
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# - bar check: |,
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# - dot in nested properties: \revert NoteHead.color,
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# - equals sign in assignments and lists for various commands:
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# \override Stem.color = red,
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# - comma as alternative syntax for lists: \time 3,3,2 4/4,
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# - colon in tremolos: c:32,
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# - double hyphen and underscore in lyrics: li -- ly -- pond __
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# (which must be preceded by ASCII whitespace)
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(r"""(?x)
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\\\\
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| (?<= \s ) (?: -- | __ )
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| [{}<>=.,:|]
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""", Token.Punctuation),
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# Pitches, with optional octavation marks, octave check,
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# and forced or cautionary accidental.
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(words(pitches, suffix=r"=?[',]*!?\??" + NAME_END_RE), Token.Pitch),
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# Strings, optionally with direction specifier.
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(r'[\-_^]?"', Token.String, "string"),
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# Numbers.
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(r"-?\d+\.\d+", Token.Number.Float), # 5. and .5 are not allowed
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(r"-?\d+/\d+", Token.Number.Fraction),
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# Integers, or durations with optional augmentation dots.
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# We have no way to distinguish these, so we highlight
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# them all as numbers.
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#
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# Normally, there is a space before the integer (being an
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# argument to a music function), which we check here. The
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# case without a space is handled below (as a fingering
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# number).
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(r"""(?x)
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(?<= \s ) -\d+
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| (?: (?: \d+ | \\breve | \\longa | \\maxima )
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\.* )
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""", Token.Number),
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# Separates duration and duration multiplier highlighted as fraction.
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(r"\*", Token.Number),
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# Ties, slurs, manual beams.
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(r"[~()[\]]", Token.Name.Builtin.Articulation),
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# Predefined articulation shortcuts. A direction specifier is
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# required here.
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(r"[\-_^][>^_!.\-+]", Token.Name.Builtin.Articulation),
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# Fingering numbers, string numbers.
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(r"[\-_^]?\\?\d+", Token.Name.Builtin.Articulation),
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# Builtins.
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(builtin_words(keywords, "mandatory"), Token.Keyword),
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(builtin_words(pitch_language_names, "disallowed"), Token.Name.PitchLanguage),
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(builtin_words(clefs, "disallowed"), Token.Name.Builtin.Clef),
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(builtin_words(scales, "mandatory"), Token.Name.Builtin.Scale),
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(builtin_words(repeat_types, "disallowed"), Token.Name.Builtin.RepeatType),
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(builtin_words(units, "mandatory"), Token.Number),
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(builtin_words(chord_modifiers, "disallowed"), Token.ChordModifier),
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(builtin_words(music_functions, "mandatory"), Token.Name.Builtin.MusicFunction),
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(builtin_words(dynamics, "mandatory"), Token.Name.Builtin.Dynamic),
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# Those like slurs that don't take a backslash are covered above.
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(builtin_words(articulations, "mandatory"), Token.Name.Builtin.Articulation),
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(builtin_words(music_commands, "mandatory"), Token.Name.Builtin.MusicCommand),
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(builtin_words(markup_commands, "mandatory"), Token.Name.Builtin.MarkupCommand),
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(builtin_words(grobs, "disallowed"), Token.Name.Builtin.Grob),
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(builtin_words(translators, "disallowed"), Token.Name.Builtin.Translator),
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# Optional backslash because of \layout { \context { \Score ... } }.
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(builtin_words(contexts, "optional"), Token.Name.Builtin.Context),
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(builtin_words(context_properties, "disallowed"), Token.Name.Builtin.ContextProperty),
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(builtin_words(grob_properties, "disallowed"),
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Token.Name.Builtin.GrobProperty,
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"maybe-subproperties"),
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# Optional backslashes here because output definitions are wrappers
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# around modules. Concretely, you can do, e.g.,
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# \paper { oddHeaderMarkup = \evenHeaderMarkup }
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(builtin_words(paper_variables, "optional"), Token.Name.Builtin.PaperVariable),
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(builtin_words(header_variables, "optional"), Token.Name.Builtin.HeaderVariable),
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# Other backslashed-escaped names (like dereferencing a
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# music variable), possibly with a direction specifier.
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(r"[\-_^]?\\.+?" + NAME_END_RE, Token.Name.BackslashReference),
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# Definition of a variable. Support assignments to alist keys
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# (myAlist.my-key.my-nested-key = \markup \spam \eggs).
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(r"""(?x)
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(?: [^\W\d] | - )+
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(?= (?: [^\W\d] | [\-.] )* \s* = )
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""", Token.Name.Lvalue),
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# Virtually everything can appear in markup mode, so we highlight
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# as text. Try to get a complete word, or we might wrongly lex
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# a suffix that happens to be a builtin as a builtin (e.g., "myStaff").
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(r"([^\W\d]|-)+?" + NAME_END_RE, Token.Text),
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(r".", Token.Text),
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],
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"string": [
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(r'"', Token.String, "#pop"),
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(r'\\.', Token.String.Escape),
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(r'[^\\"]+', Token.String),
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],
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"value": [
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# Scan a LilyPond value, then pop back since we had a
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# complete expression.
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(r"#\{", Token.Punctuation, ("#pop", "root")),
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inherit,
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],
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# Grob subproperties are undeclared and it would be tedious
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# to maintain them by hand. Instead, this state allows recognizing
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# everything that looks like a-known-property.foo.bar-baz as
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# one single property name.
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"maybe-subproperties": [
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(r"\s+", Token.Text.Whitespace),
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(r"(\.)((?:[^\W\d]|-)+?)" + NAME_END_RE,
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bygroups(Token.Punctuation, Token.Name.Builtin.GrobProperty)),
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default("#pop"),
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]
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}
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