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""" pygments.lexers.lilypond ~~~~~~~~~~~~~~~~~~~~~~~~ Lexer for LilyPond. :copyright: Copyright 2006-2022 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"), ] }