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"""
pygments.lexers.lilypond
~~~~~~~~~~~~~~~~~~~~~~~~
Lexer for LilyPond.
:copyright: Copyright 2006-2024 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.
"""
name = 'LilyPond'
url = 'https://lilypond.org'
aliases = ['lilypond']
filenames = ['*.ly']
mimetypes = []
version_added = '2.11'
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"),
]
}
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