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"""
pygments.lexers.usd
~~~~~~~~~~~~~~~~~~~
The module that parses Pixar's Universal Scene Description file format.
:copyright: Copyright 2006-2025 by the Pygments team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
from pygments.lexer import RegexLexer, bygroups
from pygments.lexer import words as words_
from pygments.lexers._usd_builtins import COMMON_ATTRIBUTES, KEYWORDS, \
OPERATORS, SPECIAL_NAMES, TYPES
from pygments.token import Comment, Keyword, Name, Number, Operator, \
Punctuation, String, Text, Whitespace
__all__ = ["UsdLexer"]
def _keywords(words, type_):
return [(words_(words, prefix=r"\b", suffix=r"\b"), type_)]
_TYPE = r"(\w+(?:\[\])?)"
_BASE_ATTRIBUTE = r"(\w+(?:\:\w+)*)(?:(\.)(timeSamples))?"
_WHITESPACE = r"([ \t]+)"
class UsdLexer(RegexLexer):
"""
A lexer that parses Pixar's Universal Scene Description file format.
"""
name = "USD"
url = 'https://graphics.pixar.com/usd/release/index.html'
aliases = ["usd", "usda"]
filenames = ["*.usd", "*.usda"]
version_added = '2.6'
tokens = {
"root": [
(rf"(custom){_WHITESPACE}(uniform)(\s+){_TYPE}(\s+){_BASE_ATTRIBUTE}(\s*)(=)",
bygroups(Keyword.Token, Whitespace, Keyword.Token, Whitespace,
Keyword.Type, Whitespace, Name.Attribute, Text,
Name.Keyword.Tokens, Whitespace, Operator)),
(rf"(custom){_WHITESPACE}{_TYPE}(\s+){_BASE_ATTRIBUTE}(\s*)(=)",
bygroups(Keyword.Token, Whitespace, Keyword.Type, Whitespace,
Name.Attribute, Text, Name.Keyword.Tokens, Whitespace,
Operator)),
(rf"(uniform){_WHITESPACE}{_TYPE}(\s+){_BASE_ATTRIBUTE}(\s*)(=)",
bygroups(Keyword.Token, Whitespace, Keyword.Type, Whitespace,
Name.Attribute, Text, Name.Keyword.Tokens, Whitespace,
Operator)),
(rf"{_TYPE}{_WHITESPACE}{_BASE_ATTRIBUTE}(\s*)(=)",
bygroups(Keyword.Type, Whitespace, Name.Attribute, Text,
Name.Keyword.Tokens, Whitespace, Operator)),
] +
_keywords(KEYWORDS, Keyword.Tokens) +
_keywords(SPECIAL_NAMES, Name.Builtins) +
_keywords(COMMON_ATTRIBUTES, Name.Attribute) +
[(r"\b\w+:[\w:]+\b", Name.Attribute)] +
_keywords(OPERATORS, Operator) + # more attributes
[(type_ + r"\[\]", Keyword.Type) for type_ in TYPES] +
_keywords(TYPES, Keyword.Type) +
[
(r"[(){}\[\]]", Punctuation),
("#.*?$", Comment.Single),
(",", Punctuation),
(";", Punctuation), # ";"s are allowed to combine separate metadata lines
("=", Operator),
(r"[-]*([0-9]*[.])?[0-9]+(?:e[+-]*\d+)?", Number),
(r"'''(?:.|\n)*?'''", String),
(r'"""(?:.|\n)*?"""', String),
(r"'.*?'", String),
(r'".*?"', String),
(r"<(\.\./)*([\w/]+|[\w/]+\.\w+[\w:]*)>", Name.Namespace),
(r"@.*?@", String.Interpol),
(r'\(.*"[.\\n]*".*\)', String.Doc),
(r"\A#usda .+$", Comment.Hashbang),
(r"\s+", Whitespace),
(r"\w+", Text),
(r"[_:.]+", Punctuation),
],
}