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"""
pygments.lexers.asn1
~~~~~~~~~~~~~~~~~~~~
Pygments lexers for ASN.1.
:copyright: Copyright 2006-2025 by the Pygments team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
import re
from pygments.token import Comment, Operator, Keyword, Name, String, \
Number, Punctuation, Whitespace
from pygments.lexer import RegexLexer, words, bygroups
__all__ = ['Asn1Lexer']
SINGLE_WORD_KEYWORDS = [
"ENCODED",
"ABSTRACT-SYNTAX",
"END",
"APPLICATION",
"EXPLICIT",
"IMPLICIT",
"AUTOMATIC",
"TAGS",
"BEGIN",
"EXTENSIBILITY",
"BY",
"FROM",
"COMPONENT",
"UNIVERSAL",
"COMPONENTS",
"CONSTRAINED",
"IMPLIED",
"DEFINITIONS",
"INCLUDES",
"PRIVATE",
"WITH",
"OF",
]
OPERATOR_WORDS = [
"EXCEPT",
"UNION",
"INTERSECTION",
]
SINGLE_WORD_NAMESPACE_KEYWORDS = [
"EXPORTS",
"IMPORTS",
]
MULTI_WORDS_DECLARATIONS = [
"SEQUENCE OF",
"SET OF",
"INSTANCE OF",
"WITH SYNTAX",
]
SINGLE_WORDS_DECLARATIONS = [
"SIZE",
"SEQUENCE",
"SET",
"CLASS",
"UNIQUE",
"DEFAULT",
"CHOICE",
"PATTERN",
"OPTIONAL",
"PRESENT",
"ABSENT",
"CONTAINING",
"ENUMERATED",
"ALL",
]
TWO_WORDS_TYPES = [
"OBJECT IDENTIFIER",
"BIT STRING",
"OCTET STRING",
"CHARACTER STRING",
"EMBEDDED PDV",
]
SINGLE_WORD_TYPES = [
"RELATIVE-OID",
"TYPE-IDENTIFIER",
"ObjectDescriptor",
"IA5String",
"INTEGER",
"ISO646String",
"T61String",
"BMPString",
"NumericString",
"TeletexString",
"GeneralizedTime",
"REAL",
"BOOLEAN",
"GeneralString",
"GraphicString",
"UniversalString",
"UTCTime",
"VisibleString",
"UTF8String",
"PrintableString",
"VideotexString",
"EXTERNAL",
]
def word_sequences(tokens):
return "(" + '|'.join(token.replace(' ', r'\s+') for token in tokens) + r')\b'
class Asn1Lexer(RegexLexer):
"""
Lexer for ASN.1 module definition
"""
flags = re.MULTILINE
name = 'ASN.1'
aliases = ['asn1']
filenames = ["*.asn1"]
url = "https://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf"
version_added = '2.16'
tokens = {
'root': [
# Whitespace:
(r'\s+', Whitespace),
# Comments:
(r'--.*$', Comment.Single),
(r'/\*', Comment.Multiline, 'comment'),
# Numbers:
(r'\d+\.\d*([eE][-+]?\d+)?', Number.Float),
(r'\d+', Number.Integer),
# Identifier:
(r"&?[a-z][-a-zA-Z0-9]*[a-zA-Z0-9]\b", Name.Variable),
# Constants:
(words(("TRUE", "FALSE", "NULL", "MINUS-INFINITY", "PLUS-INFINITY", "MIN", "MAX"), suffix=r'\b'), Keyword.Constant),
# Builtin types:
(word_sequences(TWO_WORDS_TYPES), Keyword.Type),
(words(SINGLE_WORD_TYPES, suffix=r'\b'), Keyword.Type),
# Other keywords:
(r"EXPORTS\s+ALL\b", Keyword.Namespace),
(words(SINGLE_WORD_NAMESPACE_KEYWORDS, suffix=r'\b'), Operator.Namespace),
(word_sequences(MULTI_WORDS_DECLARATIONS), Keyword.Declaration),
(words(SINGLE_WORDS_DECLARATIONS, suffix=r'\b'), Keyword.Declaration),
(words(OPERATOR_WORDS, suffix=r'\b'), Operator.Word),
(words(SINGLE_WORD_KEYWORDS), Keyword),
# Type identifier:
(r"&?[A-Z][-a-zA-Z0-9]*[a-zA-Z0-9]\b", Name.Type),
# Operators:
(r"(::=|\.\.\.|\.\.|\[\[|\]\]|\||\^)", Operator),
# Punctuation:
(r"(\.|,|\{|\}|\(|\)|\[|\])", Punctuation),
# String:
(r'"', String, 'string'),
# Binary string:
(r"('[01 ]*')(B)\b", bygroups(String, String.Affix)),
(r"('[0-9A-F ]*')(H)\b",bygroups(String, String.Affix)),
],
'comment': [
(r'[^*/]+', Comment.Multiline),
(r'/\*', Comment.Multiline, '#push'),
(r'\*/', Comment.Multiline, '#pop'),
(r'[*/]', Comment.Multiline)
],
'string': [
(r'""', String),
(r'"', String, "#pop"),
(r'[^"]', String),
]
}
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