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"""
pygments.lexers.cddl
~~~~~~~~~~~~~~~~~~~~
Lexer for the Concise data definition language (CDDL), a notational
convention to express CBOR and JSON data structures.
More information:
https://datatracker.ietf.org/doc/rfc8610/
:copyright: Copyright 2006-2021 by the Pygments team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
import re
__all__ = ['CddlLexer']
from pygments.lexer import RegexLexer, bygroups, include, words
from pygments.token import (
Comment,
Error,
Keyword,
Name,
Number,
Operator,
Punctuation,
String,
Text,
Whitespace,
)
class CddlLexer(RegexLexer):
"""
Lexer for CDDL definitions.
.. versionadded:: 2.8
"""
name = "CDDL"
aliases = ["cddl"]
filenames = ["*.cddl"]
mimetypes = ["text/x-cddl"]
_prelude_types = [
"any",
"b64legacy",
"b64url",
"bigfloat",
"bigint",
"bignint",
"biguint",
"bool",
"bstr",
"bytes",
"cbor-any",
"decfrac",
"eb16",
"eb64legacy",
"eb64url",
"encoded-cbor",
"false",
"float",
"float16",
"float16-32",
"float32",
"float32-64",
"float64",
"int",
"integer",
"mime-message",
"nil",
"nint",
"null",
"number",
"regexp",
"tdate",
"text",
"time",
"true",
"tstr",
"uint",
"undefined",
"unsigned",
"uri",
]
_controls = [
".and",
".bits",
".cbor",
".cborseq",
".default",
".eq",
".ge",
".gt",
".le",
".lt",
".ne",
".regexp",
".size",
".within",
]
_re_id = (
r"[$@A-Z_a-z]"
r"(?:[\-\.]+(?=[$@0-9A-Z_a-z])|[$@0-9A-Z_a-z])*"
)
# While the spec reads more like "an int must not start with 0" we use a
# lookahead here that says "after a 0 there must be no digit". This makes the
# '0' the invalid character in '01', which looks nicer when highlighted.
_re_uint = r"(?:0b[01]+|0x[0-9a-fA-F]+|[1-9]\d*|0(?!\d))"
_re_int = r"-?" + _re_uint
flags = re.UNICODE | re.MULTILINE
tokens = {
"commentsandwhitespace": [(r"\s+", Whitespace), (r";.+$", Comment.Single)],
"root": [
include("commentsandwhitespace"),
# tag types
(r"#(\d\.{uint})?".format(uint=_re_uint), Keyword.Type), # type or any
# occurence
(
r"({uint})?(\*)({uint})?".format(uint=_re_uint),
bygroups(Number, Operator, Number),
),
(r"\?|\+", Operator), # occurrence
(r"\^", Operator), # cuts
(r"(\.\.\.|\.\.)", Operator), # rangeop
(words(_controls, suffix=r"\b"), Operator.Word), # ctlops
# into choice op
(r"&(?=\s*({groupname}|\())".format(groupname=_re_id), Operator),
(r"~(?=\s*{})".format(_re_id), Operator), # unwrap op
(r"//|/(?!/)", Operator), # double und single slash
(r"=>|/==|/=|=", Operator),
(r"[\[\]{}\(\),<>:]", Punctuation),
# Bytestrings
(r"(b64)(')", bygroups(String.Affix, String.Single), "bstrb64url"),
(r"(h)(')", bygroups(String.Affix, String.Single), "bstrh"),
(r"'", String.Single, "bstr"),
# Barewords as member keys (must be matched before values, types, typenames,
# groupnames).
# Token type is String as barewords are always interpreted as such.
(
r"({bareword})(\s*)(:)".format(bareword=_re_id),
bygroups(String, Whitespace, Punctuation),
),
# predefined types
(
words(_prelude_types, prefix=r"(?![\-_$@])\b", suffix=r"\b(?![\-_$@])"),
Name.Builtin,
),
# user-defined groupnames, typenames
(_re_id, Name.Class),
# values
(r"0b[01]+", Number.Bin),
(r"0o[0-7]+", Number.Oct),
(r"0x[0-9a-fA-F]+(\.[0-9a-fA-F]+)?p[+-]?\d+", Number.Hex), # hexfloat
(r"0x[0-9a-fA-F]+", Number.Hex), # hex
# Float
(
r"{int}(?=(\.\d|e[+-]?\d))(?:\.\d+)?(?:e[+-]?\d+)?".format(int=_re_int),
Number.Float,
),
# Int
(_re_int, Number.Integer),
(r'"(\\\\|\\"|[^"])*"', String.Double),
],
"bstrb64url": [
(r"'", String.Single, "#pop"),
include("commentsandwhitespace"),
(r"\\.", String.Escape),
(r"[0-9a-zA-Z\-_=]+", String.Single),
(r".", Error),
# (r";.+$", Token.Other),
],
"bstrh": [
(r"'", String.Single, "#pop"),
include("commentsandwhitespace"),
(r"\\.", String.Escape),
(r"[0-9a-fA-F]+", String.Single),
(r".", Error),
],
"bstr": [
(r"'", String.Single, "#pop"),
(r"\\.", String.Escape),
(r"[^'\\]+", String.Single),
],
}
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