104 lines
4.4 KiB
Python
104 lines
4.4 KiB
Python
"""
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pygments.lexers.yang
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~~~~~~~~~~~~~~~~~~~~
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Lexer for the YANG 1.1 modeling language. See :rfc:`7950`.
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:copyright: Copyright 2006-2025 by the Pygments team, see AUTHORS.
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:license: BSD, see LICENSE for details.
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"""
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from pygments.lexer import RegexLexer, bygroups, words
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from pygments.token import Text, Token, Name, String, Comment, Number
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__all__ = ['YangLexer']
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class YangLexer(RegexLexer):
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"""
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Lexer for YANG, based on RFC7950.
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"""
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name = 'YANG'
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url = 'https://tools.ietf.org/html/rfc7950/'
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aliases = ['yang']
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filenames = ['*.yang']
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mimetypes = ['application/yang']
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version_added = '2.7'
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#Keywords from RFC7950 ; oriented at BNF style
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TOP_STMTS_KEYWORDS = ("module", "submodule")
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MODULE_HEADER_STMT_KEYWORDS = ("belongs-to", "namespace", "prefix", "yang-version")
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META_STMT_KEYWORDS = ("contact", "description", "organization",
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"reference", "revision")
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LINKAGE_STMTS_KEYWORDS = ("import", "include", "revision-date")
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BODY_STMT_KEYWORDS = ("action", "argument", "augment", "deviation",
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"extension", "feature", "grouping", "identity",
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"if-feature", "input", "notification", "output",
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"rpc", "typedef")
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DATA_DEF_STMT_KEYWORDS = ("anydata", "anyxml", "case", "choice",
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"config", "container", "deviate", "leaf",
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"leaf-list", "list", "must", "presence",
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"refine", "uses", "when")
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TYPE_STMT_KEYWORDS = ("base", "bit", "default", "enum", "error-app-tag",
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"error-message", "fraction-digits", "length",
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"max-elements", "min-elements", "modifier",
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"ordered-by", "path", "pattern", "position",
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"range", "require-instance", "status", "type",
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"units", "value", "yin-element")
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LIST_STMT_KEYWORDS = ("key", "mandatory", "unique")
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#RFC7950 other keywords
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CONSTANTS_KEYWORDS = ("add", "current", "delete", "deprecated", "false",
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"invert-match", "max", "min", "not-supported",
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"obsolete", "replace", "true", "unbounded", "user")
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#RFC7950 Built-In Types
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TYPES = ("binary", "bits", "boolean", "decimal64", "empty", "enumeration",
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"identityref", "instance-identifier", "int16", "int32", "int64",
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"int8", "leafref", "string", "uint16", "uint32", "uint64",
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"uint8", "union")
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suffix_re_pattern = r'(?=[^\w\-:])'
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tokens = {
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'comments': [
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(r'[^*/]', Comment),
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(r'/\*', Comment, '#push'),
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(r'\*/', Comment, '#pop'),
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(r'[*/]', Comment),
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],
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"root": [
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(r'\s+', Text.Whitespace),
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(r'[{};]+', Token.Punctuation),
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(r'(?<![\-\w])(and|or|not|\+|\.)(?![\-\w])', Token.Operator),
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(r'"(?:\\"|[^"])*?"', String.Double),
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(r"'(?:\\'|[^'])*?'", String.Single),
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(r'/\*', Comment, 'comments'),
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(r'//.*?$', Comment),
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#match BNF stmt for `node-identifier` with [ prefix ":"]
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(r'(?:^|(?<=[\s{};]))([\w.-]+)(:)([\w.-]+)(?=[\s{};])',
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bygroups(Name.Namespace, Token.Punctuation, Name.Variable)),
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#match BNF stmt `date-arg-str`
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(r'([0-9]{4}\-[0-9]{2}\-[0-9]{2})(?=[\s{};])', Name.Label),
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(r'([0-9]+\.[0-9]+)(?=[\s{};])', Number.Float),
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(r'([0-9]+)(?=[\s{};])', Number.Integer),
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(words(TOP_STMTS_KEYWORDS, suffix=suffix_re_pattern), Token.Keyword),
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(words(MODULE_HEADER_STMT_KEYWORDS, suffix=suffix_re_pattern), Token.Keyword),
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(words(META_STMT_KEYWORDS, suffix=suffix_re_pattern), Token.Keyword),
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(words(LINKAGE_STMTS_KEYWORDS, suffix=suffix_re_pattern), Token.Keyword),
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(words(BODY_STMT_KEYWORDS, suffix=suffix_re_pattern), Token.Keyword),
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(words(DATA_DEF_STMT_KEYWORDS, suffix=suffix_re_pattern), Token.Keyword),
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(words(TYPE_STMT_KEYWORDS, suffix=suffix_re_pattern), Token.Keyword),
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(words(LIST_STMT_KEYWORDS, suffix=suffix_re_pattern), Token.Keyword),
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(words(TYPES, suffix=suffix_re_pattern), Name.Class),
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(words(CONSTANTS_KEYWORDS, suffix=suffix_re_pattern), Name.Class),
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(r'[^;{}\s\'"]+', Name.Variable),
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]
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}
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