1 files changed, 104 insertions, 0 deletions
diff --git a/venv/lib/python3.9/site-packages/pygments/lexers/yang.py b/venv/lib/python3.9/site-packages/pygments/lexers/yang.py
new file mode 100644
index 00000000..866c01d2
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+++ b/venv/lib/python3.9/site-packages/pygments/lexers/yang.py
@@ -0,0 +1,104 @@
+"""
+    pygments.lexers.yang
+    ~~~~~~~~~~~~~~~~~~~~
+
+    Lexer for the YANG 1.1 modeling language. See :rfc:`7950`.
+
+    :copyright: Copyright 2006-2023 by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+from pygments.lexer import RegexLexer, bygroups, words
+from pygments.token import Text, Token, Name, String, Comment, Number
+
+__all__ = ['YangLexer']
+
+
+class YangLexer(RegexLexer):
+    """
+    Lexer for YANG, based on RFC7950.
+
+    .. versionadded:: 2.7
+    """
+    name = 'YANG'
+    url = 'https://tools.ietf.org/html/rfc7950/'
+    aliases = ['yang']
+    filenames = ['*.yang']
+    mimetypes = ['application/yang']
+
+    #Keywords from RFC7950 ; oriented at BNF style
+    TOP_STMTS_KEYWORDS = ("module", "submodule")
+    MODULE_HEADER_STMT_KEYWORDS = ("belongs-to", "namespace", "prefix", "yang-version")
+    META_STMT_KEYWORDS = ("contact", "description", "organization",
+                          "reference", "revision")
+    LINKAGE_STMTS_KEYWORDS = ("import", "include", "revision-date")
+    BODY_STMT_KEYWORDS = ("action", "argument", "augment", "deviation",
+                          "extension", "feature", "grouping", "identity",
+                          "if-feature", "input", "notification", "output",
+                          "rpc", "typedef")
+    DATA_DEF_STMT_KEYWORDS = ("anydata", "anyxml", "case", "choice",
+                              "config", "container", "deviate", "leaf",
+                              "leaf-list", "list", "must", "presence",
+                              "refine", "uses", "when")
+    TYPE_STMT_KEYWORDS = ("base", "bit", "default", "enum", "error-app-tag",
+                          "error-message", "fraction-digits", "length",
+                          "max-elements", "min-elements", "modifier",
+                          "ordered-by", "path", "pattern", "position",
+                          "range", "require-instance", "status", "type",
+                          "units", "value", "yin-element")
+    LIST_STMT_KEYWORDS = ("key", "mandatory", "unique")
+
+    #RFC7950 other keywords
+    CONSTANTS_KEYWORDS = ("add", "current", "delete", "deprecated", "false",
+                          "invert-match", "max", "min", "not-supported",
+                          "obsolete", "replace", "true", "unbounded", "user")
+
+    #RFC7950 Built-In Types
+    TYPES = ("binary", "bits", "boolean", "decimal64", "empty", "enumeration",
+             "identityref", "instance-identifier", "int16", "int32", "int64",
+             "int8", "leafref", "string", "uint16", "uint32", "uint64",
+             "uint8", "union")
+
+    suffix_re_pattern = r'(?=[^\w\-:])'
+
+    tokens = {
+        'comments': [
+            (r'[^*/]', Comment),
+            (r'/\*', Comment, '#push'),
+            (r'\*/', Comment, '#pop'),
+            (r'[*/]', Comment),
+        ],
+        "root": [
+            (r'\s+', Text.Whitespace),
+            (r'[{};]+', Token.Punctuation),
+            (r'(?<![\-\w])(and|or|not|\+|\.)(?![\-\w])', Token.Operator),
+
+            (r'"(?:\\"|[^"])*?"', String.Double),
+            (r"'(?:\\'|[^'])*?'", String.Single),
+
+            (r'/\*', Comment, 'comments'),
+            (r'//.*?$', Comment),
+
+            #match BNF stmt for `node-identifier` with [ prefix ":"]
+            (r'(?:^|(?<=[\s{};]))([\w.-]+)(:)([\w.-]+)(?=[\s{};])',
+             bygroups(Name.Namespace, Token.Punctuation, Name.Variable)),
+
+            #match BNF stmt `date-arg-str`
+            (r'([0-9]{4}\-[0-9]{2}\-[0-9]{2})(?=[\s{};])', Name.Label),
+            (r'([0-9]+\.[0-9]+)(?=[\s{};])', Number.Float),
+            (r'([0-9]+)(?=[\s{};])', Number.Integer),
+
+            (words(TOP_STMTS_KEYWORDS, suffix=suffix_re_pattern), Token.Keyword),
+            (words(MODULE_HEADER_STMT_KEYWORDS, suffix=suffix_re_pattern), Token.Keyword),
+            (words(META_STMT_KEYWORDS, suffix=suffix_re_pattern), Token.Keyword),
+            (words(LINKAGE_STMTS_KEYWORDS, suffix=suffix_re_pattern), Token.Keyword),
+            (words(BODY_STMT_KEYWORDS, suffix=suffix_re_pattern), Token.Keyword),
+            (words(DATA_DEF_STMT_KEYWORDS, suffix=suffix_re_pattern), Token.Keyword),
+            (words(TYPE_STMT_KEYWORDS, suffix=suffix_re_pattern), Token.Keyword),
+            (words(LIST_STMT_KEYWORDS, suffix=suffix_re_pattern), Token.Keyword),
+            (words(TYPES, suffix=suffix_re_pattern), Name.Class),
+            (words(CONSTANTS_KEYWORDS, suffix=suffix_re_pattern), Name.Class),
+
+            (r'[^;{}\s\'"]+', Name.Variable),
+        ]
+    }