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+"""
+    pygments.lexers.codeql
+    ~~~~~~~~~~~~~~~~~~~~~~
+
+    Lexer for CodeQL query language.
+
+    The grammar is originating from:
+    https://github.com/github/vscode-codeql/blob/main/syntaxes/README.md
+
+    :copyright: Copyright 2006-present by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+__all__ = ['CodeQLLexer']
+
+import re
+
+from pygments.lexer import RegexLexer, words
+from pygments.token import Comment, Operator, Keyword, Name, String, \
+    Number, Punctuation, Whitespace
+
+class CodeQLLexer(RegexLexer):
+    name = 'CodeQL'
+    aliases = ['codeql', 'ql']
+    filenames = ['*.ql', '*.qll']
+    mimetypes = []
+    url = 'https://github.com/github/codeql'
+    version_added = '2.19'
+
+    flags = re.MULTILINE | re.UNICODE
+
+    tokens = {
+        'root': [
+            # Whitespace and comments
+            (r'\s+', Whitespace),
+            (r'//.*?\n', Comment.Single),
+            (r'/\*', Comment.Multiline, 'multiline-comments'),
+
+             # Keywords
+            (words((
+                'module', 'import', 'class', 'extends', 'implements',
+                'predicate', 'select', 'where', 'from', 'as', 'and', 'or', 'not',
+                'in', 'if', 'then', 'else', 'exists', 'forall', 'instanceof',
+                'private', 'predicate', 'abstract', 'cached', 'external',
+                'final', 'library', 'override', 'query'
+            ), suffix=r'\b'), Keyword.Builtin),
+
+            # Special Keywords
+            (words(('this'),                # class related keywords
+                   prefix=r'\b', suffix=r'\b\??:?'), Name.Builtin.Pseudo),
+
+            # Types
+            (words((
+                'boolean', 'date', 'float', 'int', 'string'
+            ), suffix=r'\b'), Keyword.Type),
+
+            # Literals
+            (r'"(\\\\|\\[^\\]|[^"\\])*"', String),
+            (r'[0-9]+\.[0-9]+', Number.Float),
+            (r'[0-9]+', Number.Integer),
+            
+            # Operators
+            (r'<=|>=|<|>|=|!=|\+|-|\*|/', Operator),
+
+            # Punctuation
+            (r'[.,;:\[\]{}()]+', Punctuation),
+
+            # Identifiers
+            (r'@[a-zA-Z_]\w*', Name.Variable),  # Variables with @ prefix
+            (r'[A-Z][a-zA-Z0-9_]*', Name.Class),  # Types and classes
+            (r'[a-z][a-zA-Z0-9_]*', Name.Variable),  # Variables and predicates
+        ],
+        'multiline-comments': [
+            (r'[^*/]+', Comment.Multiline),
+            (r'/\*', Comment.Multiline, '#push'),
+            (r'\*/', Comment.Multiline, '#pop'),
+            (r'[*/]', Comment.Multiline),
+        ],
+
+    }