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+"""
+    pygments.lexers.whiley
+    ~~~~~~~~~~~~~~~~~~~~~~
+
+    Lexers for the Whiley language.
+
+    :copyright: Copyright 2006-present by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+from pygments.lexer import RegexLexer, bygroups, words
+from pygments.token import Comment, Keyword, Name, Number, Operator, \
+    Punctuation, String, Text
+
+__all__ = ['WhileyLexer']
+
+
+class WhileyLexer(RegexLexer):
+    """
+    Lexer for the Whiley programming language.
+    """
+    name = 'Whiley'
+    url = 'http://whiley.org/'
+    filenames = ['*.whiley']
+    aliases = ['whiley']
+    mimetypes = ['text/x-whiley']
+    version_added = '2.2'
+
+    # See the language specification:
+    # http://whiley.org/download/WhileyLanguageSpec.pdf
+
+    tokens = {
+        'root': [
+            # Whitespace
+            (r'\s+', Text),
+
+            # Comments
+            (r'//.*', Comment.Single),
+            # don't parse empty comment as doc comment
+            (r'/\*\*/', Comment.Multiline),
+            (r'(?s)/\*\*.*?\*/', String.Doc),
+            (r'(?s)/\*.*?\*/', Comment.Multiline),
+
+            # Keywords
+            (words((
+                'if', 'else', 'while', 'for', 'do', 'return',
+                'switch', 'case', 'default', 'break', 'continue',
+                'requires', 'ensures', 'where', 'assert', 'assume',
+                'all', 'no', 'some', 'in', 'is', 'new',
+                'throw', 'try', 'catch', 'debug', 'skip', 'fail',
+                'finite', 'total'), suffix=r'\b'), Keyword.Reserved),
+            (words((
+                'function', 'method', 'public', 'private', 'protected',
+                'export', 'native'), suffix=r'\b'), Keyword.Declaration),
+            # "constant" & "type" are not keywords unless used in declarations
+            (r'(constant|type)(\s+)([a-zA-Z_]\w*)(\s+)(is)\b',
+             bygroups(Keyword.Declaration, Text, Name, Text, Keyword.Reserved)),
+            (r'(true|false|null)\b', Keyword.Constant),
+            (r'(bool|byte|int|real|any|void)\b', Keyword.Type),
+            # "from" is not a keyword unless used with import
+            (r'(import)(\s+)(\*)([^\S\n]+)(from)\b',
+             bygroups(Keyword.Namespace, Text, Punctuation, Text, Keyword.Namespace)),
+            (r'(import)(\s+)([a-zA-Z_]\w*)([^\S\n]+)(from)\b',
+             bygroups(Keyword.Namespace, Text, Name, Text, Keyword.Namespace)),
+            (r'(package|import)\b', Keyword.Namespace),
+
+            # standard library: https://github.com/Whiley/WhileyLibs/
+            (words((
+                # types defined in whiley.lang.Int
+                'i8', 'i16', 'i32', 'i64',
+                'u8', 'u16', 'u32', 'u64',
+                'uint', 'nat',
+
+                # whiley.lang.Any
+                'toString'), suffix=r'\b'), Name.Builtin),
+
+            # byte literal
+            (r'[01]+b', Number.Bin),
+
+            # decimal literal
+            (r'[0-9]+\.[0-9]+', Number.Float),
+            # match "1." but not ranges like "3..5"
+            (r'[0-9]+\.(?!\.)', Number.Float),
+
+            # integer literal
+            (r'0x[0-9a-fA-F]+', Number.Hex),
+            (r'[0-9]+', Number.Integer),
+
+            # character literal
+            (r"""'[^\\]'""", String.Char),
+            (r"""(')(\\['"\\btnfr])(')""",
+             bygroups(String.Char, String.Escape, String.Char)),
+
+            # string literal
+            (r'"', String, 'string'),
+
+            # operators and punctuation
+            (r'[{}()\[\],.;]', Punctuation),
+            (r'[+\-*/%&|<>^!~@=:?'
+             # unicode operators
+             r'\u2200\u2203\u2205\u2282\u2286\u2283\u2287'
+             r'\u222A\u2229\u2264\u2265\u2208\u2227\u2228'
+             r']', Operator),
+
+            # identifier
+            (r'[a-zA-Z_]\w*', Name),
+        ],
+        'string': [
+            (r'"', String, '#pop'),
+            (r'\\[btnfr]', String.Escape),
+            (r'\\u[0-9a-fA-F]{4}', String.Escape),
+            (r'\\.', String),
+            (r'[^\\"]+', String),
+        ],
+    }