Uploaded Test files

venv/Lib/site-packages/pygments/lexers/haskell.py

@@ -0,0 +1,870 @@
+# -*- coding: utf-8 -*-
+"""
+    pygments.lexers.haskell
+    ~~~~~~~~~~~~~~~~~~~~~~~
+
+    Lexers for Haskell and related languages.
+
+    :copyright: Copyright 2006-2020 by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+import re
+
+from pygments.lexer import Lexer, RegexLexer, bygroups, do_insertions, \
+    default, include, inherit
+from pygments.token import Text, Comment, Operator, Keyword, Name, String, \
+    Number, Punctuation, Generic
+from pygments import unistring as uni
+
+__all__ = ['HaskellLexer', 'HspecLexer', 'IdrisLexer', 'AgdaLexer', 'CryptolLexer',
+           'LiterateHaskellLexer', 'LiterateIdrisLexer', 'LiterateAgdaLexer',
+           'LiterateCryptolLexer', 'KokaLexer']
+
+
+line_re = re.compile('.*?\n')
+
+
+class HaskellLexer(RegexLexer):
+    """
+    A Haskell lexer based on the lexemes defined in the Haskell 98 Report.
+
+    .. versionadded:: 0.8
+    """
+    name = 'Haskell'
+    aliases = ['haskell', 'hs']
+    filenames = ['*.hs']
+    mimetypes = ['text/x-haskell']
+
+    flags = re.MULTILINE | re.UNICODE
+
+    reserved = ('case', 'class', 'data', 'default', 'deriving', 'do', 'else',
+                'family', 'if', 'in', 'infix[lr]?', 'instance',
+                'let', 'newtype', 'of', 'then', 'type', 'where', '_')
+    ascii = ('NUL', 'SOH', '[SE]TX', 'EOT', 'ENQ', 'ACK',
+             'BEL', 'BS', 'HT', 'LF', 'VT', 'FF', 'CR', 'S[OI]', 'DLE',
+             'DC[1-4]', 'NAK', 'SYN', 'ETB', 'CAN',
+             'EM', 'SUB', 'ESC', '[FGRU]S', 'SP', 'DEL')
+
+    tokens = {
+        'root': [
+            # Whitespace:
+            (r'\s+', Text),
+            # (r'--\s*|.*$', Comment.Doc),
+            (r'--(?![!#$%&*+./<=>?@^|_~:\\]).*?$', Comment.Single),
+            (r'\{-', Comment.Multiline, 'comment'),
+            # Lexemes:
+            #  Identifiers
+            (r'\bimport\b', Keyword.Reserved, 'import'),
+            (r'\bmodule\b', Keyword.Reserved, 'module'),
+            (r'\berror\b', Name.Exception),
+            (r'\b(%s)(?!\')\b' % '|'.join(reserved), Keyword.Reserved),
+            (r"'[^\\]'", String.Char),  # this has to come before the TH quote
+            (r'^[_' + uni.Ll + r'][\w\']*', Name.Function),
+            (r"'?[_" + uni.Ll + r"][\w']*", Name),
+            (r"('')?[" + uni.Lu + r"][\w\']*", Keyword.Type),
+            (r"(')[" + uni.Lu + r"][\w\']*", Keyword.Type),
+            (r"(')\[[^\]]*\]", Keyword.Type),  # tuples and lists get special treatment in GHC
+            (r"(')\([^)]*\)", Keyword.Type),  # ..
+            (r"(')[:!#$%&*+.\\/<=>?@^|~-]+", Keyword.Type),  # promoted type operators
+            #  Operators
+            (r'\\(?![:!#$%&*+.\\/<=>?@^|~-]+)', Name.Function),  # lambda operator
+            (r'(<-|::|->|=>|=)(?![:!#$%&*+.\\/<=>?@^|~-]+)', Operator.Word),  # specials
+            (r':[:!#$%&*+.\\/<=>?@^|~-]*', Keyword.Type),  # Constructor operators
+            (r'[:!#$%&*+.\\/<=>?@^|~-]+', Operator),  # Other operators
+            #  Numbers
+            (r'0[xX]_*[\da-fA-F](_*[\da-fA-F])*_*[pP][+-]?\d(_*\d)*', Number.Float),
+            (r'0[xX]_*[\da-fA-F](_*[\da-fA-F])*\.[\da-fA-F](_*[\da-fA-F])*'
+             r'(_*[pP][+-]?\d(_*\d)*)?', Number.Float),
+            (r'\d(_*\d)*_*[eE][+-]?\d(_*\d)*', Number.Float),
+            (r'\d(_*\d)*\.\d(_*\d)*(_*[eE][+-]?\d(_*\d)*)?', Number.Float),
+            (r'0[bB]_*[01](_*[01])*', Number.Bin),
+            (r'0[oO]_*[0-7](_*[0-7])*', Number.Oct),
+            (r'0[xX]_*[\da-fA-F](_*[\da-fA-F])*', Number.Hex),
+            (r'\d(_*\d)*', Number.Integer),
+            #  Character/String Literals
+            (r"'", String.Char, 'character'),
+            (r'"', String, 'string'),
+            #  Special
+            (r'\[\]', Keyword.Type),
+            (r'\(\)', Name.Builtin),
+            (r'[][(),;`{}]', Punctuation),
+        ],
+        'import': [
+            # Import statements
+            (r'\s+', Text),
+            (r'"', String, 'string'),
+            # after "funclist" state
+            (r'\)', Punctuation, '#pop'),
+            (r'qualified\b', Keyword),
+            # import X as Y
+            (r'([' + uni.Lu + r'][\w.]*)(\s+)(as)(\s+)([' + uni.Lu + r'][\w.]*)',
+             bygroups(Name.Namespace, Text, Keyword, Text, Name), '#pop'),
+            # import X hiding (functions)
+            (r'([' + uni.Lu + r'][\w.]*)(\s+)(hiding)(\s+)(\()',
+             bygroups(Name.Namespace, Text, Keyword, Text, Punctuation), 'funclist'),
+            # import X (functions)
+            (r'([' + uni.Lu + r'][\w.]*)(\s+)(\()',
+             bygroups(Name.Namespace, Text, Punctuation), 'funclist'),
+            # import X
+            (r'[\w.]+', Name.Namespace, '#pop'),
+        ],
+        'module': [
+            (r'\s+', Text),
+            (r'([' + uni.Lu + r'][\w.]*)(\s+)(\()',
+             bygroups(Name.Namespace, Text, Punctuation), 'funclist'),
+            (r'[' + uni.Lu + r'][\w.]*', Name.Namespace, '#pop'),
+        ],
+        'funclist': [
+            (r'\s+', Text),
+            (r'[' + uni.Lu + r']\w*', Keyword.Type),
+            (r'(_[\w\']+|[' + uni.Ll + r'][\w\']*)', Name.Function),
+            (r'--(?![!#$%&*+./<=>?@^|_~:\\]).*?$', Comment.Single),
+            (r'\{-', Comment.Multiline, 'comment'),
+            (r',', Punctuation),
+            (r'[:!#$%&*+.\\/<=>?@^|~-]+', Operator),
+            # (HACK, but it makes sense to push two instances, believe me)
+            (r'\(', Punctuation, ('funclist', 'funclist')),
+            (r'\)', Punctuation, '#pop:2'),
+        ],
+        # NOTE: the next four states are shared in the AgdaLexer; make sure
+        # any change is compatible with Agda as well or copy over and change
+        'comment': [
+            # Multiline Comments
+            (r'[^-{}]+', Comment.Multiline),
+            (r'\{-', Comment.Multiline, '#push'),
+            (r'-\}', Comment.Multiline, '#pop'),
+            (r'[-{}]', Comment.Multiline),
+        ],
+        'character': [
+            # Allows multi-chars, incorrectly.
+            (r"[^\\']'", String.Char, '#pop'),
+            (r"\\", String.Escape, 'escape'),
+            ("'", String.Char, '#pop'),
+        ],
+        'string': [
+            (r'[^\\"]+', String),
+            (r"\\", String.Escape, 'escape'),
+            ('"', String, '#pop'),
+        ],
+        'escape': [
+            (r'[abfnrtv"\'&\\]', String.Escape, '#pop'),
+            (r'\^[][' + uni.Lu + r'@^_]', String.Escape, '#pop'),
+            ('|'.join(ascii), String.Escape, '#pop'),
+            (r'o[0-7]+', String.Escape, '#pop'),
+            (r'x[\da-fA-F]+', String.Escape, '#pop'),
+            (r'\d+', String.Escape, '#pop'),
+            (r'\s+\\', String.Escape, '#pop'),
+        ],
+    }
+
+
+class HspecLexer(HaskellLexer):
+    """
+    A Haskell lexer with support for Hspec constructs.
+
+    .. versionadded:: 2.4.0
+    """
+
+    name = 'Hspec'
+    aliases = ['hspec']
+    filenames = []
+    mimetypes = []
+
+    tokens = {
+        'root': [
+            (r'(it\s*)("[^"]*")', bygroups(Text, String.Doc)),
+            (r'(describe\s*)("[^"]*")', bygroups(Text, String.Doc)),
+            (r'(context\s*)("[^"]*")', bygroups(Text, String.Doc)),
+            inherit,
+        ],
+    }
+
+
+class IdrisLexer(RegexLexer):
+    """
+    A lexer for the dependently typed programming language Idris.
+
+    Based on the Haskell and Agda Lexer.
+
+    .. versionadded:: 2.0
+    """
+    name = 'Idris'
+    aliases = ['idris', 'idr']
+    filenames = ['*.idr']
+    mimetypes = ['text/x-idris']
+
+    reserved = ('case', 'class', 'data', 'default', 'using', 'do', 'else',
+                'if', 'in', 'infix[lr]?', 'instance', 'rewrite', 'auto',
+                'namespace', 'codata', 'mutual', 'private', 'public', 'abstract',
+                'total', 'partial',
+                'interface', 'implementation', 'export', 'covering', 'constructor',
+                'let', 'proof', 'of', 'then', 'static', 'where', '_', 'with',
+                'pattern',  'term',  'syntax', 'prefix',
+                'postulate', 'parameters', 'record', 'dsl', 'impossible', 'implicit',
+                'tactics', 'intros', 'intro', 'compute', 'refine', 'exact', 'trivial')
+
+    ascii = ('NUL', 'SOH', '[SE]TX', 'EOT', 'ENQ', 'ACK',
+             'BEL', 'BS', 'HT', 'LF', 'VT', 'FF', 'CR', 'S[OI]', 'DLE',
+             'DC[1-4]', 'NAK', 'SYN', 'ETB', 'CAN',
+             'EM', 'SUB', 'ESC', '[FGRU]S', 'SP', 'DEL')
+
+    directives = ('lib', 'link', 'flag', 'include', 'hide', 'freeze', 'access',
+                  'default', 'logging', 'dynamic', 'name', 'error_handlers', 'language')
+
+    tokens = {
+        'root': [
+            # Comments
+            (r'^(\s*)(%%(%s))' % '|'.join(directives),
+             bygroups(Text, Keyword.Reserved)),
+            (r'(\s*)(--(?![!#$%&*+./<=>?@^|_~:\\]).*?)$', bygroups(Text, Comment.Single)),
+            (r'(\s*)(\|{3}.*?)$', bygroups(Text, Comment.Single)),
+            (r'(\s*)(\{-)', bygroups(Text, Comment.Multiline), 'comment'),
+            # Declaration
+            (r'^(\s*)([^\s(){}]+)(\s*)(:)(\s*)',
+             bygroups(Text, Name.Function, Text, Operator.Word, Text)),
+            #  Identifiers
+            (r'\b(%s)(?!\')\b' % '|'.join(reserved), Keyword.Reserved),
+            (r'(import|module)(\s+)', bygroups(Keyword.Reserved, Text), 'module'),
+            (r"('')?[A-Z][\w\']*", Keyword.Type),
+            (r'[a-z][\w\']*', Text),
+            #  Special Symbols
+            (r'(<-|::|->|=>|=)', Operator.Word),  # specials
+            (r'([(){}\[\]:!#$%&*+.\\/<=>?@^|~-]+)', Operator.Word),  # specials
+            #  Numbers
+            (r'\d+[eE][+-]?\d+', Number.Float),
+            (r'\d+\.\d+([eE][+-]?\d+)?', Number.Float),
+            (r'0[xX][\da-fA-F]+', Number.Hex),
+            (r'\d+', Number.Integer),
+            # Strings
+            (r"'", String.Char, 'character'),
+            (r'"', String, 'string'),
+            (r'[^\s(){}]+', Text),
+            (r'\s+?', Text),  # Whitespace
+        ],
+        'module': [
+            (r'\s+', Text),
+            (r'([A-Z][\w.]*)(\s+)(\()',
+             bygroups(Name.Namespace, Text, Punctuation), 'funclist'),
+            (r'[A-Z][\w.]*', Name.Namespace, '#pop'),
+        ],
+        'funclist': [
+            (r'\s+', Text),
+            (r'[A-Z]\w*', Keyword.Type),
+            (r'(_[\w\']+|[a-z][\w\']*)', Name.Function),
+            (r'--.*$', Comment.Single),
+            (r'\{-', Comment.Multiline, 'comment'),
+            (r',', Punctuation),
+            (r'[:!#$%&*+.\\/<=>?@^|~-]+', Operator),
+            # (HACK, but it makes sense to push two instances, believe me)
+            (r'\(', Punctuation, ('funclist', 'funclist')),
+            (r'\)', Punctuation, '#pop:2'),
+        ],
+        # NOTE: the next four states are shared in the AgdaLexer; make sure
+        # any change is compatible with Agda as well or copy over and change
+        'comment': [
+            # Multiline Comments
+            (r'[^-{}]+', Comment.Multiline),
+            (r'\{-', Comment.Multiline, '#push'),
+            (r'-\}', Comment.Multiline, '#pop'),
+            (r'[-{}]', Comment.Multiline),
+        ],
+        'character': [
+            # Allows multi-chars, incorrectly.
+            (r"[^\\']", String.Char),
+            (r"\\", String.Escape, 'escape'),
+            ("'", String.Char, '#pop'),
+        ],
+        'string': [
+            (r'[^\\"]+', String),
+            (r"\\", String.Escape, 'escape'),
+            ('"', String, '#pop'),
+        ],
+        'escape': [
+            (r'[abfnrtv"\'&\\]', String.Escape, '#pop'),
+            (r'\^[][A-Z@^_]', String.Escape, '#pop'),
+            ('|'.join(ascii), String.Escape, '#pop'),
+            (r'o[0-7]+', String.Escape, '#pop'),
+            (r'x[\da-fA-F]+', String.Escape, '#pop'),
+            (r'\d+', String.Escape, '#pop'),
+            (r'\s+\\', String.Escape, '#pop')
+        ],
+    }
+
+
+class AgdaLexer(RegexLexer):
+    """
+    For the `Agda <http://wiki.portal.chalmers.se/agda/pmwiki.php>`_
+    dependently typed functional programming language and proof assistant.
+
+    .. versionadded:: 2.0
+    """
+
+    name = 'Agda'
+    aliases = ['agda']
+    filenames = ['*.agda']
+    mimetypes = ['text/x-agda']
+
+    reserved = ['abstract', 'codata', 'coinductive', 'constructor', 'data',
+                'field', 'forall', 'hiding', 'in', 'inductive', 'infix',
+                'infixl', 'infixr', 'instance', 'let', 'mutual', 'open',
+                'pattern', 'postulate', 'primitive', 'private',
+                'quote', 'quoteGoal', 'quoteTerm',
+                'record', 'renaming', 'rewrite', 'syntax', 'tactic',
+                'unquote', 'unquoteDecl', 'using', 'where', 'with']
+
+    tokens = {
+        'root': [
+            # Declaration
+            (r'^(\s*)([^\s(){}]+)(\s*)(:)(\s*)',
+             bygroups(Text, Name.Function, Text, Operator.Word, Text)),
+            # Comments
+            (r'--(?![!#$%&*+./<=>?@^|_~:\\]).*?$', Comment.Single),
+            (r'\{-', Comment.Multiline, 'comment'),
+            # Holes
+            (r'\{!', Comment.Directive, 'hole'),
+            # Lexemes:
+            #  Identifiers
+            (r'\b(%s)(?!\')\b' % '|'.join(reserved), Keyword.Reserved),
+            (r'(import|module)(\s+)', bygroups(Keyword.Reserved, Text), 'module'),
+            (r'\b(Set|Prop)[\u2080-\u2089]*\b', Keyword.Type),
+            #  Special Symbols
+            (r'(\(|\)|\{|\})', Operator),
+            (r'(\.{1,3}|\||\u03BB|\u2200|\u2192|:|=|->)', Operator.Word),
+            #  Numbers
+            (r'\d+[eE][+-]?\d+', Number.Float),
+            (r'\d+\.\d+([eE][+-]?\d+)?', Number.Float),
+            (r'0[xX][\da-fA-F]+', Number.Hex),
+            (r'\d+', Number.Integer),
+            # Strings
+            (r"'", String.Char, 'character'),
+            (r'"', String, 'string'),
+            (r'[^\s(){}]+', Text),
+            (r'\s+?', Text),  # Whitespace
+        ],
+        'hole': [
+            # Holes
+            (r'[^!{}]+', Comment.Directive),
+            (r'\{!', Comment.Directive, '#push'),
+            (r'!\}', Comment.Directive, '#pop'),
+            (r'[!{}]', Comment.Directive),
+        ],
+        'module': [
+            (r'\{-', Comment.Multiline, 'comment'),
+            (r'[a-zA-Z][\w.]*', Name, '#pop'),
+            (r'[\W0-9_]+', Text)
+        ],
+        'comment': HaskellLexer.tokens['comment'],
+        'character': HaskellLexer.tokens['character'],
+        'string': HaskellLexer.tokens['string'],
+        'escape': HaskellLexer.tokens['escape']
+    }
+
+
+class CryptolLexer(RegexLexer):
+    """
+    FIXME: A Cryptol2 lexer based on the lexemes defined in the Haskell 98 Report.
+
+    .. versionadded:: 2.0
+    """
+    name = 'Cryptol'
+    aliases = ['cryptol', 'cry']
+    filenames = ['*.cry']
+    mimetypes = ['text/x-cryptol']
+
+    reserved = ('Arith', 'Bit', 'Cmp', 'False', 'Inf', 'True', 'else',
+                'export', 'extern', 'fin', 'if', 'import', 'inf', 'lg2',
+                'max', 'min', 'module', 'newtype', 'pragma', 'property',
+                'then', 'type', 'where', 'width')
+    ascii = ('NUL', 'SOH', '[SE]TX', 'EOT', 'ENQ', 'ACK',
+             'BEL', 'BS', 'HT', 'LF', 'VT', 'FF', 'CR', 'S[OI]', 'DLE',
+             'DC[1-4]', 'NAK', 'SYN', 'ETB', 'CAN',
+             'EM', 'SUB', 'ESC', '[FGRU]S', 'SP', 'DEL')
+
+    tokens = {
+        'root': [
+            # Whitespace:
+            (r'\s+', Text),
+            # (r'--\s*|.*$', Comment.Doc),
+            (r'//.*$', Comment.Single),
+            (r'/\*', Comment.Multiline, 'comment'),
+            # Lexemes:
+            #  Identifiers
+            (r'\bimport\b', Keyword.Reserved, 'import'),
+            (r'\bmodule\b', Keyword.Reserved, 'module'),
+            (r'\berror\b', Name.Exception),
+            (r'\b(%s)(?!\')\b' % '|'.join(reserved), Keyword.Reserved),
+            (r'^[_a-z][\w\']*', Name.Function),
+            (r"'?[_a-z][\w']*", Name),
+            (r"('')?[A-Z][\w\']*", Keyword.Type),
+            #  Operators
+            (r'\\(?![:!#$%&*+.\\/<=>?@^|~-]+)', Name.Function),  # lambda operator
+            (r'(<-|::|->|=>|=)(?![:!#$%&*+.\\/<=>?@^|~-]+)', Operator.Word),  # specials
+            (r':[:!#$%&*+.\\/<=>?@^|~-]*', Keyword.Type),  # Constructor operators
+            (r'[:!#$%&*+.\\/<=>?@^|~-]+', Operator),  # Other operators
+            #  Numbers
+            (r'\d+[eE][+-]?\d+', Number.Float),
+            (r'\d+\.\d+([eE][+-]?\d+)?', Number.Float),
+            (r'0[oO][0-7]+', Number.Oct),
+            (r'0[xX][\da-fA-F]+', Number.Hex),
+            (r'\d+', Number.Integer),
+            #  Character/String Literals
+            (r"'", String.Char, 'character'),
+            (r'"', String, 'string'),
+            #  Special
+            (r'\[\]', Keyword.Type),
+            (r'\(\)', Name.Builtin),
+            (r'[][(),;`{}]', Punctuation),
+        ],
+        'import': [
+            # Import statements
+            (r'\s+', Text),
+            (r'"', String, 'string'),
+            # after "funclist" state
+            (r'\)', Punctuation, '#pop'),
+            (r'qualified\b', Keyword),
+            # import X as Y
+            (r'([A-Z][\w.]*)(\s+)(as)(\s+)([A-Z][\w.]*)',
+             bygroups(Name.Namespace, Text, Keyword, Text, Name), '#pop'),
+            # import X hiding (functions)
+            (r'([A-Z][\w.]*)(\s+)(hiding)(\s+)(\()',
+             bygroups(Name.Namespace, Text, Keyword, Text, Punctuation), 'funclist'),
+            # import X (functions)
+            (r'([A-Z][\w.]*)(\s+)(\()',
+             bygroups(Name.Namespace, Text, Punctuation), 'funclist'),
+            # import X
+            (r'[\w.]+', Name.Namespace, '#pop'),
+        ],
+        'module': [
+            (r'\s+', Text),
+            (r'([A-Z][\w.]*)(\s+)(\()',
+             bygroups(Name.Namespace, Text, Punctuation), 'funclist'),
+            (r'[A-Z][\w.]*', Name.Namespace, '#pop'),
+        ],
+        'funclist': [
+            (r'\s+', Text),
+            (r'[A-Z]\w*', Keyword.Type),
+            (r'(_[\w\']+|[a-z][\w\']*)', Name.Function),
+            # TODO: these don't match the comments in docs, remove.
+            # (r'--(?![!#$%&*+./<=>?@^|_~:\\]).*?$', Comment.Single),
+            # (r'{-', Comment.Multiline, 'comment'),
+            (r',', Punctuation),
+            (r'[:!#$%&*+.\\/<=>?@^|~-]+', Operator),
+            # (HACK, but it makes sense to push two instances, believe me)
+            (r'\(', Punctuation, ('funclist', 'funclist')),
+            (r'\)', Punctuation, '#pop:2'),
+        ],
+        'comment': [
+            # Multiline Comments
+            (r'[^/*]+', Comment.Multiline),
+            (r'/\*', Comment.Multiline, '#push'),
+            (r'\*/', Comment.Multiline, '#pop'),
+            (r'[*/]', Comment.Multiline),
+        ],
+        'character': [
+            # Allows multi-chars, incorrectly.
+            (r"[^\\']'", String.Char, '#pop'),
+            (r"\\", String.Escape, 'escape'),
+            ("'", String.Char, '#pop'),
+        ],
+        'string': [
+            (r'[^\\"]+', String),
+            (r"\\", String.Escape, 'escape'),
+            ('"', String, '#pop'),
+        ],
+        'escape': [
+            (r'[abfnrtv"\'&\\]', String.Escape, '#pop'),
+            (r'\^[][A-Z@^_]', String.Escape, '#pop'),
+            ('|'.join(ascii), String.Escape, '#pop'),
+            (r'o[0-7]+', String.Escape, '#pop'),
+            (r'x[\da-fA-F]+', String.Escape, '#pop'),
+            (r'\d+', String.Escape, '#pop'),
+            (r'\s+\\', String.Escape, '#pop'),
+        ],
+    }
+
+    EXTRA_KEYWORDS = {'join', 'split', 'reverse', 'transpose', 'width',
+                      'length', 'tail', '<<', '>>', '<<<', '>>>', 'const',
+                      'reg', 'par', 'seq', 'ASSERT', 'undefined', 'error',
+                      'trace'}
+
+    def get_tokens_unprocessed(self, text):
+        stack = ['root']
+        for index, token, value in \
+                RegexLexer.get_tokens_unprocessed(self, text, stack):
+            if token is Name and value in self.EXTRA_KEYWORDS:
+                yield index, Name.Builtin, value
+            else:
+                yield index, token, value
+
+
+class LiterateLexer(Lexer):
+    """
+    Base class for lexers of literate file formats based on LaTeX or Bird-style
+    (prefixing each code line with ">").
+
+    Additional options accepted:
+
+    `litstyle`
+        If given, must be ``"bird"`` or ``"latex"``.  If not given, the style
+        is autodetected: if the first non-whitespace character in the source
+        is a backslash or percent character, LaTeX is assumed, else Bird.
+    """
+
+    bird_re = re.compile(r'(>[ \t]*)(.*\n)')
+
+    def __init__(self, baselexer, **options):
+        self.baselexer = baselexer
+        Lexer.__init__(self, **options)
+
+    def get_tokens_unprocessed(self, text):
+        style = self.options.get('litstyle')
+        if style is None:
+            style = (text.lstrip()[0:1] in '%\\') and 'latex' or 'bird'
+
+        code = ''
+        insertions = []
+        if style == 'bird':
+            # bird-style
+            for match in line_re.finditer(text):
+                line = match.group()
+                m = self.bird_re.match(line)
+                if m:
+                    insertions.append((len(code),
+                                       [(0, Comment.Special, m.group(1))]))
+                    code += m.group(2)
+                else:
+                    insertions.append((len(code), [(0, Text, line)]))
+        else:
+            # latex-style
+            from pygments.lexers.markup import TexLexer
+            lxlexer = TexLexer(**self.options)
+            codelines = 0
+            latex = ''
+            for match in line_re.finditer(text):
+                line = match.group()
+                if codelines:
+                    if line.lstrip().startswith('\\end{code}'):
+                        codelines = 0
+                        latex += line
+                    else:
+                        code += line
+                elif line.lstrip().startswith('\\begin{code}'):
+                    codelines = 1
+                    latex += line
+                    insertions.append((len(code),
+                                       list(lxlexer.get_tokens_unprocessed(latex))))
+                    latex = ''
+                else:
+                    latex += line
+            insertions.append((len(code),
+                               list(lxlexer.get_tokens_unprocessed(latex))))
+        yield from do_insertions(insertions, self.baselexer.get_tokens_unprocessed(code))
+
+
+class LiterateHaskellLexer(LiterateLexer):
+    """
+    For Literate Haskell (Bird-style or LaTeX) source.
+
+    Additional options accepted:
+
+    `litstyle`
+        If given, must be ``"bird"`` or ``"latex"``.  If not given, the style
+        is autodetected: if the first non-whitespace character in the source
+        is a backslash or percent character, LaTeX is assumed, else Bird.
+
+    .. versionadded:: 0.9
+    """
+    name = 'Literate Haskell'
+    aliases = ['lhs', 'literate-haskell', 'lhaskell']
+    filenames = ['*.lhs']
+    mimetypes = ['text/x-literate-haskell']
+
+    def __init__(self, **options):
+        hslexer = HaskellLexer(**options)
+        LiterateLexer.__init__(self, hslexer, **options)
+
+
+class LiterateIdrisLexer(LiterateLexer):
+    """
+    For Literate Idris (Bird-style or LaTeX) source.
+
+    Additional options accepted:
+
+    `litstyle`
+        If given, must be ``"bird"`` or ``"latex"``.  If not given, the style
+        is autodetected: if the first non-whitespace character in the source
+        is a backslash or percent character, LaTeX is assumed, else Bird.
+
+    .. versionadded:: 2.0
+    """
+    name = 'Literate Idris'
+    aliases = ['lidr', 'literate-idris', 'lidris']
+    filenames = ['*.lidr']
+    mimetypes = ['text/x-literate-idris']
+
+    def __init__(self, **options):
+        hslexer = IdrisLexer(**options)
+        LiterateLexer.__init__(self, hslexer, **options)
+
+
+class LiterateAgdaLexer(LiterateLexer):
+    """
+    For Literate Agda source.
+
+    Additional options accepted:
+
+    `litstyle`
+        If given, must be ``"bird"`` or ``"latex"``.  If not given, the style
+        is autodetected: if the first non-whitespace character in the source
+        is a backslash or percent character, LaTeX is assumed, else Bird.
+
+    .. versionadded:: 2.0
+    """
+    name = 'Literate Agda'
+    aliases = ['lagda', 'literate-agda']
+    filenames = ['*.lagda']
+    mimetypes = ['text/x-literate-agda']
+
+    def __init__(self, **options):
+        agdalexer = AgdaLexer(**options)
+        LiterateLexer.__init__(self, agdalexer, litstyle='latex', **options)
+
+
+class LiterateCryptolLexer(LiterateLexer):
+    """
+    For Literate Cryptol (Bird-style or LaTeX) source.
+
+    Additional options accepted:
+
+    `litstyle`
+        If given, must be ``"bird"`` or ``"latex"``.  If not given, the style
+        is autodetected: if the first non-whitespace character in the source
+        is a backslash or percent character, LaTeX is assumed, else Bird.
+
+    .. versionadded:: 2.0
+    """
+    name = 'Literate Cryptol'
+    aliases = ['lcry', 'literate-cryptol', 'lcryptol']
+    filenames = ['*.lcry']
+    mimetypes = ['text/x-literate-cryptol']
+
+    def __init__(self, **options):
+        crylexer = CryptolLexer(**options)
+        LiterateLexer.__init__(self, crylexer, **options)
+
+
+class KokaLexer(RegexLexer):
+    """
+    Lexer for the `Koka <http://koka.codeplex.com>`_
+    language.
+
+    .. versionadded:: 1.6
+    """
+
+    name = 'Koka'
+    aliases = ['koka']
+    filenames = ['*.kk', '*.kki']
+    mimetypes = ['text/x-koka']
+
+    keywords = [
+        'infix', 'infixr', 'infixl',
+        'type', 'cotype', 'rectype', 'alias',
+        'struct', 'con',
+        'fun', 'function', 'val', 'var',
+        'external',
+        'if', 'then', 'else', 'elif', 'return', 'match',
+        'private', 'public', 'private',
+        'module', 'import', 'as',
+        'include', 'inline',
+        'rec',
+        'try', 'yield', 'enum',
+        'interface', 'instance',
+    ]
+
+    # keywords that are followed by a type
+    typeStartKeywords = [
+        'type', 'cotype', 'rectype', 'alias', 'struct', 'enum',
+    ]
+
+    # keywords valid in a type
+    typekeywords = [
+        'forall', 'exists', 'some', 'with',
+    ]
+
+    # builtin names and special names
+    builtin = [
+        'for', 'while', 'repeat',
+        'foreach', 'foreach-indexed',
+        'error', 'catch', 'finally',
+        'cs', 'js', 'file', 'ref', 'assigned',
+    ]
+
+    # symbols that can be in an operator
+    symbols = r'[$%&*+@!/\\^~=.:\-?|<>]+'
+
+    # symbol boundary: an operator keyword should not be followed by any of these
+    sboundary = '(?!' + symbols + ')'
+
+    # name boundary: a keyword should not be followed by any of these
+    boundary = r'(?![\w/])'
+
+    # koka token abstractions
+    tokenType = Name.Attribute
+    tokenTypeDef = Name.Class
+    tokenConstructor = Generic.Emph
+
+    # main lexer
+    tokens = {
+        'root': [
+            include('whitespace'),
+
+            # go into type mode
+            (r'::?' + sboundary, tokenType, 'type'),
+            (r'(alias)(\s+)([a-z]\w*)?', bygroups(Keyword, Text, tokenTypeDef),
+             'alias-type'),
+            (r'(struct)(\s+)([a-z]\w*)?', bygroups(Keyword, Text, tokenTypeDef),
+             'struct-type'),
+            ((r'(%s)' % '|'.join(typeStartKeywords)) +
+             r'(\s+)([a-z]\w*)?', bygroups(Keyword, Text, tokenTypeDef),
+             'type'),
+
+            # special sequences of tokens (we use ?: for non-capturing group as
+            # required by 'bygroups')
+            (r'(module)(\s+)(interface\s+)?((?:[a-z]\w*/)*[a-z]\w*)',
+             bygroups(Keyword, Text, Keyword, Name.Namespace)),
+            (r'(import)(\s+)((?:[a-z]\w*/)*[a-z]\w*)'
+             r'(?:(\s*)(=)(\s*)((?:qualified\s*)?)'
+             r'((?:[a-z]\w*/)*[a-z]\w*))?',
+             bygroups(Keyword, Text, Name.Namespace, Text, Keyword, Text,
+                      Keyword, Name.Namespace)),
+
+            (r'(^(?:(?:public|private)\s*)?(?:function|fun|val))'
+             r'(\s+)([a-z]\w*|\((?:' + symbols + r'|/)\))',
+             bygroups(Keyword, Text, Name.Function)),
+            (r'(^(?:(?:public|private)\s*)?external)(\s+)(inline\s+)?'
+             r'([a-z]\w*|\((?:' + symbols + r'|/)\))',
+             bygroups(Keyword, Text, Keyword, Name.Function)),
+
+            # keywords
+            (r'(%s)' % '|'.join(typekeywords) + boundary, Keyword.Type),
+            (r'(%s)' % '|'.join(keywords) + boundary, Keyword),
+            (r'(%s)' % '|'.join(builtin) + boundary, Keyword.Pseudo),
+            (r'::?|:=|\->|[=.]' + sboundary, Keyword),
+
+            # names
+            (r'((?:[a-z]\w*/)*)([A-Z]\w*)',
+             bygroups(Name.Namespace, tokenConstructor)),
+            (r'((?:[a-z]\w*/)*)([a-z]\w*)', bygroups(Name.Namespace, Name)),
+            (r'((?:[a-z]\w*/)*)(\((?:' + symbols + r'|/)\))',
+             bygroups(Name.Namespace, Name)),
+            (r'_\w*', Name.Variable),
+
+            # literal string
+            (r'@"', String.Double, 'litstring'),
+
+            # operators
+            (symbols + "|/(?![*/])", Operator),
+            (r'`', Operator),
+            (r'[{}()\[\];,]', Punctuation),
+
+            # literals. No check for literal characters with len > 1
+            (r'[0-9]+\.[0-9]+([eE][\-+]?[0-9]+)?', Number.Float),
+            (r'0[xX][0-9a-fA-F]+', Number.Hex),
+            (r'[0-9]+', Number.Integer),
+
+            (r"'", String.Char, 'char'),
+            (r'"', String.Double, 'string'),
+        ],
+
+        # type started by alias
+        'alias-type': [
+            (r'=', Keyword),
+            include('type')
+        ],
+
+        # type started by struct
+        'struct-type': [
+            (r'(?=\((?!,*\)))', Punctuation, '#pop'),
+            include('type')
+        ],
+
+        # type started by colon
+        'type': [
+            (r'[(\[<]', tokenType, 'type-nested'),
+            include('type-content')
+        ],
+
+        # type nested in brackets: can contain parameters, comma etc.
+        'type-nested': [
+            (r'[)\]>]', tokenType, '#pop'),
+            (r'[(\[<]', tokenType, 'type-nested'),
+            (r',', tokenType),
+            (r'([a-z]\w*)(\s*)(:)(?!:)',
+             bygroups(Name, Text, tokenType)),  # parameter name
+            include('type-content')
+        ],
+
+        # shared contents of a type
+        'type-content': [
+            include('whitespace'),
+
+            # keywords
+            (r'(%s)' % '|'.join(typekeywords) + boundary, Keyword),
+            (r'(?=((%s)' % '|'.join(keywords) + boundary + '))',
+             Keyword, '#pop'),  # need to match because names overlap...
+
+            # kinds
+            (r'[EPHVX]' + boundary, tokenType),
+
+            # type names
+            (r'[a-z][0-9]*(?![\w/])', tokenType),
+            (r'_\w*', tokenType.Variable),  # Generic.Emph
+            (r'((?:[a-z]\w*/)*)([A-Z]\w*)',
+             bygroups(Name.Namespace, tokenType)),
+            (r'((?:[a-z]\w*/)*)([a-z]\w+)',
+             bygroups(Name.Namespace, tokenType)),
+
+            # type keyword operators
+            (r'::|->|[.:|]', tokenType),
+
+            # catchall
+            default('#pop')
+        ],
+
+        # comments and literals
+        'whitespace': [
+            (r'\n\s*#.*$', Comment.Preproc),
+            (r'\s+', Text),
+            (r'/\*', Comment.Multiline, 'comment'),
+            (r'//.*$', Comment.Single)
+        ],
+        'comment': [
+            (r'[^/*]+', Comment.Multiline),
+            (r'/\*', Comment.Multiline, '#push'),
+            (r'\*/', Comment.Multiline, '#pop'),
+            (r'[*/]', Comment.Multiline),
+        ],
+        'litstring': [
+            (r'[^"]+', String.Double),
+            (r'""', String.Escape),
+            (r'"', String.Double, '#pop'),
+        ],
+        'string': [
+            (r'[^\\"\n]+', String.Double),
+            include('escape-sequence'),
+            (r'["\n]', String.Double, '#pop'),
+        ],
+        'char': [
+            (r'[^\\\'\n]+', String.Char),
+            include('escape-sequence'),
+            (r'[\'\n]', String.Char, '#pop'),
+        ],
+        'escape-sequence': [
+            (r'\\[nrt\\"\']', String.Escape),
+            (r'\\x[0-9a-fA-F]{2}', String.Escape),
+            (r'\\u[0-9a-fA-F]{4}', String.Escape),
+            # Yes, \U literals are 6 hex digits.
+            (r'\\U[0-9a-fA-F]{6}', String.Escape)
+        ]
+    }