text: # -*- coding: utf-8 -*-
  """
      pygments.lexers.verification
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  
      Lexer for Intermediate Verification Languages (IVLs).
  
      :copyright: Copyright 2006-2016 by the Pygments team, see AUTHORS.
      :license: BSD, see LICENSE for details.
  """
  
  from pygments.lexer import RegexLexer, include, words
  from pygments.token import Comment, Operator, Keyword, Name, Number, \
      Punctuation, Whitespace
  
  __all__ = ['BoogieLexer', 'SilverLexer']
  
  
  class BoogieLexer(RegexLexer):
      """
      For `Boogie <https://boogie.codeplex.com/>`_ source code.
  
      .. versionadded:: 2.1
      """
      name = 'Boogie'
      aliases = ['boogie']
      filenames = ['*.bpl']
  
      tokens = {
          'root': [
              # Whitespace and Comments
              (r'\n', Whitespace),
              (r'\s+', Whitespace),
              (r'//[/!](.*?)\n', Comment.Doc),
              (r'//(.*?)\n', Comment.Single),
              (r'/\*', Comment.Multiline, 'comment'),
  
              (words((
                  'axiom', 'break', 'call', 'ensures', 'else', 'exists', 'function',
                  'forall', 'if', 'invariant', 'modifies', 'procedure',  'requires',
                  'then', 'var', 'while'),
               suffix=r'\b'), Keyword),
              (words(('const',), suffix=r'\b'), Keyword.Reserved),
  
              (words(('bool', 'int', 'ref'), suffix=r'\b'), Keyword.Type),
              include('numbers'),
              (r"(>=|<=|:=|!=|==>|&&|\|\||[+/\-=>*<\[\]])", Operator),
              (r"([{}():;,.])", Punctuation),
              # Identifier
              (r'[a-zA-Z_]\w*', Name),
          ],
          'comment': [
              (r'[^*/]+', Comment.Multiline),
              (r'/\*', Comment.Multiline, '#push'),
              (r'\*/', Comment.Multiline, '#pop'),
              (r'[*/]', Comment.Multiline),
          ],
          'numbers': [
              (r'[0-9]+', Number.Integer),
          ],
      }
  
  
  class SilverLexer(RegexLexer):
      """
      For `Silver <https://bitbucket.org/viperproject/silver>`_ source code.
  
      .. versionadded:: 2.2
      """
      name = 'Silver'
      aliases = ['silver']
      filenames = ['*.sil']
  
      tokens = {
          'root': [
              # Whitespace and Comments
              (r'\n', Whitespace),
              (r'\s+', Whitespace),
              (r'//[/!](.*?)\n', Comment.Doc),
              (r'//(.*?)\n', Comment.Single),
              (r'/\*', Comment.Multiline, 'comment'),
  
              (words((
                  'result', 'true', 'false', 'null', 'method', 'function',
                  'predicate', 'program', 'domain', 'axiom', 'var', 'returns',
                  'field', 'define', 'requires', 'ensures', 'invariant',
                  'fold', 'unfold', 'inhale', 'exhale', 'new', 'assert',
                  'assume', 'goto', 'while', 'if', 'elseif', 'else', 'fresh',
                  'constraining', 'Seq', 'Set', 'Multiset', 'union', 'intersection',
                  'setminus', 'subset', 'unfolding', 'in', 'old', 'forall', 'exists',
                  'acc', 'wildcard', 'write', 'none', 'epsilon', 'perm', 'unique'),
               suffix=r'\b'), Keyword),
              (words(('Int', 'Perm', 'Bool', 'Ref'), suffix=r'\b'), Keyword.Type),
              include('numbers'),
  
              (r'[!%&*+=|?:<>/-]', Operator),
              (r"([{}():;,.])", Punctuation),
              # Identifier
              (r'[\w$]\w*', Name),
          ],
          'comment': [
              (r'[^*/]+', Comment.Multiline),
              (r'/\*', Comment.Multiline, '#push'),
              (r'\*/', Comment.Multiline, '#pop'),
              (r'[*/]', Comment.Multiline),
          ],
          'numbers': [
              (r'[0-9]+', Number.Integer),
          ],
      }
  