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name : savi.py
 """
    pygments.lexers.savi
    ~~~~~~~~~~~~~~~~~~~~

    Lexer for Savi.

    :copyright: Copyright 2006-2023 by the Pygments team, see AUTHORS.
    :license: BSD, see LICENSE for details.
"""

from pygments.lexer import RegexLexer, bygroups, include
from pygments.token import Whitespace, Keyword, Name, String, Number, \
  Operator, Punctuation, Comment, Generic, Error

__all__ = ['SaviLexer']


# The canonical version of this file can be found in the following repository,
# where it is kept in sync with any language changes, as well as the other
# pygments-like lexers that are maintained for use with other tools:
# - https://github.com/savi-lang/savi/blob/main/tooling/pygments/lexers/savi.py
#
# If you're changing this file in the pygments repository, please ensure that
# any changes you make are also propagated to the official Savi repository,
# in order to avoid accidental clobbering of your changes later when an update
# from the Savi repository flows forward into the pygments repository.
#
# If you're changing this file in the Savi repository, please ensure that
# any changes you make are also reflected in the other pygments-like lexers
# (rouge, vscode, etc) so that all of the lexers can be kept cleanly in sync.

class SaviLexer(RegexLexer):
  """
  For Savi source code.

  .. versionadded: 2.10
  """

  name = 'Savi'
  url = 'https://github.com/savi-lang/savi'
  aliases = ['savi']
  filenames = ['*.savi']

  tokens = {
    "root": [
      # Line Comment
      (r'//.*?$', Comment.Single),

      # Doc Comment
      (r'::.*?$', Comment.Single),

      # Capability Operator
      (r'(\')(\w+)(?=[^\'])', bygroups(Operator, Name)),

      # Double-Quote String
      (r'\w?"', String.Double, "string.double"),

      # Single-Char String
      (r"'", String.Char, "string.char"),

      # Type Name
      (r'(_?[A-Z]\w*)', Name.Class),

      # Nested Type Name
      (r'(\.)(\s*)(_?[A-Z]\w*)', bygroups(Punctuation, Whitespace, Name.Class)),

      # Declare
      (r'^([ \t]*)(:\w+)',
        bygroups(Whitespace, Name.Tag),
        "decl"),

      # Error-Raising Calls/Names
      (r'((\w+|\+|\-|\*)\!)', Generic.Deleted),

      # Numeric Values
      (r'\b\d([\d_]*(\.[\d_]+)?)\b', Number),

      # Hex Numeric Values
      (r'\b0x([0-9a-fA-F_]+)\b', Number.Hex),

      # Binary Numeric Values
      (r'\b0b([01_]+)\b', Number.Bin),

      # Function Call (with braces)
      (r'\w+(?=\()', Name.Function),

      # Function Call (with receiver)
      (r'(\.)(\s*)(\w+)', bygroups(Punctuation, Whitespace, Name.Function)),

      # Function Call (with self receiver)
      (r'(@)(\w+)', bygroups(Punctuation, Name.Function)),

      # Parenthesis
      (r'\(', Punctuation, "root"),
      (r'\)', Punctuation, "#pop"),

      # Brace
      (r'\{', Punctuation, "root"),
      (r'\}', Punctuation, "#pop"),

      # Bracket
      (r'\[', Punctuation, "root"),
      (r'(\])(\!)', bygroups(Punctuation, Generic.Deleted), "#pop"),
      (r'\]', Punctuation, "#pop"),

      # Punctuation
      (r'[,;:\.@]', Punctuation),

      # Piping Operators
      (r'(\|\>)', Operator),

      # Branching Operators
      (r'(\&\&|\|\||\?\?|\&\?|\|\?|\.\?)', Operator),

      # Comparison Operators
      (r'(\<\=\>|\=\~|\=\=|\<\=|\>\=|\<|\>)', Operator),

      # Arithmetic Operators
      (r'(\+|\-|\/|\*|\%)', Operator),

      # Assignment Operators
      (r'(\=)', Operator),

      # Other Operators
      (r'(\!|\<\<|\<|\&|\|)', Operator),

      # Identifiers
      (r'\b\w+\b', Name),

      # Whitespace
      (r'[ \t\r]+\n*|\n+', Whitespace),
    ],

    # Declare (nested rules)
    "decl": [
      (r'\b[a-z_]\w*\b(?!\!)', Keyword.Declaration),
      (r':', Punctuation, "#pop"),
      (r'\n', Whitespace, "#pop"),
      include("root"),
    ],

    # Double-Quote String (nested rules)
    "string.double": [
      (r'\\\(', String.Interpol, "string.interpolation"),
      (r'\\u[0-9a-fA-F]{4}', String.Escape),
      (r'\\x[0-9a-fA-F]{2}', String.Escape),
      (r'\\[bfnrt\\\']', String.Escape),
      (r'\\"', String.Escape),
      (r'"', String.Double, "#pop"),
      (r'[^\\"]+', String.Double),
      (r'.', Error),
    ],

    # Single-Char String (nested rules)
    "string.char": [
      (r'\\u[0-9a-fA-F]{4}', String.Escape),
      (r'\\x[0-9a-fA-F]{2}', String.Escape),
      (r'\\[bfnrt\\\']', String.Escape),
      (r"\\'", String.Escape),
      (r"'", String.Char, "#pop"),
      (r"[^\\']+", String.Char),
      (r'.', Error),
    ],

    # Interpolation inside String (nested rules)
    "string.interpolation": [
      (r"\)", String.Interpol, "#pop"),
      include("root"),
    ]
  }
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