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env/lib/python3.11/site-packages/pygments/lexers/nix.py

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+"""
+    pygments.lexers.nix
+    ~~~~~~~~~~~~~~~~~~~
+
+    Lexers for the NixOS Nix language.
+
+    :copyright: Copyright 2006-2024 by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+import re
+
+from pygments.lexer import RegexLexer, include
+from pygments.token import Text, Comment, Operator, Keyword, Name, String, \
+    Number, Punctuation, Literal
+
+__all__ = ['NixLexer']
+
+
+class NixLexer(RegexLexer):
+    """
+    For the Nix language.
+    """
+
+    name = 'Nix'
+    url = 'http://nixos.org/nix/'
+    aliases = ['nixos', 'nix']
+    filenames = ['*.nix']
+    mimetypes = ['text/x-nix']
+    version_added = '2.0'
+
+    keywords = ['rec', 'with', 'let', 'in', 'inherit', 'assert', 'if',
+                'else', 'then', '...']
+    builtins = ['import', 'abort', 'baseNameOf', 'dirOf', 'isNull', 'builtins',
+                'map', 'removeAttrs', 'throw', 'toString', 'derivation']
+    operators = ['++', '+', '?', '.', '!', '//', '==', '/',
+                 '!=', '&&', '||', '->', '=', '<', '>', '*', '-']
+
+    punctuations = ["(", ")", "[", "]", ";", "{", "}", ":", ",", "@"]
+
+    tokens = {
+        'root': [
+            # comments starting with #
+            (r'#.*$', Comment.Single),
+
+            # multiline comments
+            (r'/\*', Comment.Multiline, 'comment'),
+
+            # whitespace
+            (r'\s+', Text),
+
+            # keywords
+            ('({})'.format('|'.join(re.escape(entry) + '\\b' for entry in keywords)), Keyword),
+
+            # highlight the builtins
+            ('({})'.format('|'.join(re.escape(entry) + '\\b' for entry in builtins)),
+             Name.Builtin),
+
+            (r'\b(true|false|null)\b', Name.Constant),
+
+            # floats
+            (r'-?(\d+\.\d*|\.\d+)([eE][-+]?\d+)?', Number.Float),
+
+            # integers
+            (r'-?[0-9]+', Number.Integer),
+
+            # paths
+            (r'[\w.+-]*(\/[\w.+-]+)+', Literal),
+            (r'~(\/[\w.+-]+)+', Literal),
+            (r'\<[\w.+-]+(\/[\w.+-]+)*\>', Literal),
+
+            # operators
+            ('({})'.format('|'.join(re.escape(entry) for entry in operators)),
+             Operator),
+
+            # word operators
+            (r'\b(or|and)\b', Operator.Word),
+
+            (r'\{', Punctuation, 'block'),
+
+            # punctuations
+            ('({})'.format('|'.join(re.escape(entry) for entry in punctuations)), Punctuation),
+
+            # strings
+            (r'"', String.Double, 'doublequote'),
+            (r"''", String.Multiline, 'multiline'),
+
+            # urls
+            (r'[a-zA-Z][a-zA-Z0-9\+\-\.]*\:[\w%/?:@&=+$,\\.!~*\'-]+', Literal),
+
+            # names of variables
+            (r'[\w-]+(?=\s*=)', String.Symbol),
+            (r'[a-zA-Z_][\w\'-]*', Text),
+
+            (r"\$\{", String.Interpol, 'antiquote'),
+        ],
+        'comment': [
+            (r'[^/*]+', Comment.Multiline),
+            (r'/\*', Comment.Multiline, '#push'),
+            (r'\*/', Comment.Multiline, '#pop'),
+            (r'[*/]', Comment.Multiline),
+        ],
+        'multiline': [
+            (r"''(\$|'|\\n|\\r|\\t|\\)", String.Escape),
+            (r"''", String.Multiline, '#pop'),
+            (r'\$\{', String.Interpol, 'antiquote'),
+            (r"[^'\$]+", String.Multiline),
+            (r"\$[^\{']", String.Multiline),
+            (r"'[^']", String.Multiline),
+            (r"\$(?=')", String.Multiline),
+        ],
+        'doublequote': [
+            (r'\\(\\|"|\$|n)', String.Escape),
+            (r'"', String.Double, '#pop'),
+            (r'\$\{', String.Interpol, 'antiquote'),
+            (r'[^"\\\$]+', String.Double),
+            (r'\$[^\{"]', String.Double),
+            (r'\$(?=")', String.Double),
+            (r'\\', String.Double),
+        ],
+        'antiquote': [
+            (r"\}", String.Interpol, '#pop'),
+            # TODO: we should probably escape also here ''${ \${
+            (r"\$\{", String.Interpol, '#push'),
+            include('root'),
+        ],
+        'block': [
+            (r"\}", Punctuation, '#pop'),
+            include('root'),
+        ],
+    }
+
+    def analyse_text(text):
+        rv = 0.0
+        # TODO: let/in
+        if re.search(r'import.+?<[^>]+>', text):
+            rv += 0.4
+        if re.search(r'mkDerivation\s+(\(|\{|rec)', text):
+            rv += 0.4
+        if re.search(r'=\s+mkIf\s+', text):
+            rv += 0.4
+        if re.search(r'\{[a-zA-Z,\s]+\}:', text):
+            rv += 0.1
+        return rv