Modify moonscript lexer to get correct syntax highlighting

of interpolated strings

moonscript.py

@@ -0,0 +1,89 @@
+from pygments.lexer import default, combined, include, words
+from pygments.lexers.scripting import LuaLexer
+from pygments.token import *
+
+def all_lua_builtins():
+    from pygments.lexers._lua_builtins import MODULES
+    return [w for values in MODULES.values() for w in values]
+
+class CustomLexer(LuaLexer):
+    """
+    For MoonScript source code.
+    """
+
+    name = 'MoonScript'
+    url = 'http://moonscript.org'
+    aliases = ['moonscript', 'moon']
+    filenames = ['*.moon']
+    mimetypes = ['text/x-moonscript', 'application/x-moonscript']
+    version_added = '1.5'
+
+    tokens = {
+        'root': [
+            (r'#!(.*?)$', Comment.Preproc),
+            default('base')
+        ],
+        'base': [
+            ('--.*$', Comment.Single),
+            (r'(?i)(\d*\.\d+|\d+\.\d*)(e[+-]?\d+)?', Number.Float),
+            (r'(?i)\d+e[+-]?\d+', Number.Float),
+            (r'(?i)0x[0-9a-f]*', Number.Hex),
+            (r'\d+', Number.Integer),
+            (r'\n', Whitespace),
+            (r'[^\S\n]+', Text),
+            (r'(?s)\[(=*)\[.*?\]\1\]', String),
+            (r'(->|=>)', Name.Function),
+            (r':[a-zA-Z_]\w*', Name.Variable),
+            (r'(==|!=|~=|<=|>=|\.\.\.|\.\.|[=+\-*/%^<>#!.\\:])', Operator),
+            (r'[;,]', Punctuation),
+            (r'[\[\]{}()]', Keyword.Type),
+            (r'[a-zA-Z_]\w*:', Name.Variable),
+            (words((
+                'class', 'extends', 'if', 'then', 'super', 'do', 'with',
+                'import', 'export', 'while', 'elseif', 'return', 'for', 'in',
+                'from', 'when', 'using', 'else', 'and', 'or', 'not', 'switch',
+                'break'), suffix=r'\b'),
+             Keyword),
+            (r'(true|false|nil)\b', Keyword.Constant),
+            (r'(and|or|not)\b', Operator.Word),
+            (r'(self)\b', Name.Builtin.Pseudo),
+            (r'@@?([a-zA-Z_]\w*)?', Name.Variable.Class),
+            (r'[A-Z]\w*', Name.Class),  # proper name
+            (words(all_lua_builtins(), suffix=r"\b"), Name.Builtin),
+            (r'[A-Za-z_]\w*', Name),
+            ("'", String.Single, combined('stringescape', 'sqs')),
+            ('"', String.Double, combined('stringescape', 'dqs')),
+        ],
+        'stringescape': [
+            (r'''\\([abfnrtv\\"']|\d{1,3})''', String.Escape)
+        ],
+        'strings': [
+            (r'[^#\\\'"]+', String),
+            # note that all coffee script strings are multi-line.
+            # hashmarks, quotes and backslashes must be parsed one at a time
+        ],
+        'interpoling_string': [
+            (r'\}', String.Interpol, "#pop"),
+            include('base')
+        ],
+        'dqs': [
+            (r'"', String, '#pop'),
+            (r'\\.|\'', String),  # double-quoted string don't need ' escapes
+            (r'#\{', String.Interpol, "interpoling_string"),
+            (r'#', String),
+            include('strings')
+        ],
+        'sqs': [
+            (r"'", String, '#pop'),
+            (r'#|\\.|"', String),  # single quoted strings don't need " escapses
+            include('strings')
+        ]
+    }
+
+    def get_tokens_unprocessed(self, text):
+        # set . as Operator instead of Punctuation
+        for index, token, value in LuaLexer.get_tokens_unprocessed(self, text):
+            if token == Punctuation and value == ".":
+                token = Operator
+            yield index, token, value
+