Mercurial Repositories > eric / file diff

--- a/eric6/ThirdParty/Pygments/pygments/lexers/grammar_notation.py	Tue Apr 21 19:44:19 2020 +0200
+++ b/eric6/ThirdParty/Pygments/pygments/lexers/grammar_notation.py	Tue Apr 21 19:47:10 2020 +0200
@@ -5,7 +5,7 @@
 
     Lexers for grammer notations like BNF.
 
-    :copyright: Copyright 2006-2017 by the Pygments team, see AUTHORS.
+    :copyright: Copyright 2006-2019 by the Pygments team, see AUTHORS.
     :license: BSD, see LICENSE for details.
 """
 
@@ -15,7 +15,7 @@
 from pygments.token import Comment, Keyword, Literal, Name, Number, \
     Operator, Punctuation, String, Text
 
-__all__ = ['BnfLexer', 'AbnfLexer', 'JsgfLexer']
+__all__ = ['BnfLexer', 'AbnfLexer', 'JsgfLexer', 'PegLexer']
 
 
 class BnfLexer(RegexLexer):
@@ -211,3 +211,60 @@
             (r'.', Comment.Multiline),
         ],
     }
+
+
+class PegLexer(RegexLexer):
+    """
+    This lexer is for `Parsing Expression Grammars
+    <https://bford.info/pub/lang/peg.pdf>`_ (PEG).
+
+    Various implementations of PEG have made different decisions
+    regarding the syntax, so let's try to be accommodating:
+
+    * `<-`, `←`, `:`, and `=` are all accepted as rule operators.
+
+    * Both `|` and `/` are choice operators.
+
+    * `^`, `↑`, and `~` are cut operators.
+
+    * A single `a-z` character immediately before a string, or
+      multiple `a-z` characters following a string, are part of the
+      string (e.g., `r"..."` or `"..."ilmsuxa`).
+
+    .. versionadded:: 2.6
+    """
+
+    name = 'PEG'
+    aliases = ['peg']
+    filenames = ['*.peg']
+    mimetypes = ['text/x-peg']
+
+    tokens = {
+        'root': [
+            # Comments
+            (r'#.*', Comment.Single),
+
+            # All operators
+            (r'<-|[←:=/|&!?*+^↑~]', Operator),
+
+            # Other punctuation
+            (r'[()]', Punctuation),
+
+            # Keywords
+            (r'\.', Keyword),
+
+            # Character classes
+            (r'(\[)([^\]]*(?:\\.[^\]\\]*)*)(\])',
+             bygroups(Punctuation, String, Punctuation)),
+
+            # Single and double quoted strings (with optional modifiers)
+            (r'[a-z]?"[^"\\]*(?:\\.[^"\\]*)*"[a-z]*', String.Double),
+            (r"[a-z]?'[^'\\]*(?:\\.[^'\\]*)*'[a-z]*", String.Single),
+
+            # Nonterminals are not whitespace, operators, or punctuation
+            (r'[^\s<←:=/|&!?*+\^↑~()\[\]"\'#]+', Name.Class),
+
+            # Fallback
+            (r'.', Text),
+        ],
+    }