Revert "Cleanup Python 2 compact from Lexers"

IPython/lib/lexers.py

@@ -4,13 +4,13 b' Defines a variety of Pygments lexers for highlighting IPython code.'
 
 This includes:
 
-    IPython3Lexer
-        Lexer for pure IPython (python + magic/shell commands)
+    IPythonLexer, IPython3Lexer
+        Lexers for pure IPython (python + magic/shell commands)
 
     IPythonPartialTracebackLexer, IPythonTracebackLexer
-        The partial traceback lexer reads everything but the Python code
-        appearing in a traceback.
-        The full lexer combines the partial lexer with the IPython3Lexer.
+        Supports 2.x and 3.x via keyword `python3`.  The partial traceback
+        lexer reads everything but the Python code appearing in a traceback.
+        The full lexer combines the partial lexer with an IPython lexer.
 
     IPythonConsoleLexer
         A lexer for IPython console sessions, with support for tracebacks.
@@ -35,22 +35,10 b' import re'
 
 # Third party
 from pygments.lexers import (
-    BashLexer,
-    HtmlLexer,
-    JavascriptLexer,
-    RubyLexer,
-    PerlLexer,
-    Python3Lexer,
-    TexLexer,
-)
+    BashLexer, HtmlLexer, JavascriptLexer, RubyLexer, PerlLexer, PythonLexer,
+    Python3Lexer, TexLexer)
 from pygments.lexer import (
-    Lexer,
-    DelegatingLexer,
-    RegexLexer,
-    do_insertions,
-    bygroups,
-    using,
-    inherit,
+    Lexer, DelegatingLexer, RegexLexer, do_insertions, bygroups, using,
 )
 from pygments.token import (
     Generic, Keyword, Literal, Name, Operator, Other, Text, Error,
@@ -61,106 +49,80 b' from pygments.util import get_bool_opt'
 
 line_re = re.compile('.*?\n')
 
-__all__ = [
-    "IPython3Lexer",
-    "IPythonPartialTracebackLexer",
-    "IPythonTracebackLexer",
-    "IPythonConsoleLexer",
-    "IPyLexer",
-]
+__all__ = ['build_ipy_lexer', 'IPython3Lexer', 'IPythonLexer',
+           'IPythonPartialTracebackLexer', 'IPythonTracebackLexer',
+           'IPythonConsoleLexer', 'IPyLexer']
 
 
-class IPython3Lexer(Python3Lexer):
-    """IPython3 Lexer"""
+def build_ipy_lexer(python3):
+    """Builds IPython lexers depending on the value of `python3`.
 
-    name = "IPython3"
-    aliases = ["ipython3"]
+    The lexer inherits from an appropriate Python lexer and then adds
+    information about IPython specific keywords (i.e. magic commands,
+    shell commands, etc.)
 
-    tokens = {
-        "root": [
-            (
-                r"(?s)(\s*)(%%capture)([^\n]*\n)(.*)",
-                bygroups(Text, Operator, Text, using(Python3Lexer)),
-            ),
-            (
-                r"(?s)(\s*)(%%debug)([^\n]*\n)(.*)",
-                bygroups(Text, Operator, Text, using(Python3Lexer)),
-            ),
-            (
-                r"(?is)(\s*)(%%html)([^\n]*\n)(.*)",
-                bygroups(Text, Operator, Text, using(HtmlLexer)),
-            ),
-            (
-                r"(?s)(\s*)(%%javascript)([^\n]*\n)(.*)",
-                bygroups(Text, Operator, Text, using(JavascriptLexer)),
-            ),
-            (
-                r"(?s)(\s*)(%%js)([^\n]*\n)(.*)",
-                bygroups(Text, Operator, Text, using(JavascriptLexer)),
-            ),
-            (
-                r"(?s)(\s*)(%%latex)([^\n]*\n)(.*)",
-                bygroups(Text, Operator, Text, using(TexLexer)),
-            ),
-            (
-                r"(?s)(\s*)(%%perl)([^\n]*\n)(.*)",
-                bygroups(Text, Operator, Text, using(PerlLexer)),
-            ),
-            (
-                r"(?s)(\s*)(%%prun)([^\n]*\n)(.*)",
-                bygroups(Text, Operator, Text, using(Python3Lexer)),
-            ),
-            (
-                r"(?s)(\s*)(%%pypy)([^\n]*\n)(.*)",
-                bygroups(Text, Operator, Text, using(Python3Lexer)),
-            ),
-            (
-                r"(?s)(\s*)(%%python)([^\n]*\n)(.*)",
-                bygroups(Text, Operator, Text, using(Python3Lexer)),
-            ),
-            (
-                r"(?s)(\s*)(%%python3)([^\n]*\n)(.*)",
-                bygroups(Text, Operator, Text, using(Python3Lexer)),
-            ),
-            (
-                r"(?s)(\s*)(%%ruby)([^\n]*\n)(.*)",
-                bygroups(Text, Operator, Text, using(RubyLexer)),
-            ),
-            (
-                r"(?s)(\s*)(%%time)([^\n]*\n)(.*)",
-                bygroups(Text, Operator, Text, using(Python3Lexer)),
-            ),
-            (
-                r"(?s)(\s*)(%%timeit)([^\n]*\n)(.*)",
-                bygroups(Text, Operator, Text, using(Python3Lexer)),
-            ),
-            (
-                r"(?s)(\s*)(%%writefile)([^\n]*\n)(.*)",
-                bygroups(Text, Operator, Text, using(Python3Lexer)),
-            ),
-            (
-                r"(?s)(\s*)(%%file)([^\n]*\n)(.*)",
-                bygroups(Text, Operator, Text, using(Python3Lexer)),
-            ),
-            (r"(?s)(\s*)(%%)(\w+)(.*)", bygroups(Text, Operator, Keyword, Text)),
-            (
-                r"(?s)(^\s*)(%%!)([^\n]*\n)(.*)",
-                bygroups(Text, Operator, Text, using(BashLexer)),
-            ),
-            (r"(%%?)(\w+)(\?\??)$", bygroups(Operator, Keyword, Operator)),
-            (r"\b(\?\??)(\s*)$", bygroups(Operator, Text)),
-            (
-                r"(%)(sx|sc|system)(.*)(\n)",
-                bygroups(Operator, Keyword, using(BashLexer), Text),
-            ),
-            (r"(%)(\w+)(.*\n)", bygroups(Operator, Keyword, Text)),
-            (r"^(!!)(.+)(\n)", bygroups(Operator, using(BashLexer), Text)),
-            (r"(!)(?!=)(.+)(\n)", bygroups(Operator, using(BashLexer), Text)),
-            (r"^(\s*)(\?\??)(\s*%{0,2}[\w\.\*]*)", bygroups(Text, Operator, Text)),
-            (r"(\s*%{0,2}[\w\.\*]*)(\?\??)(\s*)$", bygroups(Text, Operator, Text)),
-            inherit,
-        ]
-    }
+    Parameters
+    ----------
+    python3 : bool
+        If `True`, then build an IPython lexer from a Python 3 lexer.
+
+    """
+    # It would be nice to have a single IPython lexer class which takes
+    # a boolean `python3`.  But since there are two Python lexer classes,
+    # we will also have two IPython lexer classes.
+    if python3:
+        PyLexer = Python3Lexer
+        name = 'IPython3'
+        aliases = ['ipython3']
+        doc = """IPython3 Lexer"""
+    else:
+        PyLexer = PythonLexer
+        name = 'IPython'
+        aliases = ['ipython2', 'ipython']
+        doc = """IPython Lexer"""
+
+    ipython_tokens = [
+       (r'(?s)(\s*)(%%capture)([^\n]*\n)(.*)', bygroups(Text, Operator, Text, using(PyLexer))),
+        (r'(?s)(\s*)(%%debug)([^\n]*\n)(.*)', bygroups(Text, Operator, Text, using(PyLexer))),
+        (r'(?is)(\s*)(%%html)([^\n]*\n)(.*)', bygroups(Text, Operator, Text, using(HtmlLexer))),
+        (r'(?s)(\s*)(%%javascript)([^\n]*\n)(.*)', bygroups(Text, Operator, Text, using(JavascriptLexer))),
+        (r'(?s)(\s*)(%%js)([^\n]*\n)(.*)', bygroups(Text, Operator, Text, using(JavascriptLexer))),
+        (r'(?s)(\s*)(%%latex)([^\n]*\n)(.*)', bygroups(Text, Operator, Text, using(TexLexer))),
+        (r'(?s)(\s*)(%%perl)([^\n]*\n)(.*)', bygroups(Text, Operator, Text, using(PerlLexer))),
+        (r'(?s)(\s*)(%%prun)([^\n]*\n)(.*)', bygroups(Text, Operator, Text, using(PyLexer))),
+        (r'(?s)(\s*)(%%pypy)([^\n]*\n)(.*)', bygroups(Text, Operator, Text, using(PyLexer))),
+        (r'(?s)(\s*)(%%python)([^\n]*\n)(.*)', bygroups(Text, Operator, Text, using(PyLexer))),
+        (r'(?s)(\s*)(%%python2)([^\n]*\n)(.*)', bygroups(Text, Operator, Text, using(PythonLexer))),
+        (r'(?s)(\s*)(%%python3)([^\n]*\n)(.*)', bygroups(Text, Operator, Text, using(Python3Lexer))),
+        (r'(?s)(\s*)(%%ruby)([^\n]*\n)(.*)', bygroups(Text, Operator, Text, using(RubyLexer))),
+        (r'(?s)(\s*)(%%time)([^\n]*\n)(.*)', bygroups(Text, Operator, Text, using(PyLexer))),
+        (r'(?s)(\s*)(%%timeit)([^\n]*\n)(.*)', bygroups(Text, Operator, Text, using(PyLexer))),
+        (r'(?s)(\s*)(%%writefile)([^\n]*\n)(.*)', bygroups(Text, Operator, Text, using(PyLexer))),
+        (r'(?s)(\s*)(%%file)([^\n]*\n)(.*)', bygroups(Text, Operator, Text, using(PyLexer))),
+        (r"(?s)(\s*)(%%)(\w+)(.*)", bygroups(Text, Operator, Keyword, Text)),
+        (r'(?s)(^\s*)(%%!)([^\n]*\n)(.*)', bygroups(Text, Operator, Text, using(BashLexer))),
+        (r"(%%?)(\w+)(\?\??)$",  bygroups(Operator, Keyword, Operator)),
+        (r"\b(\?\??)(\s*)$",  bygroups(Operator, Text)),
+        (r'(%)(sx|sc|system)(.*)(\n)', bygroups(Operator, Keyword,
+                                                using(BashLexer), Text)),
+        (r'(%)(\w+)(.*\n)', bygroups(Operator, Keyword, Text)),
+        (r'^(!!)(.+)(\n)', bygroups(Operator, using(BashLexer), Text)),
+        (r'(!)(?!=)(.+)(\n)', bygroups(Operator, using(BashLexer), Text)),
+        (r'^(\s*)(\?\??)(\s*%{0,2}[\w\.\*]*)', bygroups(Text, Operator, Text)),
+        (r'(\s*%{0,2}[\w\.\*]*)(\?\??)(\s*)$', bygroups(Text, Operator, Text)),
+    ]
+
+    tokens = PyLexer.tokens.copy()
+    tokens['root'] = ipython_tokens + tokens['root']
+
+    attrs = {'name': name, 'aliases': aliases, 'filenames': [],
+             '__doc__': doc, 'tokens': tokens}
+
+    return type(name, (PyLexer,), attrs)
+
+
+IPython3Lexer = build_ipy_lexer(python3=True)
+IPythonLexer = build_ipy_lexer(python3=False)
 
 
 class IPythonPartialTracebackLexer(RegexLexer):
@@ -222,9 +184,9 b' class IPythonTracebackLexer(DelegatingLexer):'
     this is the line which lists the File and line number.
 
     """
-
-    # The lexer inherits from DelegatingLexer.  The "root" lexer is the
-    # IPython3 lexer. First, we parse with the partial IPython traceback lexer.
+    # The lexer inherits from DelegatingLexer.  The "root" lexer is an
+    # appropriate IPython lexer, which depends on the value of the boolean
+    # `python3`.  First, we parse with the partial IPython traceback lexer.
     # Then, any code marked with the "Other" token is delegated to the root
     # lexer.
     #
@@ -239,9 +201,19 b' class IPythonTracebackLexer(DelegatingLexer):'
         # note we need a __init__ doc, as otherwise it inherits the doc from the super class
         # which will fail the documentation build as it references section of the pygments docs that
         # do not exists when building IPython's docs.
+        self.python3 = get_bool_opt(options, 'python3', False)
+        if self.python3:
+            self.aliases = ['ipython3tb']
+        else:
+            self.aliases = ['ipython2tb', 'ipythontb']
 
-        super().__init__(IPython3Lexer, IPythonPartialTracebackLexer, **options)
+        if self.python3:
+            IPyLexer = IPython3Lexer
+        else:
+            IPyLexer = IPythonLexer
 
+        DelegatingLexer.__init__(self, IPyLexer,
+                                 IPythonPartialTracebackLexer, **options)
 
 class IPythonConsoleLexer(Lexer):
     """
@@ -283,8 +255,8 b' class IPythonConsoleLexer(Lexer):'
     #    continuation = '   .D.: '
     #    template     = 'Out[#]: '
     #
-    # Where '#' is the 'prompt number' or 'execution count' and 'D'
-    # D is a number of dots  matching the width of the execution count
+    # Where '#' is the 'prompt number' or 'execution count' and 'D' 
+    # D is a number of dots  matching the width of the execution count 
     #
     in1_regex = r'In \[[0-9]+\]: '
     in2_regex = r'   \.\.+\.: '
@@ -298,6 +270,9 b' class IPythonConsoleLexer(Lexer):'
 
         Parameters
         ----------
+        python3 : bool
+            If `True`, then the console inputs are parsed using a Python 3
+            lexer. Otherwise, they are parsed using a Python 2 lexer.
         in1_regex : RegexObject
             The compiled regular expression used to detect the start
             of inputs. Although the IPython configuration setting may have a
@@ -313,7 +288,11 b' class IPythonConsoleLexer(Lexer):'
             then the default output prompt is assumed.
 
         """
-        self.aliases = ["ipython3console"]
+        self.python3 = get_bool_opt(options, 'python3', False)
+        if self.python3:
+            self.aliases = ['ipython3console']
+        else:
+            self.aliases = ['ipython2console', 'ipythonconsole']
 
         in1_regex = options.get('in1_regex', self.in1_regex)
         in2_regex = options.get('in2_regex', self.in2_regex)
@@ -339,8 +318,15 b' class IPythonConsoleLexer(Lexer):'
 
         Lexer.__init__(self, **options)
 
-        self.pylexer = IPython3Lexer(**options)
-        self.tblexer = IPythonTracebackLexer(**options)
+        if self.python3:
+            pylexer = IPython3Lexer
+            tblexer = IPythonTracebackLexer
+        else:
+            pylexer = IPythonLexer
+            tblexer = IPythonTracebackLexer
+
+        self.pylexer = pylexer(**options)
+        self.tblexer = tblexer(**options)
 
         self.reset()
 
@@ -526,16 +512,20 b' class IPyLexer(Lexer):'
     def __init__(self, **options):
         """
         Create a new IPyLexer instance which dispatch to either an
-        IPythonConsoleLexer (if In prompts are present) or and IPython3Lexer (if
+        IPythonCOnsoleLexer (if In prompts are present) or and IPythonLexer (if
         In prompts are not present).
         """
         # init docstring is necessary for docs not to fail to build do to parent
         # docs referenceing a section in pygments docs.
-        self.aliases = ["ipy3"]
+        self.python3 = get_bool_opt(options, 'python3', False)
+        if self.python3:
+            self.aliases = ['ipy3']
+        else:
+            self.aliases = ['ipy2', 'ipy']
 
         Lexer.__init__(self, **options)
 
-        self.IPythonLexer = IPython3Lexer(**options)
+        self.IPythonLexer = IPythonLexer(**options)
         self.IPythonConsoleLexer = IPythonConsoleLexer(**options)
 
     def get_tokens_unprocessed(self, text):
@@ -547,3 +537,4 b' class IPyLexer(Lexer):'
             lex = self.IPythonLexer
         for token in lex.get_tokens_unprocessed(text):
             yield token
+

IPython/lib/tests/test_lexers.py

@@ -16,10 +16,10 b' pyg214 = tuple(int(x) for x in pygments_version.split(".")[:2]) >= (2, 14)'
 class TestLexers(TestCase):
     """Collection of lexers tests"""
     def setUp(self):
-        self.lexer = lexers.IPython3Lexer()
+        self.lexer = lexers.IPythonLexer()
         self.bash_lexer = BashLexer()
 
-    def testIPython3Lexer(self):
+    def testIPythonLexer(self):
         fragment = '!echo $HOME\n'
         bash_tokens = [
             (Token.Operator, '!'),

IPython/lib/tests/test_pygments.py

@@ -4,10 +4,12 b' import pytest'
 import pygments.lexers
 import pygments.lexer
 
-from IPython.lib.lexers import IPythonConsoleLexer, IPython3Lexer
+from IPython.lib.lexers import IPythonConsoleLexer, IPythonLexer, IPython3Lexer
 
 #: the human-readable names of the IPython lexers with ``entry_points``
-EXPECTED_LEXER_NAMES = [cls.name for cls in [IPythonConsoleLexer, IPython3Lexer]]
+EXPECTED_LEXER_NAMES = [
+    cls.name for cls in [IPythonConsoleLexer, IPythonLexer, IPython3Lexer]
+]
 
 
 @pytest.fixture

IPython/sphinxext/ipython_console_highlighting.py

@@ -20,5 +20,9 b' def setup(app):'
 # Alternatively, we could register the lexer with pygments instead. This would
 # require using setuptools entrypoints: http://pygments.org/docs/plugins
 
-highlighting.lexers["ipython"] = IPyLexer()
-highlighting.lexers["ipython3"] = IPyLexer()
+ipy2 = IPyLexer(python3=False)
+ipy3 = IPyLexer(python3=True)
+
+highlighting.lexers['ipython'] = ipy2
+highlighting.lexers['ipython2'] = ipy2
+highlighting.lexers['ipython3'] = ipy3

docs/source/development/lexer.rst

@@ -9,20 +9,22 b' The IPython console lexer has been rewritten and now supports tracebacks'
 and customized input/output prompts. An entire suite of lexers is now
 available at :mod:`IPython.lib.lexers`. These include:
 
-IPython3Lexer
-  Lexer for pure IPython  (python 3 + magic/shell commands)
+IPythonLexer & IPython3Lexer
+  Lexers for pure IPython (python + magic/shell commands)
 
 IPythonPartialTracebackLexer & IPythonTracebackLexer
-  The partial traceback lexer reads everything but the Python code
-  appearing in a traceback. The full lexer combines the partial lexer
-  with the IPython3Lexer.
+  Supports 2.x and 3.x via the keyword `python3`. The partial traceback
+  lexer reads everything but the Python code appearing in a traceback.
+  The full lexer combines the partial lexer with an IPython lexer.
 
 IPythonConsoleLexer
-  A lexer for python 3 IPython console sessions, with support for tracebacks.
+  A lexer for IPython console sessions, with support for tracebacks.
+  Supports 2.x and 3.x via the keyword `python3`.
 
 IPyLexer
   A friendly lexer which examines the first line of text and from it,
   decides whether to use an IPython lexer or an IPython console lexer.
+  Supports 2.x and 3.x via the keyword `python3`.
 
 Previously, the :class:`IPythonConsoleLexer` class was available at
 :mod:`IPython.sphinxext.ipython_console_hightlight`.  It was inserted

setup.py

@@ -145,6 +145,7 b' setup_args["entry_points"] = {'
     "console_scripts": find_entry_points(),
     "pygments.lexers": [
         "ipythonconsole = IPython.lib.lexers:IPythonConsoleLexer",
+        "ipython = IPython.lib.lexers:IPythonLexer",
         "ipython3 = IPython.lib.lexers:IPython3Lexer",
     ],
 }