Impplement operator highlighting

Fixes #7
Closes #9

README.md

@@ -67,6 +67,7 @@ let g:python_highlight_all = 1
 | `g:python_highlight_space_errors`             | Highlight trailing spaces                                      | `0`     |
 | `g:python_highlight_doctests`                 | Highlight doc-tests                                            | `0`     |
 | `g:python_highlight_class_vars`               | Highlight class variables `self` and `cls`                     | `0`     |
+| `g:python_highlight_operators`                | Highlight all operators                                        | `0`     |
 | `g:python_highlight_all`                      | Enable all highlight options above, except for previously set. | `0`     |
 | `g:python_highlight_file_headers_as_comments` | Highlight shebang and coding headers as comments               | `0`     |
 | `g:python_slow_sync`                          | Disable for slow machines                                      | `1`     |

doc/python-syntax.txt

@@ -86,6 +86,9 @@ following command to your `~/.config/nvim/init.vim` or `~/.vimrc`: >
 `g:python_highlight_class_vars` (default `0`)
     Highlight class variables `self` and `cls`
 
+`g:python_highlight_operators` (default `0`)
+    Highlight all operators
+
 `g:python_highlight_all` (default `0`)
     Enable all highlight options above, except for previously set.
 

syntax/python.vim

@@ -53,6 +53,7 @@ if s:Enabled('g:python_highlight_all')
   call s:EnableByDefault('g:python_highlight_doctests')
   call s:EnableByDefault('g:python_print_as_function')
   call s:EnableByDefault('g:python_highlight_class_vars')
+  call s:EnableByDefault('g:python_highlight_operators')
 endif
 
 "
@@ -73,7 +74,6 @@ endif
 syn keyword pythonRepeat        for while
 syn keyword pythonConditional   if elif else
 syn keyword pythonException     try except finally
-syn keyword pythonOperator      and in is not or
 " The standard pyrex.vim unconditionally removes the pythonInclude group, so
 " we provide a dummy group here to avoid crashing pyrex.vim.
 syn keyword pythonInclude       import
@@ -83,7 +83,6 @@ syn match pythonRaiseFromStatement      '\<from\>'
 syn match pythonImport          '^\s*\zsfrom\>'
 
 
-
 if s:Python2Syntax()
   if !s:Enabled('g:python_print_as_function')
     syn keyword pythonStatement  print
@@ -100,6 +99,16 @@ else
   syn cluster pythonExpression contains=pythonStatement,pythonRepeat,pythonConditional,pythonOperator,pythonNumber,pythonHexNumber,pythonOctNumber,pythonBinNumber,pythonFloat,pythonString,pythonBytes,pythonBoolean,pythonBuiltinObj,pythonBuiltinFunc
 endif
 
+
+"
+" Operators
+"
+syn keyword pythonOperator      and in is not or
+if s:Enabled('g:python_highlight_operators')
+    syn match pythonOperator        '\V=\|-\|+\|*\|@\|/\|%\|&\||\|^\|~\|<\|>\|!='
+endif
+syn match pythonError           '[$?]\|\([-+@%&|^~]\)\1\{1,}\|\([=*/<>]\)\2\{2,}\|\([-=+*@/%&|^~<>]\)\3\@![-+*@/%&|^~<>]\|[<!>]\+=\{2,}\|[<!>]\{2,}=\+' display
+
 "
 " Decorators (new in Python 2.4)
 "
@@ -127,10 +136,7 @@ syn keyword pythonTodo          TODO FIXME XXX contained
 " Errors
 "
 
-syn match pythonError           '\<\d\+\D\+\>' display
-syn match pythonError           '[$?]' display
-syn match pythonError           '[&|]\{2,}' display
-syn match pythonError           '[=]\{3,}' display
+syn match pythonError           '\<\d\+[^0-9[:space:]]\+\>' display
 
 " Mixing spaces and tabs also may be used for pretty formatting multiline
 " statements

tests/test.py

@@ -9,7 +9,7 @@
 # Keywords.
 
 with break continue del exec return pass print raise global assert lambda yield
-for while if elif else import as try except finally and in is not or
+for while if elif else import as try except finally
 
 from test import var as name
 
@@ -66,6 +66,23 @@ RuntimeWarning FutureWarning ImportWarning UnicodeWarning
 @ декоратор
 @ декоратор.décorateur
 
+# Operators
+
+and or in is not
+=
+- + * ** @ / // %
+& | ^ ~ << >>
+< <= == != >= >
+
+# Erroneous operators
+
+$ ?
+===
+-- ++ *** @@ /// %%
+&& || ^^ ~~ <<< >>>
+<== <<= !== !!= >== >>=
+%- +- -+
+
 # Numbers
 
 0 1 2 9 10 0x1f .3 12.34 0j 124j 34.2E-3 0b10 0o77 1023434 0x0
@@ -141,11 +158,10 @@ f"hello {expr:.2f} yes {(lambda: 0b1)():#03x} lol {var!r}"
     Test
 '''
 
-# Erroneous symbols or bad variable names.
+# Erroneous variable names
 
-$ ? 6xav
+6xav
 
-&& || ===
 
 # Indentation errors.