From e9c584b427fcb3f0320b0827ecab5c9a485f1fe2 Mon Sep 17 00:00:00 2001
From: Marcel Greter <marcel.greter@ocbnet.ch>
Date: Sun, 21 May 2017 01:41:06 +0200
Subject: [PATCH] Improve selector and binominal look ahead (#2346)

Make more permissive and allow spaces around dashes.
---
 src/prelexer.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/prelexer.cpp b/src/prelexer.cpp
index 8790d2c3f..ba924fd9b 100644
--- a/src/prelexer.cpp
+++ b/src/prelexer.cpp
@@ -1600,7 +1600,7 @@ namespace Sass {
             class_char < selector_lookahead_ops >,
             // match selector combinators /[>+~]/
             class_char < selector_combinator_ops >,
-            // match attribute compare operators
+            // match pseudo selectors
             sequence <
               exactly <'('>,
               optional_spaces,
@@ -1608,6 +1608,7 @@ namespace Sass {
               optional_spaces,
               exactly <')'>
             >,
+            // match attribute compare operators
             alternatives <
               exact_match, class_match, dash_match,
               prefix_match, suffix_match, substring_match
@@ -1635,7 +1636,12 @@ namespace Sass {
               // accept hypens in token
               one_plus < sequence <
                 // can start with hyphens
-                zero_plus < exactly<'-'> >,
+                zero_plus <
+                  sequence <
+                    exactly <'-'>,
+                    optional_spaces
+                  >
+                >,
                 // now the main token
                 alternatives <
                   kwd_optional,