Allow for CSS variable in pygments stylesheets

2 files changed, 11 insertions, 4 deletions

diff --git a/pygments/formatters/html.py b/pygments/formatters/html.py
index 7d7605eb..bbddf507 100644
--- a/pygments/formatters/html.py
+++ b/pygments/formatters/html.py
@@ -41,6 +41,11 @@ def escape_html(text, table=_escape_html_table):
     """Escape &, <, > as well as single and double quotes for HTML."""
     return text.translate(table)
 
+def webify(color):
+    if color.startswith('calc') or color.startswith('var'):
+        return color
+    else:
+        return '#' + color
 
 def _get_ttype_class(ttype):
     fname = STANDARD_TYPES.get(ttype)
@@ -451,7 +456,7 @@ class HtmlFormatter(Formatter):
             name = self._get_css_class(ttype)
             style = ''
             if ndef['color']:
-                style += 'color: #%s; ' % ndef['color']
+                style += 'color: %s; ' % webify(ndef['color'])
             if ndef['bold']:
                 style += 'font-weight: bold; '
             if ndef['italic']:
@@ -459,9 +464,9 @@ class HtmlFormatter(Formatter):
             if ndef['underline']:
                 style += 'text-decoration: underline; '
             if ndef['bgcolor']:
-                style += 'background-color: #%s; ' % ndef['bgcolor']
+                style += 'background-color: %s; ' % webify(ndef['bgcolor'])
             if ndef['border']:
-                style += 'border: 1px solid #%s; ' % ndef['border']
+                style += 'border: 1px solid %s; ' % webify(ndef['border'])
             if style:
                 t2c[ttype] = name
                 # save len(ttype) to enable ordering the styles by
diff --git a/pygments/style.py b/pygments/style.py
index 89766d8c..aee23f96 100644
--- a/pygments/style.py
+++ b/pygments/style.py
@@ -73,9 +73,11 @@ class StyleMeta(type):
                 if len(col) == 6:
                     return col
                 elif len(col) == 3:
-                    return col[0]*2 + col[1]*2 + col[2]*2
+                    return col[0] * 2 + col[1] * 2 + col[2] * 2
             elif text == '':
                 return ''
+            elif text.startswith('var') or text.startswith('calc'):
+                return text
             assert False, "wrong color format %r" % text
 
         _styles = obj._styles = {}