Minor fixes (#199)

* Fix sprites (Bright)

* Add support for coalesce expression

* Fix missing building in Streets

* Revert Fix missing building in Streets

gl2qgis/gl2qgis.py

@@ -247,7 +247,7 @@ def parse_fill_layer(json_layer, context):
         sprite_size = QSize()
         sprite_property = ""
         sprite_size_property = ""
-        sprite = core_converter.retrieveSpriteAsBase64(json_fill_patern, context, sprite_size, sprite_property, sprite_size_property)
+        sprite = core_converter.retrieveSpriteAsBase64(json_fill_patern, context)
 
         if sprite:
             # when fill-pattern exists, set and insert QgsRasterFillSymbolLayer
@@ -1161,6 +1161,12 @@ def parse_case(json_list: list, context: QgsMapBoxGlStyleConversionContext):
     return case_str
 
 
+def parse_coalesce(json_list: list, context: QgsMapBoxGlStyleConversionContext):
+    coalesce_items = list(map(parse_expression, json_list[1:], repeat(context)))
+    coalesce_str = f"COALESCE({','.join(coalesce_items)})"
+    return coalesce_str
+
+
 def parse_array_stops(stops: list, multiplier: (int, float)):
     if len(stops) < 2:
         return
@@ -1494,6 +1500,8 @@ def parse_expression(json_expr, context):
         return parse_concat(json_expr, context)
     elif op == "case":
         return parse_case(json_expr, context)
+    elif op == "coalesce":
+        return parse_coalesce(json_expr, context)
     else:
         context.pushWarning(f"{context.layerId()}: Skipping unsupported expression.")
         return