Merge pull request sass#706 from mgreter/feature/inspect-function

Implement inspect function (Fix sass#701)

context.cpp

@@ -467,6 +467,7 @@ namespace Sass {
     // Path Functions
     register_function(ctx, image_url_sig, image_url, env);
     // Misc Functions
+    register_function(ctx, inspect_sig, inspect, env);
     register_function(ctx, unique_id_sig, unique_id, env);
   }
 

functions.cpp

@@ -1481,6 +1481,18 @@ namespace Sass {
     // MISCELLANEOUS FUNCTIONS
     //////////////////////////
 
+    Signature inspect_sig = "inspect($value)";
+    BUILT_IN(inspect)
+    {
+      Expression* v = ARG("$value", Expression);
+      if (v->concrete_type() == Expression::NULL_VAL) {
+        return new (ctx.mem) String_Constant(path, position, "null");
+      } else if (v->concrete_type() == Expression::BOOLEAN && *v == 0) {
+        return new (ctx.mem) String_Constant(path, position, "false");
+      }
+      return v;
+    }
+
     Signature unique_id_sig = "unique-id()";
     BUILT_IN(unique_id)
     {

functions.hpp

@@ -75,6 +75,7 @@ namespace Sass {
     extern Signature abs_sig;
     extern Signature min_sig;
     extern Signature max_sig;
+    extern Signature inspect_sig;
     extern Signature random_sig;
     extern Signature length_sig;
     extern Signature nth_sig;
@@ -148,6 +149,7 @@ namespace Sass {
     BUILT_IN(abs);
     BUILT_IN(min);
     BUILT_IN(max);
+    BUILT_IN(inspect);
     BUILT_IN(random);
     BUILT_IN(length);
     BUILT_IN(nth);

inspect.cpp

@@ -232,6 +232,24 @@ namespace Sass {
     append_to_buffer("@content;");
   }
 
+  void Inspect::operator()(Map* map)
+  {
+    if (map->empty()) return;
+    if (map->is_invisible()) return;
+    bool items_output = false;
+    append_to_buffer("(");
+    for (auto key : map->keys()) {
+      if (key->is_invisible()) continue;
+      if (map->at(key)->is_invisible()) continue;
+      if (items_output) append_to_buffer(", ");
+      key->perform(this);
+      append_to_buffer(": ");
+      map->at(key)->perform(this);
+      items_output = true;
+    }
+    append_to_buffer(")");
+  }
+
   void Inspect::operator()(List* list)
   {
     string sep(list->separator() == List::SPACE ? " " : ", ");

inspect.hpp

@@ -59,6 +59,7 @@ namespace Sass {
     virtual void operator()(Mixin_Call*);
     virtual void operator()(Content*);
     // expressions
+    virtual void operator()(Map*);
     virtual void operator()(List*);
     virtual void operator()(Binary_Expression*);
     virtual void operator()(Unary_Expression*);