Working on mixin content.

Author: Aaron Leung

constants.cpp

@@ -12,6 +12,7 @@ namespace Sass {
     extern const char function_kwd[]      = "@function";
     extern const char return_kwd[]        = "@return";
     extern const char include_kwd[]       = "@include";
+    extern const char content_kwd[]       = "@content";
     extern const char extend_kwd[]        = "@extend";
     extern const char if_kwd[]            = "@if";
     extern const char else_kwd[]          = "@else";

constants.hpp

@@ -12,6 +12,7 @@ namespace Sass {
     extern const char function_kwd[];
     extern const char return_kwd[];
     extern const char include_kwd[];
+    extern const char content_kwd[];
     extern const char extend_kwd[];
     extern const char if_kwd[];
     extern const char else_kwd[];

document.hpp

@@ -133,7 +133,7 @@ namespace Sass {
     Node parse_function_definition();
     Node parse_parameters();
     Node parse_parameter(Node::Type);
-    Node parse_mixin_call();
+    Node parse_mixin_call(Node::Type inside_of = Node::none);
     Node parse_arguments();
     Node parse_argument(Node::Type);
     Node parse_assignment();

document_parser.cpp

@@ -26,7 +26,7 @@ namespace Sass {
         else                                     root += importee;
         if (!lex< exactly<';'> >()) throw_syntax_error("top-level @import directive must be terminated by ';'");
       }
-      else if (peek< mixin >() || peek< exactly<'='> >()) {
+      else if (peek< mixin >() /* || peek< exactly<'='> >() */) {
         root << parse_mixin_definition();
       }
       else if (peek< function >()) {
@@ -42,9 +42,10 @@ namespace Sass {
       else if ((lookahead_result = lookahead_for_selector(position)).found) {
         root << parse_ruleset(lookahead_result);
       }
-      else if (peek< include >() || peek< exactly<'+'> >()) {
-        root << parse_mixin_call();
-        if (!lex< exactly<';'> >()) throw_syntax_error("top-level @include directive must be terminated by ';'");
+      else if (peek< include >() /* || peek< exactly<'+'> >() */) {
+        Node mixin_call(parse_mixin_call());
+        root << mixin_call;
+        if (mixin_call.size() < 3 && !lex< exactly<';'> >()) throw_syntax_error("top-level @include directive must be terminated by ';'");
       }
       else if (peek< if_directive >()) {
         root << parse_if_directive(Node(), Node::none);
@@ -138,7 +139,7 @@ namespace Sass {
 
   Node Document::parse_mixin_definition()
   {
-    lex< mixin >() || lex< exactly<'='> >();
+    lex< mixin >() /* || lex< exactly<'='> >() */;
     if (!lex< identifier >()) throw_syntax_error("invalid name in @mixin directive");
     Node name(context.new_Node(Node::identifier, path, line, lexed));
     Node params(parse_parameters());
@@ -210,14 +211,21 @@ namespace Sass {
     return var;
   }
 
-  Node Document::parse_mixin_call()
+  Node Document::parse_mixin_call(Node::Type inside_of)
   {
-    lex< include >() || lex< exactly<'+'> >();
+    lex< include >() /* || lex< exactly<'+'> >() */;
     if (!lex< identifier >()) throw_syntax_error("invalid name in @include directive");
     Node name(context.new_Node(Node::identifier, path, line, lexed));
     Node args(parse_arguments());
-    Node the_call(context.new_Node(Node::mixin_call, path, line, 2));
+    Node content;
+    bool has_content = false;
+    if (peek< exactly<'{'> >()) {
+      content = parse_block(Node(), inside_of);
+      has_content = true;
+    }
+    Node the_call(context.new_Node(Node::mixin_call, path, line, has_content ? 3 : 2));
     the_call << name << args;
+    if (has_content) the_call << content;
     return the_call;
   }
 
@@ -596,16 +604,25 @@ namespace Sass {
         block << parse_mixin_call();
         semicolon = true;
       }
+      else if (peek< content >(position)) {
+        if (inside_of != Node::mixin) {
+          throw_syntax_error("@content may only be used within a mixin");
+        }
+        block << context.new_Node(Node::mixin_content, path, line, Token::make()); // just a stub
+        semicolon = true;
+      }
       else if (peek< sequence< identifier, optional_spaces, exactly<':'>, optional_spaces, exactly<'{'> > >(position)) {
         block << parse_propset();
       }
       else if ((lookahead_result = lookahead_for_selector(position)).found) {
         block << parse_ruleset(lookahead_result, inside_of);
       }
+      /*
       else if (peek< exactly<'+'> >()) {
         block << parse_mixin_call();
         semicolon = true;
       }
+      */
       else if (lex< extend >()) {
         Node request(context.new_Node(Node::extend_directive, path, line, 1));
         Selector_Lookahead lookahead = lookahead_for_extension_target(position);

node.hpp

@@ -154,6 +154,7 @@ namespace Sass {
       function_call,
       mixin,
       mixin_call,
+      mixin_content,
       parameters,
       arguments,
 

prelexer.cpp

@@ -138,6 +138,10 @@ namespace Sass {
       return exactly<include_kwd>(src);
     }
 
+    const char* content(const char* src) {
+      return exactly<content_kwd>(src);
+    }
+
     const char* extend(const char* src) {
       return exactly<extend_kwd>(src);
     }

prelexer.hpp

@@ -317,6 +317,7 @@ namespace Sass {
     const char* function(const char* src);
     const char* return_directive(const char* src);
     const char* include(const char* src);
+    const char* content(const char* src);
     const char* extend(const char* src);
 
     const char* if_directive(const char* src);