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authorEelco Dolstra <e.dolstra@tudelft.nl>2004-02-04T17·23+0000
committerEelco Dolstra <e.dolstra@tudelft.nl>2004-02-04T17·23+0000
commitd445da7a7b3cbb4822bcad3904a36f0d914917d3 (patch)
treea44ad1a7ba4679dc49ff9d2197c13e27ae00a3b0 /src/libexpr/parser.y
parent9d25466b34a5f7c1c8b1c273976cf59c33961a6c (diff)
* Extended the `inherit' syntax to optionally select attributes from
  other attribute sets, rather than the current scope.  E.g.,
  
    {inherit (pkgs) gcc binutils;}

  is equivalent to

    {gcc = pkgs.gcc; binutils = pkgs.binutils;}

  I am not so happy about the syntax.

Diffstat (limited to 'src/libexpr/parser.y')
-rw-r--r--src/libexpr/parser.y11
1 files changed, 8 insertions, 3 deletions
diff --git a/src/libexpr/parser.y b/src/libexpr/parser.y
index 6c0fdbda25f3..257c0cd38ab2 100644
--- a/src/libexpr/parser.y
+++ b/src/libexpr/parser.y
@@ -33,7 +33,7 @@ void yyerror(YYLTYPE * loc, yyscan_t scanner, void * data, char * s)
 }
 
 %type <t> start expr expr_function expr_assert expr_op
-%type <t> expr_app expr_select expr_simple bind formal
+%type <t> expr_app expr_select expr_simple bind inheritsrc formal
 %type <ts> binds ids expr_list formals
 %token <t> ID INT STR PATH URI
 %token IF THEN ELSE ASSERT LET REC INHERIT EQ NEQ AND OR IMPL
@@ -114,8 +114,13 @@ binds
 bind
   : ID '=' expr ';'
     { $$ = ATmake("Bind(<term>, <term>)", $1, $3); }
-  | INHERIT ids ';'
-    { $$ = ATmake("Inherit(<term>)", $2); }
+  | INHERIT inheritsrc ids ';'
+    { $$ = ATmake("Inherit(<term>, <term>)", $2, $3); }
+  ;
+
+inheritsrc
+  : '(' expr ')' { $$ = $2; }
+  | { $$ = ATmake("Scope"); }
   ;
 
 ids: ids ID { $$ = ATinsert($1, $2); } | { $$ = ATempty; };