From f9913f4422d1317af3c6b5aff37ad18b78083eb5 Mon Sep 17 00:00:00 2001
From: Shea Levy <shea@shealevy.com>
Date: Mon, 6 Jan 2014 10:27:26 -0500
Subject: [PATCH] Allow "bare" dynamic attrs

Now, in addition to a."${b}".c, you can write a.${b}.c (applicable
wherever dynamic attributes are valid).

Signed-off-by: Shea Levy <shea@shealevy.com>
---
 src/libexpr/lexer.l                         |  2 ++
 src/libexpr/parser.y                        |  1 +
 tests/lang/eval-okay-dynamic-attrs-bare.exp |  1 +
 tests/lang/eval-okay-dynamic-attrs-bare.nix | 17 +++++++++++++++++
 4 files changed, 21 insertions(+)
 create mode 100644 tests/lang/eval-okay-dynamic-attrs-bare.exp
 create mode 100644 tests/lang/eval-okay-dynamic-attrs-bare.nix

diff --git a/src/libexpr/lexer.l b/src/libexpr/lexer.l
index 5d036040..911850cc 100644
--- a/src/libexpr/lexer.l
+++ b/src/libexpr/lexer.l
@@ -117,6 +117,8 @@ or          { return OR_KW; }
               return INT;
             }
 
+\$\{        { return DOLLAR_CURLY; }
+
 \"          { BEGIN(STRING); return '"'; }
 <STRING>([^\$\"\\]|\$[^\{\"]|\\.)+ {
               /* !!! Not quite right: we want a follow restriction on
diff --git a/src/libexpr/parser.y b/src/libexpr/parser.y
index 28972cf7..23058438 100644
--- a/src/libexpr/parser.y
+++ b/src/libexpr/parser.y
@@ -509,6 +509,7 @@ attr
 
 string_attr
   : '"' string_parts '"' { $$ = $2; }
+  | DOLLAR_CURLY expr '}' { $$ = $2; }
   ;
 
 expr_list
diff --git a/tests/lang/eval-okay-dynamic-attrs-bare.exp b/tests/lang/eval-okay-dynamic-attrs-bare.exp
new file mode 100644
index 00000000..df8750af
--- /dev/null
+++ b/tests/lang/eval-okay-dynamic-attrs-bare.exp
@@ -0,0 +1 @@
+{ binds = true; hasAttrs = true; multiAttrs = true; recBinds = true; selectAttrs = true; selectOrAttrs = true; }
diff --git a/tests/lang/eval-okay-dynamic-attrs-bare.nix b/tests/lang/eval-okay-dynamic-attrs-bare.nix
new file mode 100644
index 00000000..0dbe15e6
--- /dev/null
+++ b/tests/lang/eval-okay-dynamic-attrs-bare.nix
@@ -0,0 +1,17 @@
+let
+  aString = "a";
+
+  bString = "b";
+in {
+  hasAttrs = { a.b = null; } ? ${aString}.b;
+
+  selectAttrs = { a.b = true; }.a.${bString};
+
+  selectOrAttrs = { }.${aString} or true;
+
+  binds = { ${aString}."${bString}c" = true; }.a.bc;
+
+  recBinds = rec { ${bString} = a; a = true; }.b;
+
+  multiAttrs = { ${aString} = true; ${bString} = false; }.a;
+}