From 62f2e7c112601d5bc7e7f5d042d4fce1e354865e Mon Sep 17 00:00:00 2001
From: Mu Qiao <qiaomuf@gentoo.org>
Date: Thu, 1 Mar 2012 15:51:58 +0800
Subject: Parser: allow empty replacement pattern

---
 bashast/bashast.g              | 3 ++-
 bashast/gunit/param_main.gunit | 3 +++
 scripts/var_expansion.bash     | 5 +++++
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/bashast/bashast.g b/bashast/bashast.g
index 8d627c4..73249ef 100644
--- a/bashast/bashast.g
+++ b/bashast/bashast.g
@@ -879,7 +879,8 @@ parameter_value_operator
 	|	QMARK -> DISPLAY_ERROR_WHEN_UNSET
 	|	PLUS -> USE_ALTERNATE_WHEN_UNSET;
 parameter_replace_pattern
-	:	((~SLASH) => parameter_pattern_part)+ -> ^(STRING parameter_pattern_part+);
+	:	(SLASH) => -> ^(STRING NAME) // Create an empty string
+	|	((~SLASH) => parameter_pattern_part)+ -> ^(STRING parameter_pattern_part+);
 parameter_delete_pattern
 	:	parameter_pattern_part+ -> ^(STRING parameter_pattern_part+);
 parameter_pattern_part
diff --git a/bashast/gunit/param_main.gunit b/bashast/gunit/param_main.gunit
index 01ec853..2168d54 100644
--- a/bashast/gunit/param_main.gunit
+++ b/bashast/gunit/param_main.gunit
@@ -90,6 +90,9 @@ variable_reference:
 "${!#/a/bc}" -> (VAR_REF (REPLACE_FIRST (VAR_REF #) (STRING a) (STRING bc)))
 "${!abc/a/bc}" -> (VAR_REF (REPLACE_FIRST (VAR_REF abc) (STRING a) (STRING bc)))
 "${!123/a/bc}" -> (VAR_REF (REPLACE_FIRST (VAR_REF 123) (STRING a) (STRING bc)))
+"${search_paths/%/${root}}" -> (VAR_REF (REPLACE_AT_END search_paths (STRING NAME) (STRING $ { root })))
+"${search_paths/#/${root}}" -> (VAR_REF (REPLACE_AT_START search_paths (STRING NAME) (STRING $ { root })))
+"${search_paths//${root}}" -> (VAR_REF (REPLACE_ALL search_paths (STRING (VAR_REF root))))
 
 variable_definition_atom:
 "MY_PN=${PN/asterisk-}" -> (= MY_PN (STRING (VAR_REF (REPLACE_FIRST PN (STRING asterisk -)))))
diff --git a/scripts/var_expansion.bash b/scripts/var_expansion.bash
index 5f0bfca..e78ac8f 100644
--- a/scripts/var_expansion.bash
+++ b/scripts/var_expansion.bash
@@ -130,6 +130,11 @@ foo=
 unset bar
 echo ${bar=abc}
 
+search_paths="a%#b"
+root=123
+echo "${search_paths/%/${root}}"
+echo "${search_paths/#/${root}}"
+
 # This regular expression will cause boost::exception_detail::clone_impl<boost::xpressive::regex_error>
 #[[ "${version_components_groups}" =~ ("*".*" "|" *"|^2.*\ (2|\*)|^3.*\ (3|\*)) ]]
 [[ " ${FUNCNAME[@]:2} " =~ " "(_python_final_sanity_checks|python_execute_function|python_mod_optimize|python_mod_cleanup)" " ]]
-- 
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