[gentoo-commits] proj/libbash:master commit in: bashast/, bashast/gunit/

["Petteri Räty" <betelgeuse@gentoo.org>]

commit:     c5a116f1794e061ea10335b12c6889676d92136b
Author:     Mu Qiao <qiaomuf <AT> gentoo <DOT> org>
AuthorDate: Thu Jul 21 09:08:33 2011 +0000
Commit:     Petteri Räty <betelgeuse <AT> gentoo <DOT> org>
CommitDate: Tue Aug  2 07:46:29 2011 +0000
URL:        http://git.overlays.gentoo.org/gitweb/?p=proj/libbash.git;a=commit;h=c5a116f1

Parser: allow empty value for sub-array expansion

Expansion like ${var::3} is allowed now.

---
 bashast/bashast.g              |    9 +++++++--
 bashast/gunit/param_main.gunit |    1 +
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/bashast/bashast.g b/bashast/bashast.g
index 14d7d10..7bb8a8b 100644
--- a/bashast/bashast.g
+++ b/bashast/bashast.g
@@ -724,8 +724,13 @@ parameter_expansion
 		(
 			(parameter_value_operator) => parameter_value_operator parameter_expansion_value
 				-> ^(parameter_value_operator variable_name parameter_expansion_value)
-			|	COLON BLANK? os=explicit_arithmetic (COLON BLANK? len=explicit_arithmetic)?
-				-> ^(OFFSET variable_name $os ^($len)?)
+			|	COLON BLANK?
+				(
+					os=explicit_arithmetic (COLON BLANK? len=explicit_arithmetic)?
+						-> ^(OFFSET variable_name $os ^($len)?)
+					|	COLON BLANK? len=explicit_arithmetic
+						-> ^(OFFSET variable_name NUMBER["0"] ^($len)?)
+				)
 			|	parameter_delete_operator parameter_delete_pattern
 				-> ^(parameter_delete_operator variable_name parameter_delete_pattern)
 			|	parameter_replace_operator parameter_replace_pattern (SLASH parameter_expansion_value)?

diff --git a/bashast/gunit/param_main.gunit b/bashast/gunit/param_main.gunit
index 677b566..306d3c6 100644
--- a/bashast/gunit/param_main.gunit
+++ b/bashast/gunit/param_main.gunit
@@ -29,6 +29,7 @@ variable_reference:
 "${bar: -10}" -> (VAR_REF (OFFSET bar (MINUS_SIGN 10)))
 "${bar:(-10 + 5)}" -> (VAR_REF (OFFSET bar (+ (MINUS_SIGN 10) 5)))
 "${foo:5:2}" -> (VAR_REF (OFFSET foo 5 2))
+"${foo::2}" -> (VAR_REF (OFFSET foo 0 2))
 "${foo:$((5)):$((2))}" -> (VAR_REF (OFFSET foo 5 2))
 "${!asdf*}" -> (VAR_REF (! asdf *))
 "${!asdf@}" -> (VAR_REF (! asdf @))