Support indefinite and definite uncertain ranges, and unbalanced unce…

…rtain ranges, for g. expressions

src/hgvs/_data/hgvs.pymeta

@@ -122,7 +122,7 @@ pro_ident  = '='                             -> hgvs.edit.AARefAlt(ref='',alt=''
 
 # potentially indefinite/uncertain intervals
 c_interval = def_c_interval | '(' def_c_interval:iv ')' -> iv._set_uncertain()
-g_interval = def_g_interval | '(' def_g_interval:iv ')' -> iv._set_uncertain()
+g_interval = def_g_uncertain_interval:iv | ('(' def_g_interval:iv ')' -> iv._set_uncertain()) | def_g_interval
 m_interval = def_m_interval | '(' def_m_interval:iv ')' -> iv._set_uncertain()
 n_interval = def_n_interval | '(' def_n_interval:iv ')' -> iv._set_uncertain()
 p_interval = def_p_interval | '(' def_p_interval:iv ')' -> iv._set_uncertain()
@@ -136,6 +136,11 @@ def_r_interval = (r_pos:start '_' r_pos:end -> hgvs.location.Interval(start,end)
 def_c_interval = (c_pos:start '_' c_pos:end -> hgvs.location.BaseOffsetInterval(start,end)) | (c_pos:start -> hgvs.location.BaseOffsetInterval(start,copy.deepcopy(start)))
 def_n_interval = (n_pos:start '_' n_pos:end -> hgvs.location.BaseOffsetInterval(start,end)) | (n_pos:start -> hgvs.location.BaseOffsetInterval(start,copy.deepcopy(start)))
 
+# indefinite ranges
+def_g_uncertain_interval = '(' def_g_interval:ivl_start ')' '_' '(' def_g_interval:ivl_end ')' -> hgvs.location.Interval(start=ivl_start._set_uncertain(), end=ivl_end._set_uncertain())
+                        | def_g_interval:ivl_start '_' '(' def_g_interval:ivl_end ')' -> hgvs.location.Interval(start=ivl_start._set_uncertain(), end=ivl_end._set_uncertain())
+                        | '(' def_g_interval:ivl_start ')' '_' def_g_interval:ivl_end -> hgvs.location.Interval(start=ivl_start._set_uncertain(), end=ivl_end._set_uncertain())
+
 # positions
 c_pos = def_c_pos #| '(' def_c_pos:pos ')' -> pos._set_uncertain()
 g_pos = def_g_pos #| '(' def_g_pos:pos ')' -> pos._set_uncertain()