[osh] Implement ${a[@]@p}

osh/word_eval.py

@@ -1057,13 +1057,31 @@ def _Nullary(self, val, op, var_name, vsub_token, vsub_state):
             UP_val = val
             with tagswitch(val) as case:
                 if case(value_e.Undef):
-                    result = value.Str('')
+                    result = value.Str('')  # type: value_t
                 elif case(value_e.Str):
                     str_val = cast(value.Str, UP_val)
                     prompt = self.prompt_ev.EvalPrompt(str_val.s)
                     # readline gets rid of these, so we should too.
                     p = prompt.replace('\x01', '').replace('\x02', '')
                     result = value.Str(p)
+                elif case(value_e.BashArray, value_e.BashAssoc):
+                    if val.tag() == value_e.BashArray:
+                        val = cast(value.BashArray, UP_val)
+                        values = [
+                            s for s in bash_impl.BashArray_GetValues(val)
+                            if s is not None
+                        ]
+                    elif val.tag() == value_e.BashAssoc:
+                        val = cast(value.BashAssoc, UP_val)
+                        values = bash_impl.BashAssoc_GetValues(val)
+                    else:
+                        raise AssertionError()
+
+                    tmp = [
+                        self.prompt_ev.EvalPrompt(s).replace(
+                            '\x01', '').replace('\x02', '') for s in values
+                    ]
+                    result = value.BashArray(tmp)
                 else:
                     e_die("Can't use @P on %s" % ui.ValType(val), op)
 

spec/var-op-bash.test.sh

@@ -300,7 +300,8 @@ status=0
 status=0
 ## END
 ## OK osh STDOUT:
-status=1
+a b c
+status=0
 a $'b\\nc'
 status=0
 a a a
@@ -328,7 +329,8 @@ A - A
 status=0
 ## END
 ## OK osh STDOUT:
-status=1
+- y
+status=0
 - y
 status=0
 A - A