def EvalLhs(node, arith_ev, mem, exec_opts):
"""Evaluate the operand for a++ a[0]++ as an R-value.
Used by Executor as well.
Args:
node: osh_ast.lhs_expr
Returns:
runtime.value, runtime.lvalue
"""
#log('lhs_expr NODE %s', node)
assert isinstance(node, ast.lhs_expr), node
if node.tag == lhs_expr_e.LhsName: # a = b
# Problem: It can't be an array?
# a=(1 2)
# (( a++ ))
lval = runtime.LhsName(node.name)
val = _LookupVar(node.name, mem, exec_opts)
elif node.tag == lhs_expr_e.LhsIndexedName: # a[1] = b
# See tdop.IsIndexable for valid values:
# - ArithVarRef (not LhsName): a[1]
# - FuncCall: f(x), 1
# - ArithBinary LBracket: f[1][1] -- no semantics for this?
index = arith_ev.Eval(node.index)
lval = runtime.LhsIndexedName(node.name, index)
val = mem.GetVar(node.name)
if val.tag == value_e.Str:
e_die("Can't assign to characters of string %r", node.name)
elif val.tag == value_e.Undef:
# It would make more sense for 'nounset' to control this, but bash
# doesn't work that way.
#if self.exec_opts.strict_arith:
# e_die('Undefined array %r', node.name) # TODO: error location
val = runtime.Str('')
elif val.tag == value_e.StrArray:
#log('ARRAY %s -> %s, index %d', node.name, array, index)
array = val.strs
# NOTE: Similar logic in RHS Arith_LBracket
try:
item = array[index]
except IndexError:
item = None
if item is None:
val = runtime.Str('')
else:
assert isinstance(item, str), item
val = runtime.Str(item)
else:
raise AssertionError(val.tag)
else:
raise AssertionError(node.tag)
return val, lval
def testUnset(self):
mem = _InitMem()
# unset a
mem.Unset(runtime.LhsName('a'), scope_e.Dynamic)
return # not implemented yet
# unset a[1]
mem.Unset(runtime.LhsIndexedName('a', 1), scope_e.Dynamic)
def _EvalLhs(self, node, spid):
"""lhs_expr -> lvalue."""
assert isinstance(node, ast.lhs_expr), node
if node.tag == lhs_expr_e.LhsName: # a=x
node = runtime.LhsName(node.name)
node.spids.append(spid)
return node
if node.tag == lhs_expr_e.LhsIndexedName: # a[1+2]=x
i = self.arith_ev.Eval(node.index)
return runtime.LhsIndexedName(node.name, i)
raise AssertionError(node.tag)
def _EvalLhs(self, node, spid, lookup_mode):
"""lhs_expr -> lvalue."""
assert isinstance(node, ast.lhs_expr), node
if node.tag == lhs_expr_e.LhsName: # a=x
lval = runtime.LhsName(node.name)
lval.spids.append(spid)
return lval
if node.tag == lhs_expr_e.LhsIndexedName: # a[1+2]=x
# The index of StrArray needs to be coerced to int, but not the index of
# an AssocArray.
int_coerce = not self.mem.IsAssocArray(node.name, lookup_mode)
index = self.arith_ev.Eval(node.index, int_coerce=int_coerce)
lval = runtime.LhsIndexedName(node.name, index)
lval.spids.append(node.spids[0]) # copy left-most token over
return lval
raise AssertionError(node.tag)
def _EvalLhsArith(self, node):
"""lhs_expr -> lvalue.
Very similar to _EvalLhs in core/cmd_exec."""
assert isinstance(node, ast.lhs_expr), node
if node.tag == lhs_expr_e.LhsName: # (( i = 42 ))
lval = runtime.LhsName(node.name)
# TODO: location info. Use the = token?
#lval.spids.append(spid)
return lval
if node.tag == lhs_expr_e.LhsIndexedName: # (( a[42] = 42 ))
# The index of StrArray needs to be coerced to int, but not the index of
# an AssocArray.
int_coerce = not self.mem.IsAssocArray(node.name, scope_e.Dynamic)
index = self.Eval(node.index, int_coerce=int_coerce)
lval = runtime.LhsIndexedName(node.name, index)
# TODO: location info. Use the = token?
#lval.spids.append(node.spids[0])
return lval
raise AssertionError(node.tag)
def testSetVarClearFlag(self):
mem = _InitMem()
print(mem)
mem.PushCall('my-func', ['ONE'])
self.assertEqual(2, len(mem.var_stack)) # internal details
# local x=y
mem.SetVar(runtime.LhsName('x'), runtime.Str('y'), (),
scope_e.LocalOnly)
self.assertEqual('y', mem.var_stack[-1].vars['x'].val.s)
# New frame
mem.PushCall('my-func', ['TWO'])
self.assertEqual(3, len(mem.var_stack)) # internal details
# x=y -- test out dynamic scope
mem.SetVar(runtime.LhsName('x'), runtime.Str('YYY'), (),
scope_e.Dynamic)
self.assertEqual('YYY', mem.var_stack[-2].vars['x'].val.s)
self.assertEqual(None, mem.var_stack[-1].vars.get('x'))
# myglobal=g
mem.SetVar(runtime.LhsName('myglobal'), runtime.Str('g'), (),
scope_e.Dynamic)
self.assertEqual('g', mem.var_stack[0].vars['myglobal'].val.s)
self.assertEqual(False, mem.var_stack[0].vars['myglobal'].exported)
# 'export PYTHONPATH=/'
mem.SetVar(runtime.LhsName('PYTHONPATH'), runtime.Str('/'),
(var_flags_e.Exported, ), scope_e.Dynamic)
self.assertEqual('/', mem.var_stack[0].vars['PYTHONPATH'].val.s)
self.assertEqual(True, mem.var_stack[0].vars['PYTHONPATH'].exported)
self.assertEqual({'PYTHONPATH': '/'}, mem.GetExported())
mem.SetVar(runtime.LhsName('PYTHONPATH'), None,
(var_flags_e.Exported, ), scope_e.Dynamic)
self.assertEqual(True, mem.var_stack[0].vars['PYTHONPATH'].exported)
# 'export myglobal'. None means don't touch it. Undef would be confusing
# because it might mean "unset", but we have a separated API for that.
mem.SetVar(runtime.LhsName('myglobal'), None, (var_flags_e.Exported, ),
scope_e.Dynamic)
self.assertEqual(True, mem.var_stack[0].vars['myglobal'].exported)
# export g2 -- define and export empty
mem.SetVar(runtime.LhsName('g2'), None, (var_flags_e.Exported, ),
scope_e.Dynamic)
self.assertEqual(value_e.Undef, mem.var_stack[0].vars['g2'].val.tag)
self.assertEqual(True, mem.var_stack[0].vars['g2'].exported)
# readonly myglobal
self.assertEqual(False, mem.var_stack[0].vars['myglobal'].readonly)
mem.SetVar(runtime.LhsName('myglobal'), None, (var_flags_e.ReadOnly, ),
scope_e.Dynamic)
self.assertEqual(True, mem.var_stack[0].vars['myglobal'].readonly)
mem.SetVar(runtime.LhsName('PYTHONPATH'), runtime.Str('/lib'), (),
scope_e.Dynamic)
self.assertEqual('/lib', mem.var_stack[0].vars['PYTHONPATH'].val.s)
self.assertEqual(True, mem.var_stack[0].vars['PYTHONPATH'].exported)
# COMPREPLY=(1 2 3)
# invariant to enforce: arrays can't be exported
mem.SetVar(runtime.LhsName('COMPREPLY'),
runtime.StrArray(['1', '2', '3']), (), scope_e.GlobalOnly)
self.assertEqual(['1', '2', '3'],
mem.var_stack[0].vars['COMPREPLY'].val.strs)
# export COMPREPLY
try:
mem.SetVar(runtime.LhsName('COMPREPLY'), None,
(var_flags_e.Exported, ), scope_e.Dynamic)
except util.FatalRuntimeError as e:
pass
else:
self.fail("Expected failure")
# readonly r=1
mem.SetVar(runtime.LhsName('r'), runtime.Str('1'),
(var_flags_e.ReadOnly, ), scope_e.Dynamic)
self.assertEqual('1', mem.var_stack[0].vars['r'].val.s)
self.assertEqual(False, mem.var_stack[0].vars['r'].exported)
self.assertEqual(True, mem.var_stack[0].vars['r'].readonly)
print(mem)
# r=newvalue
try:
mem.SetVar(runtime.LhsName('r'), runtime.Str('newvalue'), (),
scope_e.Dynamic)
except util.FatalRuntimeError as e:
pass
else:
self.fail("Expected failure")
# readonly r2 -- define empty readonly
mem.SetVar(runtime.LhsName('r2'), None, (var_flags_e.ReadOnly, ),
scope_e.Dynamic)
self.assertEqual(value_e.Undef, mem.var_stack[0].vars['r2'].val.tag)
self.assertEqual(True, mem.var_stack[0].vars['r2'].readonly)
# export -n PYTHONPATH
# Remove the exported property. NOTE: scope is LocalOnly for Oil?
self.assertEqual(True, mem.var_stack[0].vars['PYTHONPATH'].exported)
mem.ClearFlag('PYTHONPATH', var_flags_e.Exported, scope_e.Dynamic)
self.assertEqual(False, mem.var_stack[0].vars['PYTHONPATH'].exported)
# a[1]=2
mem.SetVar(runtime.LhsIndexedName('a', 1), runtime.Str('2'), (),
scope_e.Dynamic)
self.assertEqual([None, '2'], mem.var_stack[0].vars['a'].val.strs)
# a[1]=3
mem.SetVar(runtime.LhsIndexedName('a', 1), runtime.Str('3'), (),
scope_e.Dynamic)
self.assertEqual([None, '3'], mem.var_stack[0].vars['a'].val.strs)
# a[1]=(x y z) # illegal
try:
mem.SetVar(runtime.LhsIndexedName('a', 1),
runtime.StrArray(['x', 'y', 'z']), (), scope_e.Dynamic)
except util.FatalRuntimeError as e:
pass
else:
self.fail("Expected failure")
# readonly a
mem.SetVar(runtime.LhsName('a'), None, (var_flags_e.ReadOnly, ),
scope_e.Dynamic)
self.assertEqual(True, mem.var_stack[0].vars['a'].readonly)
try:
# a[2]=3
mem.SetVar(runtime.LhsIndexedName('a', 1), runtime.Str('3'), (),
scope_e.Dynamic)
except util.FatalRuntimeError as e:
pass
else:
self.fail("Expected failure")
