def testPushTemp(self):
mem = _InitMem()
# x=1
mem.SetVar(
lvalue.Named('x'), value.Str('1'), scope_e.Dynamic)
self.assertEqual('1', mem.var_stack[-1]['x'].val.s)
mem.PushTemp()
self.assertEqual(2, len(mem.var_stack))
# x=temp E=3 read x <<< 'line'
mem.SetVar(
lvalue.Named('x'), value.Str('temp'), scope_e.LocalOnly)
mem.SetVar(
lvalue.Named('E'), value.Str('3'), scope_e.LocalOnly)
mem.SetVar(
lvalue.Named('x'), value.Str('line'), scope_e.LocalOnly)
self.assertEqual('3', mem.var_stack[-1]['E'].val.s)
self.assertEqual('line', mem.var_stack[-1]['x'].val.s)
self.assertEqual('1', mem.var_stack[-2]['x'].val.s)
mem.PopTemp()
self.assertEqual(1, len(mem.var_stack))
self.assertEqual('1', mem.var_stack[-1]['x'].val.s)
def testExportThenAssign(self):
"""Regression Test"""
mem = _InitMem()
# export U
mem.SetVar(lvalue.Named('U'), None, (var_flags_e.Exported, ),
scope_e.Dynamic)
print(mem)
# U=u
mem.SetVar(lvalue.Named('U'), value.Str('u'), (), scope_e.Dynamic)
print(mem)
e = mem.GetExported()
self.assertEqual('u', e['U'])
def Run(self, cmd_val):
# type: (cmd_value__Assign) -> int
arg_r = args.Reader(cmd_val.argv, spids=cmd_val.arg_spids)
arg_r.Next()
attrs = flag_spec.Parse('readonly', arg_r)
arg = arg_types.readonly(attrs.attrs)
if arg.p or len(cmd_val.pairs) == 0:
return _PrintVariables(self.mem, cmd_val, attrs, True, builtin=_READONLY)
for pair in cmd_val.pairs:
if pair.rval is None:
if arg.a:
rval = value.MaybeStrArray([]) # type: value_t
elif arg.A:
rval = value.AssocArray({})
else:
rval = None
else:
rval = pair.rval
rval = _ReconcileTypes(rval, arg.a, arg.A, pair.spid)
# NOTE:
# - when rval is None, only flags are changed
# - dynamic scope because flags on locals can be changed, etc.
self.mem.SetVar(lvalue.Named(pair.var_name), rval, scope_e.Dynamic,
flags=state.SetReadOnly)
return 0
def Run(self, cmd_val):
# type: (cmd_value__Assign) -> int
arg_r = args.Reader(cmd_val.argv, spids=cmd_val.arg_spids)
arg_r.Next()
attrs = flag_spec.Parse('export_', arg_r)
arg = arg_types.export_(attrs.attrs)
#arg = attrs
if arg.f:
e_usage(
"doesn't accept -f because it's dangerous. "
"(The code can usually be restructured with 'source')")
if arg.p or len(cmd_val.pairs) == 0:
return _PrintVariables(self.mem, cmd_val, attrs, True, builtin=_EXPORT)
if arg.n:
for pair in cmd_val.pairs:
if pair.rval is not None:
e_usage("doesn't accept RHS with -n", span_id=pair.spid)
# NOTE: we don't care if it wasn't found, like bash.
self.mem.ClearFlag(pair.var_name, state.ClearExport, scope_e.Dynamic)
else:
for pair in cmd_val.pairs:
# NOTE: when rval is None, only flags are changed
self.mem.SetVar(lvalue.Named(pair.var_name), pair.rval, scope_e.Dynamic,
flags=state.SetExport)
return 0
def _EvalLhsArith(node, mem, arith_ev):
"""sh_lhs_expr -> lvalue.
Very similar to EvalLhs above in core/cmd_exec.
"""
assert isinstance(node, sh_lhs_expr_t), node
if node.tag == sh_lhs_expr_e.Name: # (( i = 42 ))
lval = lvalue.Named(node.name)
# TODO: location info. Use the = token?
#lval.spids.append(spid)
return lval
elif node.tag == sh_lhs_expr_e.IndexedName: # (( a[42] = 42 ))
# The index of MaybeStrArray needs to be coerced to int, but not the index of
# an AssocArray.
if mem.IsAssocArray(node.name, scope_e.Dynamic):
key = arith_ev.EvalWordToString(node.index)
lval = lvalue.Keyed(node.name, key)
else:
index = arith_ev.EvalToIndex(node.index)
lval = lvalue.Indexed(node.name, index)
# TODO: location info. Use the = token?
#lval.spids.append(node.spids[0])
else:
raise AssertionError(node.tag)
return lval
def _EvalLhsArith(node, mem, arith_ev):
# type: (sh_lhs_expr_t, Mem, ArithEvaluator) -> lvalue_t
"""sh_lhs_expr -> lvalue.
Very similar to EvalLhs above in core/cmd_exec.
"""
assert isinstance(node, sh_lhs_expr_t), node
UP_node = node
with tagswitch(node) as case:
if case(sh_lhs_expr_e.Name): # (( i = 42 ))
node = cast(sh_lhs_expr__Name, UP_node)
lval = lvalue.Named(node.name) # type: lvalue_t
# TODO: location info. Use the = token?
#lval.spids.append(spid)
elif case(sh_lhs_expr_e.IndexedName): # (( a[42] = 42 ))
node = cast(sh_lhs_expr__IndexedName, UP_node)
# The index of MaybeStrArray needs to be coerced to int, but not the
# index of an AssocArray.
if mem.IsAssocArray(node.name, scope_e.Dynamic):
key = arith_ev.EvalWordToString(node.index)
lval = lvalue.Keyed(node.name, key)
else:
index = arith_ev.EvalToInt(node.index)
lval = lvalue.Indexed(node.name, index)
# TODO: location info. Use the = token?
#lval.spids.append(node.spids[0])
else:
raise AssertionError(node.tag_())
return lval
def EvalArithLhs(self, anode, span_id):
# type: (arith_expr_t, int) -> lvalue_t
"""
For (( a[x] = 1 )) etc.
"""
UP_anode = anode
if anode.tag_() == arith_expr_e.Binary:
anode = cast(arith_expr__Binary, UP_anode)
if anode.op_id == Id.Arith_LBracket:
var_name, span_id = self._VarRefOrWord(anode.left)
if var_name is not None:
if self.mem.IsAssocArray(var_name, scope_e.Dynamic):
key = self.EvalWordToString(anode.right)
lval2 = lvalue.Keyed(var_name, key)
lval2.spids.append(span_id)
lval = lval2 # type: lvalue_t
return lval
else:
index = self.EvalToInt(anode.right)
lval3 = lvalue.Indexed(var_name, index)
lval3.spids.append(span_id)
lval = lval3
return lval
var_name, span_id = self._VarRefOrWord(anode)
if var_name is not None:
lval1 = lvalue.Named(var_name)
lval1.spids.append(span_id)
lval = lval1
return lval
# e.g. unset 'x-y'. status 2 for runtime parse error
e_die('Invalid place to modify', span_id=span_id, status=2)
def EvalLhs(node, arith_ev, mem, spid, lookup_mode):
"""sh_lhs_expr -> lvalue.
Used for a=b and a[x]=b
"""
assert isinstance(node, sh_lhs_expr_t), node
if node.tag == sh_lhs_expr_e.Name: # a=x
lval = lvalue.Named(node.name)
lval.spids.append(spid)
elif node.tag == sh_lhs_expr_e.IndexedName: # a[1+2]=x
if mem.IsAssocArray(node.name, lookup_mode):
key = arith_ev.EvalWordToString(node.index)
lval = lvalue.Keyed(node.name, key)
lval.spids.append(node.spids[0]) # copy left-most token over
else:
index = arith_ev.EvalToIndex(node.index)
lval = lvalue.Indexed(node.name, index)
lval.spids.append(node.spids[0]) # copy left-most token over
else:
raise AssertionError(node.tag)
return lval
def _EvalTempEnv(self, more_env, flags):
"""For FOO=1 cmd."""
for env_pair in more_env:
val = self.word_ev.EvalWordToString(env_pair.val)
# Set each var so the next one can reference it. Example:
# FOO=1 BAR=$FOO ls /
self.mem.SetVar(lvalue.Named(env_pair.name), val, flags,
scope_e.LocalOnly)
def testUnset(self):
mem = _InitMem()
# unset a
mem.Unset(lvalue.Named('a'), scope_e.Dynamic)
return # not implemented yet
# unset a[1]
mem.Unset(lvalue.Indexed('a', 1), scope_e.Dynamic)
def _All(self, var_name):
# type: (str) -> int
contents = _ReadAll()
# No error conditions?
lhs = lvalue.Named(var_name)
self.mem.SetValue(lhs, value.Str(contents), scope_e.LocalOnly)
return 0
def _UnsetVar(self, name, spid):
if not match.IsValidVarName(name):
raise args.UsageError(
'got invalid variable name %r' % name, span_id=spid)
ok, found = self.mem.Unset(lvalue.Named(name), scope_e.Dynamic)
if not ok:
self.errfmt.Print("Can't unset readonly variable %r", name,
span_id=spid)
return ok, found
def testGetVar(self):
mem = _InitMem()
# readonly a=x
mem.SetVar(lvalue.Named('a'), value.Str('x'), (var_flags_e.ReadOnly, ),
scope_e.Dynamic)
val = mem.GetVar('a', scope_e.Dynamic)
test_lib.AssertAsdlEqual(self, value.Str('x'), val)
val = mem.GetVar('undef', scope_e.Dynamic)
test_lib.AssertAsdlEqual(self, value.Undef(), val)
def EvalLHS(self, node):
if 0:
print('EvalLHS()')
node.PrettyPrint()
print('')
if node.tag == expr_e.Var:
return lvalue.Named(node.name.val)
else:
# TODO:
# subscripts, tuple unpacking, starred expressions, etc.
raise NotImplementedError(node.__class__.__name__)
def __init__(
self,
parse_ctx, # type: ParseContext
exec_opts, # type: optview.Exec
mutable_opts, # type: MutableOpts
mem, # type: Mem
f, # type: _DebugFile
):
# type: (...) -> None
"""
Args:
parse_ctx: For parsing PS4.
exec_opts: For xtrace setting
mem: for retrieving PS4
word_ev: for evaluating PS4
"""
self.parse_ctx = parse_ctx
self.exec_opts = exec_opts
self.mutable_opts = mutable_opts
self.mem = mem
self.f = f # can be stderr, the --debug-file, etc.
self.word_ev = None # type: NormalWordEvaluator
self.ind = 0 # changed by process, proc, source, eval
self.indents = [''] # "pooled" to avoid allocations
# PS4 value -> compound_word. PS4 is scoped.
self.parse_cache = {} # type: Dict[str, compound_word]
# Mutate objects to save allocations
self.val_indent = value.Str('')
self.val_punct = value.Str('')
self.val_pid_str = value.Str('') # mutated by SetProcess
# Can these be global constants? I don't think we have that in ASDL yet.
self.lval_indent = lvalue.Named('SHX_indent')
self.lval_punct = lvalue.Named('SHX_punct')
self.lval_pid_str = lvalue.Named('SHX_pid_str')
def testGetValue(self):
mem = _InitMem()
# readonly a=x
mem.SetValue(lvalue.Named('a'),
value.Str('x'),
scope_e.Dynamic,
flags=state.SetReadOnly)
val = mem.GetValue('a', scope_e.Dynamic)
test_lib.AssertAsdlEqual(self, value.Str('x'), val)
val = mem.GetValue('undef', scope_e.Dynamic)
test_lib.AssertAsdlEqual(self, value.Undef(), val)
def _Line(self, arg, var_name):
# type: (arg_types.read, str) -> int
line = _ReadLine()
if len(line) == 0: # EOF
return 1
if not arg.with_eol:
if line.endswith('\r\n'):
line = line[:-2]
elif line.endswith('\n'):
line = line[:-1]
lhs = lvalue.Named(var_name)
self.mem.SetVar(lhs, value.Str(line), scope_e.LocalOnly)
return 0
def _gen():
while True:
try:
loop_val = it.next() # e.g. x
except StopIteration:
break
self.mem.SetVar(lvalue.Named(iter_name),
value.Obj(loop_val), scope_e.LocalOnly)
if comp.cond:
b = self.EvalExpr(comp.cond)
else:
b = True
if b:
item = self.EvalExpr(node.elt) # e.g. x*2
yield item
def EvalPlaceExpr(self, place):
# type: (place_expr_t) -> Union[lvalue__Named, lvalue__ObjIndex, lvalue__ObjAttr]
if place.tag == place_expr_e.Var:
return lvalue.Named(place.name.val)
if place.tag == place_expr_e.Subscript:
obj = self.EvalExpr(place.obj)
index = self._EvalIndices(place.indices)
return lvalue.ObjIndex(obj, index)
if place.tag == place_expr_e.Attribute:
obj = self.EvalExpr(place.obj)
if place.op.id == Id.Expr_RArrow:
index = place.attr.val
return lvalue.ObjIndex(obj, index)
else:
return lvalue.ObjAttr(obj, place.attr.val)
raise NotImplementedError(place)
def testSearchPath(self):
mem = _InitMem()
#print(mem)
search_path = state.SearchPath(mem)
# Relative path works without $PATH
self.assertEqual(None, search_path.Lookup('__nonexistent__'))
self.assertEqual('bin/osh', search_path.Lookup('bin/osh'))
self.assertEqual(None, search_path.Lookup('grep'))
# Set $PATH
mem.SetVar(lvalue.Named('PATH'), value.Str('/bin:/usr/bin'),
(), scope_e.GlobalOnly)
self.assertEqual(None, search_path.Lookup('__nonexistent__'))
self.assertEqual('bin/osh', search_path.Lookup('bin/osh'))
# Not hermetic, but should be true on POSIX systems.
self.assertEqual('/usr/bin/env', search_path.Lookup('env'))
def _Line(self, arg, var_name):
# type: (arg_types.read, str) -> int
line = _ReadLine()
if len(line) == 0: # EOF
return 1
if not arg.with_eol:
if line.endswith('\r\n'):
line = line[:-2]
elif line.endswith('\n'):
line = line[:-1]
# Lines that don't start with a single quote aren't QSN. They may contain
# a single quote internally, like:
#
# Fool's Gold
if arg.q and line.startswith("'"):
arena = self.parse_ctx.arena
line_reader = reader.StringLineReader(line, arena)
lexer = self.parse_ctx._MakeLexer(line_reader)
# The parser only yields valid tokens:
# Char_Literals, Char_OneChar, Char_Hex, Char_UBraced
# So we can use word_compile.EvalCStringToken, which is also used for
# $''.
# Important: we don't generate Id.Unknown_Backslash because that is valid
# in echo -e. We just make it Id.Unknown_Tok?
try:
# TODO: read should know about stdin, and redirects, and pipelines?
with alloc.ctx_Location(arena, source.Stdin('')):
tokens = qsn_native.Parse(lexer)
except error.Parse as e:
ui.PrettyPrintError(e, arena)
return 1
tmp = [word_compile.EvalCStringToken(t) for t in tokens]
line = ''.join(tmp)
lhs = lvalue.Named(var_name)
self.mem.SetValue(lhs, value.Str(line), scope_e.LocalOnly)
return 0
def EvalLhs(node, arith_ev, mem, spid, lookup_mode):
# type: (sh_lhs_expr_t, ArithEvaluator, Mem, int, scope_t) -> lvalue_t
"""sh_lhs_expr -> lvalue.
Used for a=b and a[x]=b
"""
assert isinstance(node, sh_lhs_expr_t), node
UP_node = node
lval = None # type: lvalue_t
with tagswitch(node) as case:
if case(sh_lhs_expr_e.Name): # a=x
node = cast(sh_lhs_expr__Name, UP_node)
# Note: C++ constructor doesn't take spids directly. Should we add that?
lval1 = lvalue.Named(node.name)
lval1.spids.append(spid)
lval = lval1
elif case(sh_lhs_expr_e.IndexedName): # a[1+2]=x
node = cast(sh_lhs_expr__IndexedName, UP_node)
if mem.IsAssocArray(node.name, lookup_mode):
key = arith_ev.EvalWordToString(node.index)
# copy left-mode spid
lval2 = lvalue.Keyed(node.name, key)
lval2.spids.append(node.spids[0])
lval = lval2
else:
index = arith_ev.EvalToInt(node.index)
# copy left-mode spid
lval3 = lvalue.Indexed(node.name, index)
lval3.spids.append(node.spids[0])
lval = lval3
else:
raise AssertionError(node.tag_())
return lval
def EvalShellLhs(self, node, spid, lookup_mode):
# type: (sh_lhs_expr_t, int, scope_t) -> lvalue_t
"""Evaluate a shell LHS expression, i.e. place expression.
For a=b and a[x]=b etc.
"""
assert isinstance(node, sh_lhs_expr_t), node
UP_node = node
lval = None # type: lvalue_t
with tagswitch(node) as case:
if case(sh_lhs_expr_e.Name): # a=x
node = cast(sh_lhs_expr__Name, UP_node)
# Note: C++ constructor doesn't take spids directly. Should we add that?
lval1 = lvalue.Named(node.name)
lval1.spids.append(spid)
lval = lval1
elif case(sh_lhs_expr_e.IndexedName): # a[1+2]=x
node = cast(sh_lhs_expr__IndexedName, UP_node)
if self.mem.IsAssocArray(node.name, lookup_mode):
key = self.EvalWordToString(node.index)
lval2 = lvalue.Keyed(node.name, key)
lval2.spids.append(node.spids[0])
lval = lval2
else:
index = self.EvalToInt(node.index)
lval3 = lvalue.Indexed(node.name, index)
lval3.spids.append(node.spids[0])
lval = lval3
else:
raise AssertionError(node.tag_())
return lval
def testSearchPath(self):
mem = _InitMem()
#print(mem)
search_path = state.SearchPath(mem)
# Relative path works without $PATH
self.assertEqual(None, search_path.Lookup('__nonexistent__'))
self.assertEqual('bin/osh', search_path.Lookup('bin/osh'))
self.assertEqual(None, search_path.Lookup('grep'))
# Set $PATH
mem.SetVar(lvalue.Named('PATH'), value.Str('/bin:/usr/bin'), (),
scope_e.GlobalOnly)
self.assertEqual(None, search_path.Lookup('__nonexistent__'))
self.assertEqual('bin/osh', search_path.Lookup('bin/osh'))
# Not hermetic, but should be true on POSIX systems.
# Also see https://www.freedesktop.org/wiki/Software/systemd/TheCaseForTheUsrMerge/
# - on some systems, /bin is a symlink to /usr/bin
if os.path.isfile('/bin/env'):
self.assertEqual(search_path.Lookup('env'), '/bin/env')
else:
self.assertEqual(search_path.Lookup('env'), '/usr/bin/env')
def _WriteFdToMem(self, fd_name, fd):
# type: (str, int) -> None
if self.mem:
# setvar, not setref
state.SetLocalShopt(self.mem, lvalue.Named(fd_name),
value.Str(str(fd)))
def EvalExpr(self, node):
# type: (expr_t) -> Any
"""
This is a naive PyObject evaluator! It uses the type dispatch of the host
Python interpreter.
Returns:
A Python object of ANY type. Should be wrapped in value.Obj() for
storing in Mem.
"""
if 0:
print('EvalExpr()')
node.PrettyPrint()
print('')
if node.tag == expr_e.Const:
id_ = node.c.id
if id_ == Id.Expr_DecInt:
return int(node.c.val)
elif id_ == Id.Expr_BinInt:
return int(node.c.val, 2)
elif id_ == Id.Expr_OctInt:
return int(node.c.val, 8)
elif id_ == Id.Expr_HexInt:
return int(node.c.val, 16)
elif id_ == Id.Expr_Float:
return float(node.c.val)
elif id_ == Id.Expr_Null:
return None
elif id_ == Id.Expr_True:
return True
elif id_ == Id.Expr_False:
return False
elif id_ == Id.Expr_Name:
# for {name: 'bob'}
# Maybe also :Symbol?
return node.c.val
# NOTE: We could allow Ellipsis for a[:, ...] here, but we're not using
# it yet.
raise AssertionError(id_)
if node.tag == expr_e.Var:
return self.LookupVar(node.name.val)
if node.tag == expr_e.CommandSub:
return self.ex.RunCommandSub(node.command_list)
if node.tag == expr_e.ShArrayLiteral:
words = braces.BraceExpandWords(node.words)
strs = self.word_ev.EvalWordSequence(words)
#log('ARRAY LITERAL EVALUATED TO -> %s', strs)
return objects.StrArray(strs)
if node.tag == expr_e.DoubleQuoted:
# In an ideal world, I would *statically* disallow:
# - "$@" and "${array[@]}"
# - backticks like `echo hi`
# - $(( 1+2 )) and $[] -- although useful for refactoring
# - not sure: ${x%%} -- could disallow this
# - these enters the ArgDQ state: "${a:-foo bar}" ?
# But that would complicate the parser/evaluator. So just rely on
# strict_array to disallow the bad parts.
return self.word_ev.EvalDoubleQuotedToString(node)
if node.tag == expr_e.SingleQuoted:
return word_eval.EvalSingleQuoted(node)
if node.tag == expr_e.BracedVarSub:
return self.word_ev.EvalBracedVarSubToString(node)
if node.tag == expr_e.SimpleVarSub:
return self.word_ev.EvalSimpleVarSubToString(node.token)
if node.tag == expr_e.Unary:
child = self.EvalExpr(node.child)
if node.op.id == Id.Arith_Minus:
return -child
if node.op.id == Id.Arith_Tilde:
return ~child
if node.op.id == Id.Expr_Not:
return not child
raise NotImplementedError(node.op.id)
if node.tag == expr_e.Binary:
left = self.EvalExpr(node.left)
right = self.EvalExpr(node.right)
if node.op.id == Id.Arith_Plus:
return left + right
if node.op.id == Id.Arith_Minus:
return left - right
if node.op.id == Id.Arith_Star:
return left * right
if node.op.id == Id.Arith_Slash:
# NOTE: from __future__ import division changes 5/2!
# But just make it explicit.
return float(left) / right # floating point division
if node.op.id == Id.Expr_Div:
return left // right # integer divison
if node.op.id == Id.Expr_Mod:
return left % right
if node.op.id == Id.Arith_Caret: # Exponentiation
return left**right
# Bitwise
if node.op.id == Id.Arith_Amp:
return left & right
if node.op.id == Id.Arith_Pipe:
return left | right
if node.op.id == Id.Expr_Xor:
return left ^ right
if node.op.id == Id.Arith_DGreat:
return left >> right
if node.op.id == Id.Arith_DLess:
return left << right
# Logical
if node.op.id == Id.Expr_And:
return left and right
if node.op.id == Id.Expr_Or:
return left or right
raise NotImplementedError(node.op.id)
if node.tag == expr_e.Range: # 1:10 or 1:10:2
lower = self.EvalExpr(node.lower)
upper = self.EvalExpr(node.upper)
return xrange(lower, upper)
if node.tag == expr_e.Slice: # a[:0]
lower = self.EvalExpr(node.lower) if node.lower else None
upper = self.EvalExpr(node.upper) if node.upper else None
return slice(lower, upper)
if node.tag == expr_e.Compare:
left = self.EvalExpr(node.left)
result = True # Implicit and
for op, right_expr in zip(node.ops, node.comparators):
right = self.EvalExpr(right_expr)
if op.id == Id.Arith_Less:
result = left < right
elif op.id == Id.Arith_Great:
result = left > right
elif op.id == Id.Arith_GreatEqual:
result = left >= right
elif op.id == Id.Arith_LessEqual:
result = left <= right
elif op.id == Id.Arith_DEqual:
result = left == right
elif op.id == Id.Expr_In:
result = left in right
elif op.id == Id.Node_NotIn:
result = left not in right
elif op.id == Id.Expr_Is:
result = left is right
elif op.id == Id.Node_IsNot:
result = left is not right
else:
try:
if op.id == Id.Arith_Tilde:
result = self._EvalMatch(left, right, True)
elif op.id == Id.Expr_NotTilde:
result = not self._EvalMatch(left, right, False)
else:
raise AssertionError(op.id)
except RuntimeError as e:
# Status 2 indicates a regex parse error. This is fatal in OSH but
# not in bash, which treats [[ like a command with an exit code.
e_die("Invalid regex %r",
right,
span_id=op.span_id,
status=2)
if not result:
return result
left = right
return result
if node.tag == expr_e.IfExp:
b = self.EvalExpr(node.test)
if b:
return self.EvalExpr(node.body)
else:
return self.EvalExpr(node.orelse)
if node.tag == expr_e.List:
return [self.EvalExpr(e) for e in node.elts]
if node.tag == expr_e.Tuple:
return tuple(self.EvalExpr(e) for e in node.elts)
if node.tag == expr_e.Dict:
# NOTE: some keys are expr.Const
keys = [self.EvalExpr(e) for e in node.keys]
values = []
for i, e in enumerate(node.values):
if e.tag == expr_e.Implicit:
v = self.LookupVar(keys[i]) # {name}
else:
v = self.EvalExpr(e)
values.append(v)
return dict(zip(keys, values))
if node.tag == expr_e.ListComp:
# TODO:
# - Consolidate with command_e.OilForIn in osh/cmd_exec.py?
# - Do I have to push a temp frame here?
# Hm... lexical or dynamic scope is an issue.
result = []
comp = node.generators[0]
obj = self.EvalExpr(comp.iter)
# TODO: Handle x,y etc.
iter_name = comp.lhs[0].name.val
if isinstance(obj, str):
e_die("Strings aren't iterable")
else:
it = obj.__iter__()
while True:
try:
loop_val = it.next() # e.g. x
except StopIteration:
break
self.mem.SetVar(lvalue.Named(iter_name), value.Obj(loop_val),
scope_e.LocalOnly)
if comp.cond:
b = self.EvalExpr(comp.cond)
else:
b = True
if b:
item = self.EvalExpr(node.elt) # e.g. x*2
result.append(item)
return result
if node.tag == expr_e.GeneratorExp:
comp = node.generators[0]
obj = self.EvalExpr(comp.iter)
# TODO: Support (x for x, y in ...)
iter_name = comp.lhs[0].name.val
it = obj.__iter__()
# TODO: There is probably a much better way to do this!
# The scope of the loop variable is wrong, etc.
def _gen():
while True:
try:
loop_val = it.next() # e.g. x
except StopIteration:
break
self.mem.SetVar(lvalue.Named(iter_name),
value.Obj(loop_val), scope_e.LocalOnly)
if comp.cond:
b = self.EvalExpr(comp.cond)
else:
b = True
if b:
item = self.EvalExpr(node.elt) # e.g. x*2
yield item
return _gen()
if node.tag == expr_e.Lambda:
return objects.Lambda(node, self.ex)
if node.tag == expr_e.FuncCall:
func = self.EvalExpr(node.func)
pos_args, named_args = self.EvalArgList(node.args)
ret = func(*pos_args, **named_args)
return ret
if node.tag == expr_e.Subscript:
obj = self.EvalExpr(node.obj)
index = self._EvalIndices(node.indices)
return obj[index]
# TODO: obj.method() should be separate
if node.tag == expr_e.Attribute: # obj.attr
o = self.EvalExpr(node.obj)
id_ = node.op.id
if id_ == Id.Expr_Dot:
name = node.attr.val
# TODO: Does this do the bound method thing we do NOT want?
return getattr(o, name)
if id_ == Id.Expr_RArrow: # d->key is like d['key']
name = node.attr.val
return o[name]
if id_ == Id.Expr_DColon: # StaticName::member
raise NotImplementedError(id_)
# TODO: We should prevent virtual lookup here? This is a pure static
# namespace lookup?
# But Python doesn't any hook for this.
# Maybe we can just check that it's a module? And modules don't lookup
# in a supertype or __class__, etc.
raise AssertionError(id_)
if node.tag == expr_e.RegexLiteral: # obj.attr
# TODO: Should this just be an object that ~ calls?
return objects.Regex(self.EvalRegex(node.regex))
if node.tag == expr_e.ArrayLiteral: # obj.attr
items = [self.EvalExpr(item) for item in node.items]
if items:
# Determine type at runtime? If we have something like @[(i) (j)]
# then we don't know its type until runtime.
first = items[0]
if isinstance(first, bool):
return objects.BoolArray(bool(x) for x in items)
elif isinstance(first, int):
return objects.IntArray(int(x) for x in items)
elif isinstance(first, float):
return objects.FloatArray(float(x) for x in items)
elif isinstance(first, str):
return objects.StrArray(str(x) for x in items)
else:
raise AssertionError(first)
else:
# TODO: Should this have an unknown type?
# What happens when you mutate or extend it? You have to make sure
# that the type tags match?
return objects.BoolArray(items)
raise NotImplementedError(node.__class__.__name__)
def _WriteFdToMem(self, fd_name, fd):
# type: (str, int) -> None
if self.mem:
self.mem.SetVar(lvalue.Named(fd_name), value.Str(str(fd)),
scope_e.Dynamic)
def Run(self, cmd_val):
# type: (cmd_value__Assign) -> int
arg_r = args.Reader(cmd_val.argv, spids=cmd_val.arg_spids)
arg_r.Next()
attrs = flag_spec.Parse('new_var', arg_r)
arg = arg_types.new_var(attrs.attrs)
status = 0
if arg.f:
names = arg_r.Rest()
if len(names):
# NOTE: in bash, -f shows the function body, while -F shows the name.
# Right now we just show the name.
status = self._PrintFuncs(names)
else:
e_usage('passed -f without args')
return status
if arg.F:
names = arg_r.Rest()
if len(names):
status = self._PrintFuncs(names)
else: # weird bash quirk: they're printed in a different format!
for func_name in sorted(self.funcs):
print('declare -f %s' % (func_name))
return status
if arg.p: # Lookup and print variables.
return _PrintVariables(self.mem, cmd_val, attrs, True)
elif len(cmd_val.pairs) == 0:
return _PrintVariables(self.mem, cmd_val, attrs, False)
#
# Set variables
#
#raise error.Usage("doesn't understand %s" % cmd_val.argv[1:])
if cmd_val.builtin_id == builtin_i.local:
lookup_mode = scope_e.LocalOnly
else: # declare/typeset
if arg.g:
lookup_mode = scope_e.GlobalOnly
else:
lookup_mode = scope_e.LocalOnly
flags = 0
if arg.x == '-':
flags |= state.SetExport
if arg.r == '-':
flags |= state.SetReadOnly
if arg.n == '-':
flags |= state.SetNameref
flags_to_clear = 0
if arg.x == '+':
flags |= state.ClearExport
if arg.r == '+':
flags |= state.ClearReadOnly
if arg.n == '+':
flags |= state.ClearNameref
for pair in cmd_val.pairs:
rval = pair.rval
# declare -a foo=(a b); declare -a foo; should not reset to empty array
if rval is None and (arg.a or arg.A):
old_val = self.mem.GetVar(pair.var_name)
if arg.a:
if old_val.tag_() != value_e.MaybeStrArray:
rval = value.MaybeStrArray([])
elif arg.A:
if old_val.tag_() != value_e.AssocArray:
rval = value.AssocArray({})
rval = _ReconcileTypes(rval, arg.a, arg.A, pair.spid)
self.mem.SetVar(lvalue.Named(pair.var_name),
rval,
lookup_mode,
flags=flags)
return status
def SetLocalString(mem, name, s): # type: (state.Mem, str, str) -> None """Bind a local string.""" assert isinstance(s, str) mem.SetValue(lvalue.Named(name), value.Str(s), scope_e.LocalOnly)
def EvalLhsAndLookup(node,
arith_ev,
mem,
exec_opts,
lookup_mode=scope_e.Dynamic):
# type: (sh_lhs_expr_t, ArithEvaluator, Mem, optview.Exec, scope_t) -> Tuple[value_t, lvalue_t]
"""Evaluate the operand for i++, a[0]++, i+=2, a[0]+=2 as an R-value.
Also used by the Executor for s+='x' and a[42]+='x'.
Args:
node: syntax_asdl.sh_lhs_expr
Returns:
value_t, lvalue_t
"""
#log('sh_lhs_expr NODE %s', node)
assert isinstance(node, sh_lhs_expr_t), node
UP_node = node
with tagswitch(node) as case:
if case(sh_lhs_expr_e.Name): # a = b
node = cast(sh_lhs_expr__Name, UP_node)
# Problem: It can't be an array?
# a=(1 2)
# (( a++ ))
lval = lvalue.Named(node.name) # type: lvalue_t
val = _LookupVar(node.name, mem, exec_opts)
elif case(sh_lhs_expr_e.IndexedName): # a[1] = b
node = cast(sh_lhs_expr__IndexedName, UP_node)
# See tdop.IsIndexable for valid values:
# - VarRef (not Name): a[1]
# - FuncCall: f(x), 1
# - Binary LBracket: f[1][1] -- no semantics for this?
val = mem.GetVar(node.name)
UP_val = val
with tagswitch(val) as case2:
if case2(value_e.Str):
e_die("Can't assign to characters of string %r", node.name)
elif case2(value_e.Undef):
# compatible behavior: Treat it like an array.
# TODO: Does this code ever get triggered? It seems like the error is
# caught earlier.
index = arith_ev.EvalToInt(node.index)
lval = lvalue.Indexed(node.name, index)
if exec_opts.nounset():
e_die("Undefined variable can't be indexed")
else:
val = value.Str('')
elif case2(value_e.MaybeStrArray):
array_val = cast(value__MaybeStrArray, UP_val)
#log('ARRAY %s -> %s, index %d', node.name, array, index)
index = arith_ev.EvalToInt(node.index)
lval = lvalue.Indexed(node.name, index)
# NOTE: Similar logic in RHS Arith_LBracket
try:
s = array_val.strs[index]
except IndexError:
s = None
if s is None:
val = value.Str(
'') # NOTE: Other logic is value.Undef()? 0?
else:
assert isinstance(s, str), s
val = value.Str(s)
elif case2(value_e.AssocArray): # declare -A a; a['x']+=1
assoc_val = cast(value__AssocArray, UP_val)
key = arith_ev.EvalWordToString(node.index)
lval = lvalue.Keyed(node.name, key)
s = assoc_val.d.get(key)
if s is None:
val = value.Str('')
else:
val = value.Str(s)
else:
raise AssertionError(val.tag_())
else:
raise AssertionError(node.tag_())
return val, lval
