def EvalWordSequence2(self, words):
"""Turns a list of Words into a list of strings.
Unlike the EvalWord*() methods, it does globbing.
Args:
words: list of Word instances
Returns:
argv: list of string arguments, or None if there was an eval error
"""
# Parse time:
# 1. brace expansion. TODO: Do at parse time.
# 2. Tilde detection. DONE at parse time. Only if Id.Lit_Tilde is the
# first WordPart.
#
# Run time:
# 3. tilde sub, var sub, command sub, arith sub. These are all
# "concurrent" on WordParts. (optional process sub with <() )
# 4. word splitting. Can turn this off with a shell option? Definitely
# off for oil.
# 5. globbing -- several exec_opts affect this: nullglob, safeglob, etc.
#log('W %s', words)
arg_vec = arg_vector()
strs = arg_vec.strs
n = 0
for w in words:
part_vals = []
self._EvalWordToParts(w, False, part_vals) # not double quoted
if 0:
log('')
log('part_vals after _EvalWordToParts:')
for entry in part_vals:
log(' %s', entry)
frames = _MakeWordFrames(part_vals)
if 0:
log('')
log('frames after _MakeWordFrames:')
for entry in frames:
log(' %s', entry)
# Now each frame will append zero or more args.
for frame in frames:
self._EvalWordFrame(frame, strs)
# Fill in spids parallel to strs.
n_next = len(strs)
spid = word.LeftMostSpanForWord(w)
for _ in xrange(n_next - n):
arg_vec.spids.append(spid)
n = n_next
#log('ARGV %s', argv)
return arg_vec
def testStringWordEmitter(self):
# Test
argv = '-z X -o -z Y -a -z X'.split()
arg_vec = arg_vector(argv, [0] * len(argv))
e = builtin_bracket._StringWordEmitter(arg_vec)
while True:
w = e.ReadWord(None)
print(w)
if w.id == Id.Eof_Real:
break
def _RunSimpleCommand(self, cmd_val, fork_external):
"""Private interface to run a simple command (including assignment)."""
if cmd_val.tag == cmd_value_e.Argv:
arg_vec = arg_vector(cmd_val.argv, cmd_val.arg_spids)
return self.RunSimpleCommand(arg_vec, fork_external)
elif cmd_val.tag == cmd_value_e.Assign:
return self._RunAssignBuiltin(cmd_val)
else:
raise AssertionError
def _ExtProc(argv):
arg_vec = arg_vector(argv, [0] * len(argv))
argv0_path = None
for path_entry in ['/bin', '/usr/bin']:
full_path = os.path.join(path_entry, argv[0])
if os.path.exists(full_path):
argv0_path = full_path
break
if not argv0_path:
argv0_path = argv[0] # fallback that tests failure case
return Process(ExternalThunk(_EXT_PROG, argv0_path, arg_vec, {}),
_JOB_STATE)
def _Exec(self, arg_vec):
# Apply redirects in this shell. # NOTE: Redirects were processed earlier.
if len(arg_vec.strs) == 1:
return 0
environ = self.mem.GetExported()
cmd = arg_vec.strs[1]
argv0_path = self.search_path.CachedLookup(cmd)
if argv0_path is None:
self.errfmt.Print('exec: %r not found', cmd,
span_id=arg_vec.spids[1])
sys.exit(127) # exec never returns
# shift off 'exec'
arg_vec2 = arg_vector(arg_vec.strs[1:], arg_vec.spids[1:])
self.ext_prog.Exec(argv0_path, arg_vec2, environ) # NEVER RETURNS
def __call__(self, arg_vec, fork_external):
arg, arg_index = COMMAND_SPEC.ParseVec(arg_vec)
if arg.v:
status = 0
names = arg_vec.strs[arg_index:]
for kind, arg in _ResolveNames(names, self.funcs, self.aliases,
self.search_path):
if kind is None:
status = 1 # nothing printed, but we fail
else:
# This is for -v, -V is more detailed.
print(arg)
return status
arg_vec2 = arg_vector(arg_vec.strs[1:], arg_vec.spids[1:]) # shift by one
# 'command ls' suppresses function lookup.
return self.ex.RunSimpleCommand(arg_vec2, fork_external, funcs=False)
def _ExtProc(argv):
arg_vec = arg_vector(argv, [0] * len(argv))
return Process(ExternalThunk(_EXT_PROG, arg_vec, {}))
def _MakeArgVector(argv): argv = [''] + argv # add dummy since arg_vec includes argv[0] # no location info return arg_vector(argv, [runtime.NO_SPID] * len(argv))
def _MakeArgVector(argv):
argv = [''] + argv # add dummy since arg_vec includes argv[0]
# no location info
return arg_vector(argv, [const.NO_INTEGER] * len(argv))
def _RunBuiltinAndRaise(self, builtin_id, arg_vec, fork_external):
"""
Raises:
args.UsageError
"""
# Shift one arg. Builtins don't need to know their own name.
argv = arg_vec.strs[1:]
# Most builtins dispatch with a dictionary
builtin_func = self.builtins.get(builtin_id)
if builtin_func is not None:
status = builtin_func(arg_vec)
# Some builtins "belong" to the executor.
elif builtin_id == builtin_e.EXEC:
status = self._Exec(arg_vec) # may never return
# But if it returns, then we want to permanently apply the redirects
# associated with it.
self.fd_state.MakePermanent()
elif builtin_id == builtin_e.EVAL:
status = self._Eval(arg_vec)
elif builtin_id in (builtin_e.SOURCE, builtin_e.DOT):
status = self._Source(arg_vec)
elif builtin_id == builtin_e.COMMAND:
# TODO: How do we handle fork_external? It doesn't fit the common
# signature. We also don't handle 'command local', etc.
b = builtin.Command(self, self.funcs, self.aliases, self.search_path)
status = b(arg_vec, fork_external)
elif builtin_id == builtin_e.BUILTIN: # NOTE: uses early return style
if not argv:
return 0 # this could be an error in strict mode?
name = arg_vec.strs[1]
# Run regular builtin or special builtin
to_run = builtin.Resolve(name)
if to_run == builtin_e.NONE:
to_run = builtin.ResolveSpecial(name)
if to_run == builtin_e.NONE:
span_id = arg_vec.spids[1]
if builtin.ResolveAssign(name) != builtin_e.NONE:
# NOTE: There's a similar restriction for 'command'
self.errfmt.Print("Can't run assignment builtin recursively",
span_id=span_id)
else:
self.errfmt.Print("%r isn't a shell builtin", span_id=span_id)
return 1
arg_vec2 = arg_vector(arg_vec.strs[1:], arg_vec.spids[1:])
status = self._RunBuiltinAndRaise(to_run, arg_vec2, fork_external)
else:
raise AssertionError('Unhandled builtin: %s' % builtin_id)
assert isinstance(status, int)
return status
