| 1 | # Copyright 2016 Andy Chu. All rights reserved.
|
| 2 | # Licensed under the Apache License, Version 2.0 (the "License");
|
| 3 | # you may not use this file except in compliance with the License.
|
| 4 | # You may obtain a copy of the License at
|
| 5 | #
|
| 6 | # http://www.apache.org/licenses/LICENSE-2.0
|
| 7 | """
|
| 8 | state.py - Interpreter state
|
| 9 | """
|
| 10 | from __future__ import print_function
|
| 11 | import time as time_ # avoid name conflict
|
| 12 |
|
| 13 | from _devbuild.gen.id_kind_asdl import Id
|
| 14 | from _devbuild.gen.option_asdl import option_i
|
| 15 | from _devbuild.gen.runtime_asdl import (scope_e, scope_t, Cell)
|
| 16 | from _devbuild.gen.syntax_asdl import (loc, loc_t, Token, debug_frame,
|
| 17 | debug_frame_e, debug_frame_t)
|
| 18 | from _devbuild.gen.types_asdl import opt_group_i
|
| 19 | from _devbuild.gen.value_asdl import (value, value_e, value_t, Obj, sh_lvalue,
|
| 20 | sh_lvalue_e, sh_lvalue_t, LeftName,
|
| 21 | y_lvalue_e, regex_match, regex_match_e,
|
| 22 | regex_match_t, RegexMatch)
|
| 23 | from core import error
|
| 24 | from core.error import e_usage, e_die
|
| 25 | from core import num
|
| 26 | from core import optview
|
| 27 | from display import ui
|
| 28 | from core import util
|
| 29 | from frontend import consts
|
| 30 | from frontend import location
|
| 31 | from frontend import match
|
| 32 | from mycpp import mops
|
| 33 | from mycpp import mylib
|
| 34 | from mycpp.mylib import (log, print_stderr, str_switch, tagswitch, iteritems,
|
| 35 | NewDict)
|
| 36 | from pylib import os_path
|
| 37 |
|
| 38 | import posix_ as posix
|
| 39 |
|
| 40 | from typing import Tuple, List, Dict, Optional, Any, cast, TYPE_CHECKING
|
| 41 |
|
| 42 | if TYPE_CHECKING:
|
| 43 | from _devbuild.gen.option_asdl import option_t
|
| 44 | from core import alloc
|
| 45 | from osh import sh_expr_eval
|
| 46 |
|
| 47 | _ = log
|
| 48 |
|
| 49 | # flags for mem.SetValue()
|
| 50 | SetReadOnly = 1 << 0
|
| 51 | ClearReadOnly = 1 << 1
|
| 52 | SetExport = 1 << 2
|
| 53 | ClearExport = 1 << 3
|
| 54 | SetNameref = 1 << 4
|
| 55 | ClearNameref = 1 << 5
|
| 56 |
|
| 57 |
|
| 58 | class ctx_Source(object):
|
| 59 | """For source builtin."""
|
| 60 |
|
| 61 | def __init__(self, mem, source_name, argv):
|
| 62 | # type: (Mem, str, List[str]) -> None
|
| 63 | mem.PushSource(source_name, argv)
|
| 64 | self.mem = mem
|
| 65 | self.argv = argv
|
| 66 |
|
| 67 | # Whenever we're sourcing, the 'is-main' builtin will return 1 (false)
|
| 68 | self.to_restore = self.mem.is_main
|
| 69 | self.mem.is_main = False
|
| 70 |
|
| 71 | def __enter__(self):
|
| 72 | # type: () -> None
|
| 73 | pass
|
| 74 |
|
| 75 | def __exit__(self, type, value, traceback):
|
| 76 | # type: (Any, Any, Any) -> None
|
| 77 | self.mem.PopSource(self.argv)
|
| 78 |
|
| 79 | self.mem.is_main = self.to_restore
|
| 80 |
|
| 81 |
|
| 82 | class ctx_DebugTrap(object):
|
| 83 | """For trap DEBUG."""
|
| 84 |
|
| 85 | def __init__(self, mem):
|
| 86 | # type: (Mem) -> None
|
| 87 | mem.running_debug_trap = True
|
| 88 | self.mem = mem
|
| 89 |
|
| 90 | def __enter__(self):
|
| 91 | # type: () -> None
|
| 92 | pass
|
| 93 |
|
| 94 | def __exit__(self, type, value, traceback):
|
| 95 | # type: (Any, Any, Any) -> None
|
| 96 | self.mem.running_debug_trap = False
|
| 97 |
|
| 98 |
|
| 99 | class ctx_ErrTrap(object):
|
| 100 | """For trap ERR."""
|
| 101 |
|
| 102 | def __init__(self, mem):
|
| 103 | # type: (Mem) -> None
|
| 104 | mem.running_err_trap = True
|
| 105 | self.mem = mem
|
| 106 |
|
| 107 | def __enter__(self):
|
| 108 | # type: () -> None
|
| 109 | pass
|
| 110 |
|
| 111 | def __exit__(self, type, value, traceback):
|
| 112 | # type: (Any, Any, Any) -> None
|
| 113 | self.mem.running_err_trap = False
|
| 114 |
|
| 115 |
|
| 116 | class ctx_Option(object):
|
| 117 | """Shopt --unset errexit { false }"""
|
| 118 |
|
| 119 | def __init__(self, mutable_opts, opt_nums, b):
|
| 120 | # type: (MutableOpts, List[int], bool) -> None
|
| 121 | for opt_num in opt_nums:
|
| 122 | mutable_opts.Push(opt_num, b)
|
| 123 | if opt_num == option_i.errexit:
|
| 124 | # it wasn't disabled
|
| 125 | mutable_opts.errexit_disabled_tok.append(None)
|
| 126 |
|
| 127 | self.mutable_opts = mutable_opts
|
| 128 | self.opt_nums = opt_nums
|
| 129 |
|
| 130 | def __enter__(self):
|
| 131 | # type: () -> None
|
| 132 | pass
|
| 133 |
|
| 134 | def __exit__(self, type, value, traceback):
|
| 135 | # type: (Any, Any, Any) -> None
|
| 136 | for opt_num in self.opt_nums: # don't bother to do it in reverse order
|
| 137 | if opt_num == option_i.errexit:
|
| 138 | self.mutable_opts.errexit_disabled_tok.pop()
|
| 139 | self.mutable_opts.Pop(opt_num)
|
| 140 |
|
| 141 |
|
| 142 | class ctx_AssignBuiltin(object):
|
| 143 | """Local x=$(false) is disallowed."""
|
| 144 |
|
| 145 | def __init__(self, mutable_opts):
|
| 146 | # type: (MutableOpts) -> None
|
| 147 | self.strict = False
|
| 148 | if mutable_opts.Get(option_i.strict_errexit):
|
| 149 | mutable_opts.Push(option_i._allow_command_sub, False)
|
| 150 | mutable_opts.Push(option_i._allow_process_sub, False)
|
| 151 | self.strict = True
|
| 152 |
|
| 153 | self.mutable_opts = mutable_opts
|
| 154 |
|
| 155 | def __enter__(self):
|
| 156 | # type: () -> None
|
| 157 | pass
|
| 158 |
|
| 159 | def __exit__(self, type, value, traceback):
|
| 160 | # type: (Any, Any, Any) -> None
|
| 161 | if self.strict:
|
| 162 | self.mutable_opts.Pop(option_i._allow_command_sub)
|
| 163 | self.mutable_opts.Pop(option_i._allow_process_sub)
|
| 164 |
|
| 165 |
|
| 166 | class ctx_YshExpr(object):
|
| 167 | """Command sub must fail in 'mystring' ++ $(false)"""
|
| 168 |
|
| 169 | def __init__(self, mutable_opts):
|
| 170 | # type: (MutableOpts) -> None
|
| 171 |
|
| 172 | # Similar to $LIB_OSH/bash-strict.sh
|
| 173 |
|
| 174 | # TODO: consider errexit:all group, or even ysh:all
|
| 175 | # It would be nice if this were more efficient
|
| 176 | mutable_opts.Push(option_i.command_sub_errexit, True)
|
| 177 | mutable_opts.Push(option_i.errexit, True)
|
| 178 | mutable_opts.Push(option_i.pipefail, True)
|
| 179 | mutable_opts.Push(option_i.inherit_errexit, True)
|
| 180 | mutable_opts.Push(option_i.strict_errexit, True)
|
| 181 |
|
| 182 | # What about nounset? This has a similar pitfall -- it's not running
|
| 183 | # like YSH.
|
| 184 | # e.g. var x = $(echo $zz)
|
| 185 |
|
| 186 | self.mutable_opts = mutable_opts
|
| 187 |
|
| 188 | def __enter__(self):
|
| 189 | # type: () -> None
|
| 190 | pass
|
| 191 |
|
| 192 | def __exit__(self, type, value, traceback):
|
| 193 | # type: (Any, Any, Any) -> None
|
| 194 | self.mutable_opts.Pop(option_i.command_sub_errexit)
|
| 195 | self.mutable_opts.Pop(option_i.errexit)
|
| 196 | self.mutable_opts.Pop(option_i.pipefail)
|
| 197 | self.mutable_opts.Pop(option_i.inherit_errexit)
|
| 198 | self.mutable_opts.Pop(option_i.strict_errexit)
|
| 199 |
|
| 200 |
|
| 201 | class ctx_ErrExit(object):
|
| 202 | """Manages the errexit setting.
|
| 203 |
|
| 204 | - The user can change it with builtin 'set' at any point in the code.
|
| 205 | - These constructs implicitly disable 'errexit':
|
| 206 | - if / while / until conditions
|
| 207 | - ! (part of pipeline)
|
| 208 | - && ||
|
| 209 | """
|
| 210 |
|
| 211 | def __init__(self, mutable_opts, b, disabled_tok):
|
| 212 | # type: (MutableOpts, bool, Optional[Token]) -> None
|
| 213 |
|
| 214 | # If we're disabling it, we need a span ID. If not, then we should NOT
|
| 215 | # have one.
|
| 216 | assert b == (disabled_tok is None)
|
| 217 |
|
| 218 | mutable_opts.Push(option_i.errexit, b)
|
| 219 | mutable_opts.errexit_disabled_tok.append(disabled_tok)
|
| 220 |
|
| 221 | self.strict = False
|
| 222 | if mutable_opts.Get(option_i.strict_errexit):
|
| 223 | mutable_opts.Push(option_i._allow_command_sub, False)
|
| 224 | mutable_opts.Push(option_i._allow_process_sub, False)
|
| 225 | self.strict = True
|
| 226 |
|
| 227 | self.mutable_opts = mutable_opts
|
| 228 |
|
| 229 | def __enter__(self):
|
| 230 | # type: () -> None
|
| 231 | pass
|
| 232 |
|
| 233 | def __exit__(self, type, value, traceback):
|
| 234 | # type: (Any, Any, Any) -> None
|
| 235 | self.mutable_opts.errexit_disabled_tok.pop()
|
| 236 | self.mutable_opts.Pop(option_i.errexit)
|
| 237 |
|
| 238 | if self.strict:
|
| 239 | self.mutable_opts.Pop(option_i._allow_command_sub)
|
| 240 | self.mutable_opts.Pop(option_i._allow_process_sub)
|
| 241 |
|
| 242 |
|
| 243 | class OptHook(object):
|
| 244 | """Interface for option hooks."""
|
| 245 |
|
| 246 | def __init__(self):
|
| 247 | # type: () -> None
|
| 248 | """Empty constructor for mycpp."""
|
| 249 | pass
|
| 250 |
|
| 251 | def OnChange(self, opt0_array, opt_name, b):
|
| 252 | # type: (List[bool], str, bool) -> bool
|
| 253 | """This method is called whenever an option is changed.
|
| 254 |
|
| 255 | Returns success or failure.
|
| 256 | """
|
| 257 | return True
|
| 258 |
|
| 259 |
|
| 260 | def InitOpts():
|
| 261 | # type: () -> List[bool]
|
| 262 |
|
| 263 | opt0_array = [False] * option_i.ARRAY_SIZE
|
| 264 | for opt_num in consts.DEFAULT_TRUE:
|
| 265 | opt0_array[opt_num] = True
|
| 266 | return opt0_array
|
| 267 |
|
| 268 |
|
| 269 | def MakeOpts(mem, environ, opt_hook):
|
| 270 | # type: (Mem, Dict[str, str], OptHook) -> Tuple[optview.Parse, optview.Exec, MutableOpts]
|
| 271 |
|
| 272 | # Unusual representation: opt0_array + opt_stacks. For two features:
|
| 273 | #
|
| 274 | # - POSIX errexit disable semantics
|
| 275 | # - YSH shopt --set nullglob { ... }
|
| 276 | #
|
| 277 | # We could do it with a single List of stacks. But because shopt --set
|
| 278 | # random_option { ... } is very uncommon, we optimize and store the ZERO
|
| 279 | # element of the stack in a flat array opt0_array (default False), and then
|
| 280 | # the rest in opt_stacks, where the value could be None. By allowing the
|
| 281 | # None value, we save ~50 or so list objects in the common case.
|
| 282 |
|
| 283 | opt0_array = InitOpts()
|
| 284 | # Overrides, including errexit
|
| 285 | no_stack = None # type: List[bool] # for mycpp
|
| 286 | opt_stacks = [no_stack] * option_i.ARRAY_SIZE # type: List[List[bool]]
|
| 287 |
|
| 288 | parse_opts = optview.Parse(opt0_array, opt_stacks)
|
| 289 | exec_opts = optview.Exec(opt0_array, opt_stacks)
|
| 290 | mutable_opts = MutableOpts(mem, environ, opt0_array, opt_stacks, opt_hook)
|
| 291 |
|
| 292 | return parse_opts, exec_opts, mutable_opts
|
| 293 |
|
| 294 |
|
| 295 | def _SetGroup(opt0_array, opt_nums, b):
|
| 296 | # type: (List[bool], List[int], bool) -> None
|
| 297 | for opt_num in opt_nums:
|
| 298 | b2 = not b if opt_num in consts.DEFAULT_TRUE else b
|
| 299 | opt0_array[opt_num] = b2
|
| 300 |
|
| 301 |
|
| 302 | def MakeYshParseOpts():
|
| 303 | # type: () -> optview.Parse
|
| 304 | opt0_array = InitOpts()
|
| 305 | _SetGroup(opt0_array, consts.YSH_ALL, True)
|
| 306 |
|
| 307 | no_stack = None # type: List[bool]
|
| 308 | opt_stacks = [no_stack] * option_i.ARRAY_SIZE # type: List[List[bool]]
|
| 309 |
|
| 310 | parse_opts = optview.Parse(opt0_array, opt_stacks)
|
| 311 | return parse_opts
|
| 312 |
|
| 313 |
|
| 314 | def _AnyOptionNum(opt_name, ignore_shopt_not_impl):
|
| 315 | # type: (str, bool) -> option_t
|
| 316 | opt_num = consts.OptionNum(opt_name)
|
| 317 | if opt_num == 0:
|
| 318 | if ignore_shopt_not_impl:
|
| 319 | opt_num = consts.UnimplOptionNum(opt_name)
|
| 320 | if opt_num == 0:
|
| 321 | e_usage('got invalid option %r' % opt_name, loc.Missing)
|
| 322 |
|
| 323 | # Note: we relaxed this for YSH so we can do 'shopt --unset errexit' consistently
|
| 324 | #if opt_num not in consts.SHOPT_OPTION_NUMS:
|
| 325 | # e_usage("doesn't own option %r (try 'set')" % opt_name)
|
| 326 |
|
| 327 | return opt_num
|
| 328 |
|
| 329 |
|
| 330 | def _SetOptionNum(opt_name):
|
| 331 | # type: (str) -> option_t
|
| 332 | opt_num = consts.OptionNum(opt_name)
|
| 333 | if opt_num == 0:
|
| 334 | e_usage('got invalid option %r' % opt_name, loc.Missing)
|
| 335 |
|
| 336 | if opt_num not in consts.SET_OPTION_NUMS:
|
| 337 | e_usage("invalid option %r (try shopt)" % opt_name, loc.Missing)
|
| 338 |
|
| 339 | return opt_num
|
| 340 |
|
| 341 |
|
| 342 | class MutableOpts(object):
|
| 343 |
|
| 344 | def __init__(self, mem, environ, opt0_array, opt_stacks, opt_hook):
|
| 345 | # type: (Mem, Dict[str, str], List[bool], List[List[bool]], OptHook) -> None
|
| 346 | self.mem = mem
|
| 347 | self.environ = environ
|
| 348 | self.opt0_array = opt0_array
|
| 349 | self.opt_stacks = opt_stacks
|
| 350 | self.errexit_disabled_tok = [] # type: List[Token]
|
| 351 |
|
| 352 | # Used for 'set -o vi/emacs'
|
| 353 | self.opt_hook = opt_hook
|
| 354 |
|
| 355 | def Init(self):
|
| 356 | # type: () -> None
|
| 357 |
|
| 358 | # This comes after all the 'set' options.
|
| 359 | shellopts = self.mem.GetValue('SHELLOPTS')
|
| 360 |
|
| 361 | # True in OSH, but not in YSH (no_init_globals)
|
| 362 | if shellopts.tag() == value_e.Str:
|
| 363 | s = cast(value.Str, shellopts).s
|
| 364 | self._InitOptionsFromEnv(s)
|
| 365 |
|
| 366 | def _InitOptionsFromEnv(self, shellopts):
|
| 367 | # type: (str) -> None
|
| 368 | # e.g. errexit:nounset:pipefail
|
| 369 | lookup = shellopts.split(':')
|
| 370 | for opt_num in consts.SET_OPTION_NUMS:
|
| 371 | name = consts.OptionName(opt_num)
|
| 372 | if name in lookup:
|
| 373 | self._SetOldOption(name, True)
|
| 374 |
|
| 375 | def Push(self, opt_num, b):
|
| 376 | # type: (int, bool) -> None
|
| 377 | overlay = self.opt_stacks[opt_num]
|
| 378 | if overlay is None or len(overlay) == 0:
|
| 379 | self.opt_stacks[opt_num] = [b] # Allocate a new list
|
| 380 | else:
|
| 381 | overlay.append(b)
|
| 382 |
|
| 383 | def Pop(self, opt_num):
|
| 384 | # type: (int) -> bool
|
| 385 | overlay = self.opt_stacks[opt_num]
|
| 386 | assert overlay is not None
|
| 387 | return overlay.pop()
|
| 388 |
|
| 389 | def PushDynamicScope(self, b):
|
| 390 | # type: (bool) -> None
|
| 391 | """B: False if it's a proc, and True if it's a shell function."""
|
| 392 | # If it's already disabled, keep it disabled
|
| 393 | if not self.Get(option_i.dynamic_scope):
|
| 394 | b = False
|
| 395 | self.Push(option_i.dynamic_scope, b)
|
| 396 |
|
| 397 | def PopDynamicScope(self):
|
| 398 | # type: () -> None
|
| 399 | self.Pop(option_i.dynamic_scope)
|
| 400 |
|
| 401 | def Get(self, opt_num):
|
| 402 | # type: (int) -> bool
|
| 403 | # Like _Getter in core/optview.py
|
| 404 | overlay = self.opt_stacks[opt_num]
|
| 405 | if overlay is None or len(overlay) == 0:
|
| 406 | return self.opt0_array[opt_num]
|
| 407 | else:
|
| 408 | return overlay[-1] # the top value
|
| 409 |
|
| 410 | def _Set(self, opt_num, b):
|
| 411 | # type: (int, bool) -> None
|
| 412 | """Used to disable errexit.
|
| 413 |
|
| 414 | For bash compatibility in command sub.
|
| 415 | """
|
| 416 |
|
| 417 | # Like _Getter in core/optview.py
|
| 418 | overlay = self.opt_stacks[opt_num]
|
| 419 | if overlay is None or len(overlay) == 0:
|
| 420 | self.opt0_array[opt_num] = b
|
| 421 | else:
|
| 422 | overlay[-1] = b # The top value
|
| 423 |
|
| 424 | def set_interactive(self):
|
| 425 | # type: () -> None
|
| 426 | self._Set(option_i.interactive, True)
|
| 427 |
|
| 428 | def set_redefine_const(self):
|
| 429 | # type: () -> None
|
| 430 | """For interactive shells."""
|
| 431 | self._Set(option_i.redefine_const, True)
|
| 432 |
|
| 433 | def set_redefine_source(self):
|
| 434 | # type: () -> None
|
| 435 | """For interactive shells. For source-guard"""
|
| 436 | self._Set(option_i.redefine_source, True)
|
| 437 |
|
| 438 | def set_emacs(self):
|
| 439 | # type: () -> None
|
| 440 | self._Set(option_i.emacs, True)
|
| 441 |
|
| 442 | def _SetArrayByNum(self, opt_num, b):
|
| 443 | # type: (int, bool) -> None
|
| 444 | if (opt_num in consts.PARSE_OPTION_NUMS and
|
| 445 | not self.mem.ParsingChangesAllowed()):
|
| 446 | e_die('Syntax options must be set at the top level '
|
| 447 | '(outside any function)')
|
| 448 |
|
| 449 | self._Set(opt_num, b)
|
| 450 |
|
| 451 | def SetDeferredErrExit(self, b):
|
| 452 | # type: (bool) -> None
|
| 453 | """Set the errexit flag, possibly deferring it.
|
| 454 |
|
| 455 | Implements the unusual POSIX "defer" behavior. Callers: set -o
|
| 456 | errexit, shopt -s ysh:all, ysh:upgrade
|
| 457 | """
|
| 458 | #log('Set %s', b)
|
| 459 |
|
| 460 | # Defer it until we pop by setting the BOTTOM OF THE STACK.
|
| 461 | self.opt0_array[option_i.errexit] = b
|
| 462 |
|
| 463 | def DisableErrExit(self):
|
| 464 | # type: () -> None
|
| 465 | """Called by core/process.py to implement bash quirks."""
|
| 466 | self._Set(option_i.errexit, False)
|
| 467 |
|
| 468 | def ErrExitDisabledToken(self):
|
| 469 | # type: () -> Optional[Token]
|
| 470 | """If errexit is disabled by POSIX rules, return Token for construct.
|
| 471 |
|
| 472 | e.g. the Token for 'if' or '&&' etc.
|
| 473 | """
|
| 474 | # Bug fix: The errexit disabling inherently follows a STACK DISCIPLINE.
|
| 475 | # But we run trap handlers in the MAIN LOOP, which break this. So just
|
| 476 | # declare that it's never disabled in a trap.
|
| 477 | if self.Get(option_i._running_trap):
|
| 478 | return None
|
| 479 |
|
| 480 | if len(self.errexit_disabled_tok) == 0:
|
| 481 | return None
|
| 482 |
|
| 483 | return self.errexit_disabled_tok[-1]
|
| 484 |
|
| 485 | def ErrExitIsDisabled(self):
|
| 486 | # type: () -> bool
|
| 487 | """
|
| 488 | Similar to ErrExitDisabledToken, for ERR trap
|
| 489 | """
|
| 490 | if len(self.errexit_disabled_tok) == 0:
|
| 491 | return False
|
| 492 |
|
| 493 | return self.errexit_disabled_tok[-1] is not None
|
| 494 |
|
| 495 | def _SetOldOption(self, opt_name, b):
|
| 496 | # type: (str, bool) -> None
|
| 497 | """Private version for synchronizing from SHELLOPTS."""
|
| 498 | assert '_' not in opt_name
|
| 499 | assert opt_name in consts.SET_OPTION_NAMES
|
| 500 |
|
| 501 | opt_num = consts.OptionNum(opt_name)
|
| 502 | assert opt_num != 0, opt_name
|
| 503 |
|
| 504 | if opt_num == option_i.errexit:
|
| 505 | self.SetDeferredErrExit(b)
|
| 506 | else:
|
| 507 | if opt_num == option_i.verbose and b:
|
| 508 | print_stderr('Warning: set -o verbose not implemented')
|
| 509 | self._SetArrayByNum(opt_num, b)
|
| 510 |
|
| 511 | # note: may FAIL before we get here.
|
| 512 |
|
| 513 | success = self.opt_hook.OnChange(self.opt0_array, opt_name, b)
|
| 514 |
|
| 515 | def SetOldOption(self, opt_name, b):
|
| 516 | # type: (str, bool) -> None
|
| 517 | """For set -o, set +o, or shopt -s/-u -o."""
|
| 518 | unused = _SetOptionNum(opt_name) # validate it
|
| 519 | self._SetOldOption(opt_name, b)
|
| 520 |
|
| 521 | if not self.Get(option_i.no_init_globals):
|
| 522 | UP_val = self.mem.GetValue('SHELLOPTS')
|
| 523 | assert UP_val.tag() == value_e.Str, UP_val
|
| 524 | val = cast(value.Str, UP_val)
|
| 525 | shellopts = val.s
|
| 526 |
|
| 527 | # Now check if SHELLOPTS needs to be updated. It may be exported.
|
| 528 | #
|
| 529 | # NOTE: It might be better to skip rewriting SEHLLOPTS in the common case
|
| 530 | # where it is not used. We could do it lazily upon GET.
|
| 531 |
|
| 532 | # Also, it would be slightly more efficient to update SHELLOPTS if
|
| 533 | # settings were batched, Examples:
|
| 534 | # - set -eu
|
| 535 | # - shopt -s foo bar
|
| 536 | if b:
|
| 537 | if opt_name not in shellopts:
|
| 538 | new_val = value.Str('%s:%s' % (shellopts, opt_name))
|
| 539 | self.mem.InternalSetGlobal('SHELLOPTS', new_val)
|
| 540 | else:
|
| 541 | if opt_name in shellopts:
|
| 542 | names = [n for n in shellopts.split(':') if n != opt_name]
|
| 543 | new_val = value.Str(':'.join(names))
|
| 544 | self.mem.InternalSetGlobal('SHELLOPTS', new_val)
|
| 545 |
|
| 546 | def SetAnyOption(self, opt_name, b, ignore_shopt_not_impl=False):
|
| 547 | # type: (str, bool, bool) -> None
|
| 548 | """For shopt -s/-u and sh -O/+O."""
|
| 549 |
|
| 550 | # shopt -s ysh:all turns on all YSH options, which includes all strict
|
| 551 | # options
|
| 552 | opt_group = consts.OptionGroupNum(opt_name)
|
| 553 | if opt_group == opt_group_i.YshUpgrade:
|
| 554 | _SetGroup(self.opt0_array, consts.YSH_UPGRADE, b)
|
| 555 | self.SetDeferredErrExit(b) # Special case
|
| 556 | if b: # ENV dict
|
| 557 | self.mem.MaybeInitEnvDict(self.environ)
|
| 558 | return
|
| 559 |
|
| 560 | if opt_group == opt_group_i.YshAll:
|
| 561 | _SetGroup(self.opt0_array, consts.YSH_ALL, b)
|
| 562 | self.SetDeferredErrExit(b) # Special case
|
| 563 | if b: # ENV dict
|
| 564 | self.mem.MaybeInitEnvDict(self.environ)
|
| 565 | return
|
| 566 |
|
| 567 | if opt_group == opt_group_i.StrictAll:
|
| 568 | _SetGroup(self.opt0_array, consts.STRICT_ALL, b)
|
| 569 | return
|
| 570 |
|
| 571 | opt_num = _AnyOptionNum(opt_name, ignore_shopt_not_impl)
|
| 572 |
|
| 573 | if opt_num == option_i.errexit:
|
| 574 | self.SetDeferredErrExit(b)
|
| 575 | return
|
| 576 |
|
| 577 | self._SetArrayByNum(opt_num, b)
|
| 578 |
|
| 579 |
|
| 580 | class _ArgFrame(object):
|
| 581 | """Stack frame for arguments array."""
|
| 582 |
|
| 583 | def __init__(self, argv):
|
| 584 | # type: (List[str]) -> None
|
| 585 | self.argv = argv
|
| 586 | self.num_shifted = 0
|
| 587 |
|
| 588 | def __repr__(self):
|
| 589 | # type: () -> str
|
| 590 | return '<_ArgFrame %s %d at %x>' % (self.argv, self.num_shifted,
|
| 591 | id(self))
|
| 592 |
|
| 593 | def Dump(self):
|
| 594 | # type: () -> Dict[str, value_t]
|
| 595 | items = [value.Str(s) for s in self.argv] # type: List[value_t]
|
| 596 | argv = value.List(items)
|
| 597 | return {
|
| 598 | 'argv': argv,
|
| 599 | 'num_shifted': num.ToBig(self.num_shifted),
|
| 600 | }
|
| 601 |
|
| 602 | def GetArgNum(self, arg_num):
|
| 603 | # type: (int) -> value_t
|
| 604 |
|
| 605 | # $0 is handled elsewhere
|
| 606 | assert 1 <= arg_num, arg_num
|
| 607 |
|
| 608 | index = self.num_shifted + arg_num - 1
|
| 609 | if index >= len(self.argv):
|
| 610 | return value.Undef
|
| 611 |
|
| 612 | return value.Str(self.argv[index])
|
| 613 |
|
| 614 | def GetArgv(self):
|
| 615 | # type: () -> List[str]
|
| 616 | return self.argv[self.num_shifted:]
|
| 617 |
|
| 618 | def GetNumArgs(self):
|
| 619 | # type: () -> int
|
| 620 | return len(self.argv) - self.num_shifted
|
| 621 |
|
| 622 | def SetArgv(self, argv):
|
| 623 | # type: (List[str]) -> None
|
| 624 | self.argv = argv
|
| 625 | self.num_shifted = 0
|
| 626 |
|
| 627 |
|
| 628 | def _DumpVarFrame(frame):
|
| 629 | # type: (Dict[str, Cell]) -> Dict[str, value_t]
|
| 630 | """Dump the stack frame as reasonably compact and readable JSON."""
|
| 631 |
|
| 632 | vars_json = {} # type: Dict[str, value_t]
|
| 633 | for name, cell in iteritems(frame):
|
| 634 | cell_json = {} # type: Dict[str, value_t]
|
| 635 |
|
| 636 | buf = mylib.BufWriter()
|
| 637 | if cell.exported:
|
| 638 | buf.write('x')
|
| 639 | if cell.readonly:
|
| 640 | buf.write('r')
|
| 641 | flags = buf.getvalue()
|
| 642 | if len(flags):
|
| 643 | cell_json['flags'] = value.Str(flags)
|
| 644 |
|
| 645 | # TODO:
|
| 646 | # - Use packle for crash dumps! Then we can represent object cycles
|
| 647 | # - Right now the JSON serializer will probably crash
|
| 648 | # - although BashArray and BashAssoc may need 'type' tags
|
| 649 | # - they don't round trip correctly
|
| 650 | # - maybe add value.Tombstone here or something?
|
| 651 | # - value.{Func,Eggex,...} may have value.Tombstone and
|
| 652 | # vm.ValueIdString()?
|
| 653 |
|
| 654 | with tagswitch(cell.val) as case:
|
| 655 | if case(value_e.Undef):
|
| 656 | cell_json['val'] = value.Null
|
| 657 |
|
| 658 | elif case(value_e.Str, value_e.BashArray, value_e.BashAssoc):
|
| 659 | cell_json['val'] = cell.val
|
| 660 |
|
| 661 | else:
|
| 662 | # TODO: should we show the object ID here?
|
| 663 | pass
|
| 664 |
|
| 665 | vars_json[name] = value.Dict(cell_json)
|
| 666 |
|
| 667 | return vars_json
|
| 668 |
|
| 669 |
|
| 670 | def _LineNumber(tok):
|
| 671 | # type: (Optional[Token]) -> str
|
| 672 | """ For $BASH_LINENO """
|
| 673 | if tok is None:
|
| 674 | return '-1'
|
| 675 | return str(tok.line.line_num)
|
| 676 |
|
| 677 |
|
| 678 | def _AddCallToken(d, token):
|
| 679 | # type: (Dict[str, value_t], Optional[Token]) -> None
|
| 680 | if token is None:
|
| 681 | return
|
| 682 | d['call_source'] = value.Str(ui.GetLineSourceString(token.line))
|
| 683 | d['call_line_num'] = num.ToBig(token.line.line_num)
|
| 684 | d['call_line'] = value.Str(token.line.content)
|
| 685 |
|
| 686 |
|
| 687 | class ctx_FuncCall(object):
|
| 688 | """For func calls."""
|
| 689 |
|
| 690 | def __init__(self, mem, func):
|
| 691 | # type: (Mem, value.Func) -> None
|
| 692 |
|
| 693 | self.saved_globals = mem.var_stack[0]
|
| 694 |
|
| 695 | assert func.module_frame is not None
|
| 696 | mem.var_stack[0] = func.module_frame
|
| 697 |
|
| 698 | frame = NewDict() # type: Dict[str, Cell]
|
| 699 | mem.var_stack.append(frame)
|
| 700 |
|
| 701 | mem.PushCall(func.name, func.parsed.name)
|
| 702 |
|
| 703 | self.mem = mem
|
| 704 |
|
| 705 | def __enter__(self):
|
| 706 | # type: () -> None
|
| 707 | pass
|
| 708 |
|
| 709 | def __exit__(self, type, value, traceback):
|
| 710 | # type: (Any, Any, Any) -> None
|
| 711 | self.mem.PopCall()
|
| 712 | self.mem.var_stack.pop()
|
| 713 |
|
| 714 | self.mem.var_stack[0] = self.saved_globals
|
| 715 |
|
| 716 |
|
| 717 | class ctx_ProcCall(object):
|
| 718 | """For proc calls, including shell functions."""
|
| 719 |
|
| 720 | def __init__(self, mem, mutable_opts, proc, argv):
|
| 721 | # type: (Mem, MutableOpts, value.Proc, List[str]) -> None
|
| 722 |
|
| 723 | # TODO:
|
| 724 | # should we separate procs and shell functions?
|
| 725 | # - dynamic scope is one difference
|
| 726 | # - '$@" shift etc. are another difference
|
| 727 |
|
| 728 | self.saved_globals = mem.var_stack[0]
|
| 729 |
|
| 730 | assert proc.module_frame is not None
|
| 731 | mem.var_stack[0] = proc.module_frame
|
| 732 |
|
| 733 | frame = NewDict() # type: Dict[str, Cell]
|
| 734 |
|
| 735 | assert argv is not None
|
| 736 | if proc.sh_compat:
|
| 737 | # shell function
|
| 738 | mem.argv_stack.append(_ArgFrame(argv))
|
| 739 | else:
|
| 740 | # procs
|
| 741 | # - open: is equivalent to ...ARGV
|
| 742 | # - closed: ARGV is empty list
|
| 743 | frame['ARGV'] = _MakeArgvCell(argv)
|
| 744 |
|
| 745 | mem.var_stack.append(frame)
|
| 746 |
|
| 747 | mem.PushCall(proc.name, proc.name_tok)
|
| 748 |
|
| 749 | # Dynamic scope is only for shell functions
|
| 750 | mutable_opts.PushDynamicScope(proc.sh_compat)
|
| 751 |
|
| 752 | # It may have been disabled with ctx_ErrExit for 'if echo $(false)', but
|
| 753 | # 'if p' should be allowed.
|
| 754 | self.mem = mem
|
| 755 | self.mutable_opts = mutable_opts
|
| 756 | self.sh_compat = proc.sh_compat
|
| 757 |
|
| 758 | def __enter__(self):
|
| 759 | # type: () -> None
|
| 760 | pass
|
| 761 |
|
| 762 | def __exit__(self, type, value, traceback):
|
| 763 | # type: (Any, Any, Any) -> None
|
| 764 | self.mutable_opts.PopDynamicScope()
|
| 765 | self.mem.PopCall()
|
| 766 | self.mem.var_stack.pop()
|
| 767 |
|
| 768 | if self.sh_compat:
|
| 769 | self.mem.argv_stack.pop()
|
| 770 |
|
| 771 | self.mem.var_stack[0] = self.saved_globals
|
| 772 |
|
| 773 |
|
| 774 | class ctx_Temp(object):
|
| 775 | """ POSIX shell FOO=bar mycommand """
|
| 776 |
|
| 777 | def __init__(self, mem):
|
| 778 | # type: (Mem) -> None
|
| 779 | self.mem = mem
|
| 780 | mem.PushTemp()
|
| 781 |
|
| 782 | def __enter__(self):
|
| 783 | # type: () -> None
|
| 784 | pass
|
| 785 |
|
| 786 | def __exit__(self, type, value, traceback):
|
| 787 | # type: (Any, Any, Any) -> None
|
| 788 | self.mem.PopTemp()
|
| 789 |
|
| 790 |
|
| 791 | class ctx_EnvObj(object):
|
| 792 | """YSH FOO=bar my-command"""
|
| 793 |
|
| 794 | def __init__(self, mem, bindings):
|
| 795 | # type: (Mem, Dict[str, value_t]) -> None
|
| 796 | self.mem = mem
|
| 797 | mem.PushEnvObj(bindings)
|
| 798 |
|
| 799 | def __enter__(self):
|
| 800 | # type: () -> None
|
| 801 | pass
|
| 802 |
|
| 803 | def __exit__(self, type, value, traceback):
|
| 804 | # type: (Any, Any, Any) -> None
|
| 805 | self.mem.PopEnvObj()
|
| 806 |
|
| 807 |
|
| 808 | class ctx_Registers(object):
|
| 809 | """For $PS1, $PS4, $PROMPT_COMMAND, traps, and headless EVAL.
|
| 810 |
|
| 811 | This is tightly coupled to state.Mem, so it's not in builtin/pure_ysh.
|
| 812 | """
|
| 813 |
|
| 814 | def __init__(self, mem):
|
| 815 | # type: (Mem) -> None
|
| 816 |
|
| 817 | # Because some prompts rely on the status leaking. See issue #853.
|
| 818 | # PS1 also does.
|
| 819 | last = mem.last_status[-1]
|
| 820 | mem.last_status.append(last)
|
| 821 | mem.try_status.append(0)
|
| 822 | mem.try_error.append(value.Dict({}))
|
| 823 |
|
| 824 | # TODO: We should also copy these values! Turn the whole thing into a
|
| 825 | # frame.
|
| 826 | mem.pipe_status.append([])
|
| 827 | mem.process_sub_status.append([])
|
| 828 |
|
| 829 | mem.regex_match.append(regex_match.No)
|
| 830 |
|
| 831 | self.mem = mem
|
| 832 |
|
| 833 | def __enter__(self):
|
| 834 | # type: () -> None
|
| 835 | pass
|
| 836 |
|
| 837 | def __exit__(self, type, value, traceback):
|
| 838 | # type: (Any, Any, Any) -> None
|
| 839 | self.mem.regex_match.pop()
|
| 840 |
|
| 841 | self.mem.process_sub_status.pop()
|
| 842 | self.mem.pipe_status.pop()
|
| 843 |
|
| 844 | self.mem.try_error.pop()
|
| 845 | self.mem.try_status.pop()
|
| 846 | self.mem.last_status.pop()
|
| 847 |
|
| 848 |
|
| 849 | class ctx_ThisDir(object):
|
| 850 | """For $_this_dir."""
|
| 851 |
|
| 852 | def __init__(self, mem, filename):
|
| 853 | # type: (Mem, Optional[str]) -> None
|
| 854 | self.do_pop = False
|
| 855 | if filename is not None: # script_name in main() may be -c, etc.
|
| 856 | d = os_path.dirname(os_path.abspath(filename))
|
| 857 | mem.this_dir.append(d)
|
| 858 | self.do_pop = True
|
| 859 |
|
| 860 | self.mem = mem
|
| 861 |
|
| 862 | def __enter__(self):
|
| 863 | # type: () -> None
|
| 864 | pass
|
| 865 |
|
| 866 | def __exit__(self, type, value, traceback):
|
| 867 | # type: (Any, Any, Any) -> None
|
| 868 | if self.do_pop:
|
| 869 | self.mem.this_dir.pop()
|
| 870 |
|
| 871 |
|
| 872 | def _MakeArgvCell(argv):
|
| 873 | # type: (List[str]) -> Cell
|
| 874 | items = [value.Str(a) for a in argv] # type: List[value_t]
|
| 875 | return Cell(False, False, False, value.List(items))
|
| 876 |
|
| 877 |
|
| 878 | class ctx_LoopFrame(object):
|
| 879 |
|
| 880 | def __init__(self, mem, name1):
|
| 881 | # type: (Mem, str) -> None
|
| 882 | self.mem = mem
|
| 883 | self.name1 = name1
|
| 884 | self.do_new_frame = name1 == '__hack__'
|
| 885 |
|
| 886 | if self.do_new_frame:
|
| 887 | to_enclose = self.mem.var_stack[-1]
|
| 888 | self.new_frame = NewDict() # type: Dict[str, Cell]
|
| 889 | self.new_frame['__E__'] = Cell(False, False, False,
|
| 890 | value.Frame(to_enclose))
|
| 891 | mem.var_stack.append(self.new_frame)
|
| 892 |
|
| 893 | def __enter__(self):
|
| 894 | # type: () -> None
|
| 895 | pass
|
| 896 |
|
| 897 | def __exit__(self, type, value, traceback):
|
| 898 | # type: (Any, Any, Any) -> None
|
| 899 | if self.do_new_frame:
|
| 900 | self.mem.var_stack.pop()
|
| 901 |
|
| 902 |
|
| 903 | class ctx_EnclosedFrame(object):
|
| 904 | """
|
| 905 | Usages:
|
| 906 |
|
| 907 | - io->evalToDict(), which is a primitive used for Hay and the Dict proc
|
| 908 | - lexical scope aka static scope for block args to user-defined procs
|
| 909 | - Including the "closures in a loop" problem, which will be used for Hay
|
| 910 |
|
| 911 | var mutated = 'm'
|
| 912 | var shadowed = 's'
|
| 913 |
|
| 914 | Dict (&d) {
|
| 915 | shadowed = 42
|
| 916 | mutated = 'new' # this is equivalent to var mutated
|
| 917 |
|
| 918 | setvar mutated = 'new'
|
| 919 | }
|
| 920 | echo $shadowed # restored to 's'
|
| 921 | echo $mutated # new
|
| 922 |
|
| 923 | Or maybe we disallow the setvar lookup?
|
| 924 | """
|
| 925 |
|
| 926 | def __init__(
|
| 927 | self,
|
| 928 | mem, # type: Mem
|
| 929 | to_enclose, # type: Dict[str, Cell]
|
| 930 | module_frame, # type: Dict[str, Cell]
|
| 931 | out_dict, # type: Optional[Dict[str, value_t]]
|
| 932 | ):
|
| 933 | # type: (...) -> None
|
| 934 | self.mem = mem
|
| 935 | self.to_enclose = to_enclose
|
| 936 | self.module_frame = module_frame
|
| 937 | self.out_dict = out_dict
|
| 938 |
|
| 939 | if module_frame is not None:
|
| 940 | self.saved_globals = self.mem.var_stack[0]
|
| 941 | self.mem.var_stack[0] = module_frame
|
| 942 |
|
| 943 | # __E__ gets a lookup rule
|
| 944 | self.new_frame = NewDict() # type: Dict[str, Cell]
|
| 945 | self.new_frame['__E__'] = Cell(False, False, False,
|
| 946 | value.Frame(to_enclose))
|
| 947 |
|
| 948 | mem.var_stack.append(self.new_frame)
|
| 949 |
|
| 950 | def __enter__(self):
|
| 951 | # type: () -> None
|
| 952 | pass
|
| 953 |
|
| 954 | def __exit__(self, type, value, traceback):
|
| 955 | # type: (Any, Any, Any) -> None
|
| 956 |
|
| 957 | if self.out_dict is not None:
|
| 958 | for name, cell in iteritems(self.new_frame):
|
| 959 | #log('name %r', name)
|
| 960 | #log('cell %r', cell)
|
| 961 |
|
| 962 | # User can hide variables with _ suffix
|
| 963 | # e.g. for i_ in foo bar { echo $i_ }
|
| 964 | if name.endswith('_'):
|
| 965 | continue
|
| 966 |
|
| 967 | self.out_dict[name] = cell.val
|
| 968 |
|
| 969 | # Restore
|
| 970 | self.mem.var_stack.pop()
|
| 971 |
|
| 972 | if self.module_frame is not None:
|
| 973 | self.mem.var_stack[0] = self.saved_globals
|
| 974 |
|
| 975 |
|
| 976 | class ctx_ModuleEval(object):
|
| 977 | """Evaluate a module with a new global stack frame.
|
| 978 |
|
| 979 | e.g. setglobal in the new module doesn't leak
|
| 980 |
|
| 981 | Different from ctx_EnclosedFrame because the new code can't see variables in
|
| 982 | the old frame.
|
| 983 | """
|
| 984 |
|
| 985 | def __init__(self, mem, out_dict, out_errors):
|
| 986 | # type: (Mem, Dict[str, value_t], List[str]) -> None
|
| 987 | self.mem = mem
|
| 988 | self.out_dict = out_dict
|
| 989 | self.out_errors = out_errors
|
| 990 |
|
| 991 | self.new_frame = NewDict() # type: Dict[str, Cell]
|
| 992 | self.saved_frame = mem.var_stack[0]
|
| 993 |
|
| 994 | # Somewhat of a hack for tracing within a module.
|
| 995 | # Other solutions:
|
| 996 | # - PS4 can be __builtin__, but that would break shell compatibility
|
| 997 | # - We can have a separate YSH mechanism that uses a different settings
|
| 998 | # - We probably still want it to be scoped, like shvar PS4=z { ... }
|
| 999 | #
|
| 1000 | # Note: there's a similar issue with HOSTNAME UID EUID etc. But those
|
| 1001 | # could be io.hostname() io.getuid(), or lazy constants, etc.
|
| 1002 |
|
| 1003 | ps4 = self.saved_frame.get('PS4')
|
| 1004 | if ps4:
|
| 1005 | self.new_frame['PS4'] = ps4
|
| 1006 | # ENV is not in __builtins__ because it's mutable -- we want
|
| 1007 | # 'setglobal' to work
|
| 1008 | env = self.saved_frame.get('ENV')
|
| 1009 | if env:
|
| 1010 | self.new_frame['ENV'] = env
|
| 1011 |
|
| 1012 | assert len(mem.var_stack) == 1
|
| 1013 | mem.var_stack[0] = self.new_frame
|
| 1014 |
|
| 1015 | def __enter__(self):
|
| 1016 | # type: () -> None
|
| 1017 | pass
|
| 1018 |
|
| 1019 | def __exit__(self, type, value_, traceback):
|
| 1020 | # type: (Any, Any, Any) -> None
|
| 1021 |
|
| 1022 | assert len(self.mem.var_stack) == 1
|
| 1023 | self.mem.var_stack[0] = self.saved_frame
|
| 1024 |
|
| 1025 | # Now look in __export__ for the list of names to expose
|
| 1026 |
|
| 1027 | cell = self.new_frame.get('__provide__')
|
| 1028 | if cell is None:
|
| 1029 | self.out_errors.append("Module is missing __provide__ List")
|
| 1030 | return
|
| 1031 |
|
| 1032 | provide_val = cell.val
|
| 1033 | with tagswitch(provide_val) as case:
|
| 1034 | if case(value_e.List):
|
| 1035 | for val in cast(value.List, provide_val).items:
|
| 1036 | if val.tag() == value_e.Str:
|
| 1037 | name = cast(value.Str, val).s
|
| 1038 |
|
| 1039 | cell = self.new_frame.get(name)
|
| 1040 | if cell is None:
|
| 1041 | self.out_errors.append(
|
| 1042 | "Name %r was provided, but not defined" % name)
|
| 1043 | continue
|
| 1044 |
|
| 1045 | self.out_dict[name] = cell.val
|
| 1046 | else:
|
| 1047 | self.out_errors.append(
|
| 1048 | "Expected Str in __provide__ List, got %s" %
|
| 1049 | ui.ValType(val))
|
| 1050 |
|
| 1051 | else:
|
| 1052 | self.out_errors.append("__provide__ should be a List, got %s" %
|
| 1053 | ui.ValType(provide_val))
|
| 1054 |
|
| 1055 |
|
| 1056 | class ctx_Eval(object):
|
| 1057 | """Push temporary set of variables, $0, $1, $2, etc."""
|
| 1058 |
|
| 1059 | def __init__(
|
| 1060 | self,
|
| 1061 | mem, # type: Mem
|
| 1062 | dollar0, # type: Optional[str]
|
| 1063 | pos_args, # type: Optional[List[str]]
|
| 1064 | vars, # type: Optional[Dict[str, value_t]]
|
| 1065 | ):
|
| 1066 | # type: (...) -> None
|
| 1067 | self.mem = mem
|
| 1068 | self.dollar0 = dollar0
|
| 1069 | self.pos_args = pos_args
|
| 1070 | self.vars = vars
|
| 1071 |
|
| 1072 | # $0 needs to have lexical scoping. So we store it with other locals.
|
| 1073 | # As "0" cannot be parsed as an lvalue, we can safely store dollar0 there.
|
| 1074 | if dollar0 is not None:
|
| 1075 | #assert mem.GetValue("0", scope_e.LocalOnly).tag() == value_e.Undef
|
| 1076 | #self.dollar0_lval = LeftName("0", loc.Missing)
|
| 1077 | #mem.SetLocalName(self.dollar0_lval, value.Str(dollar0))
|
| 1078 |
|
| 1079 | self.restore_dollar0 = self.mem.dollar0
|
| 1080 | self.mem.dollar0 = dollar0
|
| 1081 |
|
| 1082 | if pos_args is not None:
|
| 1083 | mem.argv_stack.append(_ArgFrame(pos_args))
|
| 1084 |
|
| 1085 | if vars is not None:
|
| 1086 | self.restore = [] # type: List[Tuple[LeftName, value_t]]
|
| 1087 | self._Push(vars)
|
| 1088 |
|
| 1089 | def __enter__(self):
|
| 1090 | # type: () -> None
|
| 1091 | pass
|
| 1092 |
|
| 1093 | def __exit__(self, type, value_, traceback):
|
| 1094 | # type: (Any, Any, Any) -> None
|
| 1095 | if self.vars is not None:
|
| 1096 | self._Pop()
|
| 1097 |
|
| 1098 | if self.pos_args is not None:
|
| 1099 | self.mem.argv_stack.pop()
|
| 1100 |
|
| 1101 | if self.dollar0 is not None:
|
| 1102 | #self.mem.SetLocalName(self.dollar0_lval, value.Undef)
|
| 1103 | self.mem.dollar0 = self.restore_dollar0
|
| 1104 |
|
| 1105 | # Note: _Push and _Pop are separate methods because the C++ translation
|
| 1106 | # doesn't like when they are inline in __init__ and __exit__.
|
| 1107 | def _Push(self, vars):
|
| 1108 | # type: (Dict[str, value_t]) -> None
|
| 1109 | for name in vars:
|
| 1110 | lval = location.LName(name)
|
| 1111 | # LocalOnly because we are only overwriting the current scope
|
| 1112 | old_val = self.mem.GetValue(name, scope_e.LocalOnly)
|
| 1113 | self.restore.append((lval, old_val))
|
| 1114 | self.mem.SetNamed(lval, vars[name], scope_e.LocalOnly)
|
| 1115 |
|
| 1116 | def _Pop(self):
|
| 1117 | # type: () -> None
|
| 1118 | for lval, old_val in self.restore:
|
| 1119 | if old_val.tag() == value_e.Undef:
|
| 1120 | self.mem.Unset(lval, scope_e.LocalOnly)
|
| 1121 | else:
|
| 1122 | self.mem.SetNamed(lval, old_val, scope_e.LocalOnly)
|
| 1123 |
|
| 1124 |
|
| 1125 | def _FrameLookup(frame, name):
|
| 1126 | # type: (Dict[str, Cell], str) -> Tuple[Optional[Cell], Dict[str, Cell]]
|
| 1127 | """
|
| 1128 | Look for a name in the frame, then recursively into the enclosing __E__
|
| 1129 | frame, if it exists
|
| 1130 | """
|
| 1131 | cell = frame.get(name)
|
| 1132 | if cell:
|
| 1133 | return cell, frame
|
| 1134 |
|
| 1135 | rear_cell = frame.get('__E__') # ctx_EnclosedFrame() sets this
|
| 1136 | if rear_cell:
|
| 1137 | rear_val = rear_cell.val
|
| 1138 | assert rear_val, rear_val
|
| 1139 | if rear_val.tag() == value_e.Frame:
|
| 1140 | to_enclose = cast(value.Frame, rear_val).frame
|
| 1141 | return _FrameLookup(to_enclose, name) # recursive call
|
| 1142 |
|
| 1143 | return None, None
|
| 1144 |
|
| 1145 |
|
| 1146 | class Mem(object):
|
| 1147 | """For storing variables.
|
| 1148 |
|
| 1149 | Callers:
|
| 1150 | User code: assigning and evaluating variables, in command context or
|
| 1151 | arithmetic context.
|
| 1152 | Completion engine: for COMP_WORDS, etc.
|
| 1153 | Builtins call it implicitly: read, cd for $PWD, $OLDPWD, etc.
|
| 1154 |
|
| 1155 | Modules: cmd_eval, word_eval, expr_eval, completion
|
| 1156 | """
|
| 1157 |
|
| 1158 | def __init__(self,
|
| 1159 | dollar0,
|
| 1160 | argv,
|
| 1161 | arena,
|
| 1162 | debug_stack,
|
| 1163 | env_dict,
|
| 1164 | defaults=None):
|
| 1165 | # type: (str, List[str], alloc.Arena, List[debug_frame_t], Dict[str, value_t], Dict[str, value_t]) -> None
|
| 1166 | """
|
| 1167 | Args:
|
| 1168 | arena: currently unused
|
| 1169 | """
|
| 1170 | # circular dep initialized out of line
|
| 1171 | self.exec_opts = None # type: optview.Exec
|
| 1172 | self.unsafe_arith = None # type: sh_expr_eval.UnsafeArith
|
| 1173 |
|
| 1174 | self.dollar0 = dollar0
|
| 1175 | # If you only use YSH procs and funcs, this will remain at length 1.
|
| 1176 | self.argv_stack = [_ArgFrame(argv)]
|
| 1177 |
|
| 1178 | frame = NewDict() # type: Dict[str, Cell]
|
| 1179 |
|
| 1180 | frame['ARGV'] = _MakeArgvCell(argv)
|
| 1181 |
|
| 1182 | self.var_stack = [frame]
|
| 1183 |
|
| 1184 | # The debug_stack isn't strictly necessary for execution. We use it
|
| 1185 | # for crash dumps and for 3 parallel arrays: BASH_SOURCE, FUNCNAME, and
|
| 1186 | # BASH_LINENO.
|
| 1187 | self.debug_stack = debug_stack
|
| 1188 |
|
| 1189 | self.env_dict = env_dict
|
| 1190 | self.env_object = Obj(None, env_dict) # initial state
|
| 1191 |
|
| 1192 | if defaults is None: # for unit tests only
|
| 1193 | self.defaults = NewDict() # type: Dict[str, value_t]
|
| 1194 | else:
|
| 1195 | self.defaults = defaults
|
| 1196 |
|
| 1197 | self.pwd = None # type: Optional[str]
|
| 1198 | self.seconds_start = time_.time()
|
| 1199 |
|
| 1200 | self.token_for_line = None # type: Optional[Token]
|
| 1201 | self.loc_for_expr = loc.Missing # type: loc_t
|
| 1202 |
|
| 1203 | self.last_arg = '' # $_ is initially empty, NOT unset
|
| 1204 | self.line_num = value.Str('')
|
| 1205 |
|
| 1206 | # Done ONCE on initialization
|
| 1207 | self.root_pid = posix.getpid()
|
| 1208 |
|
| 1209 | # TODO:
|
| 1210 | # - These are REGISTERS mutated by user code.
|
| 1211 | # - Call it self.reg_stack? with ctx_Registers
|
| 1212 | # - push-registers builtin
|
| 1213 | self.last_status = [0] # type: List[int] # a stack
|
| 1214 | self.try_status = [0] # type: List[int] # a stack
|
| 1215 | self.try_error = [value.Dict({})] # type: List[value.Dict] # a stack
|
| 1216 | self.pipe_status = [[]] # type: List[List[int]] # stack
|
| 1217 | self.process_sub_status = [[]] # type: List[List[int]] # stack
|
| 1218 |
|
| 1219 | # A stack but NOT a register?
|
| 1220 | self.this_dir = [] # type: List[str]
|
| 1221 | self.regex_match = [regex_match.No] # type: List[regex_match_t]
|
| 1222 |
|
| 1223 | self.last_bg_pid = -1 # Uninitialized value mutable public variable
|
| 1224 |
|
| 1225 | self.running_debug_trap = False # set by ctx_DebugTrap()
|
| 1226 | self.running_err_trap = False # set by ctx_ErrTrap
|
| 1227 | self.is_main = True # we start out in main
|
| 1228 |
|
| 1229 | # For the ctx builtin
|
| 1230 | self.ctx_stack = [] # type: List[Dict[str, value_t]]
|
| 1231 |
|
| 1232 | self.builtins = NewDict() # type: Dict[str, value_t]
|
| 1233 |
|
| 1234 | # Note: Python 2 and 3 have __builtins__
|
| 1235 | # This is just for inspection
|
| 1236 | builtins_module = Obj(None, self.builtins)
|
| 1237 |
|
| 1238 | # Code in any module can see __builtins__
|
| 1239 | self.builtins['__builtins__'] = builtins_module
|
| 1240 |
|
| 1241 | self.did_ysh_env = False # only initialize ENV once per process
|
| 1242 |
|
| 1243 | from core import sh_init
|
| 1244 | self.env_config = sh_init.EnvConfig(self, defaults)
|
| 1245 |
|
| 1246 | def __repr__(self):
|
| 1247 | # type: () -> str
|
| 1248 | parts = [] # type: List[str]
|
| 1249 | parts.append('<Mem')
|
| 1250 | for i, frame in enumerate(self.var_stack):
|
| 1251 | parts.append(' -- %d --' % i)
|
| 1252 | for n, v in frame.iteritems():
|
| 1253 | parts.append(' %s %s' % (n, v))
|
| 1254 | parts.append('>')
|
| 1255 | return '\n'.join(parts) + '\n'
|
| 1256 |
|
| 1257 | def AddBuiltin(self, name, val):
|
| 1258 | # type: (str, value_t) -> None
|
| 1259 | self.builtins[name] = val
|
| 1260 |
|
| 1261 | def SetPwd(self, pwd):
|
| 1262 | # type: (str) -> None
|
| 1263 | """Used by builtins."""
|
| 1264 | self.pwd = pwd
|
| 1265 |
|
| 1266 | def ParsingChangesAllowed(self):
|
| 1267 | # type: () -> bool
|
| 1268 | """For checking that syntax options are only used at the top level."""
|
| 1269 |
|
| 1270 | # DISALLOW proc calls : they push argv_stack, var_stack, debug_stack
|
| 1271 | # ALLOW source foo.sh arg1: pushes argv_stack, debug_stack
|
| 1272 | # ALLOW FOO=bar : pushes var_stack
|
| 1273 | return len(self.var_stack) == 1 or len(self.argv_stack) == 1
|
| 1274 |
|
| 1275 | def Dump(self):
|
| 1276 | # type: () -> Tuple[List[value_t], List[value_t], List[value_t]]
|
| 1277 | """Copy state before unwinding the stack."""
|
| 1278 | var_stack = [
|
| 1279 | value.Dict(_DumpVarFrame(frame)) for frame in self.var_stack
|
| 1280 | ] # type: List[value_t]
|
| 1281 | argv_stack = [value.Dict(frame.Dump())
|
| 1282 | for frame in self.argv_stack] # type: List[value_t]
|
| 1283 |
|
| 1284 | debug_stack = [] # type: List[value_t]
|
| 1285 |
|
| 1286 | # Reuse these immutable objects
|
| 1287 | t_call = value.Str('Call')
|
| 1288 | t_source = value.Str('Source')
|
| 1289 | t_main = value.Str('Main')
|
| 1290 |
|
| 1291 | for frame in reversed(self.debug_stack):
|
| 1292 | UP_frame = frame
|
| 1293 | with tagswitch(frame) as case:
|
| 1294 | if case(debug_frame_e.Call):
|
| 1295 | frame = cast(debug_frame.Call, UP_frame)
|
| 1296 | d = {
|
| 1297 | 'type': t_call,
|
| 1298 | 'func_name': value.Str(frame.func_name)
|
| 1299 | } # type: Dict[str, value_t]
|
| 1300 |
|
| 1301 | _AddCallToken(d, frame.call_tok)
|
| 1302 | # TODO: Add def_tok
|
| 1303 |
|
| 1304 | elif case(debug_frame_e.Source):
|
| 1305 | frame = cast(debug_frame.Source, UP_frame)
|
| 1306 | d = {
|
| 1307 | 'type': t_source,
|
| 1308 | 'source_name': value.Str(frame.source_name)
|
| 1309 | }
|
| 1310 | _AddCallToken(d, frame.call_tok)
|
| 1311 |
|
| 1312 | elif case(debug_frame_e.Main):
|
| 1313 | frame = cast(debug_frame.Main, UP_frame)
|
| 1314 | d = {'type': t_main, 'dollar0': value.Str(frame.dollar0)}
|
| 1315 |
|
| 1316 | debug_stack.append(value.Dict(d))
|
| 1317 | return var_stack, argv_stack, debug_stack
|
| 1318 |
|
| 1319 | def SetLastArgument(self, s):
|
| 1320 | # type: (str) -> None
|
| 1321 | """For $_"""
|
| 1322 | self.last_arg = s
|
| 1323 |
|
| 1324 | def SetTokenForLine(self, tok):
|
| 1325 | # type: (Token) -> None
|
| 1326 | """Set a token to compute $LINENO
|
| 1327 |
|
| 1328 | This means it should be set on SimpleCommand, ShAssignment, ((, [[,
|
| 1329 | case, etc. -- anything that evaluates a word. Example: there was a bug
|
| 1330 | with 'case $LINENO'
|
| 1331 |
|
| 1332 | This token also used as a "least-specific" / fallback location for
|
| 1333 | errors in ExecuteAndCatch().
|
| 1334 |
|
| 1335 | Although most of that should be taken over by 'with ui.ctx_Location()`,
|
| 1336 | for the errfmt.
|
| 1337 | """
|
| 1338 | if self.running_debug_trap or self.running_err_trap:
|
| 1339 | return
|
| 1340 |
|
| 1341 | #if tok.span_id == runtime.NO_SPID:
|
| 1342 | # NOTE: This happened in the osh-runtime benchmark for yash.
|
| 1343 | #log('Warning: span_id undefined in SetTokenForLine')
|
| 1344 |
|
| 1345 | #import traceback
|
| 1346 | #traceback.print_stack()
|
| 1347 | #return
|
| 1348 |
|
| 1349 | self.token_for_line = tok
|
| 1350 |
|
| 1351 | def SetLocationForExpr(self, blame_loc):
|
| 1352 | # type: (loc_t) -> None
|
| 1353 | """
|
| 1354 | A more specific fallback location, like the $[ in
|
| 1355 |
|
| 1356 | echo $[len(42)]
|
| 1357 | """
|
| 1358 | self.loc_for_expr = blame_loc
|
| 1359 |
|
| 1360 | def GetFallbackLocation(self):
|
| 1361 | # type: () -> loc_t
|
| 1362 |
|
| 1363 | if self.loc_for_expr != loc.Missing: # more specific
|
| 1364 | return self.loc_for_expr
|
| 1365 |
|
| 1366 | if self.token_for_line: # less specific
|
| 1367 | return self.token_for_line
|
| 1368 |
|
| 1369 | return loc.Missing
|
| 1370 |
|
| 1371 | #
|
| 1372 | # Status Variable Stack (for isolating $PS1 and $PS4)
|
| 1373 | #
|
| 1374 |
|
| 1375 | def LastStatus(self):
|
| 1376 | # type: () -> int
|
| 1377 | return self.last_status[-1]
|
| 1378 |
|
| 1379 | def TryStatus(self):
|
| 1380 | # type: () -> int
|
| 1381 | return self.try_status[-1]
|
| 1382 |
|
| 1383 | def TryError(self):
|
| 1384 | # type: () -> value.Dict
|
| 1385 | return self.try_error[-1]
|
| 1386 |
|
| 1387 | def PipeStatus(self):
|
| 1388 | # type: () -> List[int]
|
| 1389 | return self.pipe_status[-1]
|
| 1390 |
|
| 1391 | def SetLastStatus(self, x):
|
| 1392 | # type: (int) -> None
|
| 1393 | self.last_status[-1] = x
|
| 1394 |
|
| 1395 | def SetTryStatus(self, x):
|
| 1396 | # type: (int) -> None
|
| 1397 | self.try_status[-1] = x
|
| 1398 |
|
| 1399 | def SetTryError(self, x):
|
| 1400 | # type: (value.Dict) -> None
|
| 1401 | self.try_error[-1] = x
|
| 1402 |
|
| 1403 | def SetPipeStatus(self, x):
|
| 1404 | # type: (List[int]) -> None
|
| 1405 | self.pipe_status[-1] = x
|
| 1406 |
|
| 1407 | def SetSimplePipeStatus(self, status):
|
| 1408 | # type: (int) -> None
|
| 1409 |
|
| 1410 | # Optimization to avoid allocations
|
| 1411 | top = self.pipe_status[-1]
|
| 1412 | if len(top) == 1:
|
| 1413 | top[0] = status
|
| 1414 | else:
|
| 1415 | self.pipe_status[-1] = [status]
|
| 1416 |
|
| 1417 | def SetProcessSubStatus(self, x):
|
| 1418 | # type: (List[int]) -> None
|
| 1419 | self.process_sub_status[-1] = x
|
| 1420 |
|
| 1421 | #
|
| 1422 | # Call Stack
|
| 1423 | #
|
| 1424 |
|
| 1425 | def PushCall(self, func_name, def_tok):
|
| 1426 | # type: (str, Token) -> None
|
| 1427 | """Push argv, var, and debug stack frames.
|
| 1428 |
|
| 1429 | Currently used for proc and func calls. TODO: New func evaluator may
|
| 1430 | not use it.
|
| 1431 |
|
| 1432 | Args:
|
| 1433 | def_tok: Token where proc or func was defined, used to compute
|
| 1434 | BASH_SOURCE.
|
| 1435 | """
|
| 1436 | # self.token_for_line can be None?
|
| 1437 | self.debug_stack.append(
|
| 1438 | debug_frame.Call(self.token_for_line, def_tok, func_name))
|
| 1439 |
|
| 1440 | def PopCall(self):
|
| 1441 | # type: () -> None
|
| 1442 | """
|
| 1443 | Args:
|
| 1444 | should_pop_argv_stack: Pass False if PushCall was given None for argv
|
| 1445 | True for proc, False for func
|
| 1446 | """
|
| 1447 | self.debug_stack.pop()
|
| 1448 |
|
| 1449 | def ShouldRunDebugTrap(self):
|
| 1450 | # type: () -> bool
|
| 1451 |
|
| 1452 | # TODO: RunLastPart of pipeline can disable this
|
| 1453 |
|
| 1454 | # Don't recursively run DEBUG trap
|
| 1455 | if self.running_debug_trap:
|
| 1456 | return False
|
| 1457 |
|
| 1458 | # Don't run it inside functions
|
| 1459 | if len(self.var_stack) > 1:
|
| 1460 | return False
|
| 1461 |
|
| 1462 | return True
|
| 1463 |
|
| 1464 | def IsGlobalScope(self):
|
| 1465 | # type: () -> bool
|
| 1466 | """
|
| 1467 | local -g uses this, probably because bash does the wrong thing and
|
| 1468 | prints LOCALS, not globals.
|
| 1469 | """
|
| 1470 | return len(self.var_stack) == 1
|
| 1471 |
|
| 1472 | def InsideFunction(self):
|
| 1473 | # type: () -> bool
|
| 1474 | """For the ERR trap, and use builtin"""
|
| 1475 |
|
| 1476 | # TODO: Should this be unified with ParsingChangesAllowed()? Slightly
|
| 1477 | # different logic.
|
| 1478 |
|
| 1479 | # Don't run it inside functions
|
| 1480 | return len(self.var_stack) > 1
|
| 1481 |
|
| 1482 | def GlobalFrame(self):
|
| 1483 | # type: () -> Dict[str, Cell]
|
| 1484 | """For defining the global scope of modules.
|
| 1485 |
|
| 1486 | It's affected by ctx_ModuleEval()
|
| 1487 | """
|
| 1488 | return self.var_stack[0]
|
| 1489 |
|
| 1490 | def CurrentFrame(self):
|
| 1491 | # type: () -> Dict[str, Cell]
|
| 1492 | """For attaching a stack frame to a value.Block"""
|
| 1493 | return self.var_stack[-1]
|
| 1494 |
|
| 1495 | def PushSource(self, source_name, argv):
|
| 1496 | # type: (str, List[str]) -> None
|
| 1497 | """ For 'source foo.sh 1 2 3' """
|
| 1498 | if len(argv):
|
| 1499 | self.argv_stack.append(_ArgFrame(argv))
|
| 1500 |
|
| 1501 | # self.token_for_line can be None?
|
| 1502 | self.debug_stack.append(
|
| 1503 | debug_frame.Source(self.token_for_line, source_name))
|
| 1504 |
|
| 1505 | def PopSource(self, argv):
|
| 1506 | # type: (List[str]) -> None
|
| 1507 | self.debug_stack.pop()
|
| 1508 |
|
| 1509 | if len(argv):
|
| 1510 | self.argv_stack.pop()
|
| 1511 |
|
| 1512 | def PushTemp(self):
|
| 1513 | # type: () -> None
|
| 1514 | """For the temporary scope in 'FOO=bar BAR=baz echo'.
|
| 1515 |
|
| 1516 | Also for PS4 evaluation with more variables.
|
| 1517 | """
|
| 1518 | # We don't want the 'read' builtin to write to this frame!
|
| 1519 | frame = NewDict() # type: Dict[str, Cell]
|
| 1520 | self.var_stack.append(frame)
|
| 1521 |
|
| 1522 | def PopTemp(self):
|
| 1523 | # type: () -> None
|
| 1524 | self.var_stack.pop()
|
| 1525 |
|
| 1526 | def _BindEnvObj(self):
|
| 1527 | # type: () -> None
|
| 1528 | self.SetNamed(location.LName('ENV'), self.env_object,
|
| 1529 | scope_e.GlobalOnly)
|
| 1530 |
|
| 1531 | def MaybeInitEnvDict(self, environ):
|
| 1532 | # type: (Dict[str, str]) -> None
|
| 1533 | if self.did_ysh_env:
|
| 1534 | return
|
| 1535 |
|
| 1536 | for name, s in iteritems(environ):
|
| 1537 | self.env_dict[name] = value.Str(s)
|
| 1538 |
|
| 1539 | self._BindEnvObj()
|
| 1540 | self.did_ysh_env = True
|
| 1541 |
|
| 1542 | def PushEnvObj(self, bindings):
|
| 1543 | # type: (Dict[str, value_t]) -> None
|
| 1544 | """Push "bindings" as the MOST visible part of the ENV Obj
|
| 1545 |
|
| 1546 | i.e. first() / propView()
|
| 1547 | """
|
| 1548 | self.env_object = Obj(self.env_object, bindings)
|
| 1549 | self._BindEnvObj()
|
| 1550 |
|
| 1551 | def PopEnvObj(self):
|
| 1552 | # type: () -> None
|
| 1553 | """Pop a Dict of bindings."""
|
| 1554 | self.env_object = self.env_object.prototype
|
| 1555 | if self.env_object is None:
|
| 1556 | # TODO: Better error, or users shouldn't be able to mutate it
|
| 1557 | e_die('PopEnvObj: ENV.prototype is null', loc.Missing)
|
| 1558 |
|
| 1559 | self._BindEnvObj()
|
| 1560 |
|
| 1561 | #
|
| 1562 | # Argv
|
| 1563 | #
|
| 1564 |
|
| 1565 | def Shift(self, n):
|
| 1566 | # type: (int) -> int
|
| 1567 | frame = self.argv_stack[-1]
|
| 1568 | num_args = len(frame.argv)
|
| 1569 |
|
| 1570 | if (frame.num_shifted + n) <= num_args:
|
| 1571 | frame.num_shifted += n
|
| 1572 | return 0 # success
|
| 1573 | else:
|
| 1574 | return 1 # silent error
|
| 1575 |
|
| 1576 | def GetArg0(self):
|
| 1577 | # type: () -> value.Str
|
| 1578 | """Like GetArgNum(0) but with a more specific type."""
|
| 1579 | return value.Str(self.dollar0)
|
| 1580 |
|
| 1581 | def GetArgNum(self, arg_num):
|
| 1582 | # type: (int) -> value_t
|
| 1583 | if arg_num == 0:
|
| 1584 | # Disabled
|
| 1585 | if 0:
|
| 1586 | # Problem: Doesn't obey enclosing frame?
|
| 1587 | # Yeah it needs FrameLookup
|
| 1588 | cell, _ = _FrameLookup(self.var_stack[-1], '0')
|
| 1589 | if cell is not None:
|
| 1590 | val = cell.val
|
| 1591 | if val.tag() != value_e.Undef:
|
| 1592 | return val
|
| 1593 |
|
| 1594 | return value.Str(self.dollar0)
|
| 1595 |
|
| 1596 | return self.argv_stack[-1].GetArgNum(arg_num)
|
| 1597 |
|
| 1598 | def GetArgv(self):
|
| 1599 | # type: () -> List[str]
|
| 1600 | """For $* and $@."""
|
| 1601 | return self.argv_stack[-1].GetArgv()
|
| 1602 |
|
| 1603 | def SetArgv(self, argv):
|
| 1604 | # type: (List[str]) -> None
|
| 1605 | """For set -- 1 2 3."""
|
| 1606 | # from set -- 1 2 3
|
| 1607 | self.argv_stack[-1].SetArgv(argv)
|
| 1608 |
|
| 1609 | #
|
| 1610 | # Special Vars
|
| 1611 | #
|
| 1612 |
|
| 1613 | def GetSpecialVar(self, op_id):
|
| 1614 | # type: (int) -> value_t
|
| 1615 | if op_id == Id.VSub_Bang: # $!
|
| 1616 | n = self.last_bg_pid
|
| 1617 | if n == -1:
|
| 1618 | return value.Undef # could be an error
|
| 1619 |
|
| 1620 | elif op_id == Id.VSub_QMark: # $?
|
| 1621 | # External commands need WIFEXITED test. What about subshells?
|
| 1622 | n = self.last_status[-1]
|
| 1623 |
|
| 1624 | elif op_id == Id.VSub_Pound: # $#
|
| 1625 | n = self.argv_stack[-1].GetNumArgs()
|
| 1626 |
|
| 1627 | elif op_id == Id.VSub_Dollar: # $$
|
| 1628 | n = self.root_pid
|
| 1629 |
|
| 1630 | else:
|
| 1631 | raise NotImplementedError(op_id)
|
| 1632 |
|
| 1633 | return value.Str(str(n))
|
| 1634 |
|
| 1635 | #
|
| 1636 | # Named Vars
|
| 1637 | #
|
| 1638 |
|
| 1639 | def _ResolveNameOnly(self, name, which_scopes):
|
| 1640 | # type: (str, scope_t) -> Tuple[Optional[Cell], Dict[str, Cell]]
|
| 1641 | """Helper for getting and setting variable.
|
| 1642 |
|
| 1643 | Returns:
|
| 1644 | cell: The cell corresponding to looking up 'name' with the given mode, or
|
| 1645 | None if it's not found.
|
| 1646 | var_frame: The frame it should be set to or deleted from.
|
| 1647 | """
|
| 1648 | if which_scopes == scope_e.Dynamic:
|
| 1649 | for i in xrange(len(self.var_stack) - 1, -1, -1):
|
| 1650 | var_frame = self.var_stack[i]
|
| 1651 | cell, result_frame = _FrameLookup(var_frame, name)
|
| 1652 | if cell:
|
| 1653 | return cell, result_frame
|
| 1654 | return None, self.var_stack[0] # set in global var_frame
|
| 1655 |
|
| 1656 | if which_scopes == scope_e.LocalOnly:
|
| 1657 | var_frame = self.var_stack[-1]
|
| 1658 | cell, result_frame = _FrameLookup(var_frame, name)
|
| 1659 | if cell:
|
| 1660 | return cell, result_frame
|
| 1661 | return None, var_frame
|
| 1662 |
|
| 1663 | if which_scopes == scope_e.GlobalOnly:
|
| 1664 | var_frame = self.var_stack[0]
|
| 1665 | cell, result_frame = _FrameLookup(var_frame, name)
|
| 1666 | if cell:
|
| 1667 | return cell, result_frame
|
| 1668 |
|
| 1669 | return None, var_frame
|
| 1670 |
|
| 1671 | if which_scopes == scope_e.LocalOrGlobal:
|
| 1672 | # Local
|
| 1673 | var_frame = self.var_stack[-1]
|
| 1674 | cell, result_frame = _FrameLookup(var_frame, name)
|
| 1675 | if cell:
|
| 1676 | return cell, result_frame
|
| 1677 |
|
| 1678 | # Global
|
| 1679 | var_frame = self.var_stack[0]
|
| 1680 | cell, result_frame = _FrameLookup(var_frame, name)
|
| 1681 | if cell:
|
| 1682 | return cell, result_frame
|
| 1683 |
|
| 1684 | return None, var_frame
|
| 1685 |
|
| 1686 | raise AssertionError()
|
| 1687 |
|
| 1688 | def _ResolveNameOrRef(
|
| 1689 | self,
|
| 1690 | name, # type: str
|
| 1691 | which_scopes, # type: scope_t
|
| 1692 | ref_trail=None, # type: Optional[List[str]]
|
| 1693 | ):
|
| 1694 | # type: (...) -> Tuple[Optional[Cell], Dict[str, Cell], str]
|
| 1695 | """Look up a cell and namespace, but respect the nameref flag.
|
| 1696 |
|
| 1697 | Resolving namerefs does RECURSIVE calls.
|
| 1698 | """
|
| 1699 | cell, var_frame = self._ResolveNameOnly(name, which_scopes)
|
| 1700 |
|
| 1701 | if cell is None or not cell.nameref:
|
| 1702 | return cell, var_frame, name # not a nameref
|
| 1703 |
|
| 1704 | val = cell.val
|
| 1705 | UP_val = val
|
| 1706 | with tagswitch(val) as case:
|
| 1707 | if case(value_e.Undef):
|
| 1708 | # This is 'local -n undef_ref', which is kind of useless, because the
|
| 1709 | # more common idiom is 'local -n ref=$1'. Note that you can mutate
|
| 1710 | # references themselves with local -n ref=new.
|
| 1711 | if self.exec_opts.strict_nameref():
|
| 1712 | e_die('nameref %r is undefined' % name)
|
| 1713 | else:
|
| 1714 | return cell, var_frame, name # fallback
|
| 1715 |
|
| 1716 | elif case(value_e.Str):
|
| 1717 | val = cast(value.Str, UP_val)
|
| 1718 | new_name = val.s
|
| 1719 |
|
| 1720 | else:
|
| 1721 | # SetValue() protects the invariant that nameref is Undef or Str
|
| 1722 | raise AssertionError(val.tag())
|
| 1723 |
|
| 1724 | # TODO: Respect eval_unsafe_arith here (issue 881). See how it's done in
|
| 1725 | # 'printf -v' with MakeArithParser
|
| 1726 | if not match.IsValidVarName(new_name):
|
| 1727 | # e.g. '#' or '1' or ''
|
| 1728 | if self.exec_opts.strict_nameref():
|
| 1729 | e_die('nameref %r contains invalid variable name %r' %
|
| 1730 | (name, new_name))
|
| 1731 | else:
|
| 1732 | # Bash has this odd behavior of clearing the nameref bit when
|
| 1733 | # ref=#invalid#. strict_nameref avoids it.
|
| 1734 | cell.nameref = False
|
| 1735 | return cell, var_frame, name # fallback
|
| 1736 |
|
| 1737 | # Check for circular namerefs.
|
| 1738 | if ref_trail is None:
|
| 1739 | ref_trail = [name]
|
| 1740 | else:
|
| 1741 | if new_name in ref_trail:
|
| 1742 | e_die('Circular nameref %s' % ' -> '.join(ref_trail))
|
| 1743 | ref_trail.append(new_name)
|
| 1744 |
|
| 1745 | # 'declare -n' uses dynamic scope.
|
| 1746 | cell, var_frame, cell_name = self._ResolveNameOrRef(
|
| 1747 | new_name, scope_e.Dynamic, ref_trail=ref_trail)
|
| 1748 | return cell, var_frame, cell_name
|
| 1749 |
|
| 1750 | def IsBashAssoc(self, name):
|
| 1751 | # type: (str) -> bool
|
| 1752 | """Returns whether a name resolve to a cell with an associative array.
|
| 1753 |
|
| 1754 | We need to know this to evaluate the index expression properly
|
| 1755 | -- should it be coerced to an integer or not?
|
| 1756 | """
|
| 1757 | cell, _, _ = self._ResolveNameOrRef(name, self.ScopesForReading())
|
| 1758 | # foo=([key]=value)
|
| 1759 | return cell is not None and cell.val.tag() == value_e.BashAssoc
|
| 1760 |
|
| 1761 | def SetPlace(self, place, val, blame_loc):
|
| 1762 | # type: (value.Place, value_t, loc_t) -> None
|
| 1763 |
|
| 1764 | yval = place.lval
|
| 1765 | UP_yval = yval
|
| 1766 | with tagswitch(yval) as case:
|
| 1767 | if case(y_lvalue_e.Local):
|
| 1768 | yval = cast(LeftName, UP_yval)
|
| 1769 |
|
| 1770 | if 0:
|
| 1771 | # Check that the frame is still alive
|
| 1772 | # Note: Disabled because it doesn't work with modules. the
|
| 1773 | # Place captures a frame in def-test.ysh, which we want to
|
| 1774 | # mutate while Dict is executing in the module_frame for
|
| 1775 | # def.ysh. See ctx_ModuleEval
|
| 1776 | found = False
|
| 1777 | for i in xrange(len(self.var_stack) - 1, -1, -1):
|
| 1778 | frame = self.var_stack[i]
|
| 1779 | if frame is place.frame:
|
| 1780 | found = True
|
| 1781 | #log('FOUND %s', found)
|
| 1782 | break
|
| 1783 | if not found:
|
| 1784 | e_die(
|
| 1785 | "Can't assign to place that's no longer on the call stack.",
|
| 1786 | blame_loc)
|
| 1787 |
|
| 1788 | frame = place.frame
|
| 1789 | cell = frame.get(yval.name)
|
| 1790 | if cell is None:
|
| 1791 | cell = Cell(False, False, False, val)
|
| 1792 | frame[yval.name] = cell
|
| 1793 | else:
|
| 1794 | cell.val = val
|
| 1795 |
|
| 1796 | elif case(y_lvalue_e.Container):
|
| 1797 | e_die('Container place not implemented', blame_loc)
|
| 1798 |
|
| 1799 | else:
|
| 1800 | raise AssertionError()
|
| 1801 |
|
| 1802 | def SetLocalName(self, lval, val):
|
| 1803 | # type: (LeftName, value_t) -> None
|
| 1804 | """
|
| 1805 | Set a name in the local scope - used for func/proc param binding, etc.
|
| 1806 | """
|
| 1807 |
|
| 1808 | # Equivalent to
|
| 1809 | # self._ResolveNameOnly(lval.name, scope_e.LocalOnly)
|
| 1810 | var_frame = self.var_stack[-1]
|
| 1811 | cell = var_frame.get(lval.name)
|
| 1812 |
|
| 1813 | if cell:
|
| 1814 | if cell.readonly:
|
| 1815 | e_die("Can't assign to readonly value %r" % lval.name,
|
| 1816 | lval.blame_loc)
|
| 1817 | cell.val = val # Mutate value_t
|
| 1818 | else:
|
| 1819 | cell = Cell(False, False, False, val)
|
| 1820 | var_frame[lval.name] = cell
|
| 1821 |
|
| 1822 | def SetNamed(self, lval, val, which_scopes, flags=0):
|
| 1823 | # type: (LeftName, value_t, scope_t, int) -> None
|
| 1824 | if flags & SetNameref or flags & ClearNameref:
|
| 1825 | # declare -n ref=x # refers to the ref itself
|
| 1826 | cell, var_frame = self._ResolveNameOnly(lval.name, which_scopes)
|
| 1827 | cell_name = lval.name
|
| 1828 | else:
|
| 1829 | # ref=x # mutates THROUGH the reference
|
| 1830 |
|
| 1831 | # Note on how to implement declare -n ref='a[42]'
|
| 1832 | # 1. Call _ResolveNameOnly()
|
| 1833 | # 2. If cell.nameref, call self.unsafe_arith.ParseVarRef() ->
|
| 1834 | # BracedVarSub
|
| 1835 | # 3. Turn BracedVarSub into an sh_lvalue, and call
|
| 1836 | # self.unsafe_arith.SetValue() wrapper with ref_trail
|
| 1837 | cell, var_frame, cell_name = self._ResolveNameOrRef(
|
| 1838 | lval.name, which_scopes)
|
| 1839 |
|
| 1840 | if cell:
|
| 1841 | # Clear before checking readonly bit.
|
| 1842 | # NOTE: Could be cell.flags &= flag_clear_mask
|
| 1843 | if flags & ClearExport:
|
| 1844 | cell.exported = False
|
| 1845 | if flags & ClearReadOnly:
|
| 1846 | cell.readonly = False
|
| 1847 | if flags & ClearNameref:
|
| 1848 | cell.nameref = False
|
| 1849 |
|
| 1850 | if val is not None: # e.g. declare -rx existing
|
| 1851 | # Note: this DYNAMIC check means we can't have 'const' in a loop.
|
| 1852 | # But that's true for 'readonly' too, and hoisting it makes more
|
| 1853 | # sense anyway.
|
| 1854 | if cell.readonly:
|
| 1855 | e_die("Can't assign to readonly value %r" % lval.name,
|
| 1856 | lval.blame_loc)
|
| 1857 | cell.val = val # CHANGE VAL
|
| 1858 |
|
| 1859 | # NOTE: Could be cell.flags |= flag_set_mask
|
| 1860 | if flags & SetExport:
|
| 1861 | cell.exported = True
|
| 1862 | if flags & SetReadOnly:
|
| 1863 | cell.readonly = True
|
| 1864 | if flags & SetNameref:
|
| 1865 | cell.nameref = True
|
| 1866 |
|
| 1867 | else:
|
| 1868 | if val is None: # declare -rx nonexistent
|
| 1869 | # set -o nounset; local foo; echo $foo # It's still undefined!
|
| 1870 | val = value.Undef # export foo, readonly foo
|
| 1871 |
|
| 1872 | cell = Cell(bool(flags & SetExport), bool(flags & SetReadOnly),
|
| 1873 | bool(flags & SetNameref), val)
|
| 1874 | var_frame[cell_name] = cell
|
| 1875 |
|
| 1876 | # Maintain invariant that only strings and undefined cells can be
|
| 1877 | # exported.
|
| 1878 | assert cell.val is not None, cell
|
| 1879 |
|
| 1880 | if cell.val.tag() not in (value_e.Undef, value_e.Str):
|
| 1881 | if cell.exported:
|
| 1882 | if self.exec_opts.strict_array():
|
| 1883 | e_die("Only strings can be exported (strict_array)",
|
| 1884 | lval.blame_loc)
|
| 1885 | if cell.nameref:
|
| 1886 | e_die("nameref must be a string", lval.blame_loc)
|
| 1887 |
|
| 1888 | def SetValue(self, lval, val, which_scopes, flags=0):
|
| 1889 | # type: (sh_lvalue_t, value_t, scope_t, int) -> None
|
| 1890 | """
|
| 1891 | Args:
|
| 1892 | lval: sh_lvalue
|
| 1893 | val: value, or None if only changing flags
|
| 1894 | which_scopes:
|
| 1895 | Local | Global | Dynamic - for builtins, PWD, etc.
|
| 1896 | flags: packed pair (keyword_id, bit mask of set/clear flags)
|
| 1897 |
|
| 1898 | Note: in bash, PWD=/ changes the directory. But not in dash.
|
| 1899 | """
|
| 1900 | # STRICTNESS / SANENESS:
|
| 1901 | #
|
| 1902 | # 1) Don't create arrays automatically, e.g. a[1000]=x
|
| 1903 | # 2) Never change types? yeah I think that's a good idea, at least for YSH
|
| 1904 | # (not sh, for compatibility). set -o strict_types or something. That
|
| 1905 | # means arrays have to be initialized with let arr = [], which is fine.
|
| 1906 | # This helps with stuff like IFS. It starts off as a string, and assigning
|
| 1907 | # it to a list is an error. I guess you will have to turn this no for
|
| 1908 | # bash?
|
| 1909 | #
|
| 1910 | # TODO:
|
| 1911 | # - COMPUTED vars can't be set
|
| 1912 | # - What about PWD / OLDPWD / UID / EUID ? You can simply make them
|
| 1913 | # readonly.
|
| 1914 | # - Maybe PARSE $PS1 and $PS4 when they're set, to avoid the error on use?
|
| 1915 | # - Other validity: $HOME could be checked for existence
|
| 1916 |
|
| 1917 | UP_lval = lval
|
| 1918 | with tagswitch(lval) as case:
|
| 1919 | if case(sh_lvalue_e.Var):
|
| 1920 | lval = cast(LeftName, UP_lval)
|
| 1921 |
|
| 1922 | self.SetNamed(lval, val, which_scopes, flags=flags)
|
| 1923 |
|
| 1924 | elif case(sh_lvalue_e.Indexed):
|
| 1925 | lval = cast(sh_lvalue.Indexed, UP_lval)
|
| 1926 |
|
| 1927 | # There is no syntax 'declare a[x]'
|
| 1928 | assert val is not None, val
|
| 1929 |
|
| 1930 | # TODO: relax this for YSH
|
| 1931 | assert val.tag() == value_e.Str, val
|
| 1932 | rval = cast(value.Str, val)
|
| 1933 |
|
| 1934 | # Note: location could be a[x]=1 or (( a[ x ] = 1 ))
|
| 1935 | left_loc = lval.blame_loc
|
| 1936 |
|
| 1937 | # bash/mksh have annoying behavior of letting you do LHS assignment to
|
| 1938 | # Undef, which then turns into an INDEXED array. (Undef means that set
|
| 1939 | # -o nounset fails.)
|
| 1940 | cell, var_frame, _ = self._ResolveNameOrRef(
|
| 1941 | lval.name, which_scopes)
|
| 1942 | if not cell:
|
| 1943 | self._BindNewArrayWithEntry(var_frame, lval, rval, flags)
|
| 1944 | return
|
| 1945 |
|
| 1946 | if cell.readonly:
|
| 1947 | e_die("Can't assign to readonly array", left_loc)
|
| 1948 |
|
| 1949 | UP_cell_val = cell.val
|
| 1950 | # undef[0]=y is allowed
|
| 1951 | with tagswitch(UP_cell_val) as case2:
|
| 1952 | if case2(value_e.Undef):
|
| 1953 | self._BindNewArrayWithEntry(var_frame, lval, rval,
|
| 1954 | flags)
|
| 1955 | return
|
| 1956 |
|
| 1957 | elif case2(value_e.Str):
|
| 1958 | # s=x
|
| 1959 | # s[1]=y # invalid
|
| 1960 | e_die("Can't assign to items in a string", left_loc)
|
| 1961 |
|
| 1962 | elif case2(value_e.BashArray):
|
| 1963 | cell_val = cast(value.BashArray, UP_cell_val)
|
| 1964 | strs = cell_val.strs
|
| 1965 |
|
| 1966 | n = len(strs)
|
| 1967 | index = lval.index
|
| 1968 | if index < 0: # a[-1]++ computes this twice; could we avoid it?
|
| 1969 | index += n
|
| 1970 |
|
| 1971 | if 0 <= index and index < n:
|
| 1972 | strs[index] = rval.s
|
| 1973 | else:
|
| 1974 | # Fill it in with None. It could look like this:
|
| 1975 | # ['1', 2, 3, None, None, '4', None]
|
| 1976 | # Then ${#a[@]} counts the entries that are not None.
|
| 1977 | n = index - len(strs) + 1
|
| 1978 | for i in xrange(n):
|
| 1979 | strs.append(None)
|
| 1980 | strs[lval.index] = rval.s
|
| 1981 | return
|
| 1982 |
|
| 1983 | # This could be an object, eggex object, etc. It won't be
|
| 1984 | # BashAssoc shouldn because we query IsBashAssoc before evaluating
|
| 1985 | # sh_lhs. Could conslidate with s[i] case above
|
| 1986 | e_die(
|
| 1987 | "Value of type %s can't be indexed" % ui.ValType(cell.val),
|
| 1988 | left_loc)
|
| 1989 |
|
| 1990 | elif case(sh_lvalue_e.Keyed):
|
| 1991 | lval = cast(sh_lvalue.Keyed, UP_lval)
|
| 1992 |
|
| 1993 | # There is no syntax 'declare A["x"]'
|
| 1994 | assert val is not None, val
|
| 1995 | assert val.tag() == value_e.Str, val
|
| 1996 | rval = cast(value.Str, val)
|
| 1997 |
|
| 1998 | left_loc = lval.blame_loc
|
| 1999 |
|
| 2000 | cell, var_frame, _ = self._ResolveNameOrRef(
|
| 2001 | lval.name, which_scopes)
|
| 2002 | if cell.readonly:
|
| 2003 | e_die("Can't assign to readonly associative array",
|
| 2004 | left_loc)
|
| 2005 |
|
| 2006 | # We already looked it up before making the sh_lvalue
|
| 2007 | assert cell.val.tag() == value_e.BashAssoc, cell
|
| 2008 | cell_val2 = cast(value.BashAssoc, cell.val)
|
| 2009 |
|
| 2010 | cell_val2.d[lval.key] = rval.s
|
| 2011 |
|
| 2012 | else:
|
| 2013 | raise AssertionError(lval.tag())
|
| 2014 |
|
| 2015 | def _BindNewArrayWithEntry(self, var_frame, lval, val, flags):
|
| 2016 | # type: (Dict[str, Cell], sh_lvalue.Indexed, value.Str, int) -> None
|
| 2017 | """Fill 'var_frame' with a new indexed array entry."""
|
| 2018 | no_str = None # type: Optional[str]
|
| 2019 | items = [no_str] * lval.index
|
| 2020 | items.append(val.s)
|
| 2021 | new_value = value.BashArray(items)
|
| 2022 |
|
| 2023 | # arrays can't be exported; can't have BashAssoc flag
|
| 2024 | readonly = bool(flags & SetReadOnly)
|
| 2025 | var_frame[lval.name] = Cell(False, readonly, False, new_value)
|
| 2026 |
|
| 2027 | def InternalSetGlobal(self, name, new_val):
|
| 2028 | # type: (str, value_t) -> None
|
| 2029 | """For setting read-only globals internally.
|
| 2030 |
|
| 2031 | Args:
|
| 2032 | name: string (not Lhs)
|
| 2033 | new_val: value
|
| 2034 |
|
| 2035 | The variable must already exist.
|
| 2036 |
|
| 2037 | Use case: SHELLOPTS.
|
| 2038 | """
|
| 2039 | cell = self.var_stack[0][name]
|
| 2040 | cell.val = new_val
|
| 2041 |
|
| 2042 | def GetValue(self, name, which_scopes=scope_e.Shopt):
|
| 2043 | # type: (str, scope_t) -> value_t
|
| 2044 | """Used by the WordEvaluator, ArithEvaluator, ExprEvaluator, etc."""
|
| 2045 | assert isinstance(name, str), name
|
| 2046 |
|
| 2047 | if which_scopes == scope_e.Shopt:
|
| 2048 | which_scopes = self.ScopesForReading()
|
| 2049 |
|
| 2050 | with str_switch(name) as case:
|
| 2051 | # "Registers"
|
| 2052 | if case('_status'): # deprecated in favor of _error.code
|
| 2053 | return num.ToBig(self.TryStatus())
|
| 2054 |
|
| 2055 | elif case('_error'):
|
| 2056 | return self.TryError()
|
| 2057 |
|
| 2058 | elif case('_this_dir'):
|
| 2059 | if len(self.this_dir) == 0:
|
| 2060 | # e.g. osh -c '' doesn't have it set
|
| 2061 | # Should we give a custom error here?
|
| 2062 | # If you're at the interactive shell, 'source mymodule.ysh' will still
|
| 2063 | # work because 'source' sets it.
|
| 2064 | return value.Undef
|
| 2065 | else:
|
| 2066 | return value.Str(self.this_dir[-1]) # top of stack
|
| 2067 |
|
| 2068 | elif case('PIPESTATUS'):
|
| 2069 | strs2 = [str(i)
|
| 2070 | for i in self.pipe_status[-1]] # type: List[str]
|
| 2071 | return value.BashArray(strs2)
|
| 2072 |
|
| 2073 | elif case('_pipeline_status'):
|
| 2074 | items = [num.ToBig(i)
|
| 2075 | for i in self.pipe_status[-1]] # type: List[value_t]
|
| 2076 | return value.List(items)
|
| 2077 |
|
| 2078 | elif case('_process_sub_status'): # YSH naming convention
|
| 2079 | items = [num.ToBig(i) for i in self.process_sub_status[-1]]
|
| 2080 | return value.List(items)
|
| 2081 |
|
| 2082 | elif case('BASH_REMATCH'):
|
| 2083 | top_match = self.regex_match[-1]
|
| 2084 | with tagswitch(top_match) as case2:
|
| 2085 | if case2(regex_match_e.No):
|
| 2086 | groups = [] # type: List[str]
|
| 2087 | elif case2(regex_match_e.Yes):
|
| 2088 | m = cast(RegexMatch, top_match)
|
| 2089 | groups = util.RegexGroupStrings(m.s, m.indices)
|
| 2090 | return value.BashArray(groups)
|
| 2091 |
|
| 2092 | # Do lookup of system globals before looking at user variables. Note: we
|
| 2093 | # could optimize this at compile-time like $?. That would break
|
| 2094 | # ${!varref}, but it's already broken for $?.
|
| 2095 |
|
| 2096 | elif case('FUNCNAME'):
|
| 2097 | # bash wants it in reverse order. This is a little inefficient but we're
|
| 2098 | # not depending on deque().
|
| 2099 | strs = [] # type: List[str]
|
| 2100 | for frame in reversed(self.debug_stack):
|
| 2101 | UP_frame = frame
|
| 2102 | with tagswitch(frame) as case2:
|
| 2103 | if case2(debug_frame_e.Call):
|
| 2104 | frame = cast(debug_frame.Call, UP_frame)
|
| 2105 | strs.append(frame.func_name)
|
| 2106 |
|
| 2107 | elif case2(debug_frame_e.Source):
|
| 2108 | # bash doesn't tell you the filename sourced
|
| 2109 | strs.append('source')
|
| 2110 |
|
| 2111 | elif case2(debug_frame_e.Main):
|
| 2112 | strs.append('main') # also bash behavior
|
| 2113 |
|
| 2114 | return value.BashArray(strs) # TODO: Reuse this object too?
|
| 2115 |
|
| 2116 | # $BASH_SOURCE and $BASH_LINENO have OFF BY ONE design bugs:
|
| 2117 | #
|
| 2118 | # ${BASH_LINENO[$i]} is the line number in the source file
|
| 2119 | # (${BASH_SOURCE[$i+1]}) where ${FUNCNAME[$i]} was called (or
|
| 2120 | # ${BASH_LINENO[$i-1]} if referenced within another shell function).
|
| 2121 | #
|
| 2122 | # https://www.gnu.org/software/bash/manual/html_node/Bash-Variables.html
|
| 2123 |
|
| 2124 | elif case('BASH_SOURCE'):
|
| 2125 | strs = []
|
| 2126 | for frame in reversed(self.debug_stack):
|
| 2127 | UP_frame = frame
|
| 2128 | with tagswitch(frame) as case2:
|
| 2129 | if case2(debug_frame_e.Call):
|
| 2130 | frame = cast(debug_frame.Call, UP_frame)
|
| 2131 |
|
| 2132 | # Weird bash behavior
|
| 2133 | assert frame.def_tok.line is not None
|
| 2134 | source_str = ui.GetLineSourceString(
|
| 2135 | frame.def_tok.line)
|
| 2136 | strs.append(source_str)
|
| 2137 |
|
| 2138 | elif case2(debug_frame_e.Source):
|
| 2139 | frame = cast(debug_frame.Source, UP_frame)
|
| 2140 | # Is this right?
|
| 2141 | strs.append(frame.source_name)
|
| 2142 |
|
| 2143 | elif case2(debug_frame_e.Main):
|
| 2144 | frame = cast(debug_frame.Main, UP_frame)
|
| 2145 | strs.append(frame.dollar0)
|
| 2146 |
|
| 2147 | return value.BashArray(strs) # TODO: Reuse this object too?
|
| 2148 |
|
| 2149 | elif case('BASH_LINENO'):
|
| 2150 | strs = []
|
| 2151 | for frame in reversed(self.debug_stack):
|
| 2152 | UP_frame = frame
|
| 2153 | with tagswitch(frame) as case2:
|
| 2154 | if case2(debug_frame_e.Call):
|
| 2155 | frame = cast(debug_frame.Call, UP_frame)
|
| 2156 | strs.append(_LineNumber(frame.call_tok))
|
| 2157 |
|
| 2158 | elif case2(debug_frame_e.Source):
|
| 2159 | frame = cast(debug_frame.Source, UP_frame)
|
| 2160 | strs.append(_LineNumber(frame.call_tok))
|
| 2161 |
|
| 2162 | elif case2(debug_frame_e.Main):
|
| 2163 | # Bash does this to line up with 'main'
|
| 2164 | strs.append('0')
|
| 2165 |
|
| 2166 | return value.BashArray(strs) # TODO: Reuse this object too?
|
| 2167 |
|
| 2168 | elif case('LINENO'):
|
| 2169 | assert self.token_for_line is not None
|
| 2170 | # Reuse object with mutation
|
| 2171 | # TODO: maybe use interned GetLineNumStr?
|
| 2172 | self.line_num.s = str(self.token_for_line.line.line_num)
|
| 2173 | return self.line_num
|
| 2174 |
|
| 2175 | elif case('BASHPID'): # TODO: YSH io->getpid()
|
| 2176 | return value.Str(str(posix.getpid()))
|
| 2177 |
|
| 2178 | elif case('_'):
|
| 2179 | return value.Str(self.last_arg)
|
| 2180 |
|
| 2181 | elif case('SECONDS'):
|
| 2182 | f = time_.time() - self.seconds_start
|
| 2183 | ok, big_int = mops.FromFloat(f)
|
| 2184 | assert ok, f # should never be NAN or INFINITY
|
| 2185 | return value.Int(big_int)
|
| 2186 |
|
| 2187 | else:
|
| 2188 | # In the case 'declare -n ref='a[42]', the result won't be a cell. Idea to
|
| 2189 | # fix this:
|
| 2190 | # 1. Call self.unsafe_arith.ParseVarRef() -> BracedVarSub
|
| 2191 | # 2. Call self.unsafe_arith.GetNameref(bvs_part), and get a value_t
|
| 2192 | # We still need a ref_trail to detect cycles.
|
| 2193 | cell, _, _ = self._ResolveNameOrRef(name, which_scopes)
|
| 2194 | if cell:
|
| 2195 | return cell.val
|
| 2196 |
|
| 2197 | builtin_val = self.builtins.get(name)
|
| 2198 | if builtin_val:
|
| 2199 | return builtin_val
|
| 2200 |
|
| 2201 | # TODO: Can look in the builtins module, which is a value.Obj
|
| 2202 | return value.Undef
|
| 2203 |
|
| 2204 | def GetCell(self, name, which_scopes=scope_e.Shopt):
|
| 2205 | # type: (str, scope_t) -> Cell
|
| 2206 | """Get both the value and flags.
|
| 2207 |
|
| 2208 | Usages:
|
| 2209 | - the 'pp' builtin.
|
| 2210 | - declare -p
|
| 2211 | - ${x@a}
|
| 2212 | - to test of 'TZ' is exported in printf? Why?
|
| 2213 |
|
| 2214 | Note: consulting __builtins__ doesn't see necessary for any of these
|
| 2215 | """
|
| 2216 | if which_scopes == scope_e.Shopt:
|
| 2217 | which_scopes = self.ScopesForReading()
|
| 2218 |
|
| 2219 | cell, _ = self._ResolveNameOnly(name, which_scopes)
|
| 2220 | return cell
|
| 2221 |
|
| 2222 | def Unset(self, lval, which_scopes):
|
| 2223 | # type: (sh_lvalue_t, scope_t) -> bool
|
| 2224 | """
|
| 2225 | Returns:
|
| 2226 | Whether the cell was found.
|
| 2227 | """
|
| 2228 | # TODO: Refactor sh_lvalue type to avoid this
|
| 2229 | UP_lval = lval
|
| 2230 |
|
| 2231 | with tagswitch(lval) as case:
|
| 2232 | if case(sh_lvalue_e.Var): # unset x
|
| 2233 | lval = cast(LeftName, UP_lval)
|
| 2234 | var_name = lval.name
|
| 2235 | elif case(sh_lvalue_e.Indexed): # unset 'a[1]'
|
| 2236 | lval = cast(sh_lvalue.Indexed, UP_lval)
|
| 2237 | var_name = lval.name
|
| 2238 | elif case(sh_lvalue_e.Keyed): # unset 'A["K"]'
|
| 2239 | lval = cast(sh_lvalue.Keyed, UP_lval)
|
| 2240 | var_name = lval.name
|
| 2241 | else:
|
| 2242 | raise AssertionError()
|
| 2243 |
|
| 2244 | if which_scopes == scope_e.Shopt:
|
| 2245 | which_scopes = self.ScopesForWriting()
|
| 2246 |
|
| 2247 | cell, var_frame, cell_name = self._ResolveNameOrRef(
|
| 2248 | var_name, which_scopes)
|
| 2249 | if not cell:
|
| 2250 | return False # 'unset' builtin falls back on functions
|
| 2251 | if cell.readonly:
|
| 2252 | raise error.Runtime("Can't unset readonly variable %r" % var_name)
|
| 2253 |
|
| 2254 | with tagswitch(lval) as case:
|
| 2255 | if case(sh_lvalue_e.Var): # unset x
|
| 2256 | # Make variables in higher scopes visible.
|
| 2257 | # example: test/spec.sh builtin-vars -r 24 (ble.sh)
|
| 2258 | mylib.dict_erase(var_frame, cell_name)
|
| 2259 |
|
| 2260 | # alternative that some shells use:
|
| 2261 | # var_frame[cell_name].val = value.Undef
|
| 2262 | # cell.exported = False
|
| 2263 |
|
| 2264 | # This should never happen because we do recursive lookups of namerefs.
|
| 2265 | assert not cell.nameref, cell
|
| 2266 |
|
| 2267 | elif case(sh_lvalue_e.Indexed): # unset 'a[1]'
|
| 2268 | lval = cast(sh_lvalue.Indexed, UP_lval)
|
| 2269 | # Note: Setting an entry to None and shifting entries are pretty
|
| 2270 | # much the same in shell.
|
| 2271 |
|
| 2272 | val = cell.val
|
| 2273 | UP_val = val
|
| 2274 | if val.tag() != value_e.BashArray:
|
| 2275 | raise error.Runtime("%r isn't an array" % var_name)
|
| 2276 |
|
| 2277 | val = cast(value.BashArray, UP_val)
|
| 2278 | strs = val.strs
|
| 2279 |
|
| 2280 | n = len(strs)
|
| 2281 | last_index = n - 1
|
| 2282 | index = lval.index
|
| 2283 | if index < 0:
|
| 2284 | index += n
|
| 2285 |
|
| 2286 | if index == last_index:
|
| 2287 | # Special case: The array SHORTENS if you unset from the end. You
|
| 2288 | # can tell with a+=(3 4)
|
| 2289 | strs.pop()
|
| 2290 | elif 0 <= index and index < last_index:
|
| 2291 | strs[index] = None
|
| 2292 | else:
|
| 2293 | # If it's not found, it's not an error. In other words, 'unset'
|
| 2294 | # ensures that a value doesn't exist, regardless of whether it
|
| 2295 | # existed. It's idempotent.
|
| 2296 | # (Ousterhout specifically argues that the strict behavior was a
|
| 2297 | # mistake for Tcl!)
|
| 2298 | pass
|
| 2299 |
|
| 2300 | elif case(sh_lvalue_e.Keyed): # unset 'A["K"]'
|
| 2301 | lval = cast(sh_lvalue.Keyed, UP_lval)
|
| 2302 |
|
| 2303 | val = cell.val
|
| 2304 | UP_val = val
|
| 2305 |
|
| 2306 | # note: never happens because of mem.IsBashAssoc test for sh_lvalue.Keyed
|
| 2307 | #if val.tag() != value_e.BashAssoc:
|
| 2308 | # raise error.Runtime("%r isn't an associative array" % lval.name)
|
| 2309 |
|
| 2310 | val = cast(value.BashAssoc, UP_val)
|
| 2311 | mylib.dict_erase(val.d, lval.key)
|
| 2312 |
|
| 2313 | else:
|
| 2314 | raise AssertionError(lval)
|
| 2315 |
|
| 2316 | return True
|
| 2317 |
|
| 2318 | def ScopesForReading(self):
|
| 2319 | # type: () -> scope_t
|
| 2320 | """Read scope."""
|
| 2321 | return (scope_e.Dynamic
|
| 2322 | if self.exec_opts.dynamic_scope() else scope_e.LocalOrGlobal)
|
| 2323 |
|
| 2324 | def ScopesForWriting(self):
|
| 2325 | # type: () -> scope_t
|
| 2326 | """Write scope."""
|
| 2327 | return (scope_e.Dynamic
|
| 2328 | if self.exec_opts.dynamic_scope() else scope_e.LocalOnly)
|
| 2329 |
|
| 2330 | def ClearFlag(self, name, flag):
|
| 2331 | # type: (str, int) -> bool
|
| 2332 | """Used for export -n.
|
| 2333 |
|
| 2334 | We don't use SetValue() because even if rval is None, it will make an
|
| 2335 | Undef value in a scope.
|
| 2336 | """
|
| 2337 | cell, var_frame = self._ResolveNameOnly(name, self.ScopesForReading())
|
| 2338 | if cell:
|
| 2339 | if flag & ClearExport:
|
| 2340 | cell.exported = False
|
| 2341 | if flag & ClearNameref:
|
| 2342 | cell.nameref = False
|
| 2343 | return True
|
| 2344 | else:
|
| 2345 | return False
|
| 2346 |
|
| 2347 | def _FillWithExported(self, new_env):
|
| 2348 | # type: (Dict[str, str]) -> None
|
| 2349 |
|
| 2350 | # Search from globals up. Names higher on the stack will overwrite
|
| 2351 | # names lower on the stack.
|
| 2352 | for scope in self.var_stack:
|
| 2353 | for name, cell in iteritems(scope):
|
| 2354 | if cell.exported and cell.val.tag() == value_e.Str:
|
| 2355 | val = cast(value.Str, cell.val)
|
| 2356 | new_env[name] = val.s
|
| 2357 |
|
| 2358 | def _FillEnvObj(self, new_env, env_object):
|
| 2359 | # type: (Dict[str, str], Obj) -> None
|
| 2360 |
|
| 2361 | # Do the LEAST visible parts first
|
| 2362 | if env_object.prototype is not None:
|
| 2363 | self._FillEnvObj(new_env, env_object.prototype)
|
| 2364 |
|
| 2365 | # Overwrite with MOST visible parts
|
| 2366 | for name, val in iteritems(env_object.d):
|
| 2367 | if val.tag() != value_e.Str:
|
| 2368 | continue
|
| 2369 | new_env[name] = cast(value.Str, val).s
|
| 2370 |
|
| 2371 | def GetEnv(self):
|
| 2372 | # type: () -> Dict[str, str]
|
| 2373 | """
|
| 2374 | Get the environment that should be used for launching processes.
|
| 2375 |
|
| 2376 | Note: This is run on every SimpleCommand. Should we have a dirty
|
| 2377 | flag? We could notice these things:
|
| 2378 |
|
| 2379 | - If an exported variable is changed
|
| 2380 | - If the set of exported variables changes.
|
| 2381 | """
|
| 2382 | new_env = {} # type: Dict[str, str]
|
| 2383 |
|
| 2384 | # Note: ysh:upgrade has both of these behaviors
|
| 2385 |
|
| 2386 | # OSH: Consult exported vars
|
| 2387 | if not self.exec_opts.no_exported():
|
| 2388 | self._FillWithExported(new_env)
|
| 2389 |
|
| 2390 | # YSH: Consult the ENV dict
|
| 2391 | if self.exec_opts.env_obj():
|
| 2392 | self._FillEnvObj(new_env, self.env_object)
|
| 2393 |
|
| 2394 | return new_env
|
| 2395 |
|
| 2396 | def VarNames(self):
|
| 2397 | # type: () -> List[str]
|
| 2398 | """For internal OSH completion and compgen -A variable.
|
| 2399 |
|
| 2400 | NOTE: We could also add $? $$ etc.?
|
| 2401 | """
|
| 2402 | ret = [] # type: List[str]
|
| 2403 | # Look up the stack, yielding all variables. Bash seems to do this.
|
| 2404 | for scope in self.var_stack:
|
| 2405 | for name in scope:
|
| 2406 | ret.append(name)
|
| 2407 | return ret
|
| 2408 |
|
| 2409 | def VarNamesStartingWith(self, prefix):
|
| 2410 | # type: (str) -> List[str]
|
| 2411 | """For ${!prefix@}"""
|
| 2412 | # Look up the stack, yielding all variables. Bash seems to do this.
|
| 2413 | names = [] # type: List[str]
|
| 2414 | for scope in self.var_stack:
|
| 2415 | for name in scope:
|
| 2416 | if name.startswith(prefix):
|
| 2417 | names.append(name)
|
| 2418 | return names
|
| 2419 |
|
| 2420 | def GetAllVars(self):
|
| 2421 | # type: () -> Dict[str, str]
|
| 2422 | """Get all variables and their values, for 'set' builtin."""
|
| 2423 | result = {} # type: Dict[str, str]
|
| 2424 | for scope in self.var_stack:
|
| 2425 | for name, cell in iteritems(scope):
|
| 2426 | # TODO: Show other types?
|
| 2427 | val = cell.val
|
| 2428 | if val.tag() == value_e.Str:
|
| 2429 | str_val = cast(value.Str, val)
|
| 2430 | result[name] = str_val.s
|
| 2431 | return result
|
| 2432 |
|
| 2433 | def GetAllCells(self, which_scopes):
|
| 2434 | # type: (scope_t) -> Dict[str, Cell]
|
| 2435 | """Get all variables and their values, for 'set' builtin."""
|
| 2436 | result = {} # type: Dict[str, Cell]
|
| 2437 |
|
| 2438 | if which_scopes == scope_e.Dynamic:
|
| 2439 | scopes = self.var_stack
|
| 2440 | elif which_scopes == scope_e.LocalOnly:
|
| 2441 | scopes = self.var_stack[-1:]
|
| 2442 | elif which_scopes == scope_e.GlobalOnly:
|
| 2443 | scopes = self.var_stack[0:1]
|
| 2444 | elif which_scopes == scope_e.LocalOrGlobal:
|
| 2445 | scopes = [self.var_stack[0]]
|
| 2446 | if len(self.var_stack) > 1:
|
| 2447 | scopes.append(self.var_stack[-1])
|
| 2448 | else:
|
| 2449 | raise AssertionError()
|
| 2450 |
|
| 2451 | for scope in scopes:
|
| 2452 | for name, cell in iteritems(scope):
|
| 2453 | result[name] = cell
|
| 2454 | return result
|
| 2455 |
|
| 2456 | def SetRegexMatch(self, match):
|
| 2457 | # type: (regex_match_t) -> None
|
| 2458 | self.regex_match[-1] = match
|
| 2459 |
|
| 2460 | def GetRegexMatch(self):
|
| 2461 | # type: () -> regex_match_t
|
| 2462 | return self.regex_match[-1]
|
| 2463 |
|
| 2464 | def PushContextStack(self, context):
|
| 2465 | # type: (Dict[str, value_t]) -> None
|
| 2466 | self.ctx_stack.append(context)
|
| 2467 |
|
| 2468 | def GetContext(self):
|
| 2469 | # type: () -> Optional[Dict[str, value_t]]
|
| 2470 | if len(self.ctx_stack):
|
| 2471 | return self.ctx_stack[-1]
|
| 2472 | return None
|
| 2473 |
|
| 2474 | def PopContextStack(self):
|
| 2475 | # type: () -> Dict[str, value_t]
|
| 2476 | assert self.ctx_stack, "Empty context stack"
|
| 2477 | return self.ctx_stack.pop()
|
| 2478 |
|
| 2479 |
|
| 2480 | def ValueIsInvokableObj(val):
|
| 2481 | # type: (value_t) -> Tuple[Optional[value_t], Optional[Obj]]
|
| 2482 | """
|
| 2483 | Returns:
|
| 2484 | (__invoke__ Proc or BuiltinProc, self Obj) if the value is invokable
|
| 2485 | (None, None) otherwise
|
| 2486 | """
|
| 2487 | if val.tag() != value_e.Obj:
|
| 2488 | return None, None
|
| 2489 |
|
| 2490 | obj = cast(Obj, val)
|
| 2491 | if not obj.prototype:
|
| 2492 | return None, None
|
| 2493 |
|
| 2494 | invoke_val = obj.prototype.d.get('__invoke__')
|
| 2495 | if invoke_val is None:
|
| 2496 | return None, None
|
| 2497 |
|
| 2498 | # TODO: __invoke__ of wrong type could be fatal error?
|
| 2499 | if invoke_val.tag() in (value_e.Proc, value_e.BuiltinProc):
|
| 2500 | return invoke_val, obj
|
| 2501 |
|
| 2502 | return None, None
|
| 2503 |
|
| 2504 |
|
| 2505 | def _AddNames(unique, frame):
|
| 2506 | # type: (Dict[str, bool], Dict[str, Cell]) -> None
|
| 2507 | for name in frame:
|
| 2508 | val = frame[name].val
|
| 2509 | if val.tag() == value_e.Proc:
|
| 2510 | unique[name] = True
|
| 2511 | proc, _ = ValueIsInvokableObj(val)
|
| 2512 | if proc is not None:
|
| 2513 | unique[name] = True
|
| 2514 |
|
| 2515 |
|
| 2516 | class Procs(object):
|
| 2517 | """
|
| 2518 | Terminology:
|
| 2519 |
|
| 2520 | - invokable - these are INTERIOR
|
| 2521 | - value.Proc - which can be shell function in __sh_funcs__ namespace, or
|
| 2522 | YSH proc
|
| 2523 | - value.Obj with __invoke__
|
| 2524 | - exterior - external commands, extern builtin
|
| 2525 |
|
| 2526 | Note: the YSH 'invoke' builtin can generalize YSH 'runproc' builtin, shell command/builtin,
|
| 2527 | and also type / type -a
|
| 2528 | """
|
| 2529 |
|
| 2530 | def __init__(self, mem):
|
| 2531 | # type: (Mem) -> None
|
| 2532 | self.mem = mem
|
| 2533 | self.sh_funcs = {} # type: Dict[str, value.Proc]
|
| 2534 |
|
| 2535 | def DefineShellFunc(self, name, proc):
|
| 2536 | # type: (str, value.Proc) -> None
|
| 2537 | self.sh_funcs[name] = proc
|
| 2538 |
|
| 2539 | def IsShellFunc(self, name):
|
| 2540 | # type: (str) -> bool
|
| 2541 | return name in self.sh_funcs
|
| 2542 |
|
| 2543 | def GetShellFunc(self, name):
|
| 2544 | # type: (str) -> Optional[value.Proc]
|
| 2545 | return self.sh_funcs.get(name)
|
| 2546 |
|
| 2547 | def EraseShellFunc(self, to_del):
|
| 2548 | # type: (str) -> None
|
| 2549 | """Undefine a sh-func with name `to_del`, if it exists."""
|
| 2550 | mylib.dict_erase(self.sh_funcs, to_del)
|
| 2551 |
|
| 2552 | def ShellFuncNames(self):
|
| 2553 | # type: () -> List[str]
|
| 2554 | """Returns a *sorted* list of all shell function names
|
| 2555 |
|
| 2556 | Callers:
|
| 2557 | declare -f -F
|
| 2558 | """
|
| 2559 | names = self.sh_funcs.keys()
|
| 2560 | names.sort()
|
| 2561 | return names
|
| 2562 |
|
| 2563 | def DefineProc(self, name, proc):
|
| 2564 | # type: (str, value.Proc) -> None
|
| 2565 | """
|
| 2566 | procs are defined in the local scope.
|
| 2567 | """
|
| 2568 | self.mem.var_stack[-1][name] = Cell(False, False, False, proc)
|
| 2569 |
|
| 2570 | def IsProc(self, name):
|
| 2571 | # type: (str) -> bool
|
| 2572 |
|
| 2573 | maybe_proc = self.mem.GetValue(name)
|
| 2574 | # Could be Undef
|
| 2575 | return maybe_proc.tag() == value_e.Proc
|
| 2576 |
|
| 2577 | def IsInvokableObj(self, name):
|
| 2578 | # type: (str) -> bool
|
| 2579 |
|
| 2580 | val = self.mem.GetValue(name)
|
| 2581 | proc, _ = ValueIsInvokableObj(val)
|
| 2582 | return proc is not None
|
| 2583 |
|
| 2584 | def InvokableNames(self):
|
| 2585 | # type: () -> List[str]
|
| 2586 | """Returns a *sorted* list of all invokable names
|
| 2587 |
|
| 2588 | Callers:
|
| 2589 | complete -A function
|
| 2590 | pp proc - should deprecate this
|
| 2591 | """
|
| 2592 | unique = NewDict() # type: Dict[str, bool]
|
| 2593 | for name in self.sh_funcs:
|
| 2594 | unique[name] = True
|
| 2595 |
|
| 2596 | top_frame = self.mem.var_stack[-1]
|
| 2597 | _AddNames(unique, top_frame)
|
| 2598 |
|
| 2599 | global_frame = self.mem.var_stack[0]
|
| 2600 | #log('%d %d', id(top_frame), id(global_frame))
|
| 2601 | if global_frame is not top_frame:
|
| 2602 | _AddNames(unique, global_frame)
|
| 2603 |
|
| 2604 | #log('%s', unique)
|
| 2605 |
|
| 2606 | names = unique.keys()
|
| 2607 | names.sort()
|
| 2608 |
|
| 2609 | return names
|
| 2610 |
|
| 2611 | def GetInvokable(self, name):
|
| 2612 | # type: (str) -> Tuple[Optional[value_t], Optional[Obj]]
|
| 2613 | """Find a proc, invokable Obj, or sh-func, in that order
|
| 2614 |
|
| 2615 | Callers:
|
| 2616 | executor.py: to actually run
|
| 2617 | meta_oils.py runproc lookup - this is not 'invoke', because it is
|
| 2618 | INTERIOR shell functions, procs, invokable Obj
|
| 2619 | """
|
| 2620 | val = self.mem.GetValue(name)
|
| 2621 |
|
| 2622 | if val.tag() == value_e.Proc:
|
| 2623 | return cast(value.Proc, val), None
|
| 2624 |
|
| 2625 | proc, self_val = ValueIsInvokableObj(val)
|
| 2626 | if proc:
|
| 2627 | return proc, self_val
|
| 2628 |
|
| 2629 | if name in self.sh_funcs:
|
| 2630 | return self.sh_funcs[name], None
|
| 2631 |
|
| 2632 | return None, None
|
| 2633 |
|
| 2634 |
|
| 2635 | #
|
| 2636 | # Wrappers to Set Variables
|
| 2637 | #
|
| 2638 |
|
| 2639 |
|
| 2640 | def OshLanguageSetValue(mem, lval, val, flags=0):
|
| 2641 | # type: (Mem, sh_lvalue_t, value_t, int) -> None
|
| 2642 | """Like 'setvar' (scope_e.LocalOnly), unless dynamic scope is on.
|
| 2643 |
|
| 2644 | That is, it respects shopt --unset dynamic_scope.
|
| 2645 |
|
| 2646 | Used for assignment builtins, (( a = b )), {fd}>out, ${x=}, etc.
|
| 2647 | """
|
| 2648 | which_scopes = mem.ScopesForWriting()
|
| 2649 | mem.SetValue(lval, val, which_scopes, flags=flags)
|
| 2650 |
|
| 2651 |
|
| 2652 | def BuiltinSetValue(mem, lval, val):
|
| 2653 | # type: (Mem, sh_lvalue_t, value_t) -> None
|
| 2654 | """Equivalent of x=$y
|
| 2655 |
|
| 2656 | Called by BuiltinSetString and BuiltinSetArray Used directly by
|
| 2657 | printf -v because it can mutate an array
|
| 2658 | """
|
| 2659 | mem.SetValue(lval, val, mem.ScopesForWriting())
|
| 2660 |
|
| 2661 |
|
| 2662 | def BuiltinSetString(mem, name, s):
|
| 2663 | # type: (Mem, str, str) -> None
|
| 2664 | """Set a string by looking up the stack.
|
| 2665 |
|
| 2666 | Used for 'read', 'getopts', completion builtins, etc.
|
| 2667 | """
|
| 2668 | assert isinstance(s, str)
|
| 2669 | BuiltinSetValue(mem, location.LName(name), value.Str(s))
|
| 2670 |
|
| 2671 |
|
| 2672 | def BuiltinSetArray(mem, name, a):
|
| 2673 | # type: (Mem, str, List[str]) -> None
|
| 2674 | """Set an array by looking up the stack.
|
| 2675 |
|
| 2676 | Used by compadjust, read -a, etc.
|
| 2677 | """
|
| 2678 | assert isinstance(a, list)
|
| 2679 | BuiltinSetValue(mem, location.LName(name), value.BashArray(a))
|
| 2680 |
|
| 2681 |
|
| 2682 | def SetGlobalString(mem, name, s):
|
| 2683 | # type: (Mem, str, str) -> None
|
| 2684 | """Helper for completion, etc."""
|
| 2685 | assert isinstance(s, str)
|
| 2686 | val = value.Str(s)
|
| 2687 | mem.SetNamed(location.LName(name), val, scope_e.GlobalOnly)
|
| 2688 |
|
| 2689 |
|
| 2690 | def SetGlobalArray(mem, name, a):
|
| 2691 | # type: (Mem, str, List[str]) -> None
|
| 2692 | """Used by completion, shell initialization, etc."""
|
| 2693 | assert isinstance(a, list)
|
| 2694 | mem.SetNamed(location.LName(name), value.BashArray(a), scope_e.GlobalOnly)
|
| 2695 |
|
| 2696 |
|
| 2697 | def SetGlobalValue(mem, name, val):
|
| 2698 | # type: (Mem, str, value_t) -> None
|
| 2699 | """Helper for completion, etc."""
|
| 2700 | mem.SetNamed(location.LName(name), val, scope_e.GlobalOnly)
|
| 2701 |
|
| 2702 |
|
| 2703 | def SetLocalValue(mem, name, val):
|
| 2704 | # type: (Mem, str, value_t) -> None
|
| 2705 | """For 'use' builtin."""
|
| 2706 | mem.SetNamed(location.LName(name), val, scope_e.LocalOnly)
|
| 2707 |
|
| 2708 |
|
| 2709 | def ExportGlobalString(mem, name, s):
|
| 2710 | # type: (Mem, str, str) -> None
|
| 2711 | """Helper for completion, $PWD, $OLDPWD, etc."""
|
| 2712 | assert isinstance(s, str)
|
| 2713 | val = value.Str(s)
|
| 2714 | mem.SetNamed(location.LName(name),
|
| 2715 | val,
|
| 2716 | scope_e.GlobalOnly,
|
| 2717 | flags=SetExport)
|
| 2718 |
|
| 2719 |
|
| 2720 | # TODO: remove in favor of EnvConfig
|
| 2721 | def SetStringInEnv(mem, var_name, s):
|
| 2722 | # type: (Mem, str, str) -> None
|
| 2723 | if mem.exec_opts.env_obj(): # e.g. ENV.YSH_HISTFILE
|
| 2724 | mem.env_dict[var_name] = value.Str(s)
|
| 2725 | else: # e.g. $YSH_HISTFILE
|
| 2726 | SetGlobalString(mem, var_name, s)
|
| 2727 |
|
| 2728 |
|
| 2729 | #
|
| 2730 | # Wrappers to Get Variables
|
| 2731 | #
|
| 2732 |
|
| 2733 |
|
| 2734 | def DynamicGetVar(mem, name, which_scopes):
|
| 2735 | # type: (Mem, str, scope_t) -> value_t
|
| 2736 | """
|
| 2737 | For getVar() and shvarGet()
|
| 2738 | """
|
| 2739 | val = mem.GetValue(name, which_scopes=which_scopes)
|
| 2740 |
|
| 2741 | # Undef is not a user-visible value!
|
| 2742 | # There's no way to distinguish null from undefined.
|
| 2743 | if val.tag() == value_e.Undef:
|
| 2744 | return value.Null
|
| 2745 |
|
| 2746 | return val
|
| 2747 |
|
| 2748 |
|
| 2749 | def GetString(mem, name):
|
| 2750 | # type: (Mem, str) -> str
|
| 2751 | """Wrapper around GetValue().
|
| 2752 |
|
| 2753 | Check that HOME, PWD, OLDPWD, etc. are strings. bash doesn't have these
|
| 2754 | errors because ${array} is ${array[0]}.
|
| 2755 |
|
| 2756 | TODO: We could also check this when you're storing variables?
|
| 2757 | """
|
| 2758 | val = mem.GetValue(name)
|
| 2759 | UP_val = val
|
| 2760 | with tagswitch(val) as case:
|
| 2761 | if case(value_e.Undef):
|
| 2762 | raise error.Runtime("$%s isn't defined" % name)
|
| 2763 | elif case(value_e.Str):
|
| 2764 | return cast(value.Str, UP_val).s
|
| 2765 | else:
|
| 2766 | # User would have to 'unset HOME' to get rid of exported flag
|
| 2767 | raise error.Runtime("$%s should be a string" % name)
|
| 2768 |
|
| 2769 |
|
| 2770 | def MaybeString(mem, name):
|
| 2771 | # type: (Mem, str) -> Optional[str]
|
| 2772 | """Like GetString(), but doesn't throw an exception."""
|
| 2773 | try:
|
| 2774 | return GetString(mem, name)
|
| 2775 | except error.Runtime:
|
| 2776 | return None
|
| 2777 |
|
| 2778 |
|
| 2779 | def GetInteger(mem, name):
|
| 2780 | # type: (Mem, str) -> int
|
| 2781 | """For OPTIND variable used in getopts builtin.
|
| 2782 |
|
| 2783 | TODO: it could be value.Int() ?
|
| 2784 | """
|
| 2785 | val = mem.GetValue(name)
|
| 2786 | if val.tag() != value_e.Str:
|
| 2787 | raise error.Runtime('$%s should be a string, got %s' %
|
| 2788 | (name, ui.ValType(val)))
|
| 2789 | s = cast(value.Str, val).s
|
| 2790 | try:
|
| 2791 | i = int(s)
|
| 2792 | except ValueError:
|
| 2793 | raise error.Runtime("$%s doesn't look like an integer, got %r" %
|
| 2794 | (name, s))
|
| 2795 | return i
|
| 2796 |
|
| 2797 |
|
| 2798 | # vim: sw=4
|