| 1 | #!/usr/bin/env python2
|
| 2 | from __future__ import print_function
|
| 3 |
|
| 4 | from _devbuild.gen import arg_types
|
| 5 | from _devbuild.gen.option_asdl import builtin_i
|
| 6 | from _devbuild.gen.runtime_asdl import (
|
| 7 | scope_e,
|
| 8 | cmd_value,
|
| 9 | AssignArg,
|
| 10 | )
|
| 11 | from _devbuild.gen.value_asdl import (value, value_e, value_t, LeftName)
|
| 12 | from _devbuild.gen.syntax_asdl import loc, loc_t, word_t
|
| 13 |
|
| 14 | from core import error
|
| 15 | from core.error import e_usage
|
| 16 | from core import state
|
| 17 | from core import vm
|
| 18 | from frontend import flag_util
|
| 19 | from frontend import args
|
| 20 | from mycpp.mylib import log
|
| 21 | from osh import cmd_eval
|
| 22 | from osh import sh_expr_eval
|
| 23 | from data_lang import j8_lite
|
| 24 |
|
| 25 | from typing import cast, Optional, List, TYPE_CHECKING
|
| 26 | if TYPE_CHECKING:
|
| 27 | from core.state import Mem
|
| 28 | from core import optview
|
| 29 | from display import ui
|
| 30 | from frontend.args import _Attributes
|
| 31 |
|
| 32 | _ = log
|
| 33 |
|
| 34 | _OTHER = 0
|
| 35 | _READONLY = 1
|
| 36 | _EXPORT = 2
|
| 37 |
|
| 38 |
|
| 39 | def _PrintVariables(mem, cmd_val, attrs, print_flags, builtin=_OTHER):
|
| 40 | # type: (Mem, cmd_value.Assign, _Attributes, bool, int) -> int
|
| 41 | """
|
| 42 | Args:
|
| 43 | print_flags: whether to print flags
|
| 44 | builtin: is it the readonly or export builtin?
|
| 45 | """
|
| 46 | flag = attrs.attrs
|
| 47 |
|
| 48 | # Turn dynamic vars to static.
|
| 49 | tmp_g = flag.get('g')
|
| 50 | tmp_a = flag.get('a')
|
| 51 | tmp_A = flag.get('A')
|
| 52 |
|
| 53 | flag_g = (cast(value.Bool, tmp_g).b
|
| 54 | if tmp_g and tmp_g.tag() == value_e.Bool else False)
|
| 55 | flag_a = (cast(value.Bool, tmp_a).b
|
| 56 | if tmp_a and tmp_a.tag() == value_e.Bool else False)
|
| 57 | flag_A = (cast(value.Bool, tmp_A).b
|
| 58 | if tmp_A and tmp_A.tag() == value_e.Bool else False)
|
| 59 |
|
| 60 | tmp_n = flag.get('n')
|
| 61 | tmp_r = flag.get('r')
|
| 62 | tmp_x = flag.get('x')
|
| 63 |
|
| 64 | #log('FLAG %r', flag)
|
| 65 |
|
| 66 | # SUBTLE: export -n vs. declare -n. flag vs. OPTION.
|
| 67 | # flags are value.Bool, while options are Undef or Str.
|
| 68 | # '+', '-', or None
|
| 69 | flag_n = (cast(value.Str, tmp_n).s if tmp_n and tmp_n.tag() == value_e.Str
|
| 70 | else None) # type: Optional[str]
|
| 71 | flag_r = (cast(value.Str, tmp_r).s if tmp_r and tmp_r.tag() == value_e.Str
|
| 72 | else None) # type: Optional[str]
|
| 73 | flag_x = (cast(value.Str, tmp_x).s if tmp_x and tmp_x.tag() == value_e.Str
|
| 74 | else None) # type: Optional[str]
|
| 75 |
|
| 76 | if cmd_val.builtin_id == builtin_i.local:
|
| 77 | if flag_g and not mem.IsGlobalScope():
|
| 78 | return 1
|
| 79 | which_scopes = scope_e.LocalOnly
|
| 80 | elif flag_g:
|
| 81 | which_scopes = scope_e.GlobalOnly
|
| 82 | else:
|
| 83 | which_scopes = mem.ScopesForReading() # reading
|
| 84 |
|
| 85 | if len(cmd_val.pairs) == 0:
|
| 86 | print_all = True
|
| 87 | cells = mem.GetAllCells(which_scopes)
|
| 88 | names = sorted(cells) # type: List[str]
|
| 89 | else:
|
| 90 | print_all = False
|
| 91 | names = []
|
| 92 | cells = {}
|
| 93 | for pair in cmd_val.pairs:
|
| 94 | name = pair.var_name
|
| 95 | if pair.rval and pair.rval.tag() == value_e.Str:
|
| 96 | # Invalid: declare -p foo=bar
|
| 97 | # Add a sentinel so we skip it, but know to exit with status 1.
|
| 98 | s = cast(value.Str, pair.rval).s
|
| 99 | invalid = "%s=%s" % (name, s)
|
| 100 | names.append(invalid)
|
| 101 | cells[invalid] = None
|
| 102 | else:
|
| 103 | names.append(name)
|
| 104 | cells[name] = mem.GetCell(name, which_scopes)
|
| 105 |
|
| 106 | count = 0
|
| 107 | for name in names:
|
| 108 | cell = cells[name]
|
| 109 | if cell is None:
|
| 110 | continue # Invalid
|
| 111 | val = cell.val
|
| 112 | #log('name %r %s', name, val)
|
| 113 |
|
| 114 | if val.tag() == value_e.Undef:
|
| 115 | continue
|
| 116 | if builtin == _READONLY and not cell.readonly:
|
| 117 | continue
|
| 118 | if builtin == _EXPORT and not cell.exported:
|
| 119 | continue
|
| 120 |
|
| 121 | if flag_n == '-' and not cell.nameref:
|
| 122 | continue
|
| 123 | if flag_n == '+' and cell.nameref:
|
| 124 | continue
|
| 125 | if flag_r == '-' and not cell.readonly:
|
| 126 | continue
|
| 127 | if flag_r == '+' and cell.readonly:
|
| 128 | continue
|
| 129 | if flag_x == '-' and not cell.exported:
|
| 130 | continue
|
| 131 | if flag_x == '+' and cell.exported:
|
| 132 | continue
|
| 133 |
|
| 134 | if flag_a and val.tag() != value_e.BashArray:
|
| 135 | continue
|
| 136 | if flag_A and val.tag() != value_e.BashAssoc:
|
| 137 | continue
|
| 138 |
|
| 139 | decl = [] # type: List[str]
|
| 140 | if print_flags:
|
| 141 | flags = [] # type: List[str]
|
| 142 | if cell.nameref:
|
| 143 | flags.append('n')
|
| 144 | if cell.readonly:
|
| 145 | flags.append('r')
|
| 146 | if cell.exported:
|
| 147 | flags.append('x')
|
| 148 | if val.tag() == value_e.BashArray:
|
| 149 | flags.append('a')
|
| 150 | elif val.tag() == value_e.BashAssoc:
|
| 151 | flags.append('A')
|
| 152 | if len(flags) == 0:
|
| 153 | flags.append('-')
|
| 154 |
|
| 155 | decl.extend(["declare -", ''.join(flags), " ", name])
|
| 156 | else:
|
| 157 | decl.append(name)
|
| 158 |
|
| 159 | if val.tag() == value_e.Str:
|
| 160 | str_val = cast(value.Str, val)
|
| 161 | decl.extend(["=", j8_lite.MaybeShellEncode(str_val.s)])
|
| 162 |
|
| 163 | elif val.tag() == value_e.BashArray:
|
| 164 | array_val = cast(value.BashArray, val)
|
| 165 |
|
| 166 | # mycpp rewrite: None in array_val.strs
|
| 167 | has_holes = False
|
| 168 | for s in array_val.strs:
|
| 169 | if s is None:
|
| 170 | has_holes = True
|
| 171 | break
|
| 172 |
|
| 173 | if has_holes:
|
| 174 | # Note: Arrays with unset elements are printed in the form:
|
| 175 | # declare -p arr=(); arr[3]='' arr[4]='foo' ...
|
| 176 | decl.append("=()")
|
| 177 | first = True
|
| 178 | for i, element in enumerate(array_val.strs):
|
| 179 | if element is not None:
|
| 180 | if first:
|
| 181 | decl.append(";")
|
| 182 | first = False
|
| 183 | decl.extend([
|
| 184 | " ", name, "[",
|
| 185 | str(i), "]=",
|
| 186 | j8_lite.MaybeShellEncode(element)
|
| 187 | ])
|
| 188 | else:
|
| 189 | body = [] # type: List[str]
|
| 190 | for element in array_val.strs:
|
| 191 | if len(body) > 0:
|
| 192 | body.append(" ")
|
| 193 | body.append(j8_lite.MaybeShellEncode(element))
|
| 194 | decl.extend(["=(", ''.join(body), ")"])
|
| 195 |
|
| 196 | elif val.tag() == value_e.BashAssoc:
|
| 197 | assoc_val = cast(value.BashAssoc, val)
|
| 198 | body = []
|
| 199 | for key in sorted(assoc_val.d):
|
| 200 | if len(body) > 0:
|
| 201 | body.append(" ")
|
| 202 |
|
| 203 | key_quoted = j8_lite.ShellEncode(key)
|
| 204 | value_quoted = j8_lite.MaybeShellEncode(assoc_val.d[key])
|
| 205 |
|
| 206 | body.extend(["[", key_quoted, "]=", value_quoted])
|
| 207 | if len(body) > 0:
|
| 208 | decl.extend(["=(", ''.join(body), ")"])
|
| 209 |
|
| 210 | else:
|
| 211 | pass # note: other types silently ignored
|
| 212 |
|
| 213 | print(''.join(decl))
|
| 214 | count += 1
|
| 215 |
|
| 216 | if print_all or count == len(names):
|
| 217 | return 0
|
| 218 | else:
|
| 219 | return 1
|
| 220 |
|
| 221 |
|
| 222 | def _ExportReadonly(mem, pair, flags):
|
| 223 | # type: (Mem, AssignArg, int) -> None
|
| 224 | """For 'export' and 'readonly' to respect += and flags.
|
| 225 |
|
| 226 | Like 'setvar' (scope_e.LocalOnly), unless dynamic scope is on. That is, it
|
| 227 | respects shopt --unset dynamic_scope.
|
| 228 |
|
| 229 | Used for assignment builtins, (( a = b )), {fd}>out, ${x=}, etc.
|
| 230 | """
|
| 231 | which_scopes = mem.ScopesForWriting()
|
| 232 |
|
| 233 | lval = LeftName(pair.var_name, pair.blame_word)
|
| 234 | if pair.plus_eq:
|
| 235 | old_val = sh_expr_eval.OldValue(lval, mem, None) # ignore set -u
|
| 236 | # When 'export e+=', then rval is value.Str('')
|
| 237 | # When 'export foo', the pair.plus_eq flag is false.
|
| 238 | assert pair.rval is not None
|
| 239 | val = cmd_eval.PlusEquals(old_val, pair.rval)
|
| 240 | else:
|
| 241 | # NOTE: when rval is None, only flags are changed
|
| 242 | val = pair.rval
|
| 243 |
|
| 244 | mem.SetNamed(lval, val, which_scopes, flags=flags)
|
| 245 |
|
| 246 |
|
| 247 | class Export(vm._AssignBuiltin):
|
| 248 |
|
| 249 | def __init__(self, mem, errfmt):
|
| 250 | # type: (Mem, ui.ErrorFormatter) -> None
|
| 251 | self.mem = mem
|
| 252 | self.errfmt = errfmt
|
| 253 |
|
| 254 | def Run(self, cmd_val):
|
| 255 | # type: (cmd_value.Assign) -> int
|
| 256 | arg_r = args.Reader(cmd_val.argv, locs=cmd_val.arg_locs)
|
| 257 | arg_r.Next()
|
| 258 | attrs = flag_util.Parse('export_', arg_r)
|
| 259 | arg = arg_types.export_(attrs.attrs)
|
| 260 | #arg = attrs
|
| 261 |
|
| 262 | if arg.f:
|
| 263 | e_usage(
|
| 264 | "doesn't accept -f because it's dangerous. "
|
| 265 | "(The code can usually be restructured with 'source')",
|
| 266 | loc.Missing)
|
| 267 |
|
| 268 | if arg.p or len(cmd_val.pairs) == 0:
|
| 269 | return _PrintVariables(self.mem,
|
| 270 | cmd_val,
|
| 271 | attrs,
|
| 272 | True,
|
| 273 | builtin=_EXPORT)
|
| 274 |
|
| 275 | if arg.n:
|
| 276 | for pair in cmd_val.pairs:
|
| 277 | if pair.rval is not None:
|
| 278 | e_usage("doesn't accept RHS with -n",
|
| 279 | loc.Word(pair.blame_word))
|
| 280 |
|
| 281 | # NOTE: we don't care if it wasn't found, like bash.
|
| 282 | self.mem.ClearFlag(pair.var_name, state.ClearExport)
|
| 283 | else:
|
| 284 | for pair in cmd_val.pairs:
|
| 285 | _ExportReadonly(self.mem, pair, state.SetExport)
|
| 286 |
|
| 287 | return 0
|
| 288 |
|
| 289 |
|
| 290 | def _ReconcileTypes(rval, flag_a, flag_A, blame_word):
|
| 291 | # type: (Optional[value_t], bool, bool, word_t) -> value_t
|
| 292 | """Check that -a and -A flags are consistent with RHS.
|
| 293 |
|
| 294 | Special case: () is allowed to mean empty indexed array or empty assoc array
|
| 295 | if the context is clear.
|
| 296 |
|
| 297 | Shared between NewVar and Readonly.
|
| 298 | """
|
| 299 | if flag_a and rval is not None and rval.tag() != value_e.BashArray:
|
| 300 | e_usage("Got -a but RHS isn't an array", loc.Word(blame_word))
|
| 301 |
|
| 302 | if flag_A and rval:
|
| 303 | # Special case: declare -A A=() is OK. The () is changed to mean an empty
|
| 304 | # associative array.
|
| 305 | if rval.tag() == value_e.BashArray:
|
| 306 | array_val = cast(value.BashArray, rval)
|
| 307 | if len(array_val.strs) == 0:
|
| 308 | return value.BashAssoc({})
|
| 309 | #return value.BashArray([])
|
| 310 |
|
| 311 | if rval.tag() != value_e.BashAssoc:
|
| 312 | e_usage("Got -A but RHS isn't an associative array",
|
| 313 | loc.Word(blame_word))
|
| 314 |
|
| 315 | return rval
|
| 316 |
|
| 317 |
|
| 318 | class Readonly(vm._AssignBuiltin):
|
| 319 |
|
| 320 | def __init__(self, mem, errfmt):
|
| 321 | # type: (Mem, ui.ErrorFormatter) -> None
|
| 322 | self.mem = mem
|
| 323 | self.errfmt = errfmt
|
| 324 |
|
| 325 | def Run(self, cmd_val):
|
| 326 | # type: (cmd_value.Assign) -> int
|
| 327 | arg_r = args.Reader(cmd_val.argv, locs=cmd_val.arg_locs)
|
| 328 | arg_r.Next()
|
| 329 | attrs = flag_util.Parse('readonly', arg_r)
|
| 330 | arg = arg_types.readonly(attrs.attrs)
|
| 331 |
|
| 332 | if arg.p or len(cmd_val.pairs) == 0:
|
| 333 | return _PrintVariables(self.mem,
|
| 334 | cmd_val,
|
| 335 | attrs,
|
| 336 | True,
|
| 337 | builtin=_READONLY)
|
| 338 |
|
| 339 | for pair in cmd_val.pairs:
|
| 340 | if pair.rval is None:
|
| 341 | if arg.a:
|
| 342 | rval = value.BashArray([]) # type: value_t
|
| 343 | elif arg.A:
|
| 344 | rval = value.BashAssoc({})
|
| 345 | else:
|
| 346 | rval = None
|
| 347 | else:
|
| 348 | rval = pair.rval
|
| 349 |
|
| 350 | rval = _ReconcileTypes(rval, arg.a, arg.A, pair.blame_word)
|
| 351 |
|
| 352 | # NOTE:
|
| 353 | # - when rval is None, only flags are changed
|
| 354 | # - dynamic scope because flags on locals can be changed, etc.
|
| 355 | _ExportReadonly(self.mem, pair, state.SetReadOnly)
|
| 356 |
|
| 357 | return 0
|
| 358 |
|
| 359 |
|
| 360 | class NewVar(vm._AssignBuiltin):
|
| 361 | """declare/typeset/local."""
|
| 362 |
|
| 363 | def __init__(self, mem, procs, exec_opts, errfmt):
|
| 364 | # type: (Mem, state.Procs, optview.Exec, ui.ErrorFormatter) -> None
|
| 365 | self.mem = mem
|
| 366 | self.procs = procs
|
| 367 | self.exec_opts = exec_opts
|
| 368 | self.errfmt = errfmt
|
| 369 |
|
| 370 | def _PrintFuncs(self, names):
|
| 371 | # type: (List[str]) -> int
|
| 372 | status = 0
|
| 373 | for name in names:
|
| 374 | if self.procs.GetShellFunc(name):
|
| 375 | print(name)
|
| 376 | # TODO: Could print LST for -f, or render LST. Bash does this. 'trap'
|
| 377 | # could use that too.
|
| 378 | else:
|
| 379 | status = 1
|
| 380 | return status
|
| 381 |
|
| 382 | def Run(self, cmd_val):
|
| 383 | # type: (cmd_value.Assign) -> int
|
| 384 | arg_r = args.Reader(cmd_val.argv, locs=cmd_val.arg_locs)
|
| 385 | arg_r.Next()
|
| 386 | attrs = flag_util.Parse('new_var', arg_r)
|
| 387 | arg = arg_types.new_var(attrs.attrs)
|
| 388 |
|
| 389 | status = 0
|
| 390 |
|
| 391 | if arg.f:
|
| 392 | names = arg_r.Rest()
|
| 393 | if len(names):
|
| 394 | # This is only used for a STATUS QUERY now. We only show the name,
|
| 395 | # not the body.
|
| 396 | status = self._PrintFuncs(names)
|
| 397 | else:
|
| 398 | # Disallow this since it would be incompatible.
|
| 399 | e_usage('with -f expects function names', loc.Missing)
|
| 400 | return status
|
| 401 |
|
| 402 | if arg.F:
|
| 403 | names = arg_r.Rest()
|
| 404 | if len(names):
|
| 405 | status = self._PrintFuncs(names)
|
| 406 | else:
|
| 407 | # bash quirk: with no names, they're printed in a different format!
|
| 408 | for func_name in self.procs.ShellFuncNames():
|
| 409 | print('declare -f %s' % (func_name))
|
| 410 | return status
|
| 411 |
|
| 412 | if arg.p: # Lookup and print variables.
|
| 413 | return _PrintVariables(self.mem, cmd_val, attrs, True)
|
| 414 | elif len(cmd_val.pairs) == 0:
|
| 415 | return _PrintVariables(self.mem, cmd_val, attrs, False)
|
| 416 |
|
| 417 | if not self.exec_opts.ignore_flags_not_impl():
|
| 418 | if arg.i:
|
| 419 | e_usage(
|
| 420 | "doesn't implement flag -i (shopt --set ignore_flags_not_impl)",
|
| 421 | loc.Missing)
|
| 422 |
|
| 423 | if arg.l or arg.u:
|
| 424 | # Just print a warning! The program may still run.
|
| 425 | self.errfmt.Print_(
|
| 426 | "Warning: OSH doesn't implement flags -l or -u (shopt --set ignore_flags_not_impl)",
|
| 427 | loc.Missing)
|
| 428 |
|
| 429 | #
|
| 430 | # Set variables
|
| 431 | #
|
| 432 |
|
| 433 | if cmd_val.builtin_id == builtin_i.local:
|
| 434 | which_scopes = scope_e.LocalOnly
|
| 435 | else: # declare/typeset
|
| 436 | if arg.g:
|
| 437 | which_scopes = scope_e.GlobalOnly
|
| 438 | else:
|
| 439 | which_scopes = scope_e.LocalOnly
|
| 440 |
|
| 441 | flags = 0
|
| 442 | if arg.x == '-':
|
| 443 | flags |= state.SetExport
|
| 444 | if arg.r == '-':
|
| 445 | flags |= state.SetReadOnly
|
| 446 | if arg.n == '-':
|
| 447 | flags |= state.SetNameref
|
| 448 |
|
| 449 | if arg.x == '+':
|
| 450 | flags |= state.ClearExport
|
| 451 | if arg.r == '+':
|
| 452 | flags |= state.ClearReadOnly
|
| 453 | if arg.n == '+':
|
| 454 | flags |= state.ClearNameref
|
| 455 |
|
| 456 | for pair in cmd_val.pairs:
|
| 457 | rval = pair.rval
|
| 458 | # declare -a foo=(a b); declare -a foo; should not reset to empty array
|
| 459 | if rval is None and (arg.a or arg.A):
|
| 460 | old_val = self.mem.GetValue(pair.var_name)
|
| 461 | if arg.a:
|
| 462 | if old_val.tag() != value_e.BashArray:
|
| 463 | rval = value.BashArray([])
|
| 464 | elif arg.A:
|
| 465 | if old_val.tag() != value_e.BashAssoc:
|
| 466 | rval = value.BashAssoc({})
|
| 467 |
|
| 468 | lval = LeftName(pair.var_name, pair.blame_word)
|
| 469 |
|
| 470 | if pair.plus_eq:
|
| 471 | old_val = sh_expr_eval.OldValue(lval, self.mem,
|
| 472 | None) # ignore set -u
|
| 473 | # When 'typeset e+=', then rval is value.Str('')
|
| 474 | # When 'typeset foo', the pair.plus_eq flag is false.
|
| 475 | assert pair.rval is not None
|
| 476 | rval = cmd_eval.PlusEquals(old_val, pair.rval)
|
| 477 | else:
|
| 478 | rval = _ReconcileTypes(rval, arg.a, arg.A, pair.blame_word)
|
| 479 |
|
| 480 | self.mem.SetNamed(lval, rval, which_scopes, flags=flags)
|
| 481 |
|
| 482 | return status
|
| 483 |
|
| 484 |
|
| 485 | # TODO:
|
| 486 | # - It would make more sense to treat no args as an error (bash doesn't.)
|
| 487 | # - Should we have strict builtins? Or just make it stricter?
|
| 488 | # - Typed args: unset (mylist[0]) is like Python's del
|
| 489 | # - It has the same word as 'setvar', which makes sense
|
| 490 |
|
| 491 |
|
| 492 | class Unset(vm._Builtin):
|
| 493 |
|
| 494 | def __init__(
|
| 495 | self,
|
| 496 | mem, # type: state.Mem
|
| 497 | procs, # type: state.Procs
|
| 498 | unsafe_arith, # type: sh_expr_eval.UnsafeArith
|
| 499 | errfmt, # type: ui.ErrorFormatter
|
| 500 | ):
|
| 501 | # type: (...) -> None
|
| 502 | self.mem = mem
|
| 503 | self.procs = procs
|
| 504 | self.unsafe_arith = unsafe_arith
|
| 505 | self.errfmt = errfmt
|
| 506 |
|
| 507 | def _UnsetVar(self, arg, location, proc_fallback):
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| 508 | # type: (str, loc_t, bool) -> bool
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| 509 | """
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| 510 | Returns:
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| 511 | bool: whether the 'unset' builtin should succeed with code 0.
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| 512 | """
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| 513 | lval = self.unsafe_arith.ParseLValue(arg, location)
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| 514 |
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| 515 | #log('unsafe lval %s', lval)
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| 516 | found = False
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| 517 | try:
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| 518 | found = self.mem.Unset(lval, scope_e.Shopt)
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| 519 | except error.Runtime as e:
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| 520 | # note: in bash, myreadonly=X fails, but declare myreadonly=X doesn't
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| 521 | # fail because it's a builtin. So I guess the same is true of 'unset'.
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| 522 | msg = e.UserErrorString()
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| 523 | self.errfmt.Print_(msg, blame_loc=location)
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| 524 | return False
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| 525 |
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| 526 | if proc_fallback and not found:
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| 527 | self.procs.EraseShellFunc(arg)
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| 528 |
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| 529 | return True
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| 530 |
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| 531 | def Run(self, cmd_val):
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| 532 | # type: (cmd_value.Argv) -> int
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| 533 | attrs, arg_r = flag_util.ParseCmdVal('unset', cmd_val)
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| 534 | arg = arg_types.unset(attrs.attrs)
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| 535 |
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| 536 | argv, arg_locs = arg_r.Rest2()
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| 537 | for i, name in enumerate(argv):
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| 538 | location = arg_locs[i]
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| 539 |
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| 540 | if arg.f:
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| 541 | self.procs.EraseShellFunc(name)
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| 542 |
|
| 543 | elif arg.v:
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| 544 | if not self._UnsetVar(name, location, False):
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| 545 | return 1
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| 546 |
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| 547 | else:
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| 548 | # proc_fallback: Try to delete var first, then func.
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| 549 | if not self._UnsetVar(name, location, True):
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| 550 | return 1
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| 551 |
|
| 552 | return 0
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| 553 |
|
| 554 |
|
| 555 | class Shift(vm._Builtin):
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| 556 |
|
| 557 | def __init__(self, mem):
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| 558 | # type: (Mem) -> None
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| 559 | self.mem = mem
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| 560 |
|
| 561 | def Run(self, cmd_val):
|
| 562 | # type: (cmd_value.Argv) -> int
|
| 563 | num_args = len(cmd_val.argv) - 1
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| 564 | if num_args == 0:
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| 565 | n = 1
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| 566 | elif num_args == 1:
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| 567 | arg = cmd_val.argv[1]
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| 568 | try:
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| 569 | n = int(arg)
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| 570 | except ValueError:
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| 571 | e_usage("Invalid shift argument %r" % arg, loc.Missing)
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| 572 | else:
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| 573 | e_usage('got too many arguments', loc.Missing)
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| 574 |
|
| 575 | return self.mem.Shift(n)
|