1 | """
|
2 | word_eval.py - Evaluator for the word language.
|
3 | """
|
4 |
|
5 | from _devbuild.gen.id_kind_asdl import Id, Kind, Kind_str
|
6 | from _devbuild.gen.syntax_asdl import (
|
7 | Token,
|
8 | SimpleVarSub,
|
9 | loc,
|
10 | loc_t,
|
11 | BracedVarSub,
|
12 | CommandSub,
|
13 | bracket_op,
|
14 | bracket_op_e,
|
15 | suffix_op,
|
16 | suffix_op_e,
|
17 | ShArrayLiteral,
|
18 | SingleQuoted,
|
19 | DoubleQuoted,
|
20 | word_e,
|
21 | word_t,
|
22 | CompoundWord,
|
23 | rhs_word,
|
24 | rhs_word_e,
|
25 | rhs_word_t,
|
26 | word_part,
|
27 | word_part_e,
|
28 | )
|
29 | from _devbuild.gen.runtime_asdl import (
|
30 | part_value,
|
31 | part_value_e,
|
32 | part_value_t,
|
33 | cmd_value,
|
34 | cmd_value_e,
|
35 | cmd_value_t,
|
36 | AssignArg,
|
37 | a_index,
|
38 | a_index_e,
|
39 | VTestPlace,
|
40 | VarSubState,
|
41 | Piece,
|
42 | )
|
43 | from _devbuild.gen.option_asdl import option_i, builtin_i
|
44 | from _devbuild.gen.value_asdl import (
|
45 | value,
|
46 | value_e,
|
47 | value_t,
|
48 | sh_lvalue,
|
49 | sh_lvalue_t,
|
50 | )
|
51 | from core import error
|
52 | from core import pyos
|
53 | from core import pyutil
|
54 | from core import state
|
55 | from core import ui
|
56 | from core import util
|
57 | from data_lang import j8
|
58 | from data_lang import j8_lite
|
59 | from core.error import e_die
|
60 | from frontend import consts
|
61 | from frontend import lexer
|
62 | from frontend import location
|
63 | from mycpp import mops
|
64 | from mycpp.mylib import log, tagswitch, NewDict
|
65 | from osh import braces
|
66 | from osh import glob_
|
67 | from osh import string_ops
|
68 | from osh import word_
|
69 | from ysh import expr_eval
|
70 | from ysh import val_ops
|
71 |
|
72 | from typing import Optional, Tuple, List, Dict, cast, TYPE_CHECKING
|
73 |
|
74 | if TYPE_CHECKING:
|
75 | from _devbuild.gen.syntax_asdl import word_part_t
|
76 | from _devbuild.gen.option_asdl import builtin_t
|
77 | from core import optview
|
78 | from core.state import Mem
|
79 | from core.ui import ErrorFormatter
|
80 | from core.vm import _Executor
|
81 | from osh.split import SplitContext
|
82 | from osh import prompt
|
83 | from osh import sh_expr_eval
|
84 |
|
85 | # Flags for _EvalWordToParts and _EvalWordPart (not all are used for both)
|
86 | QUOTED = 1 << 0
|
87 | IS_SUBST = 1 << 1
|
88 |
|
89 | EXTGLOB_FILES = 1 << 2 # allow @(cc) from file system?
|
90 | EXTGLOB_MATCH = 1 << 3 # allow @(cc) in pattern matching?
|
91 | EXTGLOB_NESTED = 1 << 4 # for @(one|!(two|three))
|
92 |
|
93 | # For EvalWordToString
|
94 | QUOTE_FNMATCH = 1 << 5
|
95 | QUOTE_ERE = 1 << 6
|
96 |
|
97 | # For compatibility, ${BASH_SOURCE} and ${BASH_SOURCE[@]} are both valid.
|
98 | # Ditto for ${FUNCNAME} and ${BASH_LINENO}.
|
99 | _STRING_AND_ARRAY = ['BASH_SOURCE', 'FUNCNAME', 'BASH_LINENO']
|
100 |
|
101 |
|
102 | def ShouldArrayDecay(var_name, exec_opts, is_plain_var_sub=True):
|
103 | # type: (str, optview.Exec, bool) -> bool
|
104 | """Return whether we should allow ${a} to mean ${a[0]}."""
|
105 | return (not exec_opts.strict_array() or
|
106 | is_plain_var_sub and var_name in _STRING_AND_ARRAY)
|
107 |
|
108 |
|
109 | def DecayArray(val):
|
110 | # type: (value_t) -> value_t
|
111 | """Resolve ${array} to ${array[0]}."""
|
112 | if val.tag() == value_e.BashArray:
|
113 | array_val = cast(value.BashArray, val)
|
114 | s = array_val.strs[0] if len(array_val.strs) else None
|
115 | elif val.tag() == value_e.BashAssoc:
|
116 | assoc_val = cast(value.BashAssoc, val)
|
117 | s = assoc_val.d['0'] if '0' in assoc_val.d else None
|
118 | else:
|
119 | raise AssertionError(val.tag())
|
120 |
|
121 | if s is None:
|
122 | return value.Undef
|
123 | else:
|
124 | return value.Str(s)
|
125 |
|
126 |
|
127 | def GetArrayItem(strs, index):
|
128 | # type: (List[str], int) -> Optional[str]
|
129 |
|
130 | n = len(strs)
|
131 | if index < 0:
|
132 | index += n
|
133 |
|
134 | if 0 <= index and index < n:
|
135 | # TODO: strs->index() has a redundant check for (i < 0)
|
136 | s = strs[index]
|
137 | # note: s could be None because representation is sparse
|
138 | else:
|
139 | s = None
|
140 | return s
|
141 |
|
142 |
|
143 | def _DetectMetaBuiltinStr(s):
|
144 | # type: (str) -> bool
|
145 | """
|
146 | We need to detect all of these cases:
|
147 |
|
148 | builtin local
|
149 | command local
|
150 | builtin builtin local
|
151 | builtin command local
|
152 |
|
153 | Fundamentally, assignment builtins have different WORD EVALUATION RULES
|
154 | for a=$x (no word splitting), so it seems hard to do this in
|
155 | meta_osh.Builtin() or meta_osh.Command()
|
156 | """
|
157 | return (consts.LookupNormalBuiltin(s)
|
158 | in (builtin_i.builtin, builtin_i.command))
|
159 |
|
160 |
|
161 | def _DetectMetaBuiltin(val0):
|
162 | # type: (part_value_t) -> bool
|
163 | UP_val0 = val0
|
164 | if val0.tag() == part_value_e.String:
|
165 | val0 = cast(Piece, UP_val0)
|
166 | if not val0.quoted:
|
167 | return _DetectMetaBuiltinStr(val0.s)
|
168 | return False
|
169 |
|
170 |
|
171 | # Use libc to parse NAME, NAME=value, and NAME+=value. We want submatch
|
172 | # extraction, but I haven't used that in re2c, and we would need a new kind of
|
173 | # binding.
|
174 | #
|
175 | ASSIGN_ARG_RE = '^([a-zA-Z_][a-zA-Z0-9_]*)((=|\+=)(.*))?$'
|
176 |
|
177 | # Eggex equivalent:
|
178 | #
|
179 | # VarName = /
|
180 | # [a-z A-Z _ ]
|
181 | # [a-z A-Z 0-9 _ ]*
|
182 | # /
|
183 | #
|
184 | # SplitArg = /
|
185 | # %begin
|
186 | # < VarName >
|
187 | # < < '=' | '+=' > < dot* > > ?
|
188 | # %end
|
189 | # /
|
190 | # Note: must use < > for grouping because there is no non-capturing group.
|
191 |
|
192 |
|
193 | def _SplitAssignArg(arg, blame_word):
|
194 | # type: (str, CompoundWord) -> AssignArg
|
195 | """Dynamically parse argument to declare, export, etc.
|
196 |
|
197 | This is a fallback to the static parsing done below.
|
198 | """
|
199 | # Note: it would be better to cache regcomp(), but we don't have an API for
|
200 | # that, and it probably isn't a bottleneck now
|
201 | m = util.RegexSearch(ASSIGN_ARG_RE, arg)
|
202 | if m is None:
|
203 | e_die("Assignment builtin expected NAME=value, got %r" % arg,
|
204 | blame_word)
|
205 |
|
206 | var_name = m[1]
|
207 | # m[2] is used for grouping; ERE doesn't have non-capturing groups
|
208 |
|
209 | op = m[3]
|
210 | assert op is not None, op
|
211 | if len(op): # declare NAME=
|
212 | val = value.Str(m[4]) # type: Optional[value_t]
|
213 | append = op[0] == '+'
|
214 | else: # declare NAME
|
215 | val = None # no operator
|
216 | append = False
|
217 |
|
218 | return AssignArg(var_name, val, append, blame_word)
|
219 |
|
220 |
|
221 | # NOTE: Could be done with util.BackslashEscape like glob_.GlobEscape().
|
222 | def _BackslashEscape(s):
|
223 | # type: (str) -> str
|
224 | """Double up backslashes.
|
225 |
|
226 | Useful for strings about to be globbed and strings about to be IFS
|
227 | escaped.
|
228 | """
|
229 | return s.replace('\\', '\\\\')
|
230 |
|
231 |
|
232 | def _ValueToPartValue(val, quoted, part_loc):
|
233 | # type: (value_t, bool, word_part_t) -> part_value_t
|
234 | """Helper for VarSub evaluation.
|
235 |
|
236 | Called by _EvalBracedVarSub and _EvalWordPart for SimpleVarSub.
|
237 | """
|
238 | UP_val = val
|
239 |
|
240 | with tagswitch(val) as case:
|
241 | if case(value_e.Undef):
|
242 | # This happens in the case of ${undef+foo}. We skipped _EmptyStrOrError,
|
243 | # but we have to append to the empty string.
|
244 | return Piece('', quoted, not quoted)
|
245 |
|
246 | elif case(value_e.Str):
|
247 | val = cast(value.Str, UP_val)
|
248 | return Piece(val.s, quoted, not quoted)
|
249 |
|
250 | elif case(value_e.BashArray):
|
251 | val = cast(value.BashArray, UP_val)
|
252 | return part_value.Array(val.strs)
|
253 |
|
254 | elif case(value_e.BashAssoc):
|
255 | val = cast(value.BashAssoc, UP_val)
|
256 | # bash behavior: splice values!
|
257 | return part_value.Array(val.d.values())
|
258 |
|
259 | # Cases added for YSH
|
260 | # value_e.List is also here - we use val_ops.stringify()s err message
|
261 | elif case(value_e.Null, value_e.Bool, value_e.Int, value_e.Float,
|
262 | value_e.Eggex, value_e.List):
|
263 | s = val_ops.Stringify(val, loc.Missing)
|
264 | return Piece(s, quoted, not quoted)
|
265 |
|
266 | else:
|
267 | raise error.TypeErr(val, "Can't substitute into word",
|
268 | loc.WordPart(part_loc))
|
269 |
|
270 | raise AssertionError('for -Wreturn-type in C++')
|
271 |
|
272 |
|
273 | def _MakeWordFrames(part_vals):
|
274 | # type: (List[part_value_t]) -> List[List[Piece]]
|
275 | """A word evaluates to a flat list of part_value (String or Array). frame
|
276 | is a portion that results in zero or more args. It can never be joined.
|
277 | This idea exists because of arrays like "$@" and "${a[@]}".
|
278 |
|
279 | Example:
|
280 |
|
281 | a=(1 '2 3' 4)
|
282 | x=x
|
283 | y=y
|
284 |
|
285 | # This word
|
286 | $x"${a[@]}"$y
|
287 |
|
288 | # Results in Three frames:
|
289 | [ ('x', False, True), ('1', True, False) ]
|
290 | [ ('2 3', True, False) ]
|
291 | [ ('4', True, False), ('y', False, True) ]
|
292 |
|
293 | Note: A frame is a 3-tuple that's identical to Piece()? Maybe we
|
294 | should make that top level type.
|
295 |
|
296 | TODO:
|
297 | - Instead of List[List[Piece]], where List[Piece] is a Frame
|
298 | - Change this representation to
|
299 | Frames = (List[Piece] pieces, List[int] break_indices)
|
300 | # where break_indices are the end
|
301 |
|
302 | Consider a common case like "$x" or "${x}" - I think this a lot more
|
303 | efficient?
|
304 |
|
305 | And then change _EvalWordFrame(pieces: List[Piece], start: int, end: int)
|
306 | """
|
307 | current = [] # type: List[Piece]
|
308 | frames = [current]
|
309 |
|
310 | for p in part_vals:
|
311 | UP_p = p
|
312 |
|
313 | with tagswitch(p) as case:
|
314 | if case(part_value_e.String):
|
315 | p = cast(Piece, UP_p)
|
316 | current.append(p)
|
317 |
|
318 | elif case(part_value_e.Array):
|
319 | p = cast(part_value.Array, UP_p)
|
320 |
|
321 | is_first = True
|
322 | for s in p.strs:
|
323 | if s is None:
|
324 | continue # ignore undefined array entries
|
325 |
|
326 | # Arrays parts are always quoted; otherwise they would have decayed to
|
327 | # a string.
|
328 | piece = Piece(s, True, False)
|
329 | if is_first:
|
330 | current.append(piece)
|
331 | is_first = False
|
332 | else:
|
333 | current = [piece]
|
334 | frames.append(current) # singleton frame
|
335 |
|
336 | else:
|
337 | raise AssertionError()
|
338 |
|
339 | return frames
|
340 |
|
341 |
|
342 | # TODO: This could be _MakeWordFrames and then sep.join(). It's redundant.
|
343 | def _DecayPartValuesToString(part_vals, join_char):
|
344 | # type: (List[part_value_t], str) -> str
|
345 | # Decay ${a=x"$@"x} to string.
|
346 | out = [] # type: List[str]
|
347 | for p in part_vals:
|
348 | UP_p = p
|
349 | with tagswitch(p) as case:
|
350 | if case(part_value_e.String):
|
351 | p = cast(Piece, UP_p)
|
352 | out.append(p.s)
|
353 | elif case(part_value_e.Array):
|
354 | p = cast(part_value.Array, UP_p)
|
355 | # TODO: Eliminate double join for speed?
|
356 | tmp = [s for s in p.strs if s is not None]
|
357 | out.append(join_char.join(tmp))
|
358 | else:
|
359 | raise AssertionError()
|
360 | return ''.join(out)
|
361 |
|
362 |
|
363 | def _PerformSlice(
|
364 | val, # type: value_t
|
365 | begin, # type: int
|
366 | length, # type: int
|
367 | has_length, # type: bool
|
368 | part, # type: BracedVarSub
|
369 | arg0_val, # type: value.Str
|
370 | ):
|
371 | # type: (...) -> value_t
|
372 | UP_val = val
|
373 | with tagswitch(val) as case:
|
374 | if case(value_e.Str): # Slice UTF-8 characters in a string.
|
375 | val = cast(value.Str, UP_val)
|
376 | s = val.s
|
377 | n = len(s)
|
378 |
|
379 | if begin < 0: # Compute offset with unicode
|
380 | byte_begin = n
|
381 | num_iters = -begin
|
382 | for _ in xrange(num_iters):
|
383 | byte_begin = string_ops.PreviousUtf8Char(s, byte_begin)
|
384 | else:
|
385 | byte_begin = string_ops.AdvanceUtf8Chars(s, begin, 0)
|
386 |
|
387 | if has_length:
|
388 | if length < 0: # Compute offset with unicode
|
389 | # Confusing: this is a POSITION
|
390 | byte_end = n
|
391 | num_iters = -length
|
392 | for _ in xrange(num_iters):
|
393 | byte_end = string_ops.PreviousUtf8Char(s, byte_end)
|
394 | else:
|
395 | byte_end = string_ops.AdvanceUtf8Chars(
|
396 | s, length, byte_begin)
|
397 | else:
|
398 | byte_end = len(s)
|
399 |
|
400 | substr = s[byte_begin:byte_end]
|
401 | result = value.Str(substr) # type: value_t
|
402 |
|
403 | elif case(value_e.BashArray): # Slice array entries.
|
404 | val = cast(value.BashArray, UP_val)
|
405 | # NOTE: This error is ALWAYS fatal in bash. It's inconsistent with
|
406 | # strings.
|
407 | if has_length and length < 0:
|
408 | e_die("Array slice can't have negative length: %d" % length,
|
409 | loc.WordPart(part))
|
410 |
|
411 | # Quirk: "begin" for positional arguments ($@ and $*) counts $0.
|
412 | if arg0_val is not None:
|
413 | orig = [arg0_val.s]
|
414 | orig.extend(val.strs)
|
415 | else:
|
416 | orig = val.strs
|
417 |
|
418 | n = len(orig)
|
419 | if begin < 0:
|
420 | i = n + begin # ${@:-3} starts counts from the end
|
421 | else:
|
422 | i = begin
|
423 | strs = [] # type: List[str]
|
424 | count = 0
|
425 | while i < n:
|
426 | if has_length and count == length: # length could be 0
|
427 | break
|
428 | s = orig[i]
|
429 | if s is not None: # Unset elements don't count towards the length
|
430 | strs.append(s)
|
431 | count += 1
|
432 | i += 1
|
433 |
|
434 | result = value.BashArray(strs)
|
435 |
|
436 | elif case(value_e.BashAssoc):
|
437 | e_die("Can't slice associative arrays", loc.WordPart(part))
|
438 |
|
439 | else:
|
440 | raise error.TypeErr(val, 'Slice op expected Str or BashArray',
|
441 | loc.WordPart(part))
|
442 |
|
443 | return result
|
444 |
|
445 |
|
446 | class StringWordEvaluator(object):
|
447 | """Interface used by ArithEvaluator / BoolEvaluator"""
|
448 |
|
449 | def __init__(self):
|
450 | # type: () -> None
|
451 | """Empty constructor for mycpp."""
|
452 | pass
|
453 |
|
454 | def EvalWordToString(self, w, eval_flags=0):
|
455 | # type: (word_t, int) -> value.Str
|
456 | raise NotImplementedError()
|
457 |
|
458 |
|
459 | def _GetDollarHyphen(exec_opts):
|
460 | # type: (optview.Exec) -> str
|
461 | chars = [] # type: List[str]
|
462 | if exec_opts.interactive():
|
463 | chars.append('i')
|
464 |
|
465 | if exec_opts.errexit():
|
466 | chars.append('e')
|
467 | if exec_opts.noglob():
|
468 | chars.append('f')
|
469 | if exec_opts.noexec():
|
470 | chars.append('n')
|
471 | if exec_opts.nounset():
|
472 | chars.append('u')
|
473 | # NO letter for pipefail?
|
474 | if exec_opts.xtrace():
|
475 | chars.append('x')
|
476 | if exec_opts.noclobber():
|
477 | chars.append('C')
|
478 |
|
479 | # bash has:
|
480 | # - c for sh -c, i for sh -i (mksh also has this)
|
481 | # - h for hashing (mksh also has this)
|
482 | # - B for brace expansion
|
483 | return ''.join(chars)
|
484 |
|
485 |
|
486 | class TildeEvaluator(object):
|
487 |
|
488 | def __init__(self, mem, exec_opts):
|
489 | # type: (Mem, optview.Exec) -> None
|
490 | self.mem = mem
|
491 | self.exec_opts = exec_opts
|
492 |
|
493 | def GetMyHomeDir(self):
|
494 | # type: () -> Optional[str]
|
495 | """Consult $HOME first, and then make a libc call.
|
496 |
|
497 | Important: the libc call can FAIL, which is why we prefer $HOME. See issue
|
498 | #1578.
|
499 | """
|
500 | # First look up the HOME var, then ask the OS. This is what bash does.
|
501 | val = self.mem.GetValue('HOME')
|
502 | UP_val = val
|
503 | if val.tag() == value_e.Str:
|
504 | val = cast(value.Str, UP_val)
|
505 | return val.s
|
506 | return pyos.GetMyHomeDir()
|
507 |
|
508 | def Eval(self, part):
|
509 | # type: (word_part.TildeSub) -> str
|
510 | """Evaluates ~ and ~user, given a Lit_TildeLike token."""
|
511 |
|
512 | if part.user_name is None:
|
513 | result = self.GetMyHomeDir()
|
514 | else:
|
515 | result = pyos.GetHomeDir(part.user_name)
|
516 |
|
517 | if result is None:
|
518 | if self.exec_opts.strict_tilde():
|
519 | e_die("Error expanding tilde (e.g. invalid user)", part.left)
|
520 | else:
|
521 | # Return ~ or ~user literally
|
522 | result = '~'
|
523 | if part.user_name is not None:
|
524 | result = result + part.user_name # mycpp doesn't have +=
|
525 |
|
526 | return result
|
527 |
|
528 |
|
529 | class AbstractWordEvaluator(StringWordEvaluator):
|
530 | """Abstract base class for word evaluators.
|
531 |
|
532 | Public entry points:
|
533 | EvalWordToString EvalForPlugin EvalRhsWord
|
534 | EvalWordSequence EvalWordSequence2
|
535 | """
|
536 |
|
537 | def __init__(
|
538 | self,
|
539 | mem, # type: state.Mem
|
540 | exec_opts, # type: optview.Exec
|
541 | mutable_opts, # type: state.MutableOpts
|
542 | tilde_ev, # type: TildeEvaluator
|
543 | splitter, # type: SplitContext
|
544 | errfmt, # type: ui.ErrorFormatter
|
545 | ):
|
546 | # type: (...) -> None
|
547 | self.arith_ev = None # type: sh_expr_eval.ArithEvaluator
|
548 | self.expr_ev = None # type: expr_eval.ExprEvaluator
|
549 | self.prompt_ev = None # type: prompt.Evaluator
|
550 |
|
551 | self.unsafe_arith = None # type: sh_expr_eval.UnsafeArith
|
552 |
|
553 | self.tilde_ev = tilde_ev
|
554 |
|
555 | self.mem = mem # for $HOME, $1, etc.
|
556 | self.exec_opts = exec_opts # for nounset
|
557 | self.mutable_opts = mutable_opts # for _allow_command_sub
|
558 | self.splitter = splitter
|
559 | self.errfmt = errfmt
|
560 |
|
561 | self.globber = glob_.Globber(exec_opts)
|
562 |
|
563 | def CheckCircularDeps(self):
|
564 | # type: () -> None
|
565 | raise NotImplementedError()
|
566 |
|
567 | def _EvalCommandSub(self, cs_part, quoted):
|
568 | # type: (CommandSub, bool) -> part_value_t
|
569 | """Abstract since it has a side effect."""
|
570 | raise NotImplementedError()
|
571 |
|
572 | def _EvalProcessSub(self, cs_part):
|
573 | # type: (CommandSub) -> part_value_t
|
574 | """Abstract since it has a side effect."""
|
575 | raise NotImplementedError()
|
576 |
|
577 | def _EvalVarNum(self, var_num):
|
578 | # type: (int) -> value_t
|
579 | assert var_num >= 0
|
580 | return self.mem.GetArgNum(var_num)
|
581 |
|
582 | def _EvalSpecialVar(self, op_id, quoted, vsub_state):
|
583 | # type: (int, bool, VarSubState) -> value_t
|
584 | """Evaluate $?
|
585 |
|
586 | and so forth
|
587 | """
|
588 | # $@ is special -- it need to know whether it is in a double quoted
|
589 | # context.
|
590 | #
|
591 | # - If it's $@ in a double quoted context, return an ARRAY.
|
592 | # - If it's $@ in a normal context, return a STRING, which then will be
|
593 | # subject to splitting.
|
594 |
|
595 | if op_id in (Id.VSub_At, Id.VSub_Star):
|
596 | argv = self.mem.GetArgv()
|
597 | val = value.BashArray(argv) # type: value_t
|
598 | if op_id == Id.VSub_At:
|
599 | # "$@" evaluates to an array, $@ should be decayed
|
600 | vsub_state.join_array = not quoted
|
601 | else: # $* "$*" are both decayed
|
602 | vsub_state.join_array = True
|
603 |
|
604 | elif op_id == Id.VSub_Hyphen:
|
605 | val = value.Str(_GetDollarHyphen(self.exec_opts))
|
606 |
|
607 | else:
|
608 | val = self.mem.GetSpecialVar(op_id)
|
609 |
|
610 | return val
|
611 |
|
612 | def _ApplyTestOp(
|
613 | self,
|
614 | val, # type: value_t
|
615 | op, # type: suffix_op.Unary
|
616 | quoted, # type: bool
|
617 | part_vals, # type: Optional[List[part_value_t]]
|
618 | vtest_place, # type: VTestPlace
|
619 | blame_token, # type: Token
|
620 | ):
|
621 | # type: (...) -> bool
|
622 | """
|
623 | Returns:
|
624 | Whether part_vals was mutated
|
625 |
|
626 | ${a:-} returns part_value[]
|
627 | ${a:+} returns part_value[]
|
628 | ${a:?error} returns error word?
|
629 | ${a:=} returns part_value[] but also needs self.mem for side effects.
|
630 |
|
631 | So I guess it should return part_value[], and then a flag for raising an
|
632 | error, and then a flag for assigning it?
|
633 | The original BracedVarSub will have the name.
|
634 |
|
635 | Example of needing multiple part_value[]
|
636 |
|
637 | echo X-${a:-'def'"ault"}-X
|
638 |
|
639 | We return two part values from the BracedVarSub. Also consider:
|
640 |
|
641 | echo ${a:-x"$@"x}
|
642 | """
|
643 | eval_flags = IS_SUBST
|
644 | if quoted:
|
645 | eval_flags |= QUOTED
|
646 |
|
647 | tok = op.op
|
648 | # NOTE: Splicing part_values is necessary because of code like
|
649 | # ${undef:-'a b' c 'd # e'}. Each part_value can have a different
|
650 | # do_glob/do_elide setting.
|
651 | UP_val = val
|
652 | with tagswitch(val) as case:
|
653 | if case(value_e.Undef):
|
654 | is_falsey = True
|
655 |
|
656 | elif case(value_e.Str):
|
657 | val = cast(value.Str, UP_val)
|
658 | if tok.id in (Id.VTest_ColonHyphen, Id.VTest_ColonEquals,
|
659 | Id.VTest_ColonQMark, Id.VTest_ColonPlus):
|
660 | is_falsey = len(val.s) == 0
|
661 | else:
|
662 | is_falsey = False
|
663 |
|
664 | elif case(value_e.BashArray):
|
665 | val = cast(value.BashArray, UP_val)
|
666 | # TODO: allow undefined
|
667 | is_falsey = len(val.strs) == 0
|
668 |
|
669 | elif case(value_e.BashAssoc):
|
670 | val = cast(value.BashAssoc, UP_val)
|
671 | is_falsey = len(val.d) == 0
|
672 |
|
673 | else:
|
674 | # value.Eggex, etc. are all false
|
675 | is_falsey = False
|
676 |
|
677 | if tok.id in (Id.VTest_ColonHyphen, Id.VTest_Hyphen):
|
678 | if is_falsey:
|
679 | self._EvalRhsWordToParts(op.arg_word, part_vals, eval_flags)
|
680 | return True
|
681 | else:
|
682 | return False
|
683 |
|
684 | # Inverse of the above.
|
685 | elif tok.id in (Id.VTest_ColonPlus, Id.VTest_Plus):
|
686 | if is_falsey:
|
687 | return False
|
688 | else:
|
689 | self._EvalRhsWordToParts(op.arg_word, part_vals, eval_flags)
|
690 | return True
|
691 |
|
692 | # Splice and assign
|
693 | elif tok.id in (Id.VTest_ColonEquals, Id.VTest_Equals):
|
694 | if is_falsey:
|
695 | # Collect new part vals.
|
696 | assign_part_vals = [] # type: List[part_value_t]
|
697 | self._EvalRhsWordToParts(op.arg_word, assign_part_vals,
|
698 | eval_flags)
|
699 | # Append them to out param AND return them.
|
700 | part_vals.extend(assign_part_vals)
|
701 |
|
702 | if vtest_place.name is None:
|
703 | # TODO: error context
|
704 | e_die("Can't assign to special variable")
|
705 | else:
|
706 | # NOTE: This decays arrays too! 'shopt -s strict_array' could
|
707 | # avoid it.
|
708 | rhs_str = _DecayPartValuesToString(
|
709 | assign_part_vals, self.splitter.GetJoinChar())
|
710 | if vtest_place.index is None: # using None when no index
|
711 | lval = location.LName(
|
712 | vtest_place.name) # type: sh_lvalue_t
|
713 | else:
|
714 | var_name = vtest_place.name
|
715 | var_index = vtest_place.index
|
716 | UP_var_index = var_index
|
717 |
|
718 | with tagswitch(var_index) as case:
|
719 | if case(a_index_e.Int):
|
720 | var_index = cast(a_index.Int, UP_var_index)
|
721 | lval = sh_lvalue.Indexed(
|
722 | var_name, var_index.i, loc.Missing)
|
723 | elif case(a_index_e.Str):
|
724 | var_index = cast(a_index.Str, UP_var_index)
|
725 | lval = sh_lvalue.Keyed(var_name, var_index.s,
|
726 | loc.Missing)
|
727 | else:
|
728 | raise AssertionError()
|
729 |
|
730 | state.OshLanguageSetValue(self.mem, lval,
|
731 | value.Str(rhs_str))
|
732 | return True
|
733 |
|
734 | else:
|
735 | return False
|
736 |
|
737 | elif tok.id in (Id.VTest_ColonQMark, Id.VTest_QMark):
|
738 | if is_falsey:
|
739 | # The arg is the error message
|
740 | error_part_vals = [] # type: List[part_value_t]
|
741 | self._EvalRhsWordToParts(op.arg_word, error_part_vals,
|
742 | eval_flags)
|
743 | error_str = _DecayPartValuesToString(
|
744 | error_part_vals, self.splitter.GetJoinChar())
|
745 |
|
746 | #
|
747 | # Display fancy/helpful error
|
748 | #
|
749 | if vtest_place.name is None:
|
750 | var_name = '???'
|
751 | else:
|
752 | var_name = vtest_place.name
|
753 |
|
754 | if 0:
|
755 | # This hint is nice, but looks too noisy for now
|
756 | op_str = lexer.LazyStr(tok)
|
757 | if tok.id == Id.VTest_ColonQMark:
|
758 | why = 'empty or unset'
|
759 | else:
|
760 | why = 'unset'
|
761 |
|
762 | self.errfmt.Print_(
|
763 | "Hint: operator %s means a variable can't be %s" %
|
764 | (op_str, why), tok)
|
765 |
|
766 | if val.tag() == value_e.Undef:
|
767 | actual = 'unset'
|
768 | else:
|
769 | actual = 'empty'
|
770 |
|
771 | if len(error_str):
|
772 | suffix = ': %r' % error_str
|
773 | else:
|
774 | suffix = ''
|
775 | e_die("Var %s is %s%s" % (var_name, actual, suffix),
|
776 | blame_token)
|
777 |
|
778 | else:
|
779 | return False
|
780 |
|
781 | else:
|
782 | raise AssertionError(tok.id)
|
783 |
|
784 | def _Length(self, val, token):
|
785 | # type: (value_t, Token) -> int
|
786 | """Returns the length of the value, for ${#var}"""
|
787 | UP_val = val
|
788 | with tagswitch(val) as case:
|
789 | if case(value_e.Str):
|
790 | val = cast(value.Str, UP_val)
|
791 | # NOTE: Whether bash counts bytes or chars is affected by LANG
|
792 | # environment variables.
|
793 | # Should we respect that, or another way to select? set -o
|
794 | # count-bytes?
|
795 |
|
796 | # https://stackoverflow.com/questions/17368067/length-of-string-in-bash
|
797 | try:
|
798 | length = string_ops.CountUtf8Chars(val.s)
|
799 | except error.Strict as e:
|
800 | # Add this here so we don't have to add it so far down the stack.
|
801 | # TODO: It's better to show BOTH this CODE an the actual DATA
|
802 | # somehow.
|
803 | e.location = token
|
804 |
|
805 | if self.exec_opts.strict_word_eval():
|
806 | raise
|
807 | else:
|
808 | # NOTE: Doesn't make the command exit with 1; it just returns a
|
809 | # length of -1.
|
810 | self.errfmt.PrettyPrintError(e, prefix='warning: ')
|
811 | return -1
|
812 |
|
813 | elif case(value_e.BashArray):
|
814 | val = cast(value.BashArray, UP_val)
|
815 | # There can be empty placeholder values in the array.
|
816 | length = 0
|
817 | for s in val.strs:
|
818 | if s is not None:
|
819 | length += 1
|
820 |
|
821 | elif case(value_e.BashAssoc):
|
822 | val = cast(value.BashAssoc, UP_val)
|
823 | length = len(val.d)
|
824 |
|
825 | else:
|
826 | raise error.TypeErr(
|
827 | val, "Length op expected Str, BashArray, BashAssoc", token)
|
828 |
|
829 | return length
|
830 |
|
831 | def _Keys(self, val, token):
|
832 | # type: (value_t, Token) -> value_t
|
833 | """Return keys of a container, for ${!array[@]}"""
|
834 |
|
835 | UP_val = val
|
836 | with tagswitch(val) as case:
|
837 | if case(value_e.BashArray):
|
838 | val = cast(value.BashArray, UP_val)
|
839 | # translation issue: tuple indices not supported in list comprehensions
|
840 | #indices = [str(i) for i, s in enumerate(val.strs) if s is not None]
|
841 | indices = [] # type: List[str]
|
842 | for i, s in enumerate(val.strs):
|
843 | if s is not None:
|
844 | indices.append(str(i))
|
845 | return value.BashArray(indices)
|
846 |
|
847 | elif case(value_e.BashAssoc):
|
848 | val = cast(value.BashAssoc, UP_val)
|
849 | assert val.d is not None # for MyPy, so it's not Optional[]
|
850 |
|
851 | # BUG: Keys aren't ordered according to insertion!
|
852 | return value.BashArray(val.d.keys())
|
853 |
|
854 | else:
|
855 | raise error.TypeErr(val, 'Keys op expected Str', token)
|
856 |
|
857 | def _EvalVarRef(self, val, blame_tok, quoted, vsub_state, vtest_place):
|
858 | # type: (value_t, Token, bool, VarSubState, VTestPlace) -> value_t
|
859 | """Handles indirect expansion like ${!var} and ${!a[0]}.
|
860 |
|
861 | Args:
|
862 | blame_tok: 'foo' for ${!foo}
|
863 | """
|
864 | UP_val = val
|
865 | with tagswitch(val) as case:
|
866 | if case(value_e.Undef):
|
867 | return value.Undef # ${!undef} is just weird bash behavior
|
868 |
|
869 | elif case(value_e.Str):
|
870 | val = cast(value.Str, UP_val)
|
871 | bvs_part = self.unsafe_arith.ParseVarRef(val.s, blame_tok)
|
872 | return self._VarRefValue(bvs_part, quoted, vsub_state,
|
873 | vtest_place)
|
874 |
|
875 | elif case(value_e.BashArray): # caught earlier but OK
|
876 | e_die('Indirect expansion of array')
|
877 |
|
878 | elif case(value_e.BashAssoc): # caught earlier but OK
|
879 | e_die('Indirect expansion of assoc array')
|
880 |
|
881 | else:
|
882 | raise error.TypeErr(val, 'Var Ref op expected Str', blame_tok)
|
883 |
|
884 | def _ApplyUnarySuffixOp(self, val, op):
|
885 | # type: (value_t, suffix_op.Unary) -> value_t
|
886 | assert val.tag() != value_e.Undef
|
887 |
|
888 | op_kind = consts.GetKind(op.op.id)
|
889 |
|
890 | if op_kind == Kind.VOp1:
|
891 | # NOTE: glob syntax is supported in ^ ^^ , ,, ! As well as % %% # ##.
|
892 | # Detect has_extglob so that DoUnarySuffixOp doesn't use the fast
|
893 | # shortcut for constant strings.
|
894 | arg_val, has_extglob = self.EvalWordToPattern(op.arg_word)
|
895 | assert arg_val.tag() == value_e.Str
|
896 |
|
897 | UP_val = val
|
898 | with tagswitch(val) as case:
|
899 | if case(value_e.Str):
|
900 | val = cast(value.Str, UP_val)
|
901 | s = string_ops.DoUnarySuffixOp(val.s, op.op, arg_val.s,
|
902 | has_extglob)
|
903 | #log('%r %r -> %r', val.s, arg_val.s, s)
|
904 | new_val = value.Str(s) # type: value_t
|
905 |
|
906 | elif case(value_e.BashArray):
|
907 | val = cast(value.BashArray, UP_val)
|
908 | # ${a[@]#prefix} is VECTORIZED on arrays. YSH should have this too.
|
909 | strs = [] # type: List[str]
|
910 | for s in val.strs:
|
911 | if s is not None:
|
912 | strs.append(
|
913 | string_ops.DoUnarySuffixOp(
|
914 | s, op.op, arg_val.s, has_extglob))
|
915 | new_val = value.BashArray(strs)
|
916 |
|
917 | elif case(value_e.BashAssoc):
|
918 | val = cast(value.BashAssoc, UP_val)
|
919 | strs = []
|
920 | for s in val.d.values():
|
921 | strs.append(
|
922 | string_ops.DoUnarySuffixOp(s, op.op, arg_val.s,
|
923 | has_extglob))
|
924 | new_val = value.BashArray(strs)
|
925 |
|
926 | else:
|
927 | raise error.TypeErr(
|
928 | val, 'Unary op expected Str, BashArray, BashAssoc',
|
929 | op.op)
|
930 |
|
931 | else:
|
932 | raise AssertionError(Kind_str(op_kind))
|
933 |
|
934 | return new_val
|
935 |
|
936 | def _PatSub(self, val, op):
|
937 | # type: (value_t, suffix_op.PatSub) -> value_t
|
938 |
|
939 | pat_val, has_extglob = self.EvalWordToPattern(op.pat)
|
940 | # Extended globs aren't supported because we only translate * ? etc. to
|
941 | # ERE. I don't think there's a straightforward translation from !(*.py) to
|
942 | # ERE! You would need an engine that supports negation? (Derivatives?)
|
943 | if has_extglob:
|
944 | e_die('extended globs not supported in ${x//GLOB/}', op.pat)
|
945 |
|
946 | if op.replace:
|
947 | replace_val = self.EvalRhsWord(op.replace)
|
948 | # Can't have an array, so must be a string
|
949 | assert replace_val.tag() == value_e.Str, replace_val
|
950 | replace_str = cast(value.Str, replace_val).s
|
951 | else:
|
952 | replace_str = ''
|
953 |
|
954 | # note: doesn't support self.exec_opts.extglob()!
|
955 | regex, warnings = glob_.GlobToERE(pat_val.s)
|
956 | if len(warnings):
|
957 | # TODO:
|
958 | # - Add 'shopt -s strict_glob' mode and expose warnings.
|
959 | # "Glob is not in CANONICAL FORM".
|
960 | # - Propagate location info back to the 'op.pat' word.
|
961 | pass
|
962 | #log('regex %r', regex)
|
963 | replacer = string_ops.GlobReplacer(regex, replace_str, op.slash_tok)
|
964 |
|
965 | with tagswitch(val) as case2:
|
966 | if case2(value_e.Str):
|
967 | str_val = cast(value.Str, val)
|
968 | s = replacer.Replace(str_val.s, op)
|
969 | val = value.Str(s)
|
970 |
|
971 | elif case2(value_e.BashArray):
|
972 | array_val = cast(value.BashArray, val)
|
973 | strs = [] # type: List[str]
|
974 | for s in array_val.strs:
|
975 | if s is not None:
|
976 | strs.append(replacer.Replace(s, op))
|
977 | val = value.BashArray(strs)
|
978 |
|
979 | elif case2(value_e.BashAssoc):
|
980 | assoc_val = cast(value.BashAssoc, val)
|
981 | strs = []
|
982 | for s in assoc_val.d.values():
|
983 | strs.append(replacer.Replace(s, op))
|
984 | val = value.BashArray(strs)
|
985 |
|
986 | else:
|
987 | raise error.TypeErr(
|
988 | val, 'Pat Sub op expected Str, BashArray, BashAssoc',
|
989 | op.slash_tok)
|
990 |
|
991 | return val
|
992 |
|
993 | def _Slice(self, val, op, var_name, part):
|
994 | # type: (value_t, suffix_op.Slice, Optional[str], BracedVarSub) -> value_t
|
995 |
|
996 | begin = self.arith_ev.EvalToInt(op.begin)
|
997 |
|
998 | # Note: bash allows lengths to be negative (with odd semantics), but
|
999 | # we don't allow that right now.
|
1000 | has_length = False
|
1001 | length = -1
|
1002 | if op.length:
|
1003 | has_length = True
|
1004 | length = self.arith_ev.EvalToInt(op.length)
|
1005 |
|
1006 | try:
|
1007 | arg0_val = None # type: value.Str
|
1008 | if var_name is None: # $* or $@
|
1009 | arg0_val = self.mem.GetArg0()
|
1010 | val = _PerformSlice(val, begin, length, has_length, part, arg0_val)
|
1011 | except error.Strict as e:
|
1012 | if self.exec_opts.strict_word_eval():
|
1013 | raise
|
1014 | else:
|
1015 | self.errfmt.PrettyPrintError(e, prefix='warning: ')
|
1016 | with tagswitch(val) as case2:
|
1017 | if case2(value_e.Str):
|
1018 | val = value.Str('')
|
1019 | elif case2(value_e.BashArray):
|
1020 | val = value.BashArray([])
|
1021 | else:
|
1022 | raise NotImplementedError()
|
1023 | return val
|
1024 |
|
1025 | def _Nullary(self, val, op, var_name):
|
1026 | # type: (value_t, Token, Optional[str]) -> Tuple[value.Str, bool]
|
1027 |
|
1028 | UP_val = val
|
1029 | quoted2 = False
|
1030 | op_id = op.id
|
1031 | if op_id == Id.VOp0_P:
|
1032 | with tagswitch(val) as case:
|
1033 | if case(value_e.Str):
|
1034 | str_val = cast(value.Str, UP_val)
|
1035 | prompt = self.prompt_ev.EvalPrompt(str_val)
|
1036 | # readline gets rid of these, so we should too.
|
1037 | p = prompt.replace('\x01', '').replace('\x02', '')
|
1038 | result = value.Str(p)
|
1039 | else:
|
1040 | e_die("Can't use @P on %s" % ui.ValType(val), op)
|
1041 |
|
1042 | elif op_id == Id.VOp0_Q:
|
1043 | with tagswitch(val) as case:
|
1044 | if case(value_e.Str):
|
1045 | str_val = cast(value.Str, UP_val)
|
1046 |
|
1047 | # TODO: use fastfunc.ShellEncode or
|
1048 | # fastfunc.PosixShellEncode()
|
1049 | result = value.Str(j8_lite.MaybeShellEncode(str_val.s))
|
1050 | # oddly, 'echo ${x@Q}' is equivalent to 'echo "${x@Q}"' in bash
|
1051 | quoted2 = True
|
1052 | elif case(value_e.BashArray):
|
1053 | array_val = cast(value.BashArray, UP_val)
|
1054 |
|
1055 | # TODO: should use fastfunc.ShellEncode
|
1056 | tmp = [j8_lite.MaybeShellEncode(s) for s in array_val.strs]
|
1057 | result = value.Str(' '.join(tmp))
|
1058 | else:
|
1059 | e_die("Can't use @Q on %s" % ui.ValType(val), op)
|
1060 |
|
1061 | elif op_id == Id.VOp0_a:
|
1062 | # We're ONLY simluating -a and -A, not -r -x -n for now. See
|
1063 | # spec/ble-idioms.test.sh.
|
1064 | chars = [] # type: List[str]
|
1065 | with tagswitch(val) as case:
|
1066 | if case(value_e.BashArray):
|
1067 | chars.append('a')
|
1068 | elif case(value_e.BashAssoc):
|
1069 | chars.append('A')
|
1070 |
|
1071 | if var_name is not None: # e.g. ${?@a} is allowed
|
1072 | cell = self.mem.GetCell(var_name)
|
1073 | if cell:
|
1074 | if cell.readonly:
|
1075 | chars.append('r')
|
1076 | if cell.exported:
|
1077 | chars.append('x')
|
1078 | if cell.nameref:
|
1079 | chars.append('n')
|
1080 |
|
1081 | result = value.Str(''.join(chars))
|
1082 |
|
1083 | else:
|
1084 | e_die('Var op %r not implemented' % lexer.TokenVal(op), op)
|
1085 |
|
1086 | return result, quoted2
|
1087 |
|
1088 | def _WholeArray(self, val, part, quoted, vsub_state):
|
1089 | # type: (value_t, BracedVarSub, bool, VarSubState) -> value_t
|
1090 | op_id = cast(bracket_op.WholeArray, part.bracket_op).op_id
|
1091 |
|
1092 | if op_id == Id.Lit_At:
|
1093 | vsub_state.join_array = not quoted # ${a[@]} decays but "${a[@]}" doesn't
|
1094 | UP_val = val
|
1095 | with tagswitch(val) as case2:
|
1096 | if case2(value_e.Undef):
|
1097 | if not vsub_state.has_test_op:
|
1098 | val = self._EmptyBashArrayOrError(part.token)
|
1099 | elif case2(value_e.Str):
|
1100 | if self.exec_opts.strict_array():
|
1101 | e_die("Can't index string with @", loc.WordPart(part))
|
1102 | elif case2(value_e.BashArray):
|
1103 | pass # no-op
|
1104 |
|
1105 | elif op_id == Id.Arith_Star:
|
1106 | vsub_state.join_array = True # both ${a[*]} and "${a[*]}" decay
|
1107 | UP_val = val
|
1108 | with tagswitch(val) as case2:
|
1109 | if case2(value_e.Undef):
|
1110 | if not vsub_state.has_test_op:
|
1111 | val = self._EmptyBashArrayOrError(part.token)
|
1112 | elif case2(value_e.Str):
|
1113 | if self.exec_opts.strict_array():
|
1114 | e_die("Can't index string with *", loc.WordPart(part))
|
1115 | elif case2(value_e.BashArray):
|
1116 | pass # no-op
|
1117 |
|
1118 | else:
|
1119 | raise AssertionError(op_id) # unknown
|
1120 |
|
1121 | return val
|
1122 |
|
1123 | def _ArrayIndex(self, val, part, vtest_place):
|
1124 | # type: (value_t, BracedVarSub, VTestPlace) -> value_t
|
1125 | """Process a numeric array index like ${a[i+1]}"""
|
1126 | anode = cast(bracket_op.ArrayIndex, part.bracket_op).expr
|
1127 |
|
1128 | UP_val = val
|
1129 | with tagswitch(val) as case2:
|
1130 | if case2(value_e.Undef):
|
1131 | pass # it will be checked later
|
1132 |
|
1133 | elif case2(value_e.Str):
|
1134 | # Bash treats any string as an array, so we can't add our own
|
1135 | # behavior here without making valid OSH invalid bash.
|
1136 | e_die("Can't index string %r with integer" % part.var_name,
|
1137 | part.token)
|
1138 |
|
1139 | elif case2(value_e.BashArray):
|
1140 | array_val = cast(value.BashArray, UP_val)
|
1141 | index = self.arith_ev.EvalToInt(anode)
|
1142 | vtest_place.index = a_index.Int(index)
|
1143 |
|
1144 | s = GetArrayItem(array_val.strs, index)
|
1145 |
|
1146 | if s is None:
|
1147 | val = value.Undef
|
1148 | else:
|
1149 | val = value.Str(s)
|
1150 |
|
1151 | elif case2(value_e.BashAssoc):
|
1152 | assoc_val = cast(value.BashAssoc, UP_val)
|
1153 | # Location could also be attached to bracket_op? But
|
1154 | # arith_expr.VarSub works OK too
|
1155 | key = self.arith_ev.EvalWordToString(
|
1156 | anode, blame_loc=location.TokenForArith(anode))
|
1157 |
|
1158 | vtest_place.index = a_index.Str(key) # out param
|
1159 | s = assoc_val.d.get(key)
|
1160 |
|
1161 | if s is None:
|
1162 | val = value.Undef
|
1163 | else:
|
1164 | val = value.Str(s)
|
1165 |
|
1166 | else:
|
1167 | raise error.TypeErr(val,
|
1168 | 'Index op expected BashArray, BashAssoc',
|
1169 | loc.WordPart(part))
|
1170 |
|
1171 | return val
|
1172 |
|
1173 | def _EvalDoubleQuoted(self, parts, part_vals):
|
1174 | # type: (List[word_part_t], List[part_value_t]) -> None
|
1175 | """Evaluate parts of a DoubleQuoted part.
|
1176 |
|
1177 | Args:
|
1178 | part_vals: output param to append to.
|
1179 | """
|
1180 | # Example of returning array:
|
1181 | # $ a=(1 2); b=(3); $ c=(4 5)
|
1182 | # $ argv "${a[@]}${b[@]}${c[@]}"
|
1183 | # ['1', '234', '5']
|
1184 | #
|
1185 | # Example of multiple parts
|
1186 | # $ argv "${a[@]}${undef[@]:-${c[@]}}"
|
1187 | # ['1', '24', '5']
|
1188 |
|
1189 | # Special case for "". The parser outputs (DoubleQuoted []), instead
|
1190 | # of (DoubleQuoted [Literal '']). This is better but it means we
|
1191 | # have to check for it.
|
1192 | if len(parts) == 0:
|
1193 | v = Piece('', True, False)
|
1194 | part_vals.append(v)
|
1195 | return
|
1196 |
|
1197 | for p in parts:
|
1198 | self._EvalWordPart(p, part_vals, QUOTED)
|
1199 |
|
1200 | def EvalDoubleQuotedToString(self, dq_part):
|
1201 | # type: (DoubleQuoted) -> str
|
1202 | """For double quoted strings in YSH expressions.
|
1203 |
|
1204 | Example: var x = "$foo-${foo}"
|
1205 | """
|
1206 | part_vals = [] # type: List[part_value_t]
|
1207 | self._EvalDoubleQuoted(dq_part.parts, part_vals)
|
1208 | return self._ConcatPartVals(part_vals, dq_part.left)
|
1209 |
|
1210 | def _DecayArray(self, val):
|
1211 | # type: (value.BashArray) -> value.Str
|
1212 | """Decay $* to a string."""
|
1213 | assert val.tag() == value_e.BashArray, val
|
1214 | sep = self.splitter.GetJoinChar()
|
1215 | tmp = [s for s in val.strs if s is not None]
|
1216 | return value.Str(sep.join(tmp))
|
1217 |
|
1218 | def _EmptyStrOrError(self, val, token):
|
1219 | # type: (value_t, Token) -> value_t
|
1220 | if val.tag() != value_e.Undef:
|
1221 | return val
|
1222 |
|
1223 | if not self.exec_opts.nounset():
|
1224 | return value.Str('')
|
1225 |
|
1226 | tok_str = lexer.TokenVal(token)
|
1227 | name = tok_str[1:] if tok_str.startswith('$') else tok_str
|
1228 | e_die('Undefined variable %r' % name, token)
|
1229 |
|
1230 | def _EmptyBashArrayOrError(self, token):
|
1231 | # type: (Token) -> value_t
|
1232 | assert token is not None
|
1233 | if self.exec_opts.nounset():
|
1234 | e_die('Undefined array %r' % lexer.TokenVal(token), token)
|
1235 | else:
|
1236 | return value.BashArray([])
|
1237 |
|
1238 | def _EvalBracketOp(self, val, part, quoted, vsub_state, vtest_place):
|
1239 | # type: (value_t, BracedVarSub, bool, VarSubState, VTestPlace) -> value_t
|
1240 |
|
1241 | if part.bracket_op:
|
1242 | with tagswitch(part.bracket_op) as case:
|
1243 | if case(bracket_op_e.WholeArray):
|
1244 | val = self._WholeArray(val, part, quoted, vsub_state)
|
1245 |
|
1246 | elif case(bracket_op_e.ArrayIndex):
|
1247 | val = self._ArrayIndex(val, part, vtest_place)
|
1248 |
|
1249 | else:
|
1250 | raise AssertionError(part.bracket_op.tag())
|
1251 |
|
1252 | else: # no bracket op
|
1253 | var_name = vtest_place.name
|
1254 | if (var_name is not None and
|
1255 | val.tag() in (value_e.BashArray, value_e.BashAssoc) and
|
1256 | not vsub_state.is_type_query):
|
1257 | if ShouldArrayDecay(var_name, self.exec_opts,
|
1258 | not (part.prefix_op or part.suffix_op)):
|
1259 | # for ${BASH_SOURCE}, etc.
|
1260 | val = DecayArray(val)
|
1261 | else:
|
1262 | e_die(
|
1263 | "Array %r can't be referred to as a scalar (without @ or *)"
|
1264 | % var_name, loc.WordPart(part))
|
1265 |
|
1266 | return val
|
1267 |
|
1268 | def _VarRefValue(self, part, quoted, vsub_state, vtest_place):
|
1269 | # type: (BracedVarSub, bool, VarSubState, VTestPlace) -> value_t
|
1270 | """Duplicates some logic from _EvalBracedVarSub, but returns a
|
1271 | value_t."""
|
1272 |
|
1273 | # 1. Evaluate from (var_name, var_num, token Id) -> value
|
1274 | if part.token.id == Id.VSub_Name:
|
1275 | vtest_place.name = part.var_name
|
1276 | val = self.mem.GetValue(part.var_name)
|
1277 |
|
1278 | elif part.token.id == Id.VSub_Number:
|
1279 | var_num = int(part.var_name)
|
1280 | val = self._EvalVarNum(var_num)
|
1281 |
|
1282 | else:
|
1283 | # $* decays
|
1284 | val = self._EvalSpecialVar(part.token.id, quoted, vsub_state)
|
1285 |
|
1286 | # We don't need var_index because it's only for L-Values of test ops?
|
1287 | if self.exec_opts.eval_unsafe_arith():
|
1288 | val = self._EvalBracketOp(val, part, quoted, vsub_state,
|
1289 | vtest_place)
|
1290 | else:
|
1291 | with state.ctx_Option(self.mutable_opts,
|
1292 | [option_i._allow_command_sub], False):
|
1293 | val = self._EvalBracketOp(val, part, quoted, vsub_state,
|
1294 | vtest_place)
|
1295 |
|
1296 | return val
|
1297 |
|
1298 | def _EvalBracedVarSub(self, part, part_vals, quoted):
|
1299 | # type: (BracedVarSub, List[part_value_t], bool) -> None
|
1300 | """
|
1301 | Args:
|
1302 | part_vals: output param to append to.
|
1303 | """
|
1304 | # We have different operators that interact in a non-obvious order.
|
1305 | #
|
1306 | # 1. bracket_op: value -> value, with side effect on vsub_state
|
1307 | #
|
1308 | # 2. prefix_op
|
1309 | # a. length ${#x}: value -> value
|
1310 | # b. var ref ${!ref}: can expand to an array
|
1311 | #
|
1312 | # 3. suffix_op:
|
1313 | # a. no operator: you have a value
|
1314 | # b. Test: value -> part_value[]
|
1315 | # c. Other Suffix: value -> value
|
1316 | #
|
1317 | # 4. Process vsub_state.join_array here before returning.
|
1318 | #
|
1319 | # These cases are hard to distinguish:
|
1320 | # - ${!prefix@} prefix query
|
1321 | # - ${!array[@]} keys
|
1322 | # - ${!ref} named reference
|
1323 | # - ${!ref[0]} named reference
|
1324 | #
|
1325 | # I think we need several stages:
|
1326 | #
|
1327 | # 1. value: name, number, special, prefix query
|
1328 | # 2. bracket_op
|
1329 | # 3. prefix length -- this is TERMINAL
|
1330 | # 4. indirection? Only for some of the ! cases
|
1331 | # 5. string transformation suffix ops like ##
|
1332 | # 6. test op
|
1333 | # 7. vsub_state.join_array
|
1334 |
|
1335 | # vsub_state.join_array is for joining "${a[*]}" and unquoted ${a[@]} AFTER
|
1336 | # suffix ops are applied. If we take the length with a prefix op, the
|
1337 | # distinction is ignored.
|
1338 |
|
1339 | var_name = None # type: Optional[str] # used throughout the function
|
1340 | vtest_place = VTestPlace(var_name, None) # For ${foo=default}
|
1341 | vsub_state = VarSubState.CreateNull() # for $*, ${a[*]}, etc.
|
1342 |
|
1343 | # 1. Evaluate from (var_name, var_num, token Id) -> value
|
1344 | if part.token.id == Id.VSub_Name:
|
1345 | # Handle ${!prefix@} first, since that looks at names and not values
|
1346 | # Do NOT handle ${!A[@]@a} here!
|
1347 | if (part.prefix_op is not None and part.bracket_op is None and
|
1348 | part.suffix_op is not None and
|
1349 | part.suffix_op.tag() == suffix_op_e.Nullary):
|
1350 | nullary_op = cast(Token, part.suffix_op)
|
1351 | # ${!x@} but not ${!x@P}
|
1352 | if consts.GetKind(nullary_op.id) == Kind.VOp3:
|
1353 | names = self.mem.VarNamesStartingWith(part.var_name)
|
1354 | names.sort()
|
1355 |
|
1356 | if quoted and nullary_op.id == Id.VOp3_At:
|
1357 | part_vals.append(part_value.Array(names))
|
1358 | else:
|
1359 | sep = self.splitter.GetJoinChar()
|
1360 | part_vals.append(Piece(sep.join(names), quoted, True))
|
1361 | return # EARLY RETURN
|
1362 |
|
1363 | var_name = part.var_name
|
1364 | vtest_place.name = var_name # for _ApplyTestOp
|
1365 |
|
1366 | val = self.mem.GetValue(var_name)
|
1367 |
|
1368 | elif part.token.id == Id.VSub_Number:
|
1369 | var_num = int(part.var_name)
|
1370 | val = self._EvalVarNum(var_num)
|
1371 | else:
|
1372 | # $* decays
|
1373 | val = self._EvalSpecialVar(part.token.id, quoted, vsub_state)
|
1374 |
|
1375 | suffix_op_ = part.suffix_op
|
1376 | if suffix_op_:
|
1377 | UP_op = suffix_op_
|
1378 | with tagswitch(suffix_op_) as case:
|
1379 | if case(suffix_op_e.Nullary):
|
1380 | suffix_op_ = cast(Token, UP_op)
|
1381 |
|
1382 | # Type query ${array@a} is a STRING, not an array
|
1383 | # NOTE: ${array@Q} is ${array[0]@Q} in bash, which is different than
|
1384 | # ${array[@]@Q}
|
1385 | if suffix_op_.id == Id.VOp0_a:
|
1386 | vsub_state.is_type_query = True
|
1387 |
|
1388 | elif case(suffix_op_e.Unary):
|
1389 | suffix_op_ = cast(suffix_op.Unary, UP_op)
|
1390 |
|
1391 | # Do the _EmptyStrOrError/_EmptyBashArrayOrError up front, EXCEPT in
|
1392 | # the case of Kind.VTest
|
1393 | if consts.GetKind(suffix_op_.op.id) == Kind.VTest:
|
1394 | vsub_state.has_test_op = True
|
1395 |
|
1396 | # 2. Bracket Op
|
1397 | val = self._EvalBracketOp(val, part, quoted, vsub_state, vtest_place)
|
1398 |
|
1399 | if part.prefix_op:
|
1400 | if part.prefix_op.id == Id.VSub_Pound: # ${#var} for length
|
1401 | if not vsub_state.has_test_op: # undef -> '' BEFORE length
|
1402 | val = self._EmptyStrOrError(val, part.token)
|
1403 |
|
1404 | n = self._Length(val, part.token)
|
1405 | part_vals.append(Piece(str(n), quoted, False))
|
1406 | return # EARLY EXIT: nothing else can come after length
|
1407 |
|
1408 | elif part.prefix_op.id == Id.VSub_Bang:
|
1409 | if (part.bracket_op and
|
1410 | part.bracket_op.tag() == bracket_op_e.WholeArray):
|
1411 | if vsub_state.has_test_op:
|
1412 | # ${!a[@]-'default'} is a non-fatal runtime error in bash. Here
|
1413 | # it's fatal.
|
1414 | op_tok = cast(suffix_op.Unary, UP_op).op
|
1415 | e_die('Test operation not allowed with ${!array[@]}',
|
1416 | op_tok)
|
1417 |
|
1418 | # ${!array[@]} to get indices/keys
|
1419 | val = self._Keys(val, part.token)
|
1420 | # already set vsub_State.join_array ABOVE
|
1421 | else:
|
1422 | # Process ${!ref}. SURPRISE: ${!a[0]} is an indirect expansion unlike
|
1423 | # ${!a[@]} !
|
1424 | # ${!ref} can expand into an array if ref='array[@]'
|
1425 |
|
1426 | # Clear it now that we have a var ref
|
1427 | vtest_place.name = None
|
1428 | vtest_place.index = None
|
1429 |
|
1430 | val = self._EvalVarRef(val, part.token, quoted, vsub_state,
|
1431 | vtest_place)
|
1432 |
|
1433 | if not vsub_state.has_test_op: # undef -> '' AFTER indirection
|
1434 | val = self._EmptyStrOrError(val, part.token)
|
1435 |
|
1436 | else:
|
1437 | raise AssertionError(part.prefix_op)
|
1438 |
|
1439 | else:
|
1440 | if not vsub_state.has_test_op: # undef -> '' if no prefix op
|
1441 | val = self._EmptyStrOrError(val, part.token)
|
1442 |
|
1443 | quoted2 = False # another bit for @Q
|
1444 | if suffix_op_:
|
1445 | op = suffix_op_ # could get rid of this alias
|
1446 |
|
1447 | with tagswitch(suffix_op_) as case:
|
1448 | if case(suffix_op_e.Nullary):
|
1449 | op = cast(Token, UP_op)
|
1450 | val, quoted2 = self._Nullary(val, op, var_name)
|
1451 |
|
1452 | elif case(suffix_op_e.Unary):
|
1453 | op = cast(suffix_op.Unary, UP_op)
|
1454 | if consts.GetKind(op.op.id) == Kind.VTest:
|
1455 | if self._ApplyTestOp(val, op, quoted, part_vals,
|
1456 | vtest_place, part.token):
|
1457 | # e.g. to evaluate ${undef:-'default'}, we already appended
|
1458 | # what we need
|
1459 | return
|
1460 |
|
1461 | else:
|
1462 | # Other suffix: value -> value
|
1463 | val = self._ApplyUnarySuffixOp(val, op)
|
1464 |
|
1465 | elif case(suffix_op_e.PatSub): # PatSub, vectorized
|
1466 | op = cast(suffix_op.PatSub, UP_op)
|
1467 | val = self._PatSub(val, op)
|
1468 |
|
1469 | elif case(suffix_op_e.Slice):
|
1470 | op = cast(suffix_op.Slice, UP_op)
|
1471 | val = self._Slice(val, op, var_name, part)
|
1472 |
|
1473 | elif case(suffix_op_e.Static):
|
1474 | op = cast(suffix_op.Static, UP_op)
|
1475 | e_die('Not implemented', op.tok)
|
1476 |
|
1477 | else:
|
1478 | raise AssertionError()
|
1479 |
|
1480 | # After applying suffixes, process join_array here.
|
1481 | UP_val = val
|
1482 | if val.tag() == value_e.BashArray:
|
1483 | array_val = cast(value.BashArray, UP_val)
|
1484 | if vsub_state.join_array:
|
1485 | val = self._DecayArray(array_val)
|
1486 | else:
|
1487 | val = array_val
|
1488 |
|
1489 | # For example, ${a} evaluates to value.Str(), but we want a
|
1490 | # Piece().
|
1491 | part_val = _ValueToPartValue(val, quoted or quoted2, part)
|
1492 | part_vals.append(part_val)
|
1493 |
|
1494 | def _ConcatPartVals(self, part_vals, location):
|
1495 | # type: (List[part_value_t], loc_t) -> str
|
1496 |
|
1497 | strs = [] # type: List[str]
|
1498 | for part_val in part_vals:
|
1499 | UP_part_val = part_val
|
1500 | with tagswitch(part_val) as case:
|
1501 | if case(part_value_e.String):
|
1502 | part_val = cast(Piece, UP_part_val)
|
1503 | s = part_val.s
|
1504 |
|
1505 | elif case(part_value_e.Array):
|
1506 | part_val = cast(part_value.Array, UP_part_val)
|
1507 | if self.exec_opts.strict_array():
|
1508 | # Examples: echo f > "$@"; local foo="$@"
|
1509 | e_die("Illegal array word part (strict_array)",
|
1510 | location)
|
1511 | else:
|
1512 | # It appears to not respect IFS
|
1513 | # TODO: eliminate double join()?
|
1514 | tmp = [s for s in part_val.strs if s is not None]
|
1515 | s = ' '.join(tmp)
|
1516 |
|
1517 | else:
|
1518 | raise AssertionError()
|
1519 |
|
1520 | strs.append(s)
|
1521 |
|
1522 | return ''.join(strs)
|
1523 |
|
1524 | def EvalBracedVarSubToString(self, part):
|
1525 | # type: (BracedVarSub) -> str
|
1526 | """For double quoted strings in YSH expressions.
|
1527 |
|
1528 | Example: var x = "$foo-${foo}"
|
1529 | """
|
1530 | part_vals = [] # type: List[part_value_t]
|
1531 | self._EvalBracedVarSub(part, part_vals, False)
|
1532 | # blame ${ location
|
1533 | return self._ConcatPartVals(part_vals, part.left)
|
1534 |
|
1535 | def _EvalSimpleVarSub(self, part, part_vals, quoted):
|
1536 | # type: (SimpleVarSub, List[part_value_t], bool) -> None
|
1537 |
|
1538 | token = part.tok
|
1539 |
|
1540 | vsub_state = VarSubState.CreateNull()
|
1541 |
|
1542 | # 1. Evaluate from (var_name, var_num, Token) -> defined, value
|
1543 | if token.id == Id.VSub_DollarName:
|
1544 | var_name = lexer.LazyStr(token)
|
1545 | # TODO: Special case for LINENO
|
1546 | val = self.mem.GetValue(var_name)
|
1547 | if val.tag() in (value_e.BashArray, value_e.BashAssoc):
|
1548 | if ShouldArrayDecay(var_name, self.exec_opts):
|
1549 | # for $BASH_SOURCE, etc.
|
1550 | val = DecayArray(val)
|
1551 | else:
|
1552 | e_die(
|
1553 | "Array %r can't be referred to as a scalar (without @ or *)"
|
1554 | % var_name, token)
|
1555 |
|
1556 | elif token.id == Id.VSub_Number:
|
1557 | var_num = int(lexer.LazyStr(token))
|
1558 | val = self._EvalVarNum(var_num)
|
1559 |
|
1560 | else:
|
1561 | val = self._EvalSpecialVar(token.id, quoted, vsub_state)
|
1562 |
|
1563 | #log('SIMPLE %s', part)
|
1564 | val = self._EmptyStrOrError(val, token)
|
1565 | UP_val = val
|
1566 | if val.tag() == value_e.BashArray:
|
1567 | array_val = cast(value.BashArray, UP_val)
|
1568 | if vsub_state.join_array:
|
1569 | val = self._DecayArray(array_val)
|
1570 | else:
|
1571 | val = array_val
|
1572 |
|
1573 | v = _ValueToPartValue(val, quoted, part)
|
1574 | part_vals.append(v)
|
1575 |
|
1576 | def EvalSimpleVarSubToString(self, node):
|
1577 | # type: (SimpleVarSub) -> str
|
1578 | """For double quoted strings in YSH expressions.
|
1579 |
|
1580 | Example: var x = "$foo-${foo}"
|
1581 | """
|
1582 | part_vals = [] # type: List[part_value_t]
|
1583 | self._EvalSimpleVarSub(node, part_vals, False)
|
1584 | return self._ConcatPartVals(part_vals, node.tok)
|
1585 |
|
1586 | def _EvalExtGlob(self, part, part_vals):
|
1587 | # type: (word_part.ExtGlob, List[part_value_t]) -> None
|
1588 | """Evaluate @($x|'foo'|$(hostname)) and flatten it."""
|
1589 | op = part.op
|
1590 | if op.id == Id.ExtGlob_Comma:
|
1591 | op_str = '@('
|
1592 | else:
|
1593 | op_str = lexer.LazyStr(op)
|
1594 | # Do NOT split these.
|
1595 | part_vals.append(Piece(op_str, False, False))
|
1596 |
|
1597 | for i, w in enumerate(part.arms):
|
1598 | if i != 0:
|
1599 | part_vals.append(Piece('|', False, False)) # separator
|
1600 | # FLATTEN the tree of extglob "arms".
|
1601 | self._EvalWordToParts(w, part_vals, EXTGLOB_NESTED)
|
1602 | part_vals.append(Piece(')', False, False)) # closing )
|
1603 |
|
1604 | def _TranslateExtGlob(self, part_vals, w, glob_parts, fnmatch_parts):
|
1605 | # type: (List[part_value_t], CompoundWord, List[str], List[str]) -> None
|
1606 | """Translate a flattened WORD with an ExtGlob part to string patterns.
|
1607 |
|
1608 | We need both glob and fnmatch patterns. _EvalExtGlob does the
|
1609 | flattening.
|
1610 | """
|
1611 | for i, part_val in enumerate(part_vals):
|
1612 | UP_part_val = part_val
|
1613 | with tagswitch(part_val) as case:
|
1614 | if case(part_value_e.String):
|
1615 | part_val = cast(Piece, UP_part_val)
|
1616 | if part_val.quoted and not self.exec_opts.noglob():
|
1617 | s = glob_.GlobEscape(part_val.s)
|
1618 | else:
|
1619 | # e.g. the @( and | in @(foo|bar) aren't quoted
|
1620 | s = part_val.s
|
1621 | glob_parts.append(s)
|
1622 | fnmatch_parts.append(s) # from _EvalExtGlob()
|
1623 |
|
1624 | elif case(part_value_e.Array):
|
1625 | # Disallow array
|
1626 | e_die(
|
1627 | "Extended globs and arrays can't appear in the same word",
|
1628 | w)
|
1629 |
|
1630 | elif case(part_value_e.ExtGlob):
|
1631 | part_val = cast(part_value.ExtGlob, UP_part_val)
|
1632 | # keep appending fnmatch_parts, but repplace glob_parts with '*'
|
1633 | self._TranslateExtGlob(part_val.part_vals, w, [],
|
1634 | fnmatch_parts)
|
1635 | glob_parts.append('*')
|
1636 |
|
1637 | else:
|
1638 | raise AssertionError()
|
1639 |
|
1640 | def _EvalWordPart(self, part, part_vals, flags):
|
1641 | # type: (word_part_t, List[part_value_t], int) -> None
|
1642 | """Evaluate a word part, appending to part_vals
|
1643 |
|
1644 | Called by _EvalWordToParts, EvalWordToString, and _EvalDoubleQuoted.
|
1645 | """
|
1646 | quoted = bool(flags & QUOTED)
|
1647 | is_subst = bool(flags & IS_SUBST)
|
1648 |
|
1649 | UP_part = part
|
1650 | with tagswitch(part) as case:
|
1651 | if case(word_part_e.ShArrayLiteral):
|
1652 | part = cast(ShArrayLiteral, UP_part)
|
1653 | e_die("Unexpected array literal", loc.WordPart(part))
|
1654 | elif case(word_part_e.BashAssocLiteral):
|
1655 | part = cast(word_part.BashAssocLiteral, UP_part)
|
1656 | e_die("Unexpected associative array literal",
|
1657 | loc.WordPart(part))
|
1658 |
|
1659 | elif case(word_part_e.Literal):
|
1660 | part = cast(Token, UP_part)
|
1661 | # Split if it's in a substitution.
|
1662 | # That is: echo is not split, but ${foo:-echo} is split
|
1663 | v = Piece(lexer.LazyStr(part), quoted, is_subst)
|
1664 | part_vals.append(v)
|
1665 |
|
1666 | elif case(word_part_e.EscapedLiteral):
|
1667 | part = cast(word_part.EscapedLiteral, UP_part)
|
1668 | v = Piece(part.ch, True, False)
|
1669 | part_vals.append(v)
|
1670 |
|
1671 | elif case(word_part_e.SingleQuoted):
|
1672 | part = cast(SingleQuoted, UP_part)
|
1673 | v = Piece(part.sval, True, False)
|
1674 | part_vals.append(v)
|
1675 |
|
1676 | elif case(word_part_e.DoubleQuoted):
|
1677 | part = cast(DoubleQuoted, UP_part)
|
1678 | self._EvalDoubleQuoted(part.parts, part_vals)
|
1679 |
|
1680 | elif case(word_part_e.CommandSub):
|
1681 | part = cast(CommandSub, UP_part)
|
1682 | id_ = part.left_token.id
|
1683 | if id_ in (Id.Left_DollarParen, Id.Left_AtParen,
|
1684 | Id.Left_Backtick):
|
1685 | sv = self._EvalCommandSub(part,
|
1686 | quoted) # type: part_value_t
|
1687 |
|
1688 | elif id_ in (Id.Left_ProcSubIn, Id.Left_ProcSubOut):
|
1689 | sv = self._EvalProcessSub(part)
|
1690 |
|
1691 | else:
|
1692 | raise AssertionError(id_)
|
1693 |
|
1694 | part_vals.append(sv)
|
1695 |
|
1696 | elif case(word_part_e.SimpleVarSub):
|
1697 | part = cast(SimpleVarSub, UP_part)
|
1698 | self._EvalSimpleVarSub(part, part_vals, quoted)
|
1699 |
|
1700 | elif case(word_part_e.BracedVarSub):
|
1701 | part = cast(BracedVarSub, UP_part)
|
1702 | self._EvalBracedVarSub(part, part_vals, quoted)
|
1703 |
|
1704 | elif case(word_part_e.TildeSub):
|
1705 | part = cast(word_part.TildeSub, UP_part)
|
1706 | # We never parse a quoted string into a TildeSub.
|
1707 | assert not quoted
|
1708 | s = self.tilde_ev.Eval(part)
|
1709 | v = Piece(s, True, False) # NOT split even when unquoted!
|
1710 | part_vals.append(v)
|
1711 |
|
1712 | elif case(word_part_e.ArithSub):
|
1713 | part = cast(word_part.ArithSub, UP_part)
|
1714 | num = self.arith_ev.EvalToBigInt(part.anode)
|
1715 | v = Piece(mops.ToStr(num), quoted, not quoted)
|
1716 | part_vals.append(v)
|
1717 |
|
1718 | elif case(word_part_e.ExtGlob):
|
1719 | part = cast(word_part.ExtGlob, UP_part)
|
1720 | #if not self.exec_opts.extglob():
|
1721 | # die() # disallow at runtime? Don't just decay
|
1722 |
|
1723 | # Create a node to hold the flattened tree. The caller decides whether
|
1724 | # to pass it to fnmatch() or replace it with '*' and pass it to glob().
|
1725 | part_vals2 = [] # type: List[part_value_t]
|
1726 | self._EvalExtGlob(part, part_vals2) # flattens tree
|
1727 | part_vals.append(part_value.ExtGlob(part_vals2))
|
1728 |
|
1729 | elif case(word_part_e.BashRegexGroup):
|
1730 | part = cast(word_part.BashRegexGroup, UP_part)
|
1731 |
|
1732 | part_vals.append(Piece('(', False, False)) # not quoted
|
1733 | if part.child:
|
1734 | self._EvalWordToParts(part.child, part_vals, 0)
|
1735 | part_vals.append(Piece(')', False, False))
|
1736 |
|
1737 | elif case(word_part_e.Splice):
|
1738 | part = cast(word_part.Splice, UP_part)
|
1739 | val = self.mem.GetValue(part.var_name)
|
1740 |
|
1741 | strs = self.expr_ev.SpliceValue(val, part)
|
1742 | part_vals.append(part_value.Array(strs))
|
1743 |
|
1744 | elif case(word_part_e.ExprSub):
|
1745 | part = cast(word_part.ExprSub, UP_part)
|
1746 | part_val = self.expr_ev.EvalExprSub(part)
|
1747 | part_vals.append(part_val)
|
1748 |
|
1749 | elif case(word_part_e.ZshVarSub):
|
1750 | part = cast(word_part.ZshVarSub, UP_part)
|
1751 | e_die("ZSH var subs are parsed, but can't be evaluated",
|
1752 | part.left)
|
1753 |
|
1754 | else:
|
1755 | raise AssertionError(part.tag())
|
1756 |
|
1757 | def _EvalRhsWordToParts(self, w, part_vals, eval_flags=0):
|
1758 | # type: (rhs_word_t, List[part_value_t], int) -> None
|
1759 | quoted = bool(eval_flags & QUOTED)
|
1760 |
|
1761 | UP_w = w
|
1762 | with tagswitch(w) as case:
|
1763 | if case(rhs_word_e.Empty):
|
1764 | part_vals.append(Piece('', quoted, not quoted))
|
1765 |
|
1766 | elif case(rhs_word_e.Compound):
|
1767 | w = cast(CompoundWord, UP_w)
|
1768 | self._EvalWordToParts(w, part_vals, eval_flags=eval_flags)
|
1769 |
|
1770 | else:
|
1771 | raise AssertionError()
|
1772 |
|
1773 | def _EvalWordToParts(self, w, part_vals, eval_flags=0):
|
1774 | # type: (CompoundWord, List[part_value_t], int) -> None
|
1775 | """Helper for EvalRhsWord, EvalWordSequence, etc.
|
1776 |
|
1777 | Returns:
|
1778 | Appends to part_vals. Note that this is a TREE.
|
1779 | """
|
1780 | # Does the word have an extended glob? This is a special case because
|
1781 | # of the way we use glob() and then fnmatch(..., FNM_EXTMATCH) to
|
1782 | # implement extended globs. It's hard to carry that extra information
|
1783 | # all the way past the word splitting stage.
|
1784 |
|
1785 | # OSH semantic limitations: If a word has an extended glob part, then
|
1786 | # 1. It can't have an array
|
1787 | # 2. Word splitting of unquoted words isn't respected
|
1788 |
|
1789 | word_part_vals = [] # type: List[part_value_t]
|
1790 | has_extglob = False
|
1791 | for p in w.parts:
|
1792 | if p.tag() == word_part_e.ExtGlob:
|
1793 | has_extglob = True
|
1794 | self._EvalWordPart(p, word_part_vals, eval_flags)
|
1795 |
|
1796 | # Caller REQUESTED extglob evaluation, AND we parsed word_part.ExtGlob()
|
1797 | if has_extglob:
|
1798 | if bool(eval_flags & EXTGLOB_FILES):
|
1799 | # Treat the WHOLE word as a pattern. We need to TWO VARIANTS of the
|
1800 | # word because of the way we use libc:
|
1801 | # 1. With '*' for extglob parts
|
1802 | # 2. With _EvalExtGlob() for extglob parts
|
1803 |
|
1804 | glob_parts = [] # type: List[str]
|
1805 | fnmatch_parts = [] # type: List[str]
|
1806 | self._TranslateExtGlob(word_part_vals, w, glob_parts,
|
1807 | fnmatch_parts)
|
1808 |
|
1809 | #log('word_part_vals %s', word_part_vals)
|
1810 | glob_pat = ''.join(glob_parts)
|
1811 | fnmatch_pat = ''.join(fnmatch_parts)
|
1812 | #log("glob %s fnmatch %s", glob_pat, fnmatch_pat)
|
1813 |
|
1814 | results = [] # type: List[str]
|
1815 | n = self.globber.ExpandExtended(glob_pat, fnmatch_pat, results)
|
1816 | if n < 0:
|
1817 | raise error.FailGlob(
|
1818 | 'Extended glob %r matched no files' % fnmatch_pat, w)
|
1819 |
|
1820 | part_vals.append(part_value.Array(results))
|
1821 | elif bool(eval_flags & EXTGLOB_NESTED):
|
1822 | # We only glob at the TOP level of @(nested|@(pattern))
|
1823 | part_vals.extend(word_part_vals)
|
1824 | else:
|
1825 | # e.g. simple_word_eval, assignment builtin
|
1826 | e_die('Extended glob not allowed in this word', w)
|
1827 | else:
|
1828 | part_vals.extend(word_part_vals)
|
1829 |
|
1830 | def _PartValsToString(self, part_vals, w, eval_flags, strs):
|
1831 | # type: (List[part_value_t], CompoundWord, int, List[str]) -> None
|
1832 | """Helper for EvalWordToString, similar to _ConcatPartVals() above.
|
1833 |
|
1834 | Note: arg 'w' could just be a span ID
|
1835 | """
|
1836 | for part_val in part_vals:
|
1837 | UP_part_val = part_val
|
1838 | with tagswitch(part_val) as case:
|
1839 | if case(part_value_e.String):
|
1840 | part_val = cast(Piece, UP_part_val)
|
1841 | s = part_val.s
|
1842 | if part_val.quoted:
|
1843 | if eval_flags & QUOTE_FNMATCH:
|
1844 | # [[ foo == */"*".py ]] or case (*.py) or ${x%*.py} or ${x//*.py/}
|
1845 | s = glob_.GlobEscape(s)
|
1846 | elif eval_flags & QUOTE_ERE:
|
1847 | s = glob_.ExtendedRegexEscape(s)
|
1848 | strs.append(s)
|
1849 |
|
1850 | elif case(part_value_e.Array):
|
1851 | part_val = cast(part_value.Array, UP_part_val)
|
1852 | if self.exec_opts.strict_array():
|
1853 | # Examples: echo f > "$@"; local foo="$@"
|
1854 |
|
1855 | # TODO: This attributes too coarsely, to the word rather than the
|
1856 | # parts. Problem: the word is a TREE of parts, but we only have a
|
1857 | # flat list of part_vals. The only case where we really get arrays
|
1858 | # is "$@", "${a[@]}", "${a[@]//pat/replace}", etc.
|
1859 | e_die(
|
1860 | "This word should yield a string, but it contains an array",
|
1861 | w)
|
1862 |
|
1863 | # TODO: Maybe add detail like this.
|
1864 | #e_die('RHS of assignment should only have strings. '
|
1865 | # 'To assign arrays, use b=( "${a[@]}" )')
|
1866 | else:
|
1867 | # It appears to not respect IFS
|
1868 | tmp = [s for s in part_val.strs if s is not None]
|
1869 | s = ' '.join(tmp) # TODO: eliminate double join()?
|
1870 | strs.append(s)
|
1871 |
|
1872 | elif case(part_value_e.ExtGlob):
|
1873 | part_val = cast(part_value.ExtGlob, UP_part_val)
|
1874 |
|
1875 | # Extended globs are only allowed where we expect them!
|
1876 | if not bool(eval_flags & QUOTE_FNMATCH):
|
1877 | e_die('extended glob not allowed in this word', w)
|
1878 |
|
1879 | # recursive call
|
1880 | self._PartValsToString(part_val.part_vals, w, eval_flags,
|
1881 | strs)
|
1882 |
|
1883 | else:
|
1884 | raise AssertionError()
|
1885 |
|
1886 | def EvalWordToString(self, UP_w, eval_flags=0):
|
1887 | # type: (word_t, int) -> value.Str
|
1888 | """Given a word, return a string.
|
1889 |
|
1890 | Flags can contain a quoting algorithm.
|
1891 | """
|
1892 | assert UP_w.tag() == word_e.Compound, UP_w
|
1893 | w = cast(CompoundWord, UP_w)
|
1894 |
|
1895 | if eval_flags == 0: # QUOTE_FNMATCH etc. breaks optimization
|
1896 | fast_str = word_.FastStrEval(w)
|
1897 | if fast_str is not None:
|
1898 | return value.Str(fast_str)
|
1899 |
|
1900 | # Could we additionally optimize a=$b, if we know $b isn't an array
|
1901 | # etc.?
|
1902 |
|
1903 | # Note: these empty lists are hot in fib benchmark
|
1904 |
|
1905 | part_vals = [] # type: List[part_value_t]
|
1906 | for p in w.parts:
|
1907 | # this doesn't use eval_flags, which is slightly confusing
|
1908 | self._EvalWordPart(p, part_vals, 0)
|
1909 |
|
1910 | strs = [] # type: List[str]
|
1911 | self._PartValsToString(part_vals, w, eval_flags, strs)
|
1912 | return value.Str(''.join(strs))
|
1913 |
|
1914 | def EvalWordToPattern(self, UP_w):
|
1915 | # type: (rhs_word_t) -> Tuple[value.Str, bool]
|
1916 | """Like EvalWordToString, but returns whether we got ExtGlob."""
|
1917 | if UP_w.tag() == rhs_word_e.Empty:
|
1918 | return value.Str(''), False
|
1919 |
|
1920 | assert UP_w.tag() == rhs_word_e.Compound, UP_w
|
1921 | w = cast(CompoundWord, UP_w)
|
1922 |
|
1923 | has_extglob = False
|
1924 | part_vals = [] # type: List[part_value_t]
|
1925 | for p in w.parts:
|
1926 | # this doesn't use eval_flags, which is slightly confusing
|
1927 | self._EvalWordPart(p, part_vals, 0)
|
1928 | if p.tag() == word_part_e.ExtGlob:
|
1929 | has_extglob = True
|
1930 |
|
1931 | strs = [] # type: List[str]
|
1932 | self._PartValsToString(part_vals, w, QUOTE_FNMATCH, strs)
|
1933 | return value.Str(''.join(strs)), has_extglob
|
1934 |
|
1935 | def EvalForPlugin(self, w):
|
1936 | # type: (CompoundWord) -> value.Str
|
1937 | """Wrapper around EvalWordToString that prevents errors.
|
1938 |
|
1939 | Runtime errors like $(( 1 / 0 )) and mutating $? like $(exit 42)
|
1940 | are handled here.
|
1941 |
|
1942 | Similar to ExprEvaluator.PluginCall().
|
1943 | """
|
1944 | with state.ctx_Registers(self.mem): # to "sandbox" $? and $PIPESTATUS
|
1945 | try:
|
1946 | val = self.EvalWordToString(w)
|
1947 | except error.FatalRuntime as e:
|
1948 | val = value.Str('<Runtime error: %s>' % e.UserErrorString())
|
1949 |
|
1950 | except (IOError, OSError) as e:
|
1951 | val = value.Str('<I/O error: %s>' % pyutil.strerror(e))
|
1952 |
|
1953 | except KeyboardInterrupt:
|
1954 | val = value.Str('<Ctrl-C>')
|
1955 |
|
1956 | return val
|
1957 |
|
1958 | def EvalRhsWord(self, UP_w):
|
1959 | # type: (rhs_word_t) -> value_t
|
1960 | """Used for RHS of assignment.
|
1961 |
|
1962 | There is no splitting.
|
1963 | """
|
1964 | if UP_w.tag() == rhs_word_e.Empty:
|
1965 | return value.Str('')
|
1966 |
|
1967 | assert UP_w.tag() == word_e.Compound, UP_w
|
1968 | w = cast(CompoundWord, UP_w)
|
1969 |
|
1970 | if len(w.parts) == 1:
|
1971 | part0 = w.parts[0]
|
1972 | UP_part0 = part0
|
1973 | tag = part0.tag()
|
1974 | # Special case for a=(1 2). ShArrayLiteral won't appear in words that
|
1975 | # don't look like assignments.
|
1976 | if tag == word_part_e.ShArrayLiteral:
|
1977 | part0 = cast(ShArrayLiteral, UP_part0)
|
1978 | array_words = part0.words
|
1979 | words = braces.BraceExpandWords(array_words)
|
1980 | strs = self.EvalWordSequence(words)
|
1981 | return value.BashArray(strs)
|
1982 |
|
1983 | if tag == word_part_e.BashAssocLiteral:
|
1984 | part0 = cast(word_part.BashAssocLiteral, UP_part0)
|
1985 | d = NewDict() # type: Dict[str, str]
|
1986 | for pair in part0.pairs:
|
1987 | k = self.EvalWordToString(pair.key)
|
1988 | v = self.EvalWordToString(pair.value)
|
1989 | d[k.s] = v.s
|
1990 | return value.BashAssoc(d)
|
1991 |
|
1992 | # If RHS doesn't look like a=( ... ), then it must be a string.
|
1993 | return self.EvalWordToString(w)
|
1994 |
|
1995 | def _EvalWordFrame(self, frame, argv):
|
1996 | # type: (List[Piece], List[str]) -> None
|
1997 | all_empty = True
|
1998 | all_quoted = True
|
1999 | any_quoted = False
|
2000 |
|
2001 | #log('--- frame %s', frame)
|
2002 |
|
2003 | for piece in frame:
|
2004 | if len(piece.s):
|
2005 | all_empty = False
|
2006 |
|
2007 | if piece.quoted:
|
2008 | any_quoted = True
|
2009 | else:
|
2010 | all_quoted = False
|
2011 |
|
2012 | # Elision of ${empty}${empty} but not $empty"$empty" or $empty""
|
2013 | if all_empty and not any_quoted:
|
2014 | return
|
2015 |
|
2016 | # If every frag is quoted, e.g. "$a$b" or any part in "${a[@]}"x, then
|
2017 | # don't do word splitting or globbing.
|
2018 | if all_quoted:
|
2019 | tmp = [piece.s for piece in frame]
|
2020 | a = ''.join(tmp)
|
2021 | argv.append(a)
|
2022 | return
|
2023 |
|
2024 | will_glob = not self.exec_opts.noglob()
|
2025 |
|
2026 | # Array of strings, some of which are BOTH IFS-escaped and GLOB escaped!
|
2027 | frags = [] # type: List[str]
|
2028 | for piece in frame:
|
2029 | if will_glob and piece.quoted:
|
2030 | frag = glob_.GlobEscape(piece.s)
|
2031 | else:
|
2032 | # If we have a literal \, then we turn it into \\\\.
|
2033 | # Splitting takes \\\\ -> \\
|
2034 | # Globbing takes \\ to \ if it doesn't match
|
2035 | frag = _BackslashEscape(piece.s)
|
2036 |
|
2037 | if piece.do_split:
|
2038 | frag = _BackslashEscape(frag)
|
2039 | else:
|
2040 | frag = self.splitter.Escape(frag)
|
2041 |
|
2042 | frags.append(frag)
|
2043 |
|
2044 | flat = ''.join(frags)
|
2045 | #log('flat: %r', flat)
|
2046 |
|
2047 | args = self.splitter.SplitForWordEval(flat)
|
2048 |
|
2049 | # space=' '; argv $space"". We have a quoted part, but we CANNOT elide.
|
2050 | # Add it back and don't bother globbing.
|
2051 | if len(args) == 0 and any_quoted:
|
2052 | argv.append('')
|
2053 | return
|
2054 |
|
2055 | #log('split args: %r', args)
|
2056 | for a in args:
|
2057 | if glob_.LooksLikeGlob(a):
|
2058 | n = self.globber.Expand(a, argv)
|
2059 | if n < 0:
|
2060 | # TODO: location info, with span IDs carried through the frame
|
2061 | raise error.FailGlob('Pattern %r matched no files' % a,
|
2062 | loc.Missing)
|
2063 | else:
|
2064 | argv.append(glob_.GlobUnescape(a))
|
2065 |
|
2066 | def _EvalWordToArgv(self, w):
|
2067 | # type: (CompoundWord) -> List[str]
|
2068 | """Helper for _EvalAssignBuiltin.
|
2069 |
|
2070 | Splitting and globbing are disabled for assignment builtins.
|
2071 |
|
2072 | Example: declare -"${a[@]}" b=(1 2)
|
2073 | where a is [x b=a d=a]
|
2074 | """
|
2075 | part_vals = [] # type: List[part_value_t]
|
2076 | self._EvalWordToParts(w, part_vals, 0) # not double quoted
|
2077 | frames = _MakeWordFrames(part_vals)
|
2078 | argv = [] # type: List[str]
|
2079 | for frame in frames:
|
2080 | if len(frame): # empty array gives empty frame!
|
2081 | tmp = [piece.s for piece in frame]
|
2082 | argv.append(''.join(tmp)) # no split or glob
|
2083 | #log('argv: %s', argv)
|
2084 | return argv
|
2085 |
|
2086 | def _EvalAssignBuiltin(self, builtin_id, arg0, words):
|
2087 | # type: (builtin_t, str, List[CompoundWord]) -> cmd_value.Assign
|
2088 | """Handles both static and dynamic assignment, e.g.
|
2089 |
|
2090 | x='foo=bar'
|
2091 | local a=(1 2) $x
|
2092 |
|
2093 | Grammar:
|
2094 |
|
2095 | ('builtin' | 'command')* keyword flag* pair*
|
2096 | flag = [-+].*
|
2097 |
|
2098 | There is also command -p, but we haven't implemented it. Maybe just
|
2099 | punt on it.
|
2100 | """
|
2101 | eval_to_pairs = True # except for -f and -F
|
2102 | started_pairs = False
|
2103 |
|
2104 | flags = [arg0] # initial flags like -p, and -f -F name1 name2
|
2105 | flag_locs = [words[0]]
|
2106 | assign_args = [] # type: List[AssignArg]
|
2107 |
|
2108 | n = len(words)
|
2109 | for i in xrange(1, n): # skip first word
|
2110 | w = words[i]
|
2111 |
|
2112 | if word_.IsVarLike(w):
|
2113 | started_pairs = True # Everything from now on is an assign_pair
|
2114 |
|
2115 | if started_pairs:
|
2116 | left_token, close_token, part_offset = word_.DetectShAssignment(
|
2117 | w)
|
2118 | if left_token: # Detected statically
|
2119 | if left_token.id != Id.Lit_VarLike:
|
2120 | # (not guaranteed since started_pairs is set twice)
|
2121 | e_die('LHS array not allowed in assignment builtin', w)
|
2122 |
|
2123 | if lexer.IsPlusEquals(left_token):
|
2124 | var_name = lexer.TokenSliceRight(left_token, -2)
|
2125 | append = True
|
2126 | else:
|
2127 | var_name = lexer.TokenSliceRight(left_token, -1)
|
2128 | append = False
|
2129 |
|
2130 | if part_offset == len(w.parts):
|
2131 | rhs = rhs_word.Empty # type: rhs_word_t
|
2132 | else:
|
2133 | # tmp is for intersection of C++/MyPy type systems
|
2134 | tmp = CompoundWord(w.parts[part_offset:])
|
2135 | word_.TildeDetectAssign(tmp)
|
2136 | rhs = tmp
|
2137 |
|
2138 | with state.ctx_AssignBuiltin(self.mutable_opts):
|
2139 | right = self.EvalRhsWord(rhs)
|
2140 |
|
2141 | arg2 = AssignArg(var_name, right, append, w)
|
2142 | assign_args.append(arg2)
|
2143 |
|
2144 | else: # e.g. export $dynamic
|
2145 | argv = self._EvalWordToArgv(w)
|
2146 | for arg in argv:
|
2147 | arg2 = _SplitAssignArg(arg, w)
|
2148 | assign_args.append(arg2)
|
2149 |
|
2150 | else:
|
2151 | argv = self._EvalWordToArgv(w)
|
2152 | for arg in argv:
|
2153 | if arg.startswith('-') or arg.startswith('+'):
|
2154 | # e.g. declare -r +r
|
2155 | flags.append(arg)
|
2156 | flag_locs.append(w)
|
2157 |
|
2158 | # Shortcut that relies on -f and -F always meaning "function" for
|
2159 | # all assignment builtins
|
2160 | if 'f' in arg or 'F' in arg:
|
2161 | eval_to_pairs = False
|
2162 |
|
2163 | else: # e.g. export $dynamic
|
2164 | if eval_to_pairs:
|
2165 | arg2 = _SplitAssignArg(arg, w)
|
2166 | assign_args.append(arg2)
|
2167 | started_pairs = True
|
2168 | else:
|
2169 | flags.append(arg)
|
2170 |
|
2171 | return cmd_value.Assign(builtin_id, flags, flag_locs, assign_args)
|
2172 |
|
2173 | def _DetectAssignBuiltinStr(self, arg0, words, offset):
|
2174 | # type: (str, List[CompoundWord], int) -> Optional[cmd_value.Assign]
|
2175 | builtin_id = consts.LookupAssignBuiltin(arg0)
|
2176 | if builtin_id != consts.NO_INDEX:
|
2177 | return self._EvalAssignBuiltin(builtin_id, arg0, words[offset:])
|
2178 | return None
|
2179 |
|
2180 | def _DetectAssignBuiltin(self, val0, words, offset):
|
2181 | # type: (part_value_t, List[CompoundWord], int) -> Optional[cmd_value.Assign]
|
2182 | UP_val0 = val0
|
2183 | if val0.tag() == part_value_e.String:
|
2184 | val0 = cast(Piece, UP_val0)
|
2185 | if not val0.quoted:
|
2186 | return self._DetectAssignBuiltinStr(val0.s, words, offset)
|
2187 | return None
|
2188 |
|
2189 | def SimpleEvalWordSequence2(self, words, allow_assign):
|
2190 | # type: (List[CompoundWord], bool) -> cmd_value_t
|
2191 | """Simple word evaluation for YSH."""
|
2192 | strs = [] # type: List[str]
|
2193 | locs = [] # type: List[CompoundWord]
|
2194 |
|
2195 | assign_builtin_offset = 0
|
2196 | for i, w in enumerate(words):
|
2197 | # No globbing in the first arg for command.Simple.
|
2198 | if i == assign_builtin_offset and allow_assign:
|
2199 | strs0 = self._EvalWordToArgv(w)
|
2200 | # TODO: Remove this because YSH will disallow assignment
|
2201 | # builtins? (including export?)
|
2202 | if len(strs0) == 1:
|
2203 | cmd_val = self._DetectAssignBuiltinStr(
|
2204 | strs0[0], words, assign_builtin_offset)
|
2205 | if cmd_val:
|
2206 | return cmd_val
|
2207 |
|
2208 | strs.extend(strs0)
|
2209 | for _ in strs0:
|
2210 | locs.append(w)
|
2211 | continue
|
2212 |
|
2213 | if glob_.LooksLikeStaticGlob(w):
|
2214 | val = self.EvalWordToString(w) # respects strict-array
|
2215 | num_appended = self.globber.Expand(val.s, strs)
|
2216 | if num_appended < 0:
|
2217 | raise error.FailGlob('Pattern %r matched no files' % val.s,
|
2218 | w)
|
2219 | for _ in xrange(num_appended):
|
2220 | locs.append(w)
|
2221 | continue
|
2222 |
|
2223 | part_vals = [] # type: List[part_value_t]
|
2224 | self._EvalWordToParts(w, part_vals, 0) # not quoted
|
2225 |
|
2226 | if 0:
|
2227 | log('')
|
2228 | log('Static: part_vals after _EvalWordToParts:')
|
2229 | for entry in part_vals:
|
2230 | log(' %s', entry)
|
2231 |
|
2232 | # Still need to process
|
2233 | frames = _MakeWordFrames(part_vals)
|
2234 |
|
2235 | if 0:
|
2236 | log('')
|
2237 | log('Static: frames after _MakeWordFrames:')
|
2238 | for entry in frames:
|
2239 | log(' %s', entry)
|
2240 |
|
2241 | # We will still allow x"${a[@]"x, though it's deprecated by @a, which
|
2242 | # disallows such expressions at parse time.
|
2243 | for frame in frames:
|
2244 | if len(frame): # empty array gives empty frame!
|
2245 | tmp = [piece.s for piece in frame]
|
2246 | strs.append(''.join(tmp)) # no split or glob
|
2247 | locs.append(w)
|
2248 |
|
2249 | return cmd_value.Argv(strs, locs, None, None, None, None)
|
2250 |
|
2251 | def EvalWordSequence2(self, words, allow_assign=False):
|
2252 | # type: (List[CompoundWord], bool) -> cmd_value_t
|
2253 | """Turns a list of Words into a list of strings.
|
2254 |
|
2255 | Unlike the EvalWord*() methods, it does globbing.
|
2256 |
|
2257 | Args:
|
2258 | allow_assign: True for command.Simple, False for BashArray a=(1 2 3)
|
2259 | """
|
2260 | if self.exec_opts.simple_word_eval():
|
2261 | return self.SimpleEvalWordSequence2(words, allow_assign)
|
2262 |
|
2263 | # Parse time:
|
2264 | # 1. brace expansion. TODO: Do at parse time.
|
2265 | # 2. Tilde detection. DONE at parse time. Only if Id.Lit_Tilde is the
|
2266 | # first WordPart.
|
2267 | #
|
2268 | # Run time:
|
2269 | # 3. tilde sub, var sub, command sub, arith sub. These are all
|
2270 | # "concurrent" on WordParts. (optional process sub with <() )
|
2271 | # 4. word splitting. Can turn this off with a shell option? Definitely
|
2272 | # off for oil.
|
2273 | # 5. globbing -- several exec_opts affect this: nullglob, safeglob, etc.
|
2274 |
|
2275 | #log('W %s', words)
|
2276 | strs = [] # type: List[str]
|
2277 | locs = [] # type: List[CompoundWord]
|
2278 |
|
2279 | assign_builtin_offset = 0
|
2280 |
|
2281 | n = 0
|
2282 | for i, w in enumerate(words):
|
2283 | fast_str = word_.FastStrEval(w)
|
2284 | if fast_str is not None:
|
2285 | strs.append(fast_str)
|
2286 | locs.append(w)
|
2287 |
|
2288 | # e.g. the 'local' in 'local a=b c=d' will be here
|
2289 | if allow_assign and i == assign_builtin_offset:
|
2290 | cmd_val = self._DetectAssignBuiltinStr(
|
2291 | fast_str, words, assign_builtin_offset)
|
2292 | if cmd_val:
|
2293 | return cmd_val
|
2294 | #print('YO %s' % fast_str)
|
2295 | if _DetectMetaBuiltinStr(fast_str):
|
2296 | #print('META')
|
2297 | assign_builtin_offset += 1
|
2298 | continue
|
2299 |
|
2300 | part_vals = [] # type: List[part_value_t]
|
2301 | self._EvalWordToParts(w, part_vals, EXTGLOB_FILES)
|
2302 |
|
2303 | # DYNAMICALLY detect if we're going to run an assignment builtin, and
|
2304 | # change the rest of the evaluation algorithm if so.
|
2305 | #
|
2306 | # We want to allow:
|
2307 | # e=export
|
2308 | # $e foo=bar
|
2309 | #
|
2310 | # But we don't want to evaluate the first word twice in the case of:
|
2311 | # $(some-command) --flag
|
2312 | if (allow_assign and i == assign_builtin_offset and
|
2313 | len(part_vals) == 1):
|
2314 | cmd_val = self._DetectAssignBuiltin(part_vals[0], words,
|
2315 | assign_builtin_offset)
|
2316 | if cmd_val:
|
2317 | return cmd_val
|
2318 |
|
2319 | if len(part_vals) == 1:
|
2320 | if _DetectMetaBuiltin(part_vals[0]):
|
2321 | assign_builtin_offset += 1
|
2322 |
|
2323 | if 0:
|
2324 | log('')
|
2325 | log('part_vals after _EvalWordToParts:')
|
2326 | for entry in part_vals:
|
2327 | log(' %s', entry)
|
2328 |
|
2329 | frames = _MakeWordFrames(part_vals)
|
2330 | if 0:
|
2331 | log('')
|
2332 | log('frames after _MakeWordFrames:')
|
2333 | for entry in frames:
|
2334 | log(' %s', entry)
|
2335 |
|
2336 | # Do splitting and globbing. Each frame will append zero or more args.
|
2337 | for frame in frames:
|
2338 | self._EvalWordFrame(frame, strs)
|
2339 |
|
2340 | # Fill in locations parallel to strs.
|
2341 | n_next = len(strs)
|
2342 | for _ in xrange(n_next - n):
|
2343 | locs.append(w)
|
2344 | n = n_next
|
2345 |
|
2346 | # A non-assignment command.
|
2347 | # NOTE: Can't look up builtins here like we did for assignment, because
|
2348 | # functions can override builtins.
|
2349 | return cmd_value.Argv(strs, locs, None, None, None, None)
|
2350 |
|
2351 | def EvalWordSequence(self, words):
|
2352 | # type: (List[CompoundWord]) -> List[str]
|
2353 | """For arrays and for loops.
|
2354 |
|
2355 | They don't allow assignment builtins.
|
2356 | """
|
2357 | UP_cmd_val = self.EvalWordSequence2(words)
|
2358 |
|
2359 | assert UP_cmd_val.tag() == cmd_value_e.Argv
|
2360 | cmd_val = cast(cmd_value.Argv, UP_cmd_val)
|
2361 | return cmd_val.argv
|
2362 |
|
2363 |
|
2364 | class NormalWordEvaluator(AbstractWordEvaluator):
|
2365 |
|
2366 | def __init__(
|
2367 | self,
|
2368 | mem, # type: state.Mem
|
2369 | exec_opts, # type: optview.Exec
|
2370 | mutable_opts, # type: state.MutableOpts
|
2371 | tilde_ev, # type: TildeEvaluator
|
2372 | splitter, # type: SplitContext
|
2373 | errfmt, # type: ErrorFormatter
|
2374 | ):
|
2375 | # type: (...) -> None
|
2376 | AbstractWordEvaluator.__init__(self, mem, exec_opts, mutable_opts,
|
2377 | tilde_ev, splitter, errfmt)
|
2378 | self.shell_ex = None # type: _Executor
|
2379 |
|
2380 | def CheckCircularDeps(self):
|
2381 | # type: () -> None
|
2382 | assert self.arith_ev is not None
|
2383 | # Disabled for pure OSH
|
2384 | #assert self.expr_ev is not None
|
2385 | assert self.shell_ex is not None
|
2386 | assert self.prompt_ev is not None
|
2387 |
|
2388 | def _EvalCommandSub(self, cs_part, quoted):
|
2389 | # type: (CommandSub, bool) -> part_value_t
|
2390 | stdout_str = self.shell_ex.RunCommandSub(cs_part)
|
2391 |
|
2392 | if cs_part.left_token.id == Id.Left_AtParen:
|
2393 | # YSH splitting algorithm: does not depend on IFS
|
2394 | try:
|
2395 | strs = j8.SplitJ8Lines(stdout_str)
|
2396 | except error.Decode as e:
|
2397 | # status code 4 is special, for encode/decode errors.
|
2398 | raise error.Structured(4, e.Message(), cs_part.left_token)
|
2399 |
|
2400 | #strs = self.splitter.SplitForWordEval(stdout_str)
|
2401 | return part_value.Array(strs)
|
2402 | else:
|
2403 | return Piece(stdout_str, quoted, not quoted)
|
2404 |
|
2405 | def _EvalProcessSub(self, cs_part):
|
2406 | # type: (CommandSub) -> Piece
|
2407 | dev_path = self.shell_ex.RunProcessSub(cs_part)
|
2408 | # pretend it's quoted; no split or glob
|
2409 | return Piece(dev_path, True, False)
|
2410 |
|
2411 |
|
2412 | _DUMMY = '__NO_COMMAND_SUB__'
|
2413 |
|
2414 |
|
2415 | class CompletionWordEvaluator(AbstractWordEvaluator):
|
2416 | """An evaluator that has no access to an executor.
|
2417 |
|
2418 | NOTE: core/completion.py doesn't actually try to use these strings to
|
2419 | complete. If you have something like 'echo $(echo hi)/f<TAB>', it sees the
|
2420 | inner command as the last one, and knows that it is not at the end of the
|
2421 | line.
|
2422 | """
|
2423 |
|
2424 | def __init__(
|
2425 | self,
|
2426 | mem, # type: state.Mem
|
2427 | exec_opts, # type: optview.Exec
|
2428 | mutable_opts, # type: state.MutableOpts
|
2429 | tilde_ev, # type: TildeEvaluator
|
2430 | splitter, # type: SplitContext
|
2431 | errfmt, # type: ErrorFormatter
|
2432 | ):
|
2433 | # type: (...) -> None
|
2434 | AbstractWordEvaluator.__init__(self, mem, exec_opts, mutable_opts,
|
2435 | tilde_ev, splitter, errfmt)
|
2436 |
|
2437 | def CheckCircularDeps(self):
|
2438 | # type: () -> None
|
2439 | assert self.prompt_ev is not None
|
2440 | assert self.arith_ev is not None
|
2441 | assert self.expr_ev is not None
|
2442 |
|
2443 | def _EvalCommandSub(self, cs_part, quoted):
|
2444 | # type: (CommandSub, bool) -> part_value_t
|
2445 | if cs_part.left_token.id == Id.Left_AtParen:
|
2446 | return part_value.Array([_DUMMY])
|
2447 | else:
|
2448 | return Piece(_DUMMY, quoted, not quoted)
|
2449 |
|
2450 | def _EvalProcessSub(self, cs_part):
|
2451 | # type: (CommandSub) -> Piece
|
2452 | # pretend it's quoted; no split or glob
|
2453 | return Piece('__NO_PROCESS_SUB__', True, False)
|
2454 |
|
2455 |
|
2456 | # vim: sw=4
|