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