| 1 | """Methods on IO type"""
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| 2 | from __future__ import print_function
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| 3 |
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| 4 | from _devbuild.gen.value_asdl import value, value_e, value_t
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| 5 |
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| 6 | from core import error
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| 7 | from core import num
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| 8 | from core import state
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| 9 | from core import vm
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| 10 | from mycpp.mylib import log, NewDict
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| 11 | from osh import prompt
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| 12 |
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| 13 | from typing import Dict, List, cast, TYPE_CHECKING
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| 14 | if TYPE_CHECKING:
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| 15 | from frontend import typed_args
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| 16 | from osh import cmd_eval
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| 17 |
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| 18 | _ = log
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| 19 |
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| 20 | EVAL_NULL = 1
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| 21 | EVAL_DICT = 2
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| 22 |
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| 23 |
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| 24 | class Eval(vm._Callable):
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| 25 | """
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| 26 | These are similar:
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| 27 |
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| 28 | var cmd = ^(echo hi)
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| 29 | call io->eval(cmd)
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| 30 |
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| 31 | Also give the top namespace
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| 32 |
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| 33 | call io->evalToDict(cmd)
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| 34 |
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| 35 | TODO: remove eval (c)
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| 36 |
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| 37 | The CALLER must handle errors.
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| 38 | """
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| 39 |
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| 40 | def __init__(self, cmd_ev, which):
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| 41 | # type: (cmd_eval.CommandEvaluator, int) -> None
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| 42 | self.cmd_ev = cmd_ev
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| 43 | self.which = which
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| 44 |
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| 45 | def Call(self, rd):
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| 46 | # type: (typed_args.Reader) -> value_t
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| 47 | unused = rd.PosValue()
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| 48 | cmd = rd.PosCommand()
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| 49 |
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| 50 | dollar0 = rd.NamedStr("dollar0", None)
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| 51 | pos_args_raw = rd.NamedList("pos_args", None)
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| 52 | vars_ = rd.NamedDict("vars", None)
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| 53 | rd.Done()
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| 54 |
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| 55 | pos_args = None # type: List[str]
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| 56 | if pos_args_raw is not None:
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| 57 | pos_args = []
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| 58 | for arg in pos_args_raw:
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| 59 | if arg.tag() != value_e.Str:
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| 60 | raise error.TypeErr(
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| 61 | arg, "Expected pos_args to be a List of Strs",
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| 62 | rd.LeftParenToken())
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| 63 |
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| 64 | pos_args.append(cast(value.Str, arg).s)
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| 65 |
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| 66 | if self.which == EVAL_NULL:
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| 67 | with state.ctx_Eval(self.cmd_ev.mem, dollar0, pos_args, vars_):
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| 68 | unused_status = self.cmd_ev.EvalCommand(cmd)
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| 69 | return value.Null
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| 70 |
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| 71 | elif self.which == EVAL_DICT:
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| 72 | # TODO: dollar0, pos_args, vars_ not supposed
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| 73 | # Does ctx_FrontFrame has different scoping rules? For "vars"?
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| 74 |
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| 75 | bindings = NewDict() # type: Dict[str, value_t]
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| 76 | with state.ctx_FrontFrame(self.cmd_ev.mem, bindings):
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| 77 | unused_status = self.cmd_ev.EvalCommand(cmd)
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| 78 | return value.Dict(bindings)
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| 79 |
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| 80 | else:
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| 81 | raise AssertionError()
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| 82 |
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| 83 |
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| 84 | class CaptureStdout(vm._Callable):
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| 85 |
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| 86 | def __init__(self, shell_ex):
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| 87 | # type: (vm._Executor) -> None
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| 88 | self.shell_ex = shell_ex
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| 89 |
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| 90 | def Call(self, rd):
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| 91 | # type: (typed_args.Reader) -> value_t
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| 92 |
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| 93 | unused = rd.PosValue()
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| 94 | cmd = rd.PosCommand()
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| 95 | rd.Done() # no more args
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| 96 |
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| 97 | status, stdout_str = self.shell_ex.CaptureStdout(cmd)
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| 98 | if status != 0:
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| 99 | # Note that $() raises error.ErrExit with the status.
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| 100 | # But I think that results in a more confusing error message, so we
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| 101 | # "wrap" the errors.
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| 102 | properties = {
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| 103 | 'status': num.ToBig(status)
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| 104 | } # type: Dict[str, value_t]
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| 105 | raise error.Structured(
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| 106 | 4, 'captureStdout(): command failed with status %d' % status,
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| 107 | rd.LeftParenToken(), properties)
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| 108 |
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| 109 | return value.Str(stdout_str)
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| 110 |
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| 111 |
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| 112 | class PromptVal(vm._Callable):
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| 113 | """
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| 114 | _io->promptVal('$') is like \$
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| 115 | It expands to $ or # when root
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| 116 | """
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| 117 |
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| 118 | def __init__(self, prompt_ev):
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| 119 | # type: (prompt.Evaluator) -> None
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| 120 | self.prompt_ev = prompt_ev
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| 121 |
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| 122 | def Call(self, rd):
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| 123 | # type: (typed_args.Reader) -> value_t
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| 124 |
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| 125 | # "self" param is guaranteed to succeed
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| 126 | unused = rd.PosValue()
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| 127 | what = rd.PosStr()
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| 128 | rd.Done() # no more args
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| 129 |
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| 130 | # Bug fix: protect against crash later in PromptVal()
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| 131 | if len(what) != 1:
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| 132 | raise error.Expr(
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| 133 | 'promptVal() expected a single char, got %r' % what,
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| 134 | rd.LeftParenToken())
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| 135 |
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| 136 | return value.Str(self.prompt_ev.PromptVal(what))
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| 137 |
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| 138 |
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| 139 | # TODO: Implement these
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| 140 |
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| 141 |
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| 142 | class Time(vm._Callable):
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| 143 |
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| 144 | def __init__(self):
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| 145 | # type: () -> None
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| 146 | pass
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| 147 |
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| 148 | def Call(self, rd):
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| 149 | # type: (typed_args.Reader) -> value_t
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| 150 | return value.Null
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| 151 |
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| 152 |
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| 153 | class Strftime(vm._Callable):
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| 154 |
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| 155 | def __init__(self):
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| 156 | # type: () -> None
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| 157 | pass
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| 158 |
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| 159 | def Call(self, rd):
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| 160 | # type: (typed_args.Reader) -> value_t
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| 161 | return value.Null
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| 162 |
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| 163 |
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| 164 | class Glob(vm._Callable):
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| 165 |
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| 166 | def __init__(self):
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| 167 | # type: () -> None
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| 168 | pass
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| 169 |
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| 170 | def Call(self, rd):
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| 171 | # type: (typed_args.Reader) -> value_t
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| 172 | return value.Null
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