| 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_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 vm
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| 9 | from mycpp.mylib import log
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| 10 | from osh import prompt
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| 11 |
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| 12 | from typing import Dict, TYPE_CHECKING
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| 13 | if TYPE_CHECKING:
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| 14 | from frontend import typed_args
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| 15 | from osh import cmd_eval
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| 16 |
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| 17 | _ = log
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| 18 |
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| 19 |
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| 20 | class Eval(vm._Callable):
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| 21 | """
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| 22 | These are similar:
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| 23 |
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| 24 | var c = ^(echo hi)
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| 25 |
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| 26 | eval (c)
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| 27 | call _io->eval(c)
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| 28 |
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| 29 | The CALLER must handle errors.
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| 30 | """
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| 31 |
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| 32 | def __init__(self, cmd_ev):
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| 33 | # type: (cmd_eval.CommandEvaluator) -> None
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| 34 | self.cmd_ev = cmd_ev
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| 35 |
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| 36 | def Call(self, rd):
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| 37 | # type: (typed_args.Reader) -> value_t
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| 38 | unused = rd.PosValue()
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| 39 | cmd = rd.PosCommand()
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| 40 | rd.Done() # no more args
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| 41 |
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| 42 | # errors can arise from false' and 'exit'
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| 43 | unused_status = self.cmd_ev.EvalCommand(cmd)
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| 44 | return value.Null
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| 45 |
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| 46 |
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| 47 | class CaptureStdout(vm._Callable):
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| 48 |
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| 49 | def __init__(self, shell_ex):
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| 50 | # type: (vm._Executor) -> None
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| 51 | self.shell_ex = shell_ex
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| 52 |
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| 53 | def Call(self, rd):
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| 54 | # type: (typed_args.Reader) -> value_t
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| 55 |
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| 56 | unused = rd.PosValue()
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| 57 | cmd = rd.PosCommand()
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| 58 | rd.Done() # no more args
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| 59 |
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| 60 | status, stdout_str = self.shell_ex.CaptureStdout(cmd)
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| 61 | if status != 0:
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| 62 | # Note that $() raises error.ErrExit with the status.
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| 63 | # But I think that results in a more confusing error message, so we
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| 64 | # "wrap" the errors.
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| 65 | properties = {
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| 66 | 'status': num.ToBig(status)
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| 67 | } # type: Dict[str, value_t]
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| 68 | raise error.Structured(
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| 69 | 4, 'captureStdout(): command failed with status %d' % status,
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| 70 | rd.LeftParenToken(), properties)
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| 71 |
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| 72 | return value.Str(stdout_str)
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| 73 |
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| 74 |
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| 75 | class PromptVal(vm._Callable):
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| 76 | """
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| 77 | _io->promptVal('$') is like \$
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| 78 | It expands to $ or # when root
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| 79 | """
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| 80 |
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| 81 | def __init__(self, prompt_ev):
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| 82 | # type: (prompt.Evaluator) -> None
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| 83 | self.prompt_ev = prompt_ev
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| 84 |
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| 85 | def Call(self, rd):
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| 86 | # type: (typed_args.Reader) -> value_t
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| 87 |
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| 88 | # "self" param is guaranteed to succeed
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| 89 | unused = rd.PosValue()
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| 90 | what = rd.PosStr()
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| 91 | rd.Done() # no more args
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| 92 |
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| 93 | # Bug fix: protect against crash later in PromptVal()
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| 94 | if len(what) != 1:
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| 95 | raise error.Expr(
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| 96 | 'promptVal() expected a single char, got %r' % what,
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| 97 | rd.LeftParenToken())
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| 98 |
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| 99 | return value.Str(self.prompt_ev.PromptVal(what))
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| 100 |
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| 101 |
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| 102 | class Time(vm._Callable):
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| 103 |
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| 104 | def __init__(self):
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| 105 | # type: () -> None
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| 106 | pass
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| 107 |
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| 108 | def Call(self, rd):
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| 109 | # type: (typed_args.Reader) -> value_t
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| 110 | return value.Null
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| 111 |
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| 112 |
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| 113 | class Strftime(vm._Callable):
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| 114 |
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| 115 | def __init__(self):
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| 116 | # type: () -> None
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| 117 | pass
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| 118 |
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| 119 | def Call(self, rd):
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| 120 | # type: (typed_args.Reader) -> value_t
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| 121 | return value.Null
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