| 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 vm
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| 8 | from mycpp.mylib import log
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| 9 | from osh import prompt
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| 10 |
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| 11 | from typing import cast, TYPE_CHECKING
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| 12 | if TYPE_CHECKING:
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| 13 | from frontend import typed_args
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| 14 |
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| 15 | _ = log
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| 16 |
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| 17 |
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| 18 | class PromptVal(vm._Callable):
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| 19 | """
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| 20 | _io->promptVal('$') is like \$
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| 21 | It expands to $ or # when root
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| 22 | """
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| 23 |
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| 24 | def __init__(self):
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| 25 | # type: () -> None
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| 26 | pass
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| 27 |
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| 28 | def Call(self, rd):
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| 29 | # type: (typed_args.Reader) -> value_t
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| 30 |
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| 31 | # "self" param is guaranteed to succeed
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| 32 | io = rd.PosIO()
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| 33 | what = rd.PosStr()
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| 34 | rd.Done() # no more args
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| 35 |
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| 36 | # Bug fix: protect against crash later in PromptVal()
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| 37 | if len(what) != 1:
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| 38 | raise error.Expr(
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| 39 | 'promptVal() expected a single char, got %r' % what,
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| 40 | rd.LeftParenToken())
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| 41 |
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| 42 | prompt_ev = cast(prompt.Evaluator, io.prompt_ev)
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| 43 | return value.Str(prompt_ev.PromptVal(what))
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