| 1 | #!/usr/bin/env python2
|
| 2 | """
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| 3 | val_ops.py
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| 4 | """
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| 5 | from __future__ import print_function
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| 6 |
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| 7 | from _devbuild.gen.syntax_asdl import loc, loc_t, command_t
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| 8 | from _devbuild.gen.value_asdl import (value, value_e, value_t, eggex_ops,
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| 9 | eggex_ops_t, regex_match, RegexMatch)
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| 10 | from core import error
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| 11 | from core import ui
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| 12 | from mycpp import mops
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| 13 | from mycpp.mylib import tagswitch
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| 14 | from ysh import regex_translate
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| 15 |
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| 16 | from typing import TYPE_CHECKING, cast, Dict, List, Optional
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| 17 |
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| 18 | import libc
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| 19 |
|
| 20 | if TYPE_CHECKING:
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| 21 | from core import state
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| 22 |
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| 23 |
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| 24 | def ToInt(val, msg, blame_loc):
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| 25 | # type: (value_t, str, loc_t) -> int
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| 26 | UP_val = val
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| 27 | if val.tag() == value_e.Int:
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| 28 | val = cast(value.Int, UP_val)
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| 29 | return mops.BigTruncate(val.i)
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| 30 |
|
| 31 | raise error.TypeErr(val, msg, blame_loc)
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| 32 |
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| 33 |
|
| 34 | def ToFloat(val, msg, blame_loc):
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| 35 | # type: (value_t, str, loc_t) -> float
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| 36 | UP_val = val
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| 37 | if val.tag() == value_e.Float:
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| 38 | val = cast(value.Float, UP_val)
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| 39 | return val.f
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| 40 |
|
| 41 | raise error.TypeErr(val, msg, blame_loc)
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| 42 |
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| 43 |
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| 44 | def ToStr(val, msg, blame_loc):
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| 45 | # type: (value_t, str, loc_t) -> str
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| 46 | UP_val = val
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| 47 | if val.tag() == value_e.Str:
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| 48 | val = cast(value.Str, UP_val)
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| 49 | return val.s
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| 50 |
|
| 51 | raise error.TypeErr(val, msg, blame_loc)
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| 52 |
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| 53 |
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| 54 | def ToList(val, msg, blame_loc):
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| 55 | # type: (value_t, str, loc_t) -> List[value_t]
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| 56 | UP_val = val
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| 57 | if val.tag() == value_e.List:
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| 58 | val = cast(value.List, UP_val)
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| 59 | return val.items
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| 60 |
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| 61 | raise error.TypeErr(val, msg, blame_loc)
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| 62 |
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| 63 |
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| 64 | def ToDict(val, msg, blame_loc):
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| 65 | # type: (value_t, str, loc_t) -> Dict[str, value_t]
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| 66 | UP_val = val
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| 67 | if val.tag() == value_e.Dict:
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| 68 | val = cast(value.Dict, UP_val)
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| 69 | return val.d
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| 70 |
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| 71 | raise error.TypeErr(val, msg, blame_loc)
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| 72 |
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| 73 |
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| 74 | def ToCommand(val, msg, blame_loc):
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| 75 | # type: (value_t, str, loc_t) -> command_t
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| 76 | UP_val = val
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| 77 | if val.tag() == value_e.Command:
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| 78 | val = cast(value.Command, UP_val)
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| 79 | return val.c
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| 80 |
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| 81 | raise error.TypeErr(val, msg, blame_loc)
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| 82 |
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| 83 |
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| 84 | def Stringify(val, blame_loc, prefix=''):
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| 85 | # type: (value_t, loc_t, str) -> str
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| 86 | """
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| 87 | Used by
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| 88 |
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| 89 | $[x] stringify operator
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| 90 | @[x] expression splice - each element is stringified
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| 91 | @x splice value
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| 92 | """
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| 93 | if blame_loc is None:
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| 94 | blame_loc = loc.Missing
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| 95 |
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| 96 | UP_val = val
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| 97 | with tagswitch(val) as case:
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| 98 | if case(value_e.Str): # trivial case
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| 99 | val = cast(value.Str, UP_val)
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| 100 | return val.s
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| 101 |
|
| 102 | elif case(value_e.Null):
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| 103 | s = 'null' # JSON spelling
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| 104 |
|
| 105 | elif case(value_e.Bool):
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| 106 | val = cast(value.Bool, UP_val)
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| 107 | s = 'true' if val.b else 'false' # JSON spelling
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| 108 |
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| 109 | elif case(value_e.Int):
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| 110 | val = cast(value.Int, UP_val)
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| 111 | # e.g. decimal '42', the only sensible representation
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| 112 | s = mops.ToStr(val.i)
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| 113 |
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| 114 | elif case(value_e.Float):
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| 115 | val = cast(value.Float, UP_val)
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| 116 | # TODO: what precision does this have?
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| 117 | # The default could be like awk or Python, and then we also allow
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| 118 | # ${myfloat %.3f} and more.
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| 119 | # Python 3 seems to give a few more digits than Python 2 for str(1.0/3)
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| 120 | s = str(val.f)
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| 121 |
|
| 122 | elif case(value_e.Eggex):
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| 123 | val = cast(value.Eggex, UP_val)
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| 124 | s = regex_translate.AsPosixEre(val) # lazily converts to ERE
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| 125 |
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| 126 | elif case(value_e.List):
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| 127 | raise error.TypeErrVerbose(
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| 128 | "%sgot a List, which can't be stringified. Perhaps use @ instead of $, or use join()"
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| 129 | % prefix, blame_loc)
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| 130 |
|
| 131 | else:
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| 132 | raise error.TypeErr(
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| 133 | val, "%sexpected Null, Bool, Int, Float, Eggex" % prefix,
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| 134 | blame_loc)
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| 135 |
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| 136 | return s
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| 137 |
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| 138 |
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| 139 | def ToShellArray(val, blame_loc, prefix=''):
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| 140 | # type: (value_t, loc_t, str) -> List[str]
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| 141 | """
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| 142 | Used by
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| 143 |
|
| 144 | @[x] expression splice
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| 145 | @x splice value
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| 146 |
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| 147 | Dicts do NOT get spliced, but they iterate over their keys
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| 148 | So this function NOT use Iterator.
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| 149 | """
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| 150 | UP_val = val
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| 151 | with tagswitch(val) as case2:
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| 152 | if case2(value_e.List):
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| 153 | val = cast(value.List, UP_val)
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| 154 | strs = [] # type: List[str]
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| 155 | # Note: it would be nice to add the index to the error message
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| 156 | # prefix, WITHOUT allocating a string for every item
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| 157 | for item in val.items:
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| 158 | strs.append(Stringify(item, blame_loc, prefix=prefix))
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| 159 |
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| 160 | # I thought about getting rid of this to keep OSH and YSH separate,
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| 161 | # but:
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| 162 | # - readarray/mapfile returns bash array (ysh-user-feedback depends on it)
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| 163 | # - ysh-options tests parse_at too
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| 164 | elif case2(value_e.BashArray):
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| 165 | val = cast(value.BashArray, UP_val)
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| 166 | strs = val.strs
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| 167 |
|
| 168 | else:
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| 169 | raise error.TypeErr(val, "%sexpected List" % prefix, blame_loc)
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| 170 |
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| 171 | return strs
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| 172 |
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| 173 |
|
| 174 | class _ContainerIter(object):
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| 175 | """Interface for various types of for loop."""
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| 176 |
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| 177 | def __init__(self):
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| 178 | # type: () -> None
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| 179 | self.i = 0
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| 180 |
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| 181 | def Index(self):
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| 182 | # type: () -> int
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| 183 | return self.i
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| 184 |
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| 185 | def Next(self):
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| 186 | # type: () -> None
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| 187 | self.i += 1
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| 188 |
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| 189 | def Done(self):
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| 190 | # type: () -> int
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| 191 | raise NotImplementedError()
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| 192 |
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| 193 | def FirstValue(self):
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| 194 | # type: () -> value_t
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| 195 | """Return Dict key or List value"""
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| 196 | raise NotImplementedError()
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| 197 |
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| 198 | def SecondValue(self):
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| 199 | # type: () -> value_t
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| 200 | """Return Dict value or FAIL"""
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| 201 | raise AssertionError("Shouldn't have called this")
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| 202 |
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| 203 |
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| 204 | class ArrayIter(_ContainerIter):
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| 205 | """ for x in 1 2 3 { """
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| 206 |
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| 207 | def __init__(self, strs):
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| 208 | # type: (List[str]) -> None
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| 209 | _ContainerIter.__init__(self)
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| 210 | self.strs = strs
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| 211 | self.n = len(strs)
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| 212 |
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| 213 | def Done(self):
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| 214 | # type: () -> int
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| 215 | return self.i == self.n
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| 216 |
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| 217 | def FirstValue(self):
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| 218 | # type: () -> value_t
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| 219 | return value.Str(self.strs[self.i])
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| 220 |
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| 221 |
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| 222 | class RangeIterator(_ContainerIter):
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| 223 | """ for x in (m:n) { """
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| 224 |
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| 225 | def __init__(self, val):
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| 226 | # type: (value.Range) -> None
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| 227 | _ContainerIter.__init__(self)
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| 228 | self.val = val
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| 229 |
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| 230 | def Done(self):
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| 231 | # type: () -> int
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| 232 | return self.val.lower + self.i >= self.val.upper
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| 233 |
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| 234 | def FirstValue(self):
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| 235 | # type: () -> value_t
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| 236 |
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| 237 | # TODO: range should be BigInt too
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| 238 | return value.Int(mops.IntWiden(self.val.lower + self.i))
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| 239 |
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| 240 |
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| 241 | class ListIterator(_ContainerIter):
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| 242 | """ for x in (mylist) { """
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| 243 |
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| 244 | def __init__(self, val):
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| 245 | # type: (value.List) -> None
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| 246 | _ContainerIter.__init__(self)
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| 247 | self.val = val
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| 248 | self.n = len(val.items)
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| 249 |
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| 250 | def Done(self):
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| 251 | # type: () -> int
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| 252 | return self.i == self.n
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| 253 |
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| 254 | def FirstValue(self):
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| 255 | # type: () -> value_t
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| 256 | return self.val.items[self.i]
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| 257 |
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| 258 |
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| 259 | class DictIterator(_ContainerIter):
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| 260 | """ for x in (mydict) { """
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| 261 |
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| 262 | def __init__(self, val):
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| 263 | # type: (value.Dict) -> None
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| 264 | _ContainerIter.__init__(self)
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| 265 |
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| 266 | # TODO: Don't materialize these Lists
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| 267 | self.keys = val.d.keys() # type: List[str]
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| 268 | self.values = val.d.values() # type: List[value_t]
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| 269 |
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| 270 | self.n = len(val.d)
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| 271 | assert self.n == len(self.keys)
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| 272 |
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| 273 | def Done(self):
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| 274 | # type: () -> int
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| 275 | return self.i == self.n
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| 276 |
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| 277 | def FirstValue(self):
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| 278 | # type: () -> value_t
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| 279 | return value.Str(self.keys[self.i])
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| 280 |
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| 281 | def SecondValue(self):
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| 282 | # type: () -> value_t
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| 283 | return self.values[self.i]
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| 284 |
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| 285 |
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| 286 | def ToBool(val):
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| 287 | # type: (value_t) -> bool
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| 288 | """Convert any value to a boolean.
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| 289 |
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| 290 | TODO: expose this as Bool(x), like Python's bool(x).
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| 291 | """
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| 292 | UP_val = val
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| 293 | with tagswitch(val) as case:
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| 294 | if case(value_e.Undef):
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| 295 | return False
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| 296 |
|
| 297 | elif case(value_e.Null):
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| 298 | return False
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| 299 |
|
| 300 | elif case(value_e.Str):
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| 301 | val = cast(value.Str, UP_val)
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| 302 | return len(val.s) != 0
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| 303 |
|
| 304 | # OLD TYPES
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| 305 | elif case(value_e.BashArray):
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| 306 | val = cast(value.BashArray, UP_val)
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| 307 | return len(val.strs) != 0
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| 308 |
|
| 309 | elif case(value_e.BashAssoc):
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| 310 | val = cast(value.BashAssoc, UP_val)
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| 311 | return len(val.d) != 0
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| 312 |
|
| 313 | elif case(value_e.Bool):
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| 314 | val = cast(value.Bool, UP_val)
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| 315 | return val.b
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| 316 |
|
| 317 | elif case(value_e.Int):
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| 318 | val = cast(value.Int, UP_val)
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| 319 | return not mops.Equal(val.i, mops.BigInt(0))
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| 320 |
|
| 321 | elif case(value_e.Float):
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| 322 | val = cast(value.Float, UP_val)
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| 323 | return val.f != 0.0
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| 324 |
|
| 325 | elif case(value_e.List):
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| 326 | val = cast(value.List, UP_val)
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| 327 | return len(val.items) > 0
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| 328 |
|
| 329 | elif case(value_e.Dict):
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| 330 | val = cast(value.Dict, UP_val)
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| 331 | return len(val.d) > 0
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| 332 |
|
| 333 | else:
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| 334 | return True # all other types are Truthy
|
| 335 |
|
| 336 |
|
| 337 | def ExactlyEqual(left, right, blame_loc):
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| 338 | # type: (value_t, value_t, loc_t) -> bool
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| 339 | if left.tag() != right.tag():
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| 340 | return False
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| 341 |
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| 342 | UP_left = left
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| 343 | UP_right = right
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| 344 | with tagswitch(left) as case:
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| 345 | if case(value_e.Undef):
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| 346 | return True # there's only one Undef
|
| 347 |
|
| 348 | elif case(value_e.Null):
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| 349 | return True # there's only one Null
|
| 350 |
|
| 351 | elif case(value_e.Bool):
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| 352 | left = cast(value.Bool, UP_left)
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| 353 | right = cast(value.Bool, UP_right)
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| 354 | return left.b == right.b
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| 355 |
|
| 356 | elif case(value_e.Int):
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| 357 | left = cast(value.Int, UP_left)
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| 358 | right = cast(value.Int, UP_right)
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| 359 | return mops.Equal(left.i, right.i)
|
| 360 |
|
| 361 | elif case(value_e.Float):
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| 362 | # Note: could provide floatEquals(), and suggest it
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| 363 | # Suggested idiom is abs(f1 - f2) < 0.1
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| 364 | raise error.TypeErrVerbose("Equality isn't defined on Float",
|
| 365 | blame_loc)
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| 366 |
|
| 367 | elif case(value_e.Str):
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| 368 | left = cast(value.Str, UP_left)
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| 369 | right = cast(value.Str, UP_right)
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| 370 | return left.s == right.s
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| 371 |
|
| 372 | elif case(value_e.BashArray):
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| 373 | left = cast(value.BashArray, UP_left)
|
| 374 | right = cast(value.BashArray, UP_right)
|
| 375 | if len(left.strs) != len(right.strs):
|
| 376 | return False
|
| 377 |
|
| 378 | for i in xrange(0, len(left.strs)):
|
| 379 | if left.strs[i] != right.strs[i]:
|
| 380 | return False
|
| 381 |
|
| 382 | return True
|
| 383 |
|
| 384 | elif case(value_e.List):
|
| 385 | left = cast(value.List, UP_left)
|
| 386 | right = cast(value.List, UP_right)
|
| 387 | if len(left.items) != len(right.items):
|
| 388 | return False
|
| 389 |
|
| 390 | for i in xrange(0, len(left.items)):
|
| 391 | if not ExactlyEqual(left.items[i], right.items[i], blame_loc):
|
| 392 | return False
|
| 393 |
|
| 394 | return True
|
| 395 |
|
| 396 | elif case(value_e.BashAssoc):
|
| 397 | left = cast(value.Dict, UP_left)
|
| 398 | right = cast(value.Dict, UP_right)
|
| 399 | if len(left.d) != len(right.d):
|
| 400 | return False
|
| 401 |
|
| 402 | for k in left.d.keys():
|
| 403 | if k not in right.d or right.d[k] != left.d[k]:
|
| 404 | return False
|
| 405 |
|
| 406 | return True
|
| 407 |
|
| 408 | elif case(value_e.Dict):
|
| 409 | left = cast(value.Dict, UP_left)
|
| 410 | right = cast(value.Dict, UP_right)
|
| 411 | if len(left.d) != len(right.d):
|
| 412 | return False
|
| 413 |
|
| 414 | for k in left.d.keys():
|
| 415 | if (k not in right.d or
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| 416 | not ExactlyEqual(right.d[k], left.d[k], blame_loc)):
|
| 417 | return False
|
| 418 |
|
| 419 | return True
|
| 420 |
|
| 421 | raise error.TypeErrVerbose(
|
| 422 | "Can't compare two values of type %s" % ui.ValType(left), blame_loc)
|
| 423 |
|
| 424 |
|
| 425 | def Contains(needle, haystack):
|
| 426 | # type: (value_t, value_t) -> bool
|
| 427 | """Haystack must be a Dict.
|
| 428 |
|
| 429 | We should have mylist->find(x) !== -1 for searching through a List.
|
| 430 | Things with different perf characteristics should look different.
|
| 431 | """
|
| 432 | UP_haystack = haystack
|
| 433 | with tagswitch(haystack) as case:
|
| 434 | if case(value_e.Dict):
|
| 435 | haystack = cast(value.Dict, UP_haystack)
|
| 436 | s = ToStr(needle, "LHS of 'in' should be Str", loc.Missing)
|
| 437 | return s in haystack.d
|
| 438 |
|
| 439 | else:
|
| 440 | raise error.TypeErr(haystack, "RHS of 'in' should be Dict",
|
| 441 | loc.Missing)
|
| 442 |
|
| 443 | return False
|
| 444 |
|
| 445 |
|
| 446 | def MatchRegex(left, right, mem):
|
| 447 | # type: (value_t, value_t, Optional[state.Mem]) -> bool
|
| 448 | """
|
| 449 | Args:
|
| 450 | mem: Whether to set or clear matches
|
| 451 | """
|
| 452 | UP_right = right
|
| 453 |
|
| 454 | with tagswitch(right) as case:
|
| 455 | if case(value_e.Str): # plain ERE
|
| 456 | right = cast(value.Str, UP_right)
|
| 457 |
|
| 458 | right_s = right.s
|
| 459 | regex_flags = 0
|
| 460 | capture = eggex_ops.No # type: eggex_ops_t
|
| 461 |
|
| 462 | elif case(value_e.Eggex):
|
| 463 | right = cast(value.Eggex, UP_right)
|
| 464 |
|
| 465 | right_s = regex_translate.AsPosixEre(right)
|
| 466 | regex_flags = regex_translate.LibcFlags(right.canonical_flags)
|
| 467 | capture = eggex_ops.Yes(right.convert_funcs, right.convert_toks,
|
| 468 | right.capture_names)
|
| 469 |
|
| 470 | else:
|
| 471 | raise error.TypeErr(right, 'Expected Str or Regex for RHS of ~',
|
| 472 | loc.Missing)
|
| 473 |
|
| 474 | UP_left = left
|
| 475 | left_s = None # type: str
|
| 476 | with tagswitch(left) as case:
|
| 477 | if case(value_e.Str):
|
| 478 | left = cast(value.Str, UP_left)
|
| 479 | left_s = left.s
|
| 480 | else:
|
| 481 | raise error.TypeErrVerbose('LHS must be a string', loc.Missing)
|
| 482 |
|
| 483 | indices = libc.regex_search(right_s, regex_flags, left_s, 0)
|
| 484 | if indices is not None:
|
| 485 | if mem:
|
| 486 | mem.SetRegexMatch(RegexMatch(left_s, indices, capture))
|
| 487 | return True
|
| 488 | else:
|
| 489 | if mem:
|
| 490 | mem.SetRegexMatch(regex_match.No)
|
| 491 | return False
|
| 492 |
|
| 493 |
|
| 494 | # vim: sw=4
|