| 1 | """pyutil.py: Code that's only needed in Python.
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| 2 |
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| 3 | C++ will use other mechanisms.
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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 | import sys
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| 8 | import zipimport # NOT the zipfile module.
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| 9 |
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| 10 | from mycpp import mylib
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| 11 | from pgen2 import grammar
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| 12 | from pylib import os_path
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| 13 |
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| 14 | import posix_ as posix
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| 15 |
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| 16 | from typing import List, Union
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| 17 |
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| 18 | # Copied from 'string' module
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| 19 | _PUNCT = """!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~"""
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| 20 |
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| 21 |
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| 22 | def nan():
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| 23 | # type: () -> float
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| 24 |
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| 25 | # note: Python 3 has math.nan
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| 26 | return float('nan')
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| 27 |
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| 28 |
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| 29 | def infinity():
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| 30 | # type: () -> float
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| 31 |
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| 32 | # note: Python 3 has math.inf
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| 33 | return float('inf')
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| 34 |
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| 35 |
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| 36 | def IsValidCharEscape(ch):
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| 37 | # type: (str) -> bool
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| 38 | """Is this a valid character escape when unquoted?"""
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| 39 | # These punctuation chars never needs to be escaped. (Note that _ is a
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| 40 | # keyword sometimes.)
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| 41 | if ch == '/' or ch == '.' or ch == '-':
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| 42 | return False
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| 43 |
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| 44 | if ch == ' ': # foo\ bar is idiomatic
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| 45 | return True
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| 46 |
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| 47 | # Borderline: ^ and %. But ^ is used for history?
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| 48 | # ! is an operator. And used for history.
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| 49 |
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| 50 | # What about ^(...) or %(...) or /(...) .(1+2), etc.?
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| 51 |
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| 52 | return ch in _PUNCT # like ispunct() in C
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| 53 |
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| 54 |
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| 55 | def ChArrayToString(ch_array):
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| 56 | # type: (List[int]) -> str
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| 57 | """We avoid allocating 1 byte string objects in the C++ implementation.
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| 58 |
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| 59 | 'ch' is short for an integer that represents a character.
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| 60 | """
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| 61 | return ''.join(chr(ch) for ch in ch_array)
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| 62 |
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| 63 |
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| 64 | def BackslashEscape(s, meta_chars):
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| 65 | # type: (str, str) -> str
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| 66 | """Escaped certain characters with backslashes.
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| 67 |
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| 68 | Used for shell syntax (i.e. quoting completed filenames), globs, and
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| 69 | EREs.
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| 70 | """
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| 71 | escaped = []
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| 72 | for c in s:
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| 73 | if c in meta_chars:
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| 74 | escaped.append('\\')
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| 75 | escaped.append(c)
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| 76 | return ''.join(escaped)
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| 77 |
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| 78 |
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| 79 | def strerror(e):
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| 80 | # type: (Union[IOError, OSError]) -> str
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| 81 | return posix.strerror(e.errno)
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| 82 |
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| 83 |
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| 84 | def LoadYshGrammar(loader):
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| 85 | # type: (_ResourceLoader) -> grammar.Grammar
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| 86 | g = grammar.Grammar()
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| 87 | contents = loader.Get('_devbuild/gen/grammar.marshal')
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| 88 | g.loads(contents)
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| 89 | return g
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| 90 |
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| 91 |
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| 92 | class _ResourceLoader(object):
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| 93 |
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| 94 | def Get(self, rel_path):
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| 95 | # type: (str) -> str
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| 96 | raise NotImplementedError()
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| 97 |
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| 98 |
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| 99 | class _FileResourceLoader(_ResourceLoader):
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| 100 | """Open resources relative to argv[0]."""
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| 101 |
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| 102 | def __init__(self, root_dir):
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| 103 | # type: (str) -> None
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| 104 | self.root_dir = root_dir
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| 105 |
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| 106 | def Get(self, rel_path):
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| 107 | # type: (str) -> str
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| 108 | with open(os_path.join(self.root_dir, rel_path)) as f:
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| 109 | contents = f.read()
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| 110 | return contents
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| 111 |
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| 112 |
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| 113 | class _ZipResourceLoader(_ResourceLoader):
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| 114 | """Open resources INSIDE argv[0] as a zip file."""
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| 115 |
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| 116 | def __init__(self, argv0):
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| 117 | # type: (str) -> None
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| 118 | self.z = zipimport.zipimporter(argv0)
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| 119 |
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| 120 | def Get(self, rel_path):
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| 121 | # type: (str) -> str
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| 122 | return self.z.get_data(rel_path)
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| 123 |
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| 124 |
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| 125 | def IsAppBundle():
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| 126 | # type: () -> bool
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| 127 | """Are we running inside the patched version of CPython?
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| 128 |
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| 129 | As opposed to a "stock" Python interpreter.
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| 130 | """
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| 131 | # Ovm_Main in main.c sets this.
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| 132 | return posix.environ.get('_OVM_IS_BUNDLE') == '1'
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| 133 |
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| 134 |
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| 135 | _loader = None # type: _ResourceLoader
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| 136 |
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| 137 |
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| 138 | def GetResourceLoader():
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| 139 | # type: () -> _ResourceLoader
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| 140 | global _loader
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| 141 | if _loader:
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| 142 | return _loader
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| 143 |
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| 144 | if IsAppBundle():
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| 145 | ovm_path = posix.environ.get('_OVM_PATH')
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| 146 | _loader = _ZipResourceLoader(ovm_path)
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| 147 |
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| 148 | # Now clear them so we don't pollute the environment. In Python, this
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| 149 | # calls unsetenv().
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| 150 | del posix.environ['_OVM_IS_BUNDLE']
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| 151 | del posix.environ['_OVM_PATH']
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| 152 |
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| 153 | elif posix.environ.get('_OVM_RESOURCE_ROOT'): # Unit tests set this
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| 154 | root_dir = posix.environ.get('_OVM_RESOURCE_ROOT')
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| 155 | _loader = _FileResourceLoader(root_dir)
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| 156 |
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| 157 | else:
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| 158 | # Find resources relative to the binary, e.g.
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| 159 | # ~/git/oilshell/oil/bin/oil.py. But it also assumes that all unit tests
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| 160 | # that use resources are are one directory deep, e.g. core/util_test.py.
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| 161 | bin_dir = os_path.dirname(os_path.abspath(sys.argv[0]))
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| 162 | root_dir = os_path.join(bin_dir, '..') # ~/git/oilshell/oil
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| 163 | _loader = _FileResourceLoader(root_dir)
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| 164 |
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| 165 | return _loader
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| 166 |
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| 167 |
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| 168 | def GetVersion(loader):
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| 169 | # type: (_ResourceLoader) -> str
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| 170 | contents = loader.Get('oil-version.txt')
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| 171 | version_str, _ = mylib.split_once(contents, '\n')
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| 172 | return version_str
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| 173 |
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| 174 |
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| 175 | def PrintVersionDetails(loader):
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| 176 | # type: (_ResourceLoader) -> None
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| 177 | """Show version and platform information."""
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| 178 | try:
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| 179 | contents = loader.Get('release-date.txt')
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| 180 | release_date, _ = mylib.split_once(contents, '\n')
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| 181 | except IOError:
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| 182 | release_date = '-' # in dev tree
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| 183 |
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| 184 | try:
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| 185 | contents = loader.Get('pyc-version.txt')
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| 186 | pyc_version, _ = mylib.split_once(contents, '\n')
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| 187 | except IOError:
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| 188 | pyc_version = '-' # in dev tree
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| 189 |
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| 190 | # node is like 'hostname'
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| 191 | # release is the kernel version
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| 192 | system, unused_node, unused_release, platform_version, machine = posix.uname(
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| 193 | )
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| 194 |
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| 195 | # The platform.py module has a big regex that parses sys.version, but we
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| 196 | # don't want to depend on regular expressions. So we will do our own parsing
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| 197 | # here.
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| 198 | version_line, py_compiler = sys.version.splitlines()
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| 199 |
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| 200 | # Pick off the first part of '2.7.12 (default, ...)'
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| 201 | py_version = version_line.split()[0]
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| 202 |
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| 203 | assert py_compiler.startswith('['), py_compiler
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| 204 | assert py_compiler.endswith(']'), py_compiler
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| 205 | py_compiler = py_compiler[1:-1]
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| 206 |
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| 207 | # We removed sys.executable from sysmodule.c.
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| 208 | py_impl = 'CPython' if hasattr(sys, 'executable') else 'OVM'
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| 209 |
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| 210 | print('Release Date: %s' % release_date)
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| 211 | print('Arch: %s' % machine)
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| 212 | print('OS: %s' % system)
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| 213 | print('Platform: %s' % platform_version)
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| 214 | print('Compiler: %s' % py_compiler)
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| 215 | print('Interpreter: %s' % py_impl)
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| 216 | print('Interpreter version: %s' % py_version)
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| 217 | print('Bytecode: %s' % pyc_version)
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| 218 |
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| 219 |
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| 220 | # This was useful for debugging.
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| 221 | def ShowFdState():
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| 222 | # type: () -> None
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| 223 | import subprocess
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| 224 | import posix_ as posix
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| 225 | subprocess.call(['ls', '-l', '/proc/%d/fd' % posix.getpid()])
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