| 1 | #t!/usr/bin/env python2
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| 2 | # Copyright 2016 Andy Chu. All rights reserved.
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| 3 | # Licensed under the Apache License, Version 2.0 (the "License");
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| 4 | # you may not use this file except in compliance with the License.
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| 5 | # You may obtain a copy of the License at
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| 6 | #
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| 7 | # http://www.apache.org/licenses/LICENSE-2.0
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| 8 | """
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| 9 | util.py - Common infrastructure.
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| 10 | """
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| 11 | from __future__ import print_function
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| 12 |
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| 13 | from display import ansi
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| 14 | from core import pyutil
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| 15 | from mycpp import mylib
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| 16 |
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| 17 | import libc
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| 18 |
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| 19 | from typing import List, Optional
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| 20 |
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| 21 |
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| 22 | def RegexGroupStrings(s, indices):
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| 23 | # type: (str, List[int]) -> List[str]
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| 24 | """
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| 25 | For BASH_REMATCH: returns empty string for unmatched group
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| 26 | """
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| 27 | groups = [] # type: List[str]
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| 28 | n = len(indices)
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| 29 | for i in xrange(n / 2):
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| 30 | start = indices[2 * i]
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| 31 | end = indices[2 * i + 1]
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| 32 | if start == -1:
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| 33 | groups.append('')
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| 34 | else:
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| 35 | groups.append(s[start:end])
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| 36 | return groups
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| 37 |
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| 38 |
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| 39 | def RegexSearch(pat, s):
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| 40 | # type: (str, str) -> Optional[List[str]]
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| 41 | """Search a string for pattern.
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| 42 |
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| 43 | Return None for no match, or a list of groups that match. Used for some
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| 44 | runtime parsing.
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| 45 | """
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| 46 | indices = libc.regex_search(pat, 0, s, 0)
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| 47 | if indices is None:
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| 48 | return None
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| 49 | return RegexGroupStrings(s, indices)
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| 50 |
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| 51 |
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| 52 | class UserExit(Exception):
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| 53 | """For explicit 'exit'."""
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| 54 |
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| 55 | def __init__(self, status):
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| 56 | # type: (int) -> None
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| 57 | self.status = status
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| 58 |
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| 59 |
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| 60 | class HistoryError(Exception):
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| 61 |
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| 62 | def __init__(self, msg):
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| 63 | # type: (str) -> None
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| 64 | self.msg = msg
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| 65 |
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| 66 | def UserErrorString(self):
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| 67 | # type: () -> str
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| 68 | return 'history: %s' % self.msg
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| 69 |
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| 70 |
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| 71 | class _DebugFile(object):
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| 72 |
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| 73 | def __init__(self):
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| 74 | # type: () -> None
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| 75 | pass
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| 76 |
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| 77 | def write(self, s):
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| 78 | # type: (str) -> None
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| 79 | pass
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| 80 |
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| 81 | def writeln(self, s):
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| 82 | # type: (str) -> None
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| 83 | pass
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| 84 |
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| 85 | def isatty(self):
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| 86 | # type: () -> bool
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| 87 | return False
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| 88 |
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| 89 |
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| 90 | class NullDebugFile(_DebugFile):
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| 91 |
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| 92 | def __init__(self):
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| 93 | # type: () -> None
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| 94 | """Empty constructor for mycpp."""
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| 95 | _DebugFile.__init__(self)
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| 96 |
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| 97 |
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| 98 | class DebugFile(_DebugFile):
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| 99 | """Trivial wrapper with writeln() method
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| 100 |
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| 101 | Can we turn this into a plain mylib::File? Right now that type only exists
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| 102 | in C++, but it should probably exist in Python too.
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| 103 | """
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| 104 |
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| 105 | def __init__(self, f):
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| 106 | # type: (mylib.Writer) -> None
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| 107 | _DebugFile.__init__(self)
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| 108 | self.f = f
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| 109 |
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| 110 | def write(self, s):
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| 111 | # type: (str) -> None
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| 112 | """Used by dev::Tracer and ASDL node.PrettyPrint()."""
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| 113 | self.f.write(s)
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| 114 |
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| 115 | def writeln(self, s):
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| 116 | # type: (str) -> None
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| 117 | self.write(s + '\n')
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| 118 | self.f.flush()
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| 119 |
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| 120 | def isatty(self):
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| 121 | # type: () -> bool
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| 122 | """Used by node.PrettyPrint()."""
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| 123 | return self.f.isatty()
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| 124 |
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| 125 |
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| 126 | def PrintTopicHeader(topic_id, f):
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| 127 | # type: (str, mylib.Writer) -> None
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| 128 | if f.isatty():
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| 129 | f.write('%s %s %s\n' % (ansi.REVERSE, topic_id, ansi.RESET))
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| 130 | else:
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| 131 | f.write('~~~ %s ~~~\n' % topic_id)
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| 132 |
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| 133 | f.write('\n')
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| 134 |
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| 135 |
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| 136 | def PrintEmbeddedHelp(loader, topic_id, f):
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| 137 | # type: (pyutil._ResourceLoader, str, mylib.Writer) -> bool
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| 138 | try:
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| 139 | contents = loader.Get('_devbuild/help/%s' % topic_id)
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| 140 | except (IOError, OSError):
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| 141 | return False
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| 142 |
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| 143 | PrintTopicHeader(topic_id, f)
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| 144 | f.write(contents)
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| 145 | f.write('\n')
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| 146 | return True # found
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| 147 |
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| 148 |
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| 149 | def _PrintVersionLine(loader, f):
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| 150 | # type: (pyutil._ResourceLoader, mylib.Writer) -> None
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| 151 | v = pyutil.GetVersion(loader)
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| 152 | f.write('Oils %s\t\thttps://www.oilshell.org/\n' % v)
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| 153 |
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| 154 |
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| 155 | def HelpFlag(loader, topic_id, f):
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| 156 | # type: (pyutil._ResourceLoader, str, mylib.Writer) -> None
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| 157 | _PrintVersionLine(loader, f)
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| 158 | f.write('\n')
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| 159 | found = PrintEmbeddedHelp(loader, topic_id, f)
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| 160 | # Note: could assert this in C++ too
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| 161 | assert found, 'Missing %s' % topic_id
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| 162 |
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| 163 |
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| 164 | def VersionFlag(loader, f):
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| 165 | # type: (pyutil._ResourceLoader, mylib.Writer) -> None
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| 166 | _PrintVersionLine(loader, f)
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| 167 | f.write('\n')
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| 168 | pyutil.PrintVersionDetails(loader)
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