| 1 | #!/usr/bin/env python2
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| 2 | """Consts.py."""
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| 3 | from __future__ import print_function
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| 4 |
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| 5 | from _devbuild.gen.types_asdl import (redir_arg_type_e, redir_arg_type_t,
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| 6 | bool_arg_type_t, opt_group_i)
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| 7 | from _devbuild.gen.id_kind_asdl import Id, Id_t, Kind_t
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| 8 | from frontend import builtin_def
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| 9 | from frontend import lexer_def
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| 10 | from frontend import option_def
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| 11 |
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| 12 | from typing import Tuple, Optional, TYPE_CHECKING
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| 13 | if TYPE_CHECKING:
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| 14 | from _devbuild.gen.option_asdl import option_t, builtin_t
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| 15 |
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| 16 | NO_INDEX = 0 # for Resolve
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| 17 |
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| 18 | # Used as consts::STRICT_ALL, etc. Do it explicitly to satisfy MyPy.
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| 19 | STRICT_ALL = option_def.STRICT_ALL
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| 20 | YSH_UPGRADE = option_def.YSH_UPGRADE
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| 21 | YSH_ALL = option_def.YSH_ALL
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| 22 | DEFAULT_TRUE = option_def.DEFAULT_TRUE
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| 23 |
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| 24 | PARSE_OPTION_NUMS = option_def.PARSE_OPTION_NUMS
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| 25 |
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| 26 | SET_OPTION_NUMS = [
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| 27 | opt.index for opt in option_def._SORTED if opt.builtin == 'set'
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| 28 | ]
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| 29 | SET_OPTION_NAMES = [
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| 30 | opt.name for opt in option_def._SORTED if opt.builtin == 'set'
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| 31 | ]
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| 32 |
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| 33 | SHOPT_OPTION_NUMS = [
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| 34 | opt.index for opt in option_def._SORTED if opt.builtin == 'shopt'
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| 35 | ]
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| 36 | SHOPT_OPTION_NAMES = [
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| 37 | opt.name for opt in option_def._SORTED if opt.builtin == 'shopt'
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| 38 | ]
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| 39 |
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| 40 | VISIBLE_SHOPT_NUMS = option_def.VISIBLE_SHOPT_NUMS # used to print
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| 41 |
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| 42 | BUILTIN_NAMES = builtin_def.BUILTIN_NAMES # Used by builtin_comp.py
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| 43 |
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| 44 | # Keywords for introspection with bash 'compgen' and 'type'
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| 45 | OSH_KEYWORD_NAMES = [name for _, name, _ in lexer_def.KEYWORDS]
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| 46 | OSH_KEYWORD_NAMES.append('{') # not handled by our lexer
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| 47 | OSH_KEYWORD_NAMES.append('=') # YSH keyword not handled by our lexer
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| 48 |
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| 49 | # bash considers these closing delimiters keywords
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| 50 | OSH_KEYWORD_NAMES.append('}')
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| 51 | OSH_KEYWORD_NAMES.append(']]')
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| 52 |
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| 53 |
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| 54 | def GetKind(id_):
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| 55 | # type: (Id_t) -> Kind_t
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| 56 | """To make coarse-grained parsing decisions."""
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| 57 |
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| 58 | from _devbuild.gen.id_kind import ID_TO_KIND # break circular dep
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| 59 | return ID_TO_KIND[id_]
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| 60 |
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| 61 |
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| 62 | def BoolArgType(id_):
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| 63 | # type: (Id_t) -> bool_arg_type_t
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| 64 |
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| 65 | from _devbuild.gen.id_kind import BOOL_ARG_TYPES # break circular dep
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| 66 | return BOOL_ARG_TYPES[id_]
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| 67 |
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| 68 |
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| 69 | #
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| 70 | # Redirect Tables associated with IDs
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| 71 | #
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| 72 |
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| 73 | REDIR_DEFAULT_FD = {
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| 74 | # filename
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| 75 | Id.Redir_Less: 0, # cat <input.txt means cat 0<input.txt
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| 76 | Id.Redir_Great: 1,
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| 77 | Id.Redir_DGreat: 1,
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| 78 | Id.Redir_Clobber: 1,
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| 79 | Id.Redir_LessGreat: 0, # 'exec <> foo' opens a file with read/write
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| 80 | # bash &> and &>>
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| 81 | Id.Redir_AndGreat: 1,
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| 82 | Id.Redir_AndDGreat: 1,
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| 83 |
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| 84 | # descriptor
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| 85 | Id.Redir_GreatAnd: 1, # echo >&2 means echo 1>&2
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| 86 | Id.Redir_LessAnd: 0, # echo <&3 means echo 0<&3, I think
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| 87 | Id.Redir_TLess: 0, # here word
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| 88 |
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| 89 | # here docs included
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| 90 | Id.Redir_DLess: 0,
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| 91 | Id.Redir_DLessDash: 0,
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| 92 | }
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| 93 |
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| 94 | REDIR_ARG_TYPES = {
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| 95 | # filename
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| 96 | Id.Redir_Less: redir_arg_type_e.Path,
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| 97 | Id.Redir_Great: redir_arg_type_e.Path,
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| 98 | Id.Redir_DGreat: redir_arg_type_e.Path,
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| 99 | Id.Redir_Clobber: redir_arg_type_e.Path,
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| 100 | Id.Redir_LessGreat: redir_arg_type_e.Path,
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| 101 | # bash &> and &>>
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| 102 | Id.Redir_AndGreat: redir_arg_type_e.Path,
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| 103 | Id.Redir_AndDGreat: redir_arg_type_e.Path,
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| 104 |
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| 105 | # descriptor
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| 106 | Id.Redir_GreatAnd: redir_arg_type_e.Desc,
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| 107 | Id.Redir_LessAnd: redir_arg_type_e.Desc,
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| 108 | Id.Redir_TLess: redir_arg_type_e.Here, # here word
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| 109 | # note: here docs aren't included
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| 110 | }
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| 111 |
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| 112 |
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| 113 | def RedirArgType(id_):
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| 114 | # type: (Id_t) -> redir_arg_type_t
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| 115 | return REDIR_ARG_TYPES[id_]
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| 116 |
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| 117 |
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| 118 | def RedirDefaultFd(id_):
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| 119 | # type: (Id_t) -> int
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| 120 | return REDIR_DEFAULT_FD[id_]
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| 121 |
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| 122 |
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| 123 | #
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| 124 | # Builtins
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| 125 | #
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| 126 |
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| 127 | _BUILTIN_DICT = builtin_def.BuiltinDict()
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| 128 |
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| 129 |
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| 130 | def LookupSpecialBuiltin(argv0):
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| 131 | # type: (str) -> builtin_t
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| 132 | """Is it a special builtin?"""
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| 133 | b = _BUILTIN_DICT.get(argv0)
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| 134 | if b and b.kind == 'special':
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| 135 | return b.index
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| 136 | else:
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| 137 | return NO_INDEX
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| 138 |
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| 139 |
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| 140 | def LookupAssignBuiltin(argv0):
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| 141 | # type: (str) -> builtin_t
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| 142 | """Is it an assignment builtin?"""
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| 143 | b = _BUILTIN_DICT.get(argv0)
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| 144 | if b and b.kind == 'assign':
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| 145 | return b.index
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| 146 | else:
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| 147 | return NO_INDEX
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| 148 |
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| 149 |
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| 150 | def LookupNormalBuiltin(argv0):
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| 151 | # type: (str) -> builtin_t
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| 152 | """Is it any other builtin?"""
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| 153 | b = _BUILTIN_DICT.get(argv0)
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| 154 | if b and b.kind == 'normal':
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| 155 | return b.index
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| 156 | else:
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| 157 | return NO_INDEX
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| 158 |
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| 159 |
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| 160 | def OptionName(opt_num):
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| 161 | # type: (option_t) -> str
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| 162 | """Get the name from an index."""
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| 163 | return option_def.OPTION_NAMES[opt_num]
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| 164 |
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| 165 |
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| 166 | OPTION_GROUPS = {
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| 167 | 'strict:all': opt_group_i.StrictAll,
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| 168 |
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| 169 | # Aliases to deprecate
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| 170 | 'oil:upgrade': opt_group_i.YshUpgrade,
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| 171 | 'oil:all': opt_group_i.YshAll,
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| 172 | 'ysh:upgrade': opt_group_i.YshUpgrade,
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| 173 | 'ysh:all': opt_group_i.YshAll,
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| 174 | }
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| 175 |
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| 176 |
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| 177 | def OptionGroupNum(s):
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| 178 | # type: (str) -> int
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| 179 | return OPTION_GROUPS.get(s, NO_INDEX) # 0 for not found
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| 180 |
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| 181 |
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| 182 | _OPTION_DICT = option_def.OptionDict()
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| 183 |
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| 184 |
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| 185 | def OptionNum(s):
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| 186 | # type: (str) -> int
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| 187 | return _OPTION_DICT.get(s, 0) # 0 means not found
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| 188 |
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| 189 |
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| 190 | _CONTROL_FLOW_NAMES = [name for _, name, _ in lexer_def.CONTROL_FLOW]
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| 191 | _CONTROL_FLOW_LOOKUP = {}
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| 192 | for _, name, id_ in lexer_def.CONTROL_FLOW:
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| 193 | _CONTROL_FLOW_LOOKUP[id_] = name
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| 194 |
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| 195 |
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| 196 | def ControlFlowName(id_):
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| 197 | # type: (int) -> str
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| 198 | """For tracing"""
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| 199 | return _CONTROL_FLOW_LOOKUP[id_]
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| 200 |
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| 201 |
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| 202 | def IsControlFlow(name):
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| 203 | # type: (str) -> bool
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| 204 | return name in _CONTROL_FLOW_NAMES
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| 205 |
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| 206 |
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| 207 | def IsKeyword(name):
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| 208 | # type: (str) -> bool
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| 209 | return name in OSH_KEYWORD_NAMES
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| 210 |
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| 211 |
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| 212 | #
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| 213 | # osh/prompt.py and osh/word_compile.py
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| 214 | #
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| 215 |
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| 216 | _ONE_CHAR_C = {
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| 217 | '0': '\0',
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| 218 | 'a': '\a',
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| 219 | 'b': '\b',
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| 220 | 'e': '\x1b',
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| 221 | 'E': '\x1b',
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| 222 | 'f': '\f',
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| 223 | 'n': '\n',
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| 224 | 'r': '\r',
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| 225 | 't': '\t',
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| 226 | 'v': '\v',
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| 227 | '\\': '\\',
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| 228 | "'": "'", # for $'' only, not echo -e
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| 229 | '"': '"', # not sure why this is escaped within $''
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| 230 | '/': '/', # for JSON \/ only
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| 231 | }
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| 232 |
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| 233 |
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| 234 | def LookupCharC(c):
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| 235 | # type: (str) -> str
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| 236 | """Fatal if not present."""
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| 237 | return _ONE_CHAR_C[c]
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| 238 |
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| 239 |
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| 240 | # NOTE: Prompts chars and printf are inconsistent, e.g. \E is \e in printf, but
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| 241 | # not in PS1.
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| 242 | _ONE_CHAR_PROMPT = {
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| 243 | 'a': '\a',
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| 244 | 'e': '\x1b',
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| 245 | 'r': '\r',
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| 246 | 'n': '\n',
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| 247 | '\\': '\\',
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| 248 | }
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| 249 |
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| 250 |
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| 251 | def LookupCharPrompt(c):
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| 252 | # type: (str) -> Optional[str]
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| 253 | """Returns None if not present."""
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| 254 | return _ONE_CHAR_PROMPT.get(c)
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| 255 |
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| 256 |
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| 257 | #
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| 258 | # Constants used by osh/split.py
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| 259 | #
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| 260 |
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| 261 | # IFS splitting is complicated in general. We handle it with three concepts:
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| 262 | #
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| 263 | # - CH.* - Kinds of characters (edge labels)
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| 264 | # - ST.* - States (node labels)
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| 265 | # - EMIT.* Actions
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| 266 | #
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| 267 | # The Split() loop below classifies characters, follows state transitions, and
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| 268 | # emits spans. A span is a (ignored Bool, end_index Int) pair.
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| 269 |
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| 270 | # As an example, consider this string:
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| 271 | # 'a _ b'
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| 272 | #
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| 273 | # The character classes are:
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| 274 | #
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| 275 | # a ' ' _ ' ' b
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| 276 | # Black DE_White DE_Gray DE_White Black
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| 277 | #
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| 278 | # The states are:
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| 279 | #
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| 280 | # a ' ' _ ' ' b
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| 281 | # Black DE_White1 DE_Gray DE_White2 Black
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| 282 | #
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| 283 | # DE_White2 is whitespace that follows a "gray" non-whitespace IFS character.
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| 284 | #
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| 285 | # The spans emitted are:
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| 286 | #
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| 287 | # (part 'a', ignored ' _ ', part 'b')
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| 288 |
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| 289 | # SplitForRead() will check if the last two spans are a \ and \\n. Easy.
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| 290 |
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| 291 | # Shorter names for state machine enums
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| 292 | from _devbuild.gen.runtime_asdl import state_t, emit_t, char_kind_t
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| 293 | from _devbuild.gen.runtime_asdl import emit_i as EMIT
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| 294 | from _devbuild.gen.runtime_asdl import char_kind_i as CH
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| 295 | from _devbuild.gen.runtime_asdl import state_i as ST
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| 296 |
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| 297 | _IFS_EDGES = {
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| 298 | # Whitespace should have been stripped
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| 299 | (ST.Start, CH.DE_White): (ST.Invalid, EMIT.Nothing), # ' '
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| 300 | (ST.Start, CH.DE_Gray): (ST.DE_Gray, EMIT.Empty), # '_'
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| 301 | (ST.Start, CH.Black): (ST.Black, EMIT.Nothing), # 'a'
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| 302 | (ST.Start, CH.Backslash): (ST.Backslash, EMIT.Nothing), # '\'
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| 303 | (ST.Start, CH.Sentinel): (ST.Done, EMIT.Nothing), # ''
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| 304 | (ST.DE_White1, CH.DE_White): (ST.DE_White1, EMIT.Nothing), # ' '
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| 305 | (ST.DE_White1, CH.DE_Gray): (ST.DE_Gray, EMIT.Nothing), # ' _'
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| 306 | (ST.DE_White1, CH.Black): (ST.Black, EMIT.Delim), # ' a'
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| 307 | (ST.DE_White1, CH.Backslash): (ST.Backslash, EMIT.Delim), # ' \'
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| 308 | # Ignore trailing IFS whitespace too. This is necessary for the case:
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| 309 | # IFS=':' ; read x y z <<< 'a : b : c :'.
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| 310 | (ST.DE_White1, CH.Sentinel): (ST.Done, EMIT.Nothing), # 'zz '
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| 311 | (ST.DE_Gray, CH.DE_White): (ST.DE_White2, EMIT.Nothing), # '_ '
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| 312 | (ST.DE_Gray, CH.DE_Gray): (ST.DE_Gray, EMIT.Empty), # '__'
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| 313 | (ST.DE_Gray, CH.Black): (ST.Black, EMIT.Delim), # '_a'
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| 314 | (ST.DE_Gray, CH.Backslash): (ST.Black, EMIT.Delim), # '_\'
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| 315 | (ST.DE_Gray, CH.Sentinel): (ST.Done, EMIT.Delim), # 'zz:' IFS=': '
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| 316 | (ST.DE_White2, CH.DE_White): (ST.DE_White2, EMIT.Nothing), # '_ '
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| 317 | (ST.DE_White2, CH.DE_Gray): (ST.DE_Gray, EMIT.Empty), # '_ _'
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| 318 | (ST.DE_White2, CH.Black): (ST.Black, EMIT.Delim), # '_ a'
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| 319 | (ST.DE_White2, CH.Backslash): (ST.Backslash, EMIT.Delim), # '_ \'
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| 320 | (ST.DE_White2, CH.Sentinel): (ST.Done, EMIT.Delim), # 'zz: ' IFS=': '
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| 321 | (ST.Black, CH.DE_White): (ST.DE_White1, EMIT.Part), # 'a '
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| 322 | (ST.Black, CH.DE_Gray): (ST.DE_Gray, EMIT.Part), # 'a_'
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| 323 | (ST.Black, CH.Black): (ST.Black, EMIT.Nothing), # 'aa'
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| 324 | (ST.Black, CH.Backslash): (ST.Backslash, EMIT.Part), # 'a\'
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| 325 | (ST.Black, CH.Sentinel): (ST.Done, EMIT.Part), # 'zz' IFS=': '
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| 326 |
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| 327 | # Here we emit an ignored \ and the second character as well.
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| 328 | # We're emitting TWO spans here; we don't wait until the subsequent
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| 329 | # character. That is OK.
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| 330 | #
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| 331 | # Problem: if '\ ' is the last one, we don't want to emit a trailing span?
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| 332 | # In all other cases we do.
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| 333 | (ST.Backslash, CH.DE_White): (ST.Black, EMIT.Escape), # '\ '
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| 334 | (ST.Backslash, CH.DE_Gray): (ST.Black, EMIT.Escape), # '\_'
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| 335 | (ST.Backslash, CH.Black): (ST.Black, EMIT.Escape), # '\a'
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| 336 | # NOTE: second character is a backslash, but new state is ST.Black!
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| 337 | (ST.Backslash, CH.Backslash): (ST.Black, EMIT.Escape), # '\\'
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| 338 | (ST.Backslash, CH.Sentinel): (ST.Done, EMIT.Escape), # 'zz\'
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| 339 | }
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| 340 |
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| 341 |
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| 342 | def IfsEdge(state, ch):
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| 343 | # type: (state_t, char_kind_t) -> Tuple[state_t, emit_t]
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| 344 | """Follow edges of the IFS state machine."""
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| 345 | return _IFS_EDGES[state, ch]
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| 346 |
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| 347 |
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| 348 | # Pattern to use libc regexec() to parse NAME, NAME=value, and NAME+=value.
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| 349 | #
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| 350 | # We want submatch extraction, which would need a new type of binding, and
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| 351 | # doing it with libc seems easy enough.
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| 352 |
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| 353 | ASSIGN_ARG_RE = '^(' + lexer_def.VAR_NAME_RE + ')((=|\+=)(.*))?$'
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| 354 |
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| 355 | # Eggex equivalent:
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| 356 | #
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| 357 | # VarName = /
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| 358 | # [a-z A-Z _ ]
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| 359 | # [a-z A-Z 0-9 _ ]*
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| 360 | # /
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| 361 | #
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| 362 | # SplitArg = /
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| 363 | # %begin
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| 364 | # < capture VarName >
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| 365 | # < capture
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| 366 | # < capture '=' | '+=' > < capture dot* >
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| 367 | # > ?
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| 368 | # %end
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| 369 | #
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| 370 | # Note: we use < > for grouping because ERE has no non-capturing group.
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