| 1 | # Data types used at runtime
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| 2 |
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| 3 | module runtime
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| 4 | {
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| 5 | # import from frontend/syntax.asdl
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| 6 | use frontend syntax {
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| 7 | loc Token
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| 8 | expr word command
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| 9 | CompoundWord DoubleQuoted
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| 10 | ArgList re redir_loc proc_sig
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| 11 | Func
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| 12 | }
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| 13 |
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| 14 | use core value {
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| 15 | value Obj
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| 16 | }
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| 17 |
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| 18 | # Evaluating SimpleCommand results in either an argv array or an assignment.
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| 19 | # in 'local foo', rval is None.
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| 20 | AssignArg = (str var_name, value? rval, bool plus_eq, CompoundWord blame_word)
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| 21 |
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| 22 | ProcArgs = (
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| 23 | # Unevaluated args
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| 24 | ArgList typed_args,
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| 25 |
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| 26 | # Evaluated args, similar to typed_args.py Reader
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| 27 | List[value]? pos_args, Dict[str, value]? named_args,
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| 28 |
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| 29 | # block_arg comes from either p (; ; myblock) or p { echo b }
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| 30 | value? block_arg
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| 31 | )
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| 32 |
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| 33 | # note: could import 'builtin' from synthetic option_asdl
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| 34 | cmd_value =
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| 35 | Argv(List[str] argv, List[CompoundWord] arg_locs,
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| 36 | bool is_last_cmd,
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| 37 | Obj? self_obj, ProcArgs? proc_args)
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| 38 |
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| 39 | | Assign(int builtin_id,
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| 40 | List[str] argv, List[CompoundWord] arg_locs,
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| 41 | List[AssignArg] pairs)
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| 42 |
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| 43 | # A Piece is a part of a word that's been evaluated
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| 44 | # Bare word | echo *.py | quoted=False do_split=False
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| 45 | # Unquoted subst | $x ${x} | quoted=False do_split=True
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| 46 | # Quoted string | 'sq' "$x" | quoted=True do_split=False
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| 47 | # The 'quoted' flag is used to determine whether globbing will occur, as well
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| 48 | # as empty elision like x=''; $x$x versus "$x"$x
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| 49 | Piece = (str s, bool quoted, bool do_split)
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| 50 |
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| 51 | # A parse-time word_part from syntax.asdl is evaluated to a runtime
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| 52 | # part_value.
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| 53 | part_value =
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| 54 | String %Piece
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| 55 |
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| 56 | # "$@" or "${a[@]}" # never globbed or split (though other shells
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| 57 | # split them)
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| 58 | | Array(List[str] strs, bool quoted)
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| 59 | # only produced when EXTGLOB_FS flag is passed
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| 60 | | ExtGlob(List[part_value] part_vals)
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| 61 |
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| 62 | coerced = Int | Float | Neither
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| 63 |
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| 64 | # evaluation state for BracedVarSub. See "doc/ref/chap-word-lang.md" for
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| 65 | # the description of h-value of a variable substitution.
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| 66 | VarSubState = (bool join_array, value h_value, Token array_ref)
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| 67 |
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| 68 | # A Cell is a wrapper for a value.
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| 69 | # TODO: add location for declaration for 'assigning const' error
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| 70 |
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| 71 | # Invariant: if exported or nameref is set, the val should be Str or Undef.
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| 72 | # This is enforced in mem.SetValue but isn't expressed in the schema.
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| 73 | Cell = (bool exported, bool readonly, bool nameref, value val)
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| 74 |
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| 75 | # Where scopes are used
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| 76 | # Shopt: to respect shopt -u dynamic_scope.
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| 77 | # GetValue: Dynamic or LocalOrGlobal
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| 78 | # SetValue: Dynamic or LocalOnly
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| 79 | # Dynamic:
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| 80 | # GetValue: Shell Style
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| 81 | # SetValue: Shell Style
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| 82 | # LocalOrGlobal:
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| 83 | # GetValue: YSH style
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| 84 | # SetValue: N/A
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| 85 | # LocalOnly:
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| 86 | # GetValue: N/A, we can always READ globals
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| 87 | # SetValue: setvar, parameter bindings, for loop iterator vars
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| 88 | # GlobalOnly:
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| 89 | # GetValue: N/A
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| 90 | # SetValue: internal use in COMPREPLY, and YSH 'setglobal' keyword
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| 91 |
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| 92 | # TODO: Avoid mutating __builtins__? This could be illegal:
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| 93 | #
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| 94 | # setvar io.glob = 'foo'
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| 95 | #
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| 96 | # Instead of LocalOnly, GlobalOnly, have MutateLocalOnly, MutateGlobalOnly?
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| 97 | # So they don't find the 'io' or 'vm' builtin Objs
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| 98 |
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| 99 | scope = Shopt | Dynamic | LocalOrGlobal | LocalOnly | GlobalOnly
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| 100 |
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| 101 | # What is valid in arrays or assoc arrays a[i] or A[i] in shell.
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| 102 | # Used for ${a[i]=x}.
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| 103 | a_index = Str(str s) | Int(int i)
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| 104 |
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| 105 | # For the place in ${a[0]=a}
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| 106 | # Transformed into sh_lvalue_t
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| 107 | VTestPlace = (str? name, a_index? index)
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| 108 |
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| 109 | redirect_arg =
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| 110 | Path(str filename)
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| 111 | | CopyFd(int target_fd)
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| 112 | | MoveFd(int target_fd) # 3>&1-
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| 113 | | CloseFd
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| 114 | | HereDoc(str body) # call this String and combine with Path?
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| 115 |
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| 116 | # Evaluated version of syntax.Redir
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| 117 | RedirValue = (id op_id, loc op_loc, redir_loc loc, redirect_arg arg)
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| 118 |
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| 119 | # An exit status with location info. For process sub.
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| 120 | StatusArray = (
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| 121 | List[int]? codes, # init to null, rarely allocated
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| 122 | List[loc]? locs # init to null, rarely allocated
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| 123 | )
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| 124 |
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| 125 | CommandStatus = (
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| 126 | # set for atoms
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| 127 | bool check_errexit,
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| 128 |
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| 129 | # By default, don't show the code on errexit. Sometimes we want to.
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| 130 | bool show_code
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| 131 |
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| 132 | # Should we use 'int simple_status' for atoms like atoms like ls (( [[ ?
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| 133 |
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| 134 | # for pipeline
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| 135 | bool pipe_negated,
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| 136 | List[int]? pipe_status, # init to null, rarely allocated
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| 137 | List[loc]? pipe_locs, # init to null, rarely allocated
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| 138 | )
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| 139 |
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| 140 | # core/process.py
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| 141 | # A Job is a Process or Pipeline.
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| 142 | # - Processes usually go from Running to Stopped, unless unless Ctrl-Z stops
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| 143 | # them.
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| 144 | # - Pipelines go Running to Done. They are never stopped; only the processes
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| 145 | # inside them are stopped.
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| 146 | job_state = Running | Exited | Stopped
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| 147 |
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| 148 | # event is W1_EXITED or W1_STOPPED
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| 149 | wait_status =
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| 150 | Proc(job_state state, int code)
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| 151 | | Pipeline(job_state state, List[int] codes)
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| 152 | # because the 'wait' builtin is interruptible
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| 153 | | Cancelled(int sig_num)
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| 154 |
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| 155 | flow = Nothing | Break | Raise
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| 156 |
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| 157 | # For word splitting (in frontend/consts.py and osh/split.py)
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| 158 | span = Black | Delim | Backslash
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| 159 |
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| 160 | emit = Part | Delim | Empty | Escape | Nothing
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| 161 | generate [integers]
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| 162 | state = Invalid | Start | DE_White1 | DE_Gray | DE_White2 | Black | Backslash | Done
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| 163 | generate [integers]
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| 164 |
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| 165 | # Edges are characters. DE_ is the delimiter prefix. DE_White is for
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| 166 | # whitespace; DE_Gray is for other IFS chars; Black is for significant
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| 167 | # characters. Sentinel is the end of the string.
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| 168 | char_kind = DE_White | DE_Gray | Black | Backslash | Sentinel
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| 169 | generate [integers]
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| 170 |
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| 171 | # core/bash_impl.py
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| 172 | error_code = OK | IndexOutOfRange
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| 173 |
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| 174 | # Flag arguments can be any of these types.
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| 175 | flag_type = Bool | Int | Float | Str
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| 176 |
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| 177 | # For dev.Tracer
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| 178 | trace =
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| 179 | External(List[str] argv) # sync, needs argv (command.Simple or 'command')
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| 180 | | CommandSub # sync
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| 181 | | ForkWait # sync
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| 182 | | Fork # async, needs argv, & fork
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| 183 | | PipelinePart # async
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| 184 | | ProcessSub # async (other processes can be started)
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| 185 | | HereDoc # async (multiple here docs per process)
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| 186 |
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| 187 | # tools/ysh_ify.py
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| 188 | word_style = Expr | Unquoted | DQ | SQ
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| 189 |
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| 190 | # Hay "first word" namespace
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| 191 | HayNode = (Dict[str, HayNode] children)
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| 192 |
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| 193 | comp_action = Other | FileSystem | BashFunc
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| 194 | }
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| 195 |
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| 196 | # vim: sw=2
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