| 1 | #!/usr/bin/env python2
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| 2 | """
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| 3 | func_reflect.py - Functions for reflecting on Oils code - OSH or YSH.
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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.runtime_asdl import (scope_e)
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| 8 | from _devbuild.gen.syntax_asdl import source
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| 9 | from _devbuild.gen.value_asdl import (value, value_e, value_t, cmd_frag)
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| 10 |
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| 11 | from core import alloc
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| 12 | from core import error
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| 13 | from core import main_loop
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| 14 | from core import state
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| 15 | from core import vm
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| 16 | from data_lang import j8
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| 17 | from frontend import location
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| 18 | from frontend import reader
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| 19 | from frontend import typed_args
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| 20 | from mycpp import mops
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| 21 | from mycpp.mylib import log, tagswitch
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| 22 | from ysh import expr_eval
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| 23 |
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| 24 | from typing import TYPE_CHECKING
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| 25 | if TYPE_CHECKING:
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| 26 | from frontend import parse_lib
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| 27 | from display import ui
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| 28 |
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| 29 | _ = log
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| 30 |
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| 31 |
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| 32 | class Id(vm._Callable):
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| 33 | """Return an integer object ID, like Python's id().
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| 34 |
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| 35 | Long shot: pointer tagging, boxless value_t, and small string optimization
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| 36 | could mean that value.Str is no longer heap-allocated, and thus doesn't
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| 37 | have a GC ID?
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| 38 |
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| 39 | What about value.{Bool,Int,Float}?
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| 40 |
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| 41 | I guess only mutable objects can have IDs then
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| 42 | """
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| 43 |
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| 44 | def __init__(self):
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| 45 | # type: () -> None
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| 46 | vm._Callable.__init__(self)
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| 47 |
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| 48 | def Call(self, rd):
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| 49 | # type: (typed_args.Reader) -> value_t
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| 50 | unused_vm = rd.PosValue() # vm.id()
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| 51 | val = rd.PosValue()
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| 52 | rd.Done()
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| 53 |
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| 54 | # Select mutable values for now
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| 55 | with tagswitch(val) as case:
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| 56 | if case(value_e.List, value_e.Dict, value_e.Obj):
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| 57 | id_ = j8.HeapValueId(val)
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| 58 | return value.Int(mops.IntWiden(id_))
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| 59 | else:
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| 60 | raise error.TypeErr(val, 'id() expected List, Dict, or Obj',
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| 61 | rd.BlamePos())
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| 62 | raise AssertionError()
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| 63 |
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| 64 |
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| 65 | class GetFrame(vm._Callable):
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| 66 |
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| 67 | def __init__(self, mem):
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| 68 | # type: (state.Mem) -> None
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| 69 | vm._Callable.__init__(self)
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| 70 | self.mem = mem
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| 71 |
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| 72 | def Call(self, rd):
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| 73 | # type: (typed_args.Reader) -> value_t
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| 74 | unused_self = rd.PosObj()
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| 75 | index = mops.BigTruncate(rd.PosInt())
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| 76 | rd.Done()
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| 77 |
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| 78 | length = len(self.mem.var_stack)
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| 79 | if index < 0:
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| 80 | index += length
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| 81 | if 0 <= index and index < length:
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| 82 | return value.Frame(self.mem.var_stack[index])
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| 83 | else:
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| 84 | raise error.Structured(3, "Invalid frame %d" % index,
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| 85 | rd.LeftParenToken())
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| 86 |
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| 87 |
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| 88 | class BindFrame(vm._Callable):
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| 89 |
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| 90 | def __init__(self):
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| 91 | # type: () -> None
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| 92 | vm._Callable.__init__(self)
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| 93 |
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| 94 | def Call(self, rd):
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| 95 | # type: (typed_args.Reader) -> value_t
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| 96 |
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| 97 | # TODO: also take an ExprFrag -> Expr
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| 98 |
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| 99 | frag = rd.PosCommandFrag()
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| 100 | frame = rd.PosFrame()
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| 101 | rd.Done()
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| 102 | return value.Null
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| 103 | # TODO: I guess you have to bind 2 frames?
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| 104 | #return Command(cmd_frag.Expr(frag), frame, None)
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| 105 |
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| 106 |
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| 107 | class Shvar_get(vm._Callable):
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| 108 | """Look up with dynamic scope."""
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| 109 |
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| 110 | def __init__(self, mem):
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| 111 | # type: (state.Mem) -> None
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| 112 | vm._Callable.__init__(self)
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| 113 | self.mem = mem
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| 114 |
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| 115 | def Call(self, rd):
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| 116 | # type: (typed_args.Reader) -> value_t
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| 117 | name = rd.PosStr()
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| 118 | rd.Done()
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| 119 | return state.DynamicGetVar(self.mem, name, scope_e.Dynamic)
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| 120 |
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| 121 |
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| 122 | class GetVar(vm._Callable):
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| 123 | """Look up a variable, with normal scoping rules."""
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| 124 |
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| 125 | def __init__(self, mem):
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| 126 | # type: (state.Mem) -> None
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| 127 | vm._Callable.__init__(self)
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| 128 | self.mem = mem
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| 129 |
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| 130 | def Call(self, rd):
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| 131 | # type: (typed_args.Reader) -> value_t
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| 132 | name = rd.PosStr()
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| 133 | rd.Done()
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| 134 | return state.DynamicGetVar(self.mem, name, scope_e.LocalOrGlobal)
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| 135 |
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| 136 |
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| 137 | class SetVar(vm._Callable):
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| 138 | """Set a variable in the local scope.
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| 139 |
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| 140 | We could have a separae setGlobal() too.
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| 141 | """
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| 142 |
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| 143 | def __init__(self, mem):
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| 144 | # type: (state.Mem) -> None
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| 145 | vm._Callable.__init__(self)
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| 146 | self.mem = mem
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| 147 |
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| 148 | def Call(self, rd):
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| 149 | # type: (typed_args.Reader) -> value_t
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| 150 | var_name = rd.PosStr()
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| 151 | val = rd.PosValue()
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| 152 | rd.Done()
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| 153 | self.mem.SetNamed(location.LName(var_name), val, scope_e.LocalOnly)
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| 154 | return value.Null
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| 155 |
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| 156 |
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| 157 | class ParseCommand(vm._Callable):
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| 158 |
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| 159 | def __init__(self, parse_ctx, mem, errfmt):
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| 160 | # type: (parse_lib.ParseContext, state.Mem, ui.ErrorFormatter) -> None
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| 161 | self.parse_ctx = parse_ctx
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| 162 | self.mem = mem
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| 163 | self.errfmt = errfmt
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| 164 |
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| 165 | def Call(self, rd):
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| 166 | # type: (typed_args.Reader) -> value_t
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| 167 | code_str = rd.PosStr()
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| 168 | rd.Done()
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| 169 |
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| 170 | line_reader = reader.StringLineReader(code_str, self.parse_ctx.arena)
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| 171 | c_parser = self.parse_ctx.MakeOshParser(line_reader)
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| 172 |
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| 173 | # TODO: it would be nice to point to the location of the expression
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| 174 | # argument
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| 175 | src = source.Dynamic('parseCommand()', rd.LeftParenToken())
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| 176 | with alloc.ctx_SourceCode(self.parse_ctx.arena, src):
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| 177 | try:
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| 178 | cmd = main_loop.ParseWholeFile(c_parser)
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| 179 | except error.Parse as e:
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| 180 | # This prints the location
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| 181 | self.errfmt.PrettyPrintError(e)
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| 182 |
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| 183 | # TODO: add inner location info to this structured error
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| 184 | raise error.Structured(3, "Syntax error in parseCommand()",
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| 185 | rd.LeftParenToken())
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| 186 |
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| 187 | # TODO: It's a little weird that this captures?
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| 188 | # We should have scoping like 'eval $mystr'
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| 189 | # Or we should have
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| 190 | #
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| 191 | # var c = parseCommand('echo hi') # raw AST
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| 192 | # var block = Block(c) # attachs the current frame
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| 193 | #
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| 194 | # Yeah we might need this for value.Expr too, to control evaluation of
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| 195 | # names
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| 196 | #
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| 197 | # value.Expr vs. value.BoundExpr - it's bound to the frame it's defined
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| 198 | # in
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| 199 | # value.Command vs. value.Block - BoundCommand?
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| 200 |
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| 201 | return value.Command(cmd_frag.Expr(cmd), self.mem.CurrentFrame(),
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| 202 | self.mem.GlobalFrame())
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| 203 |
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| 204 |
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| 205 | class ParseExpr(vm._Callable):
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| 206 |
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| 207 | def __init__(self, parse_ctx, errfmt):
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| 208 | # type: (parse_lib.ParseContext, ui.ErrorFormatter) -> None
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| 209 | self.parse_ctx = parse_ctx
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| 210 | self.errfmt = errfmt
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| 211 |
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| 212 | def Call(self, rd):
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| 213 | # type: (typed_args.Reader) -> value_t
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| 214 | code_str = rd.PosStr()
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| 215 | rd.Done()
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| 216 |
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| 217 | return value.Null
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| 218 |
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| 219 |
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| 220 | class EvalExpr(vm._Callable):
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| 221 |
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| 222 | def __init__(self, expr_ev):
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| 223 | # type: (expr_eval.ExprEvaluator) -> None
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| 224 | self.expr_ev = expr_ev
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| 225 |
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| 226 | def Call(self, rd):
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| 227 | # type: (typed_args.Reader) -> value_t
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| 228 | unused_self = rd.PosObj()
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| 229 | lazy = rd.PosExpr()
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| 230 | rd.Done()
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| 231 |
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| 232 | result = self.expr_ev.EvalExprClosure(lazy, rd.LeftParenToken())
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| 233 |
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| 234 | return result
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