| 1 | #!/usr/bin/env python2
|
| 2 | """expr_eval.py."""
|
| 3 | from __future__ import print_function
|
| 4 |
|
| 5 | from _devbuild.gen.id_kind_asdl import Id
|
| 6 | from _devbuild.gen.syntax_asdl import (
|
| 7 | loc,
|
| 8 | loc_t,
|
| 9 | re,
|
| 10 | re_e,
|
| 11 | re_t,
|
| 12 | Token,
|
| 13 | SimpleVarSub,
|
| 14 | word_part,
|
| 15 | SingleQuoted,
|
| 16 | DoubleQuoted,
|
| 17 | BracedVarSub,
|
| 18 | ShArrayLiteral,
|
| 19 | CommandSub,
|
| 20 | expr,
|
| 21 | expr_e,
|
| 22 | expr_t,
|
| 23 | y_lhs_e,
|
| 24 | y_lhs_t,
|
| 25 | Attribute,
|
| 26 | Subscript,
|
| 27 | class_literal_term,
|
| 28 | class_literal_term_e,
|
| 29 | class_literal_term_t,
|
| 30 | char_class_term_t,
|
| 31 | PosixClass,
|
| 32 | PerlClass,
|
| 33 | CharCode,
|
| 34 | CharRange,
|
| 35 | ArgList,
|
| 36 | Eggex,
|
| 37 | )
|
| 38 | from _devbuild.gen.runtime_asdl import (
|
| 39 | coerced_e,
|
| 40 | coerced_t,
|
| 41 | scope_e,
|
| 42 | scope_t,
|
| 43 | part_value,
|
| 44 | part_value_t,
|
| 45 | Piece,
|
| 46 | )
|
| 47 | from _devbuild.gen.value_asdl import (value, value_e, value_t, y_lvalue,
|
| 48 | y_lvalue_e, y_lvalue_t, IntBox, LeftName,
|
| 49 | Obj)
|
| 50 | from core import error
|
| 51 | from core.error import e_die, e_die_status
|
| 52 | from core import num
|
| 53 | from core import pyutil
|
| 54 | from core import state
|
| 55 | from display import ui
|
| 56 | from core import vm
|
| 57 | from data_lang import j8
|
| 58 | from frontend import lexer
|
| 59 | from frontend import match
|
| 60 | from frontend import typed_args
|
| 61 | from osh import braces
|
| 62 | from mycpp import mops
|
| 63 | from mycpp.mylib import log, NewDict, switch, tagswitch, print_stderr
|
| 64 | from ysh import func_proc
|
| 65 | from ysh import val_ops
|
| 66 |
|
| 67 | import libc
|
| 68 |
|
| 69 | from typing import cast, Optional, Dict, List, Tuple, TYPE_CHECKING
|
| 70 |
|
| 71 | if TYPE_CHECKING:
|
| 72 | from osh import cmd_eval
|
| 73 | from osh import word_eval
|
| 74 | from osh import split
|
| 75 |
|
| 76 | _ = log
|
| 77 |
|
| 78 |
|
| 79 | def LookupVar(mem, var_name, which_scopes, var_loc):
|
| 80 | # type: (state.Mem, str, scope_t, loc_t) -> value_t
|
| 81 |
|
| 82 | # Lookup WITHOUT dynamic scope.
|
| 83 | val = mem.GetValue(var_name, which_scopes=which_scopes)
|
| 84 | if val.tag() == value_e.Undef:
|
| 85 | e_die('Undefined variable %r' % var_name, var_loc)
|
| 86 |
|
| 87 | return val
|
| 88 |
|
| 89 |
|
| 90 | def _ConvertToInt(val, msg, blame_loc):
|
| 91 | # type: (value_t, str, loc_t) -> mops.BigInt
|
| 92 | UP_val = val
|
| 93 | with tagswitch(val) as case:
|
| 94 | if case(value_e.Int):
|
| 95 | val = cast(value.Int, UP_val)
|
| 96 | return val.i
|
| 97 |
|
| 98 | elif case(value_e.Str):
|
| 99 | val = cast(value.Str, UP_val)
|
| 100 | if match.LooksLikeInteger(val.s):
|
| 101 | # TODO: Handle ValueError
|
| 102 | return mops.FromStr(val.s)
|
| 103 |
|
| 104 | raise error.TypeErr(val, msg, blame_loc)
|
| 105 |
|
| 106 |
|
| 107 | def _ConvertToNumber(val):
|
| 108 | # type: (value_t) -> Tuple[coerced_t, mops.BigInt, float]
|
| 109 | UP_val = val
|
| 110 | with tagswitch(val) as case:
|
| 111 | if case(value_e.Int):
|
| 112 | val = cast(value.Int, UP_val)
|
| 113 | return coerced_e.Int, val.i, -1.0
|
| 114 |
|
| 115 | elif case(value_e.Float):
|
| 116 | val = cast(value.Float, UP_val)
|
| 117 | return coerced_e.Float, mops.MINUS_ONE, val.f
|
| 118 |
|
| 119 | elif case(value_e.Str):
|
| 120 | val = cast(value.Str, UP_val)
|
| 121 | if match.LooksLikeInteger(val.s):
|
| 122 | # TODO: Handle ValueError
|
| 123 | return coerced_e.Int, mops.FromStr(val.s), -1.0
|
| 124 |
|
| 125 | if match.LooksLikeFloat(val.s):
|
| 126 | return coerced_e.Float, mops.MINUS_ONE, float(val.s)
|
| 127 |
|
| 128 | return coerced_e.Neither, mops.MINUS_ONE, -1.0
|
| 129 |
|
| 130 |
|
| 131 | def _ConvertForBinaryOp(left, right):
|
| 132 | # type: (value_t, value_t) -> Tuple[coerced_t, mops.BigInt, mops.BigInt, float, float]
|
| 133 | """
|
| 134 | Returns one of
|
| 135 | value_e.Int or value_e.Float
|
| 136 | 2 ints or 2 floats
|
| 137 |
|
| 138 | To indicate which values the operation should be done on
|
| 139 | """
|
| 140 | c1, i1, f1 = _ConvertToNumber(left)
|
| 141 | c2, i2, f2 = _ConvertToNumber(right)
|
| 142 |
|
| 143 | nope = mops.MINUS_ONE
|
| 144 |
|
| 145 | if c1 == coerced_e.Int and c2 == coerced_e.Int:
|
| 146 | return coerced_e.Int, i1, i2, -1.0, -1.0
|
| 147 |
|
| 148 | elif c1 == coerced_e.Int and c2 == coerced_e.Float:
|
| 149 | return coerced_e.Float, nope, nope, mops.ToFloat(i1), f2
|
| 150 |
|
| 151 | elif c1 == coerced_e.Float and c2 == coerced_e.Int:
|
| 152 | return coerced_e.Float, nope, nope, f1, mops.ToFloat(i2)
|
| 153 |
|
| 154 | elif c1 == coerced_e.Float and c2 == coerced_e.Float:
|
| 155 | return coerced_e.Float, nope, nope, f1, f2
|
| 156 |
|
| 157 | else:
|
| 158 | # No operation is valid
|
| 159 | return coerced_e.Neither, nope, nope, -1.0, -1.0
|
| 160 |
|
| 161 |
|
| 162 | class ExprEvaluator(object):
|
| 163 | """Shared between arith and bool evaluators.
|
| 164 |
|
| 165 | They both:
|
| 166 |
|
| 167 | 1. Convert strings to integers, respecting shopt -s strict_arith.
|
| 168 | 2. Look up variables and evaluate words.
|
| 169 | """
|
| 170 |
|
| 171 | def __init__(
|
| 172 | self,
|
| 173 | mem, # type: state.Mem
|
| 174 | mutable_opts, # type: state.MutableOpts
|
| 175 | methods, # type: Dict[int, Dict[str, vm._Callable]]
|
| 176 | splitter, # type: split.SplitContext
|
| 177 | errfmt, # type: ui.ErrorFormatter
|
| 178 | ):
|
| 179 | # type: (...) -> None
|
| 180 | self.shell_ex = None # type: vm._Executor
|
| 181 | self.cmd_ev = None # type: cmd_eval.CommandEvaluator
|
| 182 | self.word_ev = None # type: word_eval.AbstractWordEvaluator
|
| 183 |
|
| 184 | self.mem = mem
|
| 185 | self.mutable_opts = mutable_opts
|
| 186 | self.methods = methods
|
| 187 | self.splitter = splitter
|
| 188 | self.errfmt = errfmt
|
| 189 |
|
| 190 | def CheckCircularDeps(self):
|
| 191 | # type: () -> None
|
| 192 | assert self.shell_ex is not None
|
| 193 | assert self.word_ev is not None
|
| 194 |
|
| 195 | def _LookupVar(self, name, var_loc):
|
| 196 | # type: (str, loc_t) -> value_t
|
| 197 | return LookupVar(self.mem, name, scope_e.LocalOrGlobal, var_loc)
|
| 198 |
|
| 199 | def EvalAugmented(self, lval, rhs_val, op, which_scopes):
|
| 200 | # type: (y_lvalue_t, value_t, Token, scope_t) -> None
|
| 201 | """ setvar x +=1, setvar L[0] -= 1
|
| 202 |
|
| 203 | Called by CommandEvaluator
|
| 204 | """
|
| 205 | # TODO: It might be nice to do auto d[x] += 1 too
|
| 206 |
|
| 207 | UP_lval = lval
|
| 208 | with tagswitch(lval) as case:
|
| 209 | if case(y_lvalue_e.Local): # setvar x += 1
|
| 210 | lval = cast(LeftName, UP_lval)
|
| 211 | lhs_val = self._LookupVar(lval.name, lval.blame_loc)
|
| 212 | if op.id in (Id.Arith_PlusEqual, Id.Arith_MinusEqual,
|
| 213 | Id.Arith_StarEqual, Id.Arith_SlashEqual):
|
| 214 | new_val = self._ArithIntFloat(lhs_val, rhs_val, op)
|
| 215 | else:
|
| 216 | new_val = self._ArithIntOnly(lhs_val, rhs_val, op)
|
| 217 |
|
| 218 | self.mem.SetNamed(lval, new_val, which_scopes)
|
| 219 |
|
| 220 | elif case(y_lvalue_e.Container): # setvar d.key += 1
|
| 221 | lval = cast(y_lvalue.Container, UP_lval)
|
| 222 |
|
| 223 | obj = lval.obj
|
| 224 | UP_obj = obj
|
| 225 |
|
| 226 | lhs_val_ = None # type: value_t
|
| 227 | # Similar to command_e.Mutation
|
| 228 | with tagswitch(obj) as case:
|
| 229 | if case(value_e.List):
|
| 230 | obj = cast(value.List, UP_obj)
|
| 231 | index = val_ops.ToInt(lval.index,
|
| 232 | 'List index should be Int',
|
| 233 | loc.Missing)
|
| 234 | try:
|
| 235 | lhs_val_ = obj.items[index]
|
| 236 | except IndexError:
|
| 237 | raise error.Expr(
|
| 238 | 'List index out of range: %d' % index,
|
| 239 | loc.Missing)
|
| 240 |
|
| 241 | elif case(value_e.Dict):
|
| 242 | obj = cast(value.Dict, UP_obj)
|
| 243 | index = -1 # silence C++ warning
|
| 244 | key = val_ops.ToStr(lval.index,
|
| 245 | 'Dict index should be Str',
|
| 246 | loc.Missing)
|
| 247 | try:
|
| 248 | lhs_val_ = obj.d[key]
|
| 249 | except KeyError:
|
| 250 | raise error.Expr('Dict entry not found: %r' % key,
|
| 251 | loc.Missing)
|
| 252 |
|
| 253 | else:
|
| 254 | raise error.TypeErr(
|
| 255 | obj, "obj[index] expected List or Dict",
|
| 256 | loc.Missing)
|
| 257 |
|
| 258 | if op.id in (Id.Arith_PlusEqual, Id.Arith_MinusEqual,
|
| 259 | Id.Arith_StarEqual, Id.Arith_SlashEqual):
|
| 260 | new_val_ = self._ArithIntFloat(lhs_val_, rhs_val, op)
|
| 261 | else:
|
| 262 | new_val_ = self._ArithIntOnly(lhs_val_, rhs_val, op)
|
| 263 |
|
| 264 | with tagswitch(obj) as case:
|
| 265 | if case(value_e.List):
|
| 266 | obj = cast(value.List, UP_obj)
|
| 267 | assert index != -1, 'Should have been initialized'
|
| 268 | obj.items[index] = new_val_
|
| 269 |
|
| 270 | elif case(value_e.Dict):
|
| 271 | obj = cast(value.Dict, UP_obj)
|
| 272 | obj.d[key] = new_val_
|
| 273 |
|
| 274 | else:
|
| 275 | raise AssertionError()
|
| 276 |
|
| 277 | def _EvalLeftLocalOrGlobal(self, lhs, which_scopes):
|
| 278 | # type: (expr_t, scope_t) -> value_t
|
| 279 | """Evaluate the LEFT MOST part, respecting setvar/setglobal.
|
| 280 |
|
| 281 | Consider this statement:
|
| 282 |
|
| 283 | setglobal g[a[i]] = 42
|
| 284 |
|
| 285 | - The g is always global, never local. It's the thing to be mutated.
|
| 286 | - The a can be local or global
|
| 287 | """
|
| 288 | UP_lhs = lhs
|
| 289 | with tagswitch(lhs) as case:
|
| 290 | if case(expr_e.Var):
|
| 291 | lhs = cast(expr.Var, UP_lhs)
|
| 292 |
|
| 293 | # respect setvar/setglobal with which_scopes
|
| 294 | return LookupVar(self.mem, lhs.name, which_scopes, lhs.left)
|
| 295 |
|
| 296 | elif case(expr_e.Subscript):
|
| 297 | lhs = cast(Subscript, UP_lhs)
|
| 298 |
|
| 299 | # recursive call
|
| 300 | obj = self._EvalLeftLocalOrGlobal(lhs.obj, which_scopes)
|
| 301 | index = self._EvalExpr(lhs.index)
|
| 302 |
|
| 303 | return self._EvalSubscript(obj, index)
|
| 304 |
|
| 305 | elif case(expr_e.Attribute):
|
| 306 | lhs = cast(Attribute, UP_lhs)
|
| 307 | assert lhs.op.id == Id.Expr_Dot
|
| 308 |
|
| 309 | # recursive call
|
| 310 | obj = self._EvalLeftLocalOrGlobal(lhs.obj, which_scopes)
|
| 311 | return self._EvalDot(lhs, obj)
|
| 312 |
|
| 313 | else:
|
| 314 | # Shouldn't happen because of Transformer._CheckLhs
|
| 315 | raise AssertionError()
|
| 316 |
|
| 317 | def _EvalLhsExpr(self, lhs, which_scopes):
|
| 318 | # type: (y_lhs_t, scope_t) -> y_lvalue_t
|
| 319 | """
|
| 320 | Handle setvar x, setvar a[i], ... setglobal x, setglobal a[i]
|
| 321 | """
|
| 322 | UP_lhs = lhs
|
| 323 | with tagswitch(lhs) as case:
|
| 324 | if case(y_lhs_e.Var):
|
| 325 | lhs = cast(Token, UP_lhs)
|
| 326 | return LeftName(lexer.LazyStr(lhs), lhs)
|
| 327 |
|
| 328 | elif case(y_lhs_e.Subscript):
|
| 329 | lhs = cast(Subscript, UP_lhs)
|
| 330 | # setvar mylist[0] = 42
|
| 331 | # setvar mydict['key'] = 42
|
| 332 |
|
| 333 | lval = self._EvalLeftLocalOrGlobal(lhs.obj, which_scopes)
|
| 334 | index = self._EvalExpr(lhs.index)
|
| 335 | return y_lvalue.Container(lval, index)
|
| 336 |
|
| 337 | elif case(y_lhs_e.Attribute):
|
| 338 | lhs = cast(Attribute, UP_lhs)
|
| 339 | assert lhs.op.id == Id.Expr_Dot
|
| 340 |
|
| 341 | # setvar mydict.key = 42
|
| 342 | lval = self._EvalLeftLocalOrGlobal(lhs.obj, which_scopes)
|
| 343 |
|
| 344 | attr = value.Str(lhs.attr_name)
|
| 345 | return y_lvalue.Container(lval, attr)
|
| 346 |
|
| 347 | else:
|
| 348 | raise AssertionError()
|
| 349 |
|
| 350 | def EvalExpr(self, node, blame_loc):
|
| 351 | # type: (expr_t, loc_t) -> value_t
|
| 352 | """Public API for _EvalExpr to ensure command_sub_errexit"""
|
| 353 | self.mem.SetLocationForExpr(blame_loc)
|
| 354 | # Pure C++ won't need to catch exceptions
|
| 355 | with state.ctx_YshExpr(self.mutable_opts):
|
| 356 | val = self._EvalExpr(node)
|
| 357 | return val
|
| 358 |
|
| 359 | def EvalLhsExpr(self, lhs, which_scopes):
|
| 360 | # type: (y_lhs_t, scope_t) -> y_lvalue_t
|
| 361 | """Public API for _EvalLhsExpr to ensure command_sub_errexit"""
|
| 362 | with state.ctx_YshExpr(self.mutable_opts):
|
| 363 | lval = self._EvalLhsExpr(lhs, which_scopes)
|
| 364 | return lval
|
| 365 |
|
| 366 | def EvalExprSub(self, part):
|
| 367 | # type: (word_part.ExprSub) -> part_value_t
|
| 368 |
|
| 369 | val = self.EvalExpr(part.child, part.left)
|
| 370 |
|
| 371 | with switch(part.left.id) as case:
|
| 372 | if case(Id.Left_DollarBracket): # $[join(x)]
|
| 373 | s = val_ops.Stringify(val, loc.WordPart(part))
|
| 374 | return Piece(s, False, False)
|
| 375 |
|
| 376 | elif case(Id.Lit_AtLBracket): # @[split(x)]
|
| 377 | strs = val_ops.ToShellArray(val,
|
| 378 | loc.WordPart(part),
|
| 379 | prefix='Expr splice ')
|
| 380 | return part_value.Array(strs)
|
| 381 |
|
| 382 | else:
|
| 383 | raise AssertionError(part.left)
|
| 384 |
|
| 385 | def PluginCall(self, func_val, pos_args):
|
| 386 | # type: (value.Func, List[value_t]) -> value_t
|
| 387 | """For renderPrompt()
|
| 388 |
|
| 389 | Similar to
|
| 390 | - WordEvaluator.EvalForPlugin(), which evaluates $PS1 outside main loop
|
| 391 | - ReadlineCallback.__call__, which executes shell outside main loop
|
| 392 | """
|
| 393 | with state.ctx_YshExpr(self.mutable_opts):
|
| 394 | with state.ctx_Registers(self.mem): # to sandbox globals
|
| 395 | named_args = {} # type: Dict[str, value_t]
|
| 396 | arg_list = ArgList.CreateNull() # There's no call site
|
| 397 | rd = typed_args.Reader(pos_args, named_args, None, arg_list)
|
| 398 |
|
| 399 | try:
|
| 400 | val = func_proc.CallUserFunc(func_val, rd, self.mem,
|
| 401 | self.cmd_ev)
|
| 402 | except error.FatalRuntime as e:
|
| 403 | val = value.Str('<Runtime error: %s>' %
|
| 404 | e.UserErrorString())
|
| 405 |
|
| 406 | except (IOError, OSError) as e:
|
| 407 | val = value.Str('<I/O error: %s>' % pyutil.strerror(e))
|
| 408 |
|
| 409 | except KeyboardInterrupt:
|
| 410 | val = value.Str('<Ctrl-C>')
|
| 411 |
|
| 412 | return val
|
| 413 |
|
| 414 | def CallConvertFunc(self, func_val, arg, convert_tok, call_loc):
|
| 415 | # type: (value_t, value_t, Token, loc_t) -> value_t
|
| 416 | """ For Eggex captures """
|
| 417 | with state.ctx_YshExpr(self.mutable_opts):
|
| 418 | pos_args = [arg]
|
| 419 | named_args = {} # type: Dict[str, value_t]
|
| 420 | arg_list = ArgList.CreateNull() # There's no call site
|
| 421 | rd = typed_args.Reader(pos_args, named_args, None, arg_list)
|
| 422 | rd.SetFallbackLocation(convert_tok)
|
| 423 | try:
|
| 424 | val = self._CallFunc(func_val, rd)
|
| 425 | except error.FatalRuntime as e:
|
| 426 | func_name = lexer.TokenVal(convert_tok)
|
| 427 | self.errfmt.Print_(
|
| 428 | 'Fatal error calling Eggex conversion func %r from this Match accessor'
|
| 429 | % func_name, call_loc)
|
| 430 | print_stderr('')
|
| 431 | raise
|
| 432 |
|
| 433 | return val
|
| 434 |
|
| 435 | def SpliceValue(self, val, part):
|
| 436 | # type: (value_t, word_part.Splice) -> List[str]
|
| 437 | """ write -- @myvar """
|
| 438 | return val_ops.ToShellArray(val, loc.WordPart(part), prefix='Splice ')
|
| 439 |
|
| 440 | def _EvalConst(self, node):
|
| 441 | # type: (expr.Const) -> value_t
|
| 442 | return node.val
|
| 443 |
|
| 444 | def _EvalUnary(self, node):
|
| 445 | # type: (expr.Unary) -> value_t
|
| 446 |
|
| 447 | val = self._EvalExpr(node.child)
|
| 448 |
|
| 449 | with switch(node.op.id) as case:
|
| 450 | if case(Id.Arith_Minus):
|
| 451 | c1, i1, f1 = _ConvertToNumber(val)
|
| 452 | if c1 == coerced_e.Int:
|
| 453 | return value.Int(mops.Negate(i1))
|
| 454 | if c1 == coerced_e.Float:
|
| 455 | return value.Float(-f1)
|
| 456 | raise error.TypeErr(val, 'Negation expected Int or Float',
|
| 457 | node.op)
|
| 458 |
|
| 459 | elif case(Id.Arith_Tilde):
|
| 460 | i = _ConvertToInt(val, '~ expected Int', node.op)
|
| 461 | return value.Int(mops.BitNot(i))
|
| 462 |
|
| 463 | elif case(Id.Expr_Not):
|
| 464 | b = val_ops.ToBool(val)
|
| 465 | return value.Bool(False if b else True)
|
| 466 |
|
| 467 | # &s &a[0] &d.key &d.nested.other
|
| 468 | elif case(Id.Arith_Amp):
|
| 469 | # Only 3 possibilities:
|
| 470 | # - expr.Var
|
| 471 | # - expr.Attribute with `.` operator (d.key)
|
| 472 | # - expr.SubScript
|
| 473 | #
|
| 474 | # See _EvalLhsExpr, which gives you y_lvalue
|
| 475 |
|
| 476 | # TODO: &x, &a[0], &d.key, creates a value.Place?
|
| 477 | # If it's Attribute or SubScript, you don't evaluate them.
|
| 478 | # y_lvalue_t -> place_t
|
| 479 |
|
| 480 | raise NotImplementedError(node.op)
|
| 481 |
|
| 482 | else:
|
| 483 | raise AssertionError(node.op)
|
| 484 |
|
| 485 | raise AssertionError('for C++ compiler')
|
| 486 |
|
| 487 | def _ArithIntFloat(self, left, right, op):
|
| 488 | # type: (value_t, value_t, Token) -> value_t
|
| 489 | """
|
| 490 | Note: may be replaced with arithmetic on tagged integers, e.g. 60 bit
|
| 491 | with overflow detection
|
| 492 | """
|
| 493 | c, i1, i2, f1, f2 = _ConvertForBinaryOp(left, right)
|
| 494 |
|
| 495 | op_id = op.id
|
| 496 |
|
| 497 | if c == coerced_e.Int:
|
| 498 | with switch(op_id) as case:
|
| 499 | if case(Id.Arith_Plus, Id.Arith_PlusEqual):
|
| 500 | return value.Int(mops.Add(i1, i2))
|
| 501 | elif case(Id.Arith_Minus, Id.Arith_MinusEqual):
|
| 502 | return value.Int(mops.Sub(i1, i2))
|
| 503 | elif case(Id.Arith_Star, Id.Arith_StarEqual):
|
| 504 | return value.Int(mops.Mul(i1, i2))
|
| 505 | elif case(Id.Arith_Slash, Id.Arith_SlashEqual):
|
| 506 | if mops.Equal(i2, mops.ZERO):
|
| 507 | raise error.Expr('Divide by zero', op)
|
| 508 | return value.Float(mops.ToFloat(i1) / mops.ToFloat(i2))
|
| 509 | else:
|
| 510 | raise AssertionError()
|
| 511 |
|
| 512 | elif c == coerced_e.Float:
|
| 513 | with switch(op_id) as case:
|
| 514 | if case(Id.Arith_Plus, Id.Arith_PlusEqual):
|
| 515 | return value.Float(f1 + f2)
|
| 516 | elif case(Id.Arith_Minus, Id.Arith_MinusEqual):
|
| 517 | return value.Float(f1 - f2)
|
| 518 | elif case(Id.Arith_Star, Id.Arith_StarEqual):
|
| 519 | return value.Float(f1 * f2)
|
| 520 | elif case(Id.Arith_Slash, Id.Arith_SlashEqual):
|
| 521 | if f2 == 0.0:
|
| 522 | raise error.Expr('Divide by zero', op)
|
| 523 | return value.Float(f1 / f2)
|
| 524 | else:
|
| 525 | raise AssertionError()
|
| 526 |
|
| 527 | else:
|
| 528 | raise error.TypeErrVerbose(
|
| 529 | 'Binary operator expected numbers, got %s and %s (OILS-ERR-201)'
|
| 530 | % (ui.ValType(left), ui.ValType(right)), op)
|
| 531 |
|
| 532 | def _ArithIntOnly(self, left, right, op):
|
| 533 | # type: (value_t, value_t, Token) -> value_t
|
| 534 |
|
| 535 | i1 = _ConvertToInt(left, 'Left operand should be Int', op)
|
| 536 | i2 = _ConvertToInt(right, 'Right operand should be Int', op)
|
| 537 |
|
| 538 | with switch(op.id) as case:
|
| 539 |
|
| 540 | # a % b setvar a %= b
|
| 541 | if case(Id.Arith_Percent, Id.Arith_PercentEqual):
|
| 542 | if mops.Equal(i2, mops.ZERO):
|
| 543 | raise error.Expr('Divide by zero', op)
|
| 544 | if mops.Greater(mops.ZERO, i2):
|
| 545 | # Disallow this to remove confusion between modulus and remainder
|
| 546 | raise error.Expr("Divisor can't be negative", op)
|
| 547 |
|
| 548 | return value.Int(mops.Rem(i1, i2))
|
| 549 |
|
| 550 | # a // b setvar a //= b
|
| 551 | elif case(Id.Expr_DSlash, Id.Expr_DSlashEqual):
|
| 552 | if mops.Equal(i2, mops.ZERO):
|
| 553 | raise error.Expr('Divide by zero', op)
|
| 554 | return value.Int(mops.Div(i1, i2))
|
| 555 |
|
| 556 | # a ** b setvar a **= b (ysh only)
|
| 557 | elif case(Id.Arith_DStar, Id.Expr_DStarEqual):
|
| 558 | # Same as sh_expr_eval.py
|
| 559 | if mops.Greater(mops.ZERO, i2):
|
| 560 | raise error.Expr("Exponent can't be a negative number", op)
|
| 561 | return value.Int(num.Exponent(i1, i2))
|
| 562 |
|
| 563 | # Bitwise
|
| 564 | elif case(Id.Arith_Amp, Id.Arith_AmpEqual): # &
|
| 565 | return value.Int(mops.BitAnd(i1, i2))
|
| 566 |
|
| 567 | elif case(Id.Arith_Pipe, Id.Arith_PipeEqual): # |
|
| 568 | return value.Int(mops.BitOr(i1, i2))
|
| 569 |
|
| 570 | elif case(Id.Arith_Caret, Id.Arith_CaretEqual): # ^
|
| 571 | return value.Int(mops.BitXor(i1, i2))
|
| 572 |
|
| 573 | elif case(Id.Arith_DGreat, Id.Arith_DGreatEqual): # >>
|
| 574 | if mops.Greater(mops.ZERO, i2): # i2 < 0
|
| 575 | raise error.Expr("Can't right shift by negative number",
|
| 576 | op)
|
| 577 | return value.Int(mops.RShift(i1, i2))
|
| 578 |
|
| 579 | elif case(Id.Arith_DLess, Id.Arith_DLessEqual): # <<
|
| 580 | if mops.Greater(mops.ZERO, i2): # i2 < 0
|
| 581 | raise error.Expr("Can't left shift by negative number", op)
|
| 582 | return value.Int(mops.LShift(i1, i2))
|
| 583 |
|
| 584 | else:
|
| 585 | raise AssertionError(op.id)
|
| 586 |
|
| 587 | def _Concat(self, left, right, op):
|
| 588 | # type: (value_t, value_t, Token) -> value_t
|
| 589 | UP_left = left
|
| 590 | UP_right = right
|
| 591 |
|
| 592 | if left.tag() == value_e.Str and right.tag() == value_e.Str:
|
| 593 | left = cast(value.Str, UP_left)
|
| 594 | right = cast(value.Str, UP_right)
|
| 595 |
|
| 596 | return value.Str(left.s + right.s)
|
| 597 |
|
| 598 | elif left.tag() == value_e.List and right.tag() == value_e.List:
|
| 599 | left = cast(value.List, UP_left)
|
| 600 | right = cast(value.List, UP_right)
|
| 601 |
|
| 602 | c = list(left.items) # mycpp rewrite of L1 + L2
|
| 603 | c.extend(right.items)
|
| 604 | return value.List(c)
|
| 605 |
|
| 606 | else:
|
| 607 | raise error.TypeErrVerbose(
|
| 608 | 'Expected Str ++ Str or List ++ List, got %s ++ %s' %
|
| 609 | (ui.ValType(left), ui.ValType(right)), op)
|
| 610 |
|
| 611 | def _EvalBinary(self, node):
|
| 612 | # type: (expr.Binary) -> value_t
|
| 613 |
|
| 614 | left = self._EvalExpr(node.left)
|
| 615 |
|
| 616 | # Logical and/or lazily evaluate
|
| 617 | with switch(node.op.id) as case:
|
| 618 | if case(Id.Expr_And):
|
| 619 | if val_ops.ToBool(left): # no errors
|
| 620 | return self._EvalExpr(node.right)
|
| 621 | else:
|
| 622 | return left
|
| 623 |
|
| 624 | elif case(Id.Expr_Or):
|
| 625 | if val_ops.ToBool(left):
|
| 626 | return left
|
| 627 | else:
|
| 628 | return self._EvalExpr(node.right)
|
| 629 |
|
| 630 | # These operators all eagerly evaluate
|
| 631 | right = self._EvalExpr(node.right)
|
| 632 |
|
| 633 | with switch(node.op.id) as case:
|
| 634 | if case(Id.Arith_DPlus): # a ++ b to concat Str or List
|
| 635 | return self._Concat(left, right, node.op)
|
| 636 |
|
| 637 | elif case(Id.Arith_Plus, Id.Arith_Minus, Id.Arith_Star,
|
| 638 | Id.Arith_Slash):
|
| 639 | return self._ArithIntFloat(left, right, node.op)
|
| 640 |
|
| 641 | else:
|
| 642 | return self._ArithIntOnly(left, right, node.op)
|
| 643 |
|
| 644 | def _CompareNumeric(self, left, right, op):
|
| 645 | # type: (value_t, value_t, Token) -> bool
|
| 646 | c, i1, i2, f1, f2 = _ConvertForBinaryOp(left, right)
|
| 647 |
|
| 648 | if c == coerced_e.Int:
|
| 649 | with switch(op.id) as case:
|
| 650 | if case(Id.Arith_Less):
|
| 651 | return mops.Greater(i2, i1)
|
| 652 | elif case(Id.Arith_Great):
|
| 653 | return mops.Greater(i1, i2)
|
| 654 | elif case(Id.Arith_LessEqual):
|
| 655 | return mops.Greater(i2, i1) or mops.Equal(i1, i2)
|
| 656 | elif case(Id.Arith_GreatEqual):
|
| 657 | return mops.Greater(i1, i2) or mops.Equal(i1, i2)
|
| 658 | else:
|
| 659 | raise AssertionError()
|
| 660 |
|
| 661 | elif c == coerced_e.Float:
|
| 662 | with switch(op.id) as case:
|
| 663 | if case(Id.Arith_Less):
|
| 664 | return f1 < f2
|
| 665 | elif case(Id.Arith_Great):
|
| 666 | return f1 > f2
|
| 667 | elif case(Id.Arith_LessEqual):
|
| 668 | return f1 <= f2
|
| 669 | elif case(Id.Arith_GreatEqual):
|
| 670 | return f1 >= f2
|
| 671 | else:
|
| 672 | raise AssertionError()
|
| 673 |
|
| 674 | else:
|
| 675 | raise error.TypeErrVerbose(
|
| 676 | 'Comparison operator expected numbers, got %s and %s' %
|
| 677 | (ui.ValType(left), ui.ValType(right)), op)
|
| 678 |
|
| 679 | def _EvalCompare(self, node):
|
| 680 | # type: (expr.Compare) -> value_t
|
| 681 |
|
| 682 | left = self._EvalExpr(node.left)
|
| 683 | result = True # Implicit and
|
| 684 | for i, op in enumerate(node.ops):
|
| 685 | right_expr = node.comparators[i]
|
| 686 |
|
| 687 | right = self._EvalExpr(right_expr)
|
| 688 |
|
| 689 | if op.id in (Id.Arith_Less, Id.Arith_Great, Id.Arith_LessEqual,
|
| 690 | Id.Arith_GreatEqual):
|
| 691 | result = self._CompareNumeric(left, right, op)
|
| 692 |
|
| 693 | elif op.id == Id.Expr_TEqual:
|
| 694 | result = val_ops.ExactlyEqual(left, right, op)
|
| 695 | elif op.id == Id.Expr_NotDEqual:
|
| 696 | result = not val_ops.ExactlyEqual(left, right, op)
|
| 697 |
|
| 698 | elif op.id == Id.Expr_In:
|
| 699 | result = val_ops.Contains(left, right)
|
| 700 | elif op.id == Id.Node_NotIn:
|
| 701 | result = not val_ops.Contains(left, right)
|
| 702 |
|
| 703 | elif op.id == Id.Expr_Is:
|
| 704 | if left.tag() != right.tag():
|
| 705 | raise error.TypeErrVerbose('Mismatched types', op)
|
| 706 | result = left is right
|
| 707 |
|
| 708 | elif op.id == Id.Node_IsNot:
|
| 709 | if left.tag() != right.tag():
|
| 710 | raise error.TypeErrVerbose('Mismatched types', op)
|
| 711 | result = left is not right
|
| 712 |
|
| 713 | elif op.id == Id.Expr_DTilde:
|
| 714 | # no extglob in Oil language; use eggex
|
| 715 | if left.tag() != value_e.Str:
|
| 716 | raise error.TypeErrVerbose('LHS must be Str', op)
|
| 717 |
|
| 718 | if right.tag() != value_e.Str:
|
| 719 | raise error.TypeErrVerbose('RHS must be Str', op)
|
| 720 |
|
| 721 | UP_left = left
|
| 722 | UP_right = right
|
| 723 | left = cast(value.Str, UP_left)
|
| 724 | right = cast(value.Str, UP_right)
|
| 725 | return value.Bool(libc.fnmatch(right.s, left.s))
|
| 726 |
|
| 727 | elif op.id == Id.Expr_NotDTilde:
|
| 728 | if left.tag() != value_e.Str:
|
| 729 | raise error.TypeErrVerbose('LHS must be Str', op)
|
| 730 |
|
| 731 | if right.tag() != value_e.Str:
|
| 732 | raise error.TypeErrVerbose('RHS must be Str', op)
|
| 733 |
|
| 734 | UP_left = left
|
| 735 | UP_right = right
|
| 736 | left = cast(value.Str, UP_left)
|
| 737 | right = cast(value.Str, UP_right)
|
| 738 | return value.Bool(not libc.fnmatch(right.s, left.s))
|
| 739 |
|
| 740 | elif op.id == Id.Expr_TildeDEqual:
|
| 741 | # Approximate equality
|
| 742 | UP_left = left
|
| 743 | if left.tag() != value_e.Str:
|
| 744 | e_die('~== expects a string on the left', op)
|
| 745 |
|
| 746 | left = cast(value.Str, UP_left)
|
| 747 | left2 = left.s.strip()
|
| 748 |
|
| 749 | UP_right = right
|
| 750 | with tagswitch(right) as case:
|
| 751 | if case(value_e.Str):
|
| 752 | right = cast(value.Str, UP_right)
|
| 753 | return value.Bool(left2 == right.s)
|
| 754 |
|
| 755 | elif case(value_e.Bool):
|
| 756 | right = cast(value.Bool, UP_right)
|
| 757 | left2 = left2.lower()
|
| 758 | lb = False
|
| 759 | if left2 == 'true':
|
| 760 | lb = True
|
| 761 | elif left2 == 'false':
|
| 762 | lb = False
|
| 763 | else:
|
| 764 | return value.Bool(False)
|
| 765 |
|
| 766 | #log('left %r left2 %r', left, left2)
|
| 767 | return value.Bool(lb == right.b)
|
| 768 |
|
| 769 | elif case(value_e.Int):
|
| 770 | right = cast(value.Int, UP_right)
|
| 771 | if not left2.isdigit():
|
| 772 | return value.Bool(False)
|
| 773 |
|
| 774 | eq = mops.Equal(mops.FromStr(left2), right.i)
|
| 775 | return value.Bool(eq)
|
| 776 |
|
| 777 | e_die('~== expects Str, Int, or Bool on the right', op)
|
| 778 |
|
| 779 | else:
|
| 780 | try:
|
| 781 | if op.id == Id.Arith_Tilde:
|
| 782 | result = val_ops.MatchRegex(left, right, self.mem)
|
| 783 |
|
| 784 | elif op.id == Id.Expr_NotTilde:
|
| 785 | # don't pass self.mem to not set a match
|
| 786 | result = not val_ops.MatchRegex(left, right, None)
|
| 787 |
|
| 788 | else:
|
| 789 | raise AssertionError(op)
|
| 790 | except ValueError as e:
|
| 791 | # Status 2 indicates a regex parse error, as with [[ in OSH
|
| 792 | e_die_status(2, e.message, op)
|
| 793 |
|
| 794 | if not result:
|
| 795 | return value.Bool(result)
|
| 796 |
|
| 797 | left = right
|
| 798 |
|
| 799 | return value.Bool(result)
|
| 800 |
|
| 801 | def _CallFunc(self, to_call, rd):
|
| 802 | # type: (value_t, typed_args.Reader) -> value_t
|
| 803 |
|
| 804 | # Now apply args to either builtin or user-defined function
|
| 805 | UP_to_call = to_call
|
| 806 | with tagswitch(to_call) as case:
|
| 807 | if case(value_e.Func):
|
| 808 | to_call = cast(value.Func, UP_to_call)
|
| 809 |
|
| 810 | return func_proc.CallUserFunc(to_call, rd, self.mem,
|
| 811 | self.cmd_ev)
|
| 812 |
|
| 813 | elif case(value_e.BuiltinFunc):
|
| 814 | to_call = cast(value.BuiltinFunc, UP_to_call)
|
| 815 |
|
| 816 | # C++ cast to work around ASDL 'any'
|
| 817 | f = cast(vm._Callable, to_call.callable)
|
| 818 | return f.Call(rd)
|
| 819 | else:
|
| 820 | raise AssertionError("Shouldn't have been bound")
|
| 821 |
|
| 822 | def _EvalFuncCall(self, node):
|
| 823 | # type: (expr.FuncCall) -> value_t
|
| 824 |
|
| 825 | func = self._EvalExpr(node.func)
|
| 826 | UP_func = func
|
| 827 |
|
| 828 | # The () operator has a 2x2 matrix of
|
| 829 | # (free, bound) x (builtin, user-defined)
|
| 830 |
|
| 831 | # Eval args first
|
| 832 | with tagswitch(func) as case:
|
| 833 | if case(value_e.Func, value_e.BuiltinFunc):
|
| 834 | to_call = func
|
| 835 | pos_args, named_args = func_proc._EvalArgList(self, node.args)
|
| 836 | rd = typed_args.Reader(pos_args, named_args, None, node.args)
|
| 837 |
|
| 838 | elif case(value_e.BoundFunc):
|
| 839 | func = cast(value.BoundFunc, UP_func)
|
| 840 |
|
| 841 | to_call = func.func
|
| 842 | pos_args, named_args = func_proc._EvalArgList(self,
|
| 843 | node.args,
|
| 844 | me=func.me)
|
| 845 | rd = typed_args.Reader(pos_args,
|
| 846 | named_args,
|
| 847 | None,
|
| 848 | node.args,
|
| 849 | is_bound=True)
|
| 850 | else:
|
| 851 | raise error.TypeErr(func, 'Expected a function or method',
|
| 852 | node.args.left)
|
| 853 |
|
| 854 | return self._CallFunc(to_call, rd)
|
| 855 |
|
| 856 | def _EvalSubscript(self, obj, index):
|
| 857 | # type: (value_t, value_t) -> value_t
|
| 858 |
|
| 859 | UP_obj = obj
|
| 860 | UP_index = index
|
| 861 |
|
| 862 | with tagswitch(obj) as case:
|
| 863 | if case(value_e.Str):
|
| 864 | # Note: s[i] and s[i:j] are like Go, on bytes. We may provide
|
| 865 | # s->numBytes(), s->countRunes(), and iteration over runes.
|
| 866 | obj = cast(value.Str, UP_obj)
|
| 867 | with tagswitch(index) as case2:
|
| 868 | if case2(value_e.Slice):
|
| 869 | index = cast(value.Slice, UP_index)
|
| 870 |
|
| 871 | lower = index.lower.i if index.lower else 0
|
| 872 | upper = index.upper.i if index.upper else len(obj.s)
|
| 873 | return value.Str(obj.s[lower:upper])
|
| 874 |
|
| 875 | elif case2(value_e.Int):
|
| 876 | index = cast(value.Int, UP_index)
|
| 877 | i = mops.BigTruncate(index.i)
|
| 878 | try:
|
| 879 | return value.Str(obj.s[i])
|
| 880 | except IndexError:
|
| 881 | # TODO: expr.Subscript has no error location
|
| 882 | raise error.Expr('index out of range', loc.Missing)
|
| 883 |
|
| 884 | else:
|
| 885 | raise error.TypeErr(index,
|
| 886 | 'Str index expected Int or Slice',
|
| 887 | loc.Missing)
|
| 888 |
|
| 889 | elif case(value_e.List):
|
| 890 | obj = cast(value.List, UP_obj)
|
| 891 | with tagswitch(index) as case2:
|
| 892 | if case2(value_e.Slice):
|
| 893 | index = cast(value.Slice, UP_index)
|
| 894 |
|
| 895 | lower = index.lower.i if index.lower else 0
|
| 896 | upper = index.upper.i if index.upper else len(
|
| 897 | obj.items)
|
| 898 | return value.List(obj.items[lower:upper])
|
| 899 |
|
| 900 | elif case2(value_e.Int):
|
| 901 | index = cast(value.Int, UP_index)
|
| 902 | i = mops.BigTruncate(index.i)
|
| 903 | try:
|
| 904 | return obj.items[i]
|
| 905 | except IndexError:
|
| 906 | # TODO: expr.Subscript has no error location
|
| 907 | raise error.Expr('List index out of range: %d' % i,
|
| 908 | loc.Missing)
|
| 909 |
|
| 910 | else:
|
| 911 | raise error.TypeErr(
|
| 912 | index, 'List index expected Int or Slice',
|
| 913 | loc.Missing)
|
| 914 |
|
| 915 | elif case(value_e.Dict):
|
| 916 | obj = cast(value.Dict, UP_obj)
|
| 917 | if index.tag() != value_e.Str:
|
| 918 | raise error.TypeErr(index, 'Dict index expected Str',
|
| 919 | loc.Missing)
|
| 920 |
|
| 921 | index = cast(value.Str, UP_index)
|
| 922 | try:
|
| 923 | return obj.d[index.s]
|
| 924 | except KeyError:
|
| 925 | # TODO: expr.Subscript has no error location
|
| 926 | raise error.Expr('Dict entry not found: %r' % index.s,
|
| 927 | loc.Missing)
|
| 928 |
|
| 929 | raise error.TypeErr(obj, 'Subscript expected Str, List, or Dict',
|
| 930 | loc.Missing)
|
| 931 |
|
| 932 | def _ChainedLookup(self, obj, current, attr_name):
|
| 933 | # type: (Obj, Obj, str) -> Optional[value_t]
|
| 934 | """Prototype chain lookup.
|
| 935 |
|
| 936 | Args:
|
| 937 | obj: properties we might bind to
|
| 938 | current: our location in the prototype chain
|
| 939 | """
|
| 940 | val = current.d.get(attr_name)
|
| 941 | if val is not None:
|
| 942 | # Special bound method logic for objects, but NOT modules
|
| 943 | if val.tag() in (value_e.Func, value_e.BuiltinFunc):
|
| 944 | return value.BoundFunc(obj, val)
|
| 945 | else:
|
| 946 | return val
|
| 947 |
|
| 948 | if current.prototype is not None:
|
| 949 | return self._ChainedLookup(obj, current.prototype, attr_name)
|
| 950 |
|
| 951 | return None
|
| 952 |
|
| 953 | def _EvalDot(self, node, obj):
|
| 954 | # type: (Attribute, value_t) -> value_t
|
| 955 | """ obj.attr on RHS or LHS
|
| 956 |
|
| 957 | setvar x = obj.attr
|
| 958 | setglobal g[obj.attr] = 42
|
| 959 | """
|
| 960 | UP_obj = obj
|
| 961 | with tagswitch(obj) as case:
|
| 962 | if case(value_e.Dict):
|
| 963 | obj = cast(Obj, UP_obj)
|
| 964 | attr_name = node.attr_name
|
| 965 |
|
| 966 | # Dict key / normal attribute lookup
|
| 967 | result = obj.d.get(attr_name)
|
| 968 | if result is not None:
|
| 969 | return result
|
| 970 |
|
| 971 | raise error.Expr('Dict entry %r not found' % attr_name,
|
| 972 | node.op)
|
| 973 |
|
| 974 | elif case(value_e.Obj):
|
| 975 | obj = cast(Obj, UP_obj)
|
| 976 | attr_name = node.attr_name
|
| 977 |
|
| 978 | # Dict key / normal attribute lookup
|
| 979 | result = obj.d.get(attr_name)
|
| 980 | if result is not None:
|
| 981 | return result
|
| 982 |
|
| 983 | # Prototype lookup - with special logic for BoundMethod
|
| 984 | if obj.prototype is not None:
|
| 985 | result = self._ChainedLookup(obj, obj.prototype, attr_name)
|
| 986 | if result is not None:
|
| 987 | return result
|
| 988 |
|
| 989 | raise error.Expr('Obj attribute %r not found' % attr_name,
|
| 990 | node.op)
|
| 991 |
|
| 992 | else:
|
| 993 | raise error.TypeErr(obj, 'Dot operator expected Dict', node.op)
|
| 994 |
|
| 995 | raise AssertionError()
|
| 996 |
|
| 997 | def _EvalAttribute(self, node):
|
| 998 | # type: (Attribute) -> value_t
|
| 999 |
|
| 1000 | o = self._EvalExpr(node.obj)
|
| 1001 | UP_o = o
|
| 1002 |
|
| 1003 | with switch(node.op.id) as case:
|
| 1004 | # Right now => is a synonym for ->
|
| 1005 | # Later we may enforce that => is pure, and -> is for mutation and
|
| 1006 | # I/O.
|
| 1007 | if case(Id.Expr_RArrow, Id.Expr_RDArrow):
|
| 1008 | name = node.attr_name
|
| 1009 | # Look up builtin methods
|
| 1010 | type_methods = self.methods.get(o.tag())
|
| 1011 | vm_callable = (type_methods.get(name)
|
| 1012 | if type_methods is not None else None)
|
| 1013 | if vm_callable:
|
| 1014 | func_val = value.BuiltinFunc(vm_callable)
|
| 1015 | return value.BoundFunc(o, func_val)
|
| 1016 |
|
| 1017 | # If the operator is ->, fail because we don't have any
|
| 1018 | # user-defined methods
|
| 1019 | if node.op.id == Id.Expr_RArrow:
|
| 1020 | raise error.TypeErrVerbose(
|
| 1021 | 'Method %r does not exist on type %s' %
|
| 1022 | (name, ui.ValType(o)), node.attr)
|
| 1023 |
|
| 1024 | # Operator is =>, so try function chaining.
|
| 1025 |
|
| 1026 | # Instead of str(f()) => upper()
|
| 1027 | # or str(f()).upper() as in Pythohn
|
| 1028 | #
|
| 1029 | # It's more natural to write
|
| 1030 | # f() => str() => upper()
|
| 1031 |
|
| 1032 | # Could improve error message: may give "Undefined variable"
|
| 1033 | val = self._LookupVar(name, node.attr)
|
| 1034 |
|
| 1035 | with tagswitch(val) as case2:
|
| 1036 | if case2(value_e.Func, value_e.BuiltinFunc):
|
| 1037 | return value.BoundFunc(o, val)
|
| 1038 | else:
|
| 1039 | raise error.TypeErr(
|
| 1040 | val, 'Fat arrow => expects method or function',
|
| 1041 | node.attr)
|
| 1042 |
|
| 1043 | elif case(Id.Expr_Dot): # d.key is like d['key']
|
| 1044 | return self._EvalDot(node, o)
|
| 1045 |
|
| 1046 | else:
|
| 1047 | raise AssertionError(node.op)
|
| 1048 |
|
| 1049 | def _EvalExpr(self, node):
|
| 1050 | # type: (expr_t) -> value_t
|
| 1051 | """Turn an expression into a value."""
|
| 1052 | if 0:
|
| 1053 | print('_EvalExpr()')
|
| 1054 | node.PrettyPrint()
|
| 1055 | print('')
|
| 1056 |
|
| 1057 | UP_node = node
|
| 1058 | with tagswitch(node) as case:
|
| 1059 | if case(expr_e.Const):
|
| 1060 | node = cast(expr.Const, UP_node)
|
| 1061 | return self._EvalConst(node)
|
| 1062 |
|
| 1063 | elif case(expr_e.Var):
|
| 1064 | node = cast(expr.Var, UP_node)
|
| 1065 | return self._LookupVar(node.name, node.left)
|
| 1066 |
|
| 1067 | elif case(expr_e.Place):
|
| 1068 | node = cast(expr.Place, UP_node)
|
| 1069 | frame = self.mem.TopNamespace()
|
| 1070 | return value.Place(LeftName(node.var_name, node.blame_tok),
|
| 1071 | frame)
|
| 1072 |
|
| 1073 | elif case(expr_e.CommandSub):
|
| 1074 | node = cast(CommandSub, UP_node)
|
| 1075 |
|
| 1076 | id_ = node.left_token.id
|
| 1077 | if id_ == Id.Left_CaretParen: # ^(echo block literal)
|
| 1078 | # TODO: Propgate location info?
|
| 1079 | return value.Command(node.child)
|
| 1080 | else:
|
| 1081 | stdout_str = self.shell_ex.RunCommandSub(node)
|
| 1082 | if id_ == Id.Left_AtParen: # @(seq 3)
|
| 1083 | # YSH splitting algorithm: does not depend on IFS
|
| 1084 | try:
|
| 1085 | strs = j8.SplitJ8Lines(stdout_str)
|
| 1086 | except error.Decode as e:
|
| 1087 | # status code 4 is special, for encode/decode errors.
|
| 1088 | raise error.Structured(4, e.Message(),
|
| 1089 | node.left_token)
|
| 1090 |
|
| 1091 | #strs = self.splitter.SplitForWordEval(stdout_str)
|
| 1092 |
|
| 1093 | items = [value.Str(s)
|
| 1094 | for s in strs] # type: List[value_t]
|
| 1095 | return value.List(items)
|
| 1096 | else:
|
| 1097 | return value.Str(stdout_str)
|
| 1098 |
|
| 1099 | elif case(expr_e.ShArrayLiteral): # var x = :| foo *.py |
|
| 1100 | node = cast(ShArrayLiteral, UP_node)
|
| 1101 | words = braces.BraceExpandWords(node.words)
|
| 1102 | strs = self.word_ev.EvalWordSequence(words)
|
| 1103 | #log('ARRAY LITERAL EVALUATED TO -> %s', strs)
|
| 1104 | #return value.BashArray(strs)
|
| 1105 |
|
| 1106 | # It's equivalent to ['foo', 'bar']
|
| 1107 | items = [value.Str(s) for s in strs]
|
| 1108 | return value.List(items)
|
| 1109 |
|
| 1110 | elif case(expr_e.DoubleQuoted):
|
| 1111 | node = cast(DoubleQuoted, UP_node)
|
| 1112 | # In an ideal world, YSH would *statically* disallow:
|
| 1113 | #
|
| 1114 | # - "$@" and "${array[@]}"
|
| 1115 | # - backticks like `echo hi`
|
| 1116 | # - $(( 1+2 )) and $[] -- although useful for refactoring
|
| 1117 | # - not sure: ${x%%} -- could disallow this
|
| 1118 | # - these enters the ArgDQ state: "${a:-foo bar}" ?
|
| 1119 | #
|
| 1120 | # But that would complicate the parser/evaluator. So just rely
|
| 1121 | # on runtime strict_array to disallow the bad parts.
|
| 1122 | return value.Str(self.word_ev.EvalDoubleQuotedToString(node))
|
| 1123 |
|
| 1124 | elif case(expr_e.SingleQuoted):
|
| 1125 | node = cast(SingleQuoted, UP_node)
|
| 1126 | return value.Str(node.sval)
|
| 1127 |
|
| 1128 | elif case(expr_e.BracedVarSub):
|
| 1129 | node = cast(BracedVarSub, UP_node)
|
| 1130 | return value.Str(self.word_ev.EvalBracedVarSubToString(node))
|
| 1131 |
|
| 1132 | elif case(expr_e.SimpleVarSub):
|
| 1133 | node = cast(SimpleVarSub, UP_node)
|
| 1134 | return value.Str(self.word_ev.EvalSimpleVarSubToString(node))
|
| 1135 |
|
| 1136 | elif case(expr_e.Unary):
|
| 1137 | node = cast(expr.Unary, UP_node)
|
| 1138 | return self._EvalUnary(node)
|
| 1139 |
|
| 1140 | elif case(expr_e.Binary):
|
| 1141 | node = cast(expr.Binary, UP_node)
|
| 1142 | return self._EvalBinary(node)
|
| 1143 |
|
| 1144 | elif case(expr_e.Slice): # a[:0]
|
| 1145 | node = cast(expr.Slice, UP_node)
|
| 1146 |
|
| 1147 | lower = None # type: Optional[IntBox]
|
| 1148 | upper = None # type: Optional[IntBox]
|
| 1149 |
|
| 1150 | if node.lower:
|
| 1151 | msg = 'Slice begin should be Int'
|
| 1152 | i = val_ops.ToInt(self._EvalExpr(node.lower), msg,
|
| 1153 | loc.Missing)
|
| 1154 | lower = IntBox(i)
|
| 1155 |
|
| 1156 | if node.upper:
|
| 1157 | msg = 'Slice end should be Int'
|
| 1158 | i = val_ops.ToInt(self._EvalExpr(node.upper), msg,
|
| 1159 | loc.Missing)
|
| 1160 | upper = IntBox(i)
|
| 1161 |
|
| 1162 | return value.Slice(lower, upper)
|
| 1163 |
|
| 1164 | elif case(expr_e.Range):
|
| 1165 | node = cast(expr.Range, UP_node)
|
| 1166 |
|
| 1167 | assert node.lower is not None
|
| 1168 | assert node.upper is not None
|
| 1169 |
|
| 1170 | msg = 'Range begin should be Int'
|
| 1171 | i = val_ops.ToInt(self._EvalExpr(node.lower), msg, loc.Missing)
|
| 1172 |
|
| 1173 | msg = 'Range end should be Int'
|
| 1174 | j = val_ops.ToInt(self._EvalExpr(node.upper), msg, loc.Missing)
|
| 1175 |
|
| 1176 | return value.Range(i, j)
|
| 1177 |
|
| 1178 | elif case(expr_e.Compare):
|
| 1179 | node = cast(expr.Compare, UP_node)
|
| 1180 | return self._EvalCompare(node)
|
| 1181 |
|
| 1182 | elif case(expr_e.IfExp):
|
| 1183 | node = cast(expr.IfExp, UP_node)
|
| 1184 | b = val_ops.ToBool(self._EvalExpr(node.test))
|
| 1185 | if b:
|
| 1186 | return self._EvalExpr(node.body)
|
| 1187 | else:
|
| 1188 | return self._EvalExpr(node.orelse)
|
| 1189 |
|
| 1190 | elif case(expr_e.List):
|
| 1191 | node = cast(expr.List, UP_node)
|
| 1192 | items = [self._EvalExpr(e) for e in node.elts]
|
| 1193 | return value.List(items)
|
| 1194 |
|
| 1195 | elif case(expr_e.Tuple):
|
| 1196 | node = cast(expr.Tuple, UP_node)
|
| 1197 | # YSH language: Tuple syntax evaluates to LIST !
|
| 1198 | items = [self._EvalExpr(e) for e in node.elts]
|
| 1199 | return value.List(items)
|
| 1200 |
|
| 1201 | elif case(expr_e.Dict):
|
| 1202 | node = cast(expr.Dict, UP_node)
|
| 1203 |
|
| 1204 | kvals = [self._EvalExpr(e) for e in node.keys]
|
| 1205 | values = [] # type: List[value_t]
|
| 1206 |
|
| 1207 | for i, value_expr in enumerate(node.values):
|
| 1208 | if value_expr.tag() == expr_e.Implicit: # {key}
|
| 1209 | # Enforced by parser. Key is expr.Const
|
| 1210 | assert kvals[i].tag() == value_e.Str, kvals[i]
|
| 1211 | key = cast(value.Str, kvals[i])
|
| 1212 | v = self._LookupVar(key.s, loc.Missing)
|
| 1213 | else:
|
| 1214 | v = self._EvalExpr(value_expr)
|
| 1215 |
|
| 1216 | values.append(v)
|
| 1217 |
|
| 1218 | d = NewDict() # type: Dict[str, value_t]
|
| 1219 | for i, kval in enumerate(kvals):
|
| 1220 | k = val_ops.ToStr(kval, 'Dict keys must be strings',
|
| 1221 | loc.Missing)
|
| 1222 | d[k] = values[i]
|
| 1223 |
|
| 1224 | return value.Dict(d)
|
| 1225 |
|
| 1226 | elif case(expr_e.ListComp):
|
| 1227 | e_die_status(
|
| 1228 | 2, 'List comprehension reserved but not implemented')
|
| 1229 |
|
| 1230 | elif case(expr_e.GeneratorExp):
|
| 1231 | e_die_status(
|
| 1232 | 2, 'Generator expression reserved but not implemented')
|
| 1233 |
|
| 1234 | elif case(expr_e.Literal): # ^[1 + 2]
|
| 1235 | node = cast(expr.Literal, UP_node)
|
| 1236 | return value.Expr(node.inner)
|
| 1237 |
|
| 1238 | elif case(expr_e.Lambda): # |x| x+1 syntax is reserved
|
| 1239 | # TODO: Location information for |, or func
|
| 1240 | # Note: anonymous functions also evaluate to a Lambda, but they shouldn't
|
| 1241 | e_die_status(2, 'Lambda reserved but not implemented')
|
| 1242 |
|
| 1243 | elif case(expr_e.FuncCall):
|
| 1244 | node = cast(expr.FuncCall, UP_node)
|
| 1245 | return self._EvalFuncCall(node)
|
| 1246 |
|
| 1247 | elif case(expr_e.Subscript):
|
| 1248 | node = cast(Subscript, UP_node)
|
| 1249 | obj = self._EvalExpr(node.obj)
|
| 1250 | index = self._EvalExpr(node.index)
|
| 1251 | return self._EvalSubscript(obj, index)
|
| 1252 |
|
| 1253 | elif case(expr_e.Attribute): # obj->method or mydict.key
|
| 1254 | node = cast(Attribute, UP_node)
|
| 1255 | return self._EvalAttribute(node)
|
| 1256 |
|
| 1257 | elif case(expr_e.Eggex):
|
| 1258 | node = cast(Eggex, UP_node)
|
| 1259 | return self.EvalEggex(node)
|
| 1260 |
|
| 1261 | else:
|
| 1262 | raise NotImplementedError(node.__class__.__name__)
|
| 1263 |
|
| 1264 | def EvalEggex(self, node):
|
| 1265 | # type: (Eggex) -> value.Eggex
|
| 1266 |
|
| 1267 | # Splice, check flags consistency, and accumulate convert_funcs indexed
|
| 1268 | # by capture group
|
| 1269 | ev = EggexEvaluator(self.mem, node.canonical_flags)
|
| 1270 | spliced = ev.EvalE(node.regex)
|
| 1271 |
|
| 1272 | # as_ere and capture_names filled by ~ operator or Str method
|
| 1273 | return value.Eggex(spliced, node.canonical_flags, ev.convert_funcs,
|
| 1274 | ev.convert_toks, None, [])
|
| 1275 |
|
| 1276 |
|
| 1277 | class EggexEvaluator(object):
|
| 1278 |
|
| 1279 | def __init__(self, mem, canonical_flags):
|
| 1280 | # type: (state.Mem, str) -> None
|
| 1281 | self.mem = mem
|
| 1282 | self.canonical_flags = canonical_flags
|
| 1283 | self.convert_funcs = [] # type: List[Optional[value_t]]
|
| 1284 | self.convert_toks = [] # type: List[Optional[Token]]
|
| 1285 |
|
| 1286 | def _LookupVar(self, name, var_loc):
|
| 1287 | # type: (str, loc_t) -> value_t
|
| 1288 | """
|
| 1289 | Duplicated from ExprEvaluator
|
| 1290 | """
|
| 1291 | return LookupVar(self.mem, name, scope_e.LocalOrGlobal, var_loc)
|
| 1292 |
|
| 1293 | def _EvalClassLiteralTerm(self, term, out):
|
| 1294 | # type: (class_literal_term_t, List[char_class_term_t]) -> None
|
| 1295 | UP_term = term
|
| 1296 |
|
| 1297 | # These 2 vars will be initialized if we don't return early
|
| 1298 | s = None # type: str
|
| 1299 | char_code_tok = None # type: Token
|
| 1300 |
|
| 1301 | with tagswitch(term) as case:
|
| 1302 |
|
| 1303 | if case(class_literal_term_e.CharCode):
|
| 1304 | term = cast(CharCode, UP_term)
|
| 1305 |
|
| 1306 | # What about \0? At runtime, ERE should disallow it. But we
|
| 1307 | # can also disallow it here.
|
| 1308 | out.append(term)
|
| 1309 | return
|
| 1310 |
|
| 1311 | elif case(class_literal_term_e.CharRange):
|
| 1312 | term = cast(CharRange, UP_term)
|
| 1313 | out.append(term)
|
| 1314 | return
|
| 1315 |
|
| 1316 | elif case(class_literal_term_e.PosixClass):
|
| 1317 | term = cast(PosixClass, UP_term)
|
| 1318 | out.append(term)
|
| 1319 | return
|
| 1320 |
|
| 1321 | elif case(class_literal_term_e.PerlClass):
|
| 1322 | term = cast(PerlClass, UP_term)
|
| 1323 | out.append(term)
|
| 1324 | return
|
| 1325 |
|
| 1326 | elif case(class_literal_term_e.SingleQuoted):
|
| 1327 | term = cast(SingleQuoted, UP_term)
|
| 1328 |
|
| 1329 | s = term.sval
|
| 1330 | char_code_tok = term.left
|
| 1331 |
|
| 1332 | elif case(class_literal_term_e.Splice):
|
| 1333 | term = cast(class_literal_term.Splice, UP_term)
|
| 1334 |
|
| 1335 | val = self._LookupVar(term.var_name, term.name)
|
| 1336 | s = val_ops.ToStr(val, 'Eggex char class splice expected Str',
|
| 1337 | term.name)
|
| 1338 | char_code_tok = term.name
|
| 1339 |
|
| 1340 | assert s is not None, term
|
| 1341 | for ch in s:
|
| 1342 | char_int = ord(ch)
|
| 1343 | if char_int >= 128:
|
| 1344 | # / [ '\x7f\xff' ] / is better written as / [ \x7f \xff ] /
|
| 1345 | e_die(
|
| 1346 | "Use unquoted char literal for byte %d, which is >= 128"
|
| 1347 | " (avoid confusing a set of bytes with a sequence)" %
|
| 1348 | char_int, char_code_tok)
|
| 1349 | out.append(CharCode(char_code_tok, char_int, False))
|
| 1350 |
|
| 1351 | def EvalE(self, node):
|
| 1352 | # type: (re_t) -> re_t
|
| 1353 | """Resolve references and eval constants in an Eggex
|
| 1354 |
|
| 1355 | Rules:
|
| 1356 | Splice => re_t # like Hex and @const in / Hex '.' @const /
|
| 1357 | Speck/Token (syntax) => Primitive (logical)
|
| 1358 | Chars and Strings => LiteralChars
|
| 1359 | """
|
| 1360 | UP_node = node
|
| 1361 |
|
| 1362 | with tagswitch(node) as case:
|
| 1363 | if case(re_e.Seq):
|
| 1364 | node = cast(re.Seq, UP_node)
|
| 1365 | new_children = [self.EvalE(child) for child in node.children]
|
| 1366 | return re.Seq(new_children)
|
| 1367 |
|
| 1368 | elif case(re_e.Alt):
|
| 1369 | node = cast(re.Alt, UP_node)
|
| 1370 | new_children = [self.EvalE(child) for child in node.children]
|
| 1371 | return re.Alt(new_children)
|
| 1372 |
|
| 1373 | elif case(re_e.Repeat):
|
| 1374 | node = cast(re.Repeat, UP_node)
|
| 1375 | return re.Repeat(self.EvalE(node.child), node.op)
|
| 1376 |
|
| 1377 | elif case(re_e.Group):
|
| 1378 | node = cast(re.Group, UP_node)
|
| 1379 |
|
| 1380 | # placeholder for non-capturing group
|
| 1381 | self.convert_funcs.append(None)
|
| 1382 | self.convert_toks.append(None)
|
| 1383 | return re.Group(self.EvalE(node.child))
|
| 1384 |
|
| 1385 | elif case(re_e.Capture): # Identical to Group
|
| 1386 | node = cast(re.Capture, UP_node)
|
| 1387 | convert_func = None # type: Optional[value_t]
|
| 1388 | convert_tok = None # type: Optional[Token]
|
| 1389 | if node.func_name:
|
| 1390 | func_name = lexer.LazyStr(node.func_name)
|
| 1391 | func_val = self.mem.GetValue(func_name)
|
| 1392 | with tagswitch(func_val) as case:
|
| 1393 | if case(value_e.Func, value_e.BuiltinFunc):
|
| 1394 | convert_func = func_val
|
| 1395 | convert_tok = node.func_name
|
| 1396 | else:
|
| 1397 | raise error.TypeErr(
|
| 1398 | func_val,
|
| 1399 | "Expected %r to be a func" % func_name,
|
| 1400 | node.func_name)
|
| 1401 |
|
| 1402 | self.convert_funcs.append(convert_func)
|
| 1403 | self.convert_toks.append(convert_tok)
|
| 1404 | return re.Capture(self.EvalE(node.child), node.name,
|
| 1405 | node.func_name)
|
| 1406 |
|
| 1407 | elif case(re_e.CharClassLiteral):
|
| 1408 | node = cast(re.CharClassLiteral, UP_node)
|
| 1409 |
|
| 1410 | new_terms = [] # type: List[char_class_term_t]
|
| 1411 | for t in node.terms:
|
| 1412 | # can get multiple char_class_term.CharCode for a
|
| 1413 | # class_literal_term_t
|
| 1414 | self._EvalClassLiteralTerm(t, new_terms)
|
| 1415 | return re.CharClass(node.negated, new_terms)
|
| 1416 |
|
| 1417 | elif case(re_e.SingleQuoted):
|
| 1418 | node = cast(SingleQuoted, UP_node)
|
| 1419 |
|
| 1420 | s = node.sval
|
| 1421 | return re.LiteralChars(node.left, s)
|
| 1422 |
|
| 1423 | elif case(re_e.Splice):
|
| 1424 | node = cast(re.Splice, UP_node)
|
| 1425 |
|
| 1426 | val = self._LookupVar(node.var_name, node.name)
|
| 1427 | UP_val = val
|
| 1428 | with tagswitch(val) as case:
|
| 1429 | if case(value_e.Str):
|
| 1430 | val = cast(value.Str, UP_val)
|
| 1431 | to_splice = re.LiteralChars(node.name,
|
| 1432 | val.s) # type: re_t
|
| 1433 |
|
| 1434 | elif case(value_e.Eggex):
|
| 1435 | val = cast(value.Eggex, UP_val)
|
| 1436 |
|
| 1437 | # Splicing means we get the conversion funcs too.
|
| 1438 | self.convert_funcs.extend(val.convert_funcs)
|
| 1439 | self.convert_toks.extend(val.convert_toks)
|
| 1440 |
|
| 1441 | # Splicing requires flags to match. This check is
|
| 1442 | # transitive.
|
| 1443 | to_splice = val.spliced
|
| 1444 |
|
| 1445 | if val.canonical_flags != self.canonical_flags:
|
| 1446 | e_die(
|
| 1447 | "Expected eggex flags %r, but got %r" %
|
| 1448 | (self.canonical_flags, val.canonical_flags),
|
| 1449 | node.name)
|
| 1450 |
|
| 1451 | else:
|
| 1452 | raise error.TypeErr(
|
| 1453 | val, 'Eggex splice expected Str or Eggex',
|
| 1454 | node.name)
|
| 1455 | return to_splice
|
| 1456 |
|
| 1457 | else:
|
| 1458 | # These are evaluated at translation time
|
| 1459 |
|
| 1460 | # case(re_e.Primitive)
|
| 1461 | # case(re_e.PosixClass)
|
| 1462 | # case(re_e.PerlClass)
|
| 1463 | return node
|
| 1464 |
|
| 1465 |
|
| 1466 | # vim: sw=4
|