| 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,
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| 32 | PerlClass,
|
| 33 | CharCode,
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| 34 | CharRange,
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| 35 | ArgList,
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| 36 | Eggex,
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| 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 | from core import error
|
| 50 | from core.error import e_die, e_die_status
|
| 51 | from core import num
|
| 52 | from core import pyutil
|
| 53 | from core import state
|
| 54 | from core import ui
|
| 55 | from core import vm
|
| 56 | from frontend import lexer
|
| 57 | from frontend import match
|
| 58 | from frontend import typed_args
|
| 59 | from osh import braces
|
| 60 | from mycpp import mops
|
| 61 | from mycpp.mylib import log, NewDict, switch, tagswitch, print_stderr
|
| 62 | from ysh import func_proc
|
| 63 | from ysh import val_ops
|
| 64 |
|
| 65 | import libc
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| 66 |
|
| 67 | from typing import cast, Optional, Dict, List, Tuple, TYPE_CHECKING
|
| 68 |
|
| 69 | if TYPE_CHECKING:
|
| 70 | from osh import cmd_eval
|
| 71 | from osh import word_eval
|
| 72 | from osh import split
|
| 73 |
|
| 74 | _ = log
|
| 75 |
|
| 76 |
|
| 77 | def LookupVar(mem, var_name, which_scopes, var_loc):
|
| 78 | # type: (state.Mem, str, scope_t, loc_t) -> value_t
|
| 79 |
|
| 80 | # Lookup WITHOUT dynamic scope.
|
| 81 | val = mem.GetValue(var_name, which_scopes=which_scopes)
|
| 82 | if val.tag() == value_e.Undef:
|
| 83 | e_die('Undefined variable %r' % var_name, var_loc)
|
| 84 |
|
| 85 | return val
|
| 86 |
|
| 87 |
|
| 88 | def _ConvertToInt(val, msg, blame_loc):
|
| 89 | # type: (value_t, str, loc_t) -> mops.BigInt
|
| 90 | UP_val = val
|
| 91 | with tagswitch(val) as case:
|
| 92 | if case(value_e.Int):
|
| 93 | val = cast(value.Int, UP_val)
|
| 94 | return val.i
|
| 95 |
|
| 96 | elif case(value_e.Str):
|
| 97 | val = cast(value.Str, UP_val)
|
| 98 | if match.LooksLikeInteger(val.s):
|
| 99 | # TODO: Handle ValueError
|
| 100 | return mops.FromStr(val.s)
|
| 101 |
|
| 102 | raise error.TypeErr(val, msg, blame_loc)
|
| 103 |
|
| 104 |
|
| 105 | def _ConvertToNumber(val):
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| 106 | # type: (value_t) -> Tuple[coerced_t, mops.BigInt, float]
|
| 107 | UP_val = val
|
| 108 | with tagswitch(val) as case:
|
| 109 | if case(value_e.Int):
|
| 110 | val = cast(value.Int, UP_val)
|
| 111 | return coerced_e.Int, val.i, -1.0
|
| 112 |
|
| 113 | elif case(value_e.Float):
|
| 114 | val = cast(value.Float, UP_val)
|
| 115 | return coerced_e.Float, mops.MINUS_ONE, val.f
|
| 116 |
|
| 117 | elif case(value_e.Str):
|
| 118 | val = cast(value.Str, UP_val)
|
| 119 | if match.LooksLikeInteger(val.s):
|
| 120 | # TODO: Handle ValueError
|
| 121 | return coerced_e.Int, mops.FromStr(val.s), -1.0
|
| 122 |
|
| 123 | if match.LooksLikeFloat(val.s):
|
| 124 | return coerced_e.Float, mops.MINUS_ONE, float(val.s)
|
| 125 |
|
| 126 | return coerced_e.Neither, mops.MINUS_ONE, -1.0
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| 127 |
|
| 128 |
|
| 129 | def _ConvertForBinaryOp(left, right):
|
| 130 | # type: (value_t, value_t) -> Tuple[coerced_t, mops.BigInt, mops.BigInt, float, float]
|
| 131 | """
|
| 132 | Returns one of
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| 133 | value_e.Int or value_e.Float
|
| 134 | 2 ints or 2 floats
|
| 135 |
|
| 136 | To indicate which values the operation should be done on
|
| 137 | """
|
| 138 | c1, i1, f1 = _ConvertToNumber(left)
|
| 139 | c2, i2, f2 = _ConvertToNumber(right)
|
| 140 |
|
| 141 | nope = mops.MINUS_ONE
|
| 142 |
|
| 143 | if c1 == coerced_e.Int and c2 == coerced_e.Int:
|
| 144 | return coerced_e.Int, i1, i2, -1.0, -1.0
|
| 145 |
|
| 146 | elif c1 == coerced_e.Int and c2 == coerced_e.Float:
|
| 147 | return coerced_e.Float, nope, nope, mops.ToFloat(i1), f2
|
| 148 |
|
| 149 | elif c1 == coerced_e.Float and c2 == coerced_e.Int:
|
| 150 | return coerced_e.Float, nope, nope, f1, mops.ToFloat(i2)
|
| 151 |
|
| 152 | elif c1 == coerced_e.Float and c2 == coerced_e.Float:
|
| 153 | return coerced_e.Float, nope, nope, f1, f2
|
| 154 |
|
| 155 | else:
|
| 156 | # No operation is valid
|
| 157 | return coerced_e.Neither, nope, nope, -1.0, -1.0
|
| 158 |
|
| 159 |
|
| 160 | class ExprEvaluator(object):
|
| 161 | """Shared between arith and bool evaluators.
|
| 162 |
|
| 163 | They both:
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| 164 |
|
| 165 | 1. Convert strings to integers, respecting shopt -s strict_arith.
|
| 166 | 2. Look up variables and evaluate words.
|
| 167 | """
|
| 168 |
|
| 169 | def __init__(
|
| 170 | self,
|
| 171 | mem, # type: state.Mem
|
| 172 | mutable_opts, # type: state.MutableOpts
|
| 173 | methods, # type: Dict[int, Dict[str, vm._Callable]]
|
| 174 | splitter, # type: split.SplitContext
|
| 175 | errfmt, # type: ui.ErrorFormatter
|
| 176 | ):
|
| 177 | # type: (...) -> None
|
| 178 | self.shell_ex = None # type: vm._Executor
|
| 179 | self.cmd_ev = None # type: cmd_eval.CommandEvaluator
|
| 180 | self.word_ev = None # type: word_eval.AbstractWordEvaluator
|
| 181 |
|
| 182 | self.mem = mem
|
| 183 | self.mutable_opts = mutable_opts
|
| 184 | self.methods = methods
|
| 185 | self.splitter = splitter
|
| 186 | self.errfmt = errfmt
|
| 187 |
|
| 188 | def CheckCircularDeps(self):
|
| 189 | # type: () -> None
|
| 190 | assert self.shell_ex is not None
|
| 191 | assert self.word_ev is not None
|
| 192 |
|
| 193 | def _LookupVar(self, name, var_loc):
|
| 194 | # type: (str, loc_t) -> value_t
|
| 195 | return LookupVar(self.mem, name, scope_e.LocalOrGlobal, var_loc)
|
| 196 |
|
| 197 | def EvalAugmented(self, lval, rhs_val, op, which_scopes):
|
| 198 | # type: (y_lvalue_t, value_t, Token, scope_t) -> None
|
| 199 | """ setvar x +=1, setvar L[0] -= 1
|
| 200 |
|
| 201 | Called by CommandEvaluator
|
| 202 | """
|
| 203 | # TODO: It might be nice to do auto d[x] += 1 too
|
| 204 |
|
| 205 | UP_lval = lval
|
| 206 | with tagswitch(lval) as case:
|
| 207 | if case(y_lvalue_e.Local): # setvar x += 1
|
| 208 | lval = cast(LeftName, UP_lval)
|
| 209 | lhs_val = self._LookupVar(lval.name, lval.blame_loc)
|
| 210 | if op.id in (Id.Arith_PlusEqual, Id.Arith_MinusEqual,
|
| 211 | Id.Arith_StarEqual, Id.Arith_SlashEqual):
|
| 212 | new_val = self._ArithIntFloat(lhs_val, rhs_val, op)
|
| 213 | else:
|
| 214 | new_val = self._ArithIntOnly(lhs_val, rhs_val, op)
|
| 215 |
|
| 216 | self.mem.SetNamed(lval, new_val, which_scopes)
|
| 217 |
|
| 218 | elif case(y_lvalue_e.Container): # setvar d.key += 1
|
| 219 | lval = cast(y_lvalue.Container, UP_lval)
|
| 220 |
|
| 221 | obj = lval.obj
|
| 222 | UP_obj = obj
|
| 223 |
|
| 224 | lhs_val_ = None # type: value_t
|
| 225 | # Similar to command_e.Mutation
|
| 226 | with tagswitch(obj) as case:
|
| 227 | if case(value_e.List):
|
| 228 | obj = cast(value.List, UP_obj)
|
| 229 | index = val_ops.ToInt(lval.index,
|
| 230 | 'List index should be Int',
|
| 231 | loc.Missing)
|
| 232 | lhs_val_ = obj.items[index]
|
| 233 |
|
| 234 | elif case(value_e.Dict):
|
| 235 | obj = cast(value.Dict, UP_obj)
|
| 236 | index = -1 # silence C++ warning
|
| 237 | key = val_ops.ToStr(lval.index,
|
| 238 | 'Dict index should be Str',
|
| 239 | loc.Missing)
|
| 240 | lhs_val_ = obj.d[key]
|
| 241 |
|
| 242 | else:
|
| 243 | raise error.TypeErr(
|
| 244 | obj, "obj[index] expected List or Dict",
|
| 245 | loc.Missing)
|
| 246 |
|
| 247 | if op.id in (Id.Arith_PlusEqual, Id.Arith_MinusEqual,
|
| 248 | Id.Arith_StarEqual, Id.Arith_SlashEqual):
|
| 249 | new_val_ = self._ArithIntFloat(lhs_val_, rhs_val, op)
|
| 250 | else:
|
| 251 | new_val_ = self._ArithIntOnly(lhs_val_, rhs_val, op)
|
| 252 |
|
| 253 | with tagswitch(obj) as case:
|
| 254 | if case(value_e.List):
|
| 255 | obj = cast(value.List, UP_obj)
|
| 256 | assert index != -1, 'Should have been initialized'
|
| 257 | obj.items[index] = new_val_
|
| 258 |
|
| 259 | elif case(value_e.Dict):
|
| 260 | obj = cast(value.Dict, UP_obj)
|
| 261 | obj.d[key] = new_val_
|
| 262 |
|
| 263 | else:
|
| 264 | raise AssertionError()
|
| 265 |
|
| 266 | def _EvalLhsExpr(self, lhs):
|
| 267 | # type: (y_lhs_t) -> y_lvalue_t
|
| 268 |
|
| 269 | UP_lhs = lhs
|
| 270 | with tagswitch(lhs) as case:
|
| 271 | if case(y_lhs_e.Var):
|
| 272 | lhs = cast(Token, UP_lhs)
|
| 273 | return LeftName(lexer.LazyStr(lhs), lhs)
|
| 274 |
|
| 275 | elif case(y_lhs_e.Subscript):
|
| 276 | lhs = cast(Subscript, UP_lhs)
|
| 277 | # setvar mylist[0] = 42
|
| 278 | # setvar mydict['key'] = 42
|
| 279 |
|
| 280 | lval = self._EvalExpr(lhs.obj)
|
| 281 | index = self._EvalExpr(lhs.index)
|
| 282 | #log('index %s', index)
|
| 283 | return y_lvalue.Container(lval, index)
|
| 284 |
|
| 285 | elif case(y_lhs_e.Attribute):
|
| 286 | lhs = cast(Attribute, UP_lhs)
|
| 287 | assert lhs.op.id == Id.Expr_Dot
|
| 288 |
|
| 289 | # setvar mydict.key = 42
|
| 290 | lval = self._EvalExpr(lhs.obj)
|
| 291 |
|
| 292 | attr = value.Str(lhs.attr_name)
|
| 293 | return y_lvalue.Container(lval, attr)
|
| 294 |
|
| 295 | else:
|
| 296 | raise AssertionError()
|
| 297 |
|
| 298 | def EvalExpr(self, node, blame_loc):
|
| 299 | # type: (expr_t, loc_t) -> value_t
|
| 300 | """Public API for _EvalExpr to ensure command_sub_errexit"""
|
| 301 | self.mem.SetLocationForExpr(blame_loc)
|
| 302 | # Pure C++ won't need to catch exceptions
|
| 303 | with state.ctx_YshExpr(self.mutable_opts):
|
| 304 | val = self._EvalExpr(node)
|
| 305 | return val
|
| 306 |
|
| 307 | def EvalLhsExpr(self, lhs):
|
| 308 | # type: (y_lhs_t) -> y_lvalue_t
|
| 309 | """Public API for _EvalLhsExpr to ensure command_sub_errexit"""
|
| 310 | with state.ctx_YshExpr(self.mutable_opts):
|
| 311 | lval = self._EvalLhsExpr(lhs)
|
| 312 | return lval
|
| 313 |
|
| 314 | def EvalExprSub(self, part):
|
| 315 | # type: (word_part.ExprSub) -> part_value_t
|
| 316 |
|
| 317 | val = self.EvalExpr(part.child, part.left)
|
| 318 |
|
| 319 | with switch(part.left.id) as case:
|
| 320 | if case(Id.Left_DollarBracket): # $[join(x)]
|
| 321 | s = val_ops.Stringify(val, loc.WordPart(part))
|
| 322 | return Piece(s, False, False)
|
| 323 |
|
| 324 | elif case(Id.Lit_AtLBracket): # @[split(x)]
|
| 325 | strs = val_ops.ToShellArray(val,
|
| 326 | loc.WordPart(part),
|
| 327 | prefix='Expr splice ')
|
| 328 | return part_value.Array(strs)
|
| 329 |
|
| 330 | else:
|
| 331 | raise AssertionError(part.left)
|
| 332 |
|
| 333 | def PluginCall(self, func_val, pos_args):
|
| 334 | # type: (value.Func, List[value_t]) -> value_t
|
| 335 | """For renderPrompt()
|
| 336 |
|
| 337 | Similar to
|
| 338 | - WordEvaluator.EvalForPlugin(), which evaluates $PS1 outside main loop
|
| 339 | - ReadlineCallback.__call__, which executes shell outside main loop
|
| 340 | """
|
| 341 | with state.ctx_YshExpr(self.mutable_opts):
|
| 342 | with state.ctx_Registers(self.mem): # to sandbox globals
|
| 343 | named_args = {} # type: Dict[str, value_t]
|
| 344 | arg_list = ArgList.CreateNull() # There's no call site
|
| 345 | rd = typed_args.Reader(pos_args, named_args, arg_list)
|
| 346 |
|
| 347 | try:
|
| 348 | val = func_proc.CallUserFunc(func_val, rd, self.mem,
|
| 349 | self.cmd_ev)
|
| 350 | except error.FatalRuntime as e:
|
| 351 | val = value.Str('<Runtime error: %s>' %
|
| 352 | e.UserErrorString())
|
| 353 |
|
| 354 | except (IOError, OSError) as e:
|
| 355 | val = value.Str('<I/O error: %s>' % pyutil.strerror(e))
|
| 356 |
|
| 357 | except KeyboardInterrupt:
|
| 358 | val = value.Str('<Ctrl-C>')
|
| 359 |
|
| 360 | return val
|
| 361 |
|
| 362 | def CallConvertFunc(self, func_val, arg, convert_tok, call_loc):
|
| 363 | # type: (value_t, value_t, Token, loc_t) -> value_t
|
| 364 | """ For Eggex captures """
|
| 365 | with state.ctx_YshExpr(self.mutable_opts):
|
| 366 | pos_args = [arg]
|
| 367 | named_args = {} # type: Dict[str, value_t]
|
| 368 | arg_list = ArgList.CreateNull() # There's no call site
|
| 369 | rd = typed_args.Reader(pos_args, named_args, arg_list)
|
| 370 | rd.SetFallbackLocation(convert_tok)
|
| 371 | try:
|
| 372 | val = self._CallFunc(func_val, rd)
|
| 373 | except error.FatalRuntime as e:
|
| 374 | func_name = lexer.TokenVal(convert_tok)
|
| 375 | self.errfmt.Print_(
|
| 376 | 'Fatal error calling Eggex conversion func %r from this Match accessor'
|
| 377 | % func_name, call_loc)
|
| 378 | print_stderr('')
|
| 379 | raise
|
| 380 |
|
| 381 | return val
|
| 382 |
|
| 383 | def SpliceValue(self, val, part):
|
| 384 | # type: (value_t, word_part.Splice) -> List[str]
|
| 385 | """ write -- @myvar """
|
| 386 | return val_ops.ToShellArray(val, loc.WordPart(part), prefix='Splice ')
|
| 387 |
|
| 388 | def _EvalConst(self, node):
|
| 389 | # type: (expr.Const) -> value_t
|
| 390 | return node.val
|
| 391 |
|
| 392 | def _EvalUnary(self, node):
|
| 393 | # type: (expr.Unary) -> value_t
|
| 394 |
|
| 395 | val = self._EvalExpr(node.child)
|
| 396 |
|
| 397 | with switch(node.op.id) as case:
|
| 398 | if case(Id.Arith_Minus):
|
| 399 | c1, i1, f1 = _ConvertToNumber(val)
|
| 400 | if c1 == coerced_e.Int:
|
| 401 | return value.Int(mops.Negate(i1))
|
| 402 | if c1 == coerced_e.Float:
|
| 403 | return value.Float(-f1)
|
| 404 | raise error.TypeErr(val, 'Negation expected Int or Float',
|
| 405 | node.op)
|
| 406 |
|
| 407 | elif case(Id.Arith_Tilde):
|
| 408 | i = _ConvertToInt(val, '~ expected Int', node.op)
|
| 409 | return value.Int(mops.BitNot(i))
|
| 410 |
|
| 411 | elif case(Id.Expr_Not):
|
| 412 | b = val_ops.ToBool(val)
|
| 413 | return value.Bool(False if b else True)
|
| 414 |
|
| 415 | # &s &a[0] &d.key &d.nested.other
|
| 416 | elif case(Id.Arith_Amp):
|
| 417 | # Only 3 possibilities:
|
| 418 | # - expr.Var
|
| 419 | # - expr.Attribute with `.` operator (d.key)
|
| 420 | # - expr.SubScript
|
| 421 | #
|
| 422 | # See _EvalLhsExpr, which gives you y_lvalue
|
| 423 |
|
| 424 | # TODO: &x, &a[0], &d.key, creates a value.Place?
|
| 425 | # If it's Attribute or SubScript, you don't evaluate them.
|
| 426 | # y_lvalue_t -> place_t
|
| 427 |
|
| 428 | raise NotImplementedError(node.op)
|
| 429 |
|
| 430 | else:
|
| 431 | raise AssertionError(node.op)
|
| 432 |
|
| 433 | raise AssertionError('for C++ compiler')
|
| 434 |
|
| 435 | def _ArithIntFloat(self, left, right, op):
|
| 436 | # type: (value_t, value_t, Token) -> value_t
|
| 437 | """
|
| 438 | Note: may be replaced with arithmetic on tagged integers, e.g. 60 bit
|
| 439 | with overflow detection
|
| 440 | """
|
| 441 | c, i1, i2, f1, f2 = _ConvertForBinaryOp(left, right)
|
| 442 |
|
| 443 | op_id = op.id
|
| 444 |
|
| 445 | if c == coerced_e.Int:
|
| 446 | with switch(op_id) as case:
|
| 447 | if case(Id.Arith_Plus, Id.Arith_PlusEqual):
|
| 448 | return value.Int(mops.Add(i1, i2))
|
| 449 | elif case(Id.Arith_Minus, Id.Arith_MinusEqual):
|
| 450 | return value.Int(mops.Sub(i1, i2))
|
| 451 | elif case(Id.Arith_Star, Id.Arith_StarEqual):
|
| 452 | return value.Int(mops.Mul(i1, i2))
|
| 453 | elif case(Id.Arith_Slash, Id.Arith_SlashEqual):
|
| 454 | if mops.Equal(i2, mops.ZERO):
|
| 455 | raise error.Expr('Divide by zero', op)
|
| 456 | return value.Float(mops.ToFloat(i1) / mops.ToFloat(i2))
|
| 457 | else:
|
| 458 | raise AssertionError()
|
| 459 |
|
| 460 | elif c == coerced_e.Float:
|
| 461 | with switch(op_id) as case:
|
| 462 | if case(Id.Arith_Plus, Id.Arith_PlusEqual):
|
| 463 | return value.Float(f1 + f2)
|
| 464 | elif case(Id.Arith_Minus, Id.Arith_MinusEqual):
|
| 465 | return value.Float(f1 - f2)
|
| 466 | elif case(Id.Arith_Star, Id.Arith_StarEqual):
|
| 467 | return value.Float(f1 * f2)
|
| 468 | elif case(Id.Arith_Slash, Id.Arith_SlashEqual):
|
| 469 | if f2 == 0.0:
|
| 470 | raise error.Expr('Divide by zero', op)
|
| 471 | return value.Float(f1 / f2)
|
| 472 | else:
|
| 473 | raise AssertionError()
|
| 474 |
|
| 475 | else:
|
| 476 | raise error.TypeErrVerbose(
|
| 477 | 'Binary operator expected numbers, got %s and %s' %
|
| 478 | (ui.ValType(left), ui.ValType(right)), op)
|
| 479 |
|
| 480 | def _ArithIntOnly(self, left, right, op):
|
| 481 | # type: (value_t, value_t, Token) -> value_t
|
| 482 |
|
| 483 | i1 = _ConvertToInt(left, 'Left operand should be Int', op)
|
| 484 | i2 = _ConvertToInt(right, 'Right operand should be Int', op)
|
| 485 |
|
| 486 | with switch(op.id) as case:
|
| 487 |
|
| 488 | # a % b setvar a %= b
|
| 489 | if case(Id.Arith_Percent, Id.Arith_PercentEqual):
|
| 490 | if mops.Equal(i2, mops.ZERO):
|
| 491 | raise error.Expr('Divide by zero', op)
|
| 492 | if mops.Greater(mops.ZERO, i2):
|
| 493 | # Disallow this to remove confusion between modulus and remainder
|
| 494 | raise error.Expr("Divisor can't be negative", op)
|
| 495 |
|
| 496 | return value.Int(num.IntRemainder(i1, i2))
|
| 497 |
|
| 498 | # a // b setvar a //= b
|
| 499 | elif case(Id.Expr_DSlash, Id.Expr_DSlashEqual):
|
| 500 | if mops.Equal(i2, mops.ZERO):
|
| 501 | raise error.Expr('Divide by zero', op)
|
| 502 | return value.Int(num.IntDivide(i1, i2))
|
| 503 |
|
| 504 | # a ** b setvar a **= b (ysh only)
|
| 505 | elif case(Id.Arith_DStar, Id.Expr_DStarEqual):
|
| 506 | # Same as sh_expr_eval.py
|
| 507 | if mops.Greater(mops.ZERO, i2):
|
| 508 | raise error.Expr("Exponent can't be a negative number", op)
|
| 509 | return value.Int(num.Exponent(i1, i2))
|
| 510 |
|
| 511 | # Bitwise
|
| 512 | elif case(Id.Arith_Amp, Id.Arith_AmpEqual): # &
|
| 513 | return value.Int(mops.BitAnd(i1, i2))
|
| 514 |
|
| 515 | elif case(Id.Arith_Pipe, Id.Arith_PipeEqual): # |
|
| 516 | return value.Int(mops.BitOr(i1, i2))
|
| 517 |
|
| 518 | elif case(Id.Arith_Caret, Id.Arith_CaretEqual): # ^
|
| 519 | return value.Int(mops.BitXor(i1, i2))
|
| 520 |
|
| 521 | elif case(Id.Arith_DGreat, Id.Arith_DGreatEqual): # >>
|
| 522 | return value.Int(mops.RShift(i1, i2))
|
| 523 |
|
| 524 | elif case(Id.Arith_DLess, Id.Arith_DLessEqual): # <<
|
| 525 | return value.Int(mops.LShift(i1, i2))
|
| 526 |
|
| 527 | else:
|
| 528 | raise AssertionError(op.id)
|
| 529 |
|
| 530 | def _Concat(self, left, right, op):
|
| 531 | # type: (value_t, value_t, Token) -> value_t
|
| 532 | UP_left = left
|
| 533 | UP_right = right
|
| 534 |
|
| 535 | if left.tag() == value_e.Str and right.tag() == value_e.Str:
|
| 536 | left = cast(value.Str, UP_left)
|
| 537 | right = cast(value.Str, UP_right)
|
| 538 |
|
| 539 | return value.Str(left.s + right.s)
|
| 540 |
|
| 541 | elif left.tag() == value_e.List and right.tag() == value_e.List:
|
| 542 | left = cast(value.List, UP_left)
|
| 543 | right = cast(value.List, UP_right)
|
| 544 |
|
| 545 | c = list(left.items) # mycpp rewrite of L1 + L2
|
| 546 | c.extend(right.items)
|
| 547 | return value.List(c)
|
| 548 |
|
| 549 | else:
|
| 550 | raise error.TypeErrVerbose(
|
| 551 | 'Expected Str ++ Str or List ++ List, got %s ++ %s' %
|
| 552 | (ui.ValType(left), ui.ValType(right)), op)
|
| 553 |
|
| 554 | def _EvalBinary(self, node):
|
| 555 | # type: (expr.Binary) -> value_t
|
| 556 |
|
| 557 | left = self._EvalExpr(node.left)
|
| 558 |
|
| 559 | # Logical and/or lazily evaluate
|
| 560 | with switch(node.op.id) as case:
|
| 561 | if case(Id.Expr_And):
|
| 562 | if val_ops.ToBool(left): # no errors
|
| 563 | return self._EvalExpr(node.right)
|
| 564 | else:
|
| 565 | return left
|
| 566 |
|
| 567 | elif case(Id.Expr_Or):
|
| 568 | if val_ops.ToBool(left):
|
| 569 | return left
|
| 570 | else:
|
| 571 | return self._EvalExpr(node.right)
|
| 572 |
|
| 573 | # These operators all eagerly evaluate
|
| 574 | right = self._EvalExpr(node.right)
|
| 575 |
|
| 576 | with switch(node.op.id) as case:
|
| 577 | if case(Id.Arith_DPlus): # a ++ b to concat Str or List
|
| 578 | return self._Concat(left, right, node.op)
|
| 579 |
|
| 580 | elif case(Id.Arith_Plus, Id.Arith_Minus, Id.Arith_Star,
|
| 581 | Id.Arith_Slash):
|
| 582 | return self._ArithIntFloat(left, right, node.op)
|
| 583 |
|
| 584 | else:
|
| 585 | return self._ArithIntOnly(left, right, node.op)
|
| 586 |
|
| 587 | def _CompareNumeric(self, left, right, op):
|
| 588 | # type: (value_t, value_t, Token) -> bool
|
| 589 | c, i1, i2, f1, f2 = _ConvertForBinaryOp(left, right)
|
| 590 |
|
| 591 | if c == coerced_e.Int:
|
| 592 | with switch(op.id) as case:
|
| 593 | if case(Id.Arith_Less):
|
| 594 | return mops.Greater(i2, i1)
|
| 595 | elif case(Id.Arith_Great):
|
| 596 | return mops.Greater(i1, i2)
|
| 597 | elif case(Id.Arith_LessEqual):
|
| 598 | return mops.Greater(i2, i1) or mops.Equal(i1, i2)
|
| 599 | elif case(Id.Arith_GreatEqual):
|
| 600 | return mops.Greater(i1, i2) or mops.Equal(i1, i2)
|
| 601 | else:
|
| 602 | raise AssertionError()
|
| 603 |
|
| 604 | elif c == coerced_e.Float:
|
| 605 | with switch(op.id) as case:
|
| 606 | if case(Id.Arith_Less):
|
| 607 | return f1 < f2
|
| 608 | elif case(Id.Arith_Great):
|
| 609 | return f1 > f2
|
| 610 | elif case(Id.Arith_LessEqual):
|
| 611 | return f1 <= f2
|
| 612 | elif case(Id.Arith_GreatEqual):
|
| 613 | return f1 >= f2
|
| 614 | else:
|
| 615 | raise AssertionError()
|
| 616 |
|
| 617 | else:
|
| 618 | raise error.TypeErrVerbose(
|
| 619 | 'Comparison operator expected numbers, got %s and %s' %
|
| 620 | (ui.ValType(left), ui.ValType(right)), op)
|
| 621 |
|
| 622 | def _EvalCompare(self, node):
|
| 623 | # type: (expr.Compare) -> value_t
|
| 624 |
|
| 625 | left = self._EvalExpr(node.left)
|
| 626 | result = True # Implicit and
|
| 627 | for i, op in enumerate(node.ops):
|
| 628 | right_expr = node.comparators[i]
|
| 629 |
|
| 630 | right = self._EvalExpr(right_expr)
|
| 631 |
|
| 632 | if op.id in (Id.Arith_Less, Id.Arith_Great, Id.Arith_LessEqual,
|
| 633 | Id.Arith_GreatEqual):
|
| 634 | result = self._CompareNumeric(left, right, op)
|
| 635 |
|
| 636 | elif op.id == Id.Expr_TEqual:
|
| 637 | if left.tag() != right.tag():
|
| 638 | result = False
|
| 639 | else:
|
| 640 | result = val_ops.ExactlyEqual(left, right, op)
|
| 641 | elif op.id == Id.Expr_NotDEqual:
|
| 642 | if left.tag() != right.tag():
|
| 643 | result = True
|
| 644 | else:
|
| 645 | result = not val_ops.ExactlyEqual(left, right, op)
|
| 646 |
|
| 647 | elif op.id == Id.Expr_In:
|
| 648 | result = val_ops.Contains(left, right)
|
| 649 | elif op.id == Id.Node_NotIn:
|
| 650 | result = not val_ops.Contains(left, right)
|
| 651 |
|
| 652 | elif op.id == Id.Expr_Is:
|
| 653 | if left.tag() != right.tag():
|
| 654 | raise error.TypeErrVerbose('Mismatched types', op)
|
| 655 | result = left is right
|
| 656 |
|
| 657 | elif op.id == Id.Node_IsNot:
|
| 658 | if left.tag() != right.tag():
|
| 659 | raise error.TypeErrVerbose('Mismatched types', op)
|
| 660 | result = left is not right
|
| 661 |
|
| 662 | elif op.id == Id.Expr_DTilde:
|
| 663 | # no extglob in Oil language; use eggex
|
| 664 | if left.tag() != value_e.Str:
|
| 665 | raise error.TypeErrVerbose('LHS must be Str', op)
|
| 666 |
|
| 667 | if right.tag() != value_e.Str:
|
| 668 | raise error.TypeErrVerbose('RHS must be Str', op)
|
| 669 |
|
| 670 | UP_left = left
|
| 671 | UP_right = right
|
| 672 | left = cast(value.Str, UP_left)
|
| 673 | right = cast(value.Str, UP_right)
|
| 674 | return value.Bool(libc.fnmatch(right.s, left.s))
|
| 675 |
|
| 676 | elif op.id == Id.Expr_NotDTilde:
|
| 677 | if left.tag() != value_e.Str:
|
| 678 | raise error.TypeErrVerbose('LHS must be Str', op)
|
| 679 |
|
| 680 | if right.tag() != value_e.Str:
|
| 681 | raise error.TypeErrVerbose('RHS must be Str', op)
|
| 682 |
|
| 683 | UP_left = left
|
| 684 | UP_right = right
|
| 685 | left = cast(value.Str, UP_left)
|
| 686 | right = cast(value.Str, UP_right)
|
| 687 | return value.Bool(not libc.fnmatch(right.s, left.s))
|
| 688 |
|
| 689 | elif op.id == Id.Expr_TildeDEqual:
|
| 690 | # Approximate equality
|
| 691 | UP_left = left
|
| 692 | if left.tag() != value_e.Str:
|
| 693 | e_die('~== expects a string on the left', op)
|
| 694 |
|
| 695 | left = cast(value.Str, UP_left)
|
| 696 | left2 = left.s.strip()
|
| 697 |
|
| 698 | UP_right = right
|
| 699 | with tagswitch(right) as case:
|
| 700 | if case(value_e.Str):
|
| 701 | right = cast(value.Str, UP_right)
|
| 702 | return value.Bool(left2 == right.s)
|
| 703 |
|
| 704 | elif case(value_e.Bool):
|
| 705 | right = cast(value.Bool, UP_right)
|
| 706 | left2 = left2.lower()
|
| 707 | lb = False
|
| 708 | if left2 == 'true':
|
| 709 | lb = True
|
| 710 | elif left2 == 'false':
|
| 711 | lb = False
|
| 712 | else:
|
| 713 | return value.Bool(False)
|
| 714 |
|
| 715 | #log('left %r left2 %r', left, left2)
|
| 716 | return value.Bool(lb == right.b)
|
| 717 |
|
| 718 | elif case(value_e.Int):
|
| 719 | right = cast(value.Int, UP_right)
|
| 720 | if not left2.isdigit():
|
| 721 | return value.Bool(False)
|
| 722 |
|
| 723 | eq = mops.Equal(mops.FromStr(left2), right.i)
|
| 724 | return value.Bool(eq)
|
| 725 |
|
| 726 | e_die('~== expects Str, Int, or Bool on the right', op)
|
| 727 |
|
| 728 | else:
|
| 729 | try:
|
| 730 | if op.id == Id.Arith_Tilde:
|
| 731 | result = val_ops.MatchRegex(left, right, self.mem)
|
| 732 |
|
| 733 | elif op.id == Id.Expr_NotTilde:
|
| 734 | # don't pass self.mem to not set a match
|
| 735 | result = not val_ops.MatchRegex(left, right, None)
|
| 736 |
|
| 737 | else:
|
| 738 | raise AssertionError(op)
|
| 739 | except ValueError as e:
|
| 740 | # Status 2 indicates a regex parse error, as with [[ in OSH
|
| 741 | e_die_status(2, e.message, op)
|
| 742 |
|
| 743 | if not result:
|
| 744 | return value.Bool(result)
|
| 745 |
|
| 746 | left = right
|
| 747 |
|
| 748 | return value.Bool(result)
|
| 749 |
|
| 750 | def _CallFunc(self, to_call, rd):
|
| 751 | # type: (value_t, typed_args.Reader) -> value_t
|
| 752 |
|
| 753 | # Now apply args to either builtin or user-defined function
|
| 754 | UP_to_call = to_call
|
| 755 | with tagswitch(to_call) as case:
|
| 756 | if case(value_e.Func):
|
| 757 | to_call = cast(value.Func, UP_to_call)
|
| 758 |
|
| 759 | return func_proc.CallUserFunc(to_call, rd, self.mem,
|
| 760 | self.cmd_ev)
|
| 761 |
|
| 762 | elif case(value_e.BuiltinFunc):
|
| 763 | to_call = cast(value.BuiltinFunc, UP_to_call)
|
| 764 |
|
| 765 | # C++ cast to work around ASDL 'any'
|
| 766 | f = cast(vm._Callable, to_call.callable)
|
| 767 | return f.Call(rd)
|
| 768 | else:
|
| 769 | raise AssertionError("Shouldn't have been bound")
|
| 770 |
|
| 771 | def _EvalFuncCall(self, node):
|
| 772 | # type: (expr.FuncCall) -> value_t
|
| 773 |
|
| 774 | func = self._EvalExpr(node.func)
|
| 775 | UP_func = func
|
| 776 |
|
| 777 | # The () operator has a 2x2 matrix of
|
| 778 | # (free, bound) x (builtin, user-defined)
|
| 779 |
|
| 780 | # Eval args first
|
| 781 | with tagswitch(func) as case:
|
| 782 | if case(value_e.Func, value_e.BuiltinFunc):
|
| 783 | to_call = func
|
| 784 | pos_args, named_args = func_proc._EvalArgList(self, node.args)
|
| 785 | rd = typed_args.Reader(pos_args, named_args, node.args)
|
| 786 |
|
| 787 | elif case(value_e.BoundFunc):
|
| 788 | func = cast(value.BoundFunc, UP_func)
|
| 789 |
|
| 790 | to_call = func.func
|
| 791 | pos_args, named_args = func_proc._EvalArgList(self,
|
| 792 | node.args,
|
| 793 | me=func.me)
|
| 794 | rd = typed_args.Reader(pos_args,
|
| 795 | named_args,
|
| 796 | node.args,
|
| 797 | is_bound=True)
|
| 798 | else:
|
| 799 | raise error.TypeErr(func, 'Expected a function or method',
|
| 800 | node.args.left)
|
| 801 |
|
| 802 | return self._CallFunc(to_call, rd)
|
| 803 |
|
| 804 | def _EvalSubscript(self, node):
|
| 805 | # type: (Subscript) -> value_t
|
| 806 |
|
| 807 | obj = self._EvalExpr(node.obj)
|
| 808 | index = self._EvalExpr(node.index)
|
| 809 |
|
| 810 | UP_obj = obj
|
| 811 | UP_index = index
|
| 812 |
|
| 813 | with tagswitch(obj) as case:
|
| 814 | if case(value_e.Str):
|
| 815 | # Note: s[i] and s[i:j] are like Go, on bytes. We may provide
|
| 816 | # s->numBytes(), s->countRunes(), and iteration over runes.
|
| 817 | obj = cast(value.Str, UP_obj)
|
| 818 | with tagswitch(index) as case2:
|
| 819 | if case2(value_e.Slice):
|
| 820 | index = cast(value.Slice, UP_index)
|
| 821 |
|
| 822 | lower = index.lower.i if index.lower else 0
|
| 823 | upper = index.upper.i if index.upper else len(obj.s)
|
| 824 | return value.Str(obj.s[lower:upper])
|
| 825 |
|
| 826 | elif case2(value_e.Int):
|
| 827 | index = cast(value.Int, UP_index)
|
| 828 | i = mops.BigTruncate(index.i)
|
| 829 | try:
|
| 830 | return value.Str(obj.s[i])
|
| 831 | except IndexError:
|
| 832 | # TODO: expr.Subscript has no error location
|
| 833 | raise error.Expr('index out of range', loc.Missing)
|
| 834 |
|
| 835 | else:
|
| 836 | raise error.TypeErr(index,
|
| 837 | 'Str index expected Int or Slice',
|
| 838 | loc.Missing)
|
| 839 |
|
| 840 | elif case(value_e.List):
|
| 841 | obj = cast(value.List, UP_obj)
|
| 842 | with tagswitch(index) as case2:
|
| 843 | if case2(value_e.Slice):
|
| 844 | index = cast(value.Slice, UP_index)
|
| 845 |
|
| 846 | lower = index.lower.i if index.lower else 0
|
| 847 | upper = index.upper.i if index.upper else len(
|
| 848 | obj.items)
|
| 849 | return value.List(obj.items[lower:upper])
|
| 850 |
|
| 851 | elif case2(value_e.Int):
|
| 852 | index = cast(value.Int, UP_index)
|
| 853 | i = mops.BigTruncate(index.i)
|
| 854 | try:
|
| 855 | return obj.items[i]
|
| 856 | except IndexError:
|
| 857 | # TODO: expr.Subscript has no error location
|
| 858 | raise error.Expr('index out of range', loc.Missing)
|
| 859 |
|
| 860 | else:
|
| 861 | raise error.TypeErr(
|
| 862 | index, 'List index expected Int or Slice',
|
| 863 | loc.Missing)
|
| 864 |
|
| 865 | elif case(value_e.Dict):
|
| 866 | obj = cast(value.Dict, UP_obj)
|
| 867 | if index.tag() != value_e.Str:
|
| 868 | raise error.TypeErr(index, 'Dict index expected Str',
|
| 869 | loc.Missing)
|
| 870 |
|
| 871 | index = cast(value.Str, UP_index)
|
| 872 | try:
|
| 873 | return obj.d[index.s]
|
| 874 | except KeyError:
|
| 875 | # TODO: expr.Subscript has no error location
|
| 876 | raise error.Expr('Dict entry %r not found' % index.s,
|
| 877 | loc.Missing)
|
| 878 |
|
| 879 | raise error.TypeErr(obj, 'Subscript expected Str, List, or Dict',
|
| 880 | loc.Missing)
|
| 881 |
|
| 882 | def _EvalAttribute(self, node):
|
| 883 | # type: (Attribute) -> value_t
|
| 884 |
|
| 885 | o = self._EvalExpr(node.obj)
|
| 886 | UP_o = o
|
| 887 |
|
| 888 | with switch(node.op.id) as case:
|
| 889 | # Right now => is a synonym for ->
|
| 890 | # Later we may enforce that => is pure, and -> is for mutation and
|
| 891 | # I/O.
|
| 892 | if case(Id.Expr_RArrow, Id.Expr_RDArrow):
|
| 893 | name = node.attr_name
|
| 894 | # Look up builtin methods
|
| 895 | type_methods = self.methods.get(o.tag())
|
| 896 | vm_callable = (type_methods.get(name)
|
| 897 | if type_methods is not None else None)
|
| 898 | if vm_callable:
|
| 899 | func_val = value.BuiltinFunc(vm_callable)
|
| 900 | return value.BoundFunc(o, func_val)
|
| 901 |
|
| 902 | # If the operator is ->, fail because we don't have any
|
| 903 | # user-defined methods
|
| 904 | if node.op.id == Id.Expr_RArrow:
|
| 905 | raise error.TypeErrVerbose(
|
| 906 | 'Method %r does not exist on type %s' %
|
| 907 | (name, ui.ValType(o)), node.attr)
|
| 908 |
|
| 909 | # Operator is =>, so try function chaining.
|
| 910 |
|
| 911 | # Instead of str(f()) => upper()
|
| 912 | # or str(f()).upper() as in Pythohn
|
| 913 | #
|
| 914 | # It's more natural to write
|
| 915 | # f() => str() => upper()
|
| 916 |
|
| 917 | # Could improve error message: may give "Undefined variable"
|
| 918 | val = self._LookupVar(name, node.attr)
|
| 919 |
|
| 920 | with tagswitch(val) as case2:
|
| 921 | if case2(value_e.Func, value_e.BuiltinFunc):
|
| 922 | return value.BoundFunc(o, val)
|
| 923 | else:
|
| 924 | raise error.TypeErr(
|
| 925 | val, 'Fat arrow => expects method or function',
|
| 926 | node.attr)
|
| 927 |
|
| 928 | elif case(Id.Expr_Dot): # d.key is like d['key']
|
| 929 | name = node.attr_name
|
| 930 | with tagswitch(o) as case2:
|
| 931 | if case2(value_e.Dict):
|
| 932 | o = cast(value.Dict, UP_o)
|
| 933 | try:
|
| 934 | result = o.d[name]
|
| 935 | except KeyError:
|
| 936 | raise error.Expr('Dict entry %r not found' % name,
|
| 937 | node.op)
|
| 938 |
|
| 939 | else:
|
| 940 | raise error.TypeErr(o, 'Dot operator expected Dict',
|
| 941 | node.op)
|
| 942 |
|
| 943 | return result
|
| 944 |
|
| 945 | else:
|
| 946 | raise AssertionError(node.op)
|
| 947 |
|
| 948 | def _EvalExpr(self, node):
|
| 949 | # type: (expr_t) -> value_t
|
| 950 | """Turn an expression into a value."""
|
| 951 | if 0:
|
| 952 | print('_EvalExpr()')
|
| 953 | node.PrettyPrint()
|
| 954 | print('')
|
| 955 |
|
| 956 | UP_node = node
|
| 957 | with tagswitch(node) as case:
|
| 958 | if case(expr_e.Const):
|
| 959 | node = cast(expr.Const, UP_node)
|
| 960 | return self._EvalConst(node)
|
| 961 |
|
| 962 | elif case(expr_e.Var):
|
| 963 | node = cast(expr.Var, UP_node)
|
| 964 | return self._LookupVar(node.name, node.left)
|
| 965 |
|
| 966 | elif case(expr_e.Place):
|
| 967 | node = cast(expr.Place, UP_node)
|
| 968 | frame = self.mem.TopNamespace()
|
| 969 | return value.Place(LeftName(node.var_name, node.blame_tok),
|
| 970 | frame)
|
| 971 |
|
| 972 | elif case(expr_e.CommandSub):
|
| 973 | node = cast(CommandSub, UP_node)
|
| 974 |
|
| 975 | id_ = node.left_token.id
|
| 976 | if id_ == Id.Left_CaretParen: # ^(echo block literal)
|
| 977 | # TODO: Propgate location info?
|
| 978 | return value.Command(node.child)
|
| 979 | else:
|
| 980 | stdout_str = self.shell_ex.RunCommandSub(node)
|
| 981 | if id_ == Id.Left_AtParen: # @(seq 3)
|
| 982 | # TODO: Should use J8 lines
|
| 983 | strs = self.splitter.SplitForWordEval(stdout_str)
|
| 984 | items = [value.Str(s)
|
| 985 | for s in strs] # type: List[value_t]
|
| 986 | return value.List(items)
|
| 987 | else:
|
| 988 | return value.Str(stdout_str)
|
| 989 |
|
| 990 | elif case(expr_e.ShArrayLiteral): # var x = :| foo *.py |
|
| 991 | node = cast(ShArrayLiteral, UP_node)
|
| 992 | words = braces.BraceExpandWords(node.words)
|
| 993 | strs = self.word_ev.EvalWordSequence(words)
|
| 994 | #log('ARRAY LITERAL EVALUATED TO -> %s', strs)
|
| 995 | #return value.BashArray(strs)
|
| 996 |
|
| 997 | # It's equivalent to ['foo', 'bar']
|
| 998 | items = [value.Str(s) for s in strs]
|
| 999 | return value.List(items)
|
| 1000 |
|
| 1001 | elif case(expr_e.DoubleQuoted):
|
| 1002 | node = cast(DoubleQuoted, UP_node)
|
| 1003 | # In an ideal world, YSH would *statically* disallow:
|
| 1004 | #
|
| 1005 | # - "$@" and "${array[@]}"
|
| 1006 | # - backticks like `echo hi`
|
| 1007 | # - $(( 1+2 )) and $[] -- although useful for refactoring
|
| 1008 | # - not sure: ${x%%} -- could disallow this
|
| 1009 | # - these enters the ArgDQ state: "${a:-foo bar}" ?
|
| 1010 | #
|
| 1011 | # But that would complicate the parser/evaluator. So just rely
|
| 1012 | # on runtime strict_array to disallow the bad parts.
|
| 1013 | return value.Str(self.word_ev.EvalDoubleQuotedToString(node))
|
| 1014 |
|
| 1015 | elif case(expr_e.SingleQuoted):
|
| 1016 | node = cast(SingleQuoted, UP_node)
|
| 1017 | return value.Str(node.sval)
|
| 1018 |
|
| 1019 | elif case(expr_e.BracedVarSub):
|
| 1020 | node = cast(BracedVarSub, UP_node)
|
| 1021 | return value.Str(self.word_ev.EvalBracedVarSubToString(node))
|
| 1022 |
|
| 1023 | elif case(expr_e.SimpleVarSub):
|
| 1024 | node = cast(SimpleVarSub, UP_node)
|
| 1025 | return value.Str(self.word_ev.EvalSimpleVarSubToString(node))
|
| 1026 |
|
| 1027 | elif case(expr_e.Unary):
|
| 1028 | node = cast(expr.Unary, UP_node)
|
| 1029 | return self._EvalUnary(node)
|
| 1030 |
|
| 1031 | elif case(expr_e.Binary):
|
| 1032 | node = cast(expr.Binary, UP_node)
|
| 1033 | return self._EvalBinary(node)
|
| 1034 |
|
| 1035 | elif case(expr_e.Slice): # a[:0]
|
| 1036 | node = cast(expr.Slice, UP_node)
|
| 1037 |
|
| 1038 | lower = None # type: Optional[IntBox]
|
| 1039 | upper = None # type: Optional[IntBox]
|
| 1040 |
|
| 1041 | if node.lower:
|
| 1042 | msg = 'Slice begin should be Int'
|
| 1043 | i = val_ops.ToInt(self._EvalExpr(node.lower), msg,
|
| 1044 | loc.Missing)
|
| 1045 | lower = IntBox(i)
|
| 1046 |
|
| 1047 | if node.upper:
|
| 1048 | msg = 'Slice end should be Int'
|
| 1049 | i = val_ops.ToInt(self._EvalExpr(node.upper), msg,
|
| 1050 | loc.Missing)
|
| 1051 | upper = IntBox(i)
|
| 1052 |
|
| 1053 | return value.Slice(lower, upper)
|
| 1054 |
|
| 1055 | elif case(expr_e.Range):
|
| 1056 | node = cast(expr.Range, UP_node)
|
| 1057 |
|
| 1058 | assert node.lower is not None
|
| 1059 | assert node.upper is not None
|
| 1060 |
|
| 1061 | msg = 'Range begin should be Int'
|
| 1062 | i = val_ops.ToInt(self._EvalExpr(node.lower), msg, loc.Missing)
|
| 1063 |
|
| 1064 | msg = 'Range end should be Int'
|
| 1065 | j = val_ops.ToInt(self._EvalExpr(node.upper), msg, loc.Missing)
|
| 1066 |
|
| 1067 | return value.Range(i, j)
|
| 1068 |
|
| 1069 | elif case(expr_e.Compare):
|
| 1070 | node = cast(expr.Compare, UP_node)
|
| 1071 | return self._EvalCompare(node)
|
| 1072 |
|
| 1073 | elif case(expr_e.IfExp):
|
| 1074 | node = cast(expr.IfExp, UP_node)
|
| 1075 | b = val_ops.ToBool(self._EvalExpr(node.test))
|
| 1076 | if b:
|
| 1077 | return self._EvalExpr(node.body)
|
| 1078 | else:
|
| 1079 | return self._EvalExpr(node.orelse)
|
| 1080 |
|
| 1081 | elif case(expr_e.List):
|
| 1082 | node = cast(expr.List, UP_node)
|
| 1083 | items = [self._EvalExpr(e) for e in node.elts]
|
| 1084 | return value.List(items)
|
| 1085 |
|
| 1086 | elif case(expr_e.Tuple):
|
| 1087 | node = cast(expr.Tuple, UP_node)
|
| 1088 | # YSH language: Tuple syntax evaluates to LIST !
|
| 1089 | items = [self._EvalExpr(e) for e in node.elts]
|
| 1090 | return value.List(items)
|
| 1091 |
|
| 1092 | elif case(expr_e.Dict):
|
| 1093 | node = cast(expr.Dict, UP_node)
|
| 1094 |
|
| 1095 | kvals = [self._EvalExpr(e) for e in node.keys]
|
| 1096 | values = [] # type: List[value_t]
|
| 1097 |
|
| 1098 | for i, value_expr in enumerate(node.values):
|
| 1099 | if value_expr.tag() == expr_e.Implicit: # {key}
|
| 1100 | # Enforced by parser. Key is expr.Const
|
| 1101 | assert kvals[i].tag() == value_e.Str, kvals[i]
|
| 1102 | key = cast(value.Str, kvals[i])
|
| 1103 | v = self._LookupVar(key.s, loc.Missing)
|
| 1104 | else:
|
| 1105 | v = self._EvalExpr(value_expr)
|
| 1106 |
|
| 1107 | values.append(v)
|
| 1108 |
|
| 1109 | d = NewDict() # type: Dict[str, value_t]
|
| 1110 | for i, kval in enumerate(kvals):
|
| 1111 | k = val_ops.ToStr(kval, 'Dict keys must be strings',
|
| 1112 | loc.Missing)
|
| 1113 | d[k] = values[i]
|
| 1114 |
|
| 1115 | return value.Dict(d)
|
| 1116 |
|
| 1117 | elif case(expr_e.ListComp):
|
| 1118 | e_die_status(
|
| 1119 | 2, 'List comprehension reserved but not implemented')
|
| 1120 |
|
| 1121 | elif case(expr_e.GeneratorExp):
|
| 1122 | e_die_status(
|
| 1123 | 2, 'Generator expression reserved but not implemented')
|
| 1124 |
|
| 1125 | elif case(expr_e.Literal): # ^[1 + 2]
|
| 1126 | node = cast(expr.Literal, UP_node)
|
| 1127 | return value.Expr(node.inner)
|
| 1128 |
|
| 1129 | elif case(expr_e.Lambda): # |x| x+1 syntax is reserved
|
| 1130 | # TODO: Location information for |, or func
|
| 1131 | # Note: anonymous functions also evaluate to a Lambda, but they shouldn't
|
| 1132 | e_die_status(2, 'Lambda reserved but not implemented')
|
| 1133 |
|
| 1134 | elif case(expr_e.FuncCall):
|
| 1135 | node = cast(expr.FuncCall, UP_node)
|
| 1136 | return self._EvalFuncCall(node)
|
| 1137 |
|
| 1138 | elif case(expr_e.Subscript):
|
| 1139 | node = cast(Subscript, UP_node)
|
| 1140 | return self._EvalSubscript(node)
|
| 1141 |
|
| 1142 | elif case(expr_e.Attribute): # obj->method or mydict.key
|
| 1143 | node = cast(Attribute, UP_node)
|
| 1144 | return self._EvalAttribute(node)
|
| 1145 |
|
| 1146 | elif case(expr_e.Eggex):
|
| 1147 | node = cast(Eggex, UP_node)
|
| 1148 | return self.EvalEggex(node)
|
| 1149 |
|
| 1150 | else:
|
| 1151 | raise NotImplementedError(node.__class__.__name__)
|
| 1152 |
|
| 1153 | def EvalEggex(self, node):
|
| 1154 | # type: (Eggex) -> value.Eggex
|
| 1155 |
|
| 1156 | # Splice, check flags consistency, and accumulate convert_funcs indexed
|
| 1157 | # by capture group
|
| 1158 | ev = EggexEvaluator(self.mem, node.canonical_flags)
|
| 1159 | spliced = ev.EvalE(node.regex)
|
| 1160 |
|
| 1161 | # as_ere and capture_names filled by ~ operator or Str method
|
| 1162 | return value.Eggex(spliced, node.canonical_flags, ev.convert_funcs,
|
| 1163 | ev.convert_toks, None, [])
|
| 1164 |
|
| 1165 |
|
| 1166 | class EggexEvaluator(object):
|
| 1167 |
|
| 1168 | def __init__(self, mem, canonical_flags):
|
| 1169 | # type: (state.Mem, str) -> None
|
| 1170 | self.mem = mem
|
| 1171 | self.canonical_flags = canonical_flags
|
| 1172 | self.convert_funcs = [] # type: List[Optional[value_t]]
|
| 1173 | self.convert_toks = [] # type: List[Optional[Token]]
|
| 1174 |
|
| 1175 | def _LookupVar(self, name, var_loc):
|
| 1176 | # type: (str, loc_t) -> value_t
|
| 1177 | """
|
| 1178 | Duplicated from ExprEvaluator
|
| 1179 | """
|
| 1180 | return LookupVar(self.mem, name, scope_e.LocalOrGlobal, var_loc)
|
| 1181 |
|
| 1182 | def _EvalClassLiteralTerm(self, term, out):
|
| 1183 | # type: (class_literal_term_t, List[char_class_term_t]) -> None
|
| 1184 | UP_term = term
|
| 1185 |
|
| 1186 | # These 2 vars will be initialized if we don't return early
|
| 1187 | s = None # type: str
|
| 1188 | char_code_tok = None # type: Token
|
| 1189 |
|
| 1190 | with tagswitch(term) as case:
|
| 1191 |
|
| 1192 | if case(class_literal_term_e.CharCode):
|
| 1193 | term = cast(CharCode, UP_term)
|
| 1194 |
|
| 1195 | # What about \0? At runtime, ERE should disallow it. But we
|
| 1196 | # can also disallow it here.
|
| 1197 | out.append(term)
|
| 1198 | return
|
| 1199 |
|
| 1200 | elif case(class_literal_term_e.CharRange):
|
| 1201 | term = cast(CharRange, UP_term)
|
| 1202 | out.append(term)
|
| 1203 | return
|
| 1204 |
|
| 1205 | elif case(class_literal_term_e.PosixClass):
|
| 1206 | term = cast(PosixClass, UP_term)
|
| 1207 | out.append(term)
|
| 1208 | return
|
| 1209 |
|
| 1210 | elif case(class_literal_term_e.PerlClass):
|
| 1211 | term = cast(PerlClass, UP_term)
|
| 1212 | out.append(term)
|
| 1213 | return
|
| 1214 |
|
| 1215 | elif case(class_literal_term_e.SingleQuoted):
|
| 1216 | term = cast(SingleQuoted, UP_term)
|
| 1217 |
|
| 1218 | s = term.sval
|
| 1219 | char_code_tok = term.left
|
| 1220 |
|
| 1221 | elif case(class_literal_term_e.Splice):
|
| 1222 | term = cast(class_literal_term.Splice, UP_term)
|
| 1223 |
|
| 1224 | val = self._LookupVar(term.var_name, term.name)
|
| 1225 | s = val_ops.ToStr(val, 'Eggex char class splice expected Str',
|
| 1226 | term.name)
|
| 1227 | char_code_tok = term.name
|
| 1228 |
|
| 1229 | assert s is not None, term
|
| 1230 | for ch in s:
|
| 1231 | char_int = ord(ch)
|
| 1232 | if char_int >= 128:
|
| 1233 | # / [ '\x7f\xff' ] / is better written as / [ \x7f \xff ] /
|
| 1234 | e_die(
|
| 1235 | "Use unquoted char literal for byte %d, which is >= 128"
|
| 1236 | " (avoid confusing a set of bytes with a sequence)" %
|
| 1237 | char_int, char_code_tok)
|
| 1238 | out.append(CharCode(char_code_tok, char_int, False))
|
| 1239 |
|
| 1240 | def EvalE(self, node):
|
| 1241 | # type: (re_t) -> re_t
|
| 1242 | """Resolve references and eval constants in an Eggex
|
| 1243 |
|
| 1244 | Rules:
|
| 1245 | Splice => re_t # like Hex and @const in / Hex '.' @const /
|
| 1246 | Speck/Token (syntax) => Primitive (logical)
|
| 1247 | Chars and Strings => LiteralChars
|
| 1248 | """
|
| 1249 | UP_node = node
|
| 1250 |
|
| 1251 | with tagswitch(node) as case:
|
| 1252 | if case(re_e.Seq):
|
| 1253 | node = cast(re.Seq, UP_node)
|
| 1254 | new_children = [self.EvalE(child) for child in node.children]
|
| 1255 | return re.Seq(new_children)
|
| 1256 |
|
| 1257 | elif case(re_e.Alt):
|
| 1258 | node = cast(re.Alt, UP_node)
|
| 1259 | new_children = [self.EvalE(child) for child in node.children]
|
| 1260 | return re.Alt(new_children)
|
| 1261 |
|
| 1262 | elif case(re_e.Repeat):
|
| 1263 | node = cast(re.Repeat, UP_node)
|
| 1264 | return re.Repeat(self.EvalE(node.child), node.op)
|
| 1265 |
|
| 1266 | elif case(re_e.Group):
|
| 1267 | node = cast(re.Group, UP_node)
|
| 1268 |
|
| 1269 | # placeholder for non-capturing group
|
| 1270 | self.convert_funcs.append(None)
|
| 1271 | self.convert_toks.append(None)
|
| 1272 | return re.Group(self.EvalE(node.child))
|
| 1273 |
|
| 1274 | elif case(re_e.Capture): # Identical to Group
|
| 1275 | node = cast(re.Capture, UP_node)
|
| 1276 | convert_func = None # type: Optional[value_t]
|
| 1277 | convert_tok = None # type: Optional[Token]
|
| 1278 | if node.func_name:
|
| 1279 | func_name = lexer.LazyStr(node.func_name)
|
| 1280 | func_val = self.mem.GetValue(func_name)
|
| 1281 | with tagswitch(func_val) as case:
|
| 1282 | if case(value_e.Func, value_e.BuiltinFunc):
|
| 1283 | convert_func = func_val
|
| 1284 | convert_tok = node.func_name
|
| 1285 | else:
|
| 1286 | raise error.TypeErr(
|
| 1287 | func_val,
|
| 1288 | "Expected %r to be a func" % func_name,
|
| 1289 | node.func_name)
|
| 1290 |
|
| 1291 | self.convert_funcs.append(convert_func)
|
| 1292 | self.convert_toks.append(convert_tok)
|
| 1293 | return re.Capture(self.EvalE(node.child), node.name,
|
| 1294 | node.func_name)
|
| 1295 |
|
| 1296 | elif case(re_e.CharClassLiteral):
|
| 1297 | node = cast(re.CharClassLiteral, UP_node)
|
| 1298 |
|
| 1299 | new_terms = [] # type: List[char_class_term_t]
|
| 1300 | for t in node.terms:
|
| 1301 | # can get multiple char_class_term.CharCode for a
|
| 1302 | # class_literal_term_t
|
| 1303 | self._EvalClassLiteralTerm(t, new_terms)
|
| 1304 | return re.CharClass(node.negated, new_terms)
|
| 1305 |
|
| 1306 | elif case(re_e.SingleQuoted):
|
| 1307 | node = cast(SingleQuoted, UP_node)
|
| 1308 |
|
| 1309 | s = node.sval
|
| 1310 | return re.LiteralChars(node.left, s)
|
| 1311 |
|
| 1312 | elif case(re_e.Splice):
|
| 1313 | node = cast(re.Splice, UP_node)
|
| 1314 |
|
| 1315 | val = self._LookupVar(node.var_name, node.name)
|
| 1316 | UP_val = val
|
| 1317 | with tagswitch(val) as case:
|
| 1318 | if case(value_e.Str):
|
| 1319 | val = cast(value.Str, UP_val)
|
| 1320 | to_splice = re.LiteralChars(node.name,
|
| 1321 | val.s) # type: re_t
|
| 1322 |
|
| 1323 | elif case(value_e.Eggex):
|
| 1324 | val = cast(value.Eggex, UP_val)
|
| 1325 |
|
| 1326 | # Splicing means we get the conversion funcs too.
|
| 1327 | self.convert_funcs.extend(val.convert_funcs)
|
| 1328 | self.convert_toks.extend(val.convert_toks)
|
| 1329 |
|
| 1330 | # Splicing requires flags to match. This check is
|
| 1331 | # transitive.
|
| 1332 | to_splice = val.spliced
|
| 1333 |
|
| 1334 | if val.canonical_flags != self.canonical_flags:
|
| 1335 | e_die(
|
| 1336 | "Expected eggex flags %r, but got %r" %
|
| 1337 | (self.canonical_flags, val.canonical_flags),
|
| 1338 | node.name)
|
| 1339 |
|
| 1340 | else:
|
| 1341 | raise error.TypeErr(
|
| 1342 | val, 'Eggex splice expected Str or Eggex',
|
| 1343 | node.name)
|
| 1344 | return to_splice
|
| 1345 |
|
| 1346 | else:
|
| 1347 | # These are evaluated at translation time
|
| 1348 |
|
| 1349 | # case(re_e.Primitive)
|
| 1350 | # case(re_e.PosixClass)
|
| 1351 | # case(re_e.PerlClass)
|
| 1352 | return node
|
| 1353 |
|
| 1354 |
|
| 1355 | # vim: sw=4
|