| 1 | """
|
| 2 | runtime.py
|
| 3 | """
|
| 4 | from __future__ import print_function
|
| 5 |
|
| 6 | try:
|
| 7 | import cStringIO
|
| 8 | except ImportError:
|
| 9 | # Python 3 doesn't have cStringIO. Our yaks/ demo currently uses
|
| 10 | # mycpp/mylib.py with Python 3.
|
| 11 | cStringIO = None
|
| 12 | import io
|
| 13 |
|
| 14 | import sys
|
| 15 |
|
| 16 | from pylib import collections_
|
| 17 | try:
|
| 18 | import posix_ as posix
|
| 19 | except ImportError:
|
| 20 | # Hack for tangled dependencies.
|
| 21 | import os
|
| 22 | posix = os
|
| 23 |
|
| 24 | from typing import (Tuple, List, Dict, Optional, Iterator, Any, TypeVar,
|
| 25 | Generic, cast, TYPE_CHECKING)
|
| 26 |
|
| 27 | # For conditional translation
|
| 28 | CPP = False
|
| 29 | PYTHON = True
|
| 30 |
|
| 31 | # Use POSIX name directly
|
| 32 | STDIN_FILENO = 0
|
| 33 |
|
| 34 |
|
| 35 | def MaybeCollect():
|
| 36 | # type: () -> None
|
| 37 | pass
|
| 38 |
|
| 39 |
|
| 40 | def NewDict():
|
| 41 | # type: () -> Dict[str, Any]
|
| 42 | """Make dictionaries ordered in Python, e.g. for JSON.
|
| 43 |
|
| 44 | In C++, our Dict implementation should be ordered.
|
| 45 | """
|
| 46 | return collections_.OrderedDict()
|
| 47 |
|
| 48 |
|
| 49 | def log(msg, *args):
|
| 50 | # type: (str, *Any) -> None
|
| 51 | """Print debug output to stderr."""
|
| 52 | if args:
|
| 53 | msg = msg % args
|
| 54 | print(msg, file=sys.stderr)
|
| 55 |
|
| 56 |
|
| 57 | def print_stderr(s):
|
| 58 | # type: (str) -> None
|
| 59 | """Print a message to stderr for the user.
|
| 60 |
|
| 61 | This should be used sparingly, since it doesn't have location info, like
|
| 62 | ui.ErrorFormatter does. We use it to print fatal I/O errors that were only
|
| 63 | caught at the top level.
|
| 64 | """
|
| 65 | print(s, file=sys.stderr)
|
| 66 |
|
| 67 |
|
| 68 | #
|
| 69 | # Byte Operations avoid excessive allocations with string algorithms
|
| 70 | #
|
| 71 |
|
| 72 |
|
| 73 | def ByteAt(s, i):
|
| 74 | # type: (str, int) -> int
|
| 75 | """i must be in bounds."""
|
| 76 |
|
| 77 | # This simplifies the C++ implementation
|
| 78 | assert 0 <= i, 'No negative indices'
|
| 79 | assert i < len(s), 'No negative indices'
|
| 80 |
|
| 81 | return ord(s[i])
|
| 82 |
|
| 83 |
|
| 84 | def ByteEquals(byte, ch):
|
| 85 | # type: (int, str) -> bool
|
| 86 | assert len(ch) == 1, ch
|
| 87 | assert 0 <= byte < 256, byte
|
| 88 |
|
| 89 | return byte == ord(ch)
|
| 90 |
|
| 91 |
|
| 92 | def ByteInSet(byte, byte_set):
|
| 93 | # type: (int, str) -> bool
|
| 94 | assert 0 <= byte < 256, byte
|
| 95 |
|
| 96 | return chr(byte) in byte_set
|
| 97 |
|
| 98 |
|
| 99 | def JoinBytes(byte_list):
|
| 100 | # type: (List[int]) -> str
|
| 101 |
|
| 102 | return ''.join(chr(b) for b in byte_list)
|
| 103 |
|
| 104 |
|
| 105 | class File:
|
| 106 | """
|
| 107 | TODO: This should define a read/write interface, and then LineReader() and
|
| 108 | Writer() can possibly inherit it, with runtime assertions
|
| 109 |
|
| 110 | Then we allow downcasting from File -> LineReader, like we currently do in
|
| 111 | C++ in gc_mylib.h.
|
| 112 |
|
| 113 | Inheritance can't express the structural Reader/Writer pattern of Go, which
|
| 114 | would be better. I suppose we could use File* everywhere, but having
|
| 115 | fine-grained types is nicer. And there will be very few casts.
|
| 116 | """
|
| 117 | pass
|
| 118 |
|
| 119 |
|
| 120 | class LineReader:
|
| 121 |
|
| 122 | def readline(self):
|
| 123 | # type: () -> str
|
| 124 | raise NotImplementedError()
|
| 125 |
|
| 126 | def close(self):
|
| 127 | # type: () -> None
|
| 128 | raise NotImplementedError()
|
| 129 |
|
| 130 | def isatty(self):
|
| 131 | # type: () -> bool
|
| 132 | raise NotImplementedError()
|
| 133 |
|
| 134 |
|
| 135 | if TYPE_CHECKING:
|
| 136 |
|
| 137 | class BufLineReader(LineReader):
|
| 138 |
|
| 139 | def __init__(self, s):
|
| 140 | # type: (str) -> None
|
| 141 | raise NotImplementedError()
|
| 142 |
|
| 143 | def open(path):
|
| 144 | # type: (str) -> LineReader
|
| 145 |
|
| 146 | # TODO: should probably return mylib.File
|
| 147 | # mylib.open() is currently only used in yaks/yaks_main and
|
| 148 | # bin.osh_parse
|
| 149 | raise NotImplementedError()
|
| 150 |
|
| 151 | else:
|
| 152 | # Actual runtime
|
| 153 | if cStringIO:
|
| 154 | BufLineReader = cStringIO.StringIO
|
| 155 | else: # Python 3
|
| 156 | BufLineReader = io.StringIO
|
| 157 |
|
| 158 | open = open
|
| 159 |
|
| 160 |
|
| 161 | class Writer:
|
| 162 |
|
| 163 | def write(self, s):
|
| 164 | # type: (str) -> None
|
| 165 | raise NotImplementedError()
|
| 166 |
|
| 167 | def flush(self):
|
| 168 | # type: () -> None
|
| 169 | raise NotImplementedError()
|
| 170 |
|
| 171 | def isatty(self):
|
| 172 | # type: () -> bool
|
| 173 | raise NotImplementedError()
|
| 174 |
|
| 175 |
|
| 176 | class BufWriter(Writer):
|
| 177 | """Mimic StringIO API, but add clear() so we can reuse objects.
|
| 178 |
|
| 179 | We can also add accelerators for directly writing numbers, to avoid
|
| 180 | allocations when encoding JSON.
|
| 181 | """
|
| 182 |
|
| 183 | def __init__(self):
|
| 184 | # type: () -> None
|
| 185 | self.parts = []
|
| 186 |
|
| 187 | def write(self, s):
|
| 188 | # type: (str) -> None
|
| 189 | self.parts.append(s)
|
| 190 |
|
| 191 | def write_spaces(self, n):
|
| 192 | # type: (int) -> None
|
| 193 | """For JSON indenting. Avoid intermediate allocations in C++."""
|
| 194 | self.parts.append(' ' * n)
|
| 195 |
|
| 196 | def getvalue(self):
|
| 197 | # type: () -> str
|
| 198 | return ''.join(self.parts)
|
| 199 |
|
| 200 | def clear(self):
|
| 201 | # type: () -> None
|
| 202 | del self.parts[:]
|
| 203 |
|
| 204 |
|
| 205 | def Stdout():
|
| 206 | # type: () -> Writer
|
| 207 | return sys.stdout
|
| 208 |
|
| 209 |
|
| 210 | def Stderr():
|
| 211 | # type: () -> Writer
|
| 212 | return sys.stderr
|
| 213 |
|
| 214 |
|
| 215 | def Stdin():
|
| 216 | # type: () -> LineReader
|
| 217 | return sys.stdin
|
| 218 |
|
| 219 |
|
| 220 | class switch(object):
|
| 221 | """Translates to C switch on int.
|
| 222 |
|
| 223 | with tagswitch(i) as case:
|
| 224 | if case(42, 43):
|
| 225 | print('hi')
|
| 226 | elif case(99):
|
| 227 | print('two')
|
| 228 | else:
|
| 229 | print('neither')
|
| 230 | """
|
| 231 |
|
| 232 | def __init__(self, value):
|
| 233 | # type: (int) -> None
|
| 234 | self.value = value
|
| 235 |
|
| 236 | def __enter__(self):
|
| 237 | # type: () -> switch
|
| 238 | return self
|
| 239 |
|
| 240 | def __exit__(self, type, value, traceback):
|
| 241 | # type: (Any, Any, Any) -> bool
|
| 242 | return False # Allows a traceback to occur
|
| 243 |
|
| 244 | def __call__(self, *cases):
|
| 245 | # type: (*Any) -> bool
|
| 246 | return self.value in cases
|
| 247 |
|
| 248 |
|
| 249 | class str_switch(object):
|
| 250 | """Translates to fast dispatch on string length, then memcmp()."""
|
| 251 |
|
| 252 | def __init__(self, value):
|
| 253 | # type: (str) -> None
|
| 254 | self.value = value
|
| 255 |
|
| 256 | def __enter__(self):
|
| 257 | # type: () -> switch
|
| 258 | return self
|
| 259 |
|
| 260 | def __exit__(self, type, value, traceback):
|
| 261 | # type: (Any, Any, Any) -> bool
|
| 262 | return False # Allows a traceback to occur
|
| 263 |
|
| 264 | def __call__(self, *cases):
|
| 265 | # type: (*Any) -> bool
|
| 266 | return self.value in cases
|
| 267 |
|
| 268 |
|
| 269 | class tagswitch(object):
|
| 270 | """A ContextManager that translates to switch statement over ASDL types."""
|
| 271 |
|
| 272 | def __init__(self, node):
|
| 273 | # type: (Any) -> None
|
| 274 | self.tag = node.tag()
|
| 275 |
|
| 276 | def __enter__(self):
|
| 277 | # type: () -> tagswitch
|
| 278 | return self
|
| 279 |
|
| 280 | def __exit__(self, type, value, traceback):
|
| 281 | # type: (Any, Any, Any) -> bool
|
| 282 | return False # Allows a traceback to occur
|
| 283 |
|
| 284 | def __call__(self, *cases):
|
| 285 | # type: (*Any) -> bool
|
| 286 | return self.tag in cases
|
| 287 |
|
| 288 |
|
| 289 | if TYPE_CHECKING:
|
| 290 | # Doesn't work
|
| 291 | T = TypeVar('T')
|
| 292 | class StackArray(Generic[T]):
|
| 293 | def __init__(self):
|
| 294 | self.items = [] # type: List[T]
|
| 295 |
|
| 296 | def append(self, item):
|
| 297 | # type: (T) -> None
|
| 298 | self.items.append(item)
|
| 299 |
|
| 300 | def pop(self):
|
| 301 | # type: () -> T
|
| 302 | return self.items.pop()
|
| 303 |
|
| 304 | # Doesn't work, this is only for primitive types
|
| 305 | #StackArray = NewType('StackArray', list)
|
| 306 |
|
| 307 |
|
| 308 | def MakeStackArray(item_type):
|
| 309 | # type: (TypeVar) -> StackArray[item_type]
|
| 310 | """
|
| 311 | Convenience "constructor" used like this:
|
| 312 |
|
| 313 | myarray = MakeStackArray(int)
|
| 314 |
|
| 315 | The idiom could also be
|
| 316 |
|
| 317 | myarray = cast('StackArray[int]', [])
|
| 318 |
|
| 319 | But that's uglier.
|
| 320 | """
|
| 321 | return cast('StackArray[item_type]', [])
|
| 322 |
|
| 323 |
|
| 324 | if TYPE_CHECKING:
|
| 325 | K = TypeVar('K')
|
| 326 | V = TypeVar('V')
|
| 327 |
|
| 328 |
|
| 329 | def iteritems(d):
|
| 330 | # type: (Dict[K, V]) -> Iterator[Tuple[K, V]]
|
| 331 | """Make translation a bit easier."""
|
| 332 | return d.iteritems()
|
| 333 |
|
| 334 |
|
| 335 | def split_once(s, delim):
|
| 336 | # type: (str, str) -> Tuple[str, Optional[str]]
|
| 337 | """Easier to call than split(s, 1) because of tuple unpacking."""
|
| 338 |
|
| 339 | parts = s.split(delim, 1)
|
| 340 | if len(parts) == 1:
|
| 341 | no_str = None # type: Optional[str]
|
| 342 | return s, no_str
|
| 343 | else:
|
| 344 | return parts[0], parts[1]
|
| 345 |
|
| 346 |
|
| 347 | def hex_lower(i):
|
| 348 | # type: (int) -> str
|
| 349 | return '%x' % i
|
| 350 |
|
| 351 |
|
| 352 | def hex_upper(i):
|
| 353 | # type: (int) -> str
|
| 354 | return '%X' % i
|
| 355 |
|
| 356 |
|
| 357 | def octal(i):
|
| 358 | # type: (int) -> str
|
| 359 | return '%o' % i
|
| 360 |
|
| 361 |
|
| 362 | def dict_erase(d, key):
|
| 363 | # type: (Dict[Any, Any], Any) -> None
|
| 364 | """
|
| 365 | Ensure that a key isn't in the Dict d. This makes C++ translation easier.
|
| 366 | """
|
| 367 | try:
|
| 368 | del d[key]
|
| 369 | except KeyError:
|
| 370 | pass
|
| 371 |
|
| 372 |
|
| 373 | def str_cmp(s1, s2):
|
| 374 | # type: (str, str) -> int
|
| 375 | if s1 == s2:
|
| 376 | return 0
|
| 377 | if s1 < s2:
|
| 378 | return -1
|
| 379 | else:
|
| 380 | return 1
|
| 381 |
|
| 382 |
|
| 383 | class UniqueObjects(object):
|
| 384 | """A set of objects identified by their address in memory
|
| 385 |
|
| 386 | Python's id(obj) returns the address of any object. But we don't simply
|
| 387 | implement it, because it requires a uint64_t on 64-bit systems, while mycpp
|
| 388 | only supports 'int'.
|
| 389 |
|
| 390 | So we have a whole class.
|
| 391 |
|
| 392 | Should be used for:
|
| 393 |
|
| 394 | - Cycle detection when pretty printing, as Python's repr() does
|
| 395 | - See CPython's Objects/object.c PyObject_Repr()
|
| 396 | /* These methods are used to control infinite recursion in repr, str, print,
|
| 397 | etc. Container objects that may recursively contain themselves,
|
| 398 | e.g. builtin dictionaries and lists, should use Py_ReprEnter() and
|
| 399 | Py_ReprLeave() to avoid infinite recursion.
|
| 400 | */
|
| 401 | - e.g. dictobject.c dict_repr() calls Py_ReprEnter() to print {...}
|
| 402 | - In Python 2.7 a GLOBAL VAR is used
|
| 403 |
|
| 404 | - It also checks for STACK OVERFLOW
|
| 405 |
|
| 406 | - Packle serialization
|
| 407 | """
|
| 408 |
|
| 409 | def __init__(self):
|
| 410 | # 64-bit id() -> small integer ID
|
| 411 | self.addresses = {} # type: Dict[int, int]
|
| 412 |
|
| 413 | def Contains(self, obj):
|
| 414 | # type: (Any) -> bool
|
| 415 | """ Convenience? """
|
| 416 | return self.Get(obj) != -1
|
| 417 |
|
| 418 | def MaybeAdd(self, obj):
|
| 419 | # type: (Any) -> None
|
| 420 | """ Convenience? """
|
| 421 |
|
| 422 | # def AddNewObject(self, obj):
|
| 423 | def Add(self, obj):
|
| 424 | # type: (Any) -> None
|
| 425 | """
|
| 426 | Assert it isn't already there, and assign a new ID!
|
| 427 |
|
| 428 | # Lib/pickle does:
|
| 429 |
|
| 430 | self.memo[id(obj)] = memo_len, obj
|
| 431 |
|
| 432 | I guess that's the object ID and a void*
|
| 433 |
|
| 434 | Then it does:
|
| 435 |
|
| 436 | x = self.memo.get(id(obj))
|
| 437 |
|
| 438 | and
|
| 439 |
|
| 440 | # If the object is already in the memo, this means it is
|
| 441 | # recursive. In this case, throw away everything we put on the
|
| 442 | # stack, and fetch the object back from the memo.
|
| 443 | if id(obj) in self.memo:
|
| 444 | write(POP + self.get(self.memo[id(obj)][0]))
|
| 445 |
|
| 446 | BUT It only uses the numeric ID!
|
| 447 | """
|
| 448 | addr = id(obj)
|
| 449 | assert addr not in self.addresses
|
| 450 | self.addresses[addr] = len(self.addresses)
|
| 451 |
|
| 452 | def Get(self, obj):
|
| 453 | # type: (Any) -> int
|
| 454 | """
|
| 455 | Returns unique ID assigned
|
| 456 |
|
| 457 | Returns -1 if it doesn't exist?
|
| 458 | """
|
| 459 | addr = id(obj)
|
| 460 | return self.addresses.get(addr, -1)
|
| 461 |
|
| 462 | # Note: self.memo.clear() doesn't appear to be used
|
| 463 |
|
| 464 |
|
| 465 | if 0:
|
| 466 | # Prototype of Unix file descriptor I/O, compared with FILE* libc I/O.
|
| 467 | # Doesn't seem like we need this now.
|
| 468 |
|
| 469 | # Short versions of STDOUT_FILENO and STDERR_FILENO
|
| 470 | kStdout = 1
|
| 471 | kStderr = 2
|
| 472 |
|
| 473 | def writeln(s, fd=kStdout):
|
| 474 | # type: (str, int) -> None
|
| 475 | """Write a line. The name is consistent with JavaScript writeln() and Rust.
|
| 476 |
|
| 477 | e.g.
|
| 478 | writeln("x = %d" % x, kStderr)
|
| 479 |
|
| 480 | TODO: The Oil interpreter shouldn't use print() anywhere. Instead it can use
|
| 481 | writeln(s) and writeln(s, kStderr)
|
| 482 | """
|
| 483 | posix.write(fd, s)
|
| 484 | posix.write(fd, '\n')
|
| 485 |
|
| 486 | class File(object):
|
| 487 | """Custom file wrapper for Unix I/O like write() read()
|
| 488 |
|
| 489 | Not C I/O like fwrite() fread(). There should be no flush().
|
| 490 | """
|
| 491 |
|
| 492 | def __init__(self, fd):
|
| 493 | # type: (int) -> None
|
| 494 | self.fd = fd
|
| 495 |
|
| 496 | def write(self, s):
|
| 497 | # type: (str) -> None
|
| 498 | posix.write(self.fd, s)
|
| 499 |
|
| 500 | def writeln(self, s):
|
| 501 | # type: (str) -> None
|
| 502 | writeln(s, fd=self.fd)
|