The Tor Browser / file comparison
comparison: media/webrtc/trunk/testing/gtest/scripts/pump.py
media/webrtc/trunk/testing/gtest/scripts/pump.py
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| -1:000000000000 | 0:e3126c60a4bb |
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| 1 #!/usr/bin/env python | |
| 2 # | |
| 3 # Copyright 2008, Google Inc. | |
| 4 # All rights reserved. | |
| 5 # | |
| 6 # Redistribution and use in source and binary forms, with or without | |
| 7 # modification, are permitted provided that the following conditions are | |
| 8 # met: | |
| 9 # | |
| 10 # * Redistributions of source code must retain the above copyright | |
| 11 # notice, this list of conditions and the following disclaimer. | |
| 12 # * Redistributions in binary form must reproduce the above | |
| 13 # copyright notice, this list of conditions and the following disclaimer | |
| 14 # in the documentation and/or other materials provided with the | |
| 15 # distribution. | |
| 16 # * Neither the name of Google Inc. nor the names of its | |
| 17 # contributors may be used to endorse or promote products derived from | |
| 18 # this software without specific prior written permission. | |
| 19 # | |
| 20 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 21 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 22 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 23 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 24 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 25 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 26 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 27 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 28 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 29 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 30 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 31 | |
| 32 """pump v0.2.0 - Pretty Useful for Meta Programming. | |
| 33 | |
| 34 A tool for preprocessor meta programming. Useful for generating | |
| 35 repetitive boilerplate code. Especially useful for writing C++ | |
| 36 classes, functions, macros, and templates that need to work with | |
| 37 various number of arguments. | |
| 38 | |
| 39 USAGE: | |
| 40 pump.py SOURCE_FILE | |
| 41 | |
| 42 EXAMPLES: | |
| 43 pump.py foo.cc.pump | |
| 44 Converts foo.cc.pump to foo.cc. | |
| 45 | |
| 46 GRAMMAR: | |
| 47 CODE ::= ATOMIC_CODE* | |
| 48 ATOMIC_CODE ::= $var ID = EXPRESSION | |
| 49 | $var ID = [[ CODE ]] | |
| 50 | $range ID EXPRESSION..EXPRESSION | |
| 51 | $for ID SEPARATOR [[ CODE ]] | |
| 52 | $($) | |
| 53 | $ID | |
| 54 | $(EXPRESSION) | |
| 55 | $if EXPRESSION [[ CODE ]] ELSE_BRANCH | |
| 56 | [[ CODE ]] | |
| 57 | RAW_CODE | |
| 58 SEPARATOR ::= RAW_CODE | EMPTY | |
| 59 ELSE_BRANCH ::= $else [[ CODE ]] | |
| 60 | $elif EXPRESSION [[ CODE ]] ELSE_BRANCH | |
| 61 | EMPTY | |
| 62 EXPRESSION has Python syntax. | |
| 63 """ | |
| 64 | |
| 65 __author__ = 'wan@google.com (Zhanyong Wan)' | |
| 66 | |
| 67 import os | |
| 68 import re | |
| 69 import sys | |
| 70 | |
| 71 | |
| 72 TOKEN_TABLE = [ | |
| 73 (re.compile(r'\$var\s+'), '$var'), | |
| 74 (re.compile(r'\$elif\s+'), '$elif'), | |
| 75 (re.compile(r'\$else\s+'), '$else'), | |
| 76 (re.compile(r'\$for\s+'), '$for'), | |
| 77 (re.compile(r'\$if\s+'), '$if'), | |
| 78 (re.compile(r'\$range\s+'), '$range'), | |
| 79 (re.compile(r'\$[_A-Za-z]\w*'), '$id'), | |
| 80 (re.compile(r'\$\(\$\)'), '$($)'), | |
| 81 (re.compile(r'\$'), '$'), | |
| 82 (re.compile(r'\[\[\n?'), '[['), | |
| 83 (re.compile(r'\]\]\n?'), ']]'), | |
| 84 ] | |
| 85 | |
| 86 | |
| 87 class Cursor: | |
| 88 """Represents a position (line and column) in a text file.""" | |
| 89 | |
| 90 def __init__(self, line=-1, column=-1): | |
| 91 self.line = line | |
| 92 self.column = column | |
| 93 | |
| 94 def __eq__(self, rhs): | |
| 95 return self.line == rhs.line and self.column == rhs.column | |
| 96 | |
| 97 def __ne__(self, rhs): | |
| 98 return not self == rhs | |
| 99 | |
| 100 def __lt__(self, rhs): | |
| 101 return self.line < rhs.line or ( | |
| 102 self.line == rhs.line and self.column < rhs.column) | |
| 103 | |
| 104 def __le__(self, rhs): | |
| 105 return self < rhs or self == rhs | |
| 106 | |
| 107 def __gt__(self, rhs): | |
| 108 return rhs < self | |
| 109 | |
| 110 def __ge__(self, rhs): | |
| 111 return rhs <= self | |
| 112 | |
| 113 def __str__(self): | |
| 114 if self == Eof(): | |
| 115 return 'EOF' | |
| 116 else: | |
| 117 return '%s(%s)' % (self.line + 1, self.column) | |
| 118 | |
| 119 def __add__(self, offset): | |
| 120 return Cursor(self.line, self.column + offset) | |
| 121 | |
| 122 def __sub__(self, offset): | |
| 123 return Cursor(self.line, self.column - offset) | |
| 124 | |
| 125 def Clone(self): | |
| 126 """Returns a copy of self.""" | |
| 127 | |
| 128 return Cursor(self.line, self.column) | |
| 129 | |
| 130 | |
| 131 # Special cursor to indicate the end-of-file. | |
| 132 def Eof(): | |
| 133 """Returns the special cursor to denote the end-of-file.""" | |
| 134 return Cursor(-1, -1) | |
| 135 | |
| 136 | |
| 137 class Token: | |
| 138 """Represents a token in a Pump source file.""" | |
| 139 | |
| 140 def __init__(self, start=None, end=None, value=None, token_type=None): | |
| 141 if start is None: | |
| 142 self.start = Eof() | |
| 143 else: | |
| 144 self.start = start | |
| 145 if end is None: | |
| 146 self.end = Eof() | |
| 147 else: | |
| 148 self.end = end | |
| 149 self.value = value | |
| 150 self.token_type = token_type | |
| 151 | |
| 152 def __str__(self): | |
| 153 return 'Token @%s: \'%s\' type=%s' % ( | |
| 154 self.start, self.value, self.token_type) | |
| 155 | |
| 156 def Clone(self): | |
| 157 """Returns a copy of self.""" | |
| 158 | |
| 159 return Token(self.start.Clone(), self.end.Clone(), self.value, | |
| 160 self.token_type) | |
| 161 | |
| 162 | |
| 163 def StartsWith(lines, pos, string): | |
| 164 """Returns True iff the given position in lines starts with 'string'.""" | |
| 165 | |
| 166 return lines[pos.line][pos.column:].startswith(string) | |
| 167 | |
| 168 | |
| 169 def FindFirstInLine(line, token_table): | |
| 170 best_match_start = -1 | |
| 171 for (regex, token_type) in token_table: | |
| 172 m = regex.search(line) | |
| 173 if m: | |
| 174 # We found regex in lines | |
| 175 if best_match_start < 0 or m.start() < best_match_start: | |
| 176 best_match_start = m.start() | |
| 177 best_match_length = m.end() - m.start() | |
| 178 best_match_token_type = token_type | |
| 179 | |
| 180 if best_match_start < 0: | |
| 181 return None | |
| 182 | |
| 183 return (best_match_start, best_match_length, best_match_token_type) | |
| 184 | |
| 185 | |
| 186 def FindFirst(lines, token_table, cursor): | |
| 187 """Finds the first occurrence of any string in strings in lines.""" | |
| 188 | |
| 189 start = cursor.Clone() | |
| 190 cur_line_number = cursor.line | |
| 191 for line in lines[start.line:]: | |
| 192 if cur_line_number == start.line: | |
| 193 line = line[start.column:] | |
| 194 m = FindFirstInLine(line, token_table) | |
| 195 if m: | |
| 196 # We found a regex in line. | |
| 197 (start_column, length, token_type) = m | |
| 198 if cur_line_number == start.line: | |
| 199 start_column += start.column | |
| 200 found_start = Cursor(cur_line_number, start_column) | |
| 201 found_end = found_start + length | |
| 202 return MakeToken(lines, found_start, found_end, token_type) | |
| 203 cur_line_number += 1 | |
| 204 # We failed to find str in lines | |
| 205 return None | |
| 206 | |
| 207 | |
| 208 def SubString(lines, start, end): | |
| 209 """Returns a substring in lines.""" | |
| 210 | |
| 211 if end == Eof(): | |
| 212 end = Cursor(len(lines) - 1, len(lines[-1])) | |
| 213 | |
| 214 if start >= end: | |
| 215 return '' | |
| 216 | |
| 217 if start.line == end.line: | |
| 218 return lines[start.line][start.column:end.column] | |
| 219 | |
| 220 result_lines = ([lines[start.line][start.column:]] + | |
| 221 lines[start.line + 1:end.line] + | |
| 222 [lines[end.line][:end.column]]) | |
| 223 return ''.join(result_lines) | |
| 224 | |
| 225 | |
| 226 def StripMetaComments(str): | |
| 227 """Strip meta comments from each line in the given string.""" | |
| 228 | |
| 229 # First, completely remove lines containing nothing but a meta | |
| 230 # comment, including the trailing \n. | |
| 231 str = re.sub(r'^\s*\$\$.*\n', '', str) | |
| 232 | |
| 233 # Then, remove meta comments from contentful lines. | |
| 234 return re.sub(r'\s*\$\$.*', '', str) | |
| 235 | |
| 236 | |
| 237 def MakeToken(lines, start, end, token_type): | |
| 238 """Creates a new instance of Token.""" | |
| 239 | |
| 240 return Token(start, end, SubString(lines, start, end), token_type) | |
| 241 | |
| 242 | |
| 243 def ParseToken(lines, pos, regex, token_type): | |
| 244 line = lines[pos.line][pos.column:] | |
| 245 m = regex.search(line) | |
| 246 if m and not m.start(): | |
| 247 return MakeToken(lines, pos, pos + m.end(), token_type) | |
| 248 else: | |
| 249 print 'ERROR: %s expected at %s.' % (token_type, pos) | |
| 250 sys.exit(1) | |
| 251 | |
| 252 | |
| 253 ID_REGEX = re.compile(r'[_A-Za-z]\w*') | |
| 254 EQ_REGEX = re.compile(r'=') | |
| 255 REST_OF_LINE_REGEX = re.compile(r'.*?(?=$|\$\$)') | |
| 256 OPTIONAL_WHITE_SPACES_REGEX = re.compile(r'\s*') | |
| 257 WHITE_SPACE_REGEX = re.compile(r'\s') | |
| 258 DOT_DOT_REGEX = re.compile(r'\.\.') | |
| 259 | |
| 260 | |
| 261 def Skip(lines, pos, regex): | |
| 262 line = lines[pos.line][pos.column:] | |
| 263 m = re.search(regex, line) | |
| 264 if m and not m.start(): | |
| 265 return pos + m.end() | |
| 266 else: | |
| 267 return pos | |
| 268 | |
| 269 | |
| 270 def SkipUntil(lines, pos, regex, token_type): | |
| 271 line = lines[pos.line][pos.column:] | |
| 272 m = re.search(regex, line) | |
| 273 if m: | |
| 274 return pos + m.start() | |
| 275 else: | |
| 276 print ('ERROR: %s expected on line %s after column %s.' % | |
| 277 (token_type, pos.line + 1, pos.column)) | |
| 278 sys.exit(1) | |
| 279 | |
| 280 | |
| 281 def ParseExpTokenInParens(lines, pos): | |
| 282 def ParseInParens(pos): | |
| 283 pos = Skip(lines, pos, OPTIONAL_WHITE_SPACES_REGEX) | |
| 284 pos = Skip(lines, pos, r'\(') | |
| 285 pos = Parse(pos) | |
| 286 pos = Skip(lines, pos, r'\)') | |
| 287 return pos | |
| 288 | |
| 289 def Parse(pos): | |
| 290 pos = SkipUntil(lines, pos, r'\(|\)', ')') | |
| 291 if SubString(lines, pos, pos + 1) == '(': | |
| 292 pos = Parse(pos + 1) | |
| 293 pos = Skip(lines, pos, r'\)') | |
| 294 return Parse(pos) | |
| 295 else: | |
| 296 return pos | |
| 297 | |
| 298 start = pos.Clone() | |
| 299 pos = ParseInParens(pos) | |
| 300 return MakeToken(lines, start, pos, 'exp') | |
| 301 | |
| 302 | |
| 303 def RStripNewLineFromToken(token): | |
| 304 if token.value.endswith('\n'): | |
| 305 return Token(token.start, token.end, token.value[:-1], token.token_type) | |
| 306 else: | |
| 307 return token | |
| 308 | |
| 309 | |
| 310 def TokenizeLines(lines, pos): | |
| 311 while True: | |
| 312 found = FindFirst(lines, TOKEN_TABLE, pos) | |
| 313 if not found: | |
| 314 yield MakeToken(lines, pos, Eof(), 'code') | |
| 315 return | |
| 316 | |
| 317 if found.start == pos: | |
| 318 prev_token = None | |
| 319 prev_token_rstripped = None | |
| 320 else: | |
| 321 prev_token = MakeToken(lines, pos, found.start, 'code') | |
| 322 prev_token_rstripped = RStripNewLineFromToken(prev_token) | |
| 323 | |
| 324 if found.token_type == '$var': | |
| 325 if prev_token_rstripped: | |
| 326 yield prev_token_rstripped | |
| 327 yield found | |
| 328 id_token = ParseToken(lines, found.end, ID_REGEX, 'id') | |
| 329 yield id_token | |
| 330 pos = Skip(lines, id_token.end, OPTIONAL_WHITE_SPACES_REGEX) | |
| 331 | |
| 332 eq_token = ParseToken(lines, pos, EQ_REGEX, '=') | |
| 333 yield eq_token | |
| 334 pos = Skip(lines, eq_token.end, r'\s*') | |
| 335 | |
| 336 if SubString(lines, pos, pos + 2) != '[[': | |
| 337 exp_token = ParseToken(lines, pos, REST_OF_LINE_REGEX, 'exp') | |
| 338 yield exp_token | |
| 339 pos = Cursor(exp_token.end.line + 1, 0) | |
| 340 elif found.token_type == '$for': | |
| 341 if prev_token_rstripped: | |
| 342 yield prev_token_rstripped | |
| 343 yield found | |
| 344 id_token = ParseToken(lines, found.end, ID_REGEX, 'id') | |
| 345 yield id_token | |
| 346 pos = Skip(lines, id_token.end, WHITE_SPACE_REGEX) | |
| 347 elif found.token_type == '$range': | |
| 348 if prev_token_rstripped: | |
| 349 yield prev_token_rstripped | |
| 350 yield found | |
| 351 id_token = ParseToken(lines, found.end, ID_REGEX, 'id') | |
| 352 yield id_token | |
| 353 pos = Skip(lines, id_token.end, OPTIONAL_WHITE_SPACES_REGEX) | |
| 354 | |
| 355 dots_pos = SkipUntil(lines, pos, DOT_DOT_REGEX, '..') | |
| 356 yield MakeToken(lines, pos, dots_pos, 'exp') | |
| 357 yield MakeToken(lines, dots_pos, dots_pos + 2, '..') | |
| 358 pos = dots_pos + 2 | |
| 359 new_pos = Cursor(pos.line + 1, 0) | |
| 360 yield MakeToken(lines, pos, new_pos, 'exp') | |
| 361 pos = new_pos | |
| 362 elif found.token_type == '$': | |
| 363 if prev_token: | |
| 364 yield prev_token | |
| 365 yield found | |
| 366 exp_token = ParseExpTokenInParens(lines, found.end) | |
| 367 yield exp_token | |
| 368 pos = exp_token.end | |
| 369 elif (found.token_type == ']]' or found.token_type == '$if' or | |
| 370 found.token_type == '$elif' or found.token_type == '$else'): | |
| 371 if prev_token_rstripped: | |
| 372 yield prev_token_rstripped | |
| 373 yield found | |
| 374 pos = found.end | |
| 375 else: | |
| 376 if prev_token: | |
| 377 yield prev_token | |
| 378 yield found | |
| 379 pos = found.end | |
| 380 | |
| 381 | |
| 382 def Tokenize(s): | |
| 383 """A generator that yields the tokens in the given string.""" | |
| 384 if s != '': | |
| 385 lines = s.splitlines(True) | |
| 386 for token in TokenizeLines(lines, Cursor(0, 0)): | |
| 387 yield token | |
| 388 | |
| 389 | |
| 390 class CodeNode: | |
| 391 def __init__(self, atomic_code_list=None): | |
| 392 self.atomic_code = atomic_code_list | |
| 393 | |
| 394 | |
| 395 class VarNode: | |
| 396 def __init__(self, identifier=None, atomic_code=None): | |
| 397 self.identifier = identifier | |
| 398 self.atomic_code = atomic_code | |
| 399 | |
| 400 | |
| 401 class RangeNode: | |
| 402 def __init__(self, identifier=None, exp1=None, exp2=None): | |
| 403 self.identifier = identifier | |
| 404 self.exp1 = exp1 | |
| 405 self.exp2 = exp2 | |
| 406 | |
| 407 | |
| 408 class ForNode: | |
| 409 def __init__(self, identifier=None, sep=None, code=None): | |
| 410 self.identifier = identifier | |
| 411 self.sep = sep | |
| 412 self.code = code | |
| 413 | |
| 414 | |
| 415 class ElseNode: | |
| 416 def __init__(self, else_branch=None): | |
| 417 self.else_branch = else_branch | |
| 418 | |
| 419 | |
| 420 class IfNode: | |
| 421 def __init__(self, exp=None, then_branch=None, else_branch=None): | |
| 422 self.exp = exp | |
| 423 self.then_branch = then_branch | |
| 424 self.else_branch = else_branch | |
| 425 | |
| 426 | |
| 427 class RawCodeNode: | |
| 428 def __init__(self, token=None): | |
| 429 self.raw_code = token | |
| 430 | |
| 431 | |
| 432 class LiteralDollarNode: | |
| 433 def __init__(self, token): | |
| 434 self.token = token | |
| 435 | |
| 436 | |
| 437 class ExpNode: | |
| 438 def __init__(self, token, python_exp): | |
| 439 self.token = token | |
| 440 self.python_exp = python_exp | |
| 441 | |
| 442 | |
| 443 def PopFront(a_list): | |
| 444 head = a_list[0] | |
| 445 a_list[:1] = [] | |
| 446 return head | |
| 447 | |
| 448 | |
| 449 def PushFront(a_list, elem): | |
| 450 a_list[:0] = [elem] | |
| 451 | |
| 452 | |
| 453 def PopToken(a_list, token_type=None): | |
| 454 token = PopFront(a_list) | |
| 455 if token_type is not None and token.token_type != token_type: | |
| 456 print 'ERROR: %s expected at %s' % (token_type, token.start) | |
| 457 print 'ERROR: %s found instead' % (token,) | |
| 458 sys.exit(1) | |
| 459 | |
| 460 return token | |
| 461 | |
| 462 | |
| 463 def PeekToken(a_list): | |
| 464 if not a_list: | |
| 465 return None | |
| 466 | |
| 467 return a_list[0] | |
| 468 | |
| 469 | |
| 470 def ParseExpNode(token): | |
| 471 python_exp = re.sub(r'([_A-Za-z]\w*)', r'self.GetValue("\1")', token.value) | |
| 472 return ExpNode(token, python_exp) | |
| 473 | |
| 474 | |
| 475 def ParseElseNode(tokens): | |
| 476 def Pop(token_type=None): | |
| 477 return PopToken(tokens, token_type) | |
| 478 | |
| 479 next = PeekToken(tokens) | |
| 480 if not next: | |
| 481 return None | |
| 482 if next.token_type == '$else': | |
| 483 Pop('$else') | |
| 484 Pop('[[') | |
| 485 code_node = ParseCodeNode(tokens) | |
| 486 Pop(']]') | |
| 487 return code_node | |
| 488 elif next.token_type == '$elif': | |
| 489 Pop('$elif') | |
| 490 exp = Pop('code') | |
| 491 Pop('[[') | |
| 492 code_node = ParseCodeNode(tokens) | |
| 493 Pop(']]') | |
| 494 inner_else_node = ParseElseNode(tokens) | |
| 495 return CodeNode([IfNode(ParseExpNode(exp), code_node, inner_else_node)]) | |
| 496 elif not next.value.strip(): | |
| 497 Pop('code') | |
| 498 return ParseElseNode(tokens) | |
| 499 else: | |
| 500 return None | |
| 501 | |
| 502 | |
| 503 def ParseAtomicCodeNode(tokens): | |
| 504 def Pop(token_type=None): | |
| 505 return PopToken(tokens, token_type) | |
| 506 | |
| 507 head = PopFront(tokens) | |
| 508 t = head.token_type | |
| 509 if t == 'code': | |
| 510 return RawCodeNode(head) | |
| 511 elif t == '$var': | |
| 512 id_token = Pop('id') | |
| 513 Pop('=') | |
| 514 next = PeekToken(tokens) | |
| 515 if next.token_type == 'exp': | |
| 516 exp_token = Pop() | |
| 517 return VarNode(id_token, ParseExpNode(exp_token)) | |
| 518 Pop('[[') | |
| 519 code_node = ParseCodeNode(tokens) | |
| 520 Pop(']]') | |
| 521 return VarNode(id_token, code_node) | |
| 522 elif t == '$for': | |
| 523 id_token = Pop('id') | |
| 524 next_token = PeekToken(tokens) | |
| 525 if next_token.token_type == 'code': | |
| 526 sep_token = next_token | |
| 527 Pop('code') | |
| 528 else: | |
| 529 sep_token = None | |
| 530 Pop('[[') | |
| 531 code_node = ParseCodeNode(tokens) | |
| 532 Pop(']]') | |
| 533 return ForNode(id_token, sep_token, code_node) | |
| 534 elif t == '$if': | |
| 535 exp_token = Pop('code') | |
| 536 Pop('[[') | |
| 537 code_node = ParseCodeNode(tokens) | |
| 538 Pop(']]') | |
| 539 else_node = ParseElseNode(tokens) | |
| 540 return IfNode(ParseExpNode(exp_token), code_node, else_node) | |
| 541 elif t == '$range': | |
| 542 id_token = Pop('id') | |
| 543 exp1_token = Pop('exp') | |
| 544 Pop('..') | |
| 545 exp2_token = Pop('exp') | |
| 546 return RangeNode(id_token, ParseExpNode(exp1_token), | |
| 547 ParseExpNode(exp2_token)) | |
| 548 elif t == '$id': | |
| 549 return ParseExpNode(Token(head.start + 1, head.end, head.value[1:], 'id')) | |
| 550 elif t == '$($)': | |
| 551 return LiteralDollarNode(head) | |
| 552 elif t == '$': | |
| 553 exp_token = Pop('exp') | |
| 554 return ParseExpNode(exp_token) | |
| 555 elif t == '[[': | |
| 556 code_node = ParseCodeNode(tokens) | |
| 557 Pop(']]') | |
| 558 return code_node | |
| 559 else: | |
| 560 PushFront(tokens, head) | |
| 561 return None | |
| 562 | |
| 563 | |
| 564 def ParseCodeNode(tokens): | |
| 565 atomic_code_list = [] | |
| 566 while True: | |
| 567 if not tokens: | |
| 568 break | |
| 569 atomic_code_node = ParseAtomicCodeNode(tokens) | |
| 570 if atomic_code_node: | |
| 571 atomic_code_list.append(atomic_code_node) | |
| 572 else: | |
| 573 break | |
| 574 return CodeNode(atomic_code_list) | |
| 575 | |
| 576 | |
| 577 def ParseToAST(pump_src_text): | |
| 578 """Convert the given Pump source text into an AST.""" | |
| 579 tokens = list(Tokenize(pump_src_text)) | |
| 580 code_node = ParseCodeNode(tokens) | |
| 581 return code_node | |
| 582 | |
| 583 | |
| 584 class Env: | |
| 585 def __init__(self): | |
| 586 self.variables = [] | |
| 587 self.ranges = [] | |
| 588 | |
| 589 def Clone(self): | |
| 590 clone = Env() | |
| 591 clone.variables = self.variables[:] | |
| 592 clone.ranges = self.ranges[:] | |
| 593 return clone | |
| 594 | |
| 595 def PushVariable(self, var, value): | |
| 596 # If value looks like an int, store it as an int. | |
| 597 try: | |
| 598 int_value = int(value) | |
| 599 if ('%s' % int_value) == value: | |
| 600 value = int_value | |
| 601 except Exception: | |
| 602 pass | |
| 603 self.variables[:0] = [(var, value)] | |
| 604 | |
| 605 def PopVariable(self): | |
| 606 self.variables[:1] = [] | |
| 607 | |
| 608 def PushRange(self, var, lower, upper): | |
| 609 self.ranges[:0] = [(var, lower, upper)] | |
| 610 | |
| 611 def PopRange(self): | |
| 612 self.ranges[:1] = [] | |
| 613 | |
| 614 def GetValue(self, identifier): | |
| 615 for (var, value) in self.variables: | |
| 616 if identifier == var: | |
| 617 return value | |
| 618 | |
| 619 print 'ERROR: meta variable %s is undefined.' % (identifier,) | |
| 620 sys.exit(1) | |
| 621 | |
| 622 def EvalExp(self, exp): | |
| 623 try: | |
| 624 result = eval(exp.python_exp) | |
| 625 except Exception, e: | |
| 626 print 'ERROR: caught exception %s: %s' % (e.__class__.__name__, e) | |
| 627 print ('ERROR: failed to evaluate meta expression %s at %s' % | |
| 628 (exp.python_exp, exp.token.start)) | |
| 629 sys.exit(1) | |
| 630 return result | |
| 631 | |
| 632 def GetRange(self, identifier): | |
| 633 for (var, lower, upper) in self.ranges: | |
| 634 if identifier == var: | |
| 635 return (lower, upper) | |
| 636 | |
| 637 print 'ERROR: range %s is undefined.' % (identifier,) | |
| 638 sys.exit(1) | |
| 639 | |
| 640 | |
| 641 class Output: | |
| 642 def __init__(self): | |
| 643 self.string = '' | |
| 644 | |
| 645 def GetLastLine(self): | |
| 646 index = self.string.rfind('\n') | |
| 647 if index < 0: | |
| 648 return '' | |
| 649 | |
| 650 return self.string[index + 1:] | |
| 651 | |
| 652 def Append(self, s): | |
| 653 self.string += s | |
| 654 | |
| 655 | |
| 656 def RunAtomicCode(env, node, output): | |
| 657 if isinstance(node, VarNode): | |
| 658 identifier = node.identifier.value.strip() | |
| 659 result = Output() | |
| 660 RunAtomicCode(env.Clone(), node.atomic_code, result) | |
| 661 value = result.string | |
| 662 env.PushVariable(identifier, value) | |
| 663 elif isinstance(node, RangeNode): | |
| 664 identifier = node.identifier.value.strip() | |
| 665 lower = int(env.EvalExp(node.exp1)) | |
| 666 upper = int(env.EvalExp(node.exp2)) | |
| 667 env.PushRange(identifier, lower, upper) | |
| 668 elif isinstance(node, ForNode): | |
| 669 identifier = node.identifier.value.strip() | |
| 670 if node.sep is None: | |
| 671 sep = '' | |
| 672 else: | |
| 673 sep = node.sep.value | |
| 674 (lower, upper) = env.GetRange(identifier) | |
| 675 for i in range(lower, upper + 1): | |
| 676 new_env = env.Clone() | |
| 677 new_env.PushVariable(identifier, i) | |
| 678 RunCode(new_env, node.code, output) | |
| 679 if i != upper: | |
| 680 output.Append(sep) | |
| 681 elif isinstance(node, RawCodeNode): | |
| 682 output.Append(node.raw_code.value) | |
| 683 elif isinstance(node, IfNode): | |
| 684 cond = env.EvalExp(node.exp) | |
| 685 if cond: | |
| 686 RunCode(env.Clone(), node.then_branch, output) | |
| 687 elif node.else_branch is not None: | |
| 688 RunCode(env.Clone(), node.else_branch, output) | |
| 689 elif isinstance(node, ExpNode): | |
| 690 value = env.EvalExp(node) | |
| 691 output.Append('%s' % (value,)) | |
| 692 elif isinstance(node, LiteralDollarNode): | |
| 693 output.Append('$') | |
| 694 elif isinstance(node, CodeNode): | |
| 695 RunCode(env.Clone(), node, output) | |
| 696 else: | |
| 697 print 'BAD' | |
| 698 print node | |
| 699 sys.exit(1) | |
| 700 | |
| 701 | |
| 702 def RunCode(env, code_node, output): | |
| 703 for atomic_code in code_node.atomic_code: | |
| 704 RunAtomicCode(env, atomic_code, output) | |
| 705 | |
| 706 | |
| 707 def IsSingleLineComment(cur_line): | |
| 708 return '//' in cur_line | |
| 709 | |
| 710 | |
| 711 def IsInPreprocessorDirective(prev_lines, cur_line): | |
| 712 if cur_line.lstrip().startswith('#'): | |
| 713 return True | |
| 714 return prev_lines and prev_lines[-1].endswith('\\') | |
| 715 | |
| 716 | |
| 717 def WrapComment(line, output): | |
| 718 loc = line.find('//') | |
| 719 before_comment = line[:loc].rstrip() | |
| 720 if before_comment == '': | |
| 721 indent = loc | |
| 722 else: | |
| 723 output.append(before_comment) | |
| 724 indent = len(before_comment) - len(before_comment.lstrip()) | |
| 725 prefix = indent*' ' + '// ' | |
| 726 max_len = 80 - len(prefix) | |
| 727 comment = line[loc + 2:].strip() | |
| 728 segs = [seg for seg in re.split(r'(\w+\W*)', comment) if seg != ''] | |
| 729 cur_line = '' | |
| 730 for seg in segs: | |
| 731 if len((cur_line + seg).rstrip()) < max_len: | |
| 732 cur_line += seg | |
| 733 else: | |
| 734 if cur_line.strip() != '': | |
| 735 output.append(prefix + cur_line.rstrip()) | |
| 736 cur_line = seg.lstrip() | |
| 737 if cur_line.strip() != '': | |
| 738 output.append(prefix + cur_line.strip()) | |
| 739 | |
| 740 | |
| 741 def WrapCode(line, line_concat, output): | |
| 742 indent = len(line) - len(line.lstrip()) | |
| 743 prefix = indent*' ' # Prefix of the current line | |
| 744 max_len = 80 - indent - len(line_concat) # Maximum length of the current line | |
| 745 new_prefix = prefix + 4*' ' # Prefix of a continuation line | |
| 746 new_max_len = max_len - 4 # Maximum length of a continuation line | |
| 747 # Prefers to wrap a line after a ',' or ';'. | |
| 748 segs = [seg for seg in re.split(r'([^,;]+[,;]?)', line.strip()) if seg != ''] | |
| 749 cur_line = '' # The current line without leading spaces. | |
| 750 for seg in segs: | |
| 751 # If the line is still too long, wrap at a space. | |
| 752 while cur_line == '' and len(seg.strip()) > max_len: | |
| 753 seg = seg.lstrip() | |
| 754 split_at = seg.rfind(' ', 0, max_len) | |
| 755 output.append(prefix + seg[:split_at].strip() + line_concat) | |
| 756 seg = seg[split_at + 1:] | |
| 757 prefix = new_prefix | |
| 758 max_len = new_max_len | |
| 759 | |
| 760 if len((cur_line + seg).rstrip()) < max_len: | |
| 761 cur_line = (cur_line + seg).lstrip() | |
| 762 else: | |
| 763 output.append(prefix + cur_line.rstrip() + line_concat) | |
| 764 prefix = new_prefix | |
| 765 max_len = new_max_len | |
| 766 cur_line = seg.lstrip() | |
| 767 if cur_line.strip() != '': | |
| 768 output.append(prefix + cur_line.strip()) | |
| 769 | |
| 770 | |
| 771 def WrapPreprocessorDirective(line, output): | |
| 772 WrapCode(line, ' \\', output) | |
| 773 | |
| 774 | |
| 775 def WrapPlainCode(line, output): | |
| 776 WrapCode(line, '', output) | |
| 777 | |
| 778 | |
| 779 def IsMultiLineIWYUPragma(line): | |
| 780 return re.search(r'/\* IWYU pragma: ', line) | |
| 781 | |
| 782 | |
| 783 def IsHeaderGuardIncludeOrOneLineIWYUPragma(line): | |
| 784 return (re.match(r'^#(ifndef|define|endif\s*//)\s*[\w_]+\s*$', line) or | |
| 785 re.match(r'^#include\s', line) or | |
| 786 # Don't break IWYU pragmas, either; that causes iwyu.py problems. | |
| 787 re.search(r'// IWYU pragma: ', line)) | |
| 788 | |
| 789 | |
| 790 def WrapLongLine(line, output): | |
| 791 line = line.rstrip() | |
| 792 if len(line) <= 80: | |
| 793 output.append(line) | |
| 794 elif IsSingleLineComment(line): | |
| 795 if IsHeaderGuardIncludeOrOneLineIWYUPragma(line): | |
| 796 # The style guide made an exception to allow long header guard lines, | |
| 797 # includes and IWYU pragmas. | |
| 798 output.append(line) | |
| 799 else: | |
| 800 WrapComment(line, output) | |
| 801 elif IsInPreprocessorDirective(output, line): | |
| 802 if IsHeaderGuardIncludeOrOneLineIWYUPragma(line): | |
| 803 # The style guide made an exception to allow long header guard lines, | |
| 804 # includes and IWYU pragmas. | |
| 805 output.append(line) | |
| 806 else: | |
| 807 WrapPreprocessorDirective(line, output) | |
| 808 elif IsMultiLineIWYUPragma(line): | |
| 809 output.append(line) | |
| 810 else: | |
| 811 WrapPlainCode(line, output) | |
| 812 | |
| 813 | |
| 814 def BeautifyCode(string): | |
| 815 lines = string.splitlines() | |
| 816 output = [] | |
| 817 for line in lines: | |
| 818 WrapLongLine(line, output) | |
| 819 output2 = [line.rstrip() for line in output] | |
| 820 return '\n'.join(output2) + '\n' | |
| 821 | |
| 822 | |
| 823 def ConvertFromPumpSource(src_text): | |
| 824 """Return the text generated from the given Pump source text.""" | |
| 825 ast = ParseToAST(StripMetaComments(src_text)) | |
| 826 output = Output() | |
| 827 RunCode(Env(), ast, output) | |
| 828 return BeautifyCode(output.string) | |
| 829 | |
| 830 | |
| 831 def main(argv): | |
| 832 if len(argv) == 1: | |
| 833 print __doc__ | |
| 834 sys.exit(1) | |
| 835 | |
| 836 file_path = argv[-1] | |
| 837 output_str = ConvertFromPumpSource(file(file_path, 'r').read()) | |
| 838 if file_path.endswith('.pump'): | |
| 839 output_file_path = file_path[:-5] | |
| 840 else: | |
| 841 output_file_path = '-' | |
| 842 if output_file_path == '-': | |
| 843 print output_str, | |
| 844 else: | |
| 845 output_file = file(output_file_path, 'w') | |
| 846 output_file.write('// This file was GENERATED by command:\n') | |
| 847 output_file.write('// %s %s\n' % | |
| 848 (os.path.basename(__file__), os.path.basename(file_path))) | |
| 849 output_file.write('// DO NOT EDIT BY HAND!!!\n\n') | |
| 850 output_file.write(output_str) | |
| 851 output_file.close() | |
| 852 | |
| 853 | |
| 854 if __name__ == '__main__': | |
| 855 main(sys.argv) |
