source: gtest-1.7.0/scripts/pump.py

Last change on this file was 12746, checked in by hock@…, 11 years ago

integrated the Google Testing Framework (gtest)

and wrote an Hello World test, to ensure the framework is working..

  • Property svn:executable set to *
File size: 23.1 KB
Line 
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
34A tool for preprocessor meta programming. Useful for generating
35repetitive boilerplate code. Especially useful for writing C++
36classes, functions, macros, and templates that need to work with
37various number of arguments.
38
39USAGE:
40 pump.py SOURCE_FILE
41
42EXAMPLES:
43 pump.py foo.cc.pump
44 Converts foo.cc.pump to foo.cc.
45
46GRAMMAR:
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 | $elif EXPRESSION [[ CODE ]] ELSE_BRANCH
61 | EMPTY
62 EXPRESSION has Python syntax.
63"""
64
65__author__ = 'wan@google.com (Zhanyong Wan)'
66
67import os
68import re
69import sys
70
71
72TOKEN_TABLE = [
73 (re.compile(r'\$var\s+'), '$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
87class 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.
132def Eof():
133 """Returns the special cursor to denote the end-of-file."""
134 return Cursor(-1, -1)
135
136
137class 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
163def 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
169def 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
186def 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
208def 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
226def 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
237def 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
243def 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
253ID_REGEX = re.compile(r'[_A-Za-z]\w*')
254EQ_REGEX = re.compile(r'=')
255REST_OF_LINE_REGEX = re.compile(r'.*?(?=$|\$\$)')
256OPTIONAL_WHITE_SPACES_REGEX = re.compile(r'\s*')
257WHITE_SPACE_REGEX = re.compile(r'\s')
258DOT_DOT_REGEX = re.compile(r'\.\.')
259
260
261def 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
270def 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
281def 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
303def 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
310def 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
382def 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
390class CodeNode:
391 def __init__(self, atomic_code_list=None):
392 self.atomic_code = atomic_code_list
393
394
395class VarNode:
396 def __init__(self, identifier=None, atomic_code=None):
397 self.identifier = identifier
398 self.atomic_code = atomic_code
399
400
401class 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
408class 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
415class ElseNode:
416 def __init__(self, else_branch=None):
417 self.else_branch = else_branch
418
419
420class 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
427class RawCodeNode:
428 def __init__(self, token=None):
429 self.raw_code = token
430
431
432class LiteralDollarNode:
433 def __init__(self, token):
434 self.token = token
435
436
437class ExpNode:
438 def __init__(self, token, python_exp):
439 self.token = token
440 self.python_exp = python_exp
441
442
443def PopFront(a_list):
444 head = a_list[0]
445 a_list[:1] = []
446 return head
447
448
449def PushFront(a_list, elem):
450 a_list[:0] = [elem]
451
452
453def 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
463def PeekToken(a_list):
464 if not a_list:
465 return None
466
467 return a_list[0]
468
469
470def 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
475def 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('$elif')
490 exp = Pop('code')
491 Pop('[[')
492 code_node = ParseCodeNode(tokens)
493 Pop(']]')
494 inner_else_node = ParseElseNode(tokens)
495 return CodeNode([IfNode(ParseExpNode(exp), code_node, inner_else_node)])
496 elif not next.value.strip():
497 Pop('code')
498 return ParseElseNode(tokens)
499 else:
500 return None
501
502
503def ParseAtomicCodeNode(tokens):
504 def Pop(token_type=None):
505 return PopToken(tokens, token_type)
506
507 head = PopFront(tokens)
508 t = head.token_type
509 if t == 'code':
510 return RawCodeNode(head)
511 elif t == '$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
564def 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
577def 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
584class 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
641class 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
656def 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
702def RunCode(env, code_node, output):
703 for atomic_code in code_node.atomic_code:
704 RunAtomicCode(env, atomic_code, output)
705
706
707def IsSingleLineComment(cur_line):
708 return '//' in cur_line
709
710
711def 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
717def 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
741def 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
771def WrapPreprocessorDirective(line, output):
772 WrapCode(line, ' \\', output)
773
774
775def WrapPlainCode(line, output):
776 WrapCode(line, '', output)
777
778
779def IsMultiLineIWYUPragma(line):
780 return re.search(r'/\* IWYU pragma: ', line)
781
782
783def 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
790def 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
814def 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
823def 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
831def 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
854if __name__ == '__main__':
855 main(sys.argv)
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