Source

cedit / iniparse / ini.py

Full commit
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
"""Access and/or modify INI files

* Compatiable with ConfigParser
* Preserves order of sections & options
* Preserves comments/blank lines/etc
* More conveninet access to data

Example:

    >>> from StringIO import StringIO
    >>> sio = StringIO('''# configure foo-application
    ... [foo]
    ... bar1 = qualia
    ... bar2 = 1977
    ... [foo-ext]
    ... special = 1''')

    >>> cfg = INIConfig(sio)
    >>> print cfg.foo.bar1
    qualia
    >>> print cfg['foo-ext'].special
    1
    >>> cfg.foo.newopt = 'hi!'

    >>> print cfg
    # configure foo-application
    [foo]
    bar1 = qualia
    bar2 = 1977
    newopt = hi!
    [foo-ext]
    special = 1

"""

# An ini parser that supports ordered sections/options
# Also supports updates, while preserving structure
# Backward-compatiable with ConfigParser

import re
from ConfigParser import DEFAULTSECT, ParsingError, MissingSectionHeaderError

import config

class LineType(object):
    line = None

    def __init__(self, line=None):
        if line is not None:
            self.line = line.strip('\n')

    # Return the original line for unmodified objects
    # Otherwise construct using the current attribute values
    def __str__(self):
        if self.line is not None:
            return self.line
        else:
            return self.to_string()

    # If an attribute is modified after initialization
    # set line to None since it is no longer accurate.
    def __setattr__(self, name, value):
        if hasattr(self,name):
            self.__dict__['line'] = None
        self.__dict__[name] = value

    def to_string(self):
        raise Exception('This method must be overridden in derived classes')


class SectionLine(LineType):
    regex =  re.compile(r'^\['
                        r'(?P<name>[^]]+)'
                        r'\]\s*'
                        r'((?P<csep>;|#)(?P<comment>.*))?$')

    def __init__(self, name, comment=None, comment_separator=None,
                             comment_offset=-1, line=None):
        super(SectionLine, self).__init__(line)
        self.name = name
        self.comment = comment
        self.comment_separator = comment_separator
        self.comment_offset = comment_offset

    def to_string(self):
        out = '[' + self.name + ']'
        if self.comment is not None:
            # try to preserve indentation of comments
            out = (out+' ').ljust(self.comment_offset)
            out = out + self.comment_separator + self.comment
        return out

    def parse(cls, line):
        m = cls.regex.match(line.rstrip())
        if m is None:
            return None
        return cls(m.group('name'), m.group('comment'),
                   m.group('csep'), m.start('csep'),
                   line)
    parse = classmethod(parse)


class OptionLine(LineType):
    def __init__(self, name, value, separator=' = ', comment=None,
                 comment_separator=None, comment_offset=-1, line=None):
        super(OptionLine, self).__init__(line)
        self.name = name
        self.value = value
        self.separator = separator
        self.comment = comment
        self.comment_separator = comment_separator
        self.comment_offset = comment_offset

    def to_string(self):
        out = '%s%s%s' % (self.name, self.separator, self.value)
        if self.comment is not None:
            # try to preserve indentation of comments
            out = (out+' ').ljust(self.comment_offset)
            out = out + self.comment_separator + self.comment
        return out

    regex = re.compile(r'^(?P<name>[^:=\s[][^:=]*)'
                       r'(?P<sep>[:=]\s*)'
                       r'(?P<value>.*)$')

    def parse(cls, line):
        m = cls.regex.match(line.rstrip())
        if m is None:
            return None

        name = m.group('name').rstrip()
        value = m.group('value')
        sep = m.group('name')[len(name):] + m.group('sep')

        # comments are not detected in the regex because
        # ensuring total compatibility with ConfigParser
        # requires that:
        #     option = value    ;comment   // value=='value'
        #     option = value;1  ;comment   // value=='value;1  ;comment'
        #
        # Doing this in a regex would be complicated.  I
        # think this is a bug.  The whole issue of how to
        # include ';' in the value needs to be addressed.
        # Also, '#' doesn't mark comments in options...

        coff = value.find(';')
        if coff != -1 and value[coff-1].isspace():
            comment = value[coff+1:]
            csep = value[coff]
            value = value[:coff].rstrip()
            coff = m.start('value') + coff
        else:
            comment = None
            csep = None
            coff = -1

        return cls(name, value, sep, comment, csep, coff, line)
    parse = classmethod(parse)


class CommentLine(LineType):
    regex = re.compile(r'^(?P<csep>[;#]|[rR][eE][mM])'
                       r'(?P<comment>.*)$')

    def __init__(self, comment='', separator='#', line=None):
        super(CommentLine, self).__init__(line)
        self.comment = comment
        self.separator = separator

    def to_string(self):
        return self.separator + self.comment

    def parse(cls, line):
        m = cls.regex.match(line.rstrip())
        if m is None:
            return None
        return cls(m.group('comment'), m.group('csep'), line)
    parse = classmethod(parse)


class EmptyLine(LineType):
    # could make this a singleton
    def to_string(self):
        return ''

    value = property(lambda _: '')

    def parse(cls, line):
        if line.strip(): return None
        return cls(line)
    parse = classmethod(parse)


class ContinuationLine(LineType):
    regex = re.compile(r'^\s+(?P<value>.*)$')

    def __init__(self, value, value_offset=None, line=None):
        super(ContinuationLine, self).__init__(line)
        self.value = value
        if value_offset is None:
            value_offset = 8
        self.value_offset = value_offset

    def to_string(self):
        return ' '*self.value_offset + self.value

    def parse(cls, line):
        m = cls.regex.match(line.rstrip())
        if m is None:
            return None
        return cls(m.group('value'), m.start('value'), line)
    parse = classmethod(parse)


class LineContainer(object):
    def __init__(self, d=None):
        self.contents = []
        self.orgvalue = None
        if d:
            if isinstance(d, list): self.extend(d)
            else: self.add(d)

    def add(self, x):
        self.contents.append(x)

    def extend(self, x):
        for i in x: self.add(i)

    def get_name(self):
        return self.contents[0].name

    def set_name(self, data):
        self.contents[0].name = data

    def get_value(self):
        if self.orgvalue is not None:
            return self.orgvalue
        elif len(self.contents) == 1:
            return self.contents[0].value
        else:
            return '\n'.join([('%s' % x.value) for x in self.contents
                              if not isinstance(x, CommentLine)])
                              
    def add_empty(self):
        self.add(EmptyLine())

    def set_value(self, data):
        self.orgvalue = data
        lines = ('%s' % data).split('\n')

        # If there is an existing ContinuationLine, use its offset
        value_offset = None
        for v in self.contents:
            if isinstance(v, ContinuationLine):
                value_offset = v.value_offset
                break

        # Rebuild contents list, preserving initial OptionLine
        self.contents = self.contents[0:1]
        self.contents[0].value = lines[0]
        del lines[0]
        for line in lines:
            if line.strip():
                self.add(ContinuationLine(line, value_offset))
            else:
                self.add(EmptyLine())

    name = property(get_name, set_name)
    value = property(get_value, set_value)

    def __str__(self):
        s = [x.__str__() for x in self.contents]
        return '\n'.join(s)

    def finditer(self, key):
        for x in self.contents[::-1]:
            if hasattr(x, 'name') and x.name==key:
                yield x

    def find(self, key):
        for x in self.finditer(key):
            return x
        raise KeyError(key)


def _make_xform_property(myattrname, srcattrname=None):
    private_attrname = myattrname + 'value'
    private_srcname = myattrname + 'source'
    if srcattrname is None:
        srcattrname = myattrname

    def getfn(self):
        srcobj = getattr(self, private_srcname)
        if srcobj is not None:
            return getattr(srcobj, srcattrname)
        else:
            return getattr(self, private_attrname)

    def setfn(self, value):
        srcobj = getattr(self, private_srcname)
        if srcobj is not None:
            setattr(srcobj, srcattrname, value)
        else:
            setattr(self, private_attrname, value)

    return property(getfn, setfn)


class INISection(config.ConfigNamespace):
    _lines = None
    _options = None
    _defaults = None
    _optionxformvalue = None
    _optionxformsource = None
    _compat_skip_empty_lines = set()
    def __init__(self, lineobj, defaults = None,
                       optionxformvalue=None, optionxformsource=None):
        self._lines = [lineobj]
        self._defaults = defaults
        self._optionxformvalue = optionxformvalue
        self._optionxformsource = optionxformsource
        self._options = {}

    _optionxform = _make_xform_property('_optionxform')

    def _compat_get(self, key):
        # identical to __getitem__ except that _compat_XXX
        # is checked for backward-compatible handling
        if key == '__name__':
            return self._lines[-1].name
        if self._optionxform: key = self._optionxform(key)
        try:
            value = self._options[key].value
            del_empty = key in self._compat_skip_empty_lines
        except KeyError:
            if self._defaults and key in self._defaults._options:
                value = self._defaults._options[key].value
                del_empty = key in self._defaults._compat_skip_empty_lines
            else:
                raise
        if del_empty:
            value = re.sub('\n+', '\n', value)
        return value

    def __getitem__(self, key):
        if key == '__name__':
            return self._lines[-1].name
        if self._optionxform: key = self._optionxform(key)
        try:
            return self._options[key].value
        except KeyError:
            if self._defaults and key in self._defaults._options:
                return self._defaults._options[key].value
            else:
                raise

    def __setitem__(self, key, value):
        if self._optionxform: xkey = self._optionxform(key)
        else: xkey = key
        if xkey in self._compat_skip_empty_lines:
            self._compat_skip_empty_lines.remove(xkey)
        if xkey not in self._options:
            # create a dummy object - value may have multiple lines
            obj = LineContainer(OptionLine(key, ''))
            self._lines[-1].add(obj)
            self._options[xkey] = obj
        # the set_value() function in LineContainer
        # automatically handles multi-line values
        self._options[xkey].value = value

    def __delitem__(self, key):
        if self._optionxform: key = self._optionxform(key)
        if key in self._compat_skip_empty_lines:
            self._compat_skip_empty_lines.remove(key)
        for l in self._lines:
            remaining = []
            for o in l.contents:
                if isinstance(o, LineContainer):
                    n = o.name
                    if self._optionxform: n = self._optionxform(n)
                    if key != n: remaining.append(o)
                else:
                    remaining.append(o)
            l.contents = remaining
        del self._options[key]

    def __iter__(self):
        d = set()
        for l in self._lines:
            for x in l.contents:
                if isinstance(x, LineContainer):
                    if self._optionxform:
                        ans = self._optionxform(x.name)
                    else:
                        ans = x.name
                    if ans not in d:
                        yield ans
                        d.add(ans)
        if self._defaults:
            for x in self._defaults:
                if x not in d:
                    yield x
                    d.add(x)

    def _new_namespace(self, name):
        raise Exception('No sub-sections allowed', name)


def make_comment(line):
    return CommentLine(line.rstrip('\n'))


def readline_iterator(f):
    """iterate over a file by only using the file object's readline method"""

    have_newline = False
    while True:
        line = f.readline()

        if not line:
            if have_newline:
                yield ""
            return

        if line.endswith('\n'):
            have_newline = True
        else:
            have_newline = False

        yield line


def lower(x):
    return x.lower()


class INIConfig(config.ConfigNamespace):
    _data = None
    _sections = None
    _defaults = None
    _optionxformvalue = None
    _optionxformsource = None
    _sectionxformvalue = None
    _sectionxformsource = None
    _parse_exc = None
    _bom = False
    def __init__(self, fp=None, defaults=None, parse_exc=True,
                 optionxformvalue=lower, optionxformsource=None,
                 sectionxformvalue=None, sectionxformsource=None):
        self._data = LineContainer()
        self._parse_exc = parse_exc
        self._optionxformvalue = optionxformvalue
        self._optionxformsource = optionxformsource
        self._sectionxformvalue = sectionxformvalue
        self._sectionxformsource = sectionxformsource
        self._sections = {}
        if defaults is None: defaults = {}
        self._defaults = INISection(LineContainer(), optionxformsource=self)
        for name, value in defaults.iteritems():
            self._defaults[name] = value
        if fp is not None:
            self._readfp(fp)

    _optionxform = _make_xform_property('_optionxform', 'optionxform')
    _sectionxform = _make_xform_property('_sectionxform', 'optionxform')

    def __getitem__(self, key):
        if key == DEFAULTSECT:
            return self._defaults
        if self._sectionxform: key = self._sectionxform(key)
        return self._sections[key]

    def __setitem__(self, key, value):
        raise Exception('Values must be inside sections', key, value)

    def __delitem__(self, key):
        if self._sectionxform: key = self._sectionxform(key)
        for line in self._sections[key]._lines:
            self._data.contents.remove(line)
        del self._sections[key]

    def __iter__(self):
        d = set()
        d.add(DEFAULTSECT)
        for x in self._data.contents:
            if isinstance(x, LineContainer):
                if x.name not in d:
                    yield x.name
                    d.add(x.name)
                    
    def clean_format(self):
        ''' 
        this functions makes the configuration look
        clean and handwritten - two consecutive EmptyLines are removed,
        and one is guaranteed to be at the end of the file
        '''
        cont = self._data.contents
        if (len(cont) > 1):
            for i in range(1, len(cont)):
                if i > len(cont)-1:
                    break
                while isinstance(cont[i-1], EmptyLine) and isinstance(cont[i], EmptyLine):
                    cont.remove(cont[i])
                    if i > len(cont)-1:
                        break
        if cont and not isinstance(cont[len(cont) - 1], EmptyLine):
            self._data.add(EmptyLine())
    

    def _new_namespace(self, name):
        if self._data.contents:
            self._data.add(EmptyLine())
        obj = LineContainer(SectionLine(name))
        self._data.add(obj)
        self._data.add(EmptyLine())
        if self._sectionxform: name = self._sectionxform(name)
        if name in self._sections:
            ns = self._sections[name]
            ns._lines.append(obj)
        else:
            ns = INISection(obj, defaults=self._defaults,
                            optionxformsource=self)
            self._sections[name] = ns
        return ns

    def __str__(self):
        if self._bom:
            fmt = u'\ufeff%s'
        else:
            fmt = '%s'
        return fmt % self._data.__str__()

    __unicode__ = __str__

    _line_types = [EmptyLine, CommentLine,
                   SectionLine, OptionLine,
                   ContinuationLine]

    def _parse(self, line):
        for linetype in self._line_types:
            lineobj = linetype.parse(line)
            if lineobj:
                return lineobj
        else:
            # can't parse line
            return None

    def _readfp(self, fp):
        cur_section = None
        cur_option = None
        cur_section_name = None
        cur_option_name = None
        pending_lines = []
        pending_empty_lines = False
        try:
            fname = fp.name
        except AttributeError:
            fname = '<???>'
        linecount = 0
        exc = None
        line = None

        for line in readline_iterator(fp):
            # Check for BOM on first line
            if linecount == 0 and isinstance(line, unicode):
                if line[0] == u'\ufeff':
                    line = line[1:]
                    self._bom = True

            lineobj = self._parse(line)
            linecount += 1

            if not cur_section and not isinstance(lineobj,
                                (CommentLine, EmptyLine, SectionLine)):
                if self._parse_exc:
                    raise MissingSectionHeaderError(fname, linecount, line)
                else:
                    lineobj = make_comment(line)

            if lineobj is None:
                if self._parse_exc:
                    if exc is None: exc = ParsingError(fname)
                    exc.append(linecount, line)
                lineobj = make_comment(line)

            if isinstance(lineobj, ContinuationLine):
                if cur_option:
                    if pending_lines:
                        cur_option.extend(pending_lines)
                        pending_lines = []
                        if pending_empty_lines:
                            optobj._compat_skip_empty_lines.add(cur_option_name)
                            pending_empty_lines = False
                    cur_option.add(lineobj)
                else:
                    # illegal continuation line - convert to comment
                    if self._parse_exc:
                        if exc is None: exc = ParsingError(fname)
                        exc.append(linecount, line)
                    lineobj = make_comment(line)

            if isinstance(lineobj, OptionLine):
                if pending_lines:
                    cur_section.extend(pending_lines)
                    pending_lines = []
                    pending_empty_lines = False
                cur_option = LineContainer(lineobj)
                cur_section.add(cur_option)
                if self._optionxform:
                    cur_option_name = self._optionxform(cur_option.name)
                else:
                    cur_option_name = cur_option.name
                if cur_section_name == DEFAULTSECT:
                    optobj = self._defaults
                else:
                    optobj = self._sections[cur_section_name]
                optobj._options[cur_option_name] = cur_option

            if isinstance(lineobj, SectionLine):
                self._data.extend(pending_lines)
                pending_lines = []
                pending_empty_lines = False
                cur_section = LineContainer(lineobj)
                self._data.add(cur_section)
                cur_option = None
                cur_option_name = None
                if cur_section.name == DEFAULTSECT:
                    self._defaults._lines.append(cur_section)
                    cur_section_name = DEFAULTSECT
                else:
                    if self._sectionxform:
                        cur_section_name = self._sectionxform(cur_section.name)
                    else:
                        cur_section_name = cur_section.name
                    if cur_section_name not in self._sections:
                        self._sections[cur_section_name] = \
                                INISection(cur_section, defaults=self._defaults,
                                           optionxformsource=self)
                    else:
                        self._sections[cur_section_name]._lines.append(cur_section)

            if isinstance(lineobj, (CommentLine, EmptyLine)):
                pending_lines.append(lineobj)
                if isinstance(lineobj, EmptyLine):
                    pending_empty_lines = True

        self._data.extend(pending_lines)
        if line and line[-1]=='\n':
            self._data.add(EmptyLine())

        if exc:
            raise exc