sphinx / tests / etree13 / ElementTree.py

   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
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
#
# ElementTree
# $Id$
#
# light-weight XML support for Python 2.2 and later.
#
# history:
# 2001-10-20 fl   created (from various sources)
# 2001-11-01 fl   return root from parse method
# 2002-02-16 fl   sort attributes in lexical order
# 2002-04-06 fl   TreeBuilder refactoring, added PythonDoc markup
# 2002-05-01 fl   finished TreeBuilder refactoring
# 2002-07-14 fl   added basic namespace support to ElementTree.write
# 2002-07-25 fl   added QName attribute support
# 2002-10-20 fl   fixed encoding in write
# 2002-11-24 fl   changed default encoding to ascii; fixed attribute encoding
# 2002-11-27 fl   accept file objects or file names for parse/write
# 2002-12-04 fl   moved XMLTreeBuilder back to this module
# 2003-01-11 fl   fixed entity encoding glitch for us-ascii
# 2003-02-13 fl   added XML literal factory
# 2003-02-21 fl   added ProcessingInstruction/PI factory
# 2003-05-11 fl   added tostring/fromstring helpers
# 2003-05-26 fl   added ElementPath support
# 2003-07-05 fl   added makeelement factory method
# 2003-07-28 fl   added more well-known namespace prefixes
# 2003-08-15 fl   fixed typo in ElementTree.findtext (Thomas Dartsch)
# 2003-09-04 fl   fall back on emulator if ElementPath is not installed
# 2003-10-31 fl   markup updates
# 2003-11-15 fl   fixed nested namespace bug
# 2004-03-28 fl   added XMLID helper
# 2004-06-02 fl   added default support to findtext
# 2004-06-08 fl   fixed encoding of non-ascii element/attribute names
# 2004-08-23 fl   take advantage of post-2.1 expat features
# 2004-09-03 fl   made Element class visible; removed factory
# 2005-02-01 fl   added iterparse implementation
# 2005-03-02 fl   fixed iterparse support for pre-2.2 versions
# 2005-11-12 fl   added tostringlist/fromstringlist helpers
# 2006-07-05 fl   merged in selected changes from the 1.3 sandbox
# 2006-07-05 fl   removed support for 2.1 and earlier
# 2007-06-21 fl   added deprecation/future warnings
# 2007-08-25 fl   added doctype hook, added parser version attribute etc
# 2007-08-26 fl   added new serializer code (better namespace handling, etc)
# 2007-08-27 fl   warn for broken /tag searches on tree level
# 2007-09-02 fl   added html/text methods to serializer (experimental)
# 2007-09-05 fl   added method argument to tostring/tostringlist
# 2007-09-06 fl   improved error handling
#
# Copyright (c) 1999-2007 by Fredrik Lundh.  All rights reserved.
#
# fredrik@pythonware.com
# http://www.pythonware.com
#
# --------------------------------------------------------------------
# The ElementTree toolkit is
#
# Copyright (c) 1999-2007 by Fredrik Lundh
#
# By obtaining, using, and/or copying this software and/or its
# associated documentation, you agree that you have read, understood,
# and will comply with the following terms and conditions:
#
# Permission to use, copy, modify, and distribute this software and
# its associated documentation for any purpose and without fee is
# hereby granted, provided that the above copyright notice appears in
# all copies, and that both that copyright notice and this permission
# notice appear in supporting documentation, and that the name of
# Secret Labs AB or the author not be used in advertising or publicity
# pertaining to distribution of the software without specific, written
# prior permission.
#
# SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
# TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANT-
# ABILITY AND FITNESS.  IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR
# BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
# OF THIS SOFTWARE.
# --------------------------------------------------------------------

from __future__ import generators

__all__ = [
    # public symbols
    "Comment",
    "dump",
    "Element", "ElementTree",
    "fromstring", "fromstringlist",
    "iselement", "iterparse",
    "parse", "ParseError",
    "PI", "ProcessingInstruction",
    "QName",
    "SubElement",
    "tostring", "tostringlist",
    "TreeBuilder",
    "VERSION",
    "XML",
    "XMLParser", "XMLTreeBuilder",
    ]

##
# The <b>Element</b> type is a flexible container object, designed to
# store hierarchical data structures in memory. The type can be
# described as a cross between a list and a dictionary.
# <p>
# Each element has a number of properties associated with it:
# <ul>
# <li>a <i>tag</i>. This is a string identifying what kind of data
# this element represents (the element type, in other words).</li>
# <li>a number of <i>attributes</i>, stored in a Python dictionary.</li>
# <li>a <i>text</i> string.</li>
# <li>an optional <i>tail</i> string.</li>
# <li>a number of <i>child elements</i>, stored in a Python sequence</li>
# </ul>
#
# To create an element instance, use the {@link #Element} constructor
# or the {@link #SubElement} factory function.
# <p>
# The {@link #ElementTree} class can be used to wrap an element
# structure, and convert it from and to XML.
##

import sys, re

class _SimpleElementPath(object):
    # emulate pre-1.2 find/findtext/findall behaviour
    def find(self, element, tag):
        for elem in element:
            if elem.tag == tag:
                return elem
        return None
    def findtext(self, element, tag, default=None):
        for elem in element:
            if elem.tag == tag:
                return elem.text or ""
        return default
    def findall(self, element, tag):
        if tag[:3] == ".//":
            return element.getiterator(tag[3:])
        result = []
        for elem in element:
            if elem.tag == tag:
                result.append(elem)
        return result

try:
    import ElementPath
except ImportError:
    # FIXME: issue warning in this case?
    ElementPath = _SimpleElementPath()

VERSION = "1.3a2"

class ParseError(SyntaxError):
    pass

# --------------------------------------------------------------------

##
# Checks if an object appears to be a valid element object.
#
# @param An element instance.
# @return A true value if this is an element object.
# @defreturn flag

def iselement(element):
    # FIXME: not sure about this; might be a better idea to look
    # for tag/attrib/text attributes
    return isinstance(element, Element) or hasattr(element, "tag")

##
# Element class.  This class defines the Element interface, and
# provides a reference implementation of this interface.
# <p>
# The element name, attribute names, and attribute values can be
# either 8-bit ASCII strings or Unicode strings.
#
# @param tag The element name.
# @param attrib An optional dictionary, containing element attributes.
# @param **extra Additional attributes, given as keyword arguments.
# @see Element
# @see SubElement
# @see Comment
# @see ProcessingInstruction

class Element(object):
    # <tag attrib>text<child/>...</tag>tail

    ##
    # (Attribute) Element tag.

    tag = None

    ##
    # (Attribute) Element attribute dictionary.  Where possible, use
    # {@link #Element.get},
    # {@link #Element.set},
    # {@link #Element.keys}, and
    # {@link #Element.items} to access
    # element attributes.

    attrib = None

    ##
    # (Attribute) Text before first subelement.  This is either a
    # string or the value None, if there was no text.

    text = None

    ##
    # (Attribute) Text after this element's end tag, but before the
    # next sibling element's start tag.  This is either a string or
    # the value None, if there was no text.

    tail = None # text after end tag, if any

    def __init__(self, tag, attrib={}, **extra):
        attrib = attrib.copy()
        attrib.update(extra)
        self.tag = tag
        self.attrib = attrib
        self._children = []

    def __repr__(self):
        return "<Element %s at %x>" % (repr(self.tag), id(self))

    ##
    # Creates a new element object of the same type as this element.
    #
    # @param tag Element tag.
    # @param attrib Element attributes, given as a dictionary.
    # @return A new element instance.

    def makeelement(self, tag, attrib):
        return Element(tag, attrib)

    ##
    # Returns the number of subelements.
    #
    # @return The number of subelements.

    def __len__(self):
        return len(self._children)

    def __nonzero__(self):
        import warnings
        warnings.warn(
            "The behavior of this method will change in future versions. "
            "Use specific 'len(elem)' or 'elem is not None' test instead.",
            FutureWarning
            )
        return len(self._children) != 0 # emulate old behaviour

    ##
    # Returns the given subelement.
    #
    # @param index What subelement to return.
    # @return The given subelement.
    # @exception IndexError If the given element does not exist.

    def __getitem__(self, index):
        return self._children[index]

    ##
    # Replaces the given subelement.
    #
    # @param index What subelement to replace.
    # @param element The new element value.
    # @exception IndexError If the given element does not exist.
    # @exception AssertionError If element is not a valid object.

    def __setitem__(self, index, element):
        assert iselement(element)
        self._children[index] = element

    ##
    # Deletes the given subelement.
    #
    # @param index What subelement to delete.
    # @exception IndexError If the given element does not exist.

    def __delitem__(self, index):
        del self._children[index]

    ##
    # Returns a list containing subelements in the given range.
    #
    # @param start The first subelement to return.
    # @param stop The first subelement that shouldn't be returned.
    # @return A sequence object containing subelements.

    def __getslice__(self, start, stop):
        return self._children[start:stop]

    ##
    # Replaces a number of subelements with elements from a sequence.
    #
    # @param start The first subelement to replace.
    # @param stop The first subelement that shouldn't be replaced.
    # @param elements A sequence object with zero or more elements.
    # @exception AssertionError If a sequence member is not a valid object.

    def __setslice__(self, start, stop, elements):
        for element in elements:
            assert iselement(element)
        self._children[start:stop] = list(elements)

    ##
    # Deletes a number of subelements.
    #
    # @param start The first subelement to delete.
    # @param stop The first subelement to leave in there.

    def __delslice__(self, start, stop):
        del self._children[start:stop]

    ##
    # Adds a subelement to the end of this element.
    #
    # @param element The element to add.
    # @exception AssertionError If a sequence member is not a valid object.

    def append(self, element):
        assert iselement(element)
        self._children.append(element)

    ##
    # Appends subelements from a sequence.
    #
    # @param elements A sequence object with zero or more elements.
    # @exception AssertionError If a subelement is not a valid object.
    # @since 1.3

    def extend(self, elements):
        for element in elements:
            assert iselement(element)
        self._children.extend(elements)

    ##
    # Inserts a subelement at the given position in this element.
    #
    # @param index Where to insert the new subelement.
    # @exception AssertionError If the element is not a valid object.

    def insert(self, index, element):
        assert iselement(element)
        self._children.insert(index, element)

    ##
    # Removes a matching subelement.  Unlike the <b>find</b> methods,
    # this method compares elements based on identity, not on tag
    # value or contents.
    #
    # @param element What element to remove.
    # @exception ValueError If a matching element could not be found.
    # @exception AssertionError If the element is not a valid object.

    def remove(self, element):
        assert iselement(element)
        self._children.remove(element)

    ##
    # (Deprecated) Returns all subelements.  The elements are returned
    # in document order.
    #
    # @return A list of subelements.
    # @defreturn list of Element instances

    def getchildren(self):
        import warnings
        warnings.warn(
            "This method will be removed in future versions. "
            "Use 'list(elem)' or iteration over elem instead.",
            DeprecationWarning
            )
        return self._children

    ##
    # Finds the first matching subelement, by tag name or path.
    #
    # @param path What element to look for.
    # @return The first matching element, or None if no element was found.
    # @defreturn Element or None

    def find(self, path):
        return ElementPath.find(self, path)

    ##
    # Finds text for the first matching subelement, by tag name or path.
    #
    # @param path What element to look for.
    # @param default What to return if the element was not found.
    # @return The text content of the first matching element, or the
    #     default value no element was found.  Note that if the element
    #     has is found, but has no text content, this method returns an
    #     empty string.
    # @defreturn string

    def findtext(self, path, default=None):
        return ElementPath.findtext(self, path, default)

    ##
    # Finds all matching subelements, by tag name or path.
    #
    # @param path What element to look for.
    # @return A list or iterator containing all matching elements,
    #    in document order.
    # @defreturn list of Element instances

    def findall(self, path):
        return ElementPath.findall(self, path)

    ##
    # Resets an element.  This function removes all subelements, clears
    # all attributes, and sets the text and tail attributes to None.

    def clear(self):
        self.attrib.clear()
        self._children = []
        self.text = self.tail = None

    ##
    # Gets an element attribute.
    #
    # @param key What attribute to look for.
    # @param default What to return if the attribute was not found.
    # @return The attribute value, or the default value, if the
    #     attribute was not found.
    # @defreturn string or None

    def get(self, key, default=None):
        return self.attrib.get(key, default)

    ##
    # Sets an element attribute.
    #
    # @param key What attribute to set.
    # @param value The attribute value.

    def set(self, key, value):
        self.attrib[key] = value

    ##
    # Gets a list of attribute names.  The names are returned in an
    # arbitrary order (just like for an ordinary Python dictionary).
    #
    # @return A list of element attribute names.
    # @defreturn list of strings

    def keys(self):
        return self.attrib.keys()

    ##
    # Gets element attributes, as a sequence.  The attributes are
    # returned in an arbitrary order.
    #
    # @return A list of (name, value) tuples for all attributes.
    # @defreturn list of (string, string) tuples

    def items(self):
        return self.attrib.items()

    ##
    # Creates a tree iterator.  The iterator loops over this element
    # and all subelements, in document order, and returns all elements
    # with a matching tag.
    # <p>
    # If the tree structure is modified during iteration, new or removed
    # elements may or may not be included.  To get a stable set, use the
    # list() function on the iterator, and loop over the resulting list.
    #
    # @param tag What tags to look for (default is to return all elements).
    # @return An iterator containing all the matching elements.
    # @defreturn iterator

    def iter(self, tag=None):
        if tag == "*":
            tag = None
        if tag is None or self.tag == tag:
            yield self
        for e in self._children:
            for e in e.iter(tag):
                yield e

    # compatibility (FIXME: preserve list behaviour too? see below)
    getiterator = iter

    # def getiterator(self, tag=None):
    #     return list(tag)

    ##
    # Creates a text iterator.  The iterator loops over this element
    # and all subelements, in document order, and returns all inner
    # text.
    #
    # @return An iterator containing all inner text.
    # @defreturn iterator

    def itertext(self):
        if self.text:
            yield self.text
        for e in self:
            for s in e.itertext():
                yield s
            if e.tail:
                yield e.tail

# compatibility
_Element = _ElementInterface = Element

##
# Subelement factory.  This function creates an element instance, and
# appends it to an existing element.
# <p>
# The element name, attribute names, and attribute values can be
# either 8-bit ASCII strings or Unicode strings.
#
# @param parent The parent element.
# @param tag The subelement name.
# @param attrib An optional dictionary, containing element attributes.
# @param **extra Additional attributes, given as keyword arguments.
# @return An element instance.
# @defreturn Element

def SubElement(parent, tag, attrib={}, **extra):
    attrib = attrib.copy()
    attrib.update(extra)
    element = parent.makeelement(tag, attrib)
    parent.append(element)
    return element

##
# Comment element factory.  This factory function creates a special
# element that will be serialized as an XML comment by the standard
# serializer.
# <p>
# The comment string can be either an 8-bit ASCII string or a Unicode
# string.
#
# @param text A string containing the comment string.
# @return An element instance, representing a comment.
# @defreturn Element

def Comment(text=None):
    element = Element(Comment)
    element.text = text
    return element

##
# PI element factory.  This factory function creates a special element
# that will be serialized as an XML processing instruction by the standard
# serializer.
#
# @param target A string containing the PI target.
# @param text A string containing the PI contents, if any.
# @return An element instance, representing a PI.
# @defreturn Element

def ProcessingInstruction(target, text=None):
    element = Element(ProcessingInstruction)
    element.text = target
    if text:
        element.text = element.text + " " + text
    return element

PI = ProcessingInstruction

##
# QName wrapper.  This can be used to wrap a QName attribute value, in
# order to get proper namespace handling on output.
#
# @param text A string containing the QName value, in the form {uri}local,
#     or, if the tag argument is given, the URI part of a QName.
# @param tag Optional tag.  If given, the first argument is interpreted as
#     an URI, and this argument is interpreted as a local name.
# @return An opaque object, representing the QName.

class QName(object):
    def __init__(self, text_or_uri, tag=None):
        if tag:
            text_or_uri = "{%s}%s" % (text_or_uri, tag)
        self.text = text_or_uri
    def __str__(self):
        return self.text
    def __hash__(self):
        return hash(self.text)
    def __cmp__(self, other):
        if isinstance(other, QName):
            return cmp(self.text, other.text)
        return cmp(self.text, other)

# --------------------------------------------------------------------

##
# ElementTree wrapper class.  This class represents an entire element
# hierarchy, and adds some extra support for serialization to and from
# standard XML.
#
# @param element Optional root element.
# @keyparam file Optional file handle or file name.  If given, the
#     tree is initialized with the contents of this XML file.

class ElementTree(object):

    def __init__(self, element=None, file=None):
        assert element is None or iselement(element)
        self._root = element # first node
        if file:
            self.parse(file)

    ##
    # Gets the root element for this tree.
    #
    # @return An element instance.
    # @defreturn Element

    def getroot(self):
        return self._root

    ##
    # Replaces the root element for this tree.  This discards the
    # current contents of the tree, and replaces it with the given
    # element.  Use with care.
    #
    # @param element An element instance.

    def _setroot(self, element):
        assert iselement(element)
        self._root = element

    ##
    # Loads an external XML document into this element tree.
    #
    # @param source A file name or file object.
    # @keyparam parser An optional parser instance.  If not given, the
    #     standard {@link XMLParser} parser is used.
    # @return The document root element.
    # @defreturn Element

    def parse(self, source, parser=None):
        if not hasattr(source, "read"):
            source = open(source, "rb")
        if not parser:
            parser = XMLParser(target=TreeBuilder())
        while 1:
            data = source.read(32768)
            if not data:
                break
            parser.feed(data)
        self._root = parser.close()
        return self._root

    ##
    # Creates a tree iterator for the root element.  The iterator loops
    # over all elements in this tree, in document order.
    #
    # @param tag What tags to look for (default is to return all elements)
    # @return An iterator.
    # @defreturn iterator

    def iter(self, tag=None):
        assert self._root is not None
        return self._root.iter(tag)

    getiterator = iter

    ##
    # Finds the first toplevel element with given tag.
    # Same as getroot().find(path).
    #
    # @param path What element to look for.
    # @return The first matching element, or None if no element was found.
    # @defreturn Element or None

    def find(self, path):
        assert self._root is not None
        if path[:1] == "/":
            path = "." + path
            import warnings
            warnings.warn(
                "This search is broken in 1.3 and earlier; if you rely "
                "on the current behaviour, change it to %r" % path,
                FutureWarning
                )
        return self._root.find(path)

    ##
    # Finds the element text for the first toplevel element with given
    # tag.  Same as getroot().findtext(path).
    #
    # @param path What toplevel element to look for.
    # @param default What to return if the element was not found.
    # @return The text content of the first matching element, or the
    #     default value no element was found.  Note that if the element
    #     has is found, but has no text content, this method returns an
    #     empty string.
    # @defreturn string

    def findtext(self, path, default=None):
        assert self._root is not None
        if path[:1] == "/":
            path = "." + path
            import warnings
            warnings.warn(
                "This search is broken in 1.3 and earlier; if you rely "
                "on the current behaviour, change it to %r" % path,
                FutureWarning
                )
        return self._root.findtext(path, default)

    ##
    # Finds all toplevel elements with the given tag.
    # Same as getroot().findall(path).
    #
    # @param path What element to look for.
    # @return A list or iterator containing all matching elements,
    #    in document order.
    # @defreturn list of Element instances

    def findall(self, path):
        assert self._root is not None
        if path[:1] == "/":
            path = "." + path
            import warnings
            warnings.warn(
                "This search is broken in 1.3 and earlier; if you rely "
                "on the current behaviour, change it to %r" % path,
                FutureWarning
                )
        return self._root.findall(path)

    ##
    # Writes the element tree to a file, as XML.
    #
    # @param file A file name, or a file object opened for writing.
    # @keyparam encoding Optional output encoding (default is US-ASCII).
    # @keyparam method Optional output method ("xml" or "html"; default
    #     is "xml".
    # @keyparam xml_declaration Controls if an XML declaration should
    #     be added to the file.  Use False for never, True for always,
    #     None for only if not US-ASCII or UTF-8.  None is default.

    def write(self, file,
              # keyword arguments
              encoding="us-ascii",
              xml_declaration=None,
              default_namespace=None,
              method=None):
        assert self._root is not None
        if not hasattr(file, "write"):
            file = open(file, "wb")
        write = file.write
        if not method:
            method = "xml"
        if not encoding:
            encoding = "us-ascii"
        elif xml_declaration or (xml_declaration is None and
                                 encoding not in ("utf-8", "us-ascii")):
            write("<?xml version='1.0' encoding='%s'?>\n" % encoding)
        if method == "text":
            _serialize_text(write, self._root, encoding)
        else:
            qnames, namespaces = _namespaces(
                self._root, encoding, default_namespace
                )
            if method == "xml":
                _serialize_xml(
                    write, self._root, encoding, qnames, namespaces
                    )
            elif method == "html":
                _serialize_html(
                    write, self._root, encoding, qnames, namespaces
                    )
            else:
                raise ValueError("unknown method %r" % method)

# --------------------------------------------------------------------
# serialization support

def _namespaces(elem, encoding, default_namespace=None):
    # identify namespaces used in this tree

    # maps qnames to *encoded* prefix:local names
    qnames = {None: None}

    # maps uri:s to prefixes
    namespaces = {}
    if default_namespace:
        namespaces[default_namespace] = ""

    def encode(text):
        return text.encode(encoding)

    def add_qname(qname):
        # calculate serialized qname representation
        try:
            if qname[:1] == "{":
                uri, tag = qname[1:].split("}", 1)
                prefix = namespaces.get(uri)
                if prefix is None:
                    prefix = _namespace_map.get(uri)
                    if prefix is None:
                        prefix = "ns%d" % len(namespaces)
                    if prefix != "xml":
                        namespaces[uri] = prefix
                if prefix:
                    qnames[qname] = encode("%s:%s" % (prefix, tag))
                else:
                    qnames[qname] = encode(tag) # default element
            else:
                if default_namespace:
                    # FIXME: can this be handled in XML 1.0?
                    raise ValueError(
                        "cannot use non-qualified names with "
                        "default_namespace option"
                        )
                qnames[qname] = encode(qname)
        except TypeError:
            _raise_serialization_error(qname)

    # populate qname and namespaces table
    try:
        iterate = elem.iter
    except AttributeError:
        iterate = elem.getiterator # cET compatibility
    for elem in iterate():
        tag = elem.tag
        if isinstance(tag, QName) and tag.text not in qnames:
            add_qname(tag.text)
        elif isinstance(tag, basestring):
            if tag not in qnames:
                add_qname(tag)
        elif tag is not None and tag is not Comment and tag is not PI:
            _raise_serialization_error(tag)
        for key, value in elem.items():
            if isinstance(key, QName):
                key = key.text
            if key not in qnames:
                add_qname(key)
            if isinstance(value, QName) and value.text not in qnames:
                add_qname(value.text)
        text = elem.text
        if isinstance(text, QName) and text.text not in qnames:
            add_qname(text.text)
    return qnames, namespaces

def _serialize_xml(write, elem, encoding, qnames, namespaces):
    tag = elem.tag
    text = elem.text
    if tag is Comment:
        write("<!--%s-->" % _escape_cdata(text, encoding))
    elif tag is ProcessingInstruction:
        write("<?%s?>" % _escape_cdata(text, encoding))
    else:
        tag = qnames[tag]
        if tag is None:
            if text:
                write(_escape_cdata(text, encoding))
            for e in elem:
                _serialize_xml(write, e, encoding, qnames, None)
        else:
            write("<" + tag)
            items = elem.items()
            if items or namespaces:
                items.sort() # lexical order
                for k, v in items:
                    if isinstance(k, QName):
                        k = k.text
                    if isinstance(v, QName):
                        v = qnames[v.text]
                    else:
                        v = _escape_attrib(v, encoding)
                    write(" %s=\"%s\"" % (qnames[k], v))
                if namespaces:
                    items = namespaces.items()
                    items.sort(key=lambda x: x[1]) # sort on prefix
                    for v, k in items:
                        if k:
                            k = ":" + k
                        write(" xmlns%s=\"%s\"" % (
                            k.encode(encoding),
                            _escape_attrib(v, encoding)
                            ))
            if text or len(elem):
                write(">")
                if text:
                    write(_escape_cdata(text, encoding))
                for e in elem:
                    _serialize_xml(write, e, encoding, qnames, None)
                write("</" + tag + ">")
            else:
                write(" />")
    if elem.tail:
        write(_escape_cdata(elem.tail, encoding))

HTML_EMPTY = ("area", "base", "basefont", "br", "col", "frame", "hr",
              "img", "input", "isindex", "link", "meta" "param")

try:
    HTML_EMPTY = set(HTML_EMPTY)
except NameError:
    pass

def _serialize_html(write, elem, encoding, qnames, namespaces):
    tag = elem.tag
    text = elem.text
    if tag is Comment:
        write("<!--%s-->" % _escape_cdata(text, encoding))
    elif tag is ProcessingInstruction:
        write("<?%s?>" % _escape_cdata(text, encoding))
    else:
        tag = qnames[tag]
        if tag is None:
            if text:
                write(_escape_cdata(text, encoding))
            for e in elem:
                _serialize_html(write, e, encoding, qnames, None)
        else:
            write("<" + tag)
            items = elem.items()
            if items or namespaces:
                items.sort() # lexical order
                for k, v in items:
                    if isinstance(k, QName):
                        k = k.text
                    if isinstance(v, QName):
                        v = qnames[v.text]
                    else:
                        v = _escape_attrib_html(v, encoding)
                    # FIXME: handle boolean attributes
                    write(" %s=\"%s\"" % (qnames[k], v))
                if namespaces:
                    items = namespaces.items()
                    items.sort(key=lambda x: x[1]) # sort on prefix
                    for v, k in items:
                        if k:
                            k = ":" + k
                        write(" xmlns%s=\"%s\"" % (
                            k.encode(encoding),
                            _escape_attrib(v, encoding)
                            ))
            write(">")
            tag = tag.lower()
            if text:
                if tag == "script" or tag == "style":
                    write(_encode(text, encoding))
                else:
                    write(_escape_cdata(text, encoding))
            for e in elem:
                _serialize_html(write, e, encoding, qnames, None)
            if tag not in HTML_EMPTY:
                write("</" + tag + ">")
    if elem.tail:
        write(_escape_cdata(elem.tail, encoding))

def _serialize_text(write, elem, encoding):
    for part in elem.itertext():
        write(part.encode(encoding))
    if elem.tail:
        write(elem.tail.encode(encoding))

##
# Registers a namespace prefix.  The registry is global, and any
# existing mapping for either the given prefix or the namespace URI
# will be removed.
#
# @param prefix Namespace prefix.
# @param uri Namespace uri.  Tags and attributes in this namespace
#     will be serialized with the given prefix, if at all possible.
# @raise ValueError If the prefix is reserved, or is otherwise
#     invalid.

def register_namespace(prefix, uri):
    if re.match("ns\d+$", prefix):
        raise ValueError("Prefix format reserved for internal use")
    for k, v in _namespace_map.items():
        if k == uri or v == prefix:
            del _namespace_map[k]
    _namespace_map[uri] = prefix

_namespace_map = {
    # "well-known" namespace prefixes
    "http://www.w3.org/XML/1998/namespace": "xml",
    "http://www.w3.org/1999/xhtml": "html",
    "http://www.w3.org/1999/02/22-rdf-syntax-ns#": "rdf",
    "http://schemas.xmlsoap.org/wsdl/": "wsdl",
    # xml schema
    "http://www.w3.org/2001/XMLSchema": "xs",
    "http://www.w3.org/2001/XMLSchema-instance": "xsi",
    # dublic core
    "http://purl.org/dc/elements/1.1/": "dc",
}

def _raise_serialization_error(text):
    raise TypeError(
        "cannot serialize %r (type %s)" % (text, type(text).__name__)
        )

def _encode(text, encoding):
    try:
        return text.encode(encoding, "xmlcharrefreplace")
    except (TypeError, AttributeError):
        _raise_serialization_error(text)

def _escape_cdata(text, encoding):
    # escape character data
    try:
        # it's worth avoiding do-nothing calls for strings that are
        # shorter than 500 character, or so.  assume that's, by far,
        # the most common case in most applications.
        if "&" in text:
            text = text.replace("&", "&amp;")
        if "<" in text:
            text = text.replace("<", "&lt;")
        if ">" in text:
            text = text.replace(">", "&gt;")
        return text.encode(encoding, "xmlcharrefreplace")
    except (TypeError, AttributeError):
        _raise_serialization_error(text)

def _escape_attrib(text, encoding):
    # escape attribute value
    try:
        if "&" in text:
            text = text.replace("&", "&amp;")
        if "<" in text:
            text = text.replace("<", "&lt;")
        if ">" in text:
            text = text.replace(">", "&gt;")
        if "\"" in text:
            text = text.replace("\"", "&quot;")
        if "\n" in text:
            text = text.replace("\n", "&#10;")
        return text.encode(encoding, "xmlcharrefreplace")
    except (TypeError, AttributeError):
        _raise_serialization_error(text)

def _escape_attrib_html(text, encoding):
    # escape attribute value
    try:
        if "&" in text:
            text = text.replace("&", "&amp;")
        if ">" in text:
            text = text.replace(">", "&gt;")
        if "\"" in text:
            text = text.replace("\"", "&quot;")
        return text.encode(encoding, "xmlcharrefreplace")
    except (TypeError, AttributeError):
        _raise_serialization_error(text)

# --------------------------------------------------------------------

##
# Generates a string representation of an XML element, including all
# subelements.
#
# @param element An Element instance.
# @return An encoded string containing the XML data.
# @defreturn string

def tostring(element, encoding=None, method=None):
    class dummy:
        pass
    data = []
    file = dummy()
    file.write = data.append
    ElementTree(element).write(file, encoding, method=method)
    return "".join(data)

##
# Generates a string representation of an XML element, including all
# subelements.  The string is returned as a sequence of string fragments.
#
# @param element An Element instance.
# @return A sequence object containing the XML data.
# @defreturn sequence
# @since 1.3

def tostringlist(element, encoding=None):
    class dummy:
        pass
    data = []
    file = dummy()
    file.write = data.append
    ElementTree(element).write(file, encoding)
    # FIXME: merge small fragments into larger parts
    return data

##
# Writes an element tree or element structure to sys.stdout.  This
# function should be used for debugging only.
# <p>
# The exact output format is implementation dependent.  In this
# version, it's written as an ordinary XML file.
#
# @param elem An element tree or an individual element.

def dump(elem):
    # debugging
    if not isinstance(elem, ElementTree):
        elem = ElementTree(elem)
    elem.write(sys.stdout)
    tail = elem.getroot().tail
    if not tail or tail[-1] != "\n":
        sys.stdout.write("\n")

# --------------------------------------------------------------------
# parsing

##
# Parses an XML document into an element tree.
#
# @param source A filename or file object containing XML data.
# @param parser An optional parser instance.  If not given, the
#     standard {@link XMLParser} parser is used.
# @return An ElementTree instance

def parse(source, parser=None):
    tree = ElementTree()
    tree.parse(source, parser)
    return tree

##
# Parses an XML document into an element tree incrementally, and reports
# what's going on to the user.
#
# @param source A filename or file object containing XML data.
# @param events A list of events to report back.  If omitted, only "end"
#     events are reported.
# @param parser An optional parser instance.  If not given, the
#     standard {@link XMLParser} parser is used.
# @return A (event, elem) iterator.

def iterparse(source, events=None, parser=None):
    if not hasattr(source, "read"):
        source = open(source, "rb")
    if not parser:
        parser = XMLParser(target=TreeBuilder())
    return _IterParseIterator(source, events, parser)

class _IterParseIterator(object):

    def __init__(self, source, events, parser):
        self._file = source
        self._events = []
        self._index = 0
        self.root = self._root = None
        self._parser = parser
        # wire up the parser for event reporting
        parser = self._parser._parser
        append = self._events.append
        if events is None:
            events = ["end"]
        for event in events:
            if event == "start":
                try:
                    parser.ordered_attributes = 1
                    parser.specified_attributes = 1
                    def handler(tag, attrib_in, event=event, append=append,
                                start=self._parser._start_list):
                        append((event, start(tag, attrib_in)))
                    parser.StartElementHandler = handler
                except AttributeError:
                    def handler(tag, attrib_in, event=event, append=append,
                                start=self._parser._start):
                        append((event, start(tag, attrib_in)))
                    parser.StartElementHandler = handler
            elif event == "end":
                def handler(tag, event=event, append=append,
                            end=self._parser._end):
                    append((event, end(tag)))
                parser.EndElementHandler = handler
            elif event == "start-ns":
                def handler(prefix, uri, event=event, append=append):
                    try:
                        uri = uri.encode("ascii")
                    except UnicodeError:
                        pass
                    append((event, (prefix or "", uri)))
                parser.StartNamespaceDeclHandler = handler
            elif event == "end-ns":
                def handler(prefix, event=event, append=append):
                    append((event, None))
                parser.EndNamespaceDeclHandler = handler

    def next(self):
        while 1:
            try:
                item = self._events[self._index]
            except IndexError:
                if self._parser is None:
                    self.root = self._root
                    raise StopIteration
                # load event buffer
                del self._events[:]
                self._index = 0
                data = self._file.read(16384)
                if data:
                    self._parser.feed(data)
                else:
                    self._root = self._parser.close()
                    self._parser = None
            else:
                self._index = self._index + 1
                return item

    def __iter__(self):
        return self

##
# Parses an XML document from a string constant.  This function can
# be used to embed "XML literals" in Python code.
#
# @param source A string containing XML data.
# @param parser An optional parser instance.  If not given, the
#     standard {@link XMLParser} parser is used.
# @return An Element instance.
# @defreturn Element

def XML(text, parser=None):
    if not parser:
        parser = XMLParser(target=TreeBuilder())
    parser.feed(text)
    return parser.close()

##
# Parses an XML document from a string constant, and also returns
# a dictionary which maps from element id:s to elements.
#
# @param source A string containing XML data.
# @param parser An optional parser instance.  If not given, the
#     standard {@link XMLParser} parser is used.
# @return A tuple containing an Element instance and a dictionary.
# @defreturn (Element, dictionary)

def XMLID(text, parser=None):
    if not parser:
        parser = XMLParser(target=TreeBuilder())
    parser.feed(text)
    tree = parser.close()
    ids = {}
    for elem in tree.getiterator():
        id = elem.get("id")
        if id:
            ids[id] = elem
    return tree, ids

##
# Parses an XML document from a string constant.  Same as {@link #XML}.
#
# @def fromstring(text)
# @param source A string containing XML data.
# @return An Element instance.
# @defreturn Element

fromstring = XML

##
# Parses an XML document from a sequence of string fragments.
#
# @param sequence A list or other sequence containing XML data fragments.
# @param parser An optional parser instance.  If not given, the
#     standard {@link XMLParser} parser is used.
# @return An Element instance.
# @defreturn Element
# @since 1.3

def fromstringlist(sequence, parser=None):
    if not parser:
        parser = XMLParser(target=TreeBuilder())
    for text in sequence:
        parser.feed(text)
    return parser.close()

# --------------------------------------------------------------------

##
# Generic element structure builder.  This builder converts a sequence
# of {@link #TreeBuilder.start}, {@link #TreeBuilder.data}, and {@link
# #TreeBuilder.end} method calls to a well-formed element structure.
# <p>
# You can use this class to build an element structure using a custom XML
# parser, or a parser for some other XML-like format.
#
# @param element_factory Optional element factory.  This factory
#    is called to create new Element instances, as necessary.

class TreeBuilder(object):

    def __init__(self, element_factory=None):
        self._data = [] # data collector
        self._elem = [] # element stack
        self._last = None # last element
        self._tail = None # true if we're after an end tag
        if element_factory is None:
            element_factory = Element
        self._factory = element_factory

    ##
    # Flushes the builder buffers, and returns the toplevel document
    # element.
    #
    # @return An Element instance.
    # @defreturn Element

    def close(self):
        assert len(self._elem) == 0, "missing end tags"
        assert self._last != None, "missing toplevel element"
        return self._last

    def _flush(self):
        if self._data:
            if self._last is not None:
                text = "".join(self._data)
                if self._tail:
                    assert self._last.tail is None, "internal error (tail)"
                    self._last.tail = text
                else:
                    assert self._last.text is None, "internal error (text)"
                    self._last.text = text
            self._data = []

    ##
    # Adds text to the current element.
    #
    # @param data A string.  This should be either an 8-bit string
    #    containing ASCII text, or a Unicode string.

    def data(self, data):
        self._data.append(data)

    ##
    # Opens a new element.
    #
    # @param tag The element name.
    # @param attrib A dictionary containing element attributes.
    # @return The opened element.
    # @defreturn Element

    def start(self, tag, attrs):
        self._flush()
        self._last = elem = self._factory(tag, attrs)
        if self._elem:
            self._elem[-1].append(elem)
        self._elem.append(elem)
        self._tail = 0
        return elem

    ##
    # Closes the current element.
    #
    # @param tag The element name.
    # @return The closed element.
    # @defreturn Element

    def end(self, tag):
        self._flush()
        self._last = self._elem.pop()
        assert self._last.tag == tag,\
               "end tag mismatch (expected %s, got %s)" % (
                   self._last.tag, tag)
        self._tail = 1
        return self._last

##
# Element structure builder for XML source data, based on the
# <b>expat</b> parser.
#
# @keyparam target Target object.  If omitted, the builder uses an
#     instance of the standard {@link #TreeBuilder} class.
# @keyparam html Predefine HTML entities.  This flag is not supported
#     by the current implementation.
# @keyparam encoding Optional encoding.  If given, the value overrides
#     the encoding specified in the XML file.
# @see #ElementTree
# @see #TreeBuilder

class XMLParser(object):

    def __init__(self, html=0, target=None, encoding=None):
        try:
            from xml.parsers import expat
        except ImportError:
            try:
                import pyexpat; expat = pyexpat
            except ImportError:
                raise ImportError(
                    "No module named expat; use SimpleXMLTreeBuilder instead"
                    )
        parser = expat.ParserCreate(encoding, "}")
        if target is None:
            target = TreeBuilder()
        # underscored names are provided for compatibility only
        self.parser = self._parser = parser
        self.target = self._target = target
        self._error = expat.error
        self._names = {} # name memo cache
        # callbacks
        parser.DefaultHandlerExpand = self._default
        parser.StartElementHandler = self._start
        parser.EndElementHandler = self._end
        parser.CharacterDataHandler = self._data
        # let expat do the buffering, if supported
        try:
            self._parser.buffer_text = 1
        except AttributeError:
            pass
        # use new-style attribute handling, if supported
        try:
            self._parser.ordered_attributes = 1
            self._parser.specified_attributes = 1
            parser.StartElementHandler = self._start_list
        except AttributeError:
            pass
        self._doctype = None
        self.entity = {}
        try:
            self.version = "Expat %d.%d.%d" % expat.version_info
        except AttributeError:
            pass # unknown

    def _raiseerror(self, value):
        err = ParseError(value)
        err.code = value.code
        err.position = value.lineno, value.offset
        raise err

    def _fixtext(self, text):
        # convert text string to ascii, if possible
        try:
            return text.encode("ascii")
        except UnicodeError:
            return text

    def _fixname(self, key):
        # expand qname, and convert name string to ascii, if possible
        try:
            name = self._names[key]
        except KeyError:
            name = key
            if "}" in name:
                name = "{" + name
            self._names[key] = name = self._fixtext(name)
        return name

    def _start(self, tag, attrib_in):
        fixname = self._fixname
        fixtext = self._fixtext
        tag = fixname(tag)
        attrib = {}
        for key, value in attrib_in.items():
            attrib[fixname(key)] = fixtext(value)
        return self.target.start(tag, attrib)

    def _start_list(self, tag, attrib_in):
        fixname = self._fixname
        fixtext = self._fixtext
        tag = fixname(tag)
        attrib = {}
        if attrib_in:
            for i in range(0, len(attrib_in), 2):
                attrib[fixname(attrib_in[i])] = fixtext(attrib_in[i+1])
        return self.target.start(tag, attrib)

    def _data(self, text):
        return self.target.data(self._fixtext(text))

    def _end(self, tag):
        return self.target.end(self._fixname(tag))

    def _default(self, text):
        prefix = text[:1]
        if prefix == "&":
            # deal with undefined entities
            try:
                self.target.data(self.entity[text[1:-1]])
            except KeyError:
                from xml.parsers import expat
                err = expat.error(
                    "undefined entity %s: line %d, column %d" %
                    (text, self._parser.ErrorLineNumber,
                    self._parser.ErrorColumnNumber)
                    )
                err.code = 11 # XML_ERROR_UNDEFINED_ENTITY
                err.lineno = self._parser.ErrorLineNumber
                err.offset = self._parser.ErrorColumnNumber
                raise err
        elif prefix == "<" and text[:9] == "<!DOCTYPE":
            self._doctype = [] # inside a doctype declaration
        elif self._doctype is not None:
            # parse doctype contents
            if prefix == ">":
                self._doctype = None
                return
            text = text.strip()
            if not text:
                return
            self._doctype.append(text)
            n = len(self._doctype)
            if n > 2:
                type = self._doctype[1]
                if type == "PUBLIC" and n == 4:
                    name, type, pubid, system = self._doctype
                elif type == "SYSTEM" and n == 3:
                    name, type, system = self._doctype
                    pubid = None
                else:
                    return
                if pubid:
                    pubid = pubid[1:-1]
                if hasattr(self.target, "doctype"):
                    self.target.doctype(name, pubid, system[1:-1])
                self._doctype = None

    ##
    # Feeds data to the parser.
    #
    # @param data Encoded data.

    def feed(self, data):
        try:
            self._parser.Parse(data, 0)
        except self._error, v:
            self._raiseerror(v)

    ##
    # Finishes feeding data to the parser.
    #
    # @return An element structure.
    # @defreturn Element

    def close(self):
        try:
            self._parser.Parse("", 1) # end of data
        except self._error, v:
            self._raiseerror(v)
        tree = self.target.close()
        del self.target, self._parser # get rid of circular references
        return tree

# compatibility
XMLTreeBuilder = XMLParser
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for ProjectModifiedEvent.java.
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.