/usr/share/pyshared/Cheetah/Template.py is in python-cheetah 2.4.4-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 | '''
Provides the core API for Cheetah.
See the docstring in the Template class and the Users' Guide for more information
'''
################################################################################
## DEPENDENCIES
import sys # used in the error handling code
import re # used to define the internal delims regex
import logging
import string
import os.path
import time # used in the cache refresh code
from random import randrange
import imp
import inspect
import StringIO
import traceback
import pprint
import cgi # Used by .webInput() if the template is a CGI script.
import types
try:
from threading import Lock
except ImportError:
class Lock:
def acquire(self):
pass
def release(self):
pass
filetype = None
if isinstance(sys.version_info[:], tuple):
# Python 2.xx
filetype = types.FileType
def createMethod(func, cls):
return types.MethodType(func, None, cls)
else:
import io
filetype = io.IOBase
def createMethod(func, cls):
return types.MethodType(func, cls)
from Cheetah.Version import convertVersionStringToTuple, MinCompatibleVersionTuple
from Cheetah.Version import MinCompatibleVersion
# Base classes for Template
from Cheetah.Servlet import Servlet
# More intra-package imports ...
from Cheetah.Parser import ParseError, SourceReader
from Cheetah.Compiler import Compiler, DEFAULT_COMPILER_SETTINGS
from Cheetah import ErrorCatchers # for placeholder tags
from Cheetah import Filters # the output filters
from Cheetah.convertTmplPathToModuleName import convertTmplPathToModuleName
from Cheetah.Utils.Misc import checkKeywords # Used in Template.__init__
from Cheetah.Utils.Indenter import Indenter # Used in Template.__init__ and for
# placeholders
from Cheetah.NameMapper import NotFound, valueFromSearchList
from Cheetah.CacheStore import MemoryCacheStore, MemcachedCacheStore
from Cheetah.CacheRegion import CacheRegion
from Cheetah.Utils.WebInputMixin import _Converter, _lookup, NonNumericInputError
from Cheetah.Unspecified import Unspecified
# Decide whether to use the file modification time in file's cache key
__checkFileMtime = True
def checkFileMtime(value):
globals()['__checkFileMtime'] = value
class Error(Exception):
pass
class PreprocessError(Error):
pass
def hashList(l):
hashedList = []
for v in l:
if isinstance(v, dict):
v = hashDict(v)
elif isinstance(v, list):
v = hashList(v)
hashedList.append(v)
return hash(tuple(hashedList))
def hashDict(d):
items = sorted(d.items())
hashedList = []
for k, v in items:
if isinstance(v, dict):
v = hashDict(v)
elif isinstance(v, list):
v = hashList(v)
hashedList.append((k, v))
return hash(tuple(hashedList))
################################################################################
## MODULE GLOBALS AND CONSTANTS
def _genUniqueModuleName(baseModuleName):
"""The calling code is responsible for concurrency locking.
"""
if baseModuleName not in sys.modules:
finalName = baseModuleName
else:
finalName = ('cheetah_%s_%s_%s'%(baseModuleName,
str(time.time()).replace('.', '_'),
str(randrange(10000, 99999))))
return finalName
# Cache of a cgi.FieldStorage() instance, maintained by .webInput().
# This is only relavent to templates used as CGI scripts.
_formUsedByWebInput = None
def updateLinecache(filename, src):
import linecache
size = len(src)
mtime = time.time()
lines = src.splitlines()
fullname = filename
linecache.cache[filename] = size, mtime, lines, fullname
class CompileCacheItem(object):
pass
class TemplatePreprocessor(object):
'''
This is used with the preprocessors argument to Template.compile().
See the docstring for Template.compile
** Preprocessors are an advanced topic **
'''
def __init__(self, settings):
self._settings = settings
def preprocess(self, source, file):
"""Create an intermediate template and return the source code
it outputs
"""
settings = self._settings
if not source: # @@TR: this needs improving
if isinstance(file, (str, unicode)): # it's a filename.
f = open(file)
source = f.read()
f.close()
elif hasattr(file, 'read'):
source = file.read()
file = None
templateAPIClass = settings.templateAPIClass
possibleKwArgs = [
arg for arg in
inspect.getargs(templateAPIClass.compile.im_func.func_code)[0]
if arg not in ('klass', 'source', 'file',)]
compileKwArgs = {}
for arg in possibleKwArgs:
if hasattr(settings, arg):
compileKwArgs[arg] = getattr(settings, arg)
tmplClass = templateAPIClass.compile(source=source, file=file, **compileKwArgs)
tmplInstance = tmplClass(**settings.templateInitArgs)
outputSource = settings.outputTransformer(tmplInstance)
outputFile = None
return outputSource, outputFile
class Template(Servlet):
'''
This class provides a) methods used by templates at runtime and b)
methods for compiling Cheetah source code into template classes.
This documentation assumes you already know Python and the basics of object
oriented programming. If you don't know Python, see the sections of the
Cheetah Users' Guide for non-programmers. It also assumes you have read
about Cheetah's syntax in the Users' Guide.
The following explains how to use Cheetah from within Python programs or via
the interpreter. If you statically compile your templates on the command
line using the 'cheetah' script, this is not relevant to you. Statically
compiled Cheetah template modules/classes (e.g. myTemplate.py:
MyTemplateClasss) are just like any other Python module or class. Also note,
most Python web frameworks (Webware, Aquarium, mod_python, Turbogears,
CherryPy, Quixote, etc.) provide plugins that handle Cheetah compilation for
you.
There are several possible usage patterns:
1) tclass = Template.compile(src)
t1 = tclass() # or tclass(namespaces=[namespace,...])
t2 = tclass() # or tclass(namespaces=[namespace2,...])
outputStr = str(t1) # or outputStr = t1.aMethodYouDefined()
Template.compile provides a rich and very flexible API via its
optional arguments so there are many possible variations of this
pattern. One example is:
tclass = Template.compile('hello $name from $caller', baseclass=dict)
print tclass(name='world', caller='me')
See the Template.compile() docstring for more details.
2) tmplInstance = Template(src)
# or Template(src, namespaces=[namespace,...])
outputStr = str(tmplInstance) # or outputStr = tmplInstance.aMethodYouDefined(...args...)
Notes on the usage patterns:
usage pattern 1)
This is the most flexible, but it is slightly more verbose unless you
write a wrapper function to hide the plumbing. Under the hood, all
other usage patterns are based on this approach. Templates compiled
this way can #extend (subclass) any Python baseclass: old-style or
new-style (based on object or a builtin type).
usage pattern 2)
This was Cheetah's original usage pattern. It returns an instance,
but you can still access the generated class via
tmplInstance.__class__. If you want to use several different
namespace 'searchLists' with a single template source definition,
you're better off with Template.compile (1).
Limitations (use pattern 1 instead):
- Templates compiled this way can only #extend subclasses of the
new-style 'object' baseclass. Cheetah.Template is a subclass of
'object'. You also can not #extend dict, list, or other builtin
types.
- If your template baseclass' __init__ constructor expects args there
is currently no way to pass them in.
If you need to subclass a dynamically compiled Cheetah class, do something like this:
from Cheetah.Template import Template
T1 = Template.compile('$meth1 #def meth1: this is meth1 in T1')
T2 = Template.compile('#implements meth1\nthis is meth1 redefined in T2', baseclass=T1)
print T1, T1()
print T2, T2()
Note about class and instance attribute names:
Attributes used by Cheetah have a special prefix to avoid confusion with
the attributes of the templates themselves or those of template
baseclasses.
Class attributes which are used in class methods look like this:
klass._CHEETAH_useCompilationCache (_CHEETAH_xxx)
Instance attributes look like this:
klass._CHEETAH__globalSetVars (_CHEETAH__xxx with 2 underscores)
'''
# this is used by ._addCheetahPlumbingCodeToClass()
_CHEETAH_requiredCheetahMethods = (
'_initCheetahInstance',
'searchList',
'errorCatcher',
'getVar',
'varExists',
'getFileContents',
'i18n',
'runAsMainProgram',
'respond',
'shutdown',
'webInput',
'serverSidePath',
'generatedClassCode',
'generatedModuleCode',
'_getCacheStore',
'_getCacheStoreIdPrefix',
'_createCacheRegion',
'getCacheRegion',
'getCacheRegions',
'refreshCache',
'_handleCheetahInclude',
'_getTemplateAPIClassForIncludeDirectiveCompilation',
)
_CHEETAH_requiredCheetahClassMethods = ('subclass',)
_CHEETAH_requiredCheetahClassAttributes = ('cacheRegionClass', 'cacheStore',
'cacheStoreIdPrefix', 'cacheStoreClass')
## the following are used by .compile(). Most are documented in its docstring.
_CHEETAH_cacheModuleFilesForTracebacks = False
_CHEETAH_cacheDirForModuleFiles = None # change to a dirname
_CHEETAH_compileCache = dict() # cache store for compiled code and classes
# To do something other than simple in-memory caching you can create an
# alternative cache store. It just needs to support the basics of Python's
# mapping/dict protocol. E.g.:
# class AdvCachingTemplate(Template):
# _CHEETAH_compileCache = MemoryOrFileCache()
_CHEETAH_compileLock = Lock() # used to prevent race conditions
_CHEETAH_defaultMainMethodName = None
_CHEETAH_compilerSettings = None
_CHEETAH_compilerClass = Compiler
_CHEETAH_compilerInstance = None
_CHEETAH_cacheCompilationResults = True
_CHEETAH_useCompilationCache = True
_CHEETAH_keepRefToGeneratedCode = True
_CHEETAH_defaultBaseclassForTemplates = None
_CHEETAH_defaultClassNameForTemplates = None
# defaults to DEFAULT_COMPILER_SETTINGS['mainMethodName']:
_CHEETAH_defaultMainMethodNameForTemplates = None
_CHEETAH_defaultModuleNameForTemplates = 'DynamicallyCompiledCheetahTemplate'
_CHEETAH_defaultModuleGlobalsForTemplates = None
_CHEETAH_preprocessors = None
_CHEETAH_defaultPreprocessorClass = TemplatePreprocessor
## The following attributes are used by instance methods:
_CHEETAH_generatedModuleCode = None
NonNumericInputError = NonNumericInputError
_CHEETAH_cacheRegionClass = CacheRegion
_CHEETAH_cacheStoreClass = MemoryCacheStore
#_CHEETAH_cacheStoreClass = MemcachedCacheStore
_CHEETAH_cacheStore = None
_CHEETAH_cacheStoreIdPrefix = None
@classmethod
def _getCompilerClass(klass, source=None, file=None):
return klass._CHEETAH_compilerClass
@classmethod
def _getCompilerSettings(klass, source=None, file=None):
return klass._CHEETAH_compilerSettings
@classmethod
def compile(klass, source=None, file=None,
returnAClass=True,
compilerSettings=Unspecified,
compilerClass=Unspecified,
moduleName=None,
className=Unspecified,
mainMethodName=Unspecified,
baseclass=Unspecified,
moduleGlobals=Unspecified,
cacheCompilationResults=Unspecified,
useCache=Unspecified,
preprocessors=Unspecified,
cacheModuleFilesForTracebacks=Unspecified,
cacheDirForModuleFiles=Unspecified,
commandlineopts=None,
keepRefToGeneratedCode=Unspecified,
):
"""
The core API for compiling Cheetah source code into template classes.
This class method compiles Cheetah source code and returns a python
class. You then create template instances using that class. All
Cheetah's other compilation API's use this method under the hood.
Internally, this method a) parses the Cheetah source code and generates
Python code defining a module with a single class in it, b) dynamically
creates a module object with a unique name, c) execs the generated code
in that module's namespace then inserts the module into sys.modules, and
d) returns a reference to the generated class. If you want to get the
generated python source code instead, pass the argument
returnAClass=False.
It caches generated code and classes. See the descriptions of the
arguments'cacheCompilationResults' and 'useCache' for details. This
doesn't mean that templates will automatically recompile themselves when
the source file changes. Rather, if you call Template.compile(src) or
Template.compile(file=path) repeatedly it will attempt to return a
cached class definition instead of recompiling.
Hooks are provided template source preprocessing. See the notes on the
'preprocessors' arg.
If you are an advanced user and need to customize the way Cheetah parses
source code or outputs Python code, you should check out the
compilerSettings argument.
Arguments:
You must provide either a 'source' or 'file' arg, but not both:
- source (string or None)
- file (string path, file-like object, or None)
The rest of the arguments are strictly optional. All but the first
have defaults in attributes of the Template class which can be
overridden in subclasses of this class. Working with most of these is
an advanced topic.
- returnAClass=True
If false, return the generated module code rather than a class.
- compilerSettings (a dict)
Default: Template._CHEETAH_compilerSettings=None
a dictionary of settings to override those defined in
DEFAULT_COMPILER_SETTINGS. These can also be overridden in your
template source code with the #compiler or #compiler-settings
directives.
- compilerClass (a class)
Default: Template._CHEETAH_compilerClass=Cheetah.Compiler.Compiler
a subclass of Cheetah.Compiler.Compiler. Mucking with this is a
very advanced topic.
- moduleName (a string)
Default:
Template._CHEETAH_defaultModuleNameForTemplates
='DynamicallyCompiledCheetahTemplate'
What to name the generated Python module. If the provided value is
None and a file arg was given, the moduleName is created from the
file path. In all cases if the moduleName provided is already in
sys.modules it is passed through a filter that generates a unique
variant of the name.
- className (a string)
Default: Template._CHEETAH_defaultClassNameForTemplates=None
What to name the generated Python class. If the provided value is
None, the moduleName is use as the class name.
- mainMethodName (a string)
Default:
Template._CHEETAH_defaultMainMethodNameForTemplates
=None (and thus DEFAULT_COMPILER_SETTINGS['mainMethodName'])
What to name the main output generating method in the compiled
template class.
- baseclass (a string or a class)
Default: Template._CHEETAH_defaultBaseclassForTemplates=None
Specifies the baseclass for the template without manually
including an #extends directive in the source. The #extends
directive trumps this arg.
If the provided value is a string you must make sure that a class
reference by that name is available to your template, either by
using an #import directive or by providing it in the arg
'moduleGlobals'.
If the provided value is a class, Cheetah will handle all the
details for you.
- moduleGlobals (a dict)
Default: Template._CHEETAH_defaultModuleGlobalsForTemplates=None
A dict of vars that will be added to the global namespace of the
module the generated code is executed in, prior to the execution
of that code. This should be Python values, not code strings!
- cacheCompilationResults (True/False)
Default: Template._CHEETAH_cacheCompilationResults=True
Tells Cheetah to cache the generated code and classes so that they
can be reused if Template.compile() is called multiple times with
the same source and options.
- useCache (True/False)
Default: Template._CHEETAH_useCompilationCache=True
Should the compilation cache be used? If True and a previous
compilation created a cached template class with the same source
code, compiler settings and other options, the cached template
class will be returned.
- cacheModuleFilesForTracebacks (True/False)
Default: Template._CHEETAH_cacheModuleFilesForTracebacks=False
In earlier versions of Cheetah tracebacks from exceptions that
were raised inside dynamically compiled Cheetah templates were
opaque because Python didn't have access to a python source file
to use in the traceback:
File "xxxx.py", line 192, in getTextiledContent
content = str(template(searchList=searchList))
File "cheetah_yyyy.py", line 202, in __str__
File "cheetah_yyyy.py", line 187, in respond
File "cheetah_yyyy.py", line 139, in writeBody
ZeroDivisionError: integer division or modulo by zero
It is now possible to keep those files in a cache dir and allow
Python to include the actual source lines in tracebacks and makes
them much easier to understand:
File "xxxx.py", line 192, in getTextiledContent
content = str(template(searchList=searchList))
File "/tmp/CheetahCacheDir/cheetah_yyyy.py", line 202, in __str__
def __str__(self): return self.respond()
File "/tmp/CheetahCacheDir/cheetah_yyyy.py", line 187, in respond
self.writeBody(trans=trans)
File "/tmp/CheetahCacheDir/cheetah_yyyy.py", line 139, in writeBody
__v = 0/0 # $(0/0)
ZeroDivisionError: integer division or modulo by zero
- cacheDirForModuleFiles (a string representing a dir path)
Default: Template._CHEETAH_cacheDirForModuleFiles=None
See notes on cacheModuleFilesForTracebacks.
- preprocessors
Default: Template._CHEETAH_preprocessors=None
** THIS IS A VERY ADVANCED TOPIC **
These are used to transform the source code prior to compilation.
They provide a way to use Cheetah as a code generator for Cheetah
code. In other words, you use one Cheetah template to output the
source code for another Cheetah template.
The major expected use cases are:
a) 'compile-time caching' aka 'partial template binding',
wherein an intermediate Cheetah template is used to output
the source for the final Cheetah template. The intermediate
template is a mix of a modified Cheetah syntax (the
'preprocess syntax') and standard Cheetah syntax. The
preprocessor syntax is executed at compile time and outputs
Cheetah code which is then compiled in turn. This approach
allows one to completely soft-code all the elements in the
template which are subject to change yet have it compile to
extremely efficient Python code with everything but the
elements that must be variable at runtime (per browser
request, etc.) compiled as static strings. Examples of this
usage pattern will be added to the Cheetah Users' Guide.
The'preprocess syntax' is just Cheetah's standard one with
alternatives for the $ and # tokens:
e.g. '@' and '%' for code like this
@aPreprocessVar $aRuntimeVar
%if aCompileTimeCondition then yyy else zzz
%% preprocessor comment
#if aRunTimeCondition then aaa else bbb
## normal comment
$aRuntimeVar
b) adding #import and #extends directives dynamically based on
the source
If preprocessors are provided, Cheetah pipes the source code
through each one in the order provided. Each preprocessor should
accept the args (source, file) and should return a tuple (source,
file).
The argument value should be a list, but a single non-list value
is acceptable and will automatically be converted into a list.
Each item in the list will be passed through
Template._normalizePreprocessor(). The items should either match
one of the following forms:
- an object with a .preprocess(source, file) method
- a callable with the following signature:
source, file = f(source, file)
or one of the forms below:
- a single string denoting the 2 'tokens' for the preprocess
syntax. The tokens should be in the order (placeholderToken,
directiveToken) and should separated with a space:
e.g. '@ %'
klass = Template.compile(src, preprocessors='@ %')
# or
klass = Template.compile(src, preprocessors=['@ %'])
- a dict with the following keys or an object with the
following attributes (all are optional, but nothing will
happen if you don't provide at least one):
- tokens: same as the single string described above. You can
also provide a tuple of 2 strings.
- searchList: the searchList used for preprocess $placeholders
- compilerSettings: used in the compilation of the intermediate
template
- templateAPIClass: an optional subclass of `Template`
- outputTransformer: a simple hook for passing in a callable
which can do further transformations of the preprocessor
output, or do something else like debug logging. The
default is str().
+ any keyword arguments to Template.compile which you want to
provide for the compilation of the intermediate template.
klass = Template.compile(src,
preprocessors=[ dict(tokens='@ %', searchList=[...]) ] )
"""
errmsg = "arg '%s' must be %s"
if not isinstance(source, (types.NoneType, basestring)):
raise TypeError(errmsg % ('source', 'string or None'))
if not isinstance(file, (types.NoneType, basestring, filetype)):
raise TypeError(errmsg %
('file', 'string, file-like object, or None'))
if baseclass is Unspecified:
baseclass = klass._CHEETAH_defaultBaseclassForTemplates
if isinstance(baseclass, Template):
baseclass = baseclass.__class__
if not isinstance(baseclass, (types.NoneType, basestring, type)):
raise TypeError(errmsg % ('baseclass', 'string, class or None'))
if cacheCompilationResults is Unspecified:
cacheCompilationResults = klass._CHEETAH_cacheCompilationResults
if not isinstance(cacheCompilationResults, (int, bool)):
raise TypeError(errmsg % ('cacheCompilationResults', 'boolean'))
if useCache is Unspecified:
useCache = klass._CHEETAH_useCompilationCache
if not isinstance(useCache, (int, bool)):
raise TypeError(errmsg % ('useCache', 'boolean'))
if compilerSettings is Unspecified:
compilerSettings = klass._getCompilerSettings(source, file) or {}
if not isinstance(compilerSettings, dict):
raise TypeError(errmsg % ('compilerSettings', 'dictionary'))
if compilerClass is Unspecified:
compilerClass = klass._getCompilerClass(source, file)
if preprocessors is Unspecified:
preprocessors = klass._CHEETAH_preprocessors
if keepRefToGeneratedCode is Unspecified:
keepRefToGeneratedCode = klass._CHEETAH_keepRefToGeneratedCode
if not isinstance(keepRefToGeneratedCode, (int, bool)):
raise TypeError(errmsg % ('keepReftoGeneratedCode', 'boolean'))
if not isinstance(moduleName, (types.NoneType, basestring)):
raise TypeError(errmsg % ('moduleName', 'string or None'))
__orig_file__ = None
if not moduleName:
if file and isinstance(file, basestring):
moduleName = convertTmplPathToModuleName(file)
__orig_file__ = file
else:
moduleName = klass._CHEETAH_defaultModuleNameForTemplates
if className is Unspecified:
className = klass._CHEETAH_defaultClassNameForTemplates
if not isinstance(className, (types.NoneType, basestring)):
raise TypeError(errmsg % ('className', 'string or None'))
className = re.sub(r'^_+','', className or moduleName)
if mainMethodName is Unspecified:
mainMethodName = klass._CHEETAH_defaultMainMethodNameForTemplates
if not isinstance(mainMethodName, (types.NoneType, basestring)):
raise TypeError(errmsg % ('mainMethodName', 'string or None'))
if moduleGlobals is Unspecified:
moduleGlobals = klass._CHEETAH_defaultModuleGlobalsForTemplates
if cacheModuleFilesForTracebacks is Unspecified:
cacheModuleFilesForTracebacks = klass._CHEETAH_cacheModuleFilesForTracebacks
if not isinstance(cacheModuleFilesForTracebacks, (int, bool)):
raise TypeError(errmsg %
('cacheModuleFilesForTracebacks', 'boolean'))
if cacheDirForModuleFiles is Unspecified:
cacheDirForModuleFiles = klass._CHEETAH_cacheDirForModuleFiles
if not isinstance(cacheDirForModuleFiles, (types.NoneType, basestring)):
raise TypeError(errmsg %
('cacheDirForModuleFiles', 'string or None'))
##################################################
## handle any preprocessors
if preprocessors:
origSrc = source
source, file = klass._preprocessSource(source, file, preprocessors)
##################################################
## compilation, using cache if requested/possible
baseclassValue = None
baseclassName = None
if baseclass:
if isinstance(baseclass, basestring):
baseclassName = baseclass
elif isinstance(baseclass, type):
# @@TR: should soft-code this
baseclassName = 'CHEETAH_dynamicallyAssignedBaseClass_'+baseclass.__name__
baseclassValue = baseclass
cacheHash = None
cacheItem = None
if source or isinstance(file, basestring):
compilerSettingsHash = None
if compilerSettings:
compilerSettingsHash = hashDict(compilerSettings)
moduleGlobalsHash = None
if moduleGlobals:
moduleGlobalsHash = hashDict(moduleGlobals)
fileHash = None
if file:
fileHash = str(hash(file))
if globals()['__checkFileMtime']:
fileHash += str(os.path.getmtime(file))
try:
# @@TR: find some way to create a cacheHash that is consistent
# between process restarts. It would allow for caching the
# compiled module on disk and thereby reduce the startup time
# for applications that use a lot of dynamically compiled
# templates.
cacheHash = ''.join([str(v) for v in
[hash(source),
fileHash,
className,
moduleName,
mainMethodName,
hash(compilerClass),
hash(baseclass),
compilerSettingsHash,
moduleGlobalsHash,
hash(cacheDirForModuleFiles),
]])
except:
#@@TR: should add some logging to this
pass
outputEncoding = 'ascii'
compiler = None
if useCache and cacheHash and cacheHash in klass._CHEETAH_compileCache:
cacheItem = klass._CHEETAH_compileCache[cacheHash]
generatedModuleCode = cacheItem.code
else:
compiler = compilerClass(source, file,
moduleName=moduleName,
mainClassName=className,
baseclassName=baseclassName,
mainMethodName=mainMethodName,
settings=(compilerSettings or {}))
if commandlineopts:
compiler.setShBang(commandlineopts.shbang)
compiler.compile()
generatedModuleCode = compiler.getModuleCode()
outputEncoding = compiler.getModuleEncoding()
if not returnAClass:
# This is a bit of a hackish solution to make sure we're setting the proper
# encoding on generated code that is destined to be written to a file
if not outputEncoding == 'ascii':
generatedModuleCode = generatedModuleCode.split('\n')
generatedModuleCode.insert(1, '# -*- coding: %s -*-' % outputEncoding)
generatedModuleCode = '\n'.join(generatedModuleCode)
return generatedModuleCode.encode(outputEncoding)
else:
if cacheItem:
cacheItem.lastCheckoutTime = time.time()
return cacheItem.klass
try:
klass._CHEETAH_compileLock.acquire()
uniqueModuleName = _genUniqueModuleName(moduleName)
__file__ = uniqueModuleName+'.py' # relative file path with no dir part
if cacheModuleFilesForTracebacks:
if not os.path.exists(cacheDirForModuleFiles):
raise Exception('%s does not exist'%cacheDirForModuleFiles)
__file__ = os.path.join(cacheDirForModuleFiles, __file__)
# @@TR: might want to assert that it doesn't already exist
open(__file__, 'w').write(generatedModuleCode)
# @@TR: should probably restrict the perms, etc.
mod = types.ModuleType(str(uniqueModuleName))
if moduleGlobals:
for k, v in moduleGlobals.items():
setattr(mod, k, v)
mod.__file__ = __file__
if __orig_file__ and os.path.exists(__orig_file__):
# this is used in the WebKit filemonitoring code
mod.__orig_file__ = __orig_file__
if baseclass and baseclassValue:
setattr(mod, baseclassName, baseclassValue)
##
try:
co = compile(generatedModuleCode, __file__, 'exec')
exec(co, mod.__dict__)
except SyntaxError, e:
try:
parseError = genParserErrorFromPythonException(
source, file, generatedModuleCode, exception=e)
except:
updateLinecache(__file__, generatedModuleCode)
e.generatedModuleCode = generatedModuleCode
raise e
else:
raise parseError
except Exception, e:
updateLinecache(__file__, generatedModuleCode)
e.generatedModuleCode = generatedModuleCode
raise
##
sys.modules[uniqueModuleName] = mod
finally:
klass._CHEETAH_compileLock.release()
templateClass = getattr(mod, className)
if (cacheCompilationResults
and cacheHash
and cacheHash not in klass._CHEETAH_compileCache):
cacheItem = CompileCacheItem()
cacheItem.cacheTime = cacheItem.lastCheckoutTime = time.time()
cacheItem.code = generatedModuleCode
cacheItem.klass = templateClass
templateClass._CHEETAH_isInCompilationCache = True
klass._CHEETAH_compileCache[cacheHash] = cacheItem
else:
templateClass._CHEETAH_isInCompilationCache = False
if keepRefToGeneratedCode or cacheCompilationResults:
templateClass._CHEETAH_generatedModuleCode = generatedModuleCode
# If we have a compiler object, let's set it to the compiler class
# to help the directive analyzer code
if compiler:
templateClass._CHEETAH_compilerInstance = compiler
return templateClass
@classmethod
def subclass(klass, *args, **kws):
"""Takes the same args as the .compile() classmethod and returns a
template that is a subclass of the template this method is called from.
T1 = Template.compile(' foo - $meth1 - bar\n#def meth1: this is T1.meth1')
T2 = T1.subclass('#implements meth1\n this is T2.meth1')
"""
kws['baseclass'] = klass
if isinstance(klass, Template):
templateAPIClass = klass
else:
templateAPIClass = Template
return templateAPIClass.compile(*args, **kws)
@classmethod
def _preprocessSource(klass, source, file, preprocessors):
"""Iterates through the .compile() classmethod's preprocessors argument
and pipes the source code through each each preprocessor.
It returns the tuple (source, file) which is then used by
Template.compile to finish the compilation.
"""
if not isinstance(preprocessors, (list, tuple)):
preprocessors = [preprocessors]
for preprocessor in preprocessors:
preprocessor = klass._normalizePreprocessorArg(preprocessor)
source, file = preprocessor.preprocess(source, file)
return source, file
@classmethod
def _normalizePreprocessorArg(klass, arg):
"""Used to convert the items in the .compile() classmethod's
preprocessors argument into real source preprocessors. This permits the
use of several shortcut forms for defining preprocessors.
"""
if hasattr(arg, 'preprocess'):
return arg
elif hasattr(arg, '__call__'):
class WrapperPreprocessor:
def preprocess(self, source, file):
return arg(source, file)
return WrapperPreprocessor()
else:
class Settings(object):
placeholderToken = None
directiveToken = None
settings = Settings()
if isinstance(arg, str) or isinstance(arg, (list, tuple)):
settings.tokens = arg
elif isinstance(arg, dict):
for k, v in arg.items():
setattr(settings, k, v)
else:
settings = arg
settings = klass._normalizePreprocessorSettings(settings)
return klass._CHEETAH_defaultPreprocessorClass(settings)
@classmethod
def _normalizePreprocessorSettings(klass, settings):
settings.keepRefToGeneratedCode = True
def normalizeSearchList(searchList):
if not isinstance(searchList, (list, tuple)):
searchList = [searchList]
return searchList
def normalizeTokens(tokens):
if isinstance(tokens, str):
return tokens.split() # space delimited string e.g.'@ %'
elif isinstance(tokens, (list, tuple)):
return tokens
else:
raise PreprocessError('invalid tokens argument: %r'%tokens)
if hasattr(settings, 'tokens'):
(settings.placeholderToken,
settings.directiveToken) = normalizeTokens(settings.tokens)
if (not getattr(settings, 'compilerSettings', None)
and not getattr(settings, 'placeholderToken', None) ):
raise TypeError(
'Preprocessor requires either a "tokens" or a "compilerSettings" arg.'
' Neither was provided.')
if not hasattr(settings, 'templateInitArgs'):
settings.templateInitArgs = {}
if 'searchList' not in settings.templateInitArgs:
if not hasattr(settings, 'searchList') and hasattr(settings, 'namespaces'):
settings.searchList = settings.namespaces
elif not hasattr(settings, 'searchList'):
settings.searchList = []
settings.templateInitArgs['searchList'] = settings.searchList
settings.templateInitArgs['searchList'] = (
normalizeSearchList(settings.templateInitArgs['searchList']))
if not hasattr(settings, 'outputTransformer'):
settings.outputTransformer = unicode
if not hasattr(settings, 'templateAPIClass'):
class PreprocessTemplateAPIClass(klass): pass
settings.templateAPIClass = PreprocessTemplateAPIClass
if not hasattr(settings, 'compilerSettings'):
settings.compilerSettings = {}
klass._updateSettingsWithPreprocessTokens(
compilerSettings=settings.compilerSettings,
placeholderToken=settings.placeholderToken,
directiveToken=settings.directiveToken
)
return settings
@classmethod
def _updateSettingsWithPreprocessTokens(
klass, compilerSettings, placeholderToken, directiveToken):
if (placeholderToken and 'cheetahVarStartToken' not in compilerSettings):
compilerSettings['cheetahVarStartToken'] = placeholderToken
if directiveToken:
if 'directiveStartToken' not in compilerSettings:
compilerSettings['directiveStartToken'] = directiveToken
if 'directiveEndToken' not in compilerSettings:
compilerSettings['directiveEndToken'] = directiveToken
if 'commentStartToken' not in compilerSettings:
compilerSettings['commentStartToken'] = directiveToken*2
if 'multiLineCommentStartToken' not in compilerSettings:
compilerSettings['multiLineCommentStartToken'] = (
directiveToken+'*')
if 'multiLineCommentEndToken' not in compilerSettings:
compilerSettings['multiLineCommentEndToken'] = (
'*'+directiveToken)
if 'EOLSlurpToken' not in compilerSettings:
compilerSettings['EOLSlurpToken'] = directiveToken
@classmethod
def _addCheetahPlumbingCodeToClass(klass, concreteTemplateClass):
"""If concreteTemplateClass is not a subclass of Cheetah.Template, add
the required cheetah methods and attributes to it.
This is called on each new template class after it has been compiled.
If concreteTemplateClass is not a subclass of Cheetah.Template but
already has method with the same name as one of the required cheetah
methods, this will skip that method.
"""
for methodname in klass._CHEETAH_requiredCheetahMethods:
if not hasattr(concreteTemplateClass, methodname):
method = getattr(Template, methodname)
newMethod = createMethod(method.im_func, concreteTemplateClass)
setattr(concreteTemplateClass, methodname, newMethod)
for classMethName in klass._CHEETAH_requiredCheetahClassMethods:
if not hasattr(concreteTemplateClass, classMethName):
meth = getattr(klass, classMethName)
setattr(concreteTemplateClass, classMethName, classmethod(meth.im_func))
for attrname in klass._CHEETAH_requiredCheetahClassAttributes:
attrname = '_CHEETAH_'+attrname
if not hasattr(concreteTemplateClass, attrname):
attrVal = getattr(klass, attrname)
setattr(concreteTemplateClass, attrname, attrVal)
if (not hasattr(concreteTemplateClass, '__str__')
or concreteTemplateClass.__str__ is object.__str__):
mainMethNameAttr = '_mainCheetahMethod_for_'+concreteTemplateClass.__name__
mainMethName = getattr(concreteTemplateClass, mainMethNameAttr, None)
if mainMethName:
def __str__(self):
rc = getattr(self, mainMethName)()
if isinstance(rc, unicode):
return rc.encode('utf-8')
return rc
def __unicode__(self):
return getattr(self, mainMethName)()
elif (hasattr(concreteTemplateClass, 'respond')
and concreteTemplateClass.respond!=Servlet.respond):
def __str__(self):
rc = self.respond()
if isinstance(rc, unicode):
return rc.encode('utf-8')
return rc
def __unicode__(self):
return self.respond()
else:
def __str__(self):
rc = None
if hasattr(self, mainMethNameAttr):
rc = getattr(self, mainMethNameAttr)()
elif hasattr(self, 'respond'):
rc = self.respond()
else:
rc = super(self.__class__, self).__str__()
if isinstance(rc, unicode):
return rc.encode('utf-8')
return rc
def __unicode__(self):
if hasattr(self, mainMethNameAttr):
return getattr(self, mainMethNameAttr)()
elif hasattr(self, 'respond'):
return self.respond()
else:
return super(self.__class__, self).__unicode__()
__str__ = createMethod(__str__, concreteTemplateClass)
__unicode__ = createMethod(__unicode__, concreteTemplateClass)
setattr(concreteTemplateClass, '__str__', __str__)
setattr(concreteTemplateClass, '__unicode__', __unicode__)
def __init__(self, source=None,
namespaces=None, searchList=None,
# use either or. They are aliases for the same thing.
file=None,
filter='RawOrEncodedUnicode', # which filter from Cheetah.Filters
filtersLib=Filters,
errorCatcher=None,
compilerSettings=Unspecified, # control the behaviour of the compiler
_globalSetVars=None, # used internally for #include'd templates
_preBuiltSearchList=None # used internally for #include'd templates
):
"""a) compiles a new template OR b) instantiates an existing template.
Read this docstring carefully as there are two distinct usage patterns.
You should also read this class' main docstring.
a) to compile a new template:
t = Template(source=aSourceString)
# or
t = Template(file='some/path')
# or
t = Template(file=someFileObject)
# or
namespaces = [{'foo':'bar'}]
t = Template(source=aSourceString, namespaces=namespaces)
# or
t = Template(file='some/path', namespaces=namespaces)
print t
b) to create an instance of an existing, precompiled template class:
## i) first you need a reference to a compiled template class:
tclass = Template.compile(source=src) # or just Template.compile(src)
# or
tclass = Template.compile(file='some/path')
# or
tclass = Template.compile(file=someFileObject)
# or
# if you used the command line compiler or have Cheetah's ImportHooks
# installed your template class is also available via Python's
# standard import mechanism:
from ACompileTemplate import AcompiledTemplate as tclass
## ii) then you create an instance
t = tclass(namespaces=namespaces)
# or
t = tclass(namespaces=namespaces, filter='RawOrEncodedUnicode')
print t
Arguments:
for usage pattern a)
If you are compiling a new template, you must provide either a
'source' or 'file' arg, but not both:
- source (string or None)
- file (string path, file-like object, or None)
Optional args (see below for more) :
- compilerSettings
Default: Template._CHEETAH_compilerSettings=None
a dictionary of settings to override those defined in
DEFAULT_COMPILER_SETTINGS. See
Cheetah.Template.DEFAULT_COMPILER_SETTINGS and the Users' Guide
for details.
You can pass the source arg in as a positional arg with this usage
pattern. Use keywords for all other args.
for usage pattern b)
Do not use positional args with this usage pattern, unless your
template subclasses something other than Cheetah.Template and you
want to pass positional args to that baseclass. E.g.:
dictTemplate = Template.compile('hello $name from $caller', baseclass=dict)
tmplvars = dict(name='world', caller='me')
print dictTemplate(tmplvars)
This usage requires all Cheetah args to be passed in as keyword args.
optional args for both usage patterns:
- namespaces (aka 'searchList')
Default: None
an optional list of namespaces (dictionaries, objects, modules,
etc.) which Cheetah will search through to find the variables
referenced in $placeholders.
If you provide a single namespace instead of a list, Cheetah will
automatically convert it into a list.
NOTE: Cheetah does NOT force you to use the namespaces search list
and related features. It's on by default, but you can turn if off
using the compiler settings useSearchList=False or
useNameMapper=False.
- filter
Default: 'EncodeUnicode'
Which filter should be used for output filtering. This should
either be a string which is the name of a filter in the
'filtersLib' or a subclass of Cheetah.Filters.Filter. . See the
Users' Guide for more details.
- filtersLib
Default: Cheetah.Filters
A module containing subclasses of Cheetah.Filters.Filter. See the
Users' Guide for more details.
- errorCatcher
Default: None
This is a debugging tool. See the Users' Guide for more details.
Do not use this or the #errorCatcher diretive with live
production systems.
Do NOT mess with the args _globalSetVars or _preBuiltSearchList!
"""
errmsg = "arg '%s' must be %s"
errmsgextra = errmsg + "\n%s"
if not isinstance(source, (types.NoneType, basestring)):
raise TypeError(errmsg % ('source', 'string or None'))
if not isinstance(source, (types.NoneType, basestring, filetype)):
raise TypeError(errmsg %
('file', 'string, file open for reading, or None'))
if not isinstance(filter, (basestring, types.TypeType)) and not \
(isinstance(filter, type) and issubclass(filter, Filters.Filter)):
raise TypeError(errmsgextra %
('filter', 'string or class',
'(if class, must be subclass of Cheetah.Filters.Filter)'))
if not isinstance(filtersLib, (basestring, types.ModuleType)):
raise TypeError(errmsgextra %
('filtersLib', 'string or module',
'(if module, must contain subclasses of Cheetah.Filters.Filter)'))
if not errorCatcher is None:
err = True
if isinstance(errorCatcher, (basestring, types.TypeType)):
err = False
if isinstance(errorCatcher, type) and \
issubclass(errorCatcher, ErrorCatchers.ErrorCatcher):
err = False
if err:
raise TypeError(errmsgextra %
('errorCatcher', 'string, class or None',
'(if class, must be subclass of Cheetah.ErrorCatchers.ErrorCatcher)'))
if compilerSettings is not Unspecified:
if not isinstance(compilerSettings, types.DictType):
raise TypeError(errmsg %
('compilerSettings', 'dictionary'))
if source is not None and file is not None:
raise TypeError("you must supply either a source string or the" +
" 'file' keyword argument, but not both")
##################################################
## Do superclass initialization.
super(Template, self).__init__()
##################################################
## Do required version check
if not hasattr(self, '_CHEETAH_versionTuple'):
try:
mod = sys.modules[self.__class__.__module__]
compiledVersion = mod.__CHEETAH_version__
compiledVersionTuple = convertVersionStringToTuple(compiledVersion)
if compiledVersionTuple < MinCompatibleVersionTuple:
raise AssertionError(
'This template was compiled with Cheetah version'
' %s. Templates compiled before version %s must be recompiled.'%(
compiledVersion, MinCompatibleVersion))
except AssertionError:
raise
except:
pass
##################################################
## Setup instance state attributes used during the life of template
## post-compile
if searchList:
for namespace in searchList:
if isinstance(namespace, dict):
intersection = self.Reserved_SearchList & set(namespace.keys())
warn = False
if intersection:
warn = True
if isinstance(compilerSettings, dict) and compilerSettings.get('prioritizeSearchListOverSelf'):
warn = False
if warn:
logging.info(''' The following keys are members of the Template class and will result in NameMapper collisions! ''')
logging.info(''' > %s ''' % ', '.join(list(intersection)))
logging.info(''' Please change the key's name or use the compiler setting "prioritizeSearchListOverSelf=True" to prevent the NameMapper from using ''')
logging.info(''' the Template member in place of your searchList variable ''')
self._initCheetahInstance(
searchList=searchList, namespaces=namespaces,
filter=filter, filtersLib=filtersLib,
errorCatcher=errorCatcher,
_globalSetVars=_globalSetVars,
compilerSettings=compilerSettings,
_preBuiltSearchList=_preBuiltSearchList)
##################################################
## Now, compile if we're meant to
if (source is not None) or (file is not None):
self._compile(source, file, compilerSettings=compilerSettings)
def generatedModuleCode(self):
"""Return the module code the compiler generated, or None if no
compilation took place.
"""
return self._CHEETAH_generatedModuleCode
def generatedClassCode(self):
"""Return the class code the compiler generated, or None if no
compilation took place.
"""
return self._CHEETAH_generatedModuleCode[
self._CHEETAH_generatedModuleCode.find('\nclass '):
self._CHEETAH_generatedModuleCode.find('\n## END CLASS DEFINITION')]
def searchList(self):
"""Return a reference to the searchlist
"""
return self._CHEETAH__searchList
def errorCatcher(self):
"""Return a reference to the current errorCatcher
"""
return self._CHEETAH__errorCatcher
## cache methods ##
def _getCacheStore(self):
if not self._CHEETAH__cacheStore:
if self._CHEETAH_cacheStore is not None:
self._CHEETAH__cacheStore = self._CHEETAH_cacheStore
else:
# @@TR: might want to provide a way to provide init args
self._CHEETAH__cacheStore = self._CHEETAH_cacheStoreClass()
return self._CHEETAH__cacheStore
def _getCacheStoreIdPrefix(self):
if self._CHEETAH_cacheStoreIdPrefix is not None:
return self._CHEETAH_cacheStoreIdPrefix
else:
return str(id(self))
def _createCacheRegion(self, regionID):
return self._CHEETAH_cacheRegionClass(
regionID=regionID,
templateCacheIdPrefix=self._getCacheStoreIdPrefix(),
cacheStore=self._getCacheStore())
def getCacheRegion(self, regionID, cacheInfo=None, create=True):
cacheRegion = self._CHEETAH__cacheRegions.get(regionID)
if not cacheRegion and create:
cacheRegion = self._createCacheRegion(regionID)
self._CHEETAH__cacheRegions[regionID] = cacheRegion
return cacheRegion
def getCacheRegions(self):
"""Returns a dictionary of the 'cache regions' initialized in a
template.
Each #cache directive block or $*cachedPlaceholder is a separate 'cache
region'.
"""
# returns a copy to prevent users mucking it up
return self._CHEETAH__cacheRegions.copy()
def refreshCache(self, cacheRegionId=None, cacheItemId=None):
"""Refresh a cache region or a specific cache item within a region.
"""
if not cacheRegionId:
for cacheRegion in self.getCacheRegions().itervalues():
cacheRegion.clear()
else:
cregion = self._CHEETAH__cacheRegions.get(cacheRegionId)
if not cregion:
return
if not cacheItemId: # clear the desired region and all its cacheItems
cregion.clear()
else: # clear one specific cache of a specific region
cache = cregion.getCacheItem(cacheItemId)
if cache:
cache.clear()
## end cache methods ##
def shutdown(self):
"""Break reference cycles before discarding a servlet.
"""
try:
Servlet.shutdown(self)
except:
pass
self._CHEETAH__searchList = None
self.__dict__ = {}
## utility functions ##
def getVar(self, varName, default=Unspecified, autoCall=True):
"""Get a variable from the searchList. If the variable can't be found
in the searchList, it returns the default value if one was given, or
raises NameMapper.NotFound.
"""
try:
return valueFromSearchList(self.searchList(), varName.replace('$', ''), autoCall)
except NotFound:
if default is not Unspecified:
return default
else:
raise
def varExists(self, varName, autoCall=True):
"""Test if a variable name exists in the searchList.
"""
try:
valueFromSearchList(self.searchList(), varName.replace('$', ''), autoCall)
return True
except NotFound:
return False
hasVar = varExists
def i18n(self, message,
plural=None,
n=None,
id=None,
domain=None,
source=None,
target=None,
comment=None
):
"""This is just a stub at this time.
plural = the plural form of the message
n = a sized argument to distinguish between single and plural forms
id = msgid in the translation catalog
domain = translation domain
source = source lang
target = a specific target lang
comment = a comment to the translation team
See the following for some ideas
http://www.zope.org/DevHome/Wikis/DevSite/Projects/ComponentArchitecture/ZPTInternationalizationSupport
Other notes:
- There is no need to replicate the i18n:name attribute from plone / PTL,
as cheetah placeholders serve the same purpose
"""
return message
def getFileContents(self, path):
"""A hook for getting the contents of a file. The default
implementation just uses the Python open() function to load local files.
This method could be reimplemented to allow reading of remote files via
various protocols, as PHP allows with its 'URL fopen wrapper'
"""
fp = open(path, 'r')
output = fp.read()
fp.close()
return output
def runAsMainProgram(self):
"""Allows the Template to function as a standalone command-line program
for static page generation.
Type 'python yourtemplate.py --help to see what it's capabable of.
"""
from TemplateCmdLineIface import CmdLineIface
CmdLineIface(templateObj=self).run()
##################################################
## internal methods -- not to be called by end-users
def _initCheetahInstance(self,
searchList=None,
namespaces=None,
filter='RawOrEncodedUnicode', # which filter from Cheetah.Filters
filtersLib=Filters,
errorCatcher=None,
_globalSetVars=None,
compilerSettings=None,
_preBuiltSearchList=None):
"""Sets up the instance attributes that cheetah templates use at
run-time.
This is automatically called by the __init__ method of compiled
templates.
Note that the names of instance attributes used by Cheetah are prefixed
with '_CHEETAH__' (2 underscores), where class attributes are prefixed
with '_CHEETAH_' (1 underscore).
"""
if getattr(self, '_CHEETAH__instanceInitialized', False):
return
if namespaces is not None:
assert searchList is None, (
'Provide "namespaces" or "searchList", not both!')
searchList = namespaces
if searchList is not None and not isinstance(searchList, (list, tuple)):
searchList = [searchList]
self._CHEETAH__globalSetVars = {}
if _globalSetVars is not None:
# this is intended to be used internally by Nested Templates in #include's
self._CHEETAH__globalSetVars = _globalSetVars
if _preBuiltSearchList is not None:
# happens with nested Template obj creation from #include's
self._CHEETAH__searchList = list(_preBuiltSearchList)
self._CHEETAH__searchList.append(self)
else:
# create our own searchList
self._CHEETAH__searchList = [self._CHEETAH__globalSetVars, self]
if searchList is not None:
if isinstance(compilerSettings, dict) and compilerSettings.get('prioritizeSearchListOverSelf'):
self._CHEETAH__searchList = searchList + self._CHEETAH__searchList
else:
self._CHEETAH__searchList.extend(list(searchList))
self._CHEETAH__cheetahIncludes = {}
self._CHEETAH__cacheRegions = {}
self._CHEETAH__indenter = Indenter()
# @@TR: consider allowing simple callables as the filter argument
self._CHEETAH__filtersLib = filtersLib
self._CHEETAH__filters = {}
if isinstance(filter, basestring):
filterName = filter
klass = getattr(self._CHEETAH__filtersLib, filterName)
else:
klass = filter
filterName = klass.__name__
self._CHEETAH__currentFilter = self._CHEETAH__filters[filterName] = klass(self).filter
self._CHEETAH__initialFilter = self._CHEETAH__currentFilter
self._CHEETAH__errorCatchers = {}
if errorCatcher:
if isinstance(errorCatcher, basestring):
errorCatcherClass = getattr(ErrorCatchers, errorCatcher)
elif isinstance(errorCatcher, type):
errorCatcherClass = errorCatcher
self._CHEETAH__errorCatcher = ec = errorCatcherClass(self)
self._CHEETAH__errorCatchers[errorCatcher.__class__.__name__] = ec
else:
self._CHEETAH__errorCatcher = None
self._CHEETAH__initErrorCatcher = self._CHEETAH__errorCatcher
if not hasattr(self, 'transaction'):
self.transaction = None
self._CHEETAH__instanceInitialized = True
self._CHEETAH__isBuffering = False
self._CHEETAH__isControlledByWebKit = False
self._CHEETAH__cacheStore = None
if self._CHEETAH_cacheStore is not None:
self._CHEETAH__cacheStore = self._CHEETAH_cacheStore
def _compile(self, source=None, file=None, compilerSettings=Unspecified,
moduleName=None, mainMethodName=None):
"""Compile the template. This method is automatically called by
Template.__init__ it is provided with 'file' or 'source' args.
USERS SHOULD *NEVER* CALL THIS METHOD THEMSELVES. Use Template.compile
instead.
"""
if compilerSettings is Unspecified:
compilerSettings = self._getCompilerSettings(source, file) or {}
mainMethodName = mainMethodName or self._CHEETAH_defaultMainMethodName
self._fileMtime = None
self._fileDirName = None
self._fileBaseName = None
if file and isinstance(file, basestring):
file = self.serverSidePath(file)
self._fileMtime = os.path.getmtime(file)
self._fileDirName, self._fileBaseName = os.path.split(file)
self._filePath = file
templateClass = self.compile(source, file,
moduleName=moduleName,
mainMethodName=mainMethodName,
compilerSettings=compilerSettings,
keepRefToGeneratedCode=True)
if not self.__class__ == Template:
# Only propogate attributes if we're in a subclass of
# Template
for k, v in self.__class__.__dict__.iteritems():
if not v or k.startswith('__'):
continue
## Propogate the class attributes to the instance
## since we're about to obliterate self.__class__
## (see: cheetah.Tests.Tepmlate.SubclassSearchListTest)
setattr(self, k, v)
self.__class__ = templateClass
# must initialize it so instance attributes are accessible
templateClass.__init__(self,
#_globalSetVars=self._CHEETAH__globalSetVars,
#_preBuiltSearchList=self._CHEETAH__searchList
)
if not hasattr(self, 'transaction'):
self.transaction = None
def _handleCheetahInclude(self, srcArg, trans=None, includeFrom='file', raw=False):
"""Called at runtime to handle #include directives.
"""
_includeID = srcArg
if _includeID not in self._CHEETAH__cheetahIncludes:
if not raw:
if includeFrom == 'file':
source = None
if isinstance(srcArg, basestring):
if hasattr(self, 'serverSidePath'):
file = path = self.serverSidePath(srcArg)
else:
file = path = os.path.normpath(srcArg)
else:
file = srcArg ## a file-like object
else:
source = srcArg
file = None
# @@TR: might want to provide some syntax for specifying the
# Template class to be used for compilation so compilerSettings
# can be changed.
compiler = self._getTemplateAPIClassForIncludeDirectiveCompilation(source, file)
nestedTemplateClass = compiler.compile(source=source, file=file)
nestedTemplate = nestedTemplateClass(_preBuiltSearchList=self.searchList(),
_globalSetVars=self._CHEETAH__globalSetVars)
# Set the inner template filters to the initial filter of the
# outer template:
# this is the only really safe way to use
# filter='WebSafe'.
nestedTemplate._CHEETAH__initialFilter = self._CHEETAH__initialFilter
nestedTemplate._CHEETAH__currentFilter = self._CHEETAH__initialFilter
self._CHEETAH__cheetahIncludes[_includeID] = nestedTemplate
else:
if includeFrom == 'file':
path = self.serverSidePath(srcArg)
self._CHEETAH__cheetahIncludes[_includeID] = self.getFileContents(path)
else:
self._CHEETAH__cheetahIncludes[_includeID] = srcArg
##
if not raw:
self._CHEETAH__cheetahIncludes[_includeID].respond(trans)
else:
trans.response().write(self._CHEETAH__cheetahIncludes[_includeID])
def _getTemplateAPIClassForIncludeDirectiveCompilation(self, source, file):
"""Returns the subclass of Template which should be used to compile
#include directives.
This abstraction allows different compiler settings to be used in the
included template than were used in the parent.
"""
if issubclass(self.__class__, Template):
return self.__class__
else:
return Template
## functions for using templates as CGI scripts
def webInput(self, names, namesMulti=(), default='', src='f',
defaultInt=0, defaultFloat=0.00, badInt=0, badFloat=0.00, debug=False):
"""Method for importing web transaction variables in bulk.
This works for GET/POST fields both in Webware servlets and in CGI
scripts, and for cookies and session variables in Webware servlets. If
you try to read a cookie or session variable in a CGI script, you'll get
a RuntimeError. 'In a CGI script' here means 'not running as a Webware
servlet'. If the CGI environment is not properly set up, Cheetah will
act like there's no input.
The public method provided is:
def webInput(self, names, namesMulti=(), default='', src='f',
defaultInt=0, defaultFloat=0.00, badInt=0, badFloat=0.00, debug=False):
This method places the specified GET/POST fields, cookies or session
variables into a dictionary, which is both returned and put at the
beginning of the searchList. It handles:
* single vs multiple values
* conversion to integer or float for specified names
* default values/exceptions for missing or bad values
* printing a snapshot of all values retrieved for debugging
All the 'default*' and 'bad*' arguments have 'use or raise' behavior,
meaning that if they're a subclass of Exception, they're raised. If
they're anything else, that value is substituted for the missing/bad
value.
The simplest usage is:
#silent $webInput(['choice'])
$choice
dic = self.webInput(['choice'])
write(dic['choice'])
Both these examples retrieves the GET/POST field 'choice' and print it.
If you leave off the'#silent', all the values would be printed too. But
a better way to preview the values is
#silent $webInput(['name'], $debug=1)
because this pretty-prints all the values inside HTML <PRE> tags.
** KLUDGE: 'debug' is supposed to insert into the template output, but it
wasn't working so I changed it to a'print' statement. So the debugging
output will appear wherever standard output is pointed, whether at the
terminal, in a Webware log file, or whatever. ***
Since we didn't specify any coversions, the value is a string. It's a
'single' value because we specified it in 'names' rather than
'namesMulti'. Single values work like this:
* If one value is found, take it.
* If several values are found, choose one arbitrarily and ignore the rest.
* If no values are found, use or raise the appropriate 'default*' value.
Multi values work like this:
* If one value is found, put it in a list.
* If several values are found, leave them in a list.
* If no values are found, use the empty list ([]). The 'default*'
arguments are *not* consulted in this case.
Example: assume 'days' came from a set of checkboxes or a multiple combo
box on a form, and the user chose'Monday', 'Tuesday' and 'Thursday'.
#silent $webInput([], ['days'])
The days you chose are: #slurp
#for $day in $days
$day #slurp
#end for
dic = self.webInput([], ['days'])
write('The days you chose are: ')
for day in dic['days']:
write(day + ' ')
Both these examples print: 'The days you chose are: Monday Tuesday Thursday'.
By default, missing strings are replaced by '' and missing/bad numbers
by zero. (A'bad number' means the converter raised an exception for
it, usually because of non-numeric characters in the value.) This
mimics Perl/PHP behavior, and simplifies coding for many applications
where missing/bad values *should* be blank/zero. In those relatively
few cases where you must distinguish between empty-string/zero on the
one hand and missing/bad on the other, change the appropriate
'default*' and 'bad*' arguments to something like:
* None
* another constant value
* $NonNumericInputError/self.NonNumericInputError
* $ValueError/ValueError
(NonNumericInputError is defined in this class and is useful for
distinguishing between bad input vs a TypeError/ValueError thrown for
some other rason.)
Here's an example using multiple values to schedule newspaper
deliveries. 'checkboxes' comes from a form with checkboxes for all the
days of the week. The days the user previously chose are preselected.
The user checks/unchecks boxes as desired and presses Submit. The value
of 'checkboxes' is a list of checkboxes that were checked when Submit
was pressed. Our task now is to turn on the days the user checked, turn
off the days he unchecked, and leave on or off the days he didn't
change.
dic = self.webInput([], ['dayCheckboxes'])
wantedDays = dic['dayCheckboxes'] # The days the user checked.
for day, on in self.getAllValues():
if not on and wantedDays.has_key(day):
self.TurnOn(day)
# ... Set a flag or insert a database record ...
elif on and not wantedDays.has_key(day):
self.TurnOff(day)
# ... Unset a flag or delete a database record ...
'source' allows you to look up the variables from a number of different
sources:
'f' fields (CGI GET/POST parameters)
'c' cookies
's' session variables
'v' 'values', meaning fields or cookies
In many forms, you're dealing only with strings, which is why the
'default' argument is third and the numeric arguments are banished to
the end. But sometimes you want automatic number conversion, so that
you can do numeric comparisions in your templates without having to
write a bunch of conversion/exception handling code. Example:
#silent $webInput(['name', 'height:int'])
$name is $height cm tall.
#if $height >= 300
Wow, you're tall!
#else
Pshaw, you're short.
#end if
dic = self.webInput(['name', 'height:int'])
name = dic[name]
height = dic[height]
write('%s is %s cm tall.' % (name, height))
if height > 300:
write('Wow, you're tall!')
else:
write('Pshaw, you're short.')
To convert a value to a number, suffix ':int' or ':float' to the name.
The method will search first for a 'height:int' variable and then for a
'height' variable. (It will be called 'height' in the final
dictionary.) If a numeric conversion fails, use or raise 'badInt' or
'badFloat'. Missing values work the same way as for strings, except the
default is 'defaultInt' or 'defaultFloat' instead of 'default'.
If a name represents an uploaded file, the entire file will be read into
memory. For more sophistocated file-upload handling, leave that name
out of the list and do your own handling, or wait for
Cheetah.Utils.UploadFileMixin.
This only in a subclass that also inherits from Webware's Servlet or
HTTPServlet. Otherwise you'll get an AttributeError on 'self.request'.
EXCEPTIONS: ValueError if 'source' is not one of the stated characters.
TypeError if a conversion suffix is not ':int' or ':float'.
FUTURE EXPANSION: a future version of this method may allow source
cascading; e.g., 'vs' would look first in 'values' and then in session
variables.
Meta-Data
================================================================================
Author: Mike Orr <iron@mso.oz.net>
License: This software is released for unlimited distribution under the
terms of the MIT license. See the LICENSE file.
Version: $Revision: 1.186 $
Start Date: 2002/03/17
Last Revision Date: $Date: 2008/03/10 04:48:11 $
"""
src = src.lower()
isCgi = not self._CHEETAH__isControlledByWebKit
if isCgi and src in ('f', 'v'):
global _formUsedByWebInput
if _formUsedByWebInput is None:
_formUsedByWebInput = cgi.FieldStorage()
source, func = 'field', _formUsedByWebInput.getvalue
elif isCgi and src == 'c':
raise RuntimeError("can't get cookies from a CGI script")
elif isCgi and src == 's':
raise RuntimeError("can't get session variables from a CGI script")
elif isCgi and src == 'v':
source, func = 'value', self.request().value
elif isCgi and src == 's':
source, func = 'session', self.request().session().value
elif src == 'f':
source, func = 'field', self.request().field
elif src == 'c':
source, func = 'cookie', self.request().cookie
elif src == 'v':
source, func = 'value', self.request().value
elif src == 's':
source, func = 'session', self.request().session().value
else:
raise TypeError("arg 'src' invalid")
sources = source + 's'
converters = {
'': _Converter('string', None, default, default ),
'int': _Converter('int', int, defaultInt, badInt ),
'float': _Converter('float', float, defaultFloat, badFloat), }
#pprint.pprint(locals()); return {}
dic = {} # Destination.
for name in names:
k, v = _lookup(name, func, False, converters)
dic[k] = v
for name in namesMulti:
k, v = _lookup(name, func, True, converters)
dic[k] = v
# At this point, 'dic' contains all the keys/values we want to keep.
# We could split the method into a superclass
# method for Webware/WebwareExperimental and a subclass for Cheetah.
# The superclass would merely 'return dic'. The subclass would
# 'dic = super(ThisClass, self).webInput(names, namesMulti, ...)'
# and then the code below.
if debug:
print("<PRE>\n" + pprint.pformat(dic) + "\n</PRE>\n\n")
self.searchList().insert(0, dic)
return dic
T = Template # Short and sweet for debugging at the >>> prompt.
Template.Reserved_SearchList = set(dir(Template))
def genParserErrorFromPythonException(source, file, generatedPyCode, exception):
#print dir(exception)
filename = isinstance(file, (str, unicode)) and file or None
sio = StringIO.StringIO()
traceback.print_exc(1, sio)
formatedExc = sio.getvalue()
if hasattr(exception, 'lineno'):
pyLineno = exception.lineno
else:
pyLineno = int(re.search('[ \t]*File.*line (\d+)', formatedExc).group(1))
lines = generatedPyCode.splitlines()
prevLines = [] # (i, content)
for i in range(1, 4):
if pyLineno-i <=0:
break
prevLines.append( (pyLineno+1-i, lines[pyLineno-i]) )
nextLines = [] # (i, content)
for i in range(1, 4):
if not pyLineno+i < len(lines):
break
nextLines.append( (pyLineno+i, lines[pyLineno+i]) )
nextLines.reverse()
report = 'Line|Python Code\n'
report += '----|-------------------------------------------------------------\n'
while prevLines:
lineInfo = prevLines.pop()
report += "%(row)-4d|%(line)s\n"% {'row':lineInfo[0], 'line':lineInfo[1]}
if hasattr(exception, 'offset'):
report += ' '*(3+(exception.offset or 0)) + '^\n'
while nextLines:
lineInfo = nextLines.pop()
report += "%(row)-4d|%(line)s\n"% {'row':lineInfo[0], 'line':lineInfo[1]}
message = [
"Error in the Python code which Cheetah generated for this template:",
'='*80,
'',
str(exception),
'',
report,
'='*80,
]
cheetahPosMatch = re.search('line (\d+), col (\d+)', formatedExc)
if cheetahPosMatch:
lineno = int(cheetahPosMatch.group(1))
col = int(cheetahPosMatch.group(2))
#if hasattr(exception, 'offset'):
# col = exception.offset
message.append('\nHere is the corresponding Cheetah code:\n')
else:
lineno = None
col = None
cheetahPosMatch = re.search('line (\d+), col (\d+)',
'\n'.join(lines[max(pyLineno-2, 0):]))
if cheetahPosMatch:
lineno = int(cheetahPosMatch.group(1))
col = int(cheetahPosMatch.group(2))
message.append('\nHere is the corresponding Cheetah code.')
message.append('** I had to guess the line & column numbers,'
' so they are probably incorrect:\n')
message = '\n'.join(message)
reader = SourceReader(source, filename=filename)
return ParseError(reader, message, lineno=lineno, col=col)
# vim: shiftwidth=4 tabstop=4 expandtab
|