ext/tal.py
author Aurelien Campeas <aurelien.campeas@logilab.fr>
Wed, 03 Jul 2013 14:33:27 +0200
branchstable
changeset 9130 0f1504a9fb51
parent 8695 358d8bed9626
child 10590 7629902e7554
permissions -rw-r--r--
[constraint] more robust unicity constraint failures reporting for end-users Postgres or Sqlserver have limits on the index names (around resp. 64 and 128 characters). Because `logilab.database` encodes the `unique together` constraint rtypes in the index names, we sometimes get truncated index names, from which it is impossible to retrieve all rtypes. In the long run, the way such index are named should be changed. In the short term, we try to reduce the end-user confusion resulting from this design flaw: * in source/native, the regex filtering ``IntegrityError`` message does not impose an `_idx` suffix, which indeed may be absent (the result being an UI message that resembles a catastrophic failure), * also we avoid including a trailing " (double quote) from the error message * in entities/adapters, the well-named ``IUserFriendly`` adapter is made a bit smarter about how to handle missing rtypes. * the adapter also always produces a global message explaining the issue (and the fact that sometimes, the user is not shown all the relevant info) * i18n is updated Closes #2793789
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# copyright 2003-2012 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""provides simpleTAL extensions for CubicWeb
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"""
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__docformat__ = "restructuredtext en"
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import sys
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import re
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from os.path import exists, isdir, join
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from logging import getLogger
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from StringIO import StringIO
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from simpletal import simpleTAL, simpleTALES
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from logilab.common.decorators import cached
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LOGGER = getLogger('cubicweb.tal')
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class LoggerAdapter(object):
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    def __init__(self, tal_logger):
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        self.tal_logger = tal_logger
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    def debug(self, msg):
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        LOGGER.debug(msg)
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    def warn(self, msg):
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        LOGGER.warning(msg)
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    def __getattr__(self, attrname):
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        return getattr(self.tal_logger, attrname)
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class CubicWebContext(simpleTALES.Context):
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    """add facilities to access entity / resultset"""
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    def __init__(self, options=None, allowPythonPath=1):
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        simpleTALES.Context.__init__(self, options, allowPythonPath)
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        self.log = LoggerAdapter(self.log)
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    def update(self, context):
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        for varname, value in context.items():
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            self.addGlobal(varname, value)
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    def addRepeat(self, name, var, initialValue):
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        simpleTALES.Context.addRepeat(self, name, var, initialValue)
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# XXX FIXME need to find a clean to define OPCODE values for extensions
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I18N_CONTENT = 18
0
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I18N_REPLACE = 19
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RQL_EXECUTE  = 20
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# simpleTAL uses the OPCODE values to define priority over commands.
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# TAL_ITER should have the same priority than TAL_REPEAT (i.e. 3), but
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# we can't use the same OPCODE for two different commands without changing
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# the simpleTAL implementation. Another solution would be to totally override
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# the REPEAT implementation with the ITER one, but some specific operations
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# (involving len() for instance) are not implemented for ITER, so we prefer
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# to keep both implementations for now, and to fool simpleTAL by using a float
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# number between 3 and 4
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TAL_ITER     = 3.1
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# FIX simpleTAL HTML 4.01 stupidity
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# (simpleTAL never closes tags like INPUT, IMG, HR ...)
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simpleTAL.HTML_FORBIDDEN_ENDTAG.clear()
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class CubicWebTemplateCompiler(simpleTAL.HTMLTemplateCompiler):
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    """extends default compiler by adding i18n:content commands"""
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    def __init__(self):
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        simpleTAL.HTMLTemplateCompiler.__init__(self)
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        self.commandHandler[I18N_CONTENT] = self.compile_cmd_i18n_content
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        self.commandHandler[I18N_REPLACE] = self.compile_cmd_i18n_replace
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        self.commandHandler[RQL_EXECUTE] = self.compile_cmd_rql
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        self.commandHandler[TAL_ITER] = self.compile_cmd_tal_iter
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    def setTALPrefix(self, prefix):
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        simpleTAL.TemplateCompiler.setTALPrefix(self, prefix)
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        self.tal_attribute_map['i18n:content'] = I18N_CONTENT
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        self.tal_attribute_map['i18n:replace'] = I18N_REPLACE
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        self.tal_attribute_map['rql:execute'] = RQL_EXECUTE
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        self.tal_attribute_map['tal:iter'] = TAL_ITER
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    def compile_cmd_i18n_content(self, argument):
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        # XXX tal:content structure=, text= should we support this ?
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        structure_flag = 0
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        return (I18N_CONTENT, (argument, False, structure_flag, self.endTagSymbol))
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    def compile_cmd_i18n_replace(self, argument):
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        # XXX tal:content structure=, text= should we support this ?
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        structure_flag = 0
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        return (I18N_CONTENT, (argument, True, structure_flag, self.endTagSymbol))
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    def compile_cmd_rql(self, argument):
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        return (RQL_EXECUTE, (argument, self.endTagSymbol))
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    def compile_cmd_tal_iter(self, argument):
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        original_id, (var_name, expression, end_tag_symbol) = \
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                     simpleTAL.HTMLTemplateCompiler.compileCmdRepeat(self, argument)
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        return (TAL_ITER, (var_name, expression, self.endTagSymbol))
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    def getTemplate(self):
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        return CubicWebTemplate(self.commandList, self.macroMap, self.symbolLocationTable)
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    def compileCmdAttributes (self, argument):
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        """XXX modified to support single attribute
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        definition ending by a ';'
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        backport this to simpleTAL
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        """
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        # Compile tal:attributes into attribute command
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        # Argument: [(attributeName, expression)]
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0
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        # Break up the list of attribute settings first
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        commandArgs = []
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        # We only want to match semi-colons that are not escaped
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        argumentSplitter =  re.compile(r'(?<!;);(?!;)')
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        for attributeStmt in argumentSplitter.split(argument):
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            if not attributeStmt.strip():
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                continue
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            #  remove any leading space and un-escape any semi-colons
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            attributeStmt = attributeStmt.lstrip().replace(';;', ';')
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            # Break each attributeStmt into name and expression
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            stmtBits = attributeStmt.split(' ')
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            if (len (stmtBits) < 2):
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                # Error, badly formed attributes command
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                msg = "Badly formed attributes command '%s'.  Attributes commands must be of the form: 'name expression[;name expression]'" % argument
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                self.log.error(msg)
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                raise simpleTAL.TemplateParseException(self.tagAsText(self.currentStartTag), msg)
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            attName = stmtBits[0]
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            attExpr = " ".join(stmtBits[1:])
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            commandArgs.append((attName, attExpr))
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        return (simpleTAL.TAL_ATTRIBUTES, commandArgs)
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class CubicWebTemplateInterpreter(simpleTAL.TemplateInterpreter):
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    """provides implementation for interpreting cubicweb extensions"""
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    def __init__(self):
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        simpleTAL.TemplateInterpreter.__init__(self)
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        self.commandHandler[I18N_CONTENT] = self.cmd_i18n
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        self.commandHandler[TAL_ITER] = self.cmdRepeat
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        # self.commandHandler[RQL_EXECUTE] = self.cmd_rql
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    def cmd_i18n(self, command, args):
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        """i18n:content and i18n:replace implementation"""
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        string, replace_flag, structure_flag, end_symbol = args
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        if replace_flag:
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            self.outputTag = 0
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        result = self.context.globals['_'](string)
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        self.tagContent = (0, result)
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        self.movePCForward = self.symbolTable[end_symbol]
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        self.programCounter += 1
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   171
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class CubicWebTemplate(simpleTAL.HTMLTemplate):
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    """overrides HTMLTemplate.expand() to systematically use CubicWebInterpreter
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    """
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    def expand(self, context, outputFile):
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        interpreter = CubicWebTemplateInterpreter()
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        interpreter.initialise(context, outputFile)
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        simpleTAL.HTMLTemplate.expand(self, context, outputFile,# outputEncoding='unicode',
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                                      interpreter=interpreter)
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    def expandInline(self, context, outputFile, interpreter):
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        """ Internally used when expanding a template that is part of a context."""
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        try:
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            interpreter.execute(self)
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        except UnicodeError as unierror:
0
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            LOGGER.exception(str(unierror))
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            raise simpleTALES.ContextContentException("found non-unicode %r string in Context!" % unierror.args[1]), None, sys.exc_info()[-1]
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def compile_template(template):
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    """compiles a TAL template string
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    :type template: unicode
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    :param template: a TAL-compliant template string
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   194
    """
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    string_buffer = StringIO(template)
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   196
    compiler = CubicWebTemplateCompiler()
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   197
    compiler.parseTemplate(string_buffer) # , inputEncoding='unicode')
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   198
    return compiler.getTemplate()
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   200
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   201
def compile_template_file(filepath):
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    """compiles a TAL template file
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   203
    :type filepath: str
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    :param template: path of the file to compile
0
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   205
    """
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   206
    fp = file(filepath)
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   207
    file_content = unicode(fp.read()) # template file should be pure ASCII
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   208
    fp.close()
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   209
    return compile_template(file_content)
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   210
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   211
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   212
def evaluatePython (self, expr):
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   213
    if not self.allowPythonPath:
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   214
        return self.false
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   215
    globals = {}
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   216
    for name, value in self.globals.items():
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   217
        if isinstance (value, simpleTALES.ContextVariable):
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   218
            value = value.rawValue()
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        globals[name] = value
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    globals['path'] = self.pythonPathFuncs.path
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   221
    globals['string'] = self.pythonPathFuncs.string
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   222
    globals['exists'] = self.pythonPathFuncs.exists
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   223
    globals['nocall'] = self.pythonPathFuncs.nocall
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   224
    globals['test'] = self.pythonPathFuncs.test
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   225
    locals = {}
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   226
    for name, value in self.locals.items():
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        if (isinstance (value, simpleTALES.ContextVariable)):
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   228
            value = value.rawValue()
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   229
        locals[name] = value
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   230
    # XXX precompile expr will avoid late syntax error
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   231
    try:
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   232
        result = eval(expr, globals, locals)
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   233
    except Exception as ex:
0
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   234
        ex = ex.__class__('in %r: %s' % (expr, ex))
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   235
        raise ex, None, sys.exc_info()[-1]
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   236
    if (isinstance (result, simpleTALES.ContextVariable)):
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   237
        return result.value()
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   238
    return result
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   239
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simpleTALES.Context.evaluatePython = evaluatePython
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   241
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   242
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   243
class talbased(object):
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    def __init__(self, filename, write=True):
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##         if not osp.isfile(filepath):
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   246
##             # print "[tal.py] just for tests..."
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   247
##             # get parent frame
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   248
##             directory = osp.abspath(osp.dirname(sys._getframe(1).f_globals['__file__']))
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   249
##             filepath = osp.join(directory, filepath)
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   250
        self.filename = filename
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   251
        self.write = write
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    def __call__(self, viewfunc):
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        def wrapped(instance, *args, **kwargs):
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            variables = viewfunc(instance, *args, **kwargs)
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            html = instance.tal_render(self._compiled_template(instance), variables)
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            if self.write:
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                instance.w(html)
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            else:
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                return html
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        return wrapped
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    def _compiled_template(self, instance):
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        for fileordirectory in instance.config.appobjects_path():
0
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            filepath = join(fileordirectory, self.filename)
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            if isdir(fileordirectory) and exists(filepath):
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                return compile_template_file(filepath)
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        raise Exception('no such template %s' % self.filename)
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    _compiled_template = cached(_compiled_template, 0)