common/tal.py
author sylvain.thenault@logilab.fr
Thu, 14 May 2009 12:49:44 +0200
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"""provides simpleTAL extensions for CubicWeb
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:organization: Logilab
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:copyright: 2001-2008 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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__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  
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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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        # 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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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, unierror:
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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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    """
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    string_buffer = StringIO(template)
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    compiler = CubicWebTemplateCompiler()
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    compiler.parseTemplate(string_buffer) # , inputEncoding='unicode')
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    return compiler.getTemplate()
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def compile_template_file(filepath):
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    """compiles a TAL template file
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    :type filepath: str
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    :param template: path of the file to compile 
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    """
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    fp = file(filepath)
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    file_content = unicode(fp.read()) # template file should be pure ASCII
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    fp.close()
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    return compile_template(file_content)
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def evaluatePython (self, expr):
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    if not self.allowPythonPath:
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        return self.false
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    globals = {}
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    for name, value in self.globals.items():
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        if isinstance (value, simpleTALES.ContextVariable):
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            value = value.rawValue()
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        globals[name] = value
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    globals['path'] = self.pythonPathFuncs.path
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    globals['string'] = self.pythonPathFuncs.string
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    globals['exists'] = self.pythonPathFuncs.exists
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    globals['nocall'] = self.pythonPathFuncs.nocall
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    globals['test'] = self.pythonPathFuncs.test
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   211
    locals = {}
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    for name, value in self.locals.items():
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        if (isinstance (value, simpleTALES.ContextVariable)):
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            value = value.rawValue()
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        locals[name] = value
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   216
    # XXX precompile expr will avoid late syntax error
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    try:
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        result = eval(expr, globals, locals)
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   219
    except Exception, ex:
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        ex = ex.__class__('in %r: %s' % (expr, ex))
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        raise ex, None, sys.exc_info()[-1]
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    if (isinstance (result, simpleTALES.ContextVariable)):
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   223
        return result.value()
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   224
    return result
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simpleTALES.Context.evaluatePython = evaluatePython
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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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##             # print "[tal.py] just for tests..."
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##             # get parent frame
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##             directory = osp.abspath(osp.dirname(sys._getframe(1).f_globals['__file__']))
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##             filepath = osp.join(directory, filepath)
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        self.filename = filename
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        self.write = write
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   238
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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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   243
            if self.write:
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                instance.w(html)
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            else:
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   246
                return html
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   247
        return wrapped
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   248
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    def _compiled_template(self, instance):
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   250
        for fileordirectory in instance.config.vregistry_path():
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   251
            filepath = join(fileordirectory, self.filename)
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   252
            if isdir(fileordirectory) and exists(filepath):
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   253
                return compile_template_file(filepath)
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   254
        raise Exception('no such template %s' % self.filename)
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    _compiled_template = cached(_compiled_template, 0)
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   256