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New Chameleon templating engine, engine is now configurable. We now have two configurable templating engines, the old Zope TAL templates (called zopetal in the config) and the new Chameleon (called chameleon in the config). A new config-option "template_engine" under [main] can take these config-options, the default is zopetal. Thanks to Cheer Xiao for the idea of making this configurable *and* for the actual implementation! Cheer Xiao commit log: - The original TAL engine ported from Zope is thereafter referred to as "zopetal", in speech and in code - A new option "template_engine" under [main] introduced - Zopetal-specific code stripped from cgi/templating.py to form the new cgi/engine_zopetal.py - Interface to Chameleon in cgi/engine_chameleon.py - Engines are supposed to provide a Templates class that mimics the behavior of the old cgi.templating.Templates. The Templates class is preferably subclassed from cgi.templating.TemplatesBase. - New function cgi.templating.get_templates to get the appropriate engine's Templates instance according to the engine name
author Ralf Schlatterbeck <rsc@runtux.com>
date Thu, 23 Feb 2012 18:10:03 +0100
parents 6e3e4f24c753
children 64b05e24dbd8
line wrap: on
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#
# This module was written by Ka-Ping Yee, <ping@lfw.org>.
#

"""Extended CGI traceback handler by Ka-Ping Yee, <ping@lfw.org>.
"""
__docformat__ = 'restructuredtext'

import sys, os, types, string, keyword, linecache, tokenize, inspect, cgi
import pydoc, traceback

from roundup.cgi import templating, TranslationService

def get_translator(i18n=None):
    """Return message translation function (gettext)

    Parameters:
        i18n - translation service, such as roundup.i18n module
            or TranslationService object.

    Return ``gettext`` attribute of the ``i18n`` object, if available
    (must be a message translation function with one argument).
    If ``gettext`` cannot be obtained from ``i18n``, take default
    TranslationService.

    """
    try:
        return i18n.gettext
    except:
        return TranslationService.get_translation().gettext

def breaker():
    return ('<body bgcolor="white">' +
            '<font color="white" size="-5"> > </font> ' +
            '</table>' * 5)

def niceDict(indent, dict):
    l = []
    for k in sorted(dict):
        v = dict[k]
        l.append('<tr><td><strong>%s</strong></td><td>%s</td></tr>'%(k,
            cgi.escape(repr(v))))
    return '\n'.join(l)

def pt_html(context=5, i18n=None):
    _ = get_translator(i18n)
    esc = cgi.escape
    exc_info = [esc(str(value)) for value in sys.exc_info()[:2]]
    l = [_('<h1>Templating Error</h1>\n'
            '<p><b>%(exc_type)s</b>: %(exc_value)s</p>\n'
            '<p class="help">Debugging information follows</p>'
         ) % {'exc_type': exc_info[0], 'exc_value': exc_info[1]},
         '<ol>',]
    from roundup.cgi.PageTemplates.Expressions import TraversalError
    t = inspect.trace(context)
    t.reverse()
    for frame, file, lnum, func, lines, index in t:
        args, varargs, varkw, locals = inspect.getargvalues(frame)
        if '__traceback_info__' in locals:
            ti = locals['__traceback_info__']
            if isinstance(ti, TraversalError):
                s = []
                for name, info in ti.path:
                    s.append(_('<li>"%(name)s" (%(info)s)</li>')
                        % {'name': name, 'info': esc(repr(info))})
                s = '\n'.join(s)
                l.append(_('<li>Looking for "%(name)s", '
                    'current path:<ol>%(path)s</ol></li>'
                ) % {'name': ti.name, 'path': s})
            else:
                l.append(_('<li>In %s</li>') % esc(str(ti)))
        if '__traceback_supplement__' in locals:
            ts = locals['__traceback_supplement__']
            if len(ts) == 2:
                supp, context = ts
                s = _('A problem occurred in your template "%s".') \
                    % str(context.id)
                if context._v_errors:
                    s = s + '<br>' + '<br>'.join(
                        [esc(x) for x in context._v_errors])
                l.append('<li>%s</li>'%s)
            elif len(ts) == 3:
                supp, context, info = ts
                l.append(_('''
<li>While evaluating the %(info)r expression on line %(line)d
<table class="otherinfo" style="font-size: 90%%">
 <tr><th colspan="2" class="header">Current variables:</th></tr>
 %(globals)s
 %(locals)s
</table></li>
''') % {
    'info': info,
    'line': context.position[0],
    'globals': niceDict('    ', context.global_vars),
    'locals': niceDict('    ', context.local_vars)
})

    l.append('''
</ol>
<table style="font-size: 80%%; color: gray">
 <tr><th class="header" align="left">%s</th></tr>
 <tr><td><pre>%s</pre></td></tr>
</table>''' % (_('Full traceback:'), cgi.escape(''.join(
        traceback.format_exception(*sys.exc_info())
    ))))
    l.append('<p>&nbsp;</p>')
    return '\n'.join(l)

def html(context=5, i18n=None):
    _ = get_translator(i18n)
    etype, evalue = sys.exc_info()[0], sys.exc_info()[1]
    if type(etype) is type:
        etype = etype.__name__
    pyver = 'Python ' + string.split(sys.version)[0] + '<br>' + sys.executable
    head = pydoc.html.heading(
        _('<font size=+1><strong>%(exc_type)s</strong>: %(exc_value)s</font>')
        % {'exc_type': etype, 'exc_value': evalue},
        '#ffffff', '#777777', pyver)

    head = head + (_('<p>A problem occurred while running a Python script. '
                   'Here is the sequence of function calls leading up to '
                   'the error, with the most recent (innermost) call first. '
                   'The exception attributes are:'))

    indent = '<tt><small>%s</small>&nbsp;</tt>' % ('&nbsp;' * 5)
    traceback = []
    for frame, file, lnum, func, lines, index in inspect.trace(context):
        if file is None:
            link = _("&lt;file is None - probably inside <tt>eval</tt> "
                "or <tt>exec</tt>&gt;")
        else:
            file = os.path.abspath(file)
            link = '<a href="file:%s">%s</a>' % (file, pydoc.html.escape(file))
        args, varargs, varkw, locals = inspect.getargvalues(frame)
        if func == '?':
            call = ''
        else:
            call = _('in <strong>%s</strong>') % func + inspect.formatargvalues(
                    args, varargs, varkw, locals,
                    formatvalue=lambda value: '=' + pydoc.html.repr(value))

        level = '''
<table width="100%%" bgcolor="#dddddd" cellspacing=0 cellpadding=2 border=0>
<tr><td>%s %s</td></tr></table>''' % (link, call)

        if index is None or file is None:
            traceback.append('<p>' + level)
            continue

        # do a file inspection
        names = []
        def tokeneater(type, token, start, end, line, names=names):
            if type == tokenize.NAME and token not in keyword.kwlist:
                if token not in names:
                    names.append(token)
            if type == tokenize.NEWLINE: raise IndexError
        def linereader(file=file, lnum=[lnum]):
            line = linecache.getline(file, lnum[0])
            lnum[0] = lnum[0] + 1
            return line

        try:
            tokenize.tokenize(linereader, tokeneater)
        except IndexError:
            pass
        lvals = []
        for name in names:
            if name in frame.f_code.co_varnames:
                if name in locals:
                    value = pydoc.html.repr(locals[name])
                else:
                    value = _('<em>undefined</em>')
                name = '<strong>%s</strong>' % name
            else:
                if name in frame.f_globals:
                    value = pydoc.html.repr(frame.f_globals[name])
                else:
                    value = _('<em>undefined</em>')
                name = '<em>global</em> <strong>%s</strong>' % name
            lvals.append('%s&nbsp;= %s'%(name, value))
        if lvals:
            lvals = string.join(lvals, ', ')
            lvals = indent + '<small><font color="#909090">%s'\
                '</font></small><br>'%lvals
        else:
            lvals = ''

        excerpt = []
        i = lnum - index
        for line in lines:
            number = '&nbsp;' * (5-len(str(i))) + str(i)
            number = '<small><font color="#909090">%s</font></small>' % number
            line = '<tt>%s&nbsp;%s</tt>' % (number, pydoc.html.preformat(line))
            if i == lnum:
                line = '''
<table width="100%%" bgcolor="white" cellspacing=0 cellpadding=0 border=0>
<tr><td>%s</td></tr></table>''' % line
            excerpt.append('\n' + line)
            if i == lnum:
                excerpt.append(lvals)
            i = i + 1
        traceback.append('<p>' + level + string.join(excerpt, '\n'))

    traceback.reverse()

    exception = '<p><strong>%s</strong>: %s' % (str(etype), str(evalue))
    attribs = []
    if type(evalue) is types.InstanceType:
        for name in dir(evalue):
            value = pydoc.html.repr(getattr(evalue, name))
            attribs.append('<br>%s%s&nbsp;= %s' % (indent, name, value))

    return head + string.join(attribs) + string.join(traceback) + '<p>&nbsp;</p>'

def handler():
    print breaker()
    print html()

# vim: set filetype=python ts=4 sw=4 et si :
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