375 lines
12 KiB
Python
375 lines
12 KiB
Python
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# mako/exceptions.py
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# Copyright (C) 2006-2013 the Mako authors and contributors <see AUTHORS file>
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#
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# This module is part of Mako and is released under
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# the MIT License: http://www.opensource.org/licenses/mit-license.php
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"""exception classes"""
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import traceback
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import sys
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import re
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from mako import util, compat
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class MakoException(Exception):
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pass
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class RuntimeException(MakoException):
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pass
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def _format_filepos(lineno, pos, filename):
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if filename is None:
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return " at line: %d char: %d" % (lineno, pos)
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else:
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return " in file '%s' at line: %d char: %d" % (filename, lineno, pos)
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class CompileException(MakoException):
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def __init__(self, message, source, lineno, pos, filename):
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MakoException.__init__(self,
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message + _format_filepos(lineno, pos, filename))
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self.lineno =lineno
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self.pos = pos
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self.filename = filename
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self.source = source
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class SyntaxException(MakoException):
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def __init__(self, message, source, lineno, pos, filename):
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MakoException.__init__(self,
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message + _format_filepos(lineno, pos, filename))
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self.lineno =lineno
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self.pos = pos
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self.filename = filename
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self.source = source
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class UnsupportedError(MakoException):
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"""raised when a retired feature is used."""
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class NameConflictError(MakoException):
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"""raised when a reserved word is used inappropriately"""
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class TemplateLookupException(MakoException):
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pass
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class TopLevelLookupException(TemplateLookupException):
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pass
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class RichTraceback(object):
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"""Pull the current exception from the ``sys`` traceback and extracts
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Mako-specific template information.
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See the usage examples in :ref:`handling_exceptions`.
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"""
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def __init__(self, error=None, traceback=None):
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self.source, self.lineno = "", 0
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if error is None or traceback is None:
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t, value, tback = sys.exc_info()
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if error is None:
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error = value or t
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if traceback is None:
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traceback = tback
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self.error = error
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self.records = self._init(traceback)
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if isinstance(self.error, (CompileException, SyntaxException)):
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import mako.template
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self.source = self.error.source
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self.lineno = self.error.lineno
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self._has_source = True
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self._init_message()
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@property
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def errorname(self):
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return compat.exception_name(self.error)
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def _init_message(self):
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"""Find a unicode representation of self.error"""
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try:
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self.message = compat.text_type(self.error)
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except UnicodeError:
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try:
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self.message = str(self.error)
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except UnicodeEncodeError:
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# Fallback to args as neither unicode nor
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# str(Exception(u'\xe6')) work in Python < 2.6
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self.message = self.error.args[0]
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if not isinstance(self.message, compat.text_type):
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self.message = compat.text_type(self.message, 'ascii', 'replace')
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def _get_reformatted_records(self, records):
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for rec in records:
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if rec[6] is not None:
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yield (rec[4], rec[5], rec[2], rec[6])
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else:
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yield tuple(rec[0:4])
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@property
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def traceback(self):
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"""Return a list of 4-tuple traceback records (i.e. normal python
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format) with template-corresponding lines remapped to the originating
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template.
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"""
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return list(self._get_reformatted_records(self.records))
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@property
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def reverse_records(self):
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return reversed(self.records)
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@property
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def reverse_traceback(self):
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"""Return the same data as traceback, except in reverse order.
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"""
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return list(self._get_reformatted_records(self.reverse_records))
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def _init(self, trcback):
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"""format a traceback from sys.exc_info() into 7-item tuples,
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containing the regular four traceback tuple items, plus the original
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template filename, the line number adjusted relative to the template
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source, and code line from that line number of the template."""
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import mako.template
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mods = {}
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rawrecords = traceback.extract_tb(trcback)
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new_trcback = []
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for filename, lineno, function, line in rawrecords:
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if not line:
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line = ''
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try:
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(line_map, template_lines) = mods[filename]
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except KeyError:
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try:
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info = mako.template._get_module_info(filename)
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module_source = info.code
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template_source = info.source
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template_filename = info.template_filename or filename
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except KeyError:
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# A normal .py file (not a Template)
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if not compat.py3k:
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try:
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fp = open(filename, 'rb')
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encoding = util.parse_encoding(fp)
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fp.close()
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except IOError:
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encoding = None
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if encoding:
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line = line.decode(encoding)
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else:
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line = line.decode('ascii', 'replace')
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new_trcback.append((filename, lineno, function, line,
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None, None, None, None))
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continue
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template_ln = module_ln = 1
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line_map = {}
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for line in module_source.split("\n"):
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match = re.match(r'\s*# SOURCE LINE (\d+)', line)
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if match:
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template_ln = int(match.group(1))
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module_ln += 1
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line_map[module_ln] = template_ln
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template_lines = [line for line in
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template_source.split("\n")]
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mods[filename] = (line_map, template_lines)
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template_ln = line_map[lineno]
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if template_ln <= len(template_lines):
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template_line = template_lines[template_ln - 1]
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else:
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template_line = None
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new_trcback.append((filename, lineno, function,
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line, template_filename, template_ln,
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template_line, template_source))
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if not self.source:
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for l in range(len(new_trcback)-1, 0, -1):
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if new_trcback[l][5]:
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self.source = new_trcback[l][7]
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self.lineno = new_trcback[l][5]
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break
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else:
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if new_trcback:
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try:
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# A normal .py file (not a Template)
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fp = open(new_trcback[-1][0], 'rb')
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encoding = util.parse_encoding(fp)
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fp.seek(0)
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self.source = fp.read()
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fp.close()
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if encoding:
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self.source = self.source.decode(encoding)
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except IOError:
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self.source = ''
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self.lineno = new_trcback[-1][1]
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return new_trcback
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def text_error_template(lookup=None):
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"""Provides a template that renders a stack trace in a similar format to
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the Python interpreter, substituting source template filenames, line
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numbers and code for that of the originating source template, as
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applicable.
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"""
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import mako.template
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return mako.template.Template(r"""
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<%page args="error=None, traceback=None"/>
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<%!
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from mako.exceptions import RichTraceback
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%>\
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<%
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tback = RichTraceback(error=error, traceback=traceback)
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%>\
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Traceback (most recent call last):
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% for (filename, lineno, function, line) in tback.traceback:
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File "${filename}", line ${lineno}, in ${function or '?'}
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${line | trim}
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% endfor
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${tback.errorname}: ${tback.message}
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""")
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def _install_pygments():
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global syntax_highlight, pygments_html_formatter
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from mako.ext.pygmentplugin import syntax_highlight,\
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pygments_html_formatter
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def _install_fallback():
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global syntax_highlight, pygments_html_formatter
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from mako.filters import html_escape
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pygments_html_formatter = None
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def syntax_highlight(filename='', language=None):
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return html_escape
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def _install_highlighting():
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try:
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_install_pygments()
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except ImportError:
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_install_fallback()
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_install_highlighting()
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def html_error_template():
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"""Provides a template that renders a stack trace in an HTML format,
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providing an excerpt of code as well as substituting source template
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filenames, line numbers and code for that of the originating source
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template, as applicable.
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The template's default ``encoding_errors`` value is ``'htmlentityreplace'``. The
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template has two options. With the ``full`` option disabled, only a section of
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an HTML document is returned. With the ``css`` option disabled, the default
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stylesheet won't be included.
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"""
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import mako.template
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return mako.template.Template(r"""
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<%!
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from mako.exceptions import RichTraceback, syntax_highlight,\
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pygments_html_formatter
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%>
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<%page args="full=True, css=True, error=None, traceback=None"/>
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% if full:
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<html>
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<head>
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<title>Mako Runtime Error</title>
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% endif
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% if css:
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<style>
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body { font-family:verdana; margin:10px 30px 10px 30px;}
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.stacktrace { margin:5px 5px 5px 5px; }
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.highlight { padding:0px 10px 0px 10px; background-color:#9F9FDF; }
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.nonhighlight { padding:0px; background-color:#DFDFDF; }
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.sample { padding:10px; margin:10px 10px 10px 10px;
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font-family:monospace; }
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.sampleline { padding:0px 10px 0px 10px; }
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.sourceline { margin:5px 5px 10px 5px; font-family:monospace;}
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.location { font-size:80%; }
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.highlight { white-space:pre; }
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.sampleline { white-space:pre; }
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% if pygments_html_formatter:
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${pygments_html_formatter.get_style_defs()}
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.linenos { min-width: 2.5em; text-align: right; }
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pre { margin: 0; }
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.syntax-highlighted { padding: 0 10px; }
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.syntax-highlightedtable { border-spacing: 1px; }
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.nonhighlight { border-top: 1px solid #DFDFDF;
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border-bottom: 1px solid #DFDFDF; }
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.stacktrace .nonhighlight { margin: 5px 15px 10px; }
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.sourceline { margin: 0 0; font-family:monospace; }
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.code { background-color: #F8F8F8; width: 100%; }
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.error .code { background-color: #FFBDBD; }
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.error .syntax-highlighted { background-color: #FFBDBD; }
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% endif
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</style>
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% endif
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% if full:
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</head>
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<body>
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% endif
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<h2>Error !</h2>
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<%
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tback = RichTraceback(error=error, traceback=traceback)
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src = tback.source
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line = tback.lineno
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if src:
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lines = src.split('\n')
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else:
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lines = None
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%>
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<h3>${tback.errorname}: ${tback.message|h}</h3>
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% if lines:
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<div class="sample">
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<div class="nonhighlight">
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% for index in range(max(0, line-4),min(len(lines), line+5)):
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<%
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if pygments_html_formatter:
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pygments_html_formatter.linenostart = index + 1
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%>
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% if index + 1 == line:
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<%
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if pygments_html_formatter:
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old_cssclass = pygments_html_formatter.cssclass
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pygments_html_formatter.cssclass = 'error ' + old_cssclass
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%>
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${lines[index] | syntax_highlight(language='mako')}
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<%
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if pygments_html_formatter:
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pygments_html_formatter.cssclass = old_cssclass
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%>
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% else:
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${lines[index] | syntax_highlight(language='mako')}
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% endif
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% endfor
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</div>
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</div>
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% endif
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<div class="stacktrace">
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% for (filename, lineno, function, line) in tback.reverse_traceback:
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<div class="location">${filename}, line ${lineno}:</div>
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<div class="nonhighlight">
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<%
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if pygments_html_formatter:
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pygments_html_formatter.linenostart = lineno
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%>
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<div class="sourceline">${line | syntax_highlight(filename)}</div>
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</div>
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% endfor
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</div>
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% if full:
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</body>
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</html>
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% endif
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""", output_encoding=sys.getdefaultencoding(),
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encoding_errors='htmlentityreplace')
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