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annotate venv/lib/python2.7/site-packages/jinja2/debug.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 # -*- coding: utf-8 -*-
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2 """
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3 jinja2.debug
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4 ~~~~~~~~~~~~
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5
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6 Implements the debug interface for Jinja. This module does some pretty
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7 ugly stuff with the Python traceback system in order to achieve tracebacks
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8 with correct line numbers, locals and contents.
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9
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10 :copyright: (c) 2010 by the Jinja Team.
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11 :license: BSD, see LICENSE for more details.
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12 """
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13 import sys
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14 import traceback
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15 from types import TracebackType, CodeType
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16 from jinja2.utils import missing, internal_code
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17 from jinja2.exceptions import TemplateSyntaxError
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18 from jinja2._compat import iteritems, reraise, PY2
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19
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20 # on pypy we can take advantage of transparent proxies
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21 try:
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22 from __pypy__ import tproxy
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23 except ImportError:
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24 tproxy = None
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25
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26
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27 # how does the raise helper look like?
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28 try:
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29 exec("raise TypeError, 'foo'")
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30 except SyntaxError:
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31 raise_helper = 'raise __jinja_exception__[1]'
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32 except TypeError:
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33 raise_helper = 'raise __jinja_exception__[0], __jinja_exception__[1]'
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34
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35
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36 class TracebackFrameProxy(object):
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37 """Proxies a traceback frame."""
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38
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39 def __init__(self, tb):
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40 self.tb = tb
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41 self._tb_next = None
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42
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43 @property
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44 def tb_next(self):
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45 return self._tb_next
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46
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47 def set_next(self, next):
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48 if tb_set_next is not None:
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49 try:
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50 tb_set_next(self.tb, next and next.tb or None)
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51 except Exception:
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52 # this function can fail due to all the hackery it does
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53 # on various python implementations. We just catch errors
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54 # down and ignore them if necessary.
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55 pass
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56 self._tb_next = next
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57
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58 @property
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59 def is_jinja_frame(self):
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60 return '__jinja_template__' in self.tb.tb_frame.f_globals
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61
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62 def __getattr__(self, name):
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63 return getattr(self.tb, name)
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64
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65
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66 def make_frame_proxy(frame):
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67 proxy = TracebackFrameProxy(frame)
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68 if tproxy is None:
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69 return proxy
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70 def operation_handler(operation, *args, **kwargs):
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71 if operation in ('__getattribute__', '__getattr__'):
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72 return getattr(proxy, args[0])
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73 elif operation == '__setattr__':
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74 proxy.__setattr__(*args, **kwargs)
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75 else:
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76 return getattr(proxy, operation)(*args, **kwargs)
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77 return tproxy(TracebackType, operation_handler)
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78
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79
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80 class ProcessedTraceback(object):
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81 """Holds a Jinja preprocessed traceback for printing or reraising."""
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82
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83 def __init__(self, exc_type, exc_value, frames):
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84 assert frames, 'no frames for this traceback?'
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85 self.exc_type = exc_type
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86 self.exc_value = exc_value
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87 self.frames = frames
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88
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89 # newly concatenate the frames (which are proxies)
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90 prev_tb = None
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91 for tb in self.frames:
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92 if prev_tb is not None:
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93 prev_tb.set_next(tb)
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94 prev_tb = tb
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95 prev_tb.set_next(None)
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96
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97 def render_as_text(self, limit=None):
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98 """Return a string with the traceback."""
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99 lines = traceback.format_exception(self.exc_type, self.exc_value,
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100 self.frames[0], limit=limit)
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101 return ''.join(lines).rstrip()
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102
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103 def render_as_html(self, full=False):
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104 """Return a unicode string with the traceback as rendered HTML."""
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105 from jinja2.debugrenderer import render_traceback
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106 return u'%s\n\n<!--\n%s\n-->' % (
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107 render_traceback(self, full=full),
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108 self.render_as_text().decode('utf-8', 'replace')
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109 )
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110
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111 @property
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112 def is_template_syntax_error(self):
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113 """`True` if this is a template syntax error."""
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114 return isinstance(self.exc_value, TemplateSyntaxError)
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115
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116 @property
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117 def exc_info(self):
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118 """Exception info tuple with a proxy around the frame objects."""
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119 return self.exc_type, self.exc_value, self.frames[0]
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120
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121 @property
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122 def standard_exc_info(self):
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123 """Standard python exc_info for re-raising"""
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124 tb = self.frames[0]
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125 # the frame will be an actual traceback (or transparent proxy) if
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126 # we are on pypy or a python implementation with support for tproxy
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127 if type(tb) is not TracebackType:
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128 tb = tb.tb
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129 return self.exc_type, self.exc_value, tb
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130
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131
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132 def make_traceback(exc_info, source_hint=None):
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133 """Creates a processed traceback object from the exc_info."""
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134 exc_type, exc_value, tb = exc_info
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135 if isinstance(exc_value, TemplateSyntaxError):
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136 exc_info = translate_syntax_error(exc_value, source_hint)
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137 initial_skip = 0
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138 else:
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139 initial_skip = 1
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140 return translate_exception(exc_info, initial_skip)
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141
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142
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143 def translate_syntax_error(error, source=None):
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144 """Rewrites a syntax error to please traceback systems."""
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145 error.source = source
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146 error.translated = True
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147 exc_info = (error.__class__, error, None)
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148 filename = error.filename
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149 if filename is None:
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150 filename = '<unknown>'
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151 return fake_exc_info(exc_info, filename, error.lineno)
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152
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153
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154 def translate_exception(exc_info, initial_skip=0):
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155 """If passed an exc_info it will automatically rewrite the exceptions
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156 all the way down to the correct line numbers and frames.
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157 """
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158 tb = exc_info[2]
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159 frames = []
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160
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161 # skip some internal frames if wanted
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162 for x in range(initial_skip):
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163 if tb is not None:
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164 tb = tb.tb_next
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165 initial_tb = tb
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166
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167 while tb is not None:
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168 # skip frames decorated with @internalcode. These are internal
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169 # calls we can't avoid and that are useless in template debugging
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170 # output.
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171 if tb.tb_frame.f_code in internal_code:
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172 tb = tb.tb_next
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173 continue
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174
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175 # save a reference to the next frame if we override the current
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176 # one with a faked one.
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177 next = tb.tb_next
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178
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179 # fake template exceptions
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180 template = tb.tb_frame.f_globals.get('__jinja_template__')
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181 if template is not None:
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182 lineno = template.get_corresponding_lineno(tb.tb_lineno)
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183 tb = fake_exc_info(exc_info[:2] + (tb,), template.filename,
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184 lineno)[2]
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185
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186 frames.append(make_frame_proxy(tb))
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187 tb = next
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188
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189 # if we don't have any exceptions in the frames left, we have to
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190 # reraise it unchanged.
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191 # XXX: can we backup here? when could this happen?
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192 if not frames:
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193 reraise(exc_info[0], exc_info[1], exc_info[2])
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194
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195 return ProcessedTraceback(exc_info[0], exc_info[1], frames)
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196
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197
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198 def fake_exc_info(exc_info, filename, lineno):
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199 """Helper for `translate_exception`."""
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200 exc_type, exc_value, tb = exc_info
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201
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202 # figure the real context out
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203 if tb is not None:
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204 real_locals = tb.tb_frame.f_locals.copy()
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205 ctx = real_locals.get('context')
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206 if ctx:
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207 locals = ctx.get_all()
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208 else:
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209 locals = {}
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210 for name, value in iteritems(real_locals):
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211 if name.startswith('l_') and value is not missing:
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212 locals[name[2:]] = value
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213
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214 # if there is a local called __jinja_exception__, we get
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215 # rid of it to not break the debug functionality.
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216 locals.pop('__jinja_exception__', None)
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217 else:
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218 locals = {}
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219
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220 # assamble fake globals we need
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221 globals = {
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222 '__name__': filename,
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223 '__file__': filename,
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224 '__jinja_exception__': exc_info[:2],
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225
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226 # we don't want to keep the reference to the template around
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227 # to not cause circular dependencies, but we mark it as Jinja
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228 # frame for the ProcessedTraceback
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229 '__jinja_template__': None
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230 }
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231
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232 # and fake the exception
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233 code = compile('\n' * (lineno - 1) + raise_helper, filename, 'exec')
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234
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235 # if it's possible, change the name of the code. This won't work
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236 # on some python environments such as google appengine
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237 try:
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238 if tb is None:
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239 location = 'template'
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240 else:
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241 function = tb.tb_frame.f_code.co_name
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242 if function == 'root':
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243 location = 'top-level template code'
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244 elif function.startswith('block_'):
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245 location = 'block "%s"' % function[6:]
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246 else:
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247 location = 'template'
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248
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249 if PY2:
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250 code = CodeType(0, code.co_nlocals, code.co_stacksize,
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251 code.co_flags, code.co_code, code.co_consts,
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252 code.co_names, code.co_varnames, filename,
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253 location, code.co_firstlineno,
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254 code.co_lnotab, (), ())
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255 else:
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256 code = CodeType(0, code.co_kwonlyargcount,
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257 code.co_nlocals, code.co_stacksize,
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258 code.co_flags, code.co_code, code.co_consts,
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259 code.co_names, code.co_varnames, filename,
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260 location, code.co_firstlineno,
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261 code.co_lnotab, (), ())
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262 except Exception as e:
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263 pass
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264
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265 # execute the code and catch the new traceback
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266 try:
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267 exec(code, globals, locals)
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268 except:
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269 exc_info = sys.exc_info()
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270 new_tb = exc_info[2].tb_next
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271
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272 # return without this frame
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273 return exc_info[:2] + (new_tb,)
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274
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275
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276 def _init_ugly_crap():
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277 """This function implements a few ugly things so that we can patch the
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278 traceback objects. The function returned allows resetting `tb_next` on
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279 any python traceback object. Do not attempt to use this on non cpython
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280 interpreters
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281 """
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282 import ctypes
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283 from types import TracebackType
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284
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285 if PY2:
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286 # figure out size of _Py_ssize_t for Python 2:
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287 if hasattr(ctypes.pythonapi, 'Py_InitModule4_64'):
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288 _Py_ssize_t = ctypes.c_int64
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289 else:
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290 _Py_ssize_t = ctypes.c_int
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291 else:
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292 # platform ssize_t on Python 3
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293 _Py_ssize_t = ctypes.c_ssize_t
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294
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295 # regular python
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296 class _PyObject(ctypes.Structure):
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297 pass
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298 _PyObject._fields_ = [
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299 ('ob_refcnt', _Py_ssize_t),
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300 ('ob_type', ctypes.POINTER(_PyObject))
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301 ]
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302
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303 # python with trace
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304 if hasattr(sys, 'getobjects'):
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305 class _PyObject(ctypes.Structure):
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306 pass
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307 _PyObject._fields_ = [
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308 ('_ob_next', ctypes.POINTER(_PyObject)),
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309 ('_ob_prev', ctypes.POINTER(_PyObject)),
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310 ('ob_refcnt', _Py_ssize_t),
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311 ('ob_type', ctypes.POINTER(_PyObject))
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312 ]
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313
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314 class _Traceback(_PyObject):
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315 pass
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316 _Traceback._fields_ = [
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317 ('tb_next', ctypes.POINTER(_Traceback)),
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318 ('tb_frame', ctypes.POINTER(_PyObject)),
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319 ('tb_lasti', ctypes.c_int),
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320 ('tb_lineno', ctypes.c_int)
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321 ]
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322
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323 def tb_set_next(tb, next):
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324 """Set the tb_next attribute of a traceback object."""
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325 if not (isinstance(tb, TracebackType) and
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326 (next is None or isinstance(next, TracebackType))):
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327 raise TypeError('tb_set_next arguments must be traceback objects')
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328 obj = _Traceback.from_address(id(tb))
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329 if tb.tb_next is not None:
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330 old = _Traceback.from_address(id(tb.tb_next))
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331 old.ob_refcnt -= 1
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332 if next is None:
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333 obj.tb_next = ctypes.POINTER(_Traceback)()
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334 else:
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335 next = _Traceback.from_address(id(next))
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336 next.ob_refcnt += 1
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337 obj.tb_next = ctypes.pointer(next)
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338
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339 return tb_set_next
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340
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341
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342 # try to get a tb_set_next implementation if we don't have transparent
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343 # proxies.
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344 tb_set_next = None
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345 if tproxy is None:
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346 try:
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347 tb_set_next = _init_ugly_crap()
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348 except:
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349 pass
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350 del _init_ugly_crap