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annotate planemo/lib/python3.7/site-packages/jinja2/debug.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1 import sys
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2 from types import CodeType
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3
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4 from . import TemplateSyntaxError
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5 from ._compat import PYPY
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6 from .utils import internal_code
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7 from .utils import missing
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8
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9
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10 def rewrite_traceback_stack(source=None):
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11 """Rewrite the current exception to replace any tracebacks from
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12 within compiled template code with tracebacks that look like they
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13 came from the template source.
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14
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15 This must be called within an ``except`` block.
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16
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17 :param exc_info: A :meth:`sys.exc_info` tuple. If not provided,
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18 the current ``exc_info`` is used.
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19 :param source: For ``TemplateSyntaxError``, the original source if
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20 known.
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21 :return: A :meth:`sys.exc_info` tuple that can be re-raised.
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22 """
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23 exc_type, exc_value, tb = sys.exc_info()
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24
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25 if isinstance(exc_value, TemplateSyntaxError) and not exc_value.translated:
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26 exc_value.translated = True
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27 exc_value.source = source
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28
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29 try:
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30 # Remove the old traceback on Python 3, otherwise the frames
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31 # from the compiler still show up.
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32 exc_value.with_traceback(None)
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33 except AttributeError:
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34 pass
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35
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36 # Outside of runtime, so the frame isn't executing template
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37 # code, but it still needs to point at the template.
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38 tb = fake_traceback(
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39 exc_value, None, exc_value.filename or "<unknown>", exc_value.lineno
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40 )
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41 else:
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42 # Skip the frame for the render function.
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43 tb = tb.tb_next
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44
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45 stack = []
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46
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47 # Build the stack of traceback object, replacing any in template
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48 # code with the source file and line information.
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49 while tb is not None:
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50 # Skip frames decorated with @internalcode. These are internal
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51 # calls that aren't useful in template debugging output.
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52 if tb.tb_frame.f_code in internal_code:
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53 tb = tb.tb_next
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54 continue
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55
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56 template = tb.tb_frame.f_globals.get("__jinja_template__")
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57
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58 if template is not None:
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59 lineno = template.get_corresponding_lineno(tb.tb_lineno)
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60 fake_tb = fake_traceback(exc_value, tb, template.filename, lineno)
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61 stack.append(fake_tb)
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62 else:
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63 stack.append(tb)
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64
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65 tb = tb.tb_next
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66
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67 tb_next = None
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68
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69 # Assign tb_next in reverse to avoid circular references.
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70 for tb in reversed(stack):
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71 tb_next = tb_set_next(tb, tb_next)
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72
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73 return exc_type, exc_value, tb_next
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74
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75
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76 def fake_traceback(exc_value, tb, filename, lineno):
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77 """Produce a new traceback object that looks like it came from the
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78 template source instead of the compiled code. The filename, line
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79 number, and location name will point to the template, and the local
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80 variables will be the current template context.
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81
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82 :param exc_value: The original exception to be re-raised to create
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83 the new traceback.
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84 :param tb: The original traceback to get the local variables and
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85 code info from.
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86 :param filename: The template filename.
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87 :param lineno: The line number in the template source.
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88 """
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89 if tb is not None:
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90 # Replace the real locals with the context that would be
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91 # available at that point in the template.
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92 locals = get_template_locals(tb.tb_frame.f_locals)
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93 locals.pop("__jinja_exception__", None)
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94 else:
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95 locals = {}
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96
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97 globals = {
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98 "__name__": filename,
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99 "__file__": filename,
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100 "__jinja_exception__": exc_value,
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101 }
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102 # Raise an exception at the correct line number.
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103 code = compile("\n" * (lineno - 1) + "raise __jinja_exception__", filename, "exec")
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104
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105 # Build a new code object that points to the template file and
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106 # replaces the location with a block name.
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107 try:
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108 location = "template"
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109
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110 if tb is not None:
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111 function = tb.tb_frame.f_code.co_name
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112
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113 if function == "root":
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114 location = "top-level template code"
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115 elif function.startswith("block_"):
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116 location = 'block "%s"' % function[6:]
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117
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118 # Collect arguments for the new code object. CodeType only
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119 # accepts positional arguments, and arguments were inserted in
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120 # new Python versions.
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121 code_args = []
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122
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123 for attr in (
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124 "argcount",
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125 "posonlyargcount", # Python 3.8
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126 "kwonlyargcount", # Python 3
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127 "nlocals",
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128 "stacksize",
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129 "flags",
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130 "code", # codestring
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131 "consts", # constants
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132 "names",
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133 "varnames",
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134 ("filename", filename),
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135 ("name", location),
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136 "firstlineno",
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137 "lnotab",
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138 "freevars",
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139 "cellvars",
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140 ):
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141 if isinstance(attr, tuple):
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142 # Replace with given value.
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143 code_args.append(attr[1])
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144 continue
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145
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146 try:
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147 # Copy original value if it exists.
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148 code_args.append(getattr(code, "co_" + attr))
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149 except AttributeError:
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150 # Some arguments were added later.
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151 continue
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152
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153 code = CodeType(*code_args)
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154 except Exception:
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155 # Some environments such as Google App Engine don't support
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156 # modifying code objects.
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157 pass
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158
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159 # Execute the new code, which is guaranteed to raise, and return
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160 # the new traceback without this frame.
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161 try:
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162 exec(code, globals, locals)
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163 except BaseException:
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164 return sys.exc_info()[2].tb_next
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165
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166
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167 def get_template_locals(real_locals):
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168 """Based on the runtime locals, get the context that would be
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169 available at that point in the template.
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170 """
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171 # Start with the current template context.
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172 ctx = real_locals.get("context")
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173
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174 if ctx:
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175 data = ctx.get_all().copy()
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176 else:
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177 data = {}
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178
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179 # Might be in a derived context that only sets local variables
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180 # rather than pushing a context. Local variables follow the scheme
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181 # l_depth_name. Find the highest-depth local that has a value for
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182 # each name.
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183 local_overrides = {}
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184
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185 for name, value in real_locals.items():
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186 if not name.startswith("l_") or value is missing:
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187 # Not a template variable, or no longer relevant.
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188 continue
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189
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190 try:
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191 _, depth, name = name.split("_", 2)
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192 depth = int(depth)
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193 except ValueError:
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194 continue
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195
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196 cur_depth = local_overrides.get(name, (-1,))[0]
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197
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198 if cur_depth < depth:
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199 local_overrides[name] = (depth, value)
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200
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201 # Modify the context with any derived context.
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202 for name, (_, value) in local_overrides.items():
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203 if value is missing:
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204 data.pop(name, None)
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205 else:
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206 data[name] = value
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207
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208 return data
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209
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210
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211 if sys.version_info >= (3, 7):
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212 # tb_next is directly assignable as of Python 3.7
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213 def tb_set_next(tb, tb_next):
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214 tb.tb_next = tb_next
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215 return tb
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216
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217
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218 elif PYPY:
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219 # PyPy might have special support, and won't work with ctypes.
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220 try:
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221 import tputil
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222 except ImportError:
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223 # Without tproxy support, use the original traceback.
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224 def tb_set_next(tb, tb_next):
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225 return tb
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226
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227 else:
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228 # With tproxy support, create a proxy around the traceback that
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229 # returns the new tb_next.
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230 def tb_set_next(tb, tb_next):
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231 def controller(op):
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232 if op.opname == "__getattribute__" and op.args[0] == "tb_next":
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233 return tb_next
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234
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235 return op.delegate()
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236
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237 return tputil.make_proxy(controller, obj=tb)
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238
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239
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240 else:
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241 # Use ctypes to assign tb_next at the C level since it's read-only
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242 # from Python.
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243 import ctypes
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244
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245 class _CTraceback(ctypes.Structure):
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246 _fields_ = [
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247 # Extra PyObject slots when compiled with Py_TRACE_REFS.
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248 ("PyObject_HEAD", ctypes.c_byte * object().__sizeof__()),
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249 # Only care about tb_next as an object, not a traceback.
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250 ("tb_next", ctypes.py_object),
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251 ]
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252
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253 def tb_set_next(tb, tb_next):
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254 c_tb = _CTraceback.from_address(id(tb))
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255
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256 # Clear out the old tb_next.
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257 if tb.tb_next is not None:
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258 c_tb_next = ctypes.py_object(tb.tb_next)
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259 c_tb.tb_next = ctypes.py_object()
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260 ctypes.pythonapi.Py_DecRef(c_tb_next)
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261
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262 # Assign the new tb_next.
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263 if tb_next is not None:
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264 c_tb_next = ctypes.py_object(tb_next)
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265 ctypes.pythonapi.Py_IncRef(c_tb_next)
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266 c_tb.tb_next = c_tb_next
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267
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268 return tb