Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/jinja2/asyncsupport.py @ 2:6af9afd405e9 draft

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
"planemo upload commit 0a63dd5f4d38a1f6944587f52a8cd79874177fc1"
author shellac
date Thu, 14 May 2020 14:56:58 -0400
parents 26e78fe6e8c4
children
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1 # -*- coding: utf-8 -*-
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2 """The code for async support. Importing this patches Jinja on supported
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3 Python versions.
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4 """
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5 import asyncio
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6 import inspect
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7 from functools import update_wrapper
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8
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9 from markupsafe import Markup
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10
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11 from .environment import TemplateModule
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12 from .runtime import LoopContext
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13 from .utils import concat
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14 from .utils import internalcode
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15 from .utils import missing
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16
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17
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18 async def concat_async(async_gen):
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19 rv = []
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20
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21 async def collect():
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22 async for event in async_gen:
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23 rv.append(event)
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24
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25 await collect()
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26 return concat(rv)
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27
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28
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29 async def generate_async(self, *args, **kwargs):
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30 vars = dict(*args, **kwargs)
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31 try:
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32 async for event in self.root_render_func(self.new_context(vars)):
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33 yield event
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34 except Exception:
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35 yield self.environment.handle_exception()
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36
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37
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38 def wrap_generate_func(original_generate):
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39 def _convert_generator(self, loop, args, kwargs):
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40 async_gen = self.generate_async(*args, **kwargs)
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41 try:
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42 while 1:
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43 yield loop.run_until_complete(async_gen.__anext__())
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44 except StopAsyncIteration:
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45 pass
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46
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47 def generate(self, *args, **kwargs):
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48 if not self.environment.is_async:
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49 return original_generate(self, *args, **kwargs)
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50 return _convert_generator(self, asyncio.get_event_loop(), args, kwargs)
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51
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52 return update_wrapper(generate, original_generate)
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53
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54
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55 async def render_async(self, *args, **kwargs):
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56 if not self.environment.is_async:
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57 raise RuntimeError("The environment was not created with async mode enabled.")
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58
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59 vars = dict(*args, **kwargs)
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60 ctx = self.new_context(vars)
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61
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62 try:
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63 return await concat_async(self.root_render_func(ctx))
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64 except Exception:
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65 return self.environment.handle_exception()
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66
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67
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68 def wrap_render_func(original_render):
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69 def render(self, *args, **kwargs):
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70 if not self.environment.is_async:
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71 return original_render(self, *args, **kwargs)
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72 loop = asyncio.get_event_loop()
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73 return loop.run_until_complete(self.render_async(*args, **kwargs))
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74
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75 return update_wrapper(render, original_render)
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76
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77
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78 def wrap_block_reference_call(original_call):
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79 @internalcode
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80 async def async_call(self):
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81 rv = await concat_async(self._stack[self._depth](self._context))
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82 if self._context.eval_ctx.autoescape:
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83 rv = Markup(rv)
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84 return rv
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85
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86 @internalcode
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87 def __call__(self):
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88 if not self._context.environment.is_async:
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89 return original_call(self)
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90 return async_call(self)
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91
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92 return update_wrapper(__call__, original_call)
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93
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94
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95 def wrap_macro_invoke(original_invoke):
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96 @internalcode
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97 async def async_invoke(self, arguments, autoescape):
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98 rv = await self._func(*arguments)
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99 if autoescape:
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100 rv = Markup(rv)
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101 return rv
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102
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103 @internalcode
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104 def _invoke(self, arguments, autoescape):
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105 if not self._environment.is_async:
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106 return original_invoke(self, arguments, autoescape)
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107 return async_invoke(self, arguments, autoescape)
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108
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109 return update_wrapper(_invoke, original_invoke)
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110
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111
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112 @internalcode
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113 async def get_default_module_async(self):
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114 if self._module is not None:
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115 return self._module
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116 self._module = rv = await self.make_module_async()
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117 return rv
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118
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119
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120 def wrap_default_module(original_default_module):
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121 @internalcode
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122 def _get_default_module(self):
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123 if self.environment.is_async:
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124 raise RuntimeError("Template module attribute is unavailable in async mode")
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125 return original_default_module(self)
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126
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127 return _get_default_module
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128
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129
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130 async def make_module_async(self, vars=None, shared=False, locals=None):
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131 context = self.new_context(vars, shared, locals)
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132 body_stream = []
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133 async for item in self.root_render_func(context):
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134 body_stream.append(item)
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135 return TemplateModule(self, context, body_stream)
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136
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137
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138 def patch_template():
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139 from . import Template
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140
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141 Template.generate = wrap_generate_func(Template.generate)
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142 Template.generate_async = update_wrapper(generate_async, Template.generate_async)
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143 Template.render_async = update_wrapper(render_async, Template.render_async)
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144 Template.render = wrap_render_func(Template.render)
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145 Template._get_default_module = wrap_default_module(Template._get_default_module)
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146 Template._get_default_module_async = get_default_module_async
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147 Template.make_module_async = update_wrapper(
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148 make_module_async, Template.make_module_async
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149 )
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150
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151
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152 def patch_runtime():
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153 from .runtime import BlockReference, Macro
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154
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155 BlockReference.__call__ = wrap_block_reference_call(BlockReference.__call__)
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156 Macro._invoke = wrap_macro_invoke(Macro._invoke)
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157
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158
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159 def patch_filters():
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160 from .filters import FILTERS
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161 from .asyncfilters import ASYNC_FILTERS
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162
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163 FILTERS.update(ASYNC_FILTERS)
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164
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165
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166 def patch_all():
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167 patch_template()
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168 patch_runtime()
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169 patch_filters()
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170
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171
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172 async def auto_await(value):
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173 if inspect.isawaitable(value):
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174 return await value
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175 return value
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176
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177
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178 async def auto_aiter(iterable):
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179 if hasattr(iterable, "__aiter__"):
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180 async for item in iterable:
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181 yield item
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182 return
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183 for item in iterable:
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184 yield item
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185
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186
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187 class AsyncLoopContext(LoopContext):
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188 _to_iterator = staticmethod(auto_aiter)
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189
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190 @property
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191 async def length(self):
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192 if self._length is not None:
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193 return self._length
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194
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195 try:
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196 self._length = len(self._iterable)
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197 except TypeError:
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198 iterable = [x async for x in self._iterator]
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199 self._iterator = self._to_iterator(iterable)
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200 self._length = len(iterable) + self.index + (self._after is not missing)
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201
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202 return self._length
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203
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204 @property
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205 async def revindex0(self):
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206 return await self.length - self.index
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207
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208 @property
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209 async def revindex(self):
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210 return await self.length - self.index0
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211
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212 async def _peek_next(self):
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213 if self._after is not missing:
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214 return self._after
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215
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216 try:
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217 self._after = await self._iterator.__anext__()
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218 except StopAsyncIteration:
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219 self._after = missing
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220
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221 return self._after
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222
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223 @property
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224 async def last(self):
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225 return await self._peek_next() is missing
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226
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227 @property
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228 async def nextitem(self):
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229 rv = await self._peek_next()
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230
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231 if rv is missing:
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232 return self._undefined("there is no next item")
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233
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234 return rv
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235
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236 def __aiter__(self):
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237 return self
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238
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239 async def __anext__(self):
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240 if self._after is not missing:
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241 rv = self._after
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242 self._after = missing
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243 else:
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244 rv = await self._iterator.__anext__()
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245
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246 self.index0 += 1
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247 self._before = self._current
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248 self._current = rv
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249 return rv, self
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250
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251
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252 async def make_async_loop_context(iterable, undefined, recurse=None, depth0=0):
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253 import warnings
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254
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255 warnings.warn(
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256 "This template must be recompiled with at least Jinja 2.11, or"
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257 " it will fail in 3.0.",
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258 DeprecationWarning,
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259 stacklevel=2,
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260 )
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261 return AsyncLoopContext(iterable, undefined, recurse, depth0)
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262
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263
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264 patch_all()