Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/jinja2/asyncsupport.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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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() |