Mercurial > piecrust2

annotate piecrust/templating/inukshukengine.py @ 1185:24413a2963b9

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author Ludovic Chabant <ludovic@chabant.com>
date Thu, 01 Oct 2020 10:58:33 -0700
parents 6370ab74b2d5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1012
576f7ebcd9c0 templating: Add Inukshuk template engine.
Ludovic Chabant <ludovic@chabant.com>
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1 import io
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2 import os.path
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3 import time
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4 import logging
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5 from inukshuk.parser import ParserError
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6 from piecrust.templating.base import (
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7 TemplateEngine, TemplatingError, TemplateNotFoundError)
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8
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9
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10 logger = logging.getLogger(__name__)
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11
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6370ab74b2d5 internal: Don't profile the Inukshuk engine by default, duh.
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12 _profile = False
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13
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14
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15 class InukshukTemplateEngine(TemplateEngine):
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16 ENGINE_NAMES = ['inukshuk', 'inuk']
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17 EXTENSIONS = ['html', 'inuk']
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18
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19 def __init__(self):
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20 self.engine = None
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21 self.pc_cache = {}
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22 self._seg_loader = None
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23 self._buf = io.StringIO()
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24 self._buf.truncate(2048)
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25 if _profile:
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26 self._renderTemplate = self._renderTemplateProf
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27 else:
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28 self._renderTemplate = self._renderTemplateNoProf
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29
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30 def populateCache(self):
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31 self._ensureLoaded()
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32
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33 used_names = set()
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34
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35 def _filter_names(name):
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36 if name in used_names:
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37 return False
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38 used_names.add(name)
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39 return True
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40
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41 self.engine.cacheAllTemplates(cache_condition=_filter_names)
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42
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43 def renderSegment(self, path, segment, data):
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44 if not _string_needs_render(segment.content):
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45 return segment.content, False
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46
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47 self._ensureLoaded()
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48
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49 tpl_name = os.path.relpath(path, self.app.root_dir)
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50 try:
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51 self._seg_loader.templates[tpl_name] = segment.content
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52 tpl = self.engine.getTemplate(tpl_name, memmodule=True)
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53 return self._renderTemplate(tpl, data), True
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54 except ParserError as pe:
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55 raise TemplatingError(pe.message, path, pe.line_num)
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56
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57 def renderFile(self, paths, data):
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58 self._ensureLoaded()
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59
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60 tpl = None
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61 rendered_path = None
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62 for p in paths:
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63 try:
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64 tpl = self.engine.getTemplate(p)
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65 rendered_path = p
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66 break
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67 except Exception:
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68 pass
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69
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70 if tpl is None:
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71 raise TemplateNotFoundError()
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72
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73 try:
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74 return self._renderTemplate(tpl, data)
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75 except ParserError as pe:
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76 raise TemplatingError(pe.message, rendered_path, pe.line_num)
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77
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78 def _renderTemplateNoProf(self, tpl, data):
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79 return tpl.render(data)
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80
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81 def _renderTemplateIntoNoProf(self, tpl, data):
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82 buf = self._buf
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83 buf.seek(0)
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84 tpl.renderInto(data, buf)
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85 buf.flush()
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86 size = buf.tell()
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87 buf.seek(0)
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88 return buf.read(size)
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89
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90 def _renderTemplateProf(self, tpl, data):
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91 stats = self.app.env.stats
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92
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93 # Code copied from Inukshuk, but with an `out_write` method that
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94 # wraps a timer scope.
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95 out = []
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96
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97 def out_write(s):
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98 start = time.perf_counter()
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99 out.append(s)
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100 stats.stepTimerSince('Inukshuk_outWrite', start)
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101
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102 tpl._renderWithContext(None, data, out_write)
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103 return ''.join(out)
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104
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105 def _ensureLoaded(self):
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106 if self.engine is not None:
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107 return
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108
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109 from inukshuk.engine import Engine
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110 from inukshuk.loader import (
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111 StringsLoader, FileSystemLoader, CompositeLoader)
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112 from ._inukshukext import PieCrustExtension
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113
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114 self._seg_loader = StringsLoader()
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115 loader = CompositeLoader([
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116 self._seg_loader,
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117 FileSystemLoader(self.app.templates_dirs)])
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118 self.engine = Engine(loader)
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119 self.engine.autoescape = True
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120 self.engine.extensions.append(PieCrustExtension(self.app))
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121 self.engine.compile_templates = True
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122 self.engine.compile_cache_dir = os.path.join(
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123 self.app.cache_dir, 'inuk')
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124
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125 if _profile:
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126 # If we're profiling, monkeypatch all the appropriate methods
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127 # from the Inukshuk API.
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128 stats = self.app.env.stats
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129
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130 import inukshuk.rendering
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131
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132 afe = inukshuk.rendering._attr_first_access
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133
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134 def wafe(ctx, data, prop_name):
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135 with stats.timerScope('Inukshuk_query'):
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136 return afe(ctx, data, prop_name)
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137
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138 inukshuk.rendering._attr_first_access = wafe
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139
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140 afer = inukshuk.rendering._attr_first_access_root
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141
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142 def wafer(ctx, ctx_locals, data, ctx_globals, prop_name):
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143 with stats.timerScope('Inukshuk_query'):
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144 return afer(ctx, ctx_locals, data, ctx_globals, prop_name)
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145
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146 inukshuk.rendering._attr_first_access_root = wafer
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147
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148 i = inukshuk.rendering.RenderContext.invoke
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149
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150 def wi(ctx, data, out, data_func, *args, **kwargs):
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151 with stats.timerScope('Inukshuk_invoke'):
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152 return i(ctx, data, out, data_func, *args, **kwargs)
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153
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154 inukshuk.rendering.RenderContext.invoke = wi
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155
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156 import inukshuk.template
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157
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158 cc = inukshuk.template.Template._compileContent
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159
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160 def wcc(tpl, force_compiled=False):
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161 with stats.timerScope('Inukshuk_templateCompileContent'):
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162 return cc(tpl, force_compiled)
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163
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164 inukshuk.template.Template._compileContent = wcc
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165
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166 dr = inukshuk.template.Template._doRender
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167
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168 def wdr(tpl, ctx, data, out):
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169 with stats.timerScope('Inukshuk_templateDoRender'):
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170 return dr(tpl, ctx, data, out)
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171
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172 inukshuk.template.Template._doRender = wdr
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173
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174 stats.registerTimer('Inukshuk_query')
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175 stats.registerTimer('Inukshuk_invoke')
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176 stats.registerTimer('Inukshuk_templateDoRender')
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177 stats.registerTimer('Inukshuk_templateCompileContent')
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178 stats.registerTimer('Inukshuk_outWrite')
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179
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180 try:
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181 os.makedirs(self.engine.compile_cache_dir)
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182 except OSError:
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183 pass
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184
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185
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186 def _string_needs_render(txt):
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187 index = txt.find('{')
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188 while index >= 0:
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189 ch = txt[index + 1]
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190 if ch == '{' or ch == '%':
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191 return True
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192 index = txt.find('{', index + 1)
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193 return False