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annotate makeitso/template.py @ 181:7ac8571788e2

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add script to make templates from files
author Jeff Hammel <k0scist@gmail.com>
date Sun, 23 Mar 2014 11:52:47 -0700
parents cfd4f1e91090
children f10f5beb8ad1
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1 """
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2 basic API template class
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3 """
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4
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5 import os
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6 import sys
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7 from makeitso import ContentTemplate
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8 from makeitso import PolyTemplate
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9
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10 class Undefined(object):
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11 """marker class for variables"""
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12 def __nonzero__(self):
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13 return False
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14 Undefined = Undefined() # singleton
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16
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17 class Variable(object):
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18 """variable object for MakeItSo templates"""
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19
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20 def __init__(self, name, description=None, default=Undefined,
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21 cast=None):
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22 self.name = name
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23 self.default = default
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24 self.description = description
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26 # TODO (maybe): get cast from default variable type if not None
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27 self.cast = cast
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29 self._set = False
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30
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31 def copy(self):
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32 """returns a copy of the variable"""
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33 return Variable(self.name, self.description, self.default, self.cast)
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34
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35 def set(self, value):
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36 if self.cast:
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37 self.value = self.cast(value)
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38 else:
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39 self.value = value
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40 self._set = True
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41 return self.value
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42
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43 def isset(self):
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44 """whether the variable has been set or not"""
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45 return self._set
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47 def read(self, fd=sys.stdout):
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48 """prompt and read the variable from stdin"""
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49 fd.write(self.display())
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50 return self.set(raw_input())
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52 def display(self):
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53 description = self.description or self.name
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54 if self.default:
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55 return 'Enter %s [DEFAULT: %s]: ' % (description, repr(self.default))
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56 else:
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57 return 'Enter %s: ' % description
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59 def __repr__(self):
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60 return "Variable(name='%s')" % self.name
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62 def assemble(*args):
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63 names = set()
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64 retval = []
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65 for arg in args:
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66 if issubclass(arg, MakeItSoTemplate):
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67 arg = arg.vars
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68 for variable in arg:
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69 if variable.name in names:
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70 continue
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71 retval.append(variable.copy())
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72 names.add(variable.name)
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73 return retval
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74
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75 class MakeItSoTemplate(ContentTemplate):
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76 """API template for MakeItSo"""
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77
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78 # name of the template
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79 name = ''
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80
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81 # description of the template
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82 description = ''
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83
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84 # templates to interpolate
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85 # paths are relative to __file__ unless absolute or URIs
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86 templates = []
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87
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88 # variables
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89 vars = []
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90
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91 # inspect the templates for more variables
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92 look = False
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93
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94 def __init__(self, interactive=True, usedefaults=True, variables=None):
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95 """
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96 - output : output file or directory
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97 - interactive : whether tointeractively get variables
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98 - usedefaults : try to use the default values if not specified
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99 """
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100
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101 # boilerplate
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102 variables = variables or {}
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103 if not self.description and hasattr(self, '__doc__'):
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104 self.description = self.__doc__
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105 self.interactive = interactive
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106 _file = sys.modules[self.__class__.__module__].__file__
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107 self.location = os.path.dirname(os.path.abspath(_file))
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108 self.defaults = variables.copy()
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109 self.usedefaults = usedefaults
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110
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111 # make a dictionary of the variables for lookup convenience
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112 self.vardict = {}
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113 for i in self.vars:
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114 self.vardict[i.name] = i
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115
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116 # ensure all of these templates exist
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117 self._templates = []
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118 for template in self.templates:
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119 if not isinstance(template, basestring):
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120 template = os.path.join(*template)
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121 if template.startswith('http://') or template.startswith('https://'):
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122 self._templates.append(template)
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123 continue
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124 if os.path.isabs(template):
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125 path = template
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126 else:
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127 path = os.path.join(self.location, template)
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128 assert os.path.exists(path), "%s does not exist" % path
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129 self._templates.append(path)
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130
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131 @classmethod
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132 def get_description(cls):
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133 if hasattr(cls, 'description'):
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134 if cls.description:
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135 return cls.description
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136 if hasattr(cls, '__doc__'):
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137 return cls.__doc__
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138
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139 def get_variables(self, **variables):
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140 # XXX could do this in the ctor
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141 vars = ContentTemplate.get_variables(self, **variables)
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142 if self.usedefaults:
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143 for variable in self.vars:
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144 if variable.name in vars:
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145 continue
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146 if variable.default is not Undefined:
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147 vars[variable.name] = variable.default
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148 return vars
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149
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150 def missing(self, **variables):
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151
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152 # boilerplate
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153 vars = self.get_variables(**variables)
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154 missing = set([])
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155
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156 # get known needed variables
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157 for var in self.vars:
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158 if var.name not in vars:
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159 if var.default is Undefined:
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160 missing.add(var.name)
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161 continue
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162 if (not self.usedefaults) and (not var.isset()):
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163 missing.add(var.name)
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164
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165 # scan templates for other variables
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166 if self.look:
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167 template = PolyTemplate(self._templates,
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168 interactive=False,
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169 variables=vars)
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170 missing.update(template.missing())
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171
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172 return missing
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173
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174 def pre(self, variables, output):
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175 """do stuff before interpolation"""
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176
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177 def substitute(self, variables, output=None):
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178 """do the substitution"""
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179
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180 # get the variables
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181 vars = self.get_variables(**variables)
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182 self.pre(vars, output)
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183 self.check_missing(vars)
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184
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185 # do the substitution
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186 template = PolyTemplate(self._templates,
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187 interactive=self.interactive,
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188 variables=vars)
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189 template.check_output(output)
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190 template.substitute({}, output)
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191
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192 # do whatever you need to do afterwards
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193 self.post(vars, output)
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194
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195 def post(self, variables, output):
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196 """do stuff after interpolation"""
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197
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198 def read_variables(self, variables):
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199 """read variables from stdin"""
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200 retval = {}
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201 for i in variables:
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202 if i in self.vardict:
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203 value = self.vardict[i].read()
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204 retval[i] = value
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205 else:
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206 retval.update(ContentTemplate.read_variables(self, (i,)))
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207 return retval
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208
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209 class PasteScriptTemplate(MakeItSoTemplate):
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210 """template for backwards compatability with PasteScript"""