Mercurial > hg > MakeItSo

annotate makeitso/template.py @ 82:c434b83ab600

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add a template to create templates. tricky, eh?
author Jeff Hammel <jhammel@mozilla.com>
date Sun, 09 Jan 2011 10:43:47 -0800
parents d4184945f8a8
children 712a6d358083
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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 class Variable(object):
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17 """variable object for MakeItSo templates"""
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19 def __init__(self, name, description=None, default=Undefined,
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20 cast=None):
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21 self.name = name
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22 self.default = default
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23 self.description = description
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25 # TODO (maybe): get cast from default variable type if not None
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26 self.cast = cast
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28 self._set = False
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29
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30 def copy(self):
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31 """returns a copy of the variable"""
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32 return Variable(self.name, self.description, self.default, self.cast)
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34 def set(self, value):
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35 if self.cast:
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36 self.value = self.cast(value)
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37 else:
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38 self.value = value
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39 self._set = True
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41 def read(self, fd=sys.stdout):
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42 """prompt and read the variable from stdin"""
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43 fd.write(self.display())
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44 self.set(raw_input())
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46 def display(self):
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47 description = self.description or self.name
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48 if self.default:
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49 return 'Enter %s [DEFAULT: %s]:' % (description, repr(self.default))
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50 else:
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51 return 'Enter %s:' % description
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52
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53 def __repr__(self):
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54 return "Variable(name='%s')" % self.name
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55
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56 def assemble(*args):
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57 names = set()
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58 retval = []
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59 for arg in args:
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60 if issubclass(arg, MakeItSoTemplate):
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61 arg = arg.vars
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62 for variable in arg:
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63 if variable.name in names:
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64 continue
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65 retval.append(variable.copy())
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66 names.add(variable.name)
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67 return retval
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68
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69 class MakeItSoTemplate(ContentTemplate):
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70 """API template for MakeItSo"""
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71
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72 # name of the template
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73 name = ''
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74
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75 # description of the template
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76 description = ''
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77
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78 # templates to interpolate
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79 # paths are relative to __file__ unless absolute or URIs
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80 templates = []
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81
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82 # variables
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83 vars = []
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84
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85 # inspect the templates for more variables
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86 look = False
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87
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88 def __init__(self, output=None, interactive=True, usedefaults=True,
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89 variables=None):
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90 """
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91 - output : output file or directory
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92 - interactive : whether tointeractively get variables
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93 - usedefaults : try to use the default values if not specified
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94 """
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95
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96 # boilerplate
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97 variables = variables or {}
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98 self.output = output
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99 if not self.description and hasattr(self, '__doc__'):
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100 self.description = self.__doc__
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101 self.interactive = interactive
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102 _file = sys.modules[self.__class__.__module__].__file__
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103 self.location = os.path.dirname(os.path.abspath(_file))
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104 self.defaults = variables.copy()
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105 self.usedefaults = usedefaults
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106
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107 # make a dictionary of the variables for lookup convenience
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108 self.vardict = {}
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109 for i in self.vars:
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110 self.vardict[i.name] = i
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111
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112 # ensure all of these templates exist
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113 self._templates = []
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114 for template in self.templates:
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115 if template.startswith('http://') or template.startswith('https://'):
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116 self._templates.append(template)
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117 continue
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118 if os.path.isabs(template):
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119 path = template
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120 else:
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121 path = os.path.join(self.location, template)
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122 assert os.path.exists(path), "%s does not exist" % path
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123 self._templates.append(path)
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124
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125 def get_variables(self, **variables):
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126 # XXX could do this in the ctor
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127 vars = ContentTemplate.get_variables(self, **variables)
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128 if self.usedefaults:
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129 for variable in self.vars:
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130 if variable.name in vars:
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131 continue
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132 if variable.default is not Undefined:
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133 vars[variable.name] = variable.default
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134 return vars
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135
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136 def missing(self, **variables):
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137 vars = self.get_variables(**variables)
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138 missing = set([])
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139
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140 # get known needed variables
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141 for var in self.vars:
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142 if var.name not in vars:
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143 missing.add(var)
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144
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145 if self.look:
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146 # scan templates for other variables
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147 raise NotImplementedError
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148
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149 return missing
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150
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151 def pre(self, variables):
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152 """do stuff before interpolation"""
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153
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154 def substitute(self, **variables):
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155 """do the substitution"""
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156
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157 vars = self.get_variables(**variables)
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158 self.pre(vars)
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159 self.check_missing(vars)
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160
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161 # do the substitution
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162 template = PolyTemplate(self._templates,
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163 output=self.output,
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164 interactive=self.interactive,
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165 variables=vars)
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166 template.substitute()
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167
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168 self.post(vars)
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169
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170 def post(self, variables):
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171 """do stuff after interpolation"""
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172
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173 def read_variables(self, variables):
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174 """read variables from stdin"""
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175 retval = {}
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176 for i in variables:
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177 if i in self.vardict:
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178 self.vardict[i].read()
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179 else:
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180 retval.update(ContentTemplate.read_variables(self, (i,)))
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181 return retval
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182
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183 class PasteScriptTemplate(MakeItSoTemplate):
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184 """template for backwards compatability with PasteScript"""