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annotate makeitso/template.py @ 67:a0f7bfa98755

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API templates now hobble along on their own two feet
author Jeff Hammel <jhammel@mozilla.com>
date Fri, 07 Jan 2011 10:58:28 -0800
parents 7821c82772f5
children a75138a952d0
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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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15
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16 class Variable(object):
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17 """variable object for MakeItSo templates"""
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18
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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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30 def set(self, value):
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31 if self.cast:
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32 self.value = self.cast(value)
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33 else:
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34 self.value = value
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35 self._set = True
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37 def read(self, fd=sys.stdout):
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38 """prompt and read the variable from stdin"""
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39 fd.write(self.display())
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40 self.set(raw_input())
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42 def display(self):
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43 description = self.description or self.name
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44 if self.default:
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45 return 'Enter %s [DEFAULT: %s]:' % (description, repr(self.default))
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46 else:
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47 return 'Enter %s:' % description
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48
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49 class MakeItSoTemplate(ContentTemplate):
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50 """API template for MakeItSo"""
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51
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52 # name of the template
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53 name = ''
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54
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55 # description of the template
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56 description = ''
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57
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58 # templates to interpolate
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59 # paths are relative to __file__ unless absolute or URIs
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60 templates = []
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61
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62 # variables
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63 vars = []
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64
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65 # inspect the templates for more variables
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66 look = False
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67
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68 def __init__(self, output=None, interactive=True, usedefaults=True,
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69 variables=None):
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70 """
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71 - output : output file or directory
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72 - interactive : whether tointeractively get variables
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73 - usedefaults : try to use the default values if not specified
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74 """
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75
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76 # boilerplate
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77 assert self.templates
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78 variables = variables or {}
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79 self.output = output
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80 self.interactive = interactive
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81 _file = sys.modules[self.__class__.__module__].__file__
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82 self.location = os.path.dirname(os.path.abspath(_file))
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83 self.defaults = variables.copy()
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84 self.usedefaults = usedefaults
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85
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86 # make a dictionary of the variables for lookup convenience
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87 self.vardict = {}
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88 for i in self.vars:
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89 self.vardict[i.name] = i
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90
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91 # ensure all of these templates exist
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92 self._templates = []
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93 for template in self.templates:
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94 if template.startswith('http://') or template.startswith('https://'):
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95 self._templates.append(template)
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96 continue
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97 if os.path.isabs(template):
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98 path = template
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99 else:
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100 path = os.path.join(self.location, template)
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101 assert os.path.exists(path), "%s does not exist" % path
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102 self._templates.append(path)
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103
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104 def get_variables(self, **variables):
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105 # XXX could do this in the ctor
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106 vars = ContentTemplate.get_variables(self, **variables)
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107 if self.usedefaults:
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108 for variable in self.vars:
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109 if variable.name in vars:
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110 continue
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111 if variable.default is not Undefined:
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112 vars[variable.name] = variable.default
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113 return vars
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114
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115 def missing(self, **variables):
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116 vars = self.get_variables(**variables)
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117 missing = set([])
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118
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119 # get known needed variables
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120 for var in self.vars:
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121 if var.name not in vars:
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122 missing.add(var)
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123
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124 if self.look:
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125 # scan templates for other variables
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126 raise NotImplementedError
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127
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128 return missing
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129
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130 def pre(self, **variables):
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131 """do stuff before interpolation"""
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132
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133 def substitute(self, **variables):
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134 """do the substitution"""
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135
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136 vars = self.get_variables(**variables)
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137 self.pre(**vars)
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138 self.check_missing(vars)
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139
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140 # do the substitution
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141 template = PolyTemplate(self._templates,
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142 output=self.output,
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143 interactive=self.interactive,
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144 variables=vars)
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145 template.substitute()
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146
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147 self.post(**variables)
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148
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149 def post(self, **variables):
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150 """do stuff after interpolation"""
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151
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152 def read_variables(self, variables):
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153 """read variables from stdin"""
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154 retval = {}
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155 for i in variables:
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156 if i in self.vardict:
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157 self.vardict[i].read()
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158 else:
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159 retval.update(ContentTemplate.read_variables(self, (i,)))
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160 return retval
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161
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162 class PasteScriptTemplate(MakeItSoTemplate):
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163 """template for backwards compatability with PasteScript"""