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annotate python/simpleini.py @ 707:b46851116cf1

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STUB: k0s/k0s-requirements.txt
author Jeff Hammel <k0scist@gmail.com>
date Wed, 03 Sep 2014 18:19:30 -0700
parents c499f5a598cf
children
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1 #!/usr/bin/env python
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2
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3 import os
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4
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5 def read(fp, variables=None, default='DEFAULT',
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6 comments=';#', separators=('=', ':'),
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7 interpolate=True, strict=True):
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8 """
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9 read an .ini file and return a list of [(section, values)]
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10 - fp : file pointer or name to read
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11 - variables : default set of variables
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12 - default : name of the section for the default section
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13 - comments : characters that if they start a line denote a comment
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14 - separators : strings that denote key, value separation in order
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15 - strict : whether to be strict about parsing
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16 """
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17
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18 if variables is None:
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19 variables = {}
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20
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21 if isinstance(fp, basestring):
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22 fp = file(fp)
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23
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24 sections = []
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25 key = value = None
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26 section_names = set([])
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27
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28 # read the lines
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29 for line in fp.readlines():
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30
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31 stripped = line.strip()
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32
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33 # ignore blank lines
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34 if not stripped:
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35 # XXX should probably reset key and value to avoid continuation lines
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36 key = value = None
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37 continue
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38
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39 # ignore comment lines
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40 if stripped[0] in comments:
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41 continue
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42
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43 # check for a new section
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44 if len(stripped) > 2 and stripped[0] == '[' and stripped[-1] == ']':
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45 section = stripped[1:-1].strip()
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46 key = value = None
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47
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48 # deal with DEFAULT section
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49 if section.lower() == default.lower():
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50 if strict:
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51 assert default not in section_names
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52 section_names.add(default)
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53 current_section = variables
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54 continue
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55
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56 if strict:
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57 # make sure this section doesn't already exist
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58 assert section not in section_names
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59
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60 section_names.add(section)
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61
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62 current_section = {}
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63 sections.append((section, current_section))
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64 continue
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65
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66 # if there aren't any sections yet, something bad happen
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67 if not section_names:
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68 raise Exception('No sections yet :(')
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69
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70 # (key, value) pair
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71 for separator in separators:
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72 if separator in stripped:
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73 key, value = stripped.split(separator, 1)
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74 key = key.strip()
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75 value = value.strip()
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76
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77 if strict:
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78 # make sure this key isn't already in the section or empty
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79 assert key
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80 if current_section is not variables:
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81 assert key not in current_section
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82
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83 current_section[key] = value
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84 break
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85 else:
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86 # continuation line ?
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87 if line[0].isspace() and key:
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88 value = '%s%s%s' % (value, os.linesep, stripped)
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89 current_section[key] = value
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90 else:
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91 # something bad happen!
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92 raise Exception("Not sure what you're trying to do")
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93
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94 # interpret the variables
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95 def interpret_variables(global_dict, local_dict):
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96 variables = global_dict.copy()
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97 variables.update(local_dict)
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98
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99 # string intepolation
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100 if interpolate:
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101 nonce = '__s__'
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102 assert nonce not in global_dict
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103 global_dict[nonce] = '%s'
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104 for key, value in variables.items():
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105 try:
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106 value = value.replace('%s', '%(__s__)s') % global_dict
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107 variables[key] = value
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108 except:
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109 if strict:
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110 del global_dict[nonce]
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111 raise Exception("could not intepolate variable %s: %s" % (key, value))
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112 pass
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113
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114 del global_dict[nonce]
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115 return variables
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116
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117 sections = [(i, interpret_variables(variables, j)) for i, j in sections]
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118 return sections
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119
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120 if __name__ == '__main__':
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121 import sys
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122 for i in sys.argv[1:]:
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123 path = os.path.abspath(i)
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124 print read(i, strict=False, variables=dict(here=os.path.dirname(path)))