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annotate python/simpleini.py @ 114:9b193312ceba

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actually, we *do* want to write into the dict!
author Jeff Hammel <jhammel@mozilla.com>
date Thu, 02 Dec 2010 16:25:26 -0800
parents 44534594f402
children c499f5a598cf
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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=('=', ':'), strict=True):
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7 """
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8 read an .ini file and return a list of [(section, values)]
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9 - fp : file pointer or name to read
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10 - variables : default set of variables
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11 - default : name of the section for the default section
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12 - comments : characters that if they start a line denote a comment
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13 - separators : strings that denote key, value separation in order
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14 - strict : whether to be strict about parsing
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15 """
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16
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17 if variables is None:
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18 variables = {}
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19
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20 if isinstance(fp, basestring):
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21 fp = file(fp)
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22
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23 sections = []
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24 key = value = None
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25 section_names = set([])
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26
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27 # read the lines
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28 for line in fp.readlines():
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29
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30 stripped = line.strip()
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31
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32 # ignore blank lines
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33 if not stripped:
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34 # XXX should probably reset key and value to avoid continuation lines
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35 key = value = None
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36 continue
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37
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38 # ignore comment lines
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39 if stripped[0] in comments:
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40 continue
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41
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42 # check for a new section
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43 if len(stripped) > 2 and stripped[0] == '[' and stripped[-1] == ']':
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44 section = stripped[1:-1].strip()
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45 key = value = None
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46
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47 # deal with DEFAULT section
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48 if section.lower() == default.lower():
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49 if strict:
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50 assert default not in section_names
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51 section_names.add(default)
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52 current_section = variables
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53 continue
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54
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55 if strict:
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56 # make sure this section doesn't already exist
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57 assert section not in section_names
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58
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59 section_names.add(section)
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60
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61 current_section = {}
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62 sections.append((section, current_section))
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63 continue
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64
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65 # if there aren't any sections yet, something bad happen
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66 if not section_names:
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67 raise Exception('No sections yet :(')
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68
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69 # (key, value) pair
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70 for separator in separators:
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71 if separator in stripped:
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72 key, value = stripped.split(separator, 1)
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73 key = key.strip()
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74 value = value.strip()
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75
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76 if strict:
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77 # make sure this key isn't already in the section or empty
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78 assert key
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79 if current_section is not variables:
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80 assert key not in current_section
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81
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82 current_section[key] = value
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83 break
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84 else:
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85 # continuation line ?
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86 if line[0].isspace() and key:
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87 value = '%s%s%s' % (value, os.linesep, stripped)
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88 current_section[key] = value
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89 else:
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90 # something bad happen!
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91 raise Exception("Not sure what you're trying to do")
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92
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93 # interpret the variables
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94 def interpret_variables(global_dict, local_dict):
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95 variables = global_dict.copy()
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96 variables.update(local_dict)
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97 # TODO: string intepolation
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98 return variables
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99
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100 sections = [(i, interpret_variables(variables, j)) for i, j in sections]
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101 return sections
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102
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103 if __name__ == '__main__':
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104 import sys
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105 for i in sys.argv[1:]:
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106 print read(i)