author | Nishanth Amuluru <nishanth@fossee.in> |
Sat, 08 Jan 2011 11:20:57 +0530 | |
changeset 307 | c6bca38c1cbf |
permissions | -rw-r--r-- |
307
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1 |
""" brain-dead simple parser for ini-style files. |
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2 |
(C) Ronny Pfannschmidt, Holger Krekel -- MIT licensed |
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""" |
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__version__ = "0.2.dev2" |
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|
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__all__ = ['IniConfig', 'ParseError'] |
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|
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class ParseError(Exception): |
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def __init__(self, path, lineno, msg): |
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Exception.__init__(self, path, lineno, msg) |
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self.path = path |
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self.lineno = lineno |
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self.msg = msg |
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|
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def __str__(self): |
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return "%s:%s: %s" %(self.path, self.lineno+1, self.msg) |
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|
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class SectionWrapper(object): |
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def __init__(self, config, name): |
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self.config = config |
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self.name = name |
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|
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def lineof(self, name): |
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return self.config.lineof(self.name, name) |
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|
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def get(self, key, default=None, convert=str): |
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return self.config.get(self.name, key, convert=convert, default=default) |
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def __getitem__(self, key): |
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return self.config.sections[self.name][key] |
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def __iter__(self): |
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section = self.config.sections.get(self.name, []) |
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def lineof(key): |
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return self.config.lineof(self.name, key) |
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for name in sorted(section, key=lineof): |
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yield name |
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def items(self): |
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for name in self: |
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yield name, self[name] |
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class IniConfig(object): |
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def __init__(self, path, data=None): |
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self.path = str(path) # convenience |
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if data is None: |
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f = open(self.path) |
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try: |
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tokens = self._parse(iter(f)) |
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finally: |
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f.close() |
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else: |
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tokens = self._parse(data.splitlines(True)) |
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self._sources = {} |
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self.sections = {} |
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|
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for lineno, section, name, value in tokens: |
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if section is None: |
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self._raise(lineno, 'no section header defined') |
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self._sources[section, name] = lineno |
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if name is None: |
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if section in self.sections: |
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self._raise(lineno, 'duplicate section %r'%(section, )) |
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self.sections[section] = {} |
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else: |
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if name in self.sections[section]: |
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self._raise(lineno, 'duplicate name %r'%(name, )) |
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self.sections[section][name] = value |
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|
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def _raise(self, lineno, msg): |
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raise ParseError(self.path, lineno, msg) |
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|
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def _parse(self, line_iter): |
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result = [] |
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section = None |
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for lineno, line in enumerate(line_iter): |
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name, data = self._parseline(line, lineno) |
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# new value |
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if name is not None and data is not None: |
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result.append((lineno, section, name, data)) |
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# new section |
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elif name is not None and data is None: |
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if not name: |
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self._raise(lineno, 'empty section name') |
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section = name |
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result.append((lineno, section, None, None)) |
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# continuation |
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elif name is None and data is not None: |
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if not result: |
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self._raise(lineno, 'unexpected value continuation') |
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last = result.pop() |
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last_name, last_data = last[-2:] |
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if last_name is None: |
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self._raise(lineno, 'unexpected value continuation') |
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|
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if last_data: |
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data = '%s\n%s' % (last_data, data) |
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result.append(last[:-1] + (data,)) |
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return result |
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|
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103 |
def _parseline(self, line, lineno): |
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104 |
# comments |
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line = line.split('#')[0].rstrip() |
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# blank lines |
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if not line: |
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108 |
return None, None |
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# section |
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if line[0] == '[' and line[-1] == ']': |
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111 |
return line[1:-1], None |
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# value |
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elif not line[0].isspace(): |
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try: |
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name, value = line.split('=', 1) |
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116 |
if ": " in name: |
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117 |
raise ValueError() |
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118 |
except ValueError: |
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119 |
try: |
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120 |
name, value = line.split(": ", 1) |
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121 |
except ValueError: |
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122 |
self._raise(lineno, 'unexpected line: %r' % line) |
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123 |
return name.strip(), value.strip() |
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124 |
# continuation |
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125 |
else: |
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126 |
return None, line.strip() |
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127 |
|
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128 |
def lineof(self, section, name=None): |
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129 |
lineno = self._sources.get((section, name)) |
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130 |
if lineno is not None: |
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131 |
return lineno + 1 |
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132 |
|
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133 |
def get(self, section, name, default=None, convert=str): |
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134 |
try: |
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135 |
return convert(self.sections[section][name]) |
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136 |
except KeyError: |
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137 |
return default |
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|
138 |
|
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139 |
def __getitem__(self, name): |
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140 |
if name not in self.sections: |
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141 |
raise KeyError(name) |
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142 |
return SectionWrapper(self, name) |
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|
143 |
|
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144 |
def __iter__(self): |
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145 |
for name in sorted(self.sections, key=self.lineof): |
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146 |
yield SectionWrapper(self, name) |
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|
147 |
|
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|
148 |
def __contains__(self, arg): |
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|
149 |
return arg in self.sections |