166 lines
5.1 KiB
Python
166 lines
5.1 KiB
Python
""" brain-dead simple parser for ini-style files.
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(C) Ronny Pfannschmidt, Holger Krekel -- MIT licensed
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"""
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__all__ = ['IniConfig', 'ParseError']
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COMMENTCHARS = "#;"
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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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def __str__(self):
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return "%s:%s: %s" % (self.path, self.lineno+1, self.msg)
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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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def lineof(self, name):
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return self.config.lineof(self.name, name)
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def get(self, key, default=None, convert=str):
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return self.config.get(self.name, key,
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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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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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def _raise(self, lineno, msg):
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raise ParseError(self.path, lineno, msg)
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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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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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def _parseline(self, line, lineno):
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# blank lines
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if iscommentline(line):
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line = ""
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else:
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line = line.rstrip()
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if not line:
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return None, None
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# section
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if line[0] == '[':
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realline = line
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for c in COMMENTCHARS:
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line = line.split(c)[0].rstrip()
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if line[-1] == "]":
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return line[1:-1], None
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return None, realline.strip()
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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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if ":" in name:
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raise ValueError()
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except ValueError:
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try:
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name, value = line.split(":", 1)
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except ValueError:
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self._raise(lineno, 'unexpected line: %r' % line)
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return name.strip(), value.strip()
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# continuation
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else:
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return None, line.strip()
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def lineof(self, section, name=None):
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lineno = self._sources.get((section, name))
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if lineno is not None:
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return lineno + 1
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def get(self, section, name, default=None, convert=str):
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try:
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return convert(self.sections[section][name])
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except KeyError:
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return default
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def __getitem__(self, name):
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if name not in self.sections:
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raise KeyError(name)
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return SectionWrapper(self, name)
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def __iter__(self):
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for name in sorted(self.sections, key=self.lineof):
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yield SectionWrapper(self, name)
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def __contains__(self, arg):
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return arg in self.sections
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def iscommentline(line):
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c = line.lstrip()[:1]
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return c in COMMENTCHARS
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