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author | Alec Warner <antarus@gentoo.org> | 2007-07-23 05:23:18 +0000 |
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committer | Alec Warner <antarus@gentoo.org> | 2007-07-23 05:23:18 +0000 |
commit | 29b10eda9289ce8057de38186fb3b8a141eeeb1b (patch) | |
tree | 9f5abf26fe33b0a1c5282e42c3e0468d501cffe5 | |
parent | 54f7dcc57b420d21af0268ba10a61b724cf3ed29 (diff) | |
download | portage-29b10eda9289ce8057de38186fb3b8a141eeeb1b.tar.gz portage-29b10eda9289ce8057de38186fb3b8a141eeeb1b.tar.bz2 portage-29b10eda9289ce8057de38186fb3b8a141eeeb1b.zip |
Move common file functionality into a FileLoader class and delegate parsing to subclasses via a lineParser func, no idea how this will work performance wise. Fix errors in parser (blank lines are not errors ;))
svn path=/main/trunk/; revision=7365
-rw-r--r-- | pym/portage/env/config.py | 3 | ||||
-rw-r--r-- | pym/portage/env/loaders.py | 249 |
2 files changed, 140 insertions, 112 deletions
diff --git a/pym/portage/env/config.py b/pym/portage/env/config.py index a354dcf7d..bb63e35e8 100644 --- a/pym/portage/env/config.py +++ b/pym/portage/env/config.py @@ -6,7 +6,7 @@ from UserDict import UserDict from portage.env.loaders import KeyListFileLoader, KeyValuePairFileLoader, ItemFileLoader -class UserConfigKlass(UserDict,object): +class UserConfigKlass(UserDict, object): """ A base class stub for things to inherit from. Users may want a non-file backend. @@ -19,6 +19,7 @@ class UserConfigKlass(UserDict,object): @param loader: A class that has a load() that returns two dicts the first being a data dict, the second being a dict of errors. """ + UserDict.__init__(self) self._loader = loader def load(self): diff --git a/pym/portage/env/loaders.py b/pym/portage/env/loaders.py index 03d3f2264..e80bce6de 100644 --- a/pym/portage/env/loaders.py +++ b/pym/portage/env/loaders.py @@ -15,11 +15,13 @@ class LoaderError(Exception): @type error_msg: String """ - self.resource + self.resource = resource + self.error_msg = error_msg def __str__(self): return "Failed while loading resource: %s, error was: %s" % ( - resource, error_msg) + self.resource, self.error_msg) + def RecursiveFileLoader(filename): """ @@ -36,16 +38,17 @@ def RecursiveFileLoader(filename): """ if os.path.isdir(filename): - for root, dirs, files in os.walk(self.fname): + for root, dirs, files in os.walk(filename): if 'CVS' in dirs: dirs.remove('CVS') - files = filter(files, startswith('.')) - files = filter(files, endswith('~')) - for file in files: - yield file + files = filter(files, str.startswith('.')) + files = filter(files, str.endswith('~')) + for f in files: + yield f else: yield filename + class DataLoader(object): def __init__(self, validator): @@ -63,9 +66,58 @@ class DataLoader(object): """ Function to do the actual work of a Loader """ - pass + raise NotImplementedError("Please override in a subclass") + + +class FileLoader(DataLoader): + """ Class to access data in files """ + + def __init__(self, filename, validator): + """ + Args: + filename : Name of file or directory to open + validator : class with validate() method to validate data. + """ + DataLoader.__init__(self, validator) + self.fname = filename + + def load(self): + """ + Return the {source: {key: value}} pairs from a file + Return the {source: [list of errors] from a load + + @param recursive: If set and self.fname is a directory; + load all files in self.fname + @type: Boolean + @rtype: tuple + @returns: + Returns (data,errors), both may be empty dicts or populated. + """ + data = {} + errors = {} + # I tried to save a nasty lookup on lineparser by doing the lookup + # once, which may be expensive due to digging in child classes. + func = self.lineParser + for fn in RecursiveFileLoader(self.fname): + f = open(fn, 'rb') + for line_num, line in enumerate(f): + func(line, line_num, data, errors) + return (data, errors) + + def lineParser(self, line, line_num, data, errors): + """ This function parses 1 line at a time + Args: + line: a string representing 1 line of a file + line_num: an integer representing what line we are processing + data: a dict that contains the data we have extracted from the file + already + errors: a dict representing parse errors. + Returns: + Nothing (None). Writes to data and errors + """ + raise NotImplementedError("Please over-ride this in a child class") -class ItemFileLoader(DataLoader): +class ItemFileLoader(FileLoader): """ Class to load data from a file full of items one per line @@ -78,36 +130,31 @@ class ItemFileLoader(DataLoader): Note that due to the data store being a dict, duplicates are removed. """ - - _recursive = False def __init__(self, filename, validator): - DataLoader.__init__(self, validator) - self.fname = filename + FileLoader.__init__(self, filename, validator) - def load(self): - data = {} - errors = {} - for file in RecursiveFileLoader(self.fname): - f = open(file, 'rb') - for line_num, line in enumerate(f): - if line.startswith('#'): - continue - split = line.strip().split() - if not len(split): - errors.setdefault(self.fname,[]).append( - "Malformed data at line: %s, data: %s" - % (line_num + 1, split)) - key = split[0] - if not self._validator.validate(key): - errors.setdefault(self.fname,[]).append( - "Validation failed at line: %s, data %s" - % (line_num + 1, split)) - continue - data[key] = None - return (data, errors) - -class KeyListFileLoader(DataLoader): + def lineParser(self, line, line_num, data, errors): + line = line.strip() + if line.startswith('#'): # Skip commented lines + return + if not len(line): # skip empty lines + return + split = line.split() + if not len(split): + errors.setdefault(self.fname, []).append( + "Malformed data at line: %s, data: %s" + % (line_num + 1, line)) + return + key = split[0] + if not self._validator.validate(key): + errors.setdefault(self.fname, []).append( + "Validation failed at line: %s, data %s" + % (line_num + 1, key)) + return + data[key] = None + +class KeyListFileLoader(FileLoader): """ Class to load data from a file full of key [list] tuples @@ -116,40 +163,36 @@ class KeyListFileLoader(DataLoader): {'key':['foo1','foo2','foo3']} """ - _recursive = False - def __init__(self, filename, validator): - DataLoader.__init__(self, validator) - self.fname = filename - - def load(self): - data = {} - errors = {} - for file in RecursiveFileLoader(self.fname): - f = open(file, 'rb') - for line_num, line in enumerate(f): - if line.startswith('#'): - continue - split = line.strip().split() - if len(split) < 2: - errors.setdefault(self.fname,[]).append( - "Malformed data at line: %s, data: %s" - % (line_num + 1, split)) - continue - key = split[0] - value = split[1:] - if not self._validator.validate(key): - errors.setdefault(self.fname,[]).append( - "Validation failed at line: %s, data %s" - % (line_num + 1, split)) - continue - if key in data: - data[key].append(value) - else: - data[key] = value - return (data, errors) - -class KeyValuePairFileLoader(DataLoader): + FileLoader.__init__(self, filename, validator) + + + def lineParser(self, line, line_num, data, errors): + line = line.strip() + if line.startswith('#'): # Skip commented lines + return + if not len(line): # skip empty lines + return + split = line.split() + if len(split) < 2: + errors.setdefault(self.fname, []).append( + "Malformed data at line: %s, data: %s" + % (line_num + 1, line)) + return + key = split[0] + value = split[1:] + if not self._validator.validate(key): + errors.setdefault(self.fname, []).append( + "Validation failed at line: %s, data %s" + % (line_num + 1, key)) + return + if key in data: + data[key].append(value) + else: + data[key] = value + + +class KeyValuePairFileLoader(FileLoader): """ Class to load data from a file full of key=value pairs @@ -160,47 +203,31 @@ class KeyValuePairFileLoader(DataLoader): 'foo':'bar'} """ - _recursive = False - def __init__(self, filename, validator): - DataLoader.__init__(self, validator) - self.fname = filename + FileLoader.__init__(self, filename, validator) + + + def lineParser(self, line, line_num, data, errors): + line = line.strip() + if line.startswith('#'): # skip commented lines + return + if not len(line): # skip empty lines + return + split = line.split('=') + if len(split) < 2: + errors.setdefault(self.fname, []).append( + "Malformed data at line: %s, data %s" + % (line_num + 1, line)) + return + key = split[0] + value = split[1:] + if not self._validator.validate(key): + errors.setdefault(self.fname, []).append( + "Validation failed at line: %s, data %s" + % (line_num + 1, key)) + return + if key in data: + data[key].append(value) + else: + data[key] = value - def load(self): - """ - Return the {source: {key: value}} pairs from a file - Return the {source: [list of errors] from a load - - @param recursive: If set and self.fname is a directory; - load all files in self.fname - @type: Boolean - @rtype: tuple - @returns: - Returns (data,errors), both may be empty dicts or populated. - """ - - DataLoader.load(self) - data = {} - errors = {} - for file in RecursiveFileLoader(self.fname): - f = open(file, 'rb') - for line_num, line in enumerate(f): - if line.startswith('#'): - continue - split = line.strip().split('=') - if len(split) < 2: - errors.setdefault(self.fname, []).append( - "Malformed data at line: %s, data %s" - % (line_num + 1, split)) - key = split[0] - value = split[1:] - if not self._validator.validate(key): - errors.setdefault(self.fname, []).append( - "Validation failed at line: %s, data %s" - % (line_num + 1, split)) - continue - if key in data: - data[key].append(value) - else: - data[key] = value - return (data, errors) |