Functions to parse and access the arguments givento the program on the command line,parsearguments,'''Handle co
Functions to parse and access the arguments givento the program on the command line,parsearguments,'''Handle co
'''Handle command line arguments.This module contains functions to parse and access the arguments givento the program on the command line.'''import typesimport stringimport sys# Symbolic constants for the indexes into an argument specifier tuple.NAME = 0MANDATORY = 1TYPE = 2HELP = 3DEFAULT = 4SPEC_LENGTH = 5Bool = []helpSpec = ( ('help', 0, Bool, 'print help and exit'),)def parseArgs(title, argv, argSpecs, filesOK): '''Parse and check command line arguments. Scan the command line arguments in *argv* according to the argument specifier *argSpecs*. Return **None** if there are no errors in the arguments, otherwise return an error string describing the error. This function must be called to initialise this module. title -- The name of the program. This is used when returning error messages or help text. argv -- A sequence containing the arguments given to the program. Normally **sys.argv**. argSpecs -- A sequence of argument specifiers. Each specifier describes a valid command line argument and consists of 4 or 5 items: - The argument name (without a leading minus sign **-**). - A boolean value, true if the argument is mandatory. - This should be **Args.Bool** if the argument has no option. Otherwise it should be a string describing the option required for this argument. This is used when printing help. - A short string describing the argument. - The default value of the argument. This should only be used for non-mandatory arguments expecting an option. For example: ( ('foreground', 0, 'colour', 'colour of text', 'black'), ('geometry', 0, 'spec', 'geometry of initial window'), ('server', 1, 'ompserver', 'ompserver to connect to'), ('silent', 0, Args.Bool, 'do not sound bell'), ) ''' global programName global _fileList errMsg = title + ' command line error: ' programName = argv[0]; argSpecs = helpSpec + argSpecs argSpecDic = {} for spec in argSpecs: arg = spec[NAME] argSpecDic[arg] = spec if len(spec) >= SPEC_LENGTH: set(arg, spec[DEFAULT]) elif spec[TYPE] is Bool: set(arg, 0) else: set(arg, None) knownKeys = argSpecDic.keys() i = 1 _fileList = [] argc = len(argv) while i < argc: arg = argv[i] key = arg[1:] if key in knownKeys: spec = argSpecDic[key] if spec[TYPE] is Bool: set(key, 1) else: i = i + 1 if i >= argc: return errMsg + 'missing argument to \'' + arg + '\' option.' value = argv[i] if len(spec) >= SPEC_LENGTH: try: if type(spec[DEFAULT]) == types.IntType: typeStr = 'integer' value = string.atoi(value) elif type(spec[DEFAULT]) == types.FloatType: typeStr = 'float' value = string.atof(value) except: sys.exc_traceback = None # Clean up object references return errMsg + 'cannot convert string \'' + value + \ '\' to ' + typeStr + ' for option \'-' + key + '\'.' set(key, value) else: _fileList.append(arg) i = i + 1 if get('help'): return _helpString(title, argSpecs) if not filesOK and len(_fileList) > 0: if len(_fileList) == 1: return errMsg + 'unknown option \'' + str(_fileList[0]) + '\'.' else: return errMsg + 'unknown options ' + str(_fileList) + '.' _missing = [] for spec in argSpecs: if spec[MANDATORY] and get(spec[NAME]) is None: _missing.append(spec[NAME]) if len(_missing) == 1: return errMsg + 'required argument \'-' + \ str(_missing[0]) + '\' is missing.' elif len(_missing) > 1: return errMsg + 'required arguments ' + \ str(map(lambda s: '-' + s, _missing)) + ' are missing.' return Nonedef fileList(): return _fileListdef _helpString(title, argSpecs): max = 0 for spec in argSpecs: if spec[TYPE] is Bool: width = len(spec[NAME]) + 1 else: width = len(spec[NAME]) + 4 + len(spec[TYPE]) if width > max: max = width rtn = title + ' command line arguments:' format = '\n %-' + str(max) + 's %s' for mandatory in (1, 0): needHeader = 1 for spec in argSpecs: if mandatory and spec[MANDATORY] or not mandatory and not spec[MANDATORY]: if needHeader: if mandatory: rtn = rtn + '\n Mandatory arguments:' else: rtn = rtn + '\n Optional arguments (defaults in parentheses):' needHeader = 0 if spec[TYPE] is Bool: arg = '-%s' % spec[NAME] else: arg = '-%s <%s>' % (spec[NAME], spec[TYPE]) if len(spec) >= SPEC_LENGTH: if type(spec[DEFAULT]) == types.StringType: definition = spec[HELP] + ' (' + spec[DEFAULT] + ')' else: definition = spec[HELP] + ' (' + str(spec[DEFAULT]) + ')' else: definition = spec[HELP] rtn = rtn + format % (arg, definition) return rtndef exists(key): return configDict.has_key(key)def get(key): return configDict[key]def set(key, value): global configDict configDict[key] = valueconfigDict = {}
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