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101 lines
4.2 KiB
101 lines
4.2 KiB
4 years ago
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import re
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# https://stackoverflow.com/questions/249791/regex-for-quoted-string-with-escaping-quotes
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# https://stackoverflow.com/questions/21105360/regex-find-comma-not-inside-quotes
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from collections import namedtuple
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from typing import Dict, List, Optional, Container, Any, Union, Callable
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_param_re = re.compile(
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r'(([a-zA-Z]+)(!=|>=|<=|>|<|==|=)(("(?:[^"\\]|\\.)*"|\'(?:[^\'\\]|\\.)*\'|[^,\s]+)(,("(?:[^"\\]|\\.)*"|\'(?:[^\'\\]|\\.)*\'|[^,\s]+))*))')
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_param_operator_re = re.compile(r'!=|==|=|>|<|>=|<=')
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_param_argument_re = re.compile(r'("(?:[^"\\]|\\.)*"|\'(?:[^\'\\]|\\.)*\'|[^,\s]+)')
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_param_string_re = re.compile(r'("(?:[^"\\]|\\.)*"|\'(?:[^\'\\]|\\.)*\')')
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_param_re_with_post_space = re.compile(
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r'([a-zA-Z]+)(!=|==|=|>|<|>=|<=)(("(?:[^"\\]|\\.)*"|\'(?:[^\'\\]|\\.)*\'|[^,\s]+)(,("(?:[^"\\]|\\.)*"|\'(?:[^\'\\]|\\.)*\'|[^,\s]+))*) ?')
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NamedArgument = namedtuple('NamedArgument', 'name operator value')
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ArgumentValue = namedtuple('ArgumentValue', 'value operator')
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def _parse_named_argument(arg):
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groups = _param_re.fullmatch(arg).groups()
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name = groups[1]
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operator = groups[2]
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values = [value[1:-1] if _param_string_re.fullmatch(value) else value for value in
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_param_argument_re.findall(groups[3])]
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return NamedArgument(name, operator, values)
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def parse_arguments(arg):
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named_arguments_parsed = [_parse_named_argument(na[0]) for na in _param_re.findall(arg)]
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text_argument = _param_re_with_post_space.sub('', arg)
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named_arguments = {}
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for na in named_arguments_parsed:
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if na.name not in named_arguments:
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named_arguments[na.name] = []
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named_arguments[na.name].append(ArgumentValue(na.value, na.operator))
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return ParsedArguments(text_argument.strip(), named_arguments)
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class ArgumentError(Exception):
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pass
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class ParsedArguments:
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text_argument: str
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named_arguments: Dict[str, List[ArgumentValue]]
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def __init__(self, text, named_arguments):
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self.text_argument = text
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self.named_arguments = named_arguments
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self.used = set()
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def single(self, name: str, default: Any = None, allowed_operators: Optional[Container] = None,
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is_list=False, numeric=False, converter: Union[dict, Callable] = lambda n: n):
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if allowed_operators is None:
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allowed_operators = {'>', '<', '>=', '<=', '!=', '==', '='}
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if not isinstance(default, tuple):
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default = ArgumentValue(default, '=')
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self.used.add(name)
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value = self.named_arguments.get(name)
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if value is None:
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return default
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if len(value) != 1:
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raise ArgumentError(f'Expected only one value for parameter "{name}".')
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value = value[0]
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if value.operator not in allowed_operators:
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raise ArgumentError(
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f'Allowed operators for parameter "{name}" are {", ".join(str(o) for o in allowed_operators)}.')
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if numeric:
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try:
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value = ArgumentValue([float(v) for v in value.value], value.operator)
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except ValueError:
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raise ArgumentError(f'Expected numerical arguments for parameter "{name}".')
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try:
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if isinstance(converter, dict):
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value = ArgumentValue([converter[v] for v in value.value], value.operator)
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else:
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value = ArgumentValue([converter(v) for v in value.value], value.operator)
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except Exception:
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raise ArgumentError(f'Invalid value for parameter "{name}".')
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if not is_list:
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if len(value.value) != 1:
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raise ArgumentError(f'List not allowed for parameter "{name}".')
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value = ArgumentValue(value.value[0], value.operator)
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return value
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def has_unused(self):
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return any(name not in self.used for name in self.named_arguments.keys())
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def require_all_arguments_used(self):
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def quote(s):
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return f'"{s}"'
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if self.has_unused():
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raise ArgumentError(
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f'Unkown arguments with names {", ".join(quote(v) for v in self.named_arguments.keys() if v not in self.used)}.')
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if __name__ == '__main__':
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a = (parse_arguments(r'sort=default rating>=13.5 a name="a",b," asf,ds ",\'sdf\',dsf'))
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print(a)
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