+++ /dev/null
-#!/usr/bin/env python
-
-
-import re
-import weakref
-
-from util import algorithms
-import operation
-
-
-__BASE_MAPPINGS = {
- "0x": 16,
- "0o": 8,
- "0b": 2,
-}
-
-
-_VARIABLE_VALIDATION_RE = re.compile("^[a-zA-Z0-9]+$")
-
-
-def validate_variable_name(variableName):
- match = _VARIABLE_VALIDATION_RE.match(variableName)
- if match is None:
- raise RuntimeError("Invalid characters in '%s'" % variableName)
-
-
-def parse_number(userInput):
- try:
- base = __BASE_MAPPINGS.get(userInput[0:2], 10)
- if base != 10:
- userInput = userInput[2:] # Remove prefix
- value = int(userInput, base)
- return value, base
- except ValueError:
- pass
-
- try:
- value = float(userInput)
- return value, 10
- except ValueError:
- pass
-
- try:
- value = complex(userInput)
- return value, 10
- except ValueError:
- pass
-
- raise ValueError('Cannot parse "%s" as a number' % userInput)
-
-
-class AbstractHistory(object):
- """
- Is it just me or is this class name begging for some jokes?
- """
-
- def push(self, node):
- raise NotImplementedError
-
- def pop(self):
- raise NotImplementedError
-
- def unpush(self):
- node = self.pop()
- for child in node.get_children():
- self.push(child)
-
- def peek(self):
- raise NotImplementedError
-
- def clear(self):
- raise NotImplementedError
-
- def __len__(self):
- raise NotImplementedError
-
- def __iter__(self):
- raise NotImplementedError
-
-
-class CalcHistory(AbstractHistory):
-
- def __init__(self):
- super(CalcHistory, self).__init__()
- self.__nodeStack = []
-
- def push(self, node):
- assert node is not None
- self.__nodeStack.append(node)
- return node
-
- def pop(self):
- popped = self.__nodeStack[-1]
- del self.__nodeStack[-1]
- return popped
-
- def peek(self):
- return self.__nodeStack[-1]
-
- def clear(self):
- self.__nodeStack = []
-
- def __len__(self):
- return len(self.__nodeStack)
-
- def __iter__(self):
- return self.__nodeStack[::-1]
-
-
-class RpnCalcHistory(object):
-
- def __init__(self, history, entry, errorReporting, constants, operations):
- self.history = history
- self.history._parse_value = self._parse_value
- self.__entry = weakref.ref(entry)
-
- self.__errorReporter = errorReporting
- self.__constants = constants
- self.__operations = operations
-
- self.__serialRenderer = operation.render_number()
-
- @property
- def OPERATIONS(self):
- return self.__operations
-
- @property
- def CONSTANTS(self):
- return self.__constants
-
- def clear(self):
- self.history.clear()
- self.__entry().clear()
-
- def push_entry(self):
- value = self.__entry().get_value()
-
- valueNode = None
- if 0 < len(value):
- valueNode = self._parse_value(value)
- self.history.push(valueNode)
-
- self.__entry().clear()
- return valueNode
-
- def apply_operation(self, Node):
- try:
- self.push_entry()
-
- node = self._apply_operation(Node)
- return node
- except StandardError, e:
- self.__errorReporter.push_exception()
- return None
-
- def serialize_stack(self):
- serialized = (
- stackNode.serialize(self.__serialRenderer)
- for stackNode in self.history
- )
- serialized = list(serialized)
- return serialized
-
- def deserialize_stack(self, data):
- for possibleNode in data:
- for nodeValue in possibleNode:
- if nodeValue in self.OPERATIONS:
- Node = self.OPERATIONS[nodeValue]
- self._apply_operation(Node)
- else:
- node = self._parse_value(nodeValue)
- self.history.push(node)
-
- def _parse_value(self, userInput):
- try:
- value, base = parse_number(userInput)
- return operation.Value(value, base)
- except ValueError:
- pass
-
- try:
- return self.CONSTANTS[userInput]
- except KeyError:
- pass
-
- validate_variable_name(userInput)
- return operation.Variable(userInput)
-
- def _apply_operation(self, Node):
- numArgs = Node.argumentCount
-
- if len(self.history) < numArgs:
- raise ValueError(
- "Not enough arguments. The stack has %d but %s needs %d" % (
- len(self.history), Node.symbol, numArgs
- )
- )
-
- args = [arg for arg in algorithms.func_repeat(numArgs, self.history.pop)]
- args.reverse()
-
- try:
- node = Node(*args)
- except StandardError:
- for arg in args:
- self.history.push(arg)
- raise
- self.history.push(node)
- return node
projects / ejpi / blobdiff