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diff --git a/trunk/src/examples/shapes.py b/trunk/src/examples/shapes.py
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-# shapes.py
-#
-# A sample program showing how parse actions can convert parsed
-# strings into a data type or object.
-#
-# Copyright 2012, Paul T. McGuire
-#
-
-# define class hierarchy of Shape classes, with polymorphic area method
-class Shape(object):
- def __init__(self, tokens):
- self.__dict__.update(tokens.asDict())
-
- def area(self):
- raise NotImplementedException()
-
- def __str__(self):
- return "<%s>: %s" % (self.__class__.__name__, self.__dict__)
-
-class Square(Shape):
- def area(self):
- return self.side**2
-
-class Rectangle(Shape):
- def area(self):
- return self.width * self.height
-
-class Circle(Shape):
- def area(self):
- return 3.14159 * self.radius**2
-
-
-from pyparsing import *
-
-number = Regex(r'-?\d+(\.\d*)?').setParseAction(lambda t:float(t[0]))
-
-# Shape expressions:
-# square : S <centerx> <centery> <side>
-# rectangle: R <centerx> <centery> <width> <height>
-# circle : C <centerx> <centery> <diameter>
-
-squareDefn = "S" + number('centerx') + number('centery') + number('side')
-rectDefn = "R" + number('centerx') + number('centery') + number('width') + number('height')
-circleDefn = "C" + number('centerx') + number('centery') + number('diameter')
-
-squareDefn.setParseAction(Square)
-rectDefn.setParseAction(Rectangle)
-
-def computeRadius(tokens):
- tokens['radius'] = tokens.diameter/2.0
-circleDefn.setParseAction(computeRadius, Circle)
-
-shapeExpr = squareDefn | rectDefn | circleDefn
-
-tests = """\
-C 0 0 100
-R 10 10 20 50
-S -1 5 10""".splitlines()
-
-for t in tests:
- shape = shapeExpr.parseString(t)[0]
- print(shape)
- print("Area:", shape.area())
- print()