cucumber-expressions

from cucumber_expressions.expression import Expression from cucumber_expressions.parameter_type import ParameterType, ParameterTypeRegistry # --- Basic Expression Matching --- # Create a registry (required even for built-in types) registry = ParameterTypeRegistry() # Define an expression with a built-in parameter type expression_int = Expression("I have {int} cucumbers in my belly", registry) match_int = expression_int.match("I have 42 cucumbers in my belly") print(f"Match for 'I have 42 cucumbers': {match_int.group_values if match_int else None}") match_float = expression_int.match("I have 3.14 cucumbers in my belly") print(f"Match for 'I have 3.14 cucumbers' (expects int): {match_float.group_values if match_float else None}") # --- Custom Parameter Type --- class Color: def __init__(self, name): self.name = name def __repr__(self): return f"Color('{self.name}')" # Define a custom parameter type and add to the registry color_parameter_type = ParameterType( name="color", regexp="red|blue|yellow", type=Color, transformer=lambda s: Color(s) ) registry.define_parameter_type(color_parameter_type) # Use the custom parameter type in an expression expression_color = Expression("I have a {color} ball", registry) match_color = expression_color.match("I have a red ball") print(f"Match for 'I have a red ball': {match_color.group_values if match_color else None}") match_color_fail = expression_color.match("I have a green ball") print(f"Match for 'I have a green ball': {match_color_fail.group_values if match_color_fail else None}")