Course of Raku / Regexes and grammars / Grammars / Grammars, classes, and inheritance / Exercises

Inherit a grammar

Problem

Write a base grammar Animal whose TOP matches a sound token (any word). Then write two grammars that inherit from it: Dog, which overrides sound to match woof, and Cat, which overrides it to match meow. Parse 'woof' with Dog, 'meow' with Cat, and — to show each keeps its own sound — 'meow' with Dog as well. Print whether each succeeded.

Example

The program prints:

True
True
False

Solution

✅ See the solution

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