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How to Write a Compiler #6 - Testing
For language products typical unit testing doesn't work well long term. Instead I recommend sandboxing for early prototyping and a dedicated test case file runner for more end-to-end style testing.
How to Write a Compiler #5 - The Visitor Pattern
If ever there was a design pattern that's perfectly suited to a job, it's the visitor pattern for working with an abstract syntax tree. But what is the visitor pattern and why is it so well suited?
How to Write a Compiler #4 - The Parser
The Parser takes a stream of tokens, checks the syntax is valid and produces an Abstract Syntax Tree.