Recursive descent parser: how to find the FIRST, FOLLOW, and PREDICT sets?

StackOverflow https://stackoverflow.com/questions/564084

  •  05-09-2019
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Question

I'm looking for a good explanation of the definitions of the FIRST, FOLLOW, and PREDICT sets of a RDP when given a grammar.

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Solution

Try Programming Language Pragmatics, by Michael L. Scott (Morgan Kaufmann). Parsing is covered in chapter 2. Recursive-descent parsing is described in section 2.2.3; first and follow sets in 2.2.5.

OTHER TIPS

You can automatically calculate first, follow, and predict sets using Calculate Predict, First, and Follow Sets from BNF (Backus Naur Form) Grammar Specification without having to download anything. It's a good way to verify answers or automate the tedium.

If you want to do it manually, the Dragon Book (2nd ed) covers it on pages 221-222.

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