Difference Between Top-down and Bottom-up Parsing

Difference Between Top-down and Bottom-up Parsing Tabular Form

Contents

1 Difference Between Top-down and Bottom-up Parsing Tabular Form
- 1.1 Top-down and Bottom-up Parsing Comparison Chart
2 More Difference

Top-down and Bottom-up Parsing Difference

There are two parsing methods

1. Top-down Parsing
2. Bottom-up Parsing

The Key Difference Between Top-down and Bottom-up Parsing is that Top-down parsing starts from the top level and moves downwards Whereas Bottom-up parsing starts from the bottom level and moves upwards.

Comparison between Top-down and Bottom-up Parsing

Top-down and Bottom-up Parsing Comparison Chart

Top-Down Parsing	Bottom-Up Parsing
Parse tree built from root to leaves.	Parse tree built from leaves to root.
Simple to implement	Complex to implement
Top-Down Parsing uses Left Most Derivation.	Bottom-Up Parsing uses Right Most Derivation.
It is less powerful compared to Bottom-up parsing.	It is more powerful compared to Top-down parsing.
Error detection is easy in Top-Down Parsing	Error detection is difficult in Bottom-Up Parsing

More Difference