Difference Between Top-down and Bottom-up Parsing Tabular Form
Contents
Top-down and Bottom-up Parsing Difference
- There are two parsing methods
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- Top-down Parsing
- 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.
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 |