Parsing in Compiler Design

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What is parsing in Compiler Design?

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Parsing is a process where a parser checks whether the input string follows the grammar rules and builds a parse tree.

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What is Top-Down Parsing?

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Top-Down Parsing starts from the start symbol and tries to derive the input string, building the parse tree from root to leaves.

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What is an example of Top-Down Parsing?

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Recursive Descent Parser.

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What is Bottom-Up Parsing?

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Bottom-Up Parsing starts from the input string and reduces it to the start symbol, building the parse tree from leaves to root.

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What is an example of Bottom-Up Parsing?

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Shift-Reduce Parser.

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What is the working approach of Top-Down Parsing?

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Top-Down Parsing uses Leftmost Derivation and expands non-terminals step by step.

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What is the working approach of Bottom-Up Parsing?

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Bottom-Up Parsing uses Rightmost Derivation in reverse and reduces strings step by step.

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How does Top-Down Parsing construct a parse tree?

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It starts from the root (Start Symbol) and moves downward.

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How does Bottom-Up Parsing construct a parse tree?

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It starts from input symbols and moves upward to the root.

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What is backtracking in Top-Down Parsing?

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Top-Down Parsing may require backtracking, which can be inefficient if the grammar is complex.