Top-Down Parsing/Exercise 7: Difference between revisions
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= Problem = | == Problem == | ||
Consider the following grammar, where '''<tt>A</tt>''' is the initial symbol and '''<tt>{a,b,c,d,e}</tt>''' is the set of terminal symbols: | Consider the following grammar, where '''<tt>A</tt>''' is the initial symbol and '''<tt>{a,b,c,d,e}</tt>''' is the set of terminal symbols: | ||
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X -> a | X -> a | ||
A -> X c A e | M b | A -> X c A e | M b | ||
M -> A c | X c d | | M -> A c | X c d | ε | ||
# Examine the grammar and rewrite it so that an LL(1) predictive parser can be built for the corresponding language. | # Examine the grammar and rewrite it so that an LL(1) predictive parser can be built for the corresponding language. | ||
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# Show the analysis table (stack, input, and actions) for the parsing process of the '''<tt>acbe</tt>''' input sequence. | # Show the analysis table (stack, input, and actions) for the parsing process of the '''<tt>acbe</tt>''' input sequence. | ||
= Solution = | == Solution == | ||
[[Image:CompilersTopDownParsingExercise7.jpg|700px]] | [[Image:CompilersTopDownParsingExercise7.jpg|700px]] | ||
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Latest revision as of 14:04, 30 April 2024
Problem
Consider the following grammar, where A is the initial symbol and {a,b,c,d,e} is the set of terminal symbols:
X -> a A -> X c A e | M b M -> A c | X c d | ε
- Examine the grammar and rewrite it so that an LL(1) predictive parser can be built for the corresponding language.
- Compute the FIRST and FOLLOW sets for all non-terminal symbols in the new grammar and build the parse table.
- Show the analysis table (stack, input, and actions) for the parsing process of the acbe input sequence.
Solution
