Parsing
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Topic: LL1 Parsing
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- Topic: Parsing Problem 2. Consider the following context-free grammar What is the language L described by the grammar? Compute the first sets for S, X, and Y. You must show the iterations of the algorithm separately Compute the follow sets for S, X, and Y. You must show the iterations of the algorithm separately Construct the LL(1) parsing table for the grammar. It is enough to just show the table Show the steps in parsing the strings from L1. Use the algorithm described in our course materials (videos) that takes a CFG and converts it into a CNF grammar that generates the same language as the original grammar, except possibly for the string A, to answer the following question. As part of your answer, you should say which variables are nullable, and you should give the appropriate grammar after each step of the algorithm. There are four steps. Give a CFG (context-free grammar) in CNF (Chomsky Normal Form) that generates the same language, except possibly for the string A, as the following grammar: S АВ → abA|A → bBb|bb A BConvert Context-free grammar to CNF.X→ YaXbY→aY|aX is start symbolIf you are using any new variable for conversion then name of each variable symbol should be first two alphabets of your name with roll number and then you can increment value of roll numberExample (Sh10, Sh11, Sh12)
- Q 2 - Give bottom up parser LR(0) and SLR(1) for the following input strings and grammars a. The input string is 000111 and the grammar is S-> 0 S 1 | 0 1 b. The input string is aaa*a++ and the grammar is S -> SS+|SS * | aConsider the following grammar and parsing table: (1) S -> iSeS (2) S ->iS (3) S -> a, Process the string "iiaeaea" using the table and showing the steps for processing each input. Remember that each input string has an implied $ at the end of itComputer Science Consider the following two grammars with alphabet a and b i. (b*ab*a)*b* ii. (b*ab*a)*b*(b*ab*a)*b* Are there any strings are generated by one of the grammars and cannot be generated by the other? If there are more than one such string, how do you describe them.
- 1. Consider the following grammar: E->E+T|T T->T* F|F F-> (E)| a|b a) Build the parser table for this grammar based on the SLR method. (Simple LR parser) b) Build the parser table for this grammar based on the LALR method. (Look-Ahead LR parser)5. How to convert a Regular Expression to left-linear grammar (0+1)*00(0+1)* 6. Define regular expression and regular set. Find an equivalent regular expression to the following DFA- qo1. The grammar is known as follows:P → H | PbdHH → a | (P)Asked:c. Please check the parsing movement with input: abda
- Show that the following grammar is ambiguous – show two distinct parse trees for one terminal string. E? E + E | idCreate a context-free grammar G1 for L1 = { ckanbn: k >=0, n>=0 }. Find the leftmost derivations for the following strings using grammar G1: aaabbb caabb ccaaabbb ccccab. Create parse trees for your grammar G1 ( Problem 1) for each of the following strings in L1: aaabbb caabb ccaaabbb ccccab.A variable name consists of only one letter. The non-terminal S is the start symbol. S = T V ; V = C , V | C T = float C = a-z We want to design an LR parser for this grammar. Create a complete parsing DFA, showing the closure for all states including the parsing marker in every rule, and transitions between the states. You can use the symbol @ as the parsing marker. States need to be numbered or named. You may write all required information in a table instead of drawing a DFA. There is no need to add $ at the end of start rule since there is a terminal at the end, i.e. the semicolon.