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Simplifications of Context-Free Grammars

Simplifications of Context-Free Grammars

Simplifications of Context-Free Grammars. A Substitution Rule. Equivalent grammar. Substitute. A Substitution Rule. Substitute. Equivalent grammar. In general:. Substitute. equivalent grammar. Nullable Variables. Nullable Variable:. Removing Nullable Variables. Example Grammar:.

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519 views • 51 slides
Simplifications of Context-Free Grammars

Simplifications of Context-Free Grammars

Simplifications of Context-Free Grammars. A Substitution Rule. equivalent grammar. substitute B. In general:. substitute B. equivalent grammar. Useless Productions. never terminates. Useless Production. Another grammar:. Not reachable from S. Useless Production. In general:. If.

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499 views • 49 slides
Compilers

Compilers

Compilers. Machine Code. Program. Add v,v,0 cmp v,5 jmplt ELSE THEN: add x, 12,v ELSE: WHILE: cmp x,3. v = 5; if (v>5) x = 12 + v; while (x !=3) { x = x - 3; v = 10; }. Compiler. Compiler. Lexical analyzer. parser. input. output. machine code. program.

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CSCI 3130: Formal languages and automata theory Tutorial 4

CSCI 3130: Formal languages and automata theory Tutorial 4

CSCI 3130: Formal languages and automata theory Tutorial 4. Chin. Reminder. Homework 3 is due on next Thursday . You can get back homework 1 after this tutorial. Context Free Grammar. A ? 0A1 A ? B B ? #. start variable. variables. terminals. productions. A. ? 0A1. ? 00A11.

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705 views • 46 slides
Simplifications of Context-Free Grammars

Simplifications of Context-Free Grammars

Simplifications of Context-Free Grammars. A Substitution Rule. Equivalent grammar. Substitute. Substitute. Equivalent grammar. In general:. Substitute. equivalent grammar. Nullable Variables. Nullable Variable:. Example:. Nullable variable. Removing. Substitute.

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387 views • 38 slides
Simplification of Grammars

Simplification of Grammars

Simplification of Grammars. Lecture 17 Naveen Z Quazilbash. Overview. Attendance Motivation Simplification of Grammars Eliminating useless variables Eliminating null productions Eliminating unit productions Quiz result. Motivation for grammar simplification. Parsing Problem

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462 views • 29 slides
CSCI 3130: Automata theory and formal languages

CSCI 3130: Automata theory and formal languages

Fall 2010. The Chinese University of Hong Kong. CSCI 3130: Automata theory and formal languages. Ambiguity Parsing algorithm for CFGs. Andrej Bogdanov http://www.cse.cuhk.edu.hk/~andrejb/csc3130. Ambiguity. A grammar is ambiguous if some strings have more than one parse tree.

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267 views • 26 slides
CSC 3130: Automata theory and formal languages

CSC 3130: Automata theory and formal languages

Fall 2008. The Chinese University of Hong Kong. CSC 3130: Automata theory and formal languages. Normal forms and parsing. Andrej Bogdanov http://www.cse.cuhk.edu.hk/~andrejb/csc3130. Testing membership and parsing. Given a grammar How can we know if a string x is in its language?

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328 views • 22 slides
CSC 3130: Automata theory and formal languages

CSC 3130: Automata theory and formal languages

Fall 2009. The Chinese University of Hong Kong. CSC 3130: Automata theory and formal languages. Normal forms and parsing. Andrej Bogdanov http://www.cse.cuhk.edu.hk/~andrejb/csc3130. Testing membership and parsing. Given a grammar How can we know if a string x is in its language?

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298 views • 22 slides

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