'Terminal symbol' diaporamas de présentation

Chapter 3 Describing Syntax and Semantics

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Chomsky & Greibach Normal Forms

Chomsky & Greibach Normal Forms. Hector Miguel Chavez Western Michigan University. Presentation Outline. Introduction Chomsky normal form Preliminary simplifications Final steps Greibach Normal Form Algorithm (Example) Summary. Introduction. Grammar: G = (V, T, P, S). T = { a, b }.

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COSC 3340: Introduction to Theory of Computation

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Properties of Context-Free Languages

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Chapter 6 Simplification of CFGs and Normal Forms

Chapter 6 Simplification of CFGs and Normal Forms. 6.1: Methods for Transforming Grammars (1) A Useful Substitution Rule. Theorem 6.1 : This intuitive theorem allows us to simplify grammars.

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Context-Free Grammars

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Chapter 2.2

Chapter 2.2. Programming Language Definition. Syntax and Semantics Semantics definition Denotational Semantics Elementary actions Syntax definitions Backus-Naur Formalism Syntax diagrams. Summary. Syntax = form Semantics = meaning Example My beer is on the table Syntax : OK

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CSCI 115

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Parse : v.

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Closure Properties of Regular Languages

Closure Properties of Regular Languages. Re gular languages are closed under many set operations. Let L 1 and L 2 be regular languages. (1) L 1 ? L 2 (the union) is regular. (2) L 1 L 2 (the concatenation) is regular.

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Context-Free Grammars, Part 2

MA/CSSE 474 Theory of Computation. Context-Free Grammars, Part 2. Your Questions?. This is quite a "complement" to Euclid!. Previous class days' material Reading Assignments. HW 9 problems Exam 2 Anything else. CFG for Simple Arithmetic Expressions. G = ( V , ? , R , E ), where

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System Software Unit-1 (Language Processors) A TOY Compiler

System Software Unit-1 (Language Processors) A TOY Compiler. Prepared By :- Bhavin Dalsaniya MEFGI-MCA Studant. The Front End. The front end performs Lexical Analysis Syntax Analysis Semantic Analysis of the source program. Each kind of analysis involves the following functions

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Top-down Parsing

By Georgi Boychev, Rafal Kala, Ildus Mukhametov. Top-down Parsing. Outline. Introduction. Directional top-down parsing. Imitating leftmost derivations. The pushdown automaton. Breadth-first top-down parsing. Depth-first (backtracking) parsers. Conclusion. Introduction.

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? 4 ? ?? ??

???? ??. ? 4 ? ?? ??. Lexical Analysis the process by which the compiler groups certain strings of characters into individual tokens. Lexical Analyzer ? Scanner ? Lexer. 4.1 ? ?. Token ????? ?? ?? ?? ?? Token - a single syntactic entity(terminal symbol).

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Discussion #4 Ambiguity & Precedence Grammars

Discussion #4 Ambiguity & Precedence Grammars. Topics. Ambiguity Precedence Grammars Grammar Reductions. Problems with Grammars. We are heading towards grammars that are reasonable , get the job done , and for which we can find efficient parsing algorithms . Not all grammars are usable!

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CONVERSION OF A CFG INTO A CHOMSKY NORMAL FORM

SRIKANTH PATHURI THEORY OF AUTOMATA, SPRING 2012. CONVERSION OF A CFG INTO A CHOMSKY NORMAL FORM. Definition: A CFG is said to be in Chomsky normal form if every production is of one of these two types: A->BC (where B and C are variables) A-> ? (where ? is a terminal).

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331 Final

331 Final. Fall 2010. Details. 3:30-5:30 Friday December 17 th LH4 Comprehensive with more emphasis on material since the midterm Study example finals and midterm exams from Fall 2008 and Spring 2010 Read all assigned material from book and schedule. Example Problem.

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Context Free Grammars

Context Free Grammars. CFGs Add recursion to regular expressions Nested constructions Notation expression ? identifier | number | - expression | ( expression ) | expression operator expression operator ? + | - | * | / Terminal symbols

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Last Lecture

Last Lecture. We began to show CFL = PDA Theorem 1 . Every context-free language is accepted by some PDA. Theorem 2 . For every PDA M, the language L(M) is context-free.

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Three kinds of bottom-up LR parser

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