'Next symbol' presentation slideshows

Compilation 0368-3133 (Semester A, 2013/14)

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Top-Down Parsing I

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COSC 3340: Introduction to Theory of Computation

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Top-Down Parsing

Top-Down Parsing. The parse tree is created top to bottom. Top-down parser Recursive-Descent Parsing Backtracking is needed (If a choice of a production rule does not work, we backtrack to try other alternatives.) It is a general parsing technique, but not widely used. Not efficient

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Parsing #2

Leonidas Fegaras. Parsing #2. Bottom-up Parsing. Rightmost derivations; use of rules from right to left Uses a stack to push symbols the concatenation of the stack symbols with the rest of the input forms a valid bottom-up derivation E - num x-2*y$ stack input

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Special Topics in Computer Science The Art of Information Retrieval Chapter 7: Text Operations

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Compiler Design 5 . Top-Down Parsing with a Recursive Descent Parser

Kanat Bolazar February 2, 2010. Compiler Design 5 . Top-Down Parsing with a Recursive Descent Parser. Parsing. Lexical Analyzer has translated the source program into a sequence of tokens The Parser must translate the sequence of tokens into an intermediate representation

434 views • 20 slides

An Introduction to Stream Ciphers

An Introduction to Stream Ciphers. Zahra Ahmadian Electrical Engineering Department Sahrif University of Technology ahmadian@ee.sharif.ir. Overview . The development of stream ciphers Two types of stream ciphers Synchronizing stream ciphers Self synchronizing stream ciphers

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Expression Trees

Expression Trees. What is an Expression tree? Expression tree implementation Why expression trees? Evaluating an expression tree (pseudo code) Prefix, Infix, and Postfix forms Infix to Postfix conversion Constructing an expression tree from a postfix expression. What is an Expression tree?.

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Pushdown automata

Pushdown automata. Programming Language Design and Implementation (4th Edition) by T. Pratt and M. Zelkowitz Prentice Hall, 2001 Section 3.3.4- 4.1. Chomsky Hierarchy. Regular Grammar (Type 3) ? Finite State Machine Context-free Grammar (Type 2) ? Push down automata

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Confucius

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Arithmetic Coding: Basic Ideas

Arithmetic Coding: Basic Ideas. Example. Encoding First Symbol. Next Symbol. Encoding Algorithm. Results. Decoding. Decoding Algorithm. Decoding Results. 0.1. 0.2.

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Forward U S M. Backward U S M. [0.02 0.01 0.63 0.53 0.41]. [0.07 0.30 0.52 0.67 0.37] . USM Algorithm Mapping of a sequence X into a continuous space

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