'Input symbol' diaporamas de présentation

Turing Machines

Turing Machines. The Language Hierarchy. ?. ?. Context-Free Languages. Regular Languages. Languages accepted by Turing Machines. Context-Free Languages. Regular Languages. A Turing Machine. Tape. . . Read-Write head. Control Unit. The Tape. No boundaries -- infinite length.

1.15k views • 101 slides

Thopson NFA

Thopson NFA. Presenter : Yuen- Shuo Li Date : 2014/5/7. Department of Computer Science and Information Engineering National Cheng Kung University, Taiwan R.O.C. Introduction. A regular expression (regex or regexp for short) is a special text string for describing a search pattern.

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CPE555A: Real-Time Embedded Systems

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Pushdown Automata

802 views • 55 slides

LR Parsing Table Costruction

LR Parsing Table Costruction. Lecture 6 Syntax Analysis. LR parsing example. Grammar: E -> E + T E -> T T -> T * F T -> F F -> ( E ) F -> id. LR parsing example. CONFIGURATIONS STACK INPUT ACTION 0 id * id + id $ shift 5.

882 views • 47 slides

Compiler Construction Syntax Analysis

Compiler Construction Syntax Analysis. Goals of parsing. Every Programming language has syntactic rules Decide whether program satisfies syntactic structure Error detection Error recovery Simplification: rules on tokens Build A bstract S yntax T ree. E. E. +. E. num. (. E. ).

1.44k views • 41 slides

Pushdown Automata (PDA)

Pushdown Automata (PDA). Informally: A PDA is an NFA-? with a infinite stack. Transitions are modified to accommodate stack operations. Questions: What is a stack? How does a stack help?

1.46k views • 38 slides

Introduction to Finite Automata

Introduction to Finite Automata. Languages Deterministic Finite Automata Representations of Automata. Alphabets. An alphabet is any finite set of symbols. Examples : ASCII, Unicode, {0,1} ( binary alphabet ), {a,b,c}. Strings.

596 views • 37 slides

System Models

Lecture 6 & 7. System Models. Hoang Huu Hanh, Hue University hanh-at-hueuni.edu.vn. System models are abstract descriptions of systems whose requirements are being analysed. Objectives To explain why the context of a system should be modelled as part of the RE process To describe

469 views • 36 slides

Shift/Reduce and LR(1)

Shift/Reduce and LR(1). Professor Yihjia Tsai Tamkang University. Table-driven parsing. Parsing performed by a finite state machine. Parsing algorithm is language-independent. FSM driven by table (s) generated automatically from grammar.

471 views • 34 slides

Shift/Reduce and LR(1)

Shift/Reduce and LR(1). CMSC 431 Shon Vick. Table-driven parsing. Parsing performed by a finite state machine. Parsing algorithm is language-independent. FSM driven by table (s) generated automatically from grammar. Language generator tables. Input. parser.

541 views • 34 slides

CMSC 723 / LING 645: Intro to Computational Linguistics

CMSC 723 / LING 645: Intro to Computational Linguistics. September 8, 2004: Monz Regular Expressions and Finite State Automata (J&M 2) Prof. Bonnie J. Dorr Dr. Christof Monz TA: Adam Lee. Regular Expressions and Finite State Automata. REs: Language for specifying text strings

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6.1 ?? ?? ??

6.1 ?? ?? ??. How to check whether an input string is a sentence of a grammar and how to construct a parse tree for the string.

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Cryptographic Attacks on Scrambled LZ-Compression and Arithmetic Coding

Cryptographic Attacks on Scrambled LZ-Compression and Arithmetic Coding. By: RAJBIR SINGH BIKRAM KAHLON. Outline. LZ Compression Arithmetic Coding

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DFA Minimization

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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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Nondeterminism and Nodeterministic Automata

Nondeterminism and Nodeterministic Automata. Nondeterminism and Nondeterministic Automata.

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Predictive Parser

Predictive Parser. Grammar and Algorithm }. Predictive parsers can be constructed for a class of grammars called LL(1). L->Left L->Leftmost derivation 1->One input symbol at each step No left recursive or ambiguous grammar can be LL(1). LL(1) Grammar.

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Introduction to Turing Machines

Introduction to Turing Machines. 0. 0. 1. 1. 0. 1. 1. 1. 1. 1. 1. 1. 0. 1. 1. 0. 1. 1. 0. 0. 0. The Turing Machine. 0. 1. 1. 0. 1. 0. 1. 1. 1. 1. 1. 1. 1. 0. 1. 1. 0. 1. 1. 0. 0. 0. A TM consists of an infinite length tape, on which

441 views • 10 slides

Minimizing the number of states in DFAs

Minimizing the number of states in DFAs. Paul Richardson Student Lecture 6 November Course 08.73.11 Algorithms, Logic and Complexity University of Iceland Department of Computer Science. DFA use. DFA much used as pattern recogniser e.g.: in compilers in text processing .

209 views • 10 slides