Designing LR(O) Parser Part-5

Duration: 4 min

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Module outline

  1. About Course: About the Course
  2. Paper 1 | General Studies: State Wise GK
  3. Paper 1 | Information and Communication Technology: Role of Internet and Web Services, Security in Mobile and Wireless Computing
  4. Paper 1 | Current Affairs: GK- Current Affairs
  5. Paper 2 | Discrete Mathematical Structure: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Set Theory, Relations, Functions, Graph Theory, Group Theory, Propositional and Predicate Logic, Probability
  6. Paper 2 | Digital Computer Organization And Architecture: Number System, Number Representation, Sequential Circuits, Combinational Circuit, Basics of COA, Floating Point Rep, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Register Transfer and Microoperations, Control Unit Design, Programming the Basic Computer
  7. Paper 2 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  8. Paper 2 | Programming Languages & Object-Oriented Programming Concepts: Java, OOPS with C++, Java Fundamentals, Array, String, IO & References
  9. Paper 2 | Python: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis
  10. Paper 2 | Data Structure And Algorithms: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Minimum Spanning Trees, Advanced Algorithms
  11. Paper 2 | Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Unix OS
  12. Paper 2 | Theory Of Computation: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Moore & Mealy Machines, Pushdown Automata & CFG, Turing Machines, Complexity Theory
  13. Paper 2 | Compiler Design: Intro to Compilers, Lexical Analysis, Grammar & CFG, Syntax Analysis: Top-Down, Syntax Analysis: Bottom-Up, Semantic Analysis & SDT, Intermediate Code Gen, Code Optimization, Run Time Environment
  14. Paper 2 | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Algebra, SQL, Transaction Management, Concurrency Control, Database Recovery, Database Security & Authorization, Enhanced Data Models
  15. Paper 2 | Computer Network And Information Security: Introduction to CN, Data Communication, Application Layer, Hardware basics, Cyber Threats and Malware Attacks, Network Security, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP
  16. Paper 2 | Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  17. Paper 2 | Current Trends & Technologies: Emerging Tech Trends, Approaches to AI, Search Algorithms, Game Playing, Knowledge Representation, Planning, Multi Agent Systems, Fuzzy Sets, Natural Language Processing, Artificial Neural Networks, Genetic Algorithms, Artificial Intelligence, Data Warehousing & Mining, Electronic Data Interchange and E-Commerce, Terms & Abbreviations
  18. Paper 2 | Full Length Mock Tests:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The video lecture provides a detailed explanation of "Conflicts in LR(0) parser," a fundamental topic in compiler design. The instructor categorizes conflicts into two distinct types: "SR Conflicts (Shift Reduce)" and "RR Conflicts (Reduce Reduce)." He explains the specific conditions required for each conflict to occur within the states of a Deterministic Finite Automaton (DFA). For SR conflicts, he notes that they arise when a state contains both final and non-final items. For RR conflicts, he explains they happen when a state contains more than one final item. The lecture concludes by defining an "LR(0) Grammar" as an unambiguous grammar where the parse table is free from these multiple entries, ensuring deterministic parsing.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor starts by introducing the slide titled "Conflicts in LR(0) parser." He highlights the bullet points for "SR Conflicts (Shift Reduce)" and "RR Conflicts (Reduce Reduce)." He focuses on the SR conflict section, reading the text: "If the state of DFA contains both final & non-final items, then it is S-R conflicts." He points to the example rules A -> alpha.x beta (labeled as shift) and B -> delta . (labeled as reduced). To visualize this, he circles the production A -> alpha.x beta and the production B -> delta . with a red pen. He then draws a horizontal line with vertical dividers to represent the parse table or state structure, indicating where the shift and reduce actions would clash. He emphasizes that the presence of x (a terminal) necessitates a shift, while the dot at the end of B necessitates a reduction.

  2. 2:00 – 4:05 02:00-04:05

    The instructor transitions to the second type of conflict, "R-R Conflict." He reads the definition: "If the same state contains more than one final item, then it is R-R Conflict." He points to the example rules A -> alpha . and B -> alpha .. Although the text next to A says "(x is terminal, shift)", the instructor circles both A -> alpha . and B -> alpha . to show they are both final items causing a conflict. He then moves to the final bullet point defining "LR(0) Grammar." He reads the text: "An unambiguous grammar LR(0) parse table is free from multiple entries, i.e. free both SR & RR conflicts, is LR(0) grammar." He circles the title "Conflicts in LR(0) parser" again to summarize the entire topic covered in the session.

The lecture progresses logically from identifying specific conflict types to defining the grammar that avoids them. By visually circling the conflicting production rules and drawing diagrams, the instructor clarifies the abstract concepts of shift-reduce and reduce-reduce conflicts. The final definition establishes that a grammar is LR(0) only if its parse table contains no such ambiguities.

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