Designing LR(O) Parser Part-3

Duration: 6 min

This video lesson is available to enrolled students.

Return to /learn/MPPSC-ASSISTANT-PROFESSOR-COMPUTER-SCIENCE-PAPER-2/compiler-design/syntax-analysis-bottom-up/intro-to-bottom-up-lr0/asset-designing-lro-parser-part-3 after enrolling

Inside: a video lesson and guided study material.

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.

This educational video provides a detailed walkthrough of LR(0) parsing construction and execution. The instructor begins by defining a context-free grammar with productions A' -> A and A -> aA / b. He displays the corresponding LR(0) item sets and the resulting deterministic finite automaton (DFA) states labeled I0 through I4. A parsing table is constructed with Action and Goto columns. The core of the lecture demonstrates the parsing process for the input string 'abab'. The instructor meticulously traces the stack operations, showing shifts and reductions based on the parsing table entries. He concludes by visualizing the derivation through a parse tree, reinforcing the connection between the stack trace and the syntactic structure of the input string.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The lecture opens with the grammar definition A' -> A and A -> aA / b written in orange at the top left. The instructor presents the LR(0) items in red boxes, identifying states I0, I1, I2, I3, and I4. To the right, a parsing table is drawn with columns for terminals a, b, $ and non-terminal A. The instructor writes the input string 'abab' in blue ink to begin the trace. He initializes the parsing stack with the initial state 0, marking the start of the shift-reduce parsing process.

  2. 2:00 – 5:00 02:00-05:00

    The instructor executes the trace for 'abab'. He shifts the first 'a' to state 2, writing '0 a 2' on the stack. The second 'a' is also shifted to state 2, resulting in '0 a 2 a 2'. The 'b' is shifted to state 3. Upon reaching state 3, a reduction occurs. The instructor identifies rule 4 (A -> b) and reduces the top of the stack. He pops 'b 3' and pushes 'A' along with the goto state 4 from state 2. The stack updates to '0 a 2 A 4'. He continues this process, reducing 'aA' to 'A' using rule 1, updating the stack to '0 A 1'.

  3. 5:00 – 5:52 05:00-05:52

    The parsing trace concludes with the final reductions. The instructor reduces the remaining 'A' to the start symbol A' using the augmented production. The final stack state is shown as '0 A' 1 $', indicating acceptance. To visualize the result, he draws a parse tree on the right side. The tree has A' at the root, branching down to A, which further branches into 'a' and 'A', eventually matching the input sequence 'abab'. This visual aid connects the abstract stack operations to the concrete syntactic structure.

The video effectively bridges the gap between theoretical LR(0) construction and practical parsing execution. By starting with the grammar and automaton, the instructor establishes the necessary framework. The step-by-step trace of 'abab' serves as a concrete example of how the parsing table drives the stack operations. The final parse tree synthesis confirms that the shift-reduce actions correctly recognized the input string, validating the parsing table construction.

Loading lesson…