Designing LR(O) Parser Part-2

Duration: 7 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 features an educational lecture by Sanchit Jain from Knowledge Gate on constructing a parsing table for a specific context-free grammar. The grammar presented is A' -> A and A -> aA / b. The instructor begins by displaying a state diagram (DFA) that represents the LR(0) items for the grammar. He systematically explains the transitions between states I0 through I4. He then proceeds to construct a parsing table with columns for 'Action' (terminals a, b, $) and 'Goto' (non-terminal A). The lecture covers filling in shift, reduce, and goto actions based on the items in each state, culminating in a completed table and a brief mention of a sample string "abab".

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor starts by reviewing the state diagram. State I0 contains items A' -> .A, A -> .aA, and A -> .b. He points out transitions: 'A' leads to I1, 'a' leads to I2, and 'b' leads to I3. State I1 contains A' -> A.. State I2 contains A -> a.A, A -> a.aA, and A -> a.b. State I3 contains A -> b.. State I4 contains A -> aA.. The instructor highlights the transitions and the items within each box to establish the foundation for the parsing table. He specifically points to the items in I0 and traces the arrows to I1, I2, and I3.

  2. 2:00 – 5:00 02:00-05:00

    He draws a table with headers 'Action' (sub-columns a, b, $) and 'Goto' (sub-column A). He starts filling the row for I0. On input 'a', he writes S2 (shift to state 2). On input 'b', he writes S3 (shift to state 3). On input 'A' in the Goto column, he writes 1. For row I1, since it contains A' -> A., he marks the '$' column as "Accept". He explains that this indicates successful parsing of the start symbol. He fills the first row completely before moving to the next.

  3. 5:00 – 6:53 05:00-06:53

    He continues filling the table. For row I2, on 'a' he writes S4, and on 'b' he writes S3. For row I3, which has A -> b., he writes R2 (reduce by production 2) in the action columns. For row I4, which has A -> aA., he writes R1 (reduce by production 1) in the action columns. Finally, he writes "abab" at the bottom as an example string to be parsed using the constructed table. The table is now mostly complete with shift and reduce actions filled in.

The lecture demonstrates the direct mapping between the LR(0) state diagram and the parsing table. Shift actions correspond to transitions on terminals, Goto actions correspond to transitions on non-terminals, and Reduce actions correspond to states containing completed items (dot at the end). The process transforms the theoretical state machine into a practical parsing mechanism. The instructor uses the example string "abab" to hint at the next step of parsing the string.

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