Designing LR(O) Parser Part-1

Duration: 8 min

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Module outline

  1. Quantitative Aptitude: Ratio and Proportion (Ratios), Data Interpretation, Mixture and Alligation, Permutation and Combination, Number System, Sequence and Series (Series), Speed Time and Distance, Speed Mathematics and Basic Mathematics, Algebra, Percentage, Profit and Loss, Simple Interest and Compound Interest, Powers and Exponents (Surds and Indices), Time and Work, Mensuration and Geometry, Partnership
  2. Reasoning Ability: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Seating Arrangements, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Directions (Direction Test), Ranking, Order and Sequence, Syllogisms, Blood Relations, Puzzle Solving (Puzzles), Inequality, Machine Input-Output
  3. English Language: Vocabulary, Noun, Subject Verb Agreement (Verb Noun Agreement), Adjectives, Tenses, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Sentence Construction, Pronoun, Preposition, Conjunction, Adverb, Verb, Modals, Articles, Determiner, Interjection
  4. General Awareness: Evolution of Indian Banking (Banking & Financial Awareness), GK- Current Affairs, Static General Knowledge, Indian Economy
  5. C Concepts + MCQs (IT Specialist): C Programming by Yash Sir, C Language Core
  6. Java (IT Specialist): Java
  7. Python (IT Specialist): Python for Placements by Yash Sir, Python Basics
  8. OOPs (IT Specialist): Object Oriented Programming (OOPS)
  9. DBMS (IT Specialist): Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, Relational Calculus, Transaction Management, Concurrency Control, Database Recovery, ORDBMS, Database Security & Authorization, Query Processing & Optimization, Enhanced Data Models, Data Warehousing & Mining, Big Data Systems, NoSQL
  10. SQL (IT Specialist): SQL
  11. Software Engineering (IT Specialist): Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  12. Data Structure (IT Specialist): Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  13. Operating System (IT Specialist): Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Windows OS, Linux OS, Security, Distributed Systems, Virtual Machines
  14. Compiler Design (IT Specialist): 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
  15. Computer Architecture (IT Specialist): Basics of COA, Floating Point Rep, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Control Unit Design, Register Transfer and Microoperations, Multiprocessors, Programming the Basic Computer
  16. Data Communication & Networking (IT Specialist): Introduction to CN, Data Communication, 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, Application Layer, Hardware basics, Network Security
  17. Descriptive Test (Main Exam): English Writing Ability
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video provides a step-by-step demonstration of constructing a Canonical LR(0) Parsing Table or Automaton for a specific context-free grammar. The lecture begins with the grammar A -> aA / b. The instructor, Sanchit Jain Sir, starts by augmenting the grammar to handle the start symbol correctly, introducing a new production A' -> A. He then systematically builds the states of the automaton, starting with the initial state I0. The process involves computing the closure of items and shifting symbols to generate subsequent states. The video concludes with a complete state transition diagram illustrating the flow between states I0 through I4, including self-loops and transitions on terminals and non-terminals.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The session opens with the instructor writing the grammar A -> aA / b in orange text at the top left. He proceeds to augment the grammar by writing A' -> A in red ink. He lists the full set of productions: A' -> A, A -> aA, and A -> b. He then begins the construction of the initial state, denoted as I0. He writes the item A' -> .A, placing a dot before the non-terminal A. Since the dot precedes a non-terminal, he explains the need to compute the closure. He adds the productions for A with the dot at the beginning: A -> .aA and A -> .b. These three items are grouped together in a box, representing the complete set of items for the initial state I0.

  2. 2:00 – 5:00 02:00-05:00

    The instructor moves to derive transitions from the initial state I0. He identifies a transition on the non-terminal 'A', which leads to a new state I1. In I1, the item is A' -> A., indicating the completion of the start symbol. Next, he considers the transition on terminal 'a'. Shifting the dot in A -> .aA results in A -> a.A. This forms the basis of state I2. He computes the closure for I2 by adding A -> .aA and A -> .b because the dot is again before A. He also identifies a transition on terminal 'b' from I0, leading to state I3 containing the item A -> b.. Finally, he transitions from I2 on non-terminal 'A', shifting the dot in A -> a.A to get A -> aA., which forms state I4.

  3. 5:00 – 7:35 05:00-07:35

    In the final segment, the instructor completes the state transition diagram. He draws an arrow from state I2 labeled 'a' looping back to itself, indicating that after reading 'a', the automaton remains in a state expecting 'A' or 'b'. He draws a transition from I2 labeled 'b' leading to state I3. Unusually, he also draws a transition from state I3 labeled 'b' looping back to I3. The final board displays the five states: I0 with items A' -> .A, A -> .aA, A -> .b; I1 with A' -> A.; I2 with A -> a.A, A -> .aA, A -> .b; I3 with A -> b.; and I4 with A -> aA.. The diagram visually connects these states with red arrows labeled with the triggering symbols.

The lecture effectively demonstrates the mechanical process of LR(0) automaton construction. By starting with the augmented grammar and iteratively applying closure and goto operations, the instructor builds a finite state machine that recognizes the language defined by the grammar. The visual progression from the initial closure to the final transition diagram provides a clear template for students to follow when solving similar problems in compiler design. The inclusion of specific state transitions and the final diagram serves as a comprehensive reference for understanding the parsing structure.

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