Designing LR(O) Parser Part-1

Duration: 8 min

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Inside: a video lesson and guided study material.

Module outline

  1. General Intelligence & Reasoning: Analogy, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Blood Relations, Directions (Direction Test), Ranking, Order and Sequence, Logical Sequence Of Words, Syllogisms, Venn Diagram, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Selection Decision Table (Decision Making), Data Sufficiency, Puzzle Solving (Puzzles), Data Arrangement, Cubes & Dices, Calendar, Clock, Arithmetic, Number System, HCF LCM, Verbal Analogy (Word Based Analogy), Visual Recognition and Figure Completion, Paper Folding and Cutting, Transformation of Shapes, Clocks and Calendars, Direction Sense, Cubes and Dice, Patterns in Two-Dimensional Figures, Seating Arrangements, Analogy and Classification, Logical Deduction and Induction, Alphabet and Word Tests, Mathematical Operations, Series Completion, Simplification and Approximation, Coding and Decoding, Numerical Reasoning, Assembling and Grouping of Shapes, Three-Dimensional Patterns and Visualization, Vocabulary, Number System, Averages, Mixtures and Alligation, Simple and Compound Interest, Percentages, Algebra, Speed, Time and Distance, Seating and Arrangement Puzzles, Traverse Surveying, Order, Ranking and Sequence, Constraint Puzzles, Syllogisms and Venn Diagrams, Reading Comprehension, Critical Reasoning, Permutations and Combinations, Narrative Sequencing, Project Monitoring, Resources and Safety, Profit, Loss and Discount, Ratio and Proportion, Time and Work, Mensuration, Data Interpretation, Powers, Surds and Logarithms, Sequences and Series, Articles and Determiners, Sentence Completion, Data Sufficiency, Blood Relations, Simple Interest and Compound Interest, Mixture and Alligation, Sequence and Series (Series), Speed Time and Distance, Algebra, Profit and Loss, Powers and Exponents (Surds and Indices), Permutation and Combination
  2. General Awareness: Physics, Chemistry, Biology, History, Geography, Polity, Indian Economy, Environment, Static General Knowledge, GK- Current Affairs, Artificial Intelligence, MS Office Applications, Terms & Abbreviations, Keyboard Shortcuts, Evolution of Indian Banking (Banking & Financial Awareness), Emerging Tech Trends
  3. Engineering Mathematics: Set Theory, Relations, Functions, Graph Theory, Group Theory, Propositional and Predicate Logic, Linear Algebra, Calculus, Probability, Statistics, Signal Space and Optimum Detection, Probability, Statistics
  4. Digital Logic: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation, Floating Point Rep, Number Systems and Codes, Registers and Counters, Boolean Algebra and Logic Gates, Microprocessors and Microcontrollers, Logic Families and CMOS Logic, Microprocessors, Logic Gates and Boolean Algebra, Minimization of Boolean Functions, Timing, Hazards and Testing, Logic Families, Combinational Logic Design, Arithmetic Circuits, Waveform Generators and Timer Circuits, Semiconductor Memories and Programmable Logic Devices, Combinational Logic Circuits, Latches and Flip-Flops, Finite State Machines, Sequential Circuits and State Machines, Minimization of Boolean Functions, Arithmetic Circuits, Latches and Flip-Flops, Number Systems and Codes, Registers and Counters
  5. Computer Organisation & Architecture: Basics of COA, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Control Unit Design, Programming the Basic Computer, Register Transfer and Microoperations, Semiconductor Memories and Programmable Logic, Processor Organization and Instructions, Memory Hierarchy and Input/Output, Registers and Counters
  6. Programming & Data Structures: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling, Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, HTML Basics, OOPS with C++, Java, Object Oriented Technology
  7. Databases: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, SQL, Relational Calculus, Transaction Management, Concurrency Control, Database Recovery, Database Security & Authorization
  8. Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos
  9. 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
  10. 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
  11. Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management, Security, Windows OS, Distributed Systems, Unix OS, Linux OS
  12. Computer Networks: Introduction to CN, 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, Data Communication, Website, Browser & Services, Web Design & Development, Network Security, Cyber Threats and Malware Attacks, Cyber Safety and Security
  13. Full Length Mock Tests:
  14. Sectional Tests:
  15. Paper 2 - Full-length Mock Tests:
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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