Bottom Up Parser Fundamentals Part-1

Duration: 8 min

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Module outline

  1. About Course: About the Course
  2. Section A: General Awareness: Polity, Physics, Biology, Chemistry, Static General Knowledge, History, Geography, Indian Economy, GK- Current Affairs, Evolution of Indian Banking (Banking & Financial Awareness), Environment
  3. Section A: General Intelligence & Reasoning ability: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Analytical Reasoning (Counting Figures Reasoning), Blood Relations, Syllogisms, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Seating Arrangements, Directions (Direction Test), Puzzle Solving (Puzzles), Calendar, Clock, Cubes & Dices, Selection Decision Table (Decision Making), Logical Sequence Of Words, Crypt Arithmetic, Venn Diagram, Data Arrangement, Inequality, Analogy, Ranking, Order and Sequence, TCS NQT Advanced Reasoning Ability
  4. Section A: Arithmetical & Numerical Ability: Ratio and Proportion (Ratios), Divisibility Rules, Data Interpretation, Mixture and Alligation, Permutation and Combination, Logarithm, Number System, HCF LCM, Sequence and Series (Series), Speed Time and Distance, Percentage, Average, Profit and Loss, Simple Interest and Compound Interest, Time and Work, Pipe and Cistern, Mensuration and Geometry, Powers and Exponents (Surds and Indices), Algebra, Probability, Mental Ability, Age Problems, Partnership, Statistics, Arithmetic, Speed Mathematics and Basic Mathematics, Miscellaneous
  5. Section A: English Language & Comprehension: Vocabulary, Subject Verb Agreement (Verb Noun Agreement), Adjectives, Tenses, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Articles, Sentence Construction, Preposition, Direct and Indirect Speech, Sentence Completion (Fill in the blanks), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Modals, Active Passive Voice (Voice), Sentence Correction (Error Correction), Adverb, Conjunction, Cloze Test (Cloze Passage)
  6. Section A: Hindi Language & Comprehension: भाषा, लिपि, ध्वनि, वर्ण, अक्षर, स्वर, व्यंजन, मात्रा और संयुक्ताक्षर, वर्तनी, वर्ण-विन्यास, अनुस्वार, अनुनासिक, चंद्रबिंदु और ‘र’ के रूप, शब्द, पद और शब्द-भेद, संज्ञा और सर्वनाम, विशेषण और क्रिया, लिंग, वचन, पुरुष और कारक, काल, वाच्य, वाक्य और वाक्य-भेद, संधि, समास, विलोम शब्द, पर्यायवाची शब्द, सामान्य अशुद्धियाँ, अनेक शब्दों के लिए एक शब्द, मुहावरे और लोकोक्तियाँ, अपठित गद्यांश और अपठित पद्यांश, Multi-Topic Content (Cross-Concept Material), वर्णमाला
  7. Section B: Programming, Data Structures, OOP & Java: 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, Java, OOPS with C++, Language Design, Intro to Compilers, Visual Basics, Syntax Analysis: Bottom-Up, Object Oriented Technology
  8. Section B: Computer Networks, TCP/IP & Network Security: Introduction to CN, Data Communication, DLL: Flow Control, DLL: Access Control, DLL: Error Control, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics, Network Access Technologies, Network Security, Society, Law & Ethics, Mobile Computing, Net Layer:Routing Protocol, Cyber Safety and Security
  9. Section B: Teaching Methodology: Child Development, Concept of Pedagogy, Theories, Inclusive Education, Experiential Pedagogy, Assessment & Evaluation, Curriculum Framework & Reforms, National Education Policy (NEP) 2020, Psychology, Teaching-Learning Process, Personality Development, Teaching Methods & Strategies, Learning and Motivation, Learners & Learning Process, Factors Affecting Teaching, Methods of Teaching, Nature, Objectives & Characteristics of Teaching, Teaching-Learning Aids & ICT Integration, Classroom Management & Communication, Evaluation, Assessment & Measurement, Curriculum & School Environment, Inclusive Education & Special Needs, Professional Development & Ethics
  10. Section B: Digital Electronics / Boolean Logic: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation, Analog-Digital Conversion
  11. Section B: Operating Systems & Linux: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, File Management, Disc Scheduling, Unix OS, Linux OS, Distributed Systems, Windows OS
  12. Section B: Data Base Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Algebra, SQL, File Organization & Indexing, Transaction Management, Concurrency Control, Database Security & Authorization, Database Recovery, Data Warehousing & Mining
  13. Section B: Internet & Web Technologies: Website, Browser & Services, Internet Fundamentals, Web Design & Development, Protocols & Services, Web Publishing & Hosting, Server Side & Security, HTML Basics, CSS, Emerging Technologies, JavaScript-Basics, .Net Programming, Electronic Data Interchange and E-Commerce, XML
  14. Section B: Computer Fundamentals, IT Basics & Architecture: Basics of COA, Cache Memory Organization, Input Output Organisation, Register Transfer and Microoperations, Control Unit Design, Programming the Basic Computer, Terms & Abbreviations, MS Office Applications, Instr Formats & Modes, Floating Point Rep
  15. Section B: Python Language: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis
  16. Section B: Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management, extras, Fundamentals of Systems and Information Systems
  17. Section B: Design & Analysis of Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos, Advanced Algorithms
  18. Section B: Mathematics: Linear Algebra, Calculus, Trigonometry, Vectors, Set Theory, Functions, Relations, Propositional and Predicate Logic, Research Process Steps, Graph Theory
  19. Section B: Computer Graphics, Multimedia & Mobile Computing: Basics of Computer Graphics, 2-D Geometrical Transforms and Viewing, 3-D Object Representation, Geometric Transformations and Viewing, Multimedia
  20. Section B: Emerging Trends: Emerging Tech Trends, Knowledge Representation, Natural Language Processing
  21. DSSSB Previous Year Paper:
  22. Business Studies and Management: Business Communication, Business Organization and Management, Financial Accounting, Business Economics, Management Information System (MIS), Knowledge Management & New Economy
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The video lecture provides a comprehensive introduction to Bottom-Up Parsing within the field of Compiler Design. It begins by situating Bottom-Up parsers within a hierarchical classification of all parsers, specifically distinguishing them from Top-Down parsers. The instructor details the sub-categories of Bottom-Up parsers, including L-R parsers (LR(0), SLR(1), CLR(1), LALR(1)) and Operator Precedence parsers. The core of the lecture defines the Bottom-Up process as constructing a parse tree from the leaves (children) up to the root. This is illustrated with a specific grammar example (S -> aABc) and input string (w = abcdc), where the instructor manually draws the tree and identifies 'handles' like 'bc' and 'd'. The concept of 'Handle Pruning' is introduced as the mechanism of replacing a handle with its corresponding non-terminal. The lecture concludes by comparing the efficiency of Bottom-Up parsing against Top-Down parsing, citing time complexities of O(n^3) versus O(n^4), and begins a new example to demonstrate the parsing table structure.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor starts with a visual flowchart classifying parsers into Top-Down and Bottom-Up categories. He focuses on the Bottom-Up branch, pointing out that it divides into 'L-R Parser' and 'Operator Precedence Parser'. He specifically highlights the four types of L-R parsers listed below: LR(0), SLR(1), CLR(1), and LALR(1). He verbally notes that Operator Precedence parsers are typically used for ambiguous grammars, whereas L-R parsers are designed for unambiguous grammars. This section establishes the taxonomy of parsing techniques before diving into the specific mechanics of Bottom-Up parsing. The on-screen text 'Knowledge Gate Educator Sanchit Jain Sir' is visible at the bottom left. Red arrows are drawn on the screen to indicate the hierarchy.

  2. 2:00 – 5:00 02:00-05:00

    The instructor presents a slide defining Bottom-Up parsing as the process of constructing a parse tree in a Bottom-Up manner, meaning starting from the children and proceeding towards the root. He provides a concrete example with the grammar rules S -> aABc, A -> b / bc, and B -> d, along with the input string w = abcdc. On the screen, he draws a parse tree diagram, starting with the terminal symbols a, b, c, d, c at the bottom. He circles the substrings 'bc' and 'd', identifying them as 'handles'. He explains that the process of finding a handle and replacing it with its Left-Hand Side (LHS) variable is called 'Handle Pruning'. He also mentions that Bottom-Up Parsing is alternatively known as 'Shift-Reduced Parsing'. The slide text explicitly states 'Handle: - Substring of the i/p string that matches with RHS of any production, is called as Handle.' The input string 'w = abcdc' is underlined in red.

  3. 5:00 – 8:17 05:00-08:17

    The lecture shifts to the performance characteristics of Bottom-Up Parsing. The instructor states that Bottom-Up parsing is faster and more efficient than Top-Down Parsing. He writes on the board to compare time complexities, noting 'Top -> O(n^4)' and 'Bottom -> O(n^3)'. He explains that Bottom-Up Parsing simulates the reverse of a Right Most Derivation. To further illustrate the concept, he introduces a new grammar: S -> AA and A -> aA / b. He then draws a table with three columns labeled 'Stack', 'i/p', and 'Action', preparing to demonstrate the step-by-step parsing process using this new example. The slide text mentions 'BUP can be constructed for both Ambiguous & Unambiguous grammar' and 'Handle pruning is the overhead for bottom-UP-parsing.'

The video provides a structured introduction to Bottom-Up Parsing, moving from a high-level classification of parsers to a detailed explanation of the parsing mechanism. It effectively uses visual aids like flowcharts and hand-drawn parse trees to clarify abstract concepts such as 'handles' and 'handle pruning'. By comparing time complexities and introducing the parsing table structure, the lecture bridges the gap between theoretical definitions and practical implementation, preparing students for more advanced topics like LR parsing tables.

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