Bottom Up Parser Fundamentals Part-2
Duration: 5 min
This video lesson is available to enrolled students.
Inside: a video lesson and guided study material.
Module outline
- Discrete Mathematics: Permutation, Combination and Probability / क्रमचय, संचय एवं प्रायिकता, Set Theory, Relations, Functions, Propositional and Predicate Logic, Graph Theory, Group Theory
- Digital Logic: Digital Systems & Boolean Basics, Boolean Expression, Boolean Minimization, Logic Gates & Hardware, Combinational Circuit, Sequential Circuits, Number System, Number Representation, Floating Point Rep
- Computer Organization and Architecture: Basics of COA, Programming the Basic Computer, Cache Memory Organization, Input Output Organisation, Instr Formats & Modes, Register Transfer and Microoperations, Control Unit Design, Pipelining, Multiprocessors
- Programming: Language Design, C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling, OOPS with C++
- Data Structures: Introduction to DS, Array, Linked List, Stack, Queue, Tree, Graphs, Hashing
- Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos, Advanced Algorithms
- Theory of Computation: Grammar, Regular Language Properties, Moore & Mealy Machines, Turing Machines
- 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, Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Pushdown Automata & CFG, Complexity Theory
- Operating Systems: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management, Unix OS, Linux OS, Security
- Database Management Systems: 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, ORDBMS, NoSQL
- Computer Networks: 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
AI summary & chapters
AI Summary
An AI-generated summary of this video lecture.
The lecture focuses on the practical application of bottom-up parsing, specifically using an LR parser to analyze a string. The instructor begins by defining a context-free grammar with productions S -> AA and A -> aA / b, displayed in the top left corner. He then proceeds to parse the specific input string "abab" by manually constructing a parsing table. The process involves drawing a parse tree to visualize the derivation structure, setting up columns for Stack, input (i/p), and Action, and then executing a sequence of shift and reduce operations. The video concludes with a theoretical overview of the components that make up a bottom-up parser, reinforcing the practical demonstration.
Chapters
0:00 – 2:00 00:00-02:00
The instructor introduces the grammar rules S -> AA and A -> aA / b, visible in the top left corner. He draws a parse tree in red ink to represent the structure of the input string "abab", showing S branching into two A nodes. He then sets up a three-column table labeled Stack, i/p, and Action with blue headers. The process begins with the stack initialized to `$` and the input buffer containing `a b a b $`. The instructor performs the first shift operation, moving 'a' from the input to the stack, resulting in Stack `$a` and i/p `b a b $`. He follows this with a second shift, moving 'b' to the stack, resulting in Stack `$ab` and i/p `a b $`. The first reduction occurs where 'b' is reduced to 'A' using the rule A -> b, updating the stack to `$aA`. A subsequent reduction applies A -> aA, changing the stack to `$A`. The action column explicitly records "shift" and "Redn (A -> b)".
2:00 – 4:45 02:00-04:45
The parsing continues with the stack at `$A` and input `a b $`. The instructor shifts 'a' onto the stack, making it `$Aa`, and then shifts 'b', making it `$Aab`. A reduction follows where 'b' becomes 'A' (A -> b), resulting in Stack `$AaA`. Another reduction applies A -> aA, collapsing the stack to `$AA`. The final reduction uses the start symbol rule S -> AA, changing the stack to `$S`. The action column shows "acc" (accept) as the input buffer is empty and the stack contains the start symbol. The video ends with a slide titled "Model of an LR Parser," listing the three components: i/p buffer, Parse stack, and Parse table, alongside a diagram illustrating the driver program interacting with these components. The slide text "Bottom Up Parser consist of three components" is clearly visible.
The video effectively bridges theory and practice by walking through a complete parsing trace. It demonstrates how the abstract concepts of shift and reduce operations manifest in the parsing table, directly utilizing the grammar rules provided. The final slide reinforces the structural components (stack, buffer, table) that facilitate this process, providing a comprehensive overview of the LR parsing mechanism.