The document discusses operator precedence parsers. It defines an operator grammar as one where no production right side is empty or has two adjacent nonterminals. It presents an example grammar for expressions and shows how to convert it to an operator grammar by substituting alternatives. It explains that operator precedence parsers use precedence functions to map symbols to integers to represent precedence relations numerically. The document provides an example precedence function graph and function table for a sample grammar and describes implementing an operator precedence parser to parse an expression.
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Conversion of in fix pre fix,infix by sarmad baloch
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In the Notes on Programming Language Syntax page, an example par.docxmecklenburgstrelitzh
In the
Notes on Programming Language Syntax
page, an example parser for a simple language is given, using C syntax. Write the parser using F#, but you may only use functional programming and immutable date. Create the list of tokens as a discriminated union, which (in the simplest case) looks like an enumeration.
type TERMINAL = IF|THEN|ELSE|BEGIN|END|PRINT|SEMICOLON|ID|EOF
With this type declared, you can use the terminals like you would use enumerated values in Java.
Use immutable data. The C-code example uses mutable data. Pass the program into the start symbol function. Pass the input yet to be processed to each non-terminal function.
The main function might look like this:
let test_program program =
let result = program |> S
match result with
| [] -> failwith "Early termination or missing EOF"
| x::xs -> if x = EOF then accept() else error()
You do not have to parse input strings. Assume that the parsing has been done. Pass a list of tokens that represent a program into the start symbol. Try these program examples:
[IF;ID;THEN;BEGIN;PRINT;ID;SEMICOLON;PRINT;ID;END;ELSE;PRINT;ID;EOF]
[IF;ID;THEN;IF;ID;THEN;PRINT;ID;ELSE;PRINT;ID;ELSE;BEGIN;PRINT;ID;END;EOF]
Causes error:
[IF;ID;THEN;BEGIN;PRINT;ID;SEMICOLON;PRINT;ID;SEMICOLON;END;ELSE;PRINT;ID;EOF]
Print an accept message when the input is valid and completely consumed. Generate appropriate error messages for incorrect symbols, not enough input, and too much input.
Once you have the parser recognizing input, generate a parse tree using a discriminated type.
Implement a parser using functional programming and immutable data for the unambiguous grammar for arithmetic expressions, from the
Notes on Programming Language Syntax.
E -> E + T | E - T | T
T -> T * F | T / F | F
F -> i | (E)
Use the suggestion in the notes to get around the fact that this grammar appears to need more than one lookahead token.
Once you have the parser recognizing input, generate a parse tree using a discriminated type.
Recall that an F# function that takes two arguments can be coded in either uncurried form (in which case it takes a pair as its input) or curried form (in which case it takes the first argument and returns a function that takes the second argument). In fact it is easy to convert from one form to the other in F#. To this end, define an F# function
curry f
that converts an uncurried function to a curried function, and an F# function
uncurry f
that does the opposite conversion. For example,
> (+);;
val it : (int -> int -> int) =
[email protected]
>
> let plus = uncurry (+);;
val plus : (int * int -> int)
> plus (2,3);;
val it : int = 5
> let cplus = curry plus;;
val cplus : (int -> int -> int)
> let plus3 = cplus 3;;
val plus3 : (int -> int)
> plus3 10;;
val it : int = 13
What are the types of
curry
and
uncurry
?
Given vectors
u = (u
1
, u
2
,..., u
n
)
and .
This slide is prepared By these following Students of Dept. of CSE JnU, Dhaka. Thanks To: Nusrat Jahan, Arifatun Nesa, Fatema Akter, Maleka Khatun, Tamanna Tabassum.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Democratizing Fuzzing at Scale by Abhishek Aryaabh.arya
Presented at NUS: Fuzzing and Software Security Summer School 2024
This keynote talks about the democratization of fuzzing at scale, highlighting the collaboration between open source communities, academia, and industry to advance the field of fuzzing. It delves into the history of fuzzing, the development of scalable fuzzing platforms, and the empowerment of community-driven research. The talk will further discuss recent advancements leveraging AI/ML and offer insights into the future evolution of the fuzzing landscape.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
Courier management system project report.pdfKamal Acharya
It is now-a-days very important for the people to send or receive articles like imported furniture, electronic items, gifts, business goods and the like. People depend vastly on different transport systems which mostly use the manual way of receiving and delivering the articles. There is no way to track the articles till they are received and there is no way to let the customer know what happened in transit, once he booked some articles. In such a situation, we need a system which completely computerizes the cargo activities including time to time tracking of the articles sent. This need is fulfilled by Courier Management System software which is online software for the cargo management people that enables them to receive the goods from a source and send them to a required destination and track their status from time to time.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
1. Compiler Construction Sunita M. Dol, CSE Dept
Walchand Institute of Technology, Solapur Page 1
Assignment No.9
AIM:
Implement Operator Precedence Parser
THEORY:
The grammars which have the property that no production right side is epsilon or
has two adjacent non-terminals is called an operator grammar.
The following grammar for expressions
E→EAE | (E) |-E | id
A → + | - | * | / | ↑
is not an operator grammar, because the right side EAE has two (in fact three)
consecutive nonterminal, However, if we substitute for A each of its alternatives,
we obtain the following operator grammar;
E→E+E | E-E | E*E | E/E | E↑E | (E) |-E | id
This parser relies on the following three precedence relations: ⋖, ≐, ⋗
a ⋖ b This means a “yields precedence to” b.
a ⋗ b This means a “takes precedence over” b.
a ≐ b This means a “has precedence as” b.
Figure 1.Operator precedence relation table for grammar E->E+E/E*E/id
2. Compiler Construction Sunita M. Dol, CSE Dept
Walchand Institute of Technology, Solapur Page 2
There is not given any relation between id and id as id will not be compared and
two variables cannot come side by side. There is also a disadvantage of this table
as if we have n operators than size of table will be n*n and complexity will be
0(n2
). In order to increase the size of table, use operator function table.
The operator precedence parsers usually do not store the precedence table with the
relations; rather they are implemented in a special way. Operator precedence
parsers use precedence functions that map terminal symbols to integers, and so
the precedence relations between the symbols are implemented by numerical
comparison. The parsing table can be encoded by two precedence
functions f and g that map terminal symbols to integers. We select f and g such
that:
1. f(a) < g(b) whenever a is precedence to b
2. f(a) = g(b) whenever a and b having precedence
3. f(a) > g(b) whenever a takes precedence over b
Example – Consider the following grammar:
E -> E + E/E * E/( E )/id
The directed graph representing the precedence function:
3. Compiler Construction Sunita M. Dol, CSE Dept
Walchand Institute of Technology, Solapur Page 3
Since there is not any cycle in the graph so we can make function table:
PROGRAM:
INPUT AND OUTPUT:
Operator precedence parser
==================
Enter the string(Use i for an identifier)i*(i+i)-i/(i^i)
$ i*(i+i)-i/(i^i)$
$i *(i+i)-i/(i^i)$
$E *(i+i)-i/(i^i)$
5. Compiler Construction Sunita M. Dol, CSE Dept
Walchand Institute of Technology, Solapur Page 5
CONCLUSION:
Operator Precedence Parser which have the property that no production right side
is epsilon or has two adjacent non-terminals is implemented.
REFERENCES:
Compilers - Principles, Techniques and Tools - A.V. Aho, R. Shethi and J. D.
Ullman (Pearson Education)
https://www.geeksforgeeks.org/theory-computation-operator-grammar-
precedence-parser/
