Questions tagged [parsing]
Parsing is the process of analysing a string of symbols, either in natural language or in computer languages, conforming to the rules of a formal grammar.
1,175
questions
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Library for parsing CSV data
Please review my C++ CSV parsing class.
I have some specific questions:
Should get_next_record be a static function?
CsvParser ...
2
votes
1answer
51 views
C# Reflection-based CSV Parser
I've been trying to make a C# version of my Java CSV Parser using C# specific idioms.
Here is the full code:
...
4
votes
1answer
58 views
A mathematical expression parser with custom data structures
I recently wrote a mathematical expression parser in C++. The software can read valid mathematical expressions and evaluate them. An example of an expression the code can parse is ...
3
votes
2answers
76 views
Java Reflection-based CSV Parser
I'm an experienced Java developer, however I don't have experience with reflection or Annotation classes. For fun, I tried to develop a CSV Reader class which can parse each row into a particular type....
2
votes
2answers
60 views
Finding pupils to tutor
I am a Math tutor and I found the site https://www.yksityisopetus.fi/ where one can search pupils. I made a Python parser to find pupils that want Math teaching with at least 25 €/hour. Are there any ...
4
votes
2answers
70 views
Convert Exponential (e-Notation) Numbers to Decimals
I have the following short function code that converts Exponential (e-Notation) Numbers to Decimals, allowing the output of large number of decimal places.
I needed to cover all the e-notation ...
2
votes
2answers
54 views
String data manipulated given CSV variables
The Requirements:
List the expensable items sorted by date and location given two variables: 'categories' and 'expenses'. The Categories variable provides the following information in order: Category ...
1
vote
1answer
62 views
C++ Code structure & Optimization: LR1Item
I've been working on an LR(1) parser, and I've just finished making the LR(1) item. I'm very rusty with C++, so any pointers (especially optimization and code structure) would be appreciated. Here are ...
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0answers
30 views
implementing parser - improvment
I have been trying to develop a program which implements a parser, i.e., syntactic analysis.
Here is what I have done so far:
parser.c
...
1
vote
1answer
71 views
Import huge XML data set into MongoDB while parsing data
I am currently working with the Stack Exchange Data Dump - to be more precise - with the dumped Posts.xml data set from Stack Overflow.
What am I trying to achieve?...
2
votes
1answer
32 views
Parsing input in form of 'CMD NUM NUM' (num could be special char '%')
In the main() function of the following code, I wrote a very naive command parsing. Is there any more efficient way?
This program is aim to deal with ADD, SUB, ...
4
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0answers
21 views
Listing my StackEchange communities user id
Extending this answer solution, I've wrote the following bash script to get the html of my StackExchange accounts page and parse it to a YAML file. The objective ...
3
votes
1answer
171 views
Java - parser for html-table
I wrote a program that saves the data from the first table of this wikipedia-article (in german) and then saves the column "Gesamt" (contains daily update of absolute numbers of Covid-19-infected ...
4
votes
1answer
69 views
How can this C++ json library be improved
I need a class to generate json content from data retrieved from a database. This gave me an excuse to play at creating a json library. This is my first attempt so it could probably be improved in ...
4
votes
1answer
51 views
A self contained parser generator implementation
This is a recreational project, I was trying to make a parser generator with a grammar inspired from: https://docs.python.org/3/reference/grammar.html
Unfortunately, understanding that specific ...
9
votes
3answers
185 views
Performance - Read large amount of XMLs and load into single csv
I am dealing with a large amount of XML files which I obtained from here https://clinicaltrials.gov/ct2/resources/download#DownloadAllData. The download yields around 300.000 XML files of similar ...
3
votes
1answer
56 views
Tar archive parser - custom implementation
I'm learning python and for educational purposes I implemented tar archive parser. I'm not beginner programmer. I would like to receive some feedback and tips about code, what can I improve, what ...
0
votes
1answer
52 views
bad GNU libc argp code [closed]
In helpcovid git commit e27dd3b123c18300665 we have a stupid bug related to Linux GNU glibc argp program argument parsing.
<...
2
votes
1answer
38 views
Reading bytes between two quotes from a stream and decoding it to its appropriate character set [closed]
This is a component for a lexer which operates on a byte input stream that handles reading and decoding the contents of a string contained within double-quotes. The validity of the encoding is handled ...
4
votes
2answers
760 views
Parsing a shop receipt
I've been working on a parser for shop receipts which extracts data about the payment. Here is the text that I'm parsing:
* Vic107Payment
Text: PINNEN
TicketData: POI: 12345678 ...
2
votes
1answer
224 views
Parsing a TLV string
This piece of code is supposed to walk through a TLV string and print out its contents. For this particular example, tag field length is 2, size field length is 3.
As a mostly C programmer, this is ...
5
votes
2answers
891 views
Python insert line in the middle of the file
I will be inserting a new text line in a setup.py file, this new line will contain text, and is part of the REQUIRED_PACKAGES. I ...
3
votes
2answers
64 views
Word bucketing in Python
First I'm not sure what this is called formally but whatever.
Basically I need to form "wildcard buckets". I think the best way to explain what I need to do is to take an example. For instance, say I ...
5
votes
2answers
226 views
Evaluating arithmetic expressions and plotting graphs
I just got started with Python. I created some code, and I want to know what more experienced devs think about it. What can I do better? What to avoid?
...
2
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0answers
59 views
Parsing a Graph To Convert It Into Adjacency Lists And CSR And Then Make Connection Queries Using Bidirectional BFS
I was assigned an university project where I had to parse directed graph files coming from SNAP and then convert them into CSR (Compressed Sparse Row) format. Then the client must have the ability to ...
4
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2answers
134 views
4
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1answer
104 views
Lexer written in Rust
So I ported a lexer I wrote in C++ over to rust, as I'm starting to learn rust. Since I'm very new though, I don't know any Idioms and good practices in rust. So if anyone could point out some (...
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1answer
75 views
Color highlighter / annotator in Haskell
I'm a Haskell beginner, and I wanted to make a color annotator or color highlighter, one which takes a text as standard input, and outputs that text, with its color words highlighted using the colors ...
2
votes
1answer
27 views
Parse Wavefront OBJ using ReadP
I've been reading Haskell tutorials and books for a while, but I never actually did serious stuff with it. This is my first attempt.
It parses an OBJ-file in text format. Later on I will add some ...
0
votes
1answer
62 views
JSON-Parser written in Go
Below is a JSON parser written in Go. It's just a task I set myself in order to learn Go, which is also the rationale for reinventing this wheel. At the moment, it's not 100% complete but it can ...
6
votes
3answers
269 views
Make my XML Parser in Java using WoodStox run faster and use less memory, or just generally better
I have an XML Parser in Java using WoodStox that I wrote. This parser is going to be parsing through extremely large files, could be 5+GB. The goal of the parser is to convert a nest XML file into a ...
3
votes
1answer
67 views
Extracting event strings and message objects from Twitch IRC messages
I am looking for a better way to minimize nested if statements in my MessageHandler.handleMessage method. I am looking to adhere to SRP and a function should do one ...
9
votes
3answers
283 views
Recursive Descent Parser Implementation for a Recursive Language
I'm writing toy parsers for toy languages to understand how parsers work.
Assuming a language as follows (in sketchy EBNF patois)
...
9
votes
1answer
124 views
Tokenize a string with escaping
I am learning C and therefore decided to build my own, little shell. Currently I am concerned with input parsing. I want to split a line of text into tokens with delimiters. But it should be possible ...
6
votes
2answers
451 views
C - manually parsing char* into integer
I'm trying to parse a char* into an int without using atoi(). I walk through the string, ...
27
votes
5answers
5k views
High performance txt file parsing
EDIT2: There is a summary below of the findings with new improved code and run time results achieved.
Multi threaded follow up has been posted here.
I find, in my daily programming, that text-file ...
0
votes
0answers
85 views
Simple React JavaScript Markdown Parser
I needed a simple Markdown parser for my purposes, such that I could turn a small subset of it (just bold, italics, code, links, and a custom poke you can click on) into React components (without ...
1
vote
1answer
40 views
Parsing HTML knock-off for answering queries for values
I wrote a code to parse an HTML knock-off from HackerRank, and I would like a review. Mostly I hope to get better at STL and code style. But any tips would be very welcome.
Sample input that I would ...
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vote
0answers
67 views
String parsing algorithm in Rust
I have written a recursive parsing algorithm for strings with nested brackets (I needed it to solve a molecules to atoms task). I would love to see how I could make ...
5
votes
2answers
147 views
Running out of fuel near Saturn
Optimizing/parsing files into semi-complex data-structures more efficiently
To preface, I'd like to say that this code is part of the Advent of Code 2019 solutions I have been working on. ...
5
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0answers
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3
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2answers
66 views
Validating CSV headers against an expected list
My application (legacy code) reads a CSV input file with an expected format with regards to Column names as follows:
1st column - Should say "Marker"
2nd column - Should say "Category"
3rd column ... ...
3
votes
1answer
73 views
Parsing opening hours, discarding insane ones (part of the OpenStreetMap editor)
This code is used to check opening hours data from OpenStreetMap can be handled by an editor app. In case where opening hours is not too complex data is also turned into an usable form.
It is a part ...
6
votes
2answers
194 views
Improving a JSON parser for C++
I wrote a JSON parser for C++. It is not particularly fast, efficient or elegant. I'd like to change that and primarily I'd like the code to be more elegant. How do I improve it and get rid of all the ...
7
votes
3answers
393 views
Parsing molecular formula
Is it possible to improve this code in terms of efficiency / line number ? (avoid nested code ...). It comes from a test I failed. I don't know how I could have done it better.
...
2
votes
1answer
80 views
Quadratic “Complete the Square” Solver in Python 3
I quickly wrote this program to transform quadratic expressions in general form into vertex form.
\$ax^2 + bx + c \;=\; a(x-h)^2 + k,\quad\text{where}\quad h = -\frac{b}{2a} \quad\text{and}\quad k = ...
2
votes
1answer
100 views
Ruby code to parse and analyze social media stats in json format
What do you think about this code I wrote.
It reads several json files ( I attached them as pastebins)
and the code outputs summary information calculated from the input.
...
7
votes
2answers
175 views
Simple IP address parser in C
I have written a C function to parse an IP address that should match the regular expression ^\d+.\d+.\d+.\d+ and nothing else.
Additionally all bytes are limited to ...
12
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4answers
1k views
3
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2answers
104 views
POST variable analysis contains JSON format string PHP
I am verifying certain codes that work well and I don't know what else to optimize in them or what other tests to do: in this case it is a php script that takes the data of the ...
