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.
1,204
questions
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A simple parser generator
I need to parse simple DSLs in a few projects. Since I don't know BNF or other grammars, I figured an alternative would be to use a simple parser generator.
I'm looking for improvements to the lexer/...
5
votes
2answers
108 views
C# Logical and Math expression parser
I needed a simple parser that could do both logical and math operations expressed in a string, as well as being able to use variables stored in json.
None of what I found online seemed to do all of ...
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6
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2answers
142 views
Separating data from string representation of objects, with added extras
Given a string representation of data, I want to extract the information into its corresponding object.
However,
If the string has "|" separators then these should be considered options and ...
3
votes
2answers
25 views
Handle missing children nodes when parsing XML into a dictionary
I work on a code-base that uses xml to set up problems and specify model parameters. I've created a script that I run in tandem with our code. This script will ...
11
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3answers
357 views
FASTA-to-tsv conversion script
I worked on a script that takes as input a multi-sequence .fasta file and outputs the number of each aminoacid/sequence in a .tsv...
4
votes
2answers
71 views
Counting Characters from an HTML File with Python
I just completed level 2 of The Python Challenge on pythonchallenge.com and I am in the process of learning python so please bear with me and any silly mistakes I may have made.
I am looking for some ...
5
votes
1answer
52 views
URL parser in C
Title should be self-explenatory. This is a simple URL parser I wrote in C. The function takes a URL from the user and produces a struct that contains the information that can be used to request the ...
7
votes
3answers
181 views
parse date and number from API results
I'm slurping up fields from an API that returns an array of fields. Each field in the array is a String that actually contains two separate fields (a number and a date). The number is enclosed in ...
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How can I simplify my nom parser?
I'd like a recommendation on how I can improve the function unquoted_string below - specifically is there a better way to combine the parsers I have to achieve the ...
10
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1answer
162 views
Python molar mass calculator
I created the following program which takes a molecular formula as an input, eg CH3COOH and returns the molar mass of the compound:
...
2
votes
2answers
94 views
Parse python code, for specific pep8 issues
I am aware, that libraries exist for parsing python code, however, for the sake of learning how they parse errors, I'm creating a script that checks a file for only 6 Pep8 errors just for reference.
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2
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1answer
49 views
Poor man's “about::tracing” for llbuild build time summary in JSON file
I used llbuild ninja build --profile PATH to create a JSON file of build summary in the following format:
...
3
votes
1answer
111 views
Parse selected records from empty-line separated file
This is my first post here and I hope I will get some recommendations to improve my code. I have a parser which processes the file with the following structure:
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8
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1answer
220 views
Making argument parsing more streamlined and readable than if-statements
I am working on an API wrapper for calls to a website. Each of several types of calls can take a large number of optional arguments, some of which contradict. In the interest of preventing the user ...
2
votes
0answers
9 views
Prototype of a scanner/tokenizer for Bitmap Distribution Format parser
Instead of the obvious decision, parsing using given std::io::Lines/std::io::Bytes or crates like nom, I decided to explore ...
1
vote
0answers
87 views
Code refactor - eliminate generic interface and object methods
I'm building a method that tries to detect whether given information about an object's property to retrieve, a constraint operator and some data to compare it against, whether the result is true or ...
7
votes
2answers
80 views
Simple python string to list parser
So I came across this question on SO and I felt like it would be a cool thing to try and write a parser for since I always wanted to try it. So I present to you:
My first time writing a parser.
It ...
7
votes
1answer
73 views
Parse data from Input file and print results
I have written a script which does parsing to the input file and take out some values from them with respect to the node and print the data accordingly.
Below is my script, and it works as expected:
<...
8
votes
2answers
116 views
Text Parsing in C on a microcontroller
Microcontroller receive data on uart and call parser_i2c function when user presses enter
e.g. parser_i2c(I2C scan)
I want to parse following input from user communicated through uart
I2C scan
I2C ...
10
votes
2answers
566 views
Simple parser using Flex and C++
This is an alternative parser based on the specifications from this question. Briefly stated, the input file is a text file which has at least 33 fields separated by semicolons.
If the fourth field ...
34
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6answers
5k views
Parser written in PHP is 5.6x faster than the same C++ program in a similar test (g++ 4.8.5)
I'm absolutely dumbfounded by this. I was trying to demonstrate to myself how much faster C++ is than even modern PHP. I ran a simple CSV parsing program in both that have the same output. The CSV ...
2
votes
0answers
24 views
Experimental parser based on a Tree of (String, Set a)
The parser function is immutable and is completely based on the forest of strings with associated properties (String,Set a).
Changing the forest changes the behavior of the parser.
The use of Data....
3
votes
1answer
75 views
Parser for AEC in C++
Many people tell me that C++ is a significantly better language for writing compilers than JavaScript is. So, I've decided to rewrite the compiler for AEC (the programming language I've made) from ...
3
votes
1answer
107 views
Parse HTML bookmarks file to JSON using python
I am currently working on a project for an online course, my goal is to create a bookmark manager web app. So I created this python script to parse a chrome/firefox HTML bookmarks file (Netscape-...
3
votes
1answer
44 views
Extracting average time series
I have this JSON code that I got from a get request with Azure API. Everything works how I want it but it doesn't look good. There must be an easier way to parse the data.
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4
votes
1answer
126 views
Is there a better way to parse this data file?
I have a text data file in SPWLA format; I cannot find a specification for it. It contains physical measurements and/or rock descriptions from wellbore core samples. It's fairly gross. The example ...
6
votes
1answer
75 views
Tool for converting OEIS sequences into Desmos lists
https://github.com/CascadeIllusion/DesmOEIS
Recently began work on a Python project called DesmOEIS to build up my portfolio. It's a simple console program that looks up integer sequences from the ...
2
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1answer
79 views
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 ...
3
votes
1answer
78 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
66 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
90 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
64 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 ...
5
votes
2answers
114 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
58 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
64 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
32 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
...
2
votes
1answer
89 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
33 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
votes
0answers
25 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
196 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
57 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
202 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
59 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
64 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
40 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
778 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
395 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 ...
