Questions tagged [parsec]
Parsec is a parser library for the Haskell programming language.
20
questions
3
votes
2answers
503 views
CodeWars - Three-pass compiler for arithmetic expressions
I'm looking for feedback on my solution to the Tiny Three-Pass Compiler kata on CodeWars. The kata is to implement a compiler for an arithmetic language in three passes - parsing to an AST, constant ...
1
vote
1answer
73 views
Mail merge (Parsec string formatting) example
My intent is to perform "mail merge" where I can write strings like "hi <<name>>" and format them according to a ...
3
votes
1answer
292 views
Haskell Parsec library implementation in Scala
I've been developing a compiler for a programming language I'm working on in Scala, and after having used Haskell's Parsec a lot for this sort of thing in the past I decided to reimplement the library ...
1
vote
1answer
72 views
Inefficient Parsec parser to skip unreachable block
In a parser written with Parsec 3.1.11, I have a performance issue with parsing (or better, skipping) the unreachable branch of a if-then-else statement.
The syntax to be parsed is as follows:
...
4
votes
1answer
286 views
Haskell Parsec parser of Verilog-style number literals
I've set myself the task to write a function that parses Verilog-style number literals. In Verilog, numbers are written like this:
8'b10101100, ...
4
votes
1answer
110 views
Multiple base numbers parser
This code is a Parser that parses numbers according to R5RS.
#b1001 - binary
#o2127 - octal
#h02d - hexadecimal
#d1231 - decimal
3923 - decimal
It is working ...
3
votes
0answers
350 views
Haskell s-expression parser and quasiquoter
There are a number of questions on this site about s-expression parsing: e.g., Calculator parsing S-expressions and Code from "Write Yourself a Scheme in 48 Hours" tutorial.
However, these ...
5
votes
1answer
554 views
Python tokenizer in Haskell + Parsec
I wrote a tokenizer/lexer (difference?) for Python in Haskell: this is my code on GitHub.
I already tested it out with some of CPython's standard library scripts, and it doesn't fail. However, it ...
2
votes
1answer
78 views
Parsing a component of a regex followed by an optional quantifier character
I have a piece of parsec code that parses a unit optionally followed by ?, + or ...
3
votes
1answer
139 views
Parsing characters with parsec
I am trying to parse escape sequences as well as plain characters. Can this be made more succinct?
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3
votes
0answers
98 views
Generation and parsing of English numerals (cardinal and ordinal)
I need to use the English numerals (American) in Haskell, so I looked for a library that did it. I have not found one, therefore I developed the program that I am presenting here. There are actually ...
1
vote
1answer
60 views
Parsec for primes and fibs
I decided to spend some time working with parsec. I've written some code to check for primality and for whether something is a Fibonacci number. I'm mainly hoping for feedback on readability, but if ...
1
vote
1answer
237 views
Assorted Date Parser
I've written a date parser that parses different types of dates using Parsec.
Credit for the original problem goes to here.
The following formats are as such:
...
1
vote
0answers
442 views
Readability of a point-free applicative parser
I am writing an applicative parser, which you can think of as a minimal Parsec, just to educate myself. I got started with the excellent tutorial from this StackOverflow answer. Here is the relevant ...
5
votes
1answer
321 views
Using Parsec for simple arithmetic language
I've been reading Types and Programming Languages and I wanted to try to implement the first language in Haskell to understand it properly
I have barely written any Haskell before and not used Parsec ...
1
vote
1answer
445 views
block comment parser implementation for "monadic parser combinators"
I'm reading monadic parser combinators. On the page 23, they leave an exercise for defining a Gofer block comment parser, and I try to implement it in Haskell.
My code is here:
...
6
votes
1answer
902 views
Using Parsec for lexing&parsing
I'm creating list of Tokens from input [Char] stream using Parsec v3. The definition of Token...
15
votes
2answers
5k views
Parsing strings with escaped characters using Parsec
I have been working through the exercises in a Write Yourself a Scheme in 48 Hours/Parsing and hacked together something to get parseString to comprehend escaped characters. Also had some inspiration ...
6
votes
2answers
891 views
INI File Parser in Haskell
I'm learning Haskell at the moment, and have just written my first useful module - a parser fo INI files. I used Parsec. I'd like to know what can be improved here - or maybe I did some things ...
8
votes
1answer
834 views
First attempt at a SVG parser
I figured it's about time to jump into some Haskell, so here's a first attempt at an oddly specific SVG parser:
...
