Haskell中使用attoparsec重载字符串的文本解析问题求助

Hey there! It's awesome to see you diving into Haskell parsers and text analysis—great choice picking a Gutenberg project book as your test case. Let's break down what you've got so far and think about next steps for counting words, sentences, and paragraphs.

Your Current Code (Formatted) #

You started off with some solid imports and language extensions—here's how that looks properly formatted:

{-# LANGUAGE OverloadedStrings #-} 
import Control.Exception (catch, SomeException) 
import System.Environment (getArgs) 
import Data.Attoparsec.Text 
import Data...

Looks like your code got cut off mid-import, but you're already on the right track using Attoparsec, which is perfect for efficient text parsing in Haskell.

Tips for Your Text Analysis Goals #

Since you're aiming to count words, sentences, and paragraphs, here are some practical pointers to build out your parser:

• Paragraphs: Typically separated by one or more blank lines. You can define a parser that skips leading whitespace until it finds non-blank text, then parses all content until the next sequence of blank lines.
• Sentences: Usually end with ., ?, or !, followed by whitespace or the end of a paragraph. Watch out for edge cases like abbreviations (e.g., "Mr. Smith")—you might need to add logic to avoid splitting sentences prematurely.
• Words: Can be parsed as sequences of letters, possibly including apostrophes (for contractions like "don't"). Be sure to skip any punctuation that isn't part of the word itself.

Example Snippet to Expand Your Code #

Here's a quick starting point for sentence parsing (feel free to tweak it for your specific needs):

-- Basic sentence parser (note: doesn't handle abbreviations yet)
sentence :: Parser Text
sentence = takeTill (\c -> c `elem` ".?!") >> take 1 >> skipWhile isSpace

-- Parse multiple consecutive sentences
sentences :: Parser [Text]
sentences = many' sentence

Don't forget to wrap up your file handling logic—your imports for Control.Exception and System.Environment suggest you're planning to accept a file path via command-line args, which is a smart approach. Just make sure to catch IO exceptions when reading the file, then feed the text into your Attoparsec parser using parseOnly or parse.

Content of this question originates from Stack Exchange, asked by user centrinok