URL Parser Project

Overview

This project implements a URL parser in Rust using the pest parser generator. The parser is designed to handle various components of a URL, including the scheme, host, port, path, query parameters, and fragment.

Installation

To use parser in your Rust project, add it as a dependency in your Cargo.toml file:

[dependencies]
parser_on_rust = "0.1.3"

Select the current version on crates.io: parser_on_rust

Usage

As lib

First, import the library in your Rust code:

use parser_on_rust::parse_url;

Then, you can convert Markdown text to HTML using the parse_markdown function:

fn main() {
    let url_string = "https://www.example.com/path?query=some";
    match parse_url(url_string) {
        Ok(parsed_url) => println!("Successfully parsed URL: {:?}", parsed_url),
        Err(err) => eprintln!("Error parsing URL: {}", err),
    }
}

Features

• Flexible URL Parsing: The parser supports a wide range of URL formats, allowing for flexibility in the structure of the provided URLs.

• Optional Components: Components like path, query parameters, and fragments are optional, providing versatility in handling URLs with or without these elements.

• Error Handling: Proper error handling is implemented using the Result type, ensuring graceful handling of parsing errors.

Project Structure

The project is structured as follows:

• src/lib.rs: Contains the implementation of the URL parser, including the grammar rules and parsing logic.

• src/main.rs: A simple executable that demonstrates the usage of the parser by parsing example URLs.

• tests/tests.rs: Unit tests for various scenarios, ensuring the correctness of the URL parsing logic.

• Cargo.toml: The project configuration file specifying dependencies and other metadata.

How to Run

To run the project, execute the following command:

cargo run

This will execute the main.rs file, demonstrating the parsing of example URLs.

Unit Tests

The project includes a comprehensive set of unit tests in the tests.rs file. To run the tests, use the following command:

cargo test

Dependencies

The project relies on the pest crate for parsing and pest_derive for procedural macro support. Ensure these dependencies are correctly specified in the Cargo.toml file.

[dependencies]
pest = "2.7.5"
pest_derive = "2.7.5"  

URL Grammar

url = { scheme ~ "://" ~ host ~ (":" ~ port)? ~ (path ~ ("/" ~ file)? ~ ("?" ~ query)? ~ ("#" ~ fragment)?)? }
scheme = { identifier_with_optional_dot }
host = { identifier_with_optional_dot }
port = { number }
path = { "/" ~ identifier ~ ("/" ~ identifier)* }
query = { identifier ~ ("=" ~ identifier)* }
fragment = { identifier }
file = { identifier ~ ("." ~ identifier)* }

identifier = { ASCII_ALPHANUMERIC+ }
identifier_with_optional_dot = { identifier ~ ( "." ~ ASCII_ALPHANUMERIC+)* }
number = { DIGIT+ }

WHITESPACE = _{ " " | "\n" | "\t" }
ASCII_ALPHANUMERIC = _{ ASCII_ALPHABET | DIGIT }
ASCII_ALPHABET = _{ 'a'..'z' | 'A'..'Z' }
DIGIT = _{ '0'..'9' }

Future Enhancements

• Additional URL Components: Extend the parser to support additional URL components if needed.

• User Input Handling: Implement a more robust user input handling mechanism, allowing users to input URLs interactively.

• Error Messages: Enhance error messages to provide more detailed information about parsing failures.

• Command-Line Interface (CLI): The project includes a simple command-line interface allowing users to input URLs for parsing.