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#[clap(long = "min-op", value_parser = clap::value_parser!(u32).range(1..))] + min_operands: u32, + #[clap(long = "max-op", value_parser = clap::value_parser!(u32).range(1..))] + max_operands: u32, + }, + Translate { + #[clap(short, long)] + input: PathBuf, + #[clap(short, long)] + output: PathBuf, + }, +} diff --git a/src/main.rs b/src/main.rs index e7a11a9..687108f 100644 --- a/src/main.rs +++ b/src/main.rs @@ -1,3 +1,124 @@ -fn main() { - println!("Hello, world!"); +use std::{ + collections::HashMap, + io::{Read, Write}, + sync::OnceLock, +}; + +use clap::{CommandFactory, Parser}; +use rand::Rng; + +mod cli; + +static OPERANDS: &str = "+-*/"; +static DIGITS: &str = "123456789"; + +static TRANSLATION_TABLE: OnceLock> = OnceLock::new(); + +fn valudate_args(args: cli::Args) -> Result { + match &args.command { + cli::Command::Generate { + min_operands, + max_operands, + .. + } => { + if min_operands > max_operands { + return Err(clap::Error::raw( + clap::error::ErrorKind::ValueValidation, + "min operands must not be greater than max operands", + )); + } + } + cli::Command::Translate { input, output } => { + if input == output { + return Err(clap::Error::raw( + clap::error::ErrorKind::ValueValidation, + "input and output must not be the same", + )); + } + } + } + + Ok(args) +} + +fn main() { + let args = match valudate_args(cli::Args::parse()) { + Ok(args) => args, + Err(err) => { + let mut command = cli::Args::command(); + err.format(&mut command).exit(); + } + }; + + match args.command { + cli::Command::Generate { + output, + lines, + min_operands, + max_operands, + } => { + let mut rand = rand::thread_rng(); + let mut output = std::fs::File::create(output).unwrap(); + for _ in 0..lines { + let operands = rand.gen_range(min_operands..max_operands + 1); + for _ in 0..operands { + let digit = rand.gen_range(0..DIGITS.len()); + let operand = rand.gen_range(0..OPERANDS.len()); + + let digit = DIGITS.get(digit..digit + 1).unwrap(); + let operand = OPERANDS.get(operand..operand + 1).unwrap(); + + output.write(digit.as_bytes()).unwrap(); + output.write(b" ").unwrap(); + output.write(operand.as_bytes()).unwrap(); + output.write(b" ").unwrap(); + } + + let digit = rand.gen_range(0..DIGITS.len()); + let digit = DIGITS.get(digit..digit + 1).unwrap(); + output.write(digit.as_bytes()).unwrap(); + + output.write(b"\n").unwrap(); + } + } + cli::Command::Translate { input, output } => { + let table = TRANSLATION_TABLE.get_or_init(|| { + HashMap::from([ + ("+", "add"), + ("-", "subtract"), + ("*", "multiply by"), + ("/", "divide by"), + ("0", "zero"), + ("1", "one"), + ("2", "two"), + ("3", "three"), + ("4", "four"), + ("5", "five"), + ("6", "six"), + ("7", "seven"), + ("8", "eight"), + ("9", "nine"), + ]) + }); + + let mut input = std::fs::File::open(input).unwrap(); + let mut output = std::fs::File::create(output).unwrap(); + + let mut buf = [0u8; 1]; + + loop { + match input.read(&mut buf) { + Ok(0) => break, + Ok(_) => { + let digit = std::str::from_utf8(&buf).unwrap(); + match table.get(digit) { + Some(translation) => output.write(translation.as_bytes()).unwrap(), + None => output.write(digit.as_bytes()).unwrap(), + }; + } + Err(err) => panic!("{}", err), + } + } + } + } }