base program

src/converter.rs

@@ -0,0 +1,142 @@
+pub fn convert(from: &str, to: &str, val: &str) -> Result<String, String> {
+    let int_value = match from {
+        "b" => from_bin_to_int(val)?,
+        "o" => from_oct_to_int(val)?,
+        "d" => from_dec_to_int(val),
+        "h" => from_hex_to_int(val)?,
+        _ => return Err(format!("Not a valid system: {}", from))
+    };
+
+    match to {
+        "b" => Ok(from_int_to_bin(int_value)),
+        "o" => Ok(from_int_to_oct(int_value)),
+        "d" => Ok(from_int_to_dec(int_value)),
+        "h" => Ok(from_int_to_hex(int_value)),
+        _ =>Err(format!("Not a valid system: {}", from))
+    }
+}
+
+pub fn from_int_to_oct(mut val: i32) -> String {
+    let mut s = String::new();
+    if val == 0 {
+        s += "0";
+    }
+    while val > 0 {
+        let rest = val % 8;
+        s += &rest.to_string();
+        val = val / 8;
+    }
+
+    return s.chars().rev().collect();
+}
+
+pub fn from_int_to_hex(mut val: i32) -> String {
+    let mut s = String::new();
+    if val == 0 {
+        s += "0";
+    }
+    while val > 0 {
+        let rest = val % 16;
+        let to_string = rest.to_string();
+
+        s += match rest {
+            10 => "A",
+            11 => "B",
+            12 => "C",
+            13 => "D",
+            14 => "E",
+            15 => "F",
+            _ => &to_string
+        };
+        val = val / 16;
+    }
+
+    return s.chars().rev().collect();
+}
+
+pub fn from_int_to_bin(mut val: i32) -> String {
+    let mut s = String::new();
+    if val == 0 {
+        s += "0";
+    }
+    while val > 0 {
+        let rest = val % 2;
+        s += &rest.to_string();
+        val = val / 2;
+    }
+
+    return s.chars().rev().collect();
+}
+
+pub fn from_int_to_dec(val: i32) -> String {
+    val.to_string()
+}
+
+pub fn from_dec_to_int(val: &str) -> i32 {
+    val.parse().expect("Not a valid decimal number")
+}
+
+pub fn from_oct_to_int(val: &str) -> Result<i32, String> {
+    let mut dec = 0;
+
+    for (i, c) in val.chars().rev().enumerate() {
+        let exp = i32::pow(8, i as u32);
+
+        dec += exp * match c.to_ascii_lowercase() {
+            '0' => 0,
+            '1' => 1,
+            '2' => 2,
+            '3' => 3,
+            '4' => 4,
+            '5' => 5,
+            '6' => 6,
+            '7' => 7,
+            _ => return Err(format!("Not a valid octal number: {} at char {}: {}", val, i, c))
+        };
+    }
+    return Ok(dec);
+}
+
+pub fn from_hex_to_int(val: &str) -> Result<i32, String> {
+    let mut dec = 0;
+
+    for (i, c) in val.chars().rev().enumerate() {
+        let exp = i32::pow(16, i as u32);
+
+        dec += exp * match c.to_ascii_lowercase() {
+            '0' => 0,
+            '1' => 1,
+            '2' => 2,
+            '3' => 3,
+            '4' => 4,
+            '5' => 5,
+            '6' => 6,
+            '7' => 7,
+            '8' => 8,
+            '9' => 9,
+            'a' => 10,
+            'b' => 11,
+            'c' => 12,
+            'd' => 13,
+            'e' => 14,
+            'f' => 15,
+            _ => return Err(format!("Not a valid hex number: {} at char {}: {}", val, i, c))
+        };
+    }
+    return Ok(dec);
+}
+
+pub fn from_bin_to_int(val: &str) -> Result<i32, String> {
+    let mut dec = 0;
+
+    for (i, c) in val.chars().rev().enumerate() {
+        let exp = i32::pow(2, i as u32);
+        if c == '1' {
+            dec += exp;
+        } else if c == '0' {} else {
+            return Err(format!("Not a valid binary number: {} at char {}: {}", val, i, c));
+        }
+    }
+
+    return Ok(dec);
+}

src/main.rs

@@ -0,0 +1,54 @@
+mod converter;
+
+#[macro_use]
+extern crate lazy_static;
+extern crate regex;
+
+use std::io;
+use regex::Regex;
+use std::result::Result::Err;
+
+fn main() {
+    println!("Enter a conversion | help");
+
+
+    loop {
+        let mut input = String::new();
+
+        io::stdin()
+            .read_line(&mut input)
+            .expect("Failed to read line");
+
+        let trimmed = input.trim();
+
+        if trimmed == "help" {
+            println!("Enter a number and end it with a suffix [bodh] and then a space and the system you want it converted to.\n\
+                Example: '255d h'\n\
+                Will lead to: 'FF'");
+        } else if trimmed == "exit" || trimmed == "c" || trimmed == "x"{
+            break;
+        } else {
+            let splits = split(trimmed);
+            match splits {
+                Ok(a) => {
+                    match converter::convert(&a.1, &a.2, &a.0) {
+                        Ok(a) => println!("{}", a),
+                        Err(e) => println!("{}", e)
+                    }
+                }
+                Err(_) => println!("Invalid input")
+            }
+        }
+    }
+}
+
+fn split(s: &str) -> Result<(String, String, String), ()> {
+    lazy_static! {
+        static ref RE: Regex = Regex::new(r"^(\w+) ?(\w) (\w)$").unwrap();
+    }
+
+    for capture in RE.captures_iter(s) {
+        return Ok((capture[1].to_string(), capture[2].to_string(), capture[3].to_string()));
+    }
+    Err(())
+}