examples/hello_world.rs

@@ -7,6 +7,10 @@ fn main() {
         )
     );
     if eval.is_err() {
-        eprintln!("Program failed: \n{}", eval.unwrap_err());
+        let err = eval.unwrap_err();
+        if err == "Stdin closed" {
+            return
+        }
+        eprintln!("Program failed: {}", err);
     }
 }

src/lib.rs

@@ -1,68 +1,6 @@
 #![forbid(unsafe_code)]
 
-use std::{io::{stdout, Write, Read, stdin}, fmt::format};
-
-/**
- * Check code for syntax errors
- */
-pub fn lint_code(code: &&str) -> Result<(), Vec<String>> {
-
-    let mut loop_stack: Vec<usize> = vec![];
-    let mut pos = 0 as usize;
-    let mut pointer = 0;
-
-    let chars = code.chars().collect::<Vec<char>>();
-    let size = code.len();
-
-    let mut errors = vec![];
-
-    loop {
-        if pos == size {
-            break
-        }
-
-        let char = chars[pos];
-        pos += 1;
-
-        if char == '<' {
-            if pointer == 0 {
-                errors.push(format!("ERR: Reducing pointer to less than 0 is not allowed ({})", pos));
-                continue
-            }
-            pointer -= 1;
-        }
-        if char == '>' {
-            if pointer == 29999 {
-                errors.push(format!("ERR: Increasing pointer to more than 29999 is not allowed ({})", pos));
-                continue
-            }
-            pointer += 1;
-        }
-        if char == '[' {
-            loop_stack.push(pos);
-            continue
-        }
-        if char == ']' {
-            if loop_stack.len() == 0 {
-                errors.push(format!("ERR: Unmatched ']' ({})", pos));
-                continue
-            }
-            loop_stack.pop();
-        }
-    }
-
-    if loop_stack.len() != 0 {
-        for lup in loop_stack.iter() {
-            errors.push(format!("Unmatched '[' ({})", *lup));
-        }
-    }
-
-    if errors.len() != 0 {
-        return Err(errors)
-    }
-
-    Ok(())
-}
+use std::io::{stdout, Write, Read, stdin};
 
 pub fn eval_mem(bf_str: &&str, mem: &mut [u8], pointer: &mut usize) -> Result<(), String> {
 
@@ -119,7 +57,7 @@ pub fn eval_mem(bf_str: &&str, mem: &mut [u8], pointer: &mut usize) -> Result<()
         if char == ',' {
             let byte = stdin().bytes().next();
             if byte.is_none() {
-                continue
+                return Err("Stdin closed".into());
             }
             let byte = byte.unwrap();
             if byte.is_err() {
@@ -156,21 +94,6 @@ pub fn eval_mem(bf_str: &&str, mem: &mut [u8], pointer: &mut usize) -> Result<()
 }
 
 pub fn eval(bf_str: &&str) -> Result<[u8; 30000], String> {
-
-    // first check the code
-
-    let lint = lint_code(bf_str);
-    if lint.is_err() {
-        return Err(
-            format!(
-                "Code linting failed: \n\n{}",
-                lint.unwrap_err().join("\n")
-            )
-        )
-    }
-
-    // then actually run it
-
     let mut memory: [u8; 30000] = core::array::from_fn(|_| 0);
     let mut pointer = 0 as usize;