partial implementation of day 3 part 1 in rust

rust/src/day3/mod.rs

@@ -0,0 +1,74 @@
+use std::fs;
+
+pub fn run_day3(){
+    let contents = fs::read_to_string("input.txt")
+        .expect("Could not load file");
+    let part_one_result = part_one(&contents);
+}
+
+struct SymbolPosition<'a> {
+    x: i32,
+    y: i32,
+    char_map: &'a Vec<Vec<char>>
+}
+
+impl SymbolPosition {
+    fn explore_neighbours()-> Vec<i32>{
+        let mut found_numbers: Vec<i32> = Vec::new();
+
+        let neighbours: [SymbolPosition; 8] = [
+            SymbolPosition{x: Self.x - 1, y: Self.y - 1, char_map: Self.char_map},
+            SymbolPosition{x: Self.x ,    y: Self.y - 1, char_map: Self.char_map},
+            SymbolPosition{x: Self.x + 1, y: Self.y - 1, char_map: Self.char_map},
+            SymbolPosition{x: Self.x - 1, y: Self.y ,    char_map: Self.char_map},
+            SymbolPosition{x: Self.x + 1, y: Self.y ,    char_map: Self.char_map},
+            SymbolPosition{x: Self.x - 1, y: Self.y + 1, char_map: Self.char_map},
+            SymbolPosition{x: Self.x ,    y: Self.y + 1, char_map: Self.char_map},
+            SymbolPosition{x: Self.x + 1, y: Self.y + 1, char_map: Self.char_map},
+        ];
+
+        for neighbour in neighbours{
+            if neighbour.is_digit(){
+                found_numbers.push(neighbour.find_full_number())
+            }
+        }
+        found_numbers
+    }
+
+    fn is_digit()->bool{
+        return regex::Regex::new(r"\d")
+            .unwrap()
+            .is_match(Self.char_map[Self.y][Self.x]);
+    }
+
+    fn find_full_number()->i32{
+        // Implement searching for a full number, mainly traverse the
+        // self.y position in the char_map forwards and backwards until
+        // we find the end of the vec, or a non digit character. Preserving
+        // order.
+        panic!()
+    }
+}
+
+fn part_one(contents: &String)-> i32{
+    let mut char_map: Vec<Vec<char>> = Vec::new();
+    let mut symbols: Vec<SymbolPosition> = Vec::new();
+
+    for line in contents.lines(){
+        let line_vec: Vec<char> = line.chars().collect();
+        char_map.push(line_vec);
+    }
+
+    for (y, line) in char_map.iter().enumerate(){
+        for (x, current_char) in line.iter().enumerate(){
+            let non_digit = regex::Regex::new(r"[^\w.]").unwrap();
+            if non_digit.is_match(&current_char.to_string()){
+                symbols.push(SymbolPosition{x: x as i32, y: y as i32 , char_map: &char_map})
+            }
+        }
+    }
+
+
+
+    0
+}

rust/src/main.rs

@@ -1,5 +1,7 @@
 mod day1;
 mod day2;
+mod day3;
+
 
 fn main() {
     day1::run_day1();