From 327917e29a2003200550ff6795c3a3d74916753d Mon Sep 17 00:00:00 2001
From: Alexandre Stein <stein_alexandre@pm.me>
Date: Sun, 13 Nov 2022 17:51:35 +0100
Subject: [PATCH] Brackets are fuly operational

---
 rust-calc/src/main.rs | 83 ++++++++++++++++++++++++++++++++++++-------
 1 file changed, 70 insertions(+), 13 deletions(-)

diff --git a/rust-calc/src/main.rs b/rust-calc/src/main.rs
index fa31432..1549ee2 100644
--- a/rust-calc/src/main.rs
+++ b/rust-calc/src/main.rs
@@ -3,7 +3,7 @@ use std::{
     process,
 };
 
-#[derive(Debug)]
+#[derive(Clone, Debug)]
 enum Symbol {
     Minus,
     Plus,
@@ -19,9 +19,6 @@ impl Symbol {
             Symbol::Multiply => true,
             Symbol::Divide => true,
 
-            Symbol::OpenBracket => true,
-            Symbol::CloseBracket => true,
-
             _ => false,
         }
     }
@@ -30,6 +27,20 @@ impl Symbol {
             Symbol::OpenBracket => true,
             Symbol::CloseBracket => true,
 
+            _ => false,
+        }
+    }
+    fn open_bracket(&self) -> bool {
+        match self {
+            Symbol::OpenBracket => true,
+
+            _ => false,
+        }
+    }
+    fn close_bracket(&self) -> bool {
+        match self {
+            Symbol::CloseBracket => true,
+
             _ => false,
         }
     }
@@ -46,12 +57,14 @@ impl TmpNum {
         self.s.push(c);
     }
     fn get(&mut self) -> f64 {
-        println!("{}", self.s);
         let n = self.s.parse::<f64>().ok().expect("number is malformed");
         self.s = String::new();
 
         n
     }
+    fn len(&self) -> usize {
+        self.s.len()
+    }
 }
 
 fn parse(pattern: String) -> (Vec<Symbol>, Vec<f64>) {
@@ -60,7 +73,9 @@ fn parse(pattern: String) -> (Vec<Symbol>, Vec<f64>) {
 
     let mut number = TmpNum::new();
 
-    for c in pattern.chars() {
+    let mut i = 0;
+    while i < pattern.len() {
+        let c = pattern.chars().nth(i).expect("some char");
         let s: Option<Symbol> = match c {
             '-' => Some(Symbol::Minus),
             '+' => Some(Symbol::Plus),
@@ -75,25 +90,67 @@ fn parse(pattern: String) -> (Vec<Symbol>, Vec<f64>) {
 
         match s {
             Some(s) => {
-                if number.s.len() == 0 {
-                    number.push(c);
+                if s.bracket() {
+                    let mut nb_bracket = 1;
+                    let mut i2 = i + 1;
+                    while i2 < pattern.len() {
+                        let c2 = pattern.chars().nth(i2).expect("some char");
+                        let s2: Option<Symbol> = match c2 {
+                            '(' => Some(Symbol::OpenBracket),
+                            ')' => Some(Symbol::CloseBracket),
+
+                            _ => None,
+                        };
+                        match s2 {
+                            Some(s2) => {
+                                if s2.bracket() {
+                                    if s2.open_bracket() {
+                                        nb_bracket += 1;
+                                    } else if s2.close_bracket() {
+                                        nb_bracket -= 1;
+                                        if nb_bracket == 0 {
+                                            let new_pattern = pattern
+                                                .get(i..i2)
+                                                .expect("expect the sub string")
+                                                .to_string();
+                                            let (tmp_symbols, tmp_numbers) = parse(new_pattern);
+                                            let tmp_result =
+                                                calculation(&tmp_symbols, &tmp_numbers);
+                                            numbers.push(tmp_result);
+                                            i = i2;
+                                        }
+                                    }
+                                }
+                            }
+                            None => {}
+                        }
+                        i2 += 1;
+                    }
                 } else {
-                    symbols.push(s);
-                    numbers.push(number.get());
+                    if number.s.len() == 0 {
+                        number.push(c);
+                    } else {
+                        symbols.push(s);
+                        numbers.push(number.get());
+                    }
                 }
             }
             None => {
                 number.push(c);
             }
         }
+
+        i += 1;
     }
 
-    numbers.push(number.get());
+    if number.len() != 0 {
+        numbers.push(number.get());
+    }
 
     (symbols, numbers)
 }
 
-fn calcul(symbols: Vec<Symbol>, numbers: Vec<f64>) -> f64 {
+fn calculation(symbols: &Vec<Symbol>, numbers: &Vec<f64>) -> f64 {
     let mut counter = 0;
     let mut n1 = *numbers.get(0).expect("expect at least the first value");
     while counter < symbols.len() {
@@ -187,6 +244,6 @@ fn main() {
         process::exit(2);
     }
 
-    let res = calcul(symbols, numbers);
+    let res = calculation(&symbols, &numbers);
     println!("{res}");
 }