Merge pull request #5 from PlexSheep/devel

Basic calc functionality works

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rust_command_line_calculator"
-version = "0.2.0"
+version = "0.2.1"
 edition = "2021"
 authors = ["Christoph J. Scherr <software@cscherr.de>"]
 license = "GPL3"

src/expression_parser.rs

@@ -1,4 +1,4 @@
-use std::{fmt, error::Error, num::IntErrorKind};
+use std::fmt;
 use regex::Regex;
 
 pub mod shunting_yard;
@@ -284,7 +284,7 @@ impl Expression {
                     eprintln!(
                         "Could not calculate result of child expression '{}': {}", 
                         child.text,
-                        "error placeholder TODO"
+                        err
                         );
                     std::process::exit(2);
                 }

src/expression_parser/shunting_yard.rs

@@ -1,3 +1,4 @@
+use std::fmt;
 
 /*
  * Custom made implementation of the shunting yard algorithm.
@@ -17,6 +18,15 @@ enum Associativity {
     Left
 }
 
+impl fmt::Debug for Associativity {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match *self {
+            Associativity::Right => write!(f, "Right"),
+            Associativity::Left => write!(f, "Left"),
+        }
+    }
+}
+
 #[derive(PartialEq)]
 pub struct Operator {
     character: char,
@@ -24,6 +34,16 @@ pub struct Operator {
     associativity: Associativity
 }
 
+impl fmt::Debug for Operator {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("Operator")
+            .field("character", &self.character)
+            .field("precedence", &self.precedence)
+            .field("associativity", &self.associativity)
+            .finish()
+    }
+}
+
 impl Operator {
     pub fn is_operator(c: char) -> bool {
         for op in OPERATORS {
@@ -69,7 +89,7 @@ const DIVISION: Operator = Operator {
 };
 
 const EXPONENTIATION: Operator = Operator {
-    character: '*',
+    character: '^',
     precedence: 2,
     associativity: Associativity::Right
 };
@@ -89,7 +109,7 @@ pub fn form_reverse_polish_notation(regular_math: &str) -> Result<Vec<String>, S
         // read a token
         let token: char = input_queue.pop().unwrap();
         dbg!(&token);
-            
+
         // if the token is:
         // a number:
         if token.is_numeric() | (token == '.') {
@@ -122,25 +142,25 @@ pub fn form_reverse_polish_notation(regular_math: &str) -> Result<Vec<String>, S
                 Some(valid_op) => valid_op,
                 None => {panic!("Operator '{}' not found.", token);},
             };
-            
+
             // while there is an operator o2 at the top of the stack 
             if !operator_stack.is_empty() {
                 dbg!(&operator_stack);
                 let o2 = match Operator::get_operator(*(operator_stack.clone().last().clone().unwrap())) {
                     Some(valid_op) => valid_op,
-                None => {panic!("Operator '{}' not found.", token);},
+                    None => {panic!("Operator '{}' not found.", token);},
                 };
                 // and
                 // (o2 has greater precedence than o1 or (o1 and o2 have the same precedence and o1
                 // is left associative))
-                while ((operator_stack.last().is_some()) & ((o2.precedence > o1.precedence) | ((o1.precedence == o2.precedence) & (o1.associativity == Associativity::Left)))) {
+                while (operator_stack.last().is_some()) & ((o2.precedence > o1.precedence) | ((o1.precedence == o2.precedence) & (o1.associativity == Associativity::Left))) {
                     // pop o2 from the operator stack into the output queue.
                     // after this debug statement, the operator_stack is empty for no reason!!!!
                     // FIXME
                     let my_c = match operator_stack.pop() {
                         Some(c) => c,
                         None => {panic!("weirdly gone!")},
-                        };
+                    };
                     output_queue.push(vec![my_c]);
                 }
             }
@@ -149,10 +169,10 @@ pub fn form_reverse_polish_notation(regular_math: &str) -> Result<Vec<String>, S
         /*
         // Unnessecary, will be processed by the expression parser
         else if '(' == token {
-            println!("(");
+        println!("(");
         }
         else if ')' == token {
-            println!(")");
+        println!(")");
         }
         */
         else {
@@ -180,5 +200,91 @@ pub fn form_reverse_polish_notation(regular_math: &str) -> Result<Vec<String>, S
 
 // after we have the rpn, we may want to calculate the values with it.
 pub fn calc_reverse_polish_notation(rpn: Vec<String>) -> Result<f64, String> {
-    Ok(0.0)
+
+    //          # function to evaluate reverse polish notation
+    //      def evaluate(expression):
+    //        # splitting expression at whitespaces
+    //        expression = expression.split()
+    //        # stack
+    //        stack = []
+    //        # iterating expression
+    //        for ele in expression:
+    //          # ele is a number
+    //          if ele not in '/*+-':
+    //            stack.append(int(ele))
+    //          # ele is an operator
+    //          else:
+    //            # getting operands
+    //            right = stack.pop()
+    //            left = stack.pop()
+    //            # performing operation according to operator
+    //            if ele == '+':
+    //              stack.append(left + right)
+    //            elif ele == '-':
+    //              stack.append(left - right)
+    //            elif ele == '*':
+    //              stack.append(left * right)
+    //            elif ele == '/':
+    //              stack.append(int(left / right))
+    //        # return final answer.
+    //        return stack.pop()
+    let mut stack: Vec<f64> = Vec::new();
+
+    for group in rpn {
+        dbg!(&group);
+        // find out what the group is, an operator, a number, or a variable.
+        // TODO add variables
+        if !Operator::is_operator(group.chars().last().unwrap()) {
+            let possible_num = group.parse::<f64>();
+            match possible_num {
+                Ok(valid) => {stack.push(valid);},
+                Err(_whatever) => {
+                    eprint!("weird error happened, ending process..."); 
+                    std::process::exit(2);
+                },
+            }
+            dbg!(&stack);
+        }
+        else {
+            let op: Operator = Operator::get_operator(group.chars().last().unwrap()).unwrap();
+            dbg!(&op);
+            let right = stack.pop().unwrap();
+            let left = stack.pop().unwrap();
+
+            if op == ADDITION {
+                stack.push(left + right);
+            }
+
+            else if op == SUBTRACTION {
+                stack.push(left - right);
+            }
+
+            else if op == MULTIPLICATION {
+                stack.push(left * right);
+            }
+
+            else if op == DIVISION {
+                stack.push(left / right);
+            }
+
+            else if op == EXPONENTIATION {
+                stack.push(left.powf(right));
+            }
+
+            else {
+                todo!();
+            }
+        }
+    }
+
+
+    if stack.is_empty() {
+        return Err("result stack empty".to_string());
+    }
+    if stack.len() > 1 {
+        dbg!(stack);
+        return Err("result stack has too many results.".to_string());
+    }
+    return Ok(stack[0]);
+
 }

src/lib.rs

@@ -0,0 +1,7 @@
+// Make module public
+pub mod expression_parser; 
+
+// Make the function available at the root of the crate
+pub use expression_parser::*;
+
+

test.txt

@@ -1 +0,0 @@
-13 + 2525 + sqrt(15 + log_10(100)) + power_10(10)

tests/test.rs

@@ -0,0 +1,94 @@
+use rust_command_line_calculator as rclc;
+
+#[test]
+fn test_tests_are_loaded() {
+    assert_eq!("AA", "AA");
+}
+
+#[test]
+fn test_main_sum_simple() {
+    let my_expression: rclc::Expression = 
+        rclc::Expression::new(
+            String::from("40 + 33"),
+            String::from("40 + 33"),
+            rclc::Task::None,
+            0);
+    assert_eq!(my_expression.process().unwrap(), 73.0);
+}
+
+#[test]
+fn test_main_sum_chain() {
+    let my_expression: rclc::Expression = 
+        rclc::Expression::new(
+            String::from("20340 + 32424 + 24 + 23"),
+            String::from("20340 + 32424 + 24 + 23"),
+            rclc::Task::None,
+            0);
+    assert_eq!(my_expression.process().unwrap(), 20340.0 + 32424.0 + 24.0 + 23.0);
+}
+
+#[test]
+fn test_main_difference_simple() {
+    let my_expression: rclc::Expression = 
+        rclc::Expression::new(
+            String::from("33-13"),
+            String::from("33-13"),
+            rclc::Task::None,
+            0);
+    assert_eq!(my_expression.process().unwrap(), 33.0 - 13.0);
+}
+
+#[test]
+fn test_main_difference_chain() {
+    let my_expression: rclc::Expression = 
+        rclc::Expression::new(
+            String::from("353535 - 2405 - 33 - 13 - 4"),
+            String::from("353535 - 2405 - 33 - 13 - 4"),
+            rclc::Task::None,
+            0);
+    assert_eq!(my_expression.process().unwrap(), 353535.0 - 2405.0 - 33.0 - 13.0 - 4.0);
+}
+
+#[test]
+fn test_main_product_simple() {
+    let my_expression: rclc::Expression = 
+        rclc::Expression::new(
+            String::from("353* 13"),
+            String::from("353* 13"),
+            rclc::Task::None,
+            0);
+    assert_eq!(my_expression.process().unwrap(), 353.0 * 13.0);
+}
+
+#[test]
+fn test_main_procuct_chain() {
+    let my_expression: rclc::Expression = 
+        rclc::Expression::new(
+            String::from("353535 * 2405 * 33 * 13 * 4"),
+            String::from("353535 * 2405 * 33 * 13 * 4"),
+            rclc::Task::None,
+            0);
+    assert_eq!(my_expression.process().unwrap(), 353535.0 * 2405.0 * 33.0 * 13.0 * 4.0);
+}
+
+#[test]
+fn test_main_quotient_simple() {
+    let my_expression: rclc::Expression = 
+        rclc::Expression::new(
+            String::from("353 / 13"),
+            String::from("353 / 13"),
+            rclc::Task::None,
+            0);
+    assert_eq!(my_expression.process().unwrap(), 353.0 / 13.0);
+}
+
+#[test]
+fn test_main_quotient_chain() {
+    let my_expression: rclc::Expression = 
+        rclc::Expression::new(
+            String::from("353535 / 2405 / 33 / 13 / 4"),
+            String::from("353535 / 2405 / 33 / 13 / 4"),
+            rclc::Task::None,
+            0);
+    assert_eq!(my_expression.process().unwrap(), 353535.0 / 2405.0 / 33.0 / 13.0 / 4.0);
+}