Merge pull request #2 from PlexSheep/devel

Recursive formulation of Expressions

Cargo.lock

@@ -2,12 +2,27 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "aho-corasick"
+version = "0.7.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cc936419f96fa211c1b9166887b38e5e40b19958e5b895be7c1f93adec7071ac"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "anyhow"
 version = "1.0.69"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "224afbd727c3d6e4b90103ece64b8d1b67fbb1973b1046c2281eed3f3803f800"
 
+[[package]]
+name = "autocfg"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@@ -124,6 +139,88 @@ version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f051f77a7c8e6957c0696eac88f26b0117e54f52d3fc682ab19397a8812846a4"
 
+[[package]]
+name = "memchr"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
+
+[[package]]
+name = "num"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "43db66d1170d347f9a065114077f7dccb00c1b9478c89384490a3425279a4606"
+dependencies = [
+ "num-bigint",
+ "num-complex",
+ "num-integer",
+ "num-iter",
+ "num-rational",
+ "num-traits",
+]
+
+[[package]]
+name = "num-bigint"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f93ab6289c7b344a8a9f60f88d80aa20032336fe78da341afc91c8a2341fc75f"
+dependencies = [
+ "autocfg",
+ "num-integer",
+ "num-traits",
+]
+
+[[package]]
+name = "num-complex"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "02e0d21255c828d6f128a1e41534206671e8c3ea0c62f32291e808dc82cff17d"
+dependencies = [
+ "num-traits",
+]
+
+[[package]]
+name = "num-integer"
+version = "0.1.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "225d3389fb3509a24c93f5c29eb6bde2586b98d9f016636dff58d7c6f7569cd9"
+dependencies = [
+ "autocfg",
+ "num-traits",
+]
+
+[[package]]
+name = "num-iter"
+version = "0.1.43"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7d03e6c028c5dc5cac6e2dec0efda81fc887605bb3d884578bb6d6bf7514e252"
+dependencies = [
+ "autocfg",
+ "num-integer",
+ "num-traits",
+]
+
+[[package]]
+name = "num-rational"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0638a1c9d0a3c0914158145bc76cff373a75a627e6ecbfb71cbe6f453a5a19b0"
+dependencies = [
+ "autocfg",
+ "num-bigint",
+ "num-integer",
+ "num-traits",
+]
+
+[[package]]
+name = "num-traits"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "578ede34cf02f8924ab9447f50c28075b4d3e5b269972345e7e0372b38c6cdcd"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "once_cell"
 version = "1.17.0"
@@ -178,12 +275,31 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "regex"
+version = "1.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "48aaa5748ba571fb95cd2c85c09f629215d3a6ece942baa100950af03a34f733"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "456c603be3e8d448b072f410900c09faf164fbce2d480456f50eea6e25f9c848"
+
 [[package]]
 name = "rust_command_line_calculator"
-version = "0.1.0"
+version = "0.1.1"
 dependencies = [
  "anyhow",
  "clap",
+ "num",
+ "regex",
 ]
 
 [[package]]

Cargo.toml

@@ -18,3 +18,5 @@ path = "src/main.rs"
 [dependencies]
 clap = { version = "4.0", features = ["derive"] }
 anyhow = "1.0"
+num = "0.4.0"
+regex = "1.7.1"

src/expression_parser.rs

@@ -1,2 +1,155 @@
+use std::fmt;
+use regex::Regex;
 
+// In an expression like `sqrt(25)` the Task would correspond to `sqrt`. This is the enum to 
+// configure possible Tasks.
+// None means, the Expression doesn't send it's Value to a Task Handler
+#[derive(Debug)]    // automatically generate Debug Formatter
+pub enum Task {
+    None,
+    Sqrt,
+    Power,
+    Log(u64),
+}
+
+// How to clone a Task, i was supprised I had to do it myself.
+impl Clone for Task {
+    fn clone(&self) -> Self {
+        // This can probably be done cleaner than with a verbose match. FIXME
+        match self {
+            Task::None => Task::None,
+            Task::Sqrt => Task::Sqrt,
+            Task::Power => Task::Power,
+            Task::Log(base) => Task::Log(*base), // TODO add base for log
+        }
+    }
+}
+
+impl Task {
+    pub fn new(task_text: &str) -> Task {
+        match task_text {
+            "none" => Task::None,
+            "sqrt" => Task::Sqrt,
+            "power"|"pow" => Task::Power,
+            "log"|"ln" => Task::Log(10),    // TODO add base
+            // what to do if a bad task was given:
+            &_ => {eprintln!("Bad Task: {}", task_text); std::process::exit(1); },
+        }
+    }
+}
+// An Expression is something that can be calculated. 20+5 is an expression. Expressions can 
+// contain other
+// Expressions and have tasks: 20+sqrt(20+5)
+// Expressions are marked down with braces and a task before those braces:
+// task(Expression)
+// once the Value of the Expression got calculated, the calculated value should be sent to the 
+// TaskHandler, if the Task of the Expression is not Task::None
+pub struct Expression {
+    text: String,
+    task: Task,
+    complex: bool,
+    inner_value: f64,
+    outer_value: f64,
+    children: Vec<Expression>,
+}
+
+// Debug Formatter for Expression
+impl fmt::Debug for Expression {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("Expression")
+            .field("text", &self.text)
+            .field("task", &self.task)
+            .field("is complex?", &self.complex)
+            .field("inner value", &self.inner_value)
+            .field("outer value", &self.outer_value)
+            .field("children", &self.children)
+            .finish()
+    }
+}
+
+// implement clone by ourselves, as it's not automatically done for us.
+impl Clone for Expression{
+    fn clone(&self) -> Self {
+        Expression { 
+            text: self.text.clone(), 
+            task: self.task.clone(),
+            complex: self.complex.clone(),  // TODO add support for complex numbers
+            inner_value: self.inner_value.clone(),
+            outer_value: self.outer_value.clone(),
+            children: self.children.clone(),
+        }
+    }
+}
+
+/*
+ * Main logic for the Expression struct
+ */
+impl Expression {
+    /*
+     * Main function for making text into Expression
+     * example: "12 + log_10(10 + 15) + 3"
+     * has a sub expression log_10(10 + 5), which has Task::Log with base 10
+     */
+    pub fn new(expression_text: String, task: Task) -> Expression {
+
+        // find children
+        // TODO add error for unused task parameters
+        let re_sub_expression = Regex::new(r"\w+\(.+?\)").unwrap();
+        if re_sub_expression.is_match(&expression_text) {
+            let mut children: Vec<Expression> = Vec::new();
+            for sub_expression_text in re_sub_expression.captures_iter(&expression_text) {
+                // if any task parameters are set ( syntax: task_para(expression) )
+                if sub_expression_text[0].contains('_') {
+                let task_and_expr: Vec<&str> = sub_expression_text[0].split(['_', '(']).collect();
+
+                let task_text = task_and_expr[0].clone().to_lowercase();
+                let task_param = task_and_expr[1].clone().to_string();
+                let task = match task_text.as_str() {
+                    "none" => Task::None,
+                    "sqrt" => Task::Sqrt,
+                    "power" => Task::Power,
+                    "log" => {let base: u64 = task_param.parse().unwrap(); Task::Log(base)},
+                    // what to do if a bad task was given:
+                    &_ => {eprintln!("Bad Task: {}", task_text); std::process::exit(1); },
+                };
+                let expression_inner = task_and_expr[2].clone().to_string();
+                children.push(Expression::new(expression_inner, task));
+                }
+                // if there are no parameters we need to do diffrent splitting and assume defaults
+                else {
+                let task_and_expr: Vec<&str> = sub_expression_text[0].split(['(']).collect();
+
+                let task_text = task_and_expr[0].clone().to_lowercase();
+                let task = match task_text.as_str() {
+                    "none" => Task::None,
+                    "sqrt" => Task::Sqrt,
+                    "power" => Task::Power,
+                    "log" => Task::Log(10),
+                    // what to do if a bad task was given:
+                    &_ => {eprintln!("Bad Task: {}", task_text); std::process::exit(1); },
+                };
+                let expression_inner = task_and_expr[1].clone().to_string();
+                children.push(Expression::new(expression_inner, task));
+                }
+            }
+            #[cfg(debug_assertions)]
+            dbg!(children);
+        }
+
+        let expression = Expression {
+            text: expression_text,
+            // TODO generate these from the text!
+            task: task,
+            complex: false,
+            inner_value: 0.0,
+            outer_value: 0.0,
+            children: Vec::new(),
+        };
+        expression
+    }
+
+    pub fn process(&self) {
+        println!("{}", self.text);
+    }
+}
 

src/main.rs

@@ -1,36 +1,51 @@
+use clap::{Parser, Subcommand};
+
 mod expression_parser;
 mod linear_algebra;
 
-use clap::{Parser, Subcommand};
+use expression_parser::Expression;
+use expression_parser::Task;
+
 
 #[derive(Parser)]
 #[command(author, version, about, long_about = None)]
 struct Arg {
+//    /// Optional subcommand
+//    #[command(subcommand)]
+//    command: Option<Commands>,
+
     /// Show verbose output
     #[arg(short, long)]
     verbose: bool,
 
-    /// Show debug output
-    #[arg(short, long, default_value_t = false)]
-    debug: bool,
-
-    #[command(subcommand)]
-    command: Option<Commands>,
-
     /// An expression that should be used to calculate something
-    expressionVector: Vec<String>,
+    expressions: Vec<String>,
 }
 
-#[derive(Subcommand)]
+//#[derive(Subcommand)]
-enum Commands {
+//enum Commands {
-    /// Assert if two expressions are equal to each other
+//    /// Assert if two expressions are equal to each other
-    Equal {
+//    Equal {
-        expressionVector: Vec<String>,
+//    }
-    }
+//}
-}
 
 fn main() {
     let args = Arg::parse();
-    dbg!(args.expressionVector);
+    let mut expression_vec: Vec<Expression> = Vec::new();
+
+    // join expression_texts to a big expression text, split at '%'. Remove unnessecary whitespace
+    // at the start ot end.
+    // TODO implement splitting of expressions, currently they are made only into a single big
+    // expression text
+    let mut expression_texts_concat: Vec<String> = Vec::new();
+    expression_texts_concat.push(args.expressions.join(" ").trim().to_string());
+
+    for expression_text in expression_texts_concat {
+        expression_vec.push(Expression::new(expression_text, Task::None));
     }
 
+    for expression in expression_vec {
+        expression.process();
+    }
+
+}