Fix clippy warnings

src/compiler.rs

@@ -1,3 +1,4 @@
+use std::collections::hash_map::Entry;
 use std::collections::HashMap;
 use std::num::ParseIntError;
 
@@ -216,14 +217,17 @@ impl Scope {
         variable: String,
         vtype: VariableType,
     ) -> Result<(), CompilerError> {
-        if self.variables.contains_key(&variable) {
-            Err(CompilerError::VariableExists(pos, variable))
-        } else if let Some(inner) = &mut self.inner_scope {
-            inner.add_var(pos, variable, vtype)
+        let entry = self.variables.entry(variable.clone());
+        if let Entry::Vacant(e) = entry {
+            if let Some(inner) = &mut self.inner_scope {
+                inner.add_var(pos, variable, vtype)
+            } else {
+                e.insert((self.counter, vtype));
+                self.counter += 1;
+                Ok(())
+            }
         } else {
-            self.variables.insert(variable, (self.counter, vtype));
-            self.counter += 1;
-            Ok(())
+            Err(CompilerError::VariableExists(pos, variable))
         }
     }
 

src/errors.rs

@@ -89,7 +89,7 @@ impl Display for CompilerError {
             CompilerError::LetFailed(pos, error) => {
                 format!("Let statement failed at {}:\n  {}", pos, error)
             }
-            CompilerError::CanNotAssignVoidType => format!("Can not assign void type here"),
+            CompilerError::CanNotAssignVoidType => "Can not assign void type here".to_string(),
             CompilerError::FunctionNotFound(pos, name, params) => format!(
                 "Function with signature {}{} not found at {}",
                 name,

src/main.rs

@@ -1,4 +1,5 @@
 #![forbid(unsafe_code)]
+#![warn(clippy::all)]
 
 mod compiler;
 mod errors;

src/parser/mod.rs

@@ -122,14 +122,12 @@ impl Parser {
                     } else {
                         false
                     }
+                } else if ALLOWED_IDENT_BEGIN_CHARS.contains(lowercase) {
+                    ident = Some(peek.to_string());
+                    self.inconfidence += 1;
+                    true
                 } else {
-                    if ALLOWED_IDENT_BEGIN_CHARS.contains(lowercase) {
-                        ident = Some(peek.to_string());
-                        self.inconfidence += 1;
-                        true
-                    } else {
-                        false
-                    }
+                    false
                 }
             } else {
                 false
@@ -155,14 +153,12 @@ impl Parser {
                         self.inconfidence += 1;
                         true
                     }
+                } else if peek == '"' {
+                    content = Some(String::new());
+                    self.inconfidence += 1;
+                    true
                 } else {
-                    if peek == '"' {
-                        content = Some(String::new());
-                        self.inconfidence += 1;
-                        true
-                    } else {
-                        false
-                    }
+                    false
                 }
             } else {
                 false
@@ -273,7 +269,7 @@ impl<'a> Expect<'a> {
         }
     }
 
-    pub fn and<'b, T: Into<String>>(self, other: Expectable<T>) -> Expects<'a> {
+    pub fn and<T: Into<String>>(self, other: Expectable<T>) -> Expects<'a> {
         let texts = if let Some(text) = self.text {
             Some(vec![text])
         } else {
@@ -281,7 +277,7 @@ impl<'a> Expect<'a> {
         };
         Expects::and(
             Expects {
-                texts: texts,
+                texts,
                 parser: self.parser,
             },
             other,
@@ -295,7 +291,7 @@ pub struct Expects<'a> {
 }
 
 impl<'a> Expects<'a> {
-    pub fn and<'b, T: Into<String>>(mut self, expect: Expectable<T>) -> Expects<'a> {
+    pub fn and<T: Into<String>>(mut self, expect: Expectable<T>) -> Expects<'a> {
         let other = self.parser.expect(expect);
         if let Some(texts) = &mut self.texts {
             if let Some(text) = other.get_inconfident() {

src/parser/parsed_reid.rs

@@ -15,7 +15,7 @@ impl Statement {
     pub fn parse(parser: &mut Parser) -> Result<Statement, SyntaxError> {
         let pos = parser.pos();
 
-        if let Some(_) = parser.expect_static("let").get() {
+        if parser.expect_static("let").get().is_some() {
             let ident = parser
                 .expect_ident()
                 .get_or(SyntaxError::ExpectedIdent(pos))?;
@@ -57,7 +57,7 @@ impl Expression {
     pub fn parse(parser: &mut Parser) -> Result<Expression, SyntaxError> {
         let begin_pos = parser.pos();
 
-        if let Some(_) = parser.expect_static("{").get() {
+        if parser.expect_static("{").get().is_some() {
             let mut statement_list = Vec::new();
             while {
                 match Statement::parse(parser) {
@@ -68,7 +68,7 @@ impl Expression {
                     Err(_) => false,
                 }
             } {}
-            if let Some(_) = parser.expect_static("}").get() {
+            if parser.expect_static("}").get().is_some() {
                 Ok(Expression::BlockExpr(begin_pos, statement_list))
             } else {
                 Err(SyntaxError::ExpectedToken(parser.pos(), '}'))
@@ -81,11 +81,7 @@ impl Expression {
                 match Expression::parse(parser) {
                     Ok(exp) => {
                         arg_list.push(exp);
-                        if let Some(_) = parser.expect_static(",").get() {
-                            true
-                        } else {
-                            false
-                        }
+                        parser.expect_static(",").get().is_some()
                     }
                     Err(err) => {
                         if arg_list.is_empty() {

src/vm/mod.rs

@@ -43,7 +43,7 @@ impl VirtualMachine {
     pub fn run(&mut self) -> Result<(), RuntimePanic> {
         let mut error = None;
         while error.is_none() {
-            if let Some(command) = self.compiled.list.get(self.position).map(|v| v.clone()) {
+            if let Some(command) = self.compiled.list.get(self.position).cloned() {
                 self.position += 1;
                 if let Err(err) = self.execute(command.clone()) {
                     error = Some(err);
@@ -140,7 +140,7 @@ impl VirtualMachine {
             }
             Command::StringLit(string) => {
                 if self.stack.len() < usize::MAX {
-                    self.stack.push(Value::StringVal(string.clone()));
+                    self.stack.push(Value::StringVal(string));
                     //dbg!("String literal added to stack", string, &self.stack);
                     Ok(())
                 } else {