added operatiom parsing

src/parser.rs

@@ -1,6 +1,6 @@
 use crate::lexer::{Token, TokenType};
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub enum ASTPart {
     String(AstString),
     Number(AstNumber),
@@ -10,35 +10,35 @@ pub enum ASTPart {
     Call(AstCall),
     NOOP
 }
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct AstString {
     pub value: String,
     pub pos: usize
 }
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct AstNumber {
     pub value: i64,
     pub pos: usize
 }
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct AstAssigment {
     pub variable: String,
     pub value: Box<ASTPart>,
     pub pos: usize
 }
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct AstOperation {
     pub operator: String,
     pub left: Box<ASTPart>,
     pub right: Box<ASTPart>,
     pub pos: usize
 }
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct AstVarRead {
     pub variable: String,
     pub pos: usize
 }
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct AstCall {
     pub function: Box<ASTPart>,
     pub args: Vec<ASTPart>,
@@ -57,7 +57,7 @@ fn is_end(input: &Token, end: &Vec<Token>) -> bool {
 fn read_call(variable: ASTPart, pos: &mut usize, input: &Vec<Token>) -> ASTPart {
     let mut args: Vec<ASTPart> = vec![];
     *pos += 1;
-    let start_pos = *pos;
+    let start_pos = input[*pos-1].pos;
     while pos < &mut input.len() {
         let token = &input[*pos];
         if token.typ == TokenType::SEPARATOR && token.value == "," {
@@ -78,11 +78,76 @@ fn read_call(variable: ASTPart, pos: &mut usize, input: &Vec<Token>) -> ASTPart
     return ASTPart::Call(AstCall { function: Box::new(variable), args: args, pos: start_pos });
 }
 
-fn shunt(input: Vec<ASTPart>) -> ASTPart {
-    for part in input {
-        
+fn operator_precedence(op: &str) -> i64 {
+    match op {
+        "|" | "&" => 1,
+        "+" | "-" => 2,
+        "*" | "/" | "%" => 3,
+        "^" => 4,
+        _ => 0
     }
-    return ASTPart::NOOP;
+}
+
+fn shunt(input: Vec<ASTPart>) -> ASTPart {
+    let mut output: Vec<ASTPart> = vec![];
+    let mut stack: Vec<ASTPart> = vec![];
+    for part in input {
+        match &part {
+            ASTPart::String(_) => {
+                output.push(part);
+            },
+            ASTPart::Number(_) => {
+                output.push(part);
+            },
+            ASTPart::Call(_) => {
+                stack.push(part);
+            },
+            ASTPart::VarRead(_) => {
+                output.push(part);
+            },
+            ASTPart::Operation(op) => {
+                while stack.len() > 0 {
+                    let top = &stack[stack.len()-1];
+                    match top {
+                        ASTPart::Operation(top_op) => {
+                            if operator_precedence(&top_op.operator) >= operator_precedence(&op.operator) {
+                                output.push(stack.pop().unwrap());
+                            } else {
+                                break;
+                            }
+                        },
+                        _ => break
+                    }
+                }
+                stack.push(part);
+            },
+            _ => {}
+        }
+    }
+    while stack.len() > 0 {
+        output.push(stack.pop().unwrap());
+    }
+    for i in 0..output.len() {
+        match &output[i] {
+            ASTPart::Operation(op) => {
+                if i < 2 {
+                    panic!("Unexpected operation at {}", op.pos);
+                }
+                let left = &output[i-2];
+                let right = &output[i-1];
+                output[i] = ASTPart::Operation(AstOperation {
+                    operator: op.operator.clone(),
+                    left: Box::new(left.clone()),
+                    right: Box::new(right.clone()),
+                    pos: op.pos
+                });
+                output.remove(i-2);
+                output.remove(i-2);
+            },
+            _ => {}
+        }
+    }
+    return output[0].clone();
 }
 fn read_exp(pos: &mut usize, input: &Vec<Token>, ends: &Vec<Token>, parse_ends: &Vec<Token>) -> ASTPart {
     let mut expressions: Vec<ASTPart> = vec![];
@@ -120,9 +185,8 @@ fn read_exp(pos: &mut usize, input: &Vec<Token>, ends: &Vec<Token>, parse_ends:
             panic!("Unexpected {:?}({}) at {}", token.typ, token.value, token.pos);
         }
     }
-    println!("{:?}", expressions);
     let shunted = shunt(expressions);
-    return ASTPart::NOOP;
+    return shunted;
 }
 
 fn next_operation(pos: &mut usize, input: &Vec<Token>, op_ends: &Vec<Token>, parse_ends: &Vec<Token>) -> ASTPart {

test.as

@@ -1,2 +1,3 @@
 gethelj a = 1
-gethelj b = a + 2
+gethelj b = a + (2+2)
+gethelj c = ugass(a,b)