Better runtime errors

Example.txt

@@ -1 +1 @@
-say my name (1gm+2gm);
+say my name (1gm+"Heisenberg");

Interpreter.py

@@ -1,28 +1,33 @@
 from Stmt import *
 from Expr import *
-from typing import Any
+from typing import Tuple,Any
 from TokenType import TokenType
 
 class JesseRuntimeError(RuntimeError):
-    def __init__(self, line: int, message: str) -> None:
+    def __init__(self, pos: Tuple[int], message: str) -> None:
         super().__init__(message)
-        self.line = line
+        self.pos = pos
 
 class Interpreter:
     '''
     The interpreter class for the Jesse programming language.
     It implements all the visitor methods for the AST nodes.
     '''
 
-    def __init__(self, jesse) -> None:
+    def __init__(self, jesse:object,source:str) -> None:
         self.jesse = jesse
+        self.source = source
+        self.lines = source.splitlines()
+
 
     def interpret(self, statements: List[Stmt]) -> None:
         try:
             for statement in statements:
                 self.execute(statement)
         except JesseRuntimeError as error:
-            self.jesse.runtime_error(error)
+            pos = error.pos
+            code = self.lines[pos[0] - 1]
+            self.jesse.runtime_error(code,pos,error)
 
     def visit_literal_expr(self, expr: Literal) -> Any:
         return expr.value
@@ -42,12 +47,12 @@ def visit_unary_expr(self, expr: Unary) -> Any:
     def check_number_operand(self, operator: Token, operand: Any) -> None:
         if isinstance(operand, float):
             return
-        raise JesseRuntimeError(operator.pos[0], "Operand must be a number.")
+        raise JesseRuntimeError(operator.pos, "operands must be a numbers, its basic math yo")
 
     def check_number_operands(self, operator: Token, left: Any, right: Any) -> None:
         if isinstance(left, float) and isinstance(right, float):
             return
-        raise JesseRuntimeError(operator.pos[0], "Operands must be numbers.")
+        raise JesseRuntimeError(operator.pos, "operands must be numbers, its basic math yo")
 
     def is_truthy(self, obj: Any) -> bool:
         if obj is None:
@@ -111,7 +116,7 @@ def visit_binary_expr(self, expr: Binary) -> Any:
                 return left + right
             if isinstance(left, str) and isinstance(right, str):
                 return left + right
-            raise JesseRuntimeError(expr.operator.pos[0], "Operands must be two numbers or two strings.")
+            raise JesseRuntimeError(expr.operator.pos, "operands must be two numbers or two strings yo")
         elif expr.operator.token_type == TokenType.GREATER:
             self.check_number_operands(expr.operator, left, right)
             return left > right

Jesse.py

@@ -23,7 +23,7 @@ def run(self, source: str) -> None:
             return
         parser = Parser(self,source,tokens)
         statements = parser.parse()
-        interpreter = Interpreter(self)
+        interpreter = Interpreter(self,source)
         interpreter.interpret(statements)
 
     def run_file(self, path: str) -> None:
@@ -49,8 +49,10 @@ def run_prompt(self) -> None:
     def error(self, code:str, pos: Tuple[int,int], message: str) -> None:
         self.report_error(code,pos, message)
 
-    def runtime_error(self, error: RuntimeError) -> None:
-        print(f'[Runtime Error] {error}')
+    def runtime_error(self, code:str, pos: Tuple[int,int], error: RuntimeError) -> None:
+        print(code)
+        print(" " * pos[1] + '^' + '-'*(len(code) - pos[1] - 1))
+        print(f'[Runtime Error {pos[0]}] mr white {error}')
         self.had_runtime_error = True
 
     def report_error(self, code:str, pos: Tuple[int,int], message: str) -> None:

Scanner.py

@@ -130,13 +130,12 @@ def scan_tokens(self) -> List[Token]:
                 did_match = True
                 continue
             # Match meth (numbers)
-            match = re.match(r'\d+(.\d+)?', self.source)
+            match = re.match(r'\d+(\.\d+)?', self.source)
             if match:
                 # Try to match gm after the number
                 # Otherwise raise an error
-                match_unit = re.match(r'gm', self.source[match.end():])
-                if match_unit:
-                    final_match = match.group()+match_unit.group()
+                if self.source[match.end():match.end()+2] == 'gm':
+                    final_match = match.group()+"gm"
                     pos = (self.line, self.column)
                     self.column += match.end() + 2
                     self.add_token(TokenType.METH, final_match, float(match.group()), pos)