feat(formatter): add format spec to formatter

src/formatter.py

@@ -5,6 +5,7 @@ from src.ast.expr import Expr, VariableExpr, LiteralExpr, GroupingExpr, UnaryExp
     CallExpr, SetExpr, GetExpr, ThisExpr, SuperExpr, FStringExpr, FStringEmbedExpr
 from src.ast.stmt import Stmt, LetStmt, IfStmt, ExpressionStmt, BlockStmt, WhileStmt, ForStmt, FunctionStmt, \
     ReturnStmt, BreakStmt, ContinueStmt, ClassStmt
+from src.core.format_spec.spec import FormatSpec
 
 
 class ClassType(Enum):
@@ -88,7 +89,11 @@ class Formatter(Expr.Visitor[str], Stmt.Visitor[str]):
         return res
 
     def visit_fstring_embed_expr(self, expr: FStringEmbedExpr) -> str:
-        return "{" + self.format(expr.expression) + "}"
+        res: str = "{" + self.format(expr.expression)
+        if expr.spec is not None:
+            res += ":" + self.format_format_spec(expr.spec)
+        res += "}"
+        return res
 
     def visit_variable_expr(self, expr: VariableExpr) -> str:
         return expr.name.lexeme
@@ -185,3 +190,22 @@ class Formatter(Expr.Visitor[str], Stmt.Visitor[str]):
 
     def visit_continue_stmt(self, stmt: ContinueStmt) -> str:
         return self.indented(f"{stmt.keyword.lexeme}\n")
+
+    def format_format_spec(self, spec: FormatSpec) -> str:
+        print(spec)
+        res: str = ""
+        if spec.options.sign is not None:
+            res += spec.options.sign.lexeme
+        if spec.number.integral.width is not None:
+            res += str(spec.number.integral.width)
+        if spec.number.integral.grouping is not None:
+            res += spec.number.integral.grouping.lexeme
+        if spec.number.decimal.precision is not None or spec.number.decimal.grouping is not None:
+            res += "."
+            if spec.number.decimal.precision is not None:
+                res += str(spec.number.decimal.precision)
+            if spec.number.decimal.grouping is not None:
+                res += spec.number.decimal.grouping.lexeme
+        if spec.type is not None:
+            res += spec.type.lexeme
+        return res