restructure

run.go

@@ -0,0 +1,43 @@
+package loxgo
+
+import (
+	"errors"
+	"os"
+
+	"git.red-panda.pet/pandaware/lox-go/ast"
+	"git.red-panda.pet/pandaware/lox-go/lexer"
+	"git.red-panda.pet/pandaware/lox-go/parser"
+	"git.red-panda.pet/pandaware/lox-go/reporter"
+)
+
+func RunFile(filename string) error {
+	bs, err := os.ReadFile(filename)
+	if err != nil {
+		return err
+	}
+
+	if err := Run(string(bs)); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func Run(source string) error {
+	s := lexer.New(source)
+	tokens, ok := s.ScanTokens()
+	if !ok {
+		return errors.New("lexer error")
+	}
+
+	p := parser.New(tokens)
+	expr, err := p.Parse()
+	if err != nil {
+		return errors.New("parser error")
+	}
+
+	printer := &ast.Printer{}
+	reporter.Debug(0, "astPrinter", "stdin", printer.Print(expr))
+
+	return nil
+}