111 lines
2 KiB
Go
111 lines
2 KiB
Go
package main
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import (
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"bufio"
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"fmt"
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"io"
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"os"
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"os/user"
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"github.com/d5/tengo/ast"
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"github.com/d5/tengo/compiler"
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"github.com/d5/tengo/objects"
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"github.com/d5/tengo/parser"
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"github.com/d5/tengo/scanner"
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"github.com/d5/tengo/vm"
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)
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const (
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Prompt = ">> "
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)
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func main() {
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currentUser, err := user.Current()
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if err != nil {
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panic(err)
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}
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fmt.Printf("Hello, %s! This is the Ghost programming language!\n", currentUser.Name)
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startRepl(os.Stdin, os.Stdout)
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}
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func startRepl(in io.Reader, out io.Writer) {
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stdin := bufio.NewScanner(in)
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fileSet := scanner.NewFileSet()
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globals := make([]*objects.Object, vm.GlobalsSize)
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symbolTable := compiler.NewSymbolTable()
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for {
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_, _ = fmt.Fprintf(out, Prompt)
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scanned := stdin.Scan()
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if !scanned {
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return
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}
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line := stdin.Text()
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file, err := parser.ParseFile(fileSet.AddFile("test", -1, len(line)), []byte(line), nil)
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if err != nil {
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_, _ = fmt.Fprintf(out, "error: %s\n", err.Error())
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continue
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}
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file = addPrints(file)
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c := compiler.NewCompiler(symbolTable, nil)
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if err := c.Compile(file); err != nil {
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_, _ = fmt.Fprintf(out, "Compilation error:\n %s\n", err.Error())
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continue
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}
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machine := vm.NewVM(c.Bytecode(), globals)
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if err != nil {
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_, _ = fmt.Fprintf(out, "VM error:\n %s\n", err.Error())
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continue
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}
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if err := machine.Run(); err != nil {
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_, _ = fmt.Fprintf(out, "Execution error:\n %s\n", err.Error())
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continue
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}
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}
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}
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func addPrints(file *ast.File) *ast.File {
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var stmts []ast.Stmt
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for _, s := range file.Stmts {
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switch s := s.(type) {
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case *ast.ExprStmt:
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stmts = append(stmts, &ast.ExprStmt{
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Expr: &ast.CallExpr{
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Func: &ast.Ident{
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Name: "print",
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},
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Args: []ast.Expr{s.Expr},
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},
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})
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case *ast.AssignStmt:
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stmts = append(stmts, s)
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stmts = append(stmts, &ast.ExprStmt{
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Expr: &ast.CallExpr{
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Func: &ast.Ident{
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Name: "print",
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},
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Args: s.Lhs,
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},
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})
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default:
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stmts = append(stmts, s)
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}
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}
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return &ast.File{
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InputFile: file.InputFile,
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Stmts: stmts,
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}
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}
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