feat: split into code for buffer and vm

internals/repl/repl.go

@@ -1,34 +1,44 @@
 package repl
 
 import (
-	"bufio"
 	"fmt"
-	"io"
-	"os"
 	"strings"
+
+	. "godb/internals/buffer"
+	. "godb/internals/vm"
 )
 
-type InputBuffer struct {
-	Buffer string
-	Reader *bufio.Reader
-}
-
-func NewInputBuffer() *InputBuffer {
-	return &InputBuffer{
-		Buffer: "",
-		Reader: bufio.NewReader(os.Stdin),
-	}
-}
-
 func PrintConsole() {
 	fmt.Print("godb > ")
 }
 
-func (inputBuffer *InputBuffer) ReadConsole() {
-	line, err := inputBuffer.Reader.ReadString('\n')
-	if err != nil && err != io.EOF {
-		fmt.Println("Error reading input", err)
-		os.Exit(1)
+func Run() {
+
+	inputBuffer := NewInputBuffer()
+	statement := NewStatement()
+	for {
+		PrintConsole()
+		inputBuffer.ReadConsole()
+		if len(inputBuffer.Buffer) > 0 && strings.HasPrefix(inputBuffer.Buffer, ".") {
+			switch DoMetaCommands(inputBuffer) {
+			case MetaCommandSuccess:
+				continue
+			case MetaCommandUnrecognised:
+				fmt.Printf("unrecognised command %v\n", inputBuffer.Buffer)
+				continue
+			}
+		}
+
+		switch statement.PrepareStatements(inputBuffer) {
+		case PrepareSuccess:
+			//todo
+		case PrepareUnrecognised:
+			fmt.Printf("Unrecognised keyword at the start of '%s'.\n", inputBuffer.Buffer)
+			continue
+		}
+
+		statement.ExecuteStatement()
+		fmt.Println("Executed")
+
 	}
-	inputBuffer.Buffer = strings.TrimSpace(line)
 }