fix: #9 no error on trying to insert more than limit, plus some other

tests and minor fix

internals/repl/repl.go

@@ -37,6 +37,10 @@ func Run() {
 			fmt.Println("Syntax error, could not parse statement")
 		case PrepareUnrecognised:
 			fmt.Printf("Unrecognised keyword at the start of '%s'.\n", inputBuffer.Buffer)
+		case PrepareTooManyArgs:
+			fmt.Printf("Too many arguments in the insert statement '%v'\n", inputBuffer.Buffer)
+		case PrepareValueTooLong:
+			fmt.Printf("Values for either username or email are too long\n")
 		}
 
 		switch statement.ExecuteStatement(table) {

internals/vm/vm.go

@@ -4,6 +4,8 @@ import (
 	"encoding/binary"
 	"fmt"
 	"os"
+	"slices"
+	"strconv"
 	"strings"
 
 	. "godb/internals/buffer"
@@ -21,6 +23,8 @@ type PrepareResults int
 const (
 	PrepareSuccess PrepareResults = iota
 	PrepareUnrecognised
+	PrepareTooManyArgs
+	PrepareValueTooLong
 	PrepareSyntaxError
 )
 
@@ -151,19 +155,45 @@ func DoMetaCommands(inputBuffer *InputBuffer) MetaCommandResults {
 	return metacommand
 }
 
+func (statement *Statement) perpareInsert(inputBuffer *InputBuffer) PrepareResults {
+	inputs := strings.Split(inputBuffer.Buffer, " ")[1:]
+	if len(inputs) < 3 {
+		return PrepareSyntaxError
+	}
+	if len(inputs) > 3 {
+		return PrepareTooManyArgs
+	}
+	if slices.Contains(inputs, "null") || slices.Contains(inputs, "NULL") || slices.Contains(inputs, "Null") || slices.Contains(inputs, " ") {
+		return PrepareSyntaxError
+	}
+
+	tid, err := strconv.ParseUint(inputs[0], 10, 0)
+	if err != nil {
+		// fmt.Printf("supplied ID: %v isn't acceptable, please correct and retry\n", inputs[0])
+		return PrepareSyntaxError
+	}
+	id := uint(tid)
+	if len(inputs[1]) > usernameSize {
+		// fmt.Printf("%v is too long for username\n", inputs[1])
+		return PrepareValueTooLong
+	}
+	if len(inputs[2]) > emailSize {
+		// fmt.Printf("%v is too long for email\n", inputs[2])
+		return PrepareValueTooLong
+	}
+
+	statement.row.id = id
+	statement.row.username = inputs[1]
+	statement.row.email = inputs[2]
+
+	statement.stype = StatementInsert
+	return PrepareSuccess
+}
+
 func (statement *Statement) PrepareStatements(inputBuffer *InputBuffer) PrepareResults {
 	statement.stype = StatementUnrecognized
 	if strings.HasPrefix(inputBuffer.Buffer, "insert") {
-		argsAssigned, err := fmt.Sscanf(inputBuffer.Buffer, "insert %d %s %s", &statement.row.id, &statement.row.username, &statement.row.email)
-		if err != nil {
-			fmt.Println("error parsing insert statement")
-			fmt.Println(err.Error())
-		}
-		if err != nil || argsAssigned > 3 {
-			return PrepareSyntaxError
-		}
-		statement.stype = StatementInsert
-		return PrepareSuccess
+		return statement.perpareInsert(inputBuffer)
 	}
 	if inputBuffer.Buffer == "select" {
 		statement.stype = StatementSelect