Put Error in its own module

error/error.go

@@ -1,7 +1,8 @@
-package file
+package error
 
 import "os"
 import "fmt"
+import "git.tebibyte.media/sashakoshka/arf/file"
 
 type ErrorKind int
 
@@ -11,14 +12,14 @@ const (
 )
 
 type Error struct {
-	Location
+	file.Location 
 	message string
 	kind    ErrorKind
 }
 
 // NewError creates a new error at the specified location.
 func NewError (
-	location Location,
+	location file.Location,
 	message string,
 	kind ErrorKind,
 ) (
@@ -41,24 +42,23 @@ func (err Error) Error () (formattedMessage string) {
 	}
 
 	// print information about the location of the mistake
-	if err.width > 0 {
+	if err.Width() > 0 {
 		formattedMessage += fmt.Sprint (
-			" \033[34m", err.Location.row + 1,
-			":", err.Location.column + 1)
+			" \033[34m", err.Row() + 1,
+			":", err.Column() + 1)
 	}
 	formattedMessage +=
 		" \033[90min\033[0m " +
-		err.Location.file.path + "\n"
+		err.File().Path() + "\n"
 	
-	if err.width > 0 {
+	if err.Width() > 0 {
 		// print erroneous line
-		line := err.Location.file.lines[err.Location.row]
-		formattedMessage +=
-			err.Location.file.lines[err.Location.row] + "\n"
+		line := err.File().GetLine(err.Row())
+		formattedMessage += line + "\n"
 
 		// position error marker
 		var index int
-		for index = 0; index < err.Location.column; index ++ {
+		for index = 0; index < err.Column(); index ++ {
 			if line[index] == '\t' {
 				formattedMessage += "\t"
 			} else {
@@ -67,7 +67,7 @@ func (err Error) Error () (formattedMessage string) {
 		}
 		
 		// print an arrow with a tail spanning the width of the mistake
-		for err.width > 1 {
+		for err.Width() > 1 {
 			if line[index] == '\t' {
 				formattedMessage += "--------"
 			} else {