Renamed error module to infoerr

infoerr/error.go

@@ -0,0 +1,99 @@
+package infoerr
+
+import "os"
+import "fmt"
+import "git.tebibyte.media/sashakoshka/arf/file"
+
+type ErrorKind int
+
+const (
+	ErrorKindError ErrorKind = iota
+	ErrorKindWarn
+)
+
+type Error struct {
+	file.Location 
+	message string
+	kind    ErrorKind
+}
+
+// NewError creates a new error at the specified location.
+func NewError (
+	location file.Location,
+	message string,
+	kind ErrorKind,
+) (
+	err Error,
+) {
+	return Error {
+		Location: location,
+		message:  message,
+		kind:     kind,
+	}
+}
+
+// Error returns a formatted error message as a string.
+func (err Error) Error () (formattedMessage string) {
+	switch err.kind {
+	case ErrorKindError:
+		formattedMessage += "\033[31mERR\033[0m"
+	case ErrorKindWarn:
+		formattedMessage += "\033[33m!!!\033[0m"
+	}
+
+	// print information about the location of the mistake
+	if err.Width() > 0 {
+		formattedMessage += fmt.Sprint (
+			" \033[34m", err.Row() + 1,
+			":", err.Column() + 1)
+	}
+	formattedMessage +=
+		" \033[90min\033[0m " +
+		err.File().Path() + "\n"
+	
+	if err.Width() > 0 {
+		// print erroneous line
+		line := err.File().GetLine(err.Row())
+		formattedMessage += line + "\n"
+
+		// position error marker
+		var index int
+		for index = 0; index < err.Column(); index ++ {
+			if line[index] == '\t' {
+				formattedMessage += "\t"
+			} else {
+				formattedMessage += " "
+			}
+		}
+		
+		// print an arrow with a tail spanning the width of the mistake
+		for err.Width() > 1 {
+			if line[index] == '\t' {
+				formattedMessage += "--------"
+			} else {
+				formattedMessage += "-"
+			}
+			index ++
+		}
+		
+		formattedMessage += "^\n"
+	}
+	formattedMessage += err.message + "\n"
+
+	return
+}
+
+// Print formats the error and prints it to stderr.
+func (err Error) Print () {
+	os.Stderr.Write([]byte(err.Error()))
+}
+
+// Message returns the error's message string
+func (err Error) Message () (message string) {
+	return err.message
+}
+
+// Kind returns what kind of error the error is.
+func (err Error) Kind () (kind ErrorKind) {
+	return err.kind
+}