error tolerant parsing

errors/error.go

@@ -0,0 +1,31 @@
+package errors
+
+import (
+	"fmt"
+
+	"github.com/z7zmey/php-parser/position"
+	"github.com/z7zmey/php-parser/token"
+)
+
+// Error parsing error
+type Error struct {
+	Msg string
+	Pos position.Position
+}
+
+// NewError creates and returns new Error
+func NewError(msg string, t token.Token) *Error {
+	return &Error{
+		Msg: msg,
+		Pos: position.Position{
+			StartLine: t.StartLine,
+			EndLine:   t.EndLine,
+			StartPos:  t.StartPos,
+			EndPos:    t.EndPos,
+		},
+	}
+}
+
+func (e *Error) String() string {
+	return fmt.Sprintf("%s at line %d", e.Msg, e.Pos.StartLine)
+}