1 files changed, 53 insertions, 0 deletions
diff --git a/errhandlers/errhandlers.go b/errhandlers/errhandlers.go
new file mode 100644
index 0000000..a9f8054
--- /dev/null
+++ b/errhandlers/errhandlers.go
@@ -0,0 +1,53 @@
+/* mal2go - MyAnimeList V2 API wrapper for Go
+ * Copyright (C) 2022  Vidhu Kant Sharma <vidhukant@protonmail.ch>
+
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>. */
+
+package errhandlers
+
+import (
+  "errors"
+  "fmt"
+  "github.com/MikunoNaka/mal2go/util"
+)
+
+// if fields aren't specified
+func FieldsErrHandler(fields []string) ([]string, error) {
+  if cap(fields) == 0 {
+    // uses all the default fields if none specified
+    return util.DefaultFields, nil
+  }
+
+  // checks if each given field is valid
+  for _, j := range(fields) {
+    if !IsValidField(j) {
+      return []string{}, errors.New(fmt.Sprintf("InvalidFieldError: Invalid field specified: \"%s\"", j))
+    }
+  }
+
+  // everything's fine!
+  return fields, nil
+}
+
+// if limit or error specified are above the limit
+func LimitsErrHandler(limit, offset, maxLimit int) error {
+  maxOffset := maxLimit - limit
+  if limit > maxLimit {
+    return errors.New(fmt.Sprintf("InvalidLimitError: Limit specified too high (%d > %d).", limit, maxLimit))
+  } else if offset > maxOffset {
+    return errors.New(fmt.Sprintf("InvalidOffsetError: Offset specified too high (%d > %d).", offset, maxOffset))
+  }
+  // return nil if no error
+  return nil
+}