add impl Deserializer for BatchInfo

lib/src/questions.rs

@@ -1,4 +1,13 @@
-use serde_derive::{Deserialize, Serialize};
+use std::{
+    fmt::{self, Formatter},
+    marker::PhantomData,
+};
+
+use serde::{
+    de::{MapAccess, SeqAccess, Visitor},
+    Deserialize, Deserializer,
+};
+
 use serde::ser::SerializeStruct;
 
 use bitflags::bitflags;
@@ -45,33 +54,20 @@ bitflags! {
     }
 }
 
-#[derive(Debug, Default, Clone, Deserialize, PartialEq)]
+#[derive(Debug, Default, Clone, PartialEq)]
 pub struct BatchInfo {
-    #[serde(default)]
     pub filename: String,
-    #[serde(default)]
     pub description: String,
-    #[serde(default)]
     pub author: String,
-    #[serde(default)]
     pub comment: String,
-    #[serde(default)]
     pub url: String,
-    #[serde(default)]
     pub date: String,
-    #[serde(default)]
     pub processed_by: String,
-    #[serde(default)]
     pub redacted_by: String,
-    #[serde(default)]
     pub copyright: String,
-    #[serde(default)]
     pub theme: String,
-    #[serde(default)]
     pub kind: String,
-    #[serde(default)]
     pub source: String,
-    #[serde(default)]
     pub rating: String,
 }
 
@@ -149,8 +145,8 @@ impl serde::Serialize for BatchInfo {
         let mut len = 1; // (+flags)
 
         count_string_fields!((self, flags, len, BatchFlags) <- {
-            filename: FILENAME, description: DESCRIPTION, author: AUTHOR, comment: COMMENT, url: URL, date: DATE,
-            processed_by: PROCESSED, copyright: COPYRIGHT, theme: THEME, kind: KIND, source: SOURCE, rating: RATING
+            filename: FILENAME, description: DESCRIPTION, author: AUTHOR, comment: COMMENT, url: URL, date: DATE, processed_by: PROCESSED,
+            redacted_by: REDACTED, copyright: COPYRIGHT, theme: THEME, kind: KIND, source: SOURCE, rating: RATING
         });
 
         let mut state = serializer.serialize_struct("BatchInfo", len)?;
@@ -162,8 +158,8 @@ impl serde::Serialize for BatchInfo {
         }
 
         serialize_fields!((self, flags, state, BatchFlags) <- {
-            filename: FILENAME, description: DESCRIPTION, author: AUTHOR, comment: COMMENT, url: URL, date: DATE,
-            processed_by: PROCESSED, copyright: COPYRIGHT, theme: THEME, kind: KIND, source: SOURCE, rating: RATING
+            filename: FILENAME, description: DESCRIPTION, author: AUTHOR, comment: COMMENT, url: URL, date: DATE, processed_by: PROCESSED,
+            redacted_by: REDACTED, copyright: COPYRIGHT, theme: THEME, kind: KIND, source: SOURCE, rating: RATING
         });
 
         state.end()
@@ -227,6 +223,269 @@ impl serde::Serialize for Question {
     }
 }
 
+impl<'de> Deserialize<'de> for BatchInfo {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        #[allow(non_camel_case_types)]
+        #[doc(hidden)]
+        enum BatchField {
+            filename,
+            description,
+            author,
+            comment,
+            url,
+            date,
+            processed_by,
+            redacted_by,
+            copyright,
+            theme,
+            kind,
+            source,
+            rating,
+            _flags,
+            __ignore,
+        }
+
+        struct BatchFieldVisitor;
+        impl<'de> Visitor<'de> for BatchFieldVisitor {
+            type Value = BatchField;
+            fn expecting(&self, formatter: &mut Formatter) -> fmt::Result {
+                Formatter::write_str(formatter, "field identifier")
+            }
+            fn visit_u64<E>(self, value: u64) -> Result<Self::Value, E>
+            where
+                E: serde::de::Error,
+            {
+                match value {
+                    0u64 => Ok(BatchField::filename),
+                    1u64 => Ok(BatchField::description),
+                    2u64 => Ok(BatchField::author),
+                    3u64 => Ok(BatchField::comment),
+                    4u64 => Ok(BatchField::url),
+                    5u64 => Ok(BatchField::date),
+                    6u64 => Ok(BatchField::processed_by),
+                    7u64 => Ok(BatchField::redacted_by),
+                    8u64 => Ok(BatchField::copyright),
+                    9u64 => Ok(BatchField::theme),
+                    10u64 => Ok(BatchField::kind),
+                    11u64 => Ok(BatchField::source),
+                    12u64 => Ok(BatchField::rating),
+                    13u64 => Ok(BatchField::_flags),
+                    _ => Ok(BatchField::__ignore),
+                }
+            }
+            fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
+            where
+                E: serde::de::Error,
+            {
+                match value {
+                    "filename" => Ok(BatchField::filename),
+                    "description" => Ok(BatchField::description),
+                    "author" => Ok(BatchField::author),
+                    "comment" => Ok(BatchField::comment),
+                    "url" => Ok(BatchField::url),
+                    "date" => Ok(BatchField::date),
+                    "processed_by" => Ok(BatchField::processed_by),
+                    "redacted_by" => Ok(BatchField::redacted_by),
+                    "copyright" => Ok(BatchField::copyright),
+                    "theme" => Ok(BatchField::theme),
+                    "kind" => Ok(BatchField::kind),
+                    "source" => Ok(BatchField::source),
+                    "rating" => Ok(BatchField::rating),
+                    "_flags" => Ok(BatchField::_flags),
+                    _ => Ok(BatchField::__ignore),
+                }
+            }
+            fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E>
+            where
+                E: serde::de::Error,
+            {
+                match value {
+                    b"filename" => Ok(BatchField::filename),
+                    b"description" => Ok(BatchField::description),
+                    b"author" => Ok(BatchField::author),
+                    b"comment" => Ok(BatchField::comment),
+                    b"url" => Ok(BatchField::url),
+                    b"date" => Ok(BatchField::date),
+                    b"processed_by" => Ok(BatchField::processed_by),
+                    b"redacted_by" => Ok(BatchField::redacted_by),
+                    b"copyright" => Ok(BatchField::copyright),
+                    b"theme" => Ok(BatchField::theme),
+                    b"kind" => Ok(BatchField::kind),
+                    b"source" => Ok(BatchField::source),
+                    b"rating" => Ok(BatchField::rating),
+                    b"_flags" => Ok(BatchField::_flags),
+                    _ => Ok(BatchField::__ignore),
+                }
+            }
+        }
+        impl<'de> Deserialize<'de> for BatchField {
+            #[inline]
+            fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                Deserializer::deserialize_identifier(deserializer, BatchFieldVisitor)
+            }
+        }
+        #[doc(hidden)]
+        struct BatchInfoVisitor<'de> {
+            marker: PhantomData<BatchInfo>,
+            lifetime: PhantomData<&'de ()>,
+        }
+        impl<'de> Visitor<'de> for BatchInfoVisitor<'de> {
+            type Value = BatchInfo;
+            fn expecting(&self, formatter: &mut Formatter) -> fmt::Result {
+                Formatter::write_str(formatter, "struct BatchInfo")
+            }
+            #[inline]
+            fn visit_seq<V>(self, mut seq: V) -> Result<Self::Value, V::Error>
+            where
+                V: SeqAccess<'de>,
+            {
+                let _flags = BatchFlags::from_bits(
+                    SeqAccess::next_element::<u16>(&mut seq)?.unwrap_or_default(),
+                )
+                .unwrap_or_default();
+
+                macro_rules! seq_read_strings {
+                    (($flags:ident, $seq:ident, $FlagsType:ident) <- {$($field:ident:$flag:ident),+} ) => {$(
+                        let $field: String = if $flags.intersects($FlagsType::$flag) {
+                            SeqAccess::next_element::<String>(&mut seq)?.unwrap_or_default()
+                        } else {
+                            Default::default()
+                        };
+                    )+}
+                }
+
+                seq_read_strings!((_flags, seq, BatchFlags) <- {
+                    filename: FILENAME, description: DESCRIPTION, author: AUTHOR, comment: COMMENT, url: URL, date: DATE, processed_by: PROCESSED,
+                    redacted_by: REDACTED, copyright: COPYRIGHT, theme: THEME, kind: KIND, source: SOURCE, rating: RATING
+                });
+
+                Ok(BatchInfo {
+                    filename,
+                    description,
+                    author,
+                    comment,
+                    url,
+                    date,
+                    processed_by,
+                    redacted_by,
+                    copyright,
+                    theme,
+                    kind,
+                    source,
+                    rating,
+                })
+            }
+            #[inline]
+            fn visit_map<V>(self, mut map: V) -> Result<Self::Value, V::Error>
+            where
+                V: MapAccess<'de>,
+            {
+                let mut filename: Option<String> = None;
+                let mut description: Option<String> = None;
+                let mut author: Option<String> = None;
+                let mut comment: Option<String> = None;
+                let mut url: Option<String> = None;
+                let mut date: Option<String> = None;
+                let mut processed_by: Option<String> = None;
+                let mut redacted_by: Option<String> = None;
+                let mut copyright: Option<String> = None;
+                let mut theme: Option<String> = None;
+                let mut kind: Option<String> = None;
+                let mut source: Option<String> = None;
+                let mut rating: Option<String> = None;
+
+                macro_rules! match_map_fields {
+                    (($map:ident, $key:ident, $FieldType:ident) <- {$($field:ident),+} ) => {
+                        match $key {
+                        $(
+                            $FieldType::$field => {
+                                if $field.is_some() {
+                                    return Err(<V::Error as serde::de::Error>::duplicate_field(
+                                        std::stringify!($field),
+                                    ));
+                                }
+                                $field = Some(MapAccess::next_value::<String>(&mut $map)?);
+                            },
+                        )+
+                        _ => {
+                            let _ = MapAccess::next_value::<serde::de::IgnoredAny>(&mut $map)?;
+                        }
+                      }
+                  }
+                }
+
+                while let Some(key) = MapAccess::next_key::<BatchField>(&mut map)? {
+                    match_map_fields!((map, key, BatchField) <- {
+                        filename, description, author, comment, url, date, processed_by,
+                        redacted_by, copyright, theme, kind, source, rating
+                    });
+                }
+
+                let filename = filename.unwrap_or_default();
+                let description = description.unwrap_or_default();
+                let author = author.unwrap_or_default();
+                let comment = comment.unwrap_or_default();
+                let url = url.unwrap_or_default();
+                let date = date.unwrap_or_default();
+                let processed_by = processed_by.unwrap_or_default();
+                let redacted_by = redacted_by.unwrap_or_default();
+                let copyright = copyright.unwrap_or_default();
+                let theme = theme.unwrap_or_default();
+                let kind = kind.unwrap_or_default();
+                let source = source.unwrap_or_default();
+                let rating = rating.unwrap_or_default();
+
+                Ok(BatchInfo {
+                    filename,
+                    description,
+                    author,
+                    comment,
+                    url,
+                    date,
+                    processed_by,
+                    redacted_by,
+                    copyright,
+                    theme,
+                    kind,
+                    source,
+                    rating,
+                })
+            }
+        }
+        #[doc(hidden)]
+        const FIELDS: &[&str] = &[
+            "filename",
+            "description",
+            "author",
+            "comment",
+            "url",
+            "date",
+            "processed_by",
+            "redacted_by",
+            "copyright",
+            "theme",
+            "kind",
+            "source",
+            "rating",
+        ];
+        Deserializer::deserialize_struct(
+            deserializer,
+            "BatchInfo",
+            FIELDS,
+            BatchInfoVisitor {
+                marker: PhantomData::<BatchInfo>,
+                lifetime: PhantomData,
+            },
+        )
+    }
+}
+
 #[cfg(any(feature = "convert", feature = "convert_async"))]
 pub mod convert_common {
     use super::{BatchInfo, Question};