borrow parsers (when it's possible)

src/fragments/address.rs

@@ -14,40 +14,40 @@ use crate::fragments::misc_token::phrase;
 use crate::fragments::whitespace::{cfws};
 use crate::error::IMFError;
 
-impl<'a> TryFrom<&'a lazy::Mailbox<'a>> for MailboxRef {
+impl<'a> TryFrom<lazy::Mailbox<'a>> for MailboxRef {
     type Error = IMFError<'a>;
 
-    fn try_from(mx: &'a lazy::Mailbox<'a>) -> Result<Self, Self::Error> {
+    fn try_from(mx: lazy::Mailbox<'a>) -> Result<Self, Self::Error> {
         mailbox(mx.0)
             .map(|(_, m)| m)
             .map_err(|e| IMFError::Mailbox(e))
     }
 }
 
-impl<'a> TryFrom<&'a lazy::MailboxList<'a>> for MailboxList {
+impl<'a> TryFrom<lazy::MailboxList<'a>> for MailboxList {
     type Error = IMFError<'a>;
 
-    fn try_from(ml: &'a lazy::MailboxList<'a>) -> Result<Self, Self::Error> {
+    fn try_from(ml: lazy::MailboxList<'a>) -> Result<Self, Self::Error> {
         mailbox_list(ml.0)
             .map(|(_, m)| m)
             .map_err(|e| IMFError::MailboxList(e))
     }
 }
 
-impl<'a> TryFrom<&'a lazy::AddressList<'a>> for AddressList {
+impl<'a> TryFrom<lazy::AddressList<'a>> for AddressList {
     type Error = IMFError<'a>;
 
-    fn try_from(al: &'a lazy::AddressList<'a>) -> Result<Self, Self::Error> {
+    fn try_from(al: lazy::AddressList<'a>) -> Result<Self, Self::Error> {
         address_list(al.0)
             .map(|(_, a)| a)
             .map_err(|e| IMFError::AddressList(e))
     }
 }
 
-impl<'a> TryFrom<&'a lazy::NullableAddressList<'a>> for AddressList {
+impl<'a> TryFrom<lazy::NullableAddressList<'a>> for AddressList {
     type Error = IMFError<'a>;
 
-    fn try_from(nal: &'a lazy::NullableAddressList<'a>) -> Result<Self, Self::Error> {
+    fn try_from(nal: lazy::NullableAddressList<'a>) -> Result<Self, Self::Error> {
         opt(alt((address_list, address_list_cfws)))(nal.0)
             .map(|(_, a)| a.unwrap_or(vec![]))
             .map_err(|e| IMFError::NullableAddressList(e))

src/fragments/datetime.rs

@@ -18,10 +18,10 @@ use crate::error::IMFError;
 const MIN: i32 = 60;
 const HOUR: i32 = 60 * MIN;
 
-impl<'a> TryFrom<&'a lazy::DateTime<'a>> for DateTime<FixedOffset> {
+impl<'a> TryFrom<lazy::DateTime<'a>> for DateTime<FixedOffset> {
     type Error = IMFError<'a>;
 
-    fn try_from(value: &'a lazy::DateTime<'a>) -> Result<Self, Self::Error> {
+    fn try_from(value: lazy::DateTime<'a>) -> Result<Self, Self::Error> {
         match section(value.0) {
             Ok((_, Some(dt))) => Ok(dt),
             Err(e) => Err(IMFError::DateTimeParse(e)),

src/fragments/eager.rs

@@ -45,10 +45,10 @@ pub enum Field<'a> {
 }
 use Field::*;
 
-impl<'a> TryFrom<&'a Lazy<'a>> for Field<'a> {
+impl<'a> TryFrom<Lazy<'a>> for Field<'a> {
     type Error = IMFError<'a>;
 
-    fn try_from(l: &'a Lazy<'a>) -> Result<Self, Self::Error> {
+    fn try_from(l: Lazy<'a>) -> Result<Self, Self::Error> {
         match l {
             Lazy::Date(v) => v.try_into().map(|v| Date(v)),
             Lazy::From(v) => v.try_into().map(|v| From(v)),
@@ -66,7 +66,7 @@ impl<'a> TryFrom<&'a Lazy<'a>> for Field<'a> {
             Lazy::Received(v) => v.try_into().map(|v| Received(v)),
             Lazy::ReturnPath(v) => v.try_into().map(|v| ReturnPath(v)),
             Lazy::Optional(k, v) => v.try_into().map(|v| Optional(k, v)),
-            Lazy::Rescue(v) => Ok(Rescue(*v)),
+            Lazy::Rescue(v) => Ok(Rescue(v)),
         }
     }
 }

src/fragments/identification.rs

@@ -15,20 +15,20 @@ use crate::fragments::mailbox::is_dtext;
 use crate::fragments::model::{MessageId, MessageIdList};
 use crate::error::IMFError;
 
-impl<'a> TryFrom<&'a lazy::Identifier<'a>> for MessageId<'a> {
+impl<'a> TryFrom<lazy::Identifier<'a>> for MessageId<'a> {
     type Error = IMFError<'a>;
 
-    fn try_from(id: &'a lazy::Identifier<'a>) -> Result<Self, Self::Error> {
+    fn try_from(id: lazy::Identifier<'a>) -> Result<Self, Self::Error> {
         msg_id(id.0)
             .map(|(_, i)| i)
             .map_err(|e| IMFError::MessageID(e))
     }
 }
 
-impl<'a> TryFrom<&'a lazy::IdentifierList<'a>> for MessageIdList<'a> {
+impl<'a> TryFrom<lazy::IdentifierList<'a>> for MessageIdList<'a> {
     type Error = IMFError<'a>;
 
-    fn try_from(id: &'a lazy::IdentifierList<'a>) -> Result<Self, Self::Error> {
+    fn try_from(id: lazy::IdentifierList<'a>) -> Result<Self, Self::Error> {
         many1(msg_id)(id.0)
             .map(|(_, i)| i)
             .map_err(|e| IMFError::MessageIDList(e))

src/fragments/misc_token.rs

@@ -21,20 +21,20 @@ pub struct Unstructured(pub String);
 #[derive(Debug, PartialEq, Default)]
 pub struct PhraseList(pub Vec<String>);
 
-impl<'a> TryFrom<&'a lazy::Unstructured<'a>> for Unstructured {
+impl<'a> TryFrom<lazy::Unstructured<'a>> for Unstructured {
     type Error = IMFError<'a>;
 
-    fn try_from(input: &'a lazy::Unstructured<'a>) -> Result<Self, Self::Error> {
+    fn try_from(input: lazy::Unstructured<'a>) -> Result<Self, Self::Error> {
         unstructured(input.0)
             .map(|(_, v)| Unstructured(v))
             .map_err(|e| IMFError::Unstructured(e))
     } 
 }
 
-impl<'a> TryFrom<&'a lazy::PhraseList<'a>> for PhraseList {
+impl<'a> TryFrom<lazy::PhraseList<'a>> for PhraseList {
     type Error = IMFError<'a>;
 
-    fn try_from(p: &'a lazy::PhraseList<'a>) -> Result<Self, Self::Error> {
+    fn try_from(p: lazy::PhraseList<'a>) -> Result<Self, Self::Error> {
         separated_list1(tag(","), phrase)(p.0)
             .map(|(_, q)| PhraseList(q))
             .map_err(|e| IMFError::PhraseList(e))

src/fragments/section.rs

@@ -49,11 +49,10 @@ pub struct Section<'a> {
 
 //@FIXME min and max limits are not enforced,
 // it may result in missing data or silently overriden data.
-impl<'a> From<Vec<Field<'a>>> for Section<'a> {
-    fn from(field_list: Vec<Field<'a>>) -> Self {
-        field_list.into_iter().fold(
-            Section::default(),
-            |mut section, field| {
+impl<'a> FromIterator<Field<'a>> for Section<'a> {
+    fn from_iter<I: IntoIterator<Item=Field<'a>>>(iter: I) -> Self {
+        let mut section = Section::default();
+        for field in iter {
             match field {
                 Field::Date(v) => section.date = Some(v),
                 Field::From(v) => section.from.extend(v),
@@ -72,10 +71,9 @@ impl<'a> From<Vec<Field<'a>>> for Section<'a> {
                 Field::Received(v) => section.received.push(v),
                 Field::Optional(k, v) => { section.optional.insert(k, v); },
                 Field::Rescue(v) => section.unparsed.push(v),
-                };
-                section
             }
-        )
+        }
+        section
     }
 }
 

src/fragments/trace.rs

@@ -14,10 +14,10 @@ use crate::error::IMFError;
 #[derive(Debug, PartialEq)]
 pub struct ReceivedLog<'a>(pub &'a str);
 
-impl<'a> TryFrom<&'a lazy::ReceivedLog<'a>> for ReceivedLog<'a> {
+impl<'a> TryFrom<lazy::ReceivedLog<'a>> for ReceivedLog<'a> {
     type Error = IMFError<'a>;
 
-    fn try_from(input: &'a lazy::ReceivedLog<'a>) -> Result<Self, Self::Error> {
+    fn try_from(input: lazy::ReceivedLog<'a>) -> Result<Self, Self::Error> {
         received_body(input.0)
             .map_err(|e| IMFError::ReceivedLog(e))
             .map(|(_, v)| ReceivedLog(v))

src/multipass/field_eager.rs

@@ -7,10 +7,10 @@ pub struct Parsed<'a> {
     pub body: &'a [u8],
 }
 
-impl<'a> From <&'a field_lazy::Parsed<'a>> for Parsed<'a> {
-    fn from(p: &'a field_lazy::Parsed<'a>) -> Self {
+impl<'a> From <field_lazy::Parsed<'a>> for Parsed<'a> {
+    fn from(p: field_lazy::Parsed<'a>) -> Self {
         Parsed {
-            fields: p.fields.iter().filter_map(|entry| entry.try_into().ok()).collect(),
+            fields: p.fields.into_iter().filter_map(|entry| entry.try_into().ok()).collect(),
             body: p.body,
         }
     }
@@ -25,7 +25,7 @@ mod tests {
 
     #[test]
     fn test_field_body() {
-        assert_eq!(Parsed::from(&field_lazy::Parsed {
+        assert_eq!(Parsed::from(field_lazy::Parsed {
             fields: vec![
                 lazy::Field::From(lazy::MailboxList("hello@world.com,\r\n\talice@wonderlands.com\r\n")),
                 lazy::Field::Date(lazy::DateTime("12 Mar 1997 07:33:25 Z\r\n")),

src/multipass/field_lazy.rs

@@ -7,8 +7,8 @@ pub struct Parsed<'a> {
     pub body: &'a [u8],
 }
 
-impl<'a> From <&'a ExtractFields<'a>> for Parsed<'a> {
-    fn from(ef: &'a ExtractFields<'a>) -> Self {
+impl<'a> From <ExtractFields<'a>> for Parsed<'a> {
+    fn from(ef: ExtractFields<'a>) -> Self {
         Parsed {
             fields: ef.fields.iter().map(|e| (*e).into()).collect(),
             body: ef.body,
@@ -22,7 +22,7 @@ mod tests {
 
     #[test]
     fn test_field_name() {
-        assert_eq!(Parsed::from(&ExtractFields {
+        assert_eq!(Parsed::from(ExtractFields {
             fields: vec![
                 "From: hello@world.com,\r\n\talice@wonderlands.com\r\n",
                 "Date: 12 Mar 1997 07:33:25 Z\r\n",

src/multipass/guess_charset.rs

@@ -16,8 +16,8 @@ const IS_LAST_BUFFER: bool = true;
 const ALLOW_UTF8: bool = true;
 const NO_TLD: Option<&[u8]> = None;
 
-impl<'a> From<&'a Segment<'a>> for GuessCharset<'a> {
-    fn from(seg: &'a Segment<'a>) -> Self {
+impl<'a> From<Segment<'a>> for GuessCharset<'a> {
+    fn from(seg: Segment<'a>) -> Self {
         // Create detector
         let mut detector = EncodingDetector::new();
         detector.feed(&seg.header, IS_LAST_BUFFER);
@@ -37,7 +37,7 @@ mod tests {
     #[test]
     fn test_charset() {
         assert_eq!(
-            GuessCharset::from(&Segment {
+            GuessCharset::from(Segment {
                 body: b"Hello world!", 
                 header: b"From: hello@world.com\r\nDate: 12 Mar 1997 07:33:25 Z\r\n",
             }),

src/multipass/header_section.rs

@@ -10,7 +10,7 @@ pub struct Parsed<'a> {
 impl<'a> From<field_eager::Parsed<'a>> for Parsed<'a> {
     fn from(p: field_eager::Parsed<'a>) -> Self {
         Parsed {
-            fields: p.fields.into(),
+            fields: Section::from_iter(p.fields.into_iter()),
             body: p.body,
         }
     }