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support deserializing borrowed strings

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Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
This commit is contained in:
Wolfgang Bumiller 2020-11-27 13:38:49 +01:00
parent 0bab1226bb
commit 35b138f2c6
1 changed files with 20 additions and 5 deletions
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25
perlmod/src/de.rs
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@ -31,7 +31,8 @@ where
/// Deserialize a reference to a perl [`Value`](crate::Value).
///
/// Note that this causes all the underlying data to be copied recursively, except for data
/// deserialized to `&[u8]`, which will reference the original value.
/// deserialized to `&[u8]` or `&str`, which will reference the "original" value (whatever that
/// means for perl).
pub fn from_ref_value<'de, T>(input: &'de Value) -> Result<T, Error>
where
T: Deserialize<'de>,
@ -91,7 +92,8 @@ impl<'deserializer> Deserializer<'deserializer> {
use crate::scalar::Flags;
if flags.contains(Flags::STRING) {
visitor.visit_str(value.pv_string_utf8())
let s = unsafe { str_set_wrong_lifetime(value.pv_string_utf8()) };
visitor.visit_borrowed_str(s)
} else if flags.contains(Flags::DOUBLE) {
visitor.visit_f64(value.nv())
} else if flags.contains(Flags::INTEGER) {
@ -123,7 +125,8 @@ impl<'deserializer> Deserializer<'deserializer> {
} else if flags.contains(Flags::DOUBLE) {
visitor.visit_f64(value.nv())
} else if flags.contains(Flags::STRING) {
visitor.visit_str(value.pv_string_utf8())
let s = unsafe { str_set_wrong_lifetime(value.pv_string_utf8()) };
visitor.visit_borrowed_str(s)
} else {
visitor.visit_unit()
}
@ -151,7 +154,8 @@ impl<'deserializer> Deserializer<'deserializer> {
} else if flags.contains(Flags::INTEGER) {
visitor.visit_i64(value.iv() as i64)
} else if flags.contains(Flags::STRING) {
visitor.visit_str(value.pv_string_utf8())
let s = unsafe { str_set_wrong_lifetime(value.pv_string_utf8()) };
visitor.visit_borrowed_str(s)
} else {
visitor.visit_unit()
}
@ -165,6 +169,14 @@ impl<'deserializer> Deserializer<'deserializer> {
}
}
/// We use this only for `Value`s in our deserializer. We know this works because serde says the
/// lifetime needs to only live as long as the serializer, and we feed our serializer with the data
/// from a borrowed Value (keeping references to all the contained data within perl), which lives
/// longer than the deserializer.
unsafe fn str_set_wrong_lifetime<'a, 'b>(s: &'a str) -> &'b str {
std::str::from_utf8_unchecked(std::slice::from_raw_parts(s.as_ptr(), s.len()))
}
impl<'de, 'a> de::Deserializer<'de> for &'a mut Deserializer<'de> {
type Error = Error;
@ -291,7 +303,10 @@ impl<'de, 'a> de::Deserializer<'de> for &'a mut Deserializer<'de> {
let mut chars = s.chars();
match chars.next() {
Some(ch) if chars.next().is_none() => visitor.visit_char(ch),
_ => visitor.visit_str(value.pv_string_utf8()),
_ => {
let s = unsafe { str_set_wrong_lifetime(value.pv_string_utf8()) };
visitor.visit_borrowed_str(s)
}
}
} else {
visitor.visit_unit()