mirror of
https://github.com/denoland/deno.git
synced 2024-12-04 17:18:23 -05:00
768 lines
21 KiB
Rust
768 lines
21 KiB
Rust
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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use serde::de::{self, Visitor};
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use serde::Deserialize;
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use crate::error::{Error, Result};
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use crate::keys::{v8_struct_key, KeyCache};
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use crate::magic::transl8::FromV8;
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use crate::magic::transl8::{visit_magic, MagicType};
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use crate::payload::ValueType;
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use crate::{
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magic, ByteString, DetachedBuffer, StringOrBuffer, U16String, ZeroCopyBuf,
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};
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pub struct Deserializer<'a, 'b, 's> {
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input: v8::Local<'a, v8::Value>,
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scope: &'b mut v8::HandleScope<'s>,
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_key_cache: Option<&'b mut KeyCache>,
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}
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impl<'a, 'b, 's> Deserializer<'a, 'b, 's> {
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pub fn new(
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scope: &'b mut v8::HandleScope<'s>,
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input: v8::Local<'a, v8::Value>,
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key_cache: Option<&'b mut KeyCache>,
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) -> Self {
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Deserializer {
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input,
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scope,
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_key_cache: key_cache,
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}
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}
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}
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// from_v8 deserializes a v8::Value into a Deserializable / rust struct
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pub fn from_v8<'de, 'a, 'b, 's, T>(
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scope: &'b mut v8::HandleScope<'s>,
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input: v8::Local<'a, v8::Value>,
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) -> Result<T>
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where
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T: Deserialize<'de>,
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{
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let mut deserializer = Deserializer::new(scope, input, None);
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let t = T::deserialize(&mut deserializer)?;
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Ok(t)
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}
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// like from_v8 except accepts a KeyCache to optimize struct key decoding
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pub fn from_v8_cached<'de, 'a, 'b, 's, T>(
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scope: &'b mut v8::HandleScope<'s>,
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input: v8::Local<'a, v8::Value>,
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key_cache: &mut KeyCache,
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) -> Result<T>
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where
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T: Deserialize<'de>,
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{
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let mut deserializer = Deserializer::new(scope, input, Some(key_cache));
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let t = T::deserialize(&mut deserializer)?;
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Ok(t)
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}
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macro_rules! deserialize_signed {
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($dmethod:ident, $vmethod:ident, $t:tt) => {
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fn $dmethod<V>(self, visitor: V) -> Result<V::Value>
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where
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V: Visitor<'de>,
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{
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visitor.$vmethod(
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if let Ok(x) = v8::Local::<v8::Number>::try_from(self.input) {
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x.value() as $t
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} else if let Ok(x) = v8::Local::<v8::BigInt>::try_from(self.input) {
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x.i64_value().0 as $t
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} else if let Some(x) = self.input.number_value(self.scope) {
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x as $t
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} else if let Some(x) = self.input.to_big_int(self.scope) {
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x.i64_value().0 as $t
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} else {
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return Err(Error::ExpectedInteger);
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},
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)
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}
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};
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}
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macro_rules! deserialize_unsigned {
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($dmethod:ident, $vmethod:ident, $t:tt) => {
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fn $dmethod<V>(self, visitor: V) -> Result<V::Value>
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where
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V: Visitor<'de>,
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{
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visitor.$vmethod(
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if let Ok(x) = v8::Local::<v8::Number>::try_from(self.input) {
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x.value() as $t
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} else if let Ok(x) = v8::Local::<v8::BigInt>::try_from(self.input) {
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x.u64_value().0 as $t
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} else if let Some(x) = self.input.number_value(self.scope) {
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x as $t
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} else if let Some(x) = self.input.to_big_int(self.scope) {
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x.u64_value().0 as $t
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} else {
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return Err(Error::ExpectedInteger);
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},
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)
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}
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};
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}
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impl<'de, 'a, 'b, 's, 'x> de::Deserializer<'de>
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for &'x mut Deserializer<'a, 'b, 's>
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{
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type Error = Error;
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fn deserialize_any<V>(self, visitor: V) -> Result<V::Value>
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where
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V: Visitor<'de>,
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{
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match ValueType::from_v8(self.input) {
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ValueType::Null => self.deserialize_unit(visitor),
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ValueType::Bool => self.deserialize_bool(visitor),
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// Handle floats & ints separately to work with loosely-typed serde_json
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ValueType::Number => {
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if self.input.is_uint32() {
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self.deserialize_u32(visitor)
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} else if self.input.is_int32() {
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self.deserialize_i32(visitor)
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} else {
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self.deserialize_f64(visitor)
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}
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}
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ValueType::String => self.deserialize_string(visitor),
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ValueType::Array => self.deserialize_seq(visitor),
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ValueType::Object => self.deserialize_map(visitor),
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// Map to Vec<u8> when deserialized via deserialize_any
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// e.g: for untagged enums or StringOrBuffer
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ValueType::ArrayBufferView | ValueType::ArrayBuffer => {
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magic::v8slice::V8Slice::from_v8(&mut *self.scope, self.input)
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.and_then(|zb| visitor.visit_byte_buf(Vec::from(&*zb)))
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}
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}
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}
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fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value>
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where
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V: Visitor<'de>,
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{
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// Relaxed typechecking, will map all non-true vals to false
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visitor.visit_bool(self.input.is_true())
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}
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// signed
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deserialize_signed!(deserialize_i8, visit_i8, i8);
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deserialize_signed!(deserialize_i16, visit_i16, i16);
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deserialize_signed!(deserialize_i32, visit_i32, i32);
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deserialize_signed!(deserialize_i64, visit_i64, i64);
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// unsigned
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deserialize_unsigned!(deserialize_u8, visit_u8, u8);
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deserialize_unsigned!(deserialize_u16, visit_u16, u16);
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deserialize_unsigned!(deserialize_u32, visit_u32, u32);
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deserialize_unsigned!(deserialize_u64, visit_u64, u64);
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fn deserialize_f32<V>(self, visitor: V) -> Result<V::Value>
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where
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V: Visitor<'de>,
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{
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self.deserialize_f64(visitor)
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}
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fn deserialize_f64<V>(self, visitor: V) -> Result<V::Value>
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where
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V: Visitor<'de>,
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{
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visitor.visit_f64(
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if let Ok(x) = v8::Local::<v8::Number>::try_from(self.input) {
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x.value() as f64
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} else if let Ok(x) = v8::Local::<v8::BigInt>::try_from(self.input) {
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bigint_to_f64(x)
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} else if let Some(x) = self.input.number_value(self.scope) {
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x as f64
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} else if let Some(x) = self.input.to_big_int(self.scope) {
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bigint_to_f64(x)
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} else {
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return Err(Error::ExpectedNumber);
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},
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)
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}
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fn deserialize_char<V>(self, visitor: V) -> Result<V::Value>
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where
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V: Visitor<'de>,
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{
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self.deserialize_str(visitor)
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}
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fn deserialize_str<V>(self, visitor: V) -> Result<V::Value>
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where
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V: Visitor<'de>,
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{
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self.deserialize_string(visitor)
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}
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fn deserialize_string<V>(self, visitor: V) -> Result<V::Value>
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where
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V: Visitor<'de>,
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{
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if self.input.is_string() || self.input.is_string_object() {
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let v8_string = self.input.to_string(self.scope).unwrap();
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let string = to_utf8(v8_string, self.scope);
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visitor.visit_string(string)
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} else {
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Err(Error::ExpectedString)
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}
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}
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fn deserialize_option<V>(self, visitor: V) -> Result<V::Value>
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where
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V: Visitor<'de>,
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{
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if self.input.is_null_or_undefined() {
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visitor.visit_none()
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} else {
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visitor.visit_some(self)
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}
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}
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fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value>
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where
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V: Visitor<'de>,
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{
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visitor.visit_unit()
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}
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fn deserialize_unit_struct<V>(
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self,
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_name: &'static str,
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visitor: V,
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) -> Result<V::Value>
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where
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V: Visitor<'de>,
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{
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self.deserialize_unit(visitor)
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}
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// As is done here, serializers are encouraged to treat newtype structs as
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// insignificant wrappers around the data they contain. That means not
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// parsing anything other than the contained value.
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fn deserialize_newtype_struct<V>(
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self,
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_name: &'static str,
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visitor: V,
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) -> Result<V::Value>
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where
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V: Visitor<'de>,
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{
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visitor.visit_newtype_struct(self)
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}
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fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value>
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where
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V: Visitor<'de>,
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{
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let arr = v8::Local::<v8::Array>::try_from(self.input)
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.map_err(|_| Error::ExpectedArray)?;
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let len = arr.length();
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let obj = v8::Local::<v8::Object>::from(arr);
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let seq = SeqAccess {
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pos: 0,
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len,
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obj,
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scope: self.scope,
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};
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visitor.visit_seq(seq)
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}
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// Like deserialize_seq except it prefers tuple's length over input array's length
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fn deserialize_tuple<V>(self, len: usize, visitor: V) -> Result<V::Value>
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where
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V: Visitor<'de>,
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{
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let obj = v8::Local::<v8::Object>::try_from(self.input).unwrap();
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if obj.is_array() {
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// If the obj is an array fail if it's length differs from the tuple length
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let array = v8::Local::<v8::Array>::try_from(self.input).unwrap();
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if array.length() as usize != len {
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return Err(Error::LengthMismatch);
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}
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}
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let seq = SeqAccess {
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pos: 0,
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len: len as u32,
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obj,
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scope: self.scope,
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};
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visitor.visit_seq(seq)
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}
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// Tuple structs look just like sequences in JSON.
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fn deserialize_tuple_struct<V>(
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self,
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_name: &'static str,
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len: usize,
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visitor: V,
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) -> Result<V::Value>
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where
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V: Visitor<'de>,
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{
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self.deserialize_tuple(len, visitor)
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}
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fn deserialize_map<V>(self, visitor: V) -> Result<V::Value>
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where
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V: de::Visitor<'de>,
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{
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// Assume object, then get_own_property_names
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let obj = v8::Local::<v8::Object>::try_from(self.input)
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.map_err(|_| Error::ExpectedObject)?;
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if v8::Local::<v8::Map>::try_from(self.input).is_ok() {
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let pairs_array = v8::Local::<v8::Map>::try_from(self.input)
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.unwrap()
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.as_array(self.scope);
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let map = MapPairsAccess {
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pos: 0,
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len: pairs_array.length(),
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obj: pairs_array,
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scope: self.scope,
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};
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visitor.visit_map(map)
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} else {
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let prop_names = obj.get_own_property_names(self.scope);
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let keys: Vec<magic::Value> = match prop_names {
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Some(names) => from_v8(self.scope, names.into()).unwrap(),
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None => vec![],
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};
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let map = MapObjectAccess {
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obj,
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keys: keys.into_iter(),
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next_value: None,
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scope: self.scope,
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};
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visitor.visit_map(map)
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}
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}
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fn deserialize_struct<V>(
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self,
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name: &'static str,
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fields: &'static [&'static str],
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visitor: V,
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) -> Result<V::Value>
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where
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V: Visitor<'de>,
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{
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match name {
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ZeroCopyBuf::MAGIC_NAME => {
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visit_magic(visitor, ZeroCopyBuf::from_v8(self.scope, self.input)?)
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}
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DetachedBuffer::MAGIC_NAME => {
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visit_magic(visitor, DetachedBuffer::from_v8(self.scope, self.input)?)
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}
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ByteString::MAGIC_NAME => {
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visit_magic(visitor, ByteString::from_v8(self.scope, self.input)?)
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}
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U16String::MAGIC_NAME => {
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visit_magic(visitor, U16String::from_v8(self.scope, self.input)?)
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}
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StringOrBuffer::MAGIC_NAME => {
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visit_magic(visitor, StringOrBuffer::from_v8(self.scope, self.input)?)
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}
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magic::Value::MAGIC_NAME => {
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visit_magic(visitor, magic::Value::from_v8(self.scope, self.input)?)
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}
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_ => {
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// Regular struct
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let obj = self.input.try_into().or(Err(Error::ExpectedObject))?;
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visitor.visit_seq(StructAccess {
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fields,
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obj,
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pos: 0,
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scope: self.scope,
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_cache: None,
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})
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}
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}
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}
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/// To be compatible with `serde-json`, we expect enums to be:
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/// - `"Variant"`: strings for unit variants, i.e: Enum::Variant
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/// - `{ Variant: payload }`: single K/V pairs, converted to `Enum::Variant { payload }`
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fn deserialize_enum<V>(
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self,
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_name: &str,
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_variants: &'static [&'static str],
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visitor: V,
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) -> Result<V::Value>
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where
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V: Visitor<'de>,
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{
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// Unit variant
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if self.input.is_string() || self.input.is_string_object() {
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let payload = v8::undefined(self.scope).into();
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visitor.visit_enum(EnumAccess {
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scope: self.scope,
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tag: self.input,
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payload,
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})
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}
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// Struct or tuple variant
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else if self.input.is_object() {
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// Assume object
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let obj = v8::Local::<v8::Object>::try_from(self.input).unwrap();
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// Unpack single-key
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let tag = {
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let prop_names = obj.get_own_property_names(self.scope);
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let prop_names = prop_names.ok_or(Error::ExpectedEnum)?;
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if prop_names.length() != 1 {
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return Err(Error::LengthMismatch);
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}
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prop_names.get_index(self.scope, 0).unwrap()
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};
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let payload = obj.get(self.scope, tag).unwrap();
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visitor.visit_enum(EnumAccess {
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scope: self.scope,
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tag,
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payload,
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})
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} else {
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// TODO: improve error
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Err(Error::ExpectedEnum)
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}
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}
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// An identifier in Serde is the type that identifies a field of a struct or
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// the variant of an enum. In JSON, struct fields and enum variants are
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// represented as strings. In other formats they may be represented as
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// numeric indices.
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fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value>
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where
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V: Visitor<'de>,
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{
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self.deserialize_str(visitor)
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}
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fn deserialize_ignored_any<V>(self, visitor: V) -> Result<V::Value>
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where
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V: Visitor<'de>,
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{
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visitor.visit_none()
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}
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fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value>
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where
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V: Visitor<'de>,
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{
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magic::buffer::ZeroCopyBuf::from_v8(self.scope, self.input)
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.and_then(|zb| visitor.visit_bytes(&*zb))
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}
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fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value>
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where
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V: Visitor<'de>,
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{
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magic::buffer::ZeroCopyBuf::from_v8(self.scope, self.input)
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.and_then(|zb| visitor.visit_byte_buf(Vec::from(&*zb)))
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}
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}
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struct MapObjectAccess<'a, 's> {
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obj: v8::Local<'a, v8::Object>,
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scope: &'a mut v8::HandleScope<'s>,
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keys: std::vec::IntoIter<magic::Value<'a>>,
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next_value: Option<v8::Local<'a, v8::Value>>,
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}
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impl<'de> de::MapAccess<'de> for MapObjectAccess<'_, '_> {
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type Error = Error;
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fn next_key_seed<K: de::DeserializeSeed<'de>>(
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&mut self,
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seed: K,
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) -> Result<Option<K::Value>> {
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for key in self.keys.by_ref() {
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let v8_val = self.obj.get(self.scope, key.v8_value).unwrap();
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if v8_val.is_undefined() {
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// Historically keys/value pairs with undefined values are not added to the output
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continue;
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}
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self.next_value = Some(v8_val);
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let mut deserializer = Deserializer::new(self.scope, key.v8_value, None);
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let k = seed.deserialize(&mut deserializer)?;
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return Ok(Some(k));
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}
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Ok(None)
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}
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fn next_value_seed<V: de::DeserializeSeed<'de>>(
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&mut self,
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seed: V,
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) -> Result<V::Value> {
|
|
let v8_val = self.next_value.take().unwrap();
|
|
let mut deserializer = Deserializer::new(self.scope, v8_val, None);
|
|
seed.deserialize(&mut deserializer)
|
|
}
|
|
|
|
fn size_hint(&self) -> Option<usize> {
|
|
Some(self.keys.len())
|
|
}
|
|
}
|
|
|
|
struct MapPairsAccess<'a, 's> {
|
|
obj: v8::Local<'a, v8::Array>,
|
|
pos: u32,
|
|
len: u32,
|
|
scope: &'a mut v8::HandleScope<'s>,
|
|
}
|
|
|
|
impl<'de> de::MapAccess<'de> for MapPairsAccess<'_, '_> {
|
|
type Error = Error;
|
|
|
|
fn next_key_seed<K: de::DeserializeSeed<'de>>(
|
|
&mut self,
|
|
seed: K,
|
|
) -> Result<Option<K::Value>> {
|
|
if self.pos < self.len {
|
|
let v8_key = self.obj.get_index(self.scope, self.pos).unwrap();
|
|
self.pos += 1;
|
|
let mut deserializer = Deserializer::new(self.scope, v8_key, None);
|
|
let k = seed.deserialize(&mut deserializer)?;
|
|
Ok(Some(k))
|
|
} else {
|
|
Ok(None)
|
|
}
|
|
}
|
|
|
|
fn next_value_seed<V: de::DeserializeSeed<'de>>(
|
|
&mut self,
|
|
seed: V,
|
|
) -> Result<V::Value> {
|
|
debug_assert!(self.pos < self.len);
|
|
let v8_val = self.obj.get_index(self.scope, self.pos).unwrap();
|
|
self.pos += 1;
|
|
let mut deserializer = Deserializer::new(self.scope, v8_val, None);
|
|
seed.deserialize(&mut deserializer)
|
|
}
|
|
|
|
fn size_hint(&self) -> Option<usize> {
|
|
Some((self.len - self.pos) as usize / 2)
|
|
}
|
|
}
|
|
|
|
struct StructAccess<'a, 'b, 's> {
|
|
obj: v8::Local<'a, v8::Object>,
|
|
scope: &'b mut v8::HandleScope<'s>,
|
|
fields: &'static [&'static str],
|
|
pos: usize,
|
|
_cache: Option<&'b mut KeyCache>,
|
|
}
|
|
|
|
impl<'de> de::SeqAccess<'de> for StructAccess<'_, '_, '_> {
|
|
type Error = Error;
|
|
|
|
fn next_element_seed<T: de::DeserializeSeed<'de>>(
|
|
&mut self,
|
|
seed: T,
|
|
) -> Result<Option<T::Value>> {
|
|
if self.pos >= self.fields.len() {
|
|
return Ok(None);
|
|
}
|
|
|
|
let pos = self.pos;
|
|
self.pos += 1;
|
|
|
|
let field = self.fields[pos];
|
|
let key = v8_struct_key(self.scope, field).into();
|
|
let val = self.obj.get(self.scope, key).unwrap();
|
|
let mut deserializer = Deserializer::new(self.scope, val, None);
|
|
match seed.deserialize(&mut deserializer) {
|
|
Ok(val) => Ok(Some(val)),
|
|
// Fallback to Ok(None) for #[serde(Default)] at cost of error quality ...
|
|
// TODO(@AaronO): double check that there's no better solution
|
|
Err(_) if val.is_undefined() => Ok(None),
|
|
Err(e) => Err(e),
|
|
}
|
|
}
|
|
}
|
|
|
|
struct SeqAccess<'a, 'b, 's> {
|
|
obj: v8::Local<'a, v8::Object>,
|
|
scope: &'b mut v8::HandleScope<'s>,
|
|
len: u32,
|
|
pos: u32,
|
|
}
|
|
|
|
impl<'de> de::SeqAccess<'de> for SeqAccess<'_, '_, '_> {
|
|
type Error = Error;
|
|
|
|
fn next_element_seed<T: de::DeserializeSeed<'de>>(
|
|
&mut self,
|
|
seed: T,
|
|
) -> Result<Option<T::Value>> {
|
|
let pos = self.pos;
|
|
self.pos += 1;
|
|
|
|
if pos < self.len {
|
|
let val = self.obj.get_index(self.scope, pos).unwrap();
|
|
let mut deserializer = Deserializer::new(self.scope, val, None);
|
|
Ok(Some(seed.deserialize(&mut deserializer)?))
|
|
} else {
|
|
Ok(None)
|
|
}
|
|
}
|
|
|
|
fn size_hint(&self) -> Option<usize> {
|
|
Some((self.len - self.pos) as usize)
|
|
}
|
|
}
|
|
|
|
struct EnumAccess<'a, 'b, 's> {
|
|
tag: v8::Local<'a, v8::Value>,
|
|
payload: v8::Local<'a, v8::Value>,
|
|
scope: &'b mut v8::HandleScope<'s>,
|
|
// p1: std::marker::PhantomData<&'x ()>,
|
|
}
|
|
|
|
impl<'de, 'a, 'b, 's> de::EnumAccess<'de> for EnumAccess<'a, 'b, 's> {
|
|
type Error = Error;
|
|
type Variant = VariantDeserializer<'a, 'b, 's>;
|
|
|
|
fn variant_seed<V: de::DeserializeSeed<'de>>(
|
|
self,
|
|
seed: V,
|
|
) -> Result<(V::Value, Self::Variant)> {
|
|
let seed = {
|
|
let mut dtag = Deserializer::new(self.scope, self.tag, None);
|
|
seed.deserialize(&mut dtag)
|
|
};
|
|
let dpayload = VariantDeserializer::<'a, 'b, 's> {
|
|
scope: self.scope,
|
|
value: self.payload,
|
|
};
|
|
|
|
Ok((seed?, dpayload))
|
|
}
|
|
}
|
|
|
|
struct VariantDeserializer<'a, 'b, 's> {
|
|
value: v8::Local<'a, v8::Value>,
|
|
scope: &'b mut v8::HandleScope<'s>,
|
|
}
|
|
|
|
impl<'de, 'a, 'b, 's> de::VariantAccess<'de>
|
|
for VariantDeserializer<'a, 'b, 's>
|
|
{
|
|
type Error = Error;
|
|
|
|
fn unit_variant(self) -> Result<()> {
|
|
let mut d = Deserializer::new(self.scope, self.value, None);
|
|
de::Deserialize::deserialize(&mut d)
|
|
}
|
|
|
|
fn newtype_variant_seed<T: de::DeserializeSeed<'de>>(
|
|
self,
|
|
seed: T,
|
|
) -> Result<T::Value> {
|
|
let mut d = Deserializer::new(self.scope, self.value, None);
|
|
seed.deserialize(&mut d)
|
|
}
|
|
|
|
fn tuple_variant<V: de::Visitor<'de>>(
|
|
self,
|
|
len: usize,
|
|
visitor: V,
|
|
) -> Result<V::Value> {
|
|
let mut d = Deserializer::new(self.scope, self.value, None);
|
|
de::Deserializer::deserialize_tuple(&mut d, len, visitor)
|
|
}
|
|
|
|
fn struct_variant<V: de::Visitor<'de>>(
|
|
self,
|
|
fields: &'static [&'static str],
|
|
visitor: V,
|
|
) -> Result<V::Value> {
|
|
let mut d = Deserializer::new(self.scope, self.value, None);
|
|
de::Deserializer::deserialize_struct(&mut d, "", fields, visitor)
|
|
}
|
|
}
|
|
|
|
fn bigint_to_f64(b: v8::Local<v8::BigInt>) -> f64 {
|
|
// log2(f64::MAX) == log2(1.7976931348623157e+308) == 1024
|
|
let mut words: [u64; 16] = [0; 16]; // 1024/64 => 16 64bit words
|
|
let (neg, words) = b.to_words_array(&mut words);
|
|
if b.word_count() > 16 {
|
|
return match neg {
|
|
true => f64::NEG_INFINITY,
|
|
false => f64::INFINITY,
|
|
};
|
|
}
|
|
let sign = if neg { -1.0 } else { 1.0 };
|
|
let x: f64 = words
|
|
.iter()
|
|
.enumerate()
|
|
.map(|(i, w)| (*w as f64) * 2.0f64.powi(64 * i as i32))
|
|
.sum();
|
|
sign * x
|
|
}
|
|
|
|
pub fn to_utf8(
|
|
s: v8::Local<v8::String>,
|
|
scope: &mut v8::HandleScope,
|
|
) -> String {
|
|
to_utf8_fast(s, scope).unwrap_or_else(|| to_utf8_slow(s, scope))
|
|
}
|
|
|
|
fn to_utf8_fast(
|
|
s: v8::Local<v8::String>,
|
|
scope: &mut v8::HandleScope,
|
|
) -> Option<String> {
|
|
// Over-allocate by 20% to avoid checking string twice
|
|
let len = s.length();
|
|
let capacity = (len as f64 * 1.2) as usize;
|
|
let mut buf = Vec::with_capacity(capacity);
|
|
let mut nchars = 0;
|
|
let data = buf.as_mut_ptr();
|
|
let length = s.write_utf8(
|
|
scope,
|
|
// SAFETY: we're essentially providing the raw internal slice/buffer owned by the Vec
|
|
// which fulfills all of from_raw_parts_mut's safety requirements besides "initialization"
|
|
// and since we're operating on a [u8] not [T] we can safely assume the slice's values
|
|
// are sufficiently "initialized" for writes
|
|
unsafe { std::slice::from_raw_parts_mut(data, capacity) },
|
|
Some(&mut nchars),
|
|
v8::WriteOptions::NO_NULL_TERMINATION
|
|
| v8::WriteOptions::REPLACE_INVALID_UTF8,
|
|
);
|
|
if nchars < len {
|
|
return None;
|
|
}
|
|
// SAFETY: write_utf8 guarantees `length` bytes are initialized & valid utf8
|
|
unsafe {
|
|
buf.set_len(length);
|
|
Some(String::from_utf8_unchecked(buf))
|
|
}
|
|
}
|
|
|
|
fn to_utf8_slow(
|
|
s: v8::Local<v8::String>,
|
|
scope: &mut v8::HandleScope,
|
|
) -> String {
|
|
let capacity = s.utf8_length(scope);
|
|
let mut buf = Vec::with_capacity(capacity);
|
|
let data = buf.as_mut_ptr();
|
|
let length = s.write_utf8(
|
|
scope,
|
|
// SAFETY: we're essentially providing the raw internal slice/buffer owned by the Vec
|
|
// which fulfills all of from_raw_parts_mut's safety requirements besides "initialization"
|
|
// and since we're operating on a [u8] not [T] we can safely assume the slice's values
|
|
// are sufficiently "initialized" for writes
|
|
unsafe { std::slice::from_raw_parts_mut(data, capacity) },
|
|
None,
|
|
v8::WriteOptions::NO_NULL_TERMINATION
|
|
| v8::WriteOptions::REPLACE_INVALID_UTF8,
|
|
);
|
|
// SAFETY: write_utf8 guarantees `length` bytes are initialized & valid utf8
|
|
unsafe {
|
|
buf.set_len(length);
|
|
String::from_utf8_unchecked(buf)
|
|
}
|
|
}
|