mirror of
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88 lines
2.3 KiB
Rust
88 lines
2.3 KiB
Rust
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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use super::buffer::ZeroCopyBuf;
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use super::transl8::FromV8;
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use super::transl8::ToV8;
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use crate::error::value_to_type_str;
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use crate::magic::transl8::impl_magic;
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use crate::Error;
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use std::ops::Deref;
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#[derive(Debug)]
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pub enum StringOrBuffer {
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Buffer(ZeroCopyBuf),
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String(String),
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}
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impl_magic!(StringOrBuffer);
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impl Deref for StringOrBuffer {
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type Target = [u8];
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fn deref(&self) -> &Self::Target {
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match self {
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Self::Buffer(b) => b.as_ref(),
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Self::String(s) => s.as_bytes(),
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}
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}
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}
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impl<'a> TryFrom<&'a StringOrBuffer> for &'a str {
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type Error = std::str::Utf8Error;
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fn try_from(value: &'a StringOrBuffer) -> Result<Self, Self::Error> {
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match value {
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StringOrBuffer::String(s) => Ok(s.as_str()),
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StringOrBuffer::Buffer(b) => std::str::from_utf8(b.as_ref()),
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}
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}
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}
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impl ToV8 for StringOrBuffer {
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fn to_v8<'a>(
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&mut self,
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scope: &mut v8::HandleScope<'a>,
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) -> Result<v8::Local<'a, v8::Value>, crate::Error> {
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match self {
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Self::Buffer(buf) => {
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let buf: Box<[u8]> = match buf {
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ZeroCopyBuf::FromV8(buf) => {
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let value: &[u8] = buf;
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value.into()
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}
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ZeroCopyBuf::Temp(_) => unreachable!(),
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ZeroCopyBuf::ToV8(ref mut x) => {
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x.take().expect("ZeroCopyBuf was empty")
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}
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};
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let backing_store =
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v8::ArrayBuffer::new_backing_store_from_boxed_slice(buf);
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Ok(
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v8::ArrayBuffer::with_backing_store(scope, &backing_store.into())
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.into(),
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)
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}
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Self::String(s) => crate::to_v8(scope, s),
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}
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}
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}
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impl FromV8 for StringOrBuffer {
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fn from_v8(
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scope: &mut v8::HandleScope,
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value: v8::Local<v8::Value>,
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) -> Result<Self, crate::Error> {
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if let Ok(buf) = ZeroCopyBuf::from_v8(scope, value) {
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return Ok(Self::Buffer(buf));
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} else if let Ok(s) = crate::from_v8(scope, value) {
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return Ok(Self::String(s));
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}
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Err(Error::ExpectedBuffer(value_to_type_str(value)))
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}
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}
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impl From<StringOrBuffer> for bytes::Bytes {
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fn from(sob: StringOrBuffer) -> Self {
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match sob {
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StringOrBuffer::Buffer(b) => b.into(),
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StringOrBuffer::String(s) => s.into_bytes().into(),
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}
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}
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}
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