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use shapely::{Shape, ShapeDesc};
use std::io::{self, Write};
/// Serializes any Shapely type to JSON
pub fn to_json<W: Write>(
data: *mut u8,
shape_desc: ShapeDesc,
writer: &mut W,
indent: bool,
) -> io::Result<()> {
use shapely::{Innards, Scalar};
fn serialize_value<W: Write>(
data: *const u8,
shape: Shape,
writer: &mut W,
indent: bool,
level: usize,
) -> io::Result<()> {
match &shape.innards {
Innards::Scalar(scalar) => match scalar {
Scalar::String => {
let s = unsafe { &*(data as *const String) };
write!(writer, "\"{}\"", s.replace('"', "\\\""))
}
Scalar::Bytes => Err(io::Error::new(
io::ErrorKind::InvalidData,
"cowardly refusing to inject binary data straight into your JSON",
)),
Scalar::I8 => {
let value = unsafe { *(data as *const i8) };
write!(writer, "{value}")
}
Scalar::I16 => {
let value = unsafe { *(data as *const i16) };
write!(writer, "{value}")
}
Scalar::I32 => {
let value = unsafe { *(data as *const i32) };
write!(writer, "{value}")
}
Scalar::I64 => {
let value = unsafe { *(data as *const i64) };
write!(writer, "{value}")
}
Scalar::I128 => {
let value = unsafe { *(data as *const i128) };
write!(writer, "{value}")
}
Scalar::U8 => {
let value = unsafe { *data };
write!(writer, "{value}")
}
Scalar::U16 => {
let value = unsafe { *(data as *const u16) };
write!(writer, "{value}")
}
Scalar::U32 => {
let value = unsafe { *(data as *const u32) };
write!(writer, "{value}")
}
Scalar::U64 => {
let value = unsafe { *(data as *const u64) };
write!(writer, "{value}")
}
Scalar::U128 => {
let value = unsafe { *(data as *const u128) };
write!(writer, "{value}")
}
Scalar::F32 => {
let value = unsafe { *(data as *const f32) };
write!(writer, "{value}")
}
Scalar::F64 => {
let value = unsafe { *(data as *const f64) };
write!(writer, "{value}")
}
Scalar::Boolean => {
let value = unsafe { *(data as *const bool) };
write!(writer, "{}", if value { "true" } else { "false" })
}
Scalar::Nothing => {
write!(writer, "null")
}
_ => Err(io::Error::new(
io::ErrorKind::InvalidData,
"unsupported scalar type encountered",
)),
},
Innards::Struct { fields } => {
write!(writer, "{{")?;
if indent {
writeln!(writer)?;
}
for (i, field) in fields.iter().enumerate() {
if indent {
write!(writer, "{:indent$}", "", indent = (level + 1) * 2)?;
}
write!(writer, "\"{}\":", field.name)?;
if indent {
write!(writer, " ")?;
}
let field_data = unsafe { data.add(field.offset) };
serialize_value(field_data, field.shape.get(), writer, indent, level + 1)?;
if i < fields.len() - 1 {
write!(writer, ",")?;
}
if indent {
writeln!(writer)?;
}
}
if indent {
write!(writer, "{:indent$}", "", indent = level * 2)?;
}
write!(writer, "}}")
}
Innards::List { vtable, item_shape } => {
write!(writer, "[")?;
if indent {
writeln!(writer)?;
}
unsafe {
let len = (vtable.len)(data);
for i in 0..len {
if indent {
write!(writer, "{:indent$}", "", indent = (level + 1) * 2)?;
}
let item_ptr = (vtable.get_item_ptr)(data, i);
serialize_value(item_ptr, item_shape.get(), writer, indent, level + 1)?;
if i < len - 1 {
write!(writer, ",")?;
}
if indent {
writeln!(writer)?;
}
}
if indent && len > 0 {
write!(writer, "{:indent$}", "", indent = level * 2)?;
}
}
write!(writer, "]")
}
Innards::Map {
vtable,
value_shape,
} => {
write!(writer, "{{")?;
if indent {
writeln!(writer)?;
}
unsafe {
// Get an iterator over the HashMap
let iter_ptr = (vtable.iter)(data);
// Keep track of whether we need to write a comma
let mut first = true;
// Iterate over the key-value pairs
while let Some((key_ptr, value_ptr)) = (vtable.iter_vtable.next)(iter_ptr) {
if !first {
write!(writer, ",")?;
if indent {
writeln!(writer)?;
}
}
first = false;
if indent {
write!(writer, "{:indent$}", "", indent = (level + 1) * 2)?;
}
// Serialize the key as a string
let key = &(*key_ptr);
write!(writer, "\"{}\":", key.replace('"', "\\\""))?;
if indent {
write!(writer, " ")?;
}
// Serialize the value
serialize_value(value_ptr, value_shape.get(), writer, indent, level + 1)?;
}
// Deallocate the iterator
(vtable.iter_vtable.dealloc)(iter_ptr);
if !first && indent {
writeln!(writer)?;
write!(writer, "{:indent$}", "", indent = level * 2)?;
}
}
write!(writer, "}}")
}
// Add support for other shapes (Array, Transparent) as needed
_ => write!(writer, "null"),
}
}
serialize_value(data, shape_desc.get(), writer, indent, 0)
}
/// Serializes any Shapely type to JSON and returns it as a String
pub fn to_json_string(data: *mut u8, shape_desc: ShapeDesc, indent: bool) -> String {
let mut buffer = Vec::new();
to_json(data, shape_desc, &mut buffer, indent).unwrap();
String::from_utf8(buffer).unwrap()
}