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use crate::{constants::*, error::Error, *};
use quick_xml::{events::*, Writer};
use serde_json::Value;
use std::io::Cursor;
fn is_attribute_property_name(name: &str) -> bool {
name.find(ATTRIBUTE_START_CHARACTER) == Some(0)
}
fn is_decl(name: &str) -> bool {
name == DECL_STRING
}
fn write_value(writer: &mut Writer<Cursor<Vec<u8>>>, value: Value) -> Result<(), Error> {
match value {
Value::Null => return Err(Error::JsonParseUnexpectedNull),
Value::Bool(_) => return Err(Error::JsonParseUnexpectedBool),
Value::Number(_) => return Err(Error::JsonParseUnexpectedNumber),
Value::String(string) => {
writer
.write_event(Event::Text(BytesText::from_plain_str(&string)))
.map_err(|e| Error::XmlQuickXmlError(e))?;
}
Value::Array(_) => return Err(Error::JsonParseUnexpectedArray),
Value::Object(map) => {
for (key, value) in map {
if is_attribute_property_name(&key) {
continue;
}
if is_decl(&key) {
writer
.write_event(Event::Decl(BytesDecl::new(
value
.get("version")
.ok_or(Error::JsonParseDeclMissingVersion)?
.as_str()
.ok_or(Error::JsonParseInvalidDecl)?
.as_bytes(),
match value.get("encoding") {
Some(v) => {
Some(v.as_str().ok_or(Error::JsonParseInvalidDecl)?.as_bytes())
}
None => None,
},
match value.get("standalone") {
Some(v) => {
Some(v.as_str().ok_or(Error::JsonParseInvalidDecl)?.as_bytes())
}
None => None,
},
)))
.map_err(|e| Error::XmlQuickXmlError(e))?;
continue;
}
match value {
Value::String(_) => write_value(writer, value)?,
Value::Array(values) => {
for value in values {
let has_children = match &value {
Value::Null
| Value::Bool(_)
| Value::Number(_)
| Value::String(_) => false,
Value::Array(array) => array.is_empty(),
Value::Object(object) => object
.iter()
.find(|(key, _)| !is_attribute_property_name(key))
.is_some(),
};
let mut bytes_start = BytesStart::borrowed(key.as_bytes(), key.len());
match &value {
Value::Object(object) => {
for (key, value) in object.iter() {
if is_attribute_property_name(key) {
bytes_start.push_attribute((
key.get(1..)
.ok_or(Error::JsonParseInvalidAttributeName)?,
match value {
Value::String(string) => string,
_ => {
return Err(
Error::JsonParseInvalidAttributeValue,
)
}
}
.as_str(),
));
}
}
}
_ => return Err(Error::JsonParseExpectedObject),
}
if !has_children {
writer
.write_event(Event::Empty(bytes_start))
.map_err(|e| Error::XmlQuickXmlError(e))?;
} else {
writer
.write_event(Event::Start(bytes_start))
.map_err(|e| Error::XmlQuickXmlError(e))?;
write_value(writer, value)?;
writer
.write_event(Event::End(BytesEnd::borrowed(key.as_bytes())))
.map_err(|e| Error::XmlQuickXmlError(e))?;
}
}
}
_ => return Err(Error::JsonParseExpectedArray),
}
}
}
}
Ok(())
}
pub fn json_to_xml(json: &str, indent: Option<(u8, usize)>) -> Result<String, Error> {
let mut writer = match indent {
None => Writer::new(Cursor::new(Vec::new())),
Some((c, size)) => Writer::new_with_indent(Cursor::new(vec![]), c, size),
};
write_value(
&mut writer,
serde_json::from_str(json).map_err(|e| Error::JsonParseError(e))?,
)?;
bytes_to_string(&writer.into_inner().into_inner())
}
