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use super::Interpreter;
use crate::{
error::E,
interpreter::Offset,
nature::{Composite, Nature, Natures, Referred},
};
use std::{
fs::File,
io::{BufWriter, Write},
ops::Deref,
};
fn wrap_output(call_exp: String, result_as_json: bool) -> String {
format!(
"{}{call_exp}{}",
if result_as_json { "JSON.parse(" } else { "" },
if result_as_json { ")" } else { "" }
)
}
fn wrap_err(error_as_json: bool, asyncness: bool, exception_suppression: bool) -> String {
let open = if asyncness { "Promise.reject(" } else { "" };
let close = if asyncness { ")" } else { "" };
let returning = if exception_suppression || asyncness {
"return"
} else {
"throw"
};
let parsing_err_block = if exception_suppression || asyncness {
format!("try {{
const err = new Error(`Function/method returns error;`);
err.err = JSON.parse(e);
return {open}err{close};
}} catch(err_parsing) {{
return {open}new Error(`Function/method returns error; fail to parse error; origin error: ${{e}}; error: ${{err_parsing}}`){close};
}}")
} else {
"const err = new Error(`Function/method returns error;`);
try {{
err.err = JSON.parse(e);
}} catch(err_parsing) {{
throw new Error(`Function/method returns error; fail to parse error; origin error: ${{e}}; error: ${{err_parsing}}`);
}}
throw err;".to_string()
};
if error_as_json {
format!("if (e instanceof Error) {{
{returning} {open}e{close};
}}
if (typeof e === 'string') {{
{parsing_err_block}
}} else {{
const err = new Error(`Function/method returns error; property [err] = ${{typeof e === 'object' && e !== null ? JSON.stringify(e) : e}}`);
err.err = e;
{returning} {open}err{close};
}}")
} else {
format!("if (e instanceof Error) {{
{returning} {open}e{close};
}}
if (typeof e === 'string') {{
{returning} {open}new Error(e){close};
}} else {{
const err = new Error(`Function/method returns error; property [err] = ${{typeof e === 'object' && e !== null ? JSON.stringify(e) : e}}`);
err.err = e;
{returning} {open}err{close};
}}")
}
}
fn fn_body(
call_exp: String,
exception_suppression: bool,
result_as_json: bool,
error_as_json: bool,
asyncness: bool,
) -> String {
let error_handeling_block = wrap_err(error_as_json, asyncness, exception_suppression);
if asyncness {
format!(
"return {call_exp}.then((result) => {{
try {{
return Promise.resolve({});
}} catch (e) {{
return Promise.reject(e);
}}
}}).catch((e) => {{
{error_handeling_block}
}});",
wrap_output("result".to_string(), result_as_json)
)
} else if exception_suppression || error_as_json {
format!(
"try {{
return {};
}} catch(e) {{
{error_handeling_block}
}}",
wrap_output(call_exp, result_as_json)
)
} else {
format!("return {};", wrap_output(call_exp, result_as_json))
}
}
impl Interpreter for Referred {
fn declaration(
&self,
_natures: &Natures,
buf: &mut BufWriter<File>,
offset: Offset,
) -> Result<(), E> {
match self {
Referred::Struct(struct_name, _, fields) => {
buf.write_all(
format!("\nconst {{ {struct_name} }} = nativeModuleRef;").as_bytes(),
)?;
if Natures::is_any_bound(fields) {
buf.write_all(format!("\nexports.{struct_name} = {struct_name};").as_bytes())?;
} else {
let alias = format!("$${struct_name}");
buf.write_all(
format!(
"\nclass {alias} {{
#_origin;"
)
.as_bytes(),
)?;
// Render fields
for field in fields.iter() {
if let Nature::Referred(Referred::Field(name, _, nature, _)) = field {
if !matches!(
nature.deref(),
Nature::Composite(Composite::Func(_, _, _, _, _))
) {
buf.write_all(
format!(
"\nget {name}() {{
return this.#_origin.{name};
}}
set {name}(v) {{
this.#_origin.{name} = v;
}}"
)
.as_bytes(),
)?;
}
}
}
// Render constructor
let mut constuctor_rendered = false;
for field in fields.iter() {
if let Nature::Referred(Referred::Field(_, context, nature, _)) = field {
if let Nature::Composite(Composite::Func(_, args, _, _, true)) =
&**nature
{
let bound = context.get_bound_args();
if bound.is_empty() {
let args = Natures::get_fn_args_names(args).join(", ");
buf.write_all(
format!(
"
constructor({args}) {{
this.#_origin = new {struct_name}({args});
}}"
)
.as_bytes(),
)?;
} else {
let args = Natures::get_fn_args_names(args);
buf.write_all(
format!(
"\n
constructor({}) {{
this.#_origin = new {struct_name}({});
}}",
args.join(", "),
args.iter()
.map(|a| {
if bound.iter().any(|(name, _)| name == a) {
format!("JSON.stringify({a})")
} else {
a.to_owned()
}
})
.collect::<Vec<String>>()
.join(", ")
)
.as_bytes(),
)?;
}
constuctor_rendered = true;
}
}
}
if !constuctor_rendered {
buf.write_all(
format!(
"\n
constructor() {{
this.#_origin = new {struct_name}();
}}"
)
.as_bytes(),
)?;
}
// Render methods
for field in fields.iter() {
if let Nature::Referred(Referred::Field(name, context, nature, _)) = field {
if let Nature::Composite(Composite::Func(
_,
args,
_,
asyncness,
constructor,
)) = nature.deref()
{
if *constructor {
continue;
}
let name = context.rename_field(name)?;
let bound = context.get_bound_args();
let args = Natures::get_fn_args_names(args);
let call_exp = if bound.is_empty() {
format!("this.#_origin.{name}({})", args.join(", "))
} else {
format!(
"this.#_origin.{name}({})",
args.iter()
.map(|a| {
if bound.iter().any(|(name, _)| name == a) {
format!("JSON.stringify({a})")
} else {
a.to_owned()
}
})
.collect::<Vec<String>>()
.join(", ")
)
};
buf.write_all(
format!(
"
{name}({}) {{
{}
}}",
args.join(", "),
fn_body(
call_exp,
context.exception_suppression()?,
context.result_as_json()?,
context.error_as_json()?,
*asyncness
)
)
.as_bytes(),
)?;
}
}
}
buf.write_all("\n}".as_bytes())?;
buf.write_all(format!("\nexports.{struct_name} = {alias};\n").as_bytes())?;
}
}
Referred::Enum(name, _context, variants, ..) => {
buf.write_all(format!("{offset}exports.{name} = Object.freeze({{\n",).as_bytes())?;
for (i, variant) in variants.iter().enumerate() {
if let Nature::Referred(Referred::EnumVariant(name, ..)) = variant {
buf.write_all(
format!(
"{}{name}: \"{name}\", {i}: \"{name}\", \"{i}\": \"{name}\",\n",
offset.inc()
)
.as_bytes(),
)?;
} else {
return Err(E::Parsing(String::from(
"Given nature isn't Enum's variant",
)));
}
}
buf.write_all(format!("{offset}}});\n",).as_bytes())?;
}
Referred::Func(fn_name, context, nature) => {
let fn_name = context.rename_method(fn_name)?;
let bound = context.get_bound_args();
let json_res = context.result_as_json()?;
buf.write_all(format!("\nconst {{ {fn_name} }} = nativeModuleRef;").as_bytes())?;
if bound.is_empty() && !json_res {
buf.write_all(format!("\nexports.{fn_name} = {fn_name};").as_bytes())?;
return Ok(());
}
let args = nature.get_fn_args_names()?;
let alias = format!("$${fn_name}");
let call_exp = if bound.is_empty() {
format!("{fn_name}({})", args.join(", "))
} else {
format!(
"{fn_name}({})",
args.iter()
.map(|a| {
if bound.iter().any(|(name, _)| name == a) {
format!("JSON.stringify({a})")
} else {
a.to_owned()
}
})
.collect::<Vec<String>>()
.join(", ")
)
};
let call_exp = if !context.result_as_json()? {
call_exp
} else {
format!("JSON.parse({call_exp})")
};
buf.write_all(
format!(
"
function {alias}({}) {{
{}
}}",
args.join(", "),
fn_body(
call_exp,
context.exception_suppression()?,
context.result_as_json()?,
context.error_as_json()?,
nature.is_fn_async()?,
)
)
.as_bytes(),
)?;
buf.write_all(format!("\nexports.{fn_name} = {alias};\n").as_bytes())?;
}
Referred::Constant(name, _context, _ty, value) => {
buf.write_all(format!("{offset}exports.{name} = {value};\n",).as_bytes())?;
}
_ => {
return Err(E::Parsing(
"Given nature cannot be declared for JS".to_string(),
));
}
}
Ok(())
}
}