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//! Intrinsics that represent helpers perform conversions
use std::fmt::Write;
use crate::intrinsics::Intrinsic;
use crate::source::Source;
use crate::uwriteln;
/// This enum contains intrinsics that help perform type conversions
#[derive(Debug, Copy, Clone, Ord, PartialOrd, Eq, PartialEq)]
pub enum ConversionIntrinsic {
I32ToF32,
I64ToF64,
F32ToI32,
F64ToI64,
/// Convert a i32 to a char
I32ToChar,
/// Implementation of <https://tc39.es/ecma262/#sec-tobigint64>
ToBigInt64,
/// Implementation of <https://tc39.es/ecma262/#sec-tobiguint64>
ToBigUint64,
/// Implementation of <https://tc39.es/ecma262/#sec-toint16>
ToInt16,
/// Implementation of <https://tc39.es/ecma262/#sec-toint32>
ToInt32,
/// Implementation of <https://tc39.es/ecma262/#sec-toint8>
ToInt8,
/// Implementation of <https://tc39.es/ecma262/#sec-tostring>
ToString,
/// Implementation of <https://tc39.es/ecma262/#sec-touint16>
ToUint16,
/// Implementation of <https://tc39.es/ecma262/#sec-touint32>
ToUint32,
/// Implementation of <https://tc39.es/ecma262/#sec-touint8>
ToUint8,
ToResultString,
/// Function that requires validity of various numeric primitive types (or throws a `TypeError`)
RequireValidNumericPrimitive,
/// Function that checks validity of various numeric primitive types
IsValidNumericPrimitive,
}
impl ConversionIntrinsic {
/// Retrieve dependencies for this intrinsic
pub fn deps() -> &'static [&'static Intrinsic] {
&[]
}
/// Retrieve global names for
pub fn get_global_names() -> impl IntoIterator<Item = &'static str> {
[
"f32ToI32",
"f64ToI64",
"i32ToChar",
"i32ToF32",
"i64ToF64",
"toInt16",
"toInt32",
"toInt64",
"toInt8",
"toResultString",
"toString",
"toUint16",
"toUint32",
"toUint64",
"toUint64",
"toUint8",
Self::RequireValidNumericPrimitive.name(),
Self::IsValidNumericPrimitive.name(),
]
}
/// Get the name for the intrinsic
pub fn name(&self) -> &'static str {
match self {
Self::ToBigInt64 => "toInt64",
Self::I32ToChar => "i32ToChar",
Self::ToBigUint64 => "toUint64",
Self::ToInt16 => "toInt16",
Self::ToInt32 => "toInt32",
Self::ToInt8 => "toInt8",
Self::ToResultString => "toResultString",
Self::ToString => "toString",
Self::ToUint16 => "toUint16",
Self::ToUint32 => "toUint32",
Self::ToUint8 => "toUint8",
Self::I32ToF32 => "i32ToF32",
Self::I64ToF64 => "i64ToF64",
Self::F32ToI32 => "f32ToI32",
Self::F64ToI64 => "f64ToI64",
Self::RequireValidNumericPrimitive => "_requireValidNumericPrimitive",
Self::IsValidNumericPrimitive => "_isValidNumericPrimitive",
}
}
/// Render an intrinsic to a string
pub fn render(&self, output: &mut Source) {
match self {
Self::I32ToF32 => output.push_str(
"
const i32ToF32 = i => (i32ToF32I[0] = i, i32ToF32F[0]);
",
),
Self::F32ToI32 => output.push_str(
"
const f32ToI32 = f => (i32ToF32F[0] = f, i32ToF32I[0]);
",
),
Self::I64ToF64 => output.push_str(
"
const i64ToF64 = i => (i64ToF64I[0] = i, i64ToF64F[0]);
",
),
Self::F64ToI64 => output.push_str("
const f64ToI64 = f => (i64ToF64F[0] = f, i64ToF64I[0]);
"),
Self::ToBigInt64 => {
let ensure_valid_numeric_primitive_fn = Self::RequireValidNumericPrimitive.name();
uwriteln!(
output,
r#"
function toInt64(val) {{
const converted = BigInt(val)
{ensure_valid_numeric_primitive_fn}('s64', converted);
return BigInt.asIntN(64, converted);
}}
"#
)
},
Self::ToBigUint64 => {
let ensure_valid_numeric_primitive_fn = Self::RequireValidNumericPrimitive.name();
uwriteln!(
output,
r#"
function toUint64(val) {{
const converted = BigInt(val)
{ensure_valid_numeric_primitive_fn}('u64', converted);
return BigInt.asUintN(64, converted);
}}
"#
);
},
Self::ToInt16 => {
let ensure_valid_numeric_primitive_fn = Self::RequireValidNumericPrimitive.name();
uwriteln!(
output,
r#"
function toInt16(val) {{
{ensure_valid_numeric_primitive_fn}('s16', val);
val >>>= 0;
val %= 2 ** 16;
if (val >= 2 ** 15) {{
val -= 2 ** 16;
}}
return val;
}}
"#
);
},
Self::ToUint16 => {
let ensure_valid_numeric_primitive_fn = Self::RequireValidNumericPrimitive.name();
uwriteln!(
output,
r#"
function toUint16(val) {{
{ensure_valid_numeric_primitive_fn}('u16', val);
val >>>= 0;
val %= 2 ** 16;
return val;
}}
"#
)
},
Self::ToInt32 => {
let ensure_valid_numeric_primitive_fn = Self::RequireValidNumericPrimitive.name();
uwriteln!(
output,
r#"
function toInt32(val) {{
{ensure_valid_numeric_primitive_fn}('s32', val);
return val >> 0;
}}
"#
);
},
Self::ToInt8 => {
let ensure_valid_numeric_primitive_fn = Self::RequireValidNumericPrimitive.name();
uwriteln!(
output,
r#"
function toInt8(val) {{
{ensure_valid_numeric_primitive_fn}('s8', val);
val >>>= 0;
val %= 2 ** 8;
if (val >= 2 ** 7) {{
val -= 2 ** 8;
}}
return val;
}}
"#
);
},
Self::ToResultString => output.push_str("
function toResultString(obj) {
return JSON.stringify(obj, (_, v) => {
if (v && Object.getPrototypeOf(v) === Uint8Array.prototype) {
return `[${v[Symbol.toStringTag]} (${v.byteLength})]`;
} else if (typeof v === 'bigint') {
return v.toString();
}
return v;
});
}
"),
Self::ToString => output.push_str("
function toString(val) {
if (typeof val === 'symbol') throw new TypeError('symbols cannot be converted to strings');
return String(val);
}
"),
Self::ToUint32 => {
let ensure_valid_numeric_primitive_fn = Self::RequireValidNumericPrimitive.name();
uwriteln!(
output,
r#"
function toUint32(val) {{
{ensure_valid_numeric_primitive_fn}('u32', val);
return val >>> 0;
}}
"#
)
},
Self::ToUint8 => {
let ensure_valid_numeric_primitive_fn = Self::RequireValidNumericPrimitive.name();
uwriteln!(
output,
r#"
function toUint8(val) {{
{ensure_valid_numeric_primitive_fn}('u8', val);
val >>>= 0;
val %= 2 ** 8;
return val;
}}
"#
);
},
Self::I32ToChar => {
output.push_str("
function i32ToChar(n) {
if (!n || typeof n !== 'number') { throw new Error('invalid i32'); }
if (n < 0) { throw new Error('i32 must be greater than zero'); }
if (n >= 0x110000) { throw new Error('invalid i32, out of range'); }
if (0xD800 <= n && n <= 0xDFFF) { throw new Error('invalid i32 out of range'); }
return String.fromCharCode(n);
}
");
}
Self::RequireValidNumericPrimitive => {
let name = self.name();
let is_valid_numeric_primitive_fn = Self::IsValidNumericPrimitive.name();
output.push_str(&format!(r#"
function {name}(ty, v) {{
if (v === undefined || v === null || !{is_valid_numeric_primitive_fn}(ty, v)) {{
throw new TypeError(`invalid ${{ty}} value [${{v}}]`);
}}
return true;
}}
"#))
}
Self::IsValidNumericPrimitive => {
let name = self.name();
output.push_str(&format!(r#"
function {name}(ty, v) {{
if (v === undefined || v === null) {{ return false; }}
switch (ty) {{
case 'bool':
return v === 0 || v === 1;
break;
case 'u8':
return v >= 0 && v <= 255;
break;
case 's8':
return v >= -128 && v <= 127;
break;
case 'u16':
return v >= 0 && v <= 65535;
break;
case 's16':
return v >= -32768 && v <= 32767;
case 'u32':
return v >= 0 && v <= 4_294_967_295;
case 's32':
return v >= -2_147_483_648 && v <= 2_147_483_647;
case 'u64':
return typeof v === 'bigint' && v >= 0 && v <= 18_446_744_073_709_551_615n;
case 's64':
return typeof v === 'bigint' && v >= -9223372036854775808n && v <= 9223372036854775807n;
break;
case 'f32':
case 'f64': return typeof v === 'number';
default:
return false;
}}
return true;
}}
"#
));
}
}
}
}