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|
use std::io::{stdin, BufRead};
use crate::native::{self, NativeFunction, NativeFunctionResult};
use crate::value::{Object, ObjectType, Primitive};
use crate::VM;
fn write(vm: &mut VM, args: &[Primitive]) -> NativeFunctionResult {
let Some(Primitive::Object(ptr)) = args.get(0).cloned() else {
return Err(native::Error::InvalidArgument);
};
let object = vm
.objects()
.get(ptr as usize)
.ok_or(native::Error::InvalidArgument)?;
let ObjectType::String(str) = &object.typ else {
return Err(native::Error::InvalidArgument);
};
print!("{str}");
Ok(Primitive::Empty)
}
pub const WRITE_FUNCTION: NativeFunction = NativeFunction {
name: "write",
function: write,
arity: 1,
returns_value: false,
doc: Some(
"NativeFunction write: \n\targs: string (str)\n\tdesc: Writes <string> to the \
terminal.\n\tExample: `write(\"I'm sleepy...\"); # Output: I'm sleepy...`",
),
};
fn writeln(vm: &mut VM, args: &[Primitive]) -> NativeFunctionResult {
let Some(Primitive::Object(ptr)) = args.get(0).cloned() else {
return Err(native::Error::InvalidArgument);
};
let object = vm
.objects()
.get(ptr as usize)
.ok_or(native::Error::InvalidArgument)?;
let ObjectType::String(str) = &object.typ else {
return Err(native::Error::InvalidArgument);
};
println!("{str}");
Ok(Primitive::Empty)
}
pub const WRITELN_FUNCTION: NativeFunction = NativeFunction {
name: "writeln",
function: writeln,
arity: 1,
returns_value: false,
doc: Some(
"NativeFunction writeln: \n\targs: string (str)\n\tdesc: Writes <string> to the terminal \
and starts a new line.\n\tExample: `writeln(\"I'm sleepy...\"); # Output: I'm \
sleepy...\n # This is a new line`",
),
};
fn read(vm: &mut VM, _args: &[Primitive]) -> NativeFunctionResult {
let mut line = String::new();
stdin()
.lock()
.read_line(&mut line)
.map_err(|it| native::Error::Unknown(it.to_string()))?;
let object = Object::new(ObjectType::String(line));
let ptr = vm.objects_mut().allocate(object);
Ok(Primitive::Object(ptr as u32))
}
pub const READ_FUNCTION: NativeFunction = NativeFunction {
name: "read",
function: read,
arity: 0,
returns_value: true,
doc: Some(
"NativeFunction read:\n\tdesc: Reads input from the terminal and returns what was \
read.\n\tExample: `var input = read(); # Hello World <execute code> input = 'Hello \
World'`",
),
};
|
