Emmanuel BENOîT
d8dba3ac5f
* Probably not the last time.
* Object-like things (functions, classes, etc...) are stored as
ref-counted cells.
* Separate data structure for native functions.
* with_callable() method on value to run specific code on objects
that are callable
* Instance type added.
* Instance construction implemented
94 lines
2.3 KiB
Rust
94 lines
2.3 KiB
Rust
use std::{
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fmt::{Debug, Display},
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time::{SystemTime, UNIX_EPOCH},
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};
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use crate::errors::SloxResult;
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use super::{Callable, InterpreterState, Value};
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/* ----------------------- *
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* Native function support *
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* ----------------------- */
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/// A function pointer to the implementation of some native function.
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type NativeFunctionHandler = fn(&mut InterpreterState, Vec<Value>) -> SloxResult<Value>;
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/// A native function.
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#[derive(Clone)]
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pub struct NativeFunction {
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/// Name of the function.
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name: String,
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/// Arity of the function.
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arity: usize,
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/// Rust function that actually implements the function.
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handler: NativeFunctionHandler,
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}
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impl NativeFunction {
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/// Initialize a native function's record.
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fn new(name: &str, arity: usize, handler: NativeFunctionHandler) -> Self {
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Self {
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name: name.to_owned(),
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arity,
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handler,
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}
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}
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/// Access the native function's name
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pub fn name(&self) -> &str {
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&self.name
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}
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}
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impl PartialEq for NativeFunction {
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fn eq(&self, other: &Self) -> bool {
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self.name == other.name
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}
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}
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impl Display for NativeFunction {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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f.write_str("<native function ")?;
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f.write_str(&self.name)?;
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f.write_str(">")
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}
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}
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impl Debug for NativeFunction {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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f.write_fmt(format_args!(
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"NativeFunction {{ name: {:?}, arity: {} }}",
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self.name, self.arity
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))
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}
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}
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impl Callable for NativeFunction {
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fn arity(&self) -> usize {
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self.arity
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}
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fn call(&self, itpr_state: &mut InterpreterState, arguments: Vec<Value>) -> SloxResult<Value> {
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(self.handler)(itpr_state, arguments)
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}
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}
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/* ----------- *
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* clock() *
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* ----------- */
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fn _clock_implementation(
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_environment: &mut InterpreterState,
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_arguments: Vec<Value>,
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) -> SloxResult<Value> {
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let now = SystemTime::now();
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let since_epoch = now
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.duration_since(UNIX_EPOCH)
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.expect("looks like it's 2038 already");
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Ok(Value::Number((since_epoch.as_millis() as f64) / 1000.0))
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}
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pub(super) fn clock() -> NativeFunction {
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NativeFunction::new("clock", 0, _clock_implementation)
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}
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