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|
use std::rc::Rc;
use rebel_lang::{
func::{Func, FuncDef, FuncType},
scope::{MethodMap, Scope},
typing::{self, Type, TypeFamily, VarType},
value::{self, Value},
Error, Result,
};
use rebel_parse::{recipe, tokenize};
use reedline::{DefaultPrompt, DefaultPromptSegment, Reedline, Signal, ValidationResult};
fn intrinsic_array_len(params: &[Value]) -> Result<Value> {
assert!(params.len() == 1);
let Value::Array(array) = ¶ms[0] else {
panic!();
};
Ok(Value::Int(
array
.len()
.try_into()
.or(Err(Error::eval("array length out of bounds")))?,
))
}
fn intrinsic_string_len(params: &[Value]) -> Result<Value> {
assert!(params.len() == 1);
let Value::Str(string) = ¶ms[0] else {
panic!();
};
Ok(Value::Int(
string
.chars()
.count()
.try_into()
.or(Err(Error::eval("string length out of bounds")))?,
))
}
struct Validator;
impl reedline::Validator for Validator {
fn validate(&self, line: &str) -> ValidationResult {
if tokenize::token_stream(line).is_ok() {
ValidationResult::Complete
} else {
ValidationResult::Incomplete
}
}
}
fn main() {
let mut methods = MethodMap::default();
methods.entry(TypeFamily::Array).or_default().insert(
"len",
Func {
typ: FuncType {
params: vec![Type::Array(Box::new(Type::Free))],
ret: Type::Int,
},
def: Some(FuncDef::Intrinsic(intrinsic_array_len)),
},
);
methods.entry(TypeFamily::Str).or_default().insert(
"len",
Func {
typ: FuncType {
params: vec![Type::Str],
ret: Type::Int,
},
def: Some(FuncDef::Intrinsic(intrinsic_string_len)),
},
);
let methods = Rc::new(methods);
let mut type_scope = Box::<Scope<VarType>>::default();
type_scope.methods = methods.clone();
let mut value_scope = Box::<Scope<Value>>::default();
value_scope.methods = methods.clone();
let mut rl = Reedline::create().with_validator(Box::new(Validator));
let prompt = DefaultPrompt::new(DefaultPromptSegment::Empty, DefaultPromptSegment::Empty);
loop {
let input = match rl.read_line(&prompt).unwrap() {
Signal::Success(input) => input,
Signal::CtrlC => continue,
Signal::CtrlD => break,
};
let tokens = match tokenize::token_stream(&input) {
Ok(value) => value,
Err(err) => {
println!("Tokenize error: {err}");
continue;
}
};
let stmt = match recipe::block_stmt(&tokens) {
Ok(value) => value,
Err(err) => {
println!("Parse error: {err}");
continue;
}
};
if let Err(err) = stmt.validate() {
println!("Validation error: {err:?}");
continue;
}
let mut type_scope_tmp = type_scope.clone();
let mut type_ctx = typing::Context(&mut type_scope_tmp);
let typ = match type_ctx.type_block_stmt(&stmt) {
Ok(typ) => typ,
Err(err) => {
println!("Type checking failed: {err}");
continue;
}
};
let mut value_scope_tmp = value_scope.clone();
let mut value_ctx = value::Context(&mut value_scope_tmp);
let value = match value_ctx.eval_block_stmt(&stmt) {
Ok(value) => value,
Err(err) => {
println!("Evaluation failed: {err}");
continue;
}
};
if value != Value::Unit {
println!("{value}: {typ}");
}
type_scope = type_scope_tmp;
value_scope = value_scope_tmp;
}
}
|
