use async_trait::async_trait;
use endbasic_core::ast::{Expr, FunctionCallSpan, Value, VarType};
use endbasic_core::eval;
use endbasic_core::exec::Machine;
use endbasic_core::syms::{
Array, CallError, CallableMetadata, CallableMetadataBuilder, Function, FunctionResult, Symbol,
Symbols,
};
use std::rc::Rc;
const CATEGORY: &str = "Array functions";
#[allow(clippy::needless_lifetimes)]
async fn parse_bound_args<'a>(
args: &[Expr],
symbols: &'a mut Symbols,
) -> Result<(&'a Array, usize), CallError> {
let mut iter = args.iter();
let (arrayref, arraypos) = match iter.next() {
Some(Expr::Symbol(span)) => (&span.vref, span.pos),
_ => return Err(CallError::SyntaxError),
};
let dim = match iter.next() {
Some(expr) => {
let value = expr.eval(symbols).await?;
let i = value
.as_i32()
.map_err(|e| CallError::ArgumentError(expr.start_pos(), format!("{}", e)))?;
if i < 0 {
return Err(CallError::ArgumentError(
expr.start_pos(),
format!("Dimension {} must be positive", i),
));
}
Some((i as usize, expr.start_pos()))
}
None => None,
};
if iter.next().is_some() {
return Err(CallError::SyntaxError);
}
let array = match symbols
.get(arrayref)
.map_err(|e| eval::Error::from_value_error(e, arraypos))?
{
Some(Symbol::Array(array)) => array,
Some(_) => {
return Err(CallError::ArgumentError(
arraypos,
format!("{} must be an array reference", arrayref),
))
}
_ => {
return Err(CallError::ArgumentError(arraypos, format!("{} is not defined", arrayref)))
}
};
match dim {
Some(dim) => {
if dim.0 > array.dimensions().len() {
return Err(CallError::ArgumentError(
dim.1,
format!(
"Array {} has only {} dimensions but asked for {}",
arrayref,
array.dimensions().len(),
dim.0
),
));
}
}
None => {
if array.dimensions().len() != 1 {
return Err(CallError::ArgumentError(
arraypos,
"Requires a dimension for multidimensional arrays".to_owned(),
));
}
}
}
Ok((array, dim.map(|(i, _pos)| i).unwrap_or(1)))
}
pub struct LboundFunction {
metadata: CallableMetadata,
}
impl LboundFunction {
pub fn new() -> Rc<Self> {
Rc::from(Self {
metadata: CallableMetadataBuilder::new("LBOUND", VarType::Integer)
.with_syntax("array[, dimension%]")
.with_category(CATEGORY)
.with_description(
"Returns the lower bound for the given dimension of the array.
The lower bound is the smallest available subscript that can be provided to array indexing \
operations.
For one-dimensional arrays, the dimension% is optional. For multi-dimensional arrays, the \
dimension% is a 1-indexed integer.",
)
.build(),
})
}
}
#[async_trait(?Send)]
impl Function for LboundFunction {
fn metadata(&self) -> &CallableMetadata {
&self.metadata
}
async fn exec(&self, span: &FunctionCallSpan, symbols: &mut Symbols) -> FunctionResult {
let (_array, _dim) = parse_bound_args(&span.args, symbols).await?;
Ok(Value::Integer(0))
}
}
pub struct UboundFunction {
metadata: CallableMetadata,
}
impl UboundFunction {
pub fn new() -> Rc<Self> {
Rc::from(Self {
metadata: CallableMetadataBuilder::new("UBOUND", VarType::Integer)
.with_syntax("array[, dimension%]")
.with_category(CATEGORY)
.with_description(
"Returns the upper bound for the given dimension of the array.
The upper bound is the largest available subscript that can be provided to array indexing \
operations.
For one-dimensional arrays, the dimension% is optional. For multi-dimensional arrays, the \
dimension% is a 1-indexed integer.",
)
.build(),
})
}
}
#[async_trait(?Send)]
impl Function for UboundFunction {
fn metadata(&self) -> &CallableMetadata {
&self.metadata
}
async fn exec(&self, span: &FunctionCallSpan, symbols: &mut Symbols) -> FunctionResult {
let (array, dim) = parse_bound_args(&span.args, symbols).await?;
Ok(Value::Integer((array.dimensions()[dim - 1] - 1) as i32))
}
}
pub fn add_all(machine: &mut Machine) {
machine.add_function(LboundFunction::new());
machine.add_function(UboundFunction::new());
}
#[cfg(test)]
mod tests {
use crate::testutils::*;
use endbasic_core::ast::{Value, VarType};
fn do_bound_errors_test(func: &str) {
Tester::default()
.run(&format!("DIM x(2): result = {}()", func))
.expect_err(format!("1:20: In call to {}: expected array[, dimension%]", func))
.expect_array("x", VarType::Integer, &[2], vec![])
.check();
Tester::default()
.run(&format!("DIM x(2): result = {}(x, 1, 2)", func))
.expect_err(format!("1:20: In call to {}: expected array[, dimension%]", func))
.expect_array("x", VarType::Integer, &[2], vec![])
.check();
Tester::default()
.run(&format!("DIM x(2): result = {}(x, -1)", func))
.expect_err(format!("1:20: In call to {}: 1:30: Dimension -1 must be positive", func))
.expect_array("x", VarType::Integer, &[2], vec![])
.check();
Tester::default()
.run(&format!("DIM x(2): result = {}(x, TRUE)", func))
.expect_err(format!("1:20: In call to {}: 1:30: TRUE is not a number", func))
.expect_array("x", VarType::Integer, &[2], vec![])
.check();
Tester::default()
.run(&format!("i = 0: result = {}(i)", func))
.expect_err(format!("1:17: In call to {}: 1:24: i must be an array reference", func))
.expect_var("i", Value::Integer(0))
.check();
Tester::default()
.run(&format!("i = 0: result = {}(i$)", func))
.expect_err(format!(
"1:17: In call to {}: 1:24: Incompatible types in i$ reference",
func
))
.expect_var("i", Value::Integer(0))
.check();
Tester::default()
.run(&format!("result = {}(x)", func))
.expect_err(format!("1:10: In call to {}: 1:17: x is not defined", func))
.check();
Tester::default()
.run(&format!("DIM x(2, 3, 4): result = {}(x)", func))
.expect_err(format!(
"1:26: In call to {}: 1:33: Requires a dimension for multidimensional arrays",
func
))
.expect_array("x", VarType::Integer, &[2, 3, 4], vec![])
.check();
Tester::default()
.run(&format!("DIM x(2, 3, 4): result = {}(x, 5)", func))
.expect_err(format!(
"1:26: In call to {}: 1:36: Array x has only 3 dimensions but asked for 5",
func
))
.expect_array("x", VarType::Integer, &[2, 3, 4], vec![])
.check();
}
#[test]
fn test_lbound_ok() {
Tester::default()
.run("DIM x(10): result = LBOUND(x)")
.expect_var("result", 0i32)
.expect_array("x", VarType::Integer, &[10], vec![])
.check();
Tester::default()
.run("DIM x(10, 20): result = LBOUND(x, 1)")
.expect_var("result", 0i32)
.expect_array("x", VarType::Integer, &[10, 20], vec![])
.check();
Tester::default()
.run("DIM x(10, 20): result = LBOUND(x, 2.1)")
.expect_var("result", 0i32)
.expect_array("x", VarType::Integer, &[10, 20], vec![])
.check();
}
#[test]
fn test_lbound_errors() {
do_bound_errors_test("LBOUND");
}
#[test]
fn test_ubound_ok() {
Tester::default()
.run("DIM x(10): result = UBOUND(x)")
.expect_var("result", 9i32)
.expect_array("x", VarType::Integer, &[10], vec![])
.check();
Tester::default()
.run("DIM x(10, 20): result = UBOUND(x, 1)")
.expect_var("result", 9i32)
.expect_array("x", VarType::Integer, &[10, 20], vec![])
.check();
Tester::default()
.run("DIM x(10, 20): result = UBOUND(x, 2.1)")
.expect_var("result", 19i32)
.expect_array("x", VarType::Integer, &[10, 20], vec![])
.check();
}
#[test]
fn test_ubound_errors() {
do_bound_errors_test("UBOUND");
}
#[test]
fn test_bound_integration() {
Tester::default()
.run("DIM x(5): FOR i = LBOUND(x) TO UBOUND(x): x(i) = i * 2: NEXT")
.expect_var("i", 5i32)
.expect_array_simple(
"x",
VarType::Integer,
vec![0i32.into(), 2i32.into(), 4i32.into(), 6i32.into(), 8i32.into()],
)
.check();
}
}