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Add stepping to ranges & enable reverse ranges

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Follows the following syntax: <start>..<next-value>..<end>
This commit is contained in:
Jakub Žádník
2021-09-11 14:13:04 +03:00
parent 2d3a56f0d3
commit 4749776984
8 changed files with 207 additions and 102 deletions
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37
crates/nu-engine/src/eval.rs
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@ -85,13 +85,19 @@ pub fn eval_expression(
val: *f,
span: expr.span,
}),
Expr::Range(from, to, operator) => {
// TODO: Embed the min/max into Range and set max to be the true max
Expr::Range(from, next, to, operator) => {
let from = if let Some(f) = from {
eval_expression(context, f)?
} else {
Value::Int {
val: 0i64,
Value::Nothing {
span: Span::unknown(),
}
};
let next = if let Some(s) = next {
eval_expression(context, s)?
} else {
Value::Nothing {
span: Span::unknown(),
}
};
@ -99,31 +105,13 @@ pub fn eval_expression(
let to = if let Some(t) = to {
eval_expression(context, t)?
} else {
Value::Int {
val: 100i64,
Value::Nothing {
span: Span::unknown(),
}
};
let range = match (&from, &to) {
(&Value::Int { .. }, &Value::Int { .. }) => Range {
from: from.clone(),
to: to.clone(),
inclusion: operator.inclusion,
},
(lhs, rhs) => {
return Err(ShellError::OperatorMismatch {
op_span: operator.span,
lhs_ty: lhs.get_type(),
lhs_span: lhs.span(),
rhs_ty: rhs.get_type(),
rhs_span: rhs.span(),
})
}
};
Ok(Value::Range {
val: Box::new(range),
val: Box::new(Range::new(expr.span, from, next, to, operator)?),
span: expr.span,
})
}
@ -159,7 +147,6 @@ pub fn eval_expression(
x => Err(ShellError::UnsupportedOperator(x, op_span)),
}
}
Expr::Subexpression(block_id) => {
let engine_state = context.engine_state.borrow();
let block = engine_state.get_block(*block_id);