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|
//! Computational utility functions.
use std::cmp::Ordering;
use std::str::FromStr;
use super::prelude::*;
use crate::eval::Array;
/// `assert`: Ensure that a condition is fulfilled.
pub fn assert(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
let Spanned { v, span } = args.expect::<Spanned<bool>>("condition")?;
if !v {
bail!(span, "assertion failed");
}
Ok(Value::None)
}
/// `type`: The name of a value's type.
pub fn type_(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
Ok(args.expect::<Value>("value")?.type_name().into())
}
/// `repr`: The string representation of a value.
pub fn repr(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
Ok(args.expect::<Value>("value")?.repr().into())
}
/// `join`: Join a sequence of values, optionally interspersing it with another
/// value.
pub fn join(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
let span = args.span;
let sep = args.named::<Value>("sep")?.unwrap_or(Value::None);
let mut result = Value::None;
let mut iter = args.all::<Value>();
if let Some(first) = iter.next() {
result = first;
}
for value in iter {
result = result.join(sep.clone()).at(span)?;
result = result.join(value).at(span)?;
}
Ok(result)
}
/// `int`: Convert a value to a integer.
pub fn int(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
let Spanned { v, span } = args.expect("value")?;
Ok(Value::Int(match v {
Value::Bool(v) => v as i64,
Value::Int(v) => v,
Value::Float(v) => v as i64,
Value::Str(v) => match v.parse() {
Ok(v) => v,
Err(_) => bail!(span, "invalid integer"),
},
v => bail!(span, "cannot convert {} to integer", v.type_name()),
}))
}
/// `float`: Convert a value to a float.
pub fn float(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
let Spanned { v, span } = args.expect("value")?;
Ok(Value::Float(match v {
Value::Int(v) => v as f64,
Value::Float(v) => v,
Value::Str(v) => match v.parse() {
Ok(v) => v,
Err(_) => bail!(span, "invalid float"),
},
v => bail!(span, "cannot convert {} to float", v.type_name()),
}))
}
/// `str`: Try to convert a value to a string.
pub fn str(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
let Spanned { v, span } = args.expect("value")?;
Ok(Value::Str(match v {
Value::Int(v) => format_eco!("{}", v),
Value::Float(v) => format_eco!("{}", v),
Value::Str(v) => v,
v => bail!(span, "cannot convert {} to string", v.type_name()),
}))
}
/// `rgb`: Create an RGB(A) color.
pub fn rgb(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
Ok(Value::from(
if let Some(string) = args.find::<Spanned<EcoString>>() {
match RgbaColor::from_str(&string.v) {
Ok(color) => color,
Err(_) => bail!(string.span, "invalid hex string"),
}
} else {
let r = args.expect("red component")?;
let g = args.expect("green component")?;
let b = args.expect("blue component")?;
let a = args.eat()?.unwrap_or(Spanned::new(1.0, Span::detached()));
let f = |Spanned { v, span }: Spanned<f64>| {
if (0.0 ..= 1.0).contains(&v) {
Ok((v * 255.0).round() as u8)
} else {
bail!(span, "value must be between 0.0 and 1.0");
}
};
RgbaColor::new(f(r)?, f(g)?, f(b)?, f(a)?)
},
))
}
/// `abs`: The absolute value of a numeric value.
pub fn abs(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
let Spanned { v, span } = args.expect("numeric value")?;
Ok(match v {
Value::Int(v) => Value::Int(v.abs()),
Value::Float(v) => Value::Float(v.abs()),
Value::Length(v) => Value::Length(v.abs()),
Value::Angle(v) => Value::Angle(v.abs()),
Value::Relative(v) => Value::Relative(v.abs()),
Value::Fractional(v) => Value::Fractional(v.abs()),
Value::Linear(_) => bail!(span, "cannot take absolute value of a linear"),
v => bail!(span, "expected numeric value, found {}", v.type_name()),
})
}
/// `min`: The minimum of a sequence of values.
pub fn min(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
minmax(args, Ordering::Less)
}
/// `max`: The maximum of a sequence of values.
pub fn max(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
minmax(args, Ordering::Greater)
}
/// Find the minimum or maximum of a sequence of values.
fn minmax(args: &mut Args, goal: Ordering) -> TypResult<Value> {
let mut extremum = args.expect::<Value>("value")?;
for Spanned { v, span } in args.all::<Spanned<Value>>() {
match v.partial_cmp(&extremum) {
Some(ordering) => {
if ordering == goal {
extremum = v;
}
}
None => bail!(
span,
"cannot compare {} with {}",
extremum.type_name(),
v.type_name(),
),
}
}
Ok(extremum)
}
/// `range`: Create a sequence of numbers.
pub fn range(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
let first = args.expect::<i64>("end")?;
let (start, end) = match args.eat::<i64>()? {
Some(second) => (first, second),
None => (0, first),
};
let step: i64 = match args.named("step")? {
Some(Spanned { v: 0, span }) => bail!(span, "step must not be zero"),
Some(Spanned { v, .. }) => v,
None => 1,
};
let mut x = start;
let mut seq = vec![];
while x.cmp(&end) == 0.cmp(&step) {
seq.push(Value::Int(x));
x += step;
}
Ok(Value::Array(Array::from_vec(seq)))
}
/// `lower`: Convert a string to lowercase.
pub fn lower(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
Ok(args.expect::<EcoString>("string")?.to_lowercase().into())
}
/// `upper`: Convert a string to uppercase.
pub fn upper(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
Ok(args.expect::<EcoString>("string")?.to_uppercase().into())
}
/// `len`: The length of a string, an array or a dictionary.
pub fn len(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
let Spanned { v, span } = args.expect("collection")?;
Ok(Value::Int(match v {
Value::Str(v) => v.len() as i64,
Value::Array(v) => v.len(),
Value::Dict(v) => v.len(),
v => bail!(
span,
"expected string, array or dictionary, found {}",
v.type_name(),
),
}))
}
/// `sorted`: The sorted version of an array.
pub fn sorted(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
let Spanned { v, span } = args.expect::<Spanned<Array>>("array")?;
Ok(Value::Array(v.sorted().at(span)?))
}
|
