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Error messages for color::other functions

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This commit is contained in:
ConnorSkees 2020-02-16 22:30:29 -05:00
parent e5bbba3462
commit 5ee5f59b2c
2 changed files with 38 additions and 16 deletions
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43
src/builtin/color/other.rs
View File

@ -7,12 +7,23 @@ use crate::units::Unit;
use crate::value::{Number, Value};
macro_rules! opt_arg {
($args:ident, $name:ident, $arg:literal) => {
($args:ident, $name:ident, $arg:literal, $high:literal, $low:literal) => {
let $name = match arg!($args, -1, $arg = Value::Null) {
Value::Dimension(n, Unit::None) => Some(n),
Value::Dimension(n, Unit::Percent) => Some(n / Number::from(100)),
Value::Dimension(n, u) => Some(bound!($arg, n, u, $high, $low)),
Value::Null => None,
_ => todo!(concat!("expected either unitless or % number for $", $arg)),
v => return Err(format!("${}: {} is not a number.", $arg, v).into()),
};
};
(scale: $args:ident, $name:ident, $arg:literal, $high:literal, $low:literal) => {
let $name = match arg!($args, -1, $arg = Value::Null) {
Value::Dimension(n, Unit::Percent) => {
Some(bound!($arg, n, Unit::Percent, $high, $low) / Number::from(100))
}
v @ Value::Dimension(..) => {
return Err(format!("${}: Expected {} to have unit \"%\".", $arg, v).into())
}
Value::Null => None,
v => return Err(format!("${}: {} is not a number.", $arg, v).into()),
};
};
(hsl: $args:ident, $name:ident, $arg:literal) => {
@ -37,10 +48,10 @@ pub(crate) fn register(f: &mut BTreeMap<String, Builtin>) {
v => return Err(format!("$color: {} is not a color.", v).into()),
};
opt_arg!(args, alpha, "alpha");
opt_arg!(args, red, "red");
opt_arg!(args, green, "green");
opt_arg!(args, blue, "blue");
opt_arg!(args, alpha, "alpha", -1, 1);
opt_arg!(args, red, "red", -255, 255);
opt_arg!(args, green, "green", -255, 255);
opt_arg!(args, blue, "blue", -255, 255);
if red.is_some() || green.is_some() || blue.is_some() {
return Ok(Value::Color(Color::from_rgba(red.unwrap_or(color.red()), green.unwrap_or(color.green()), blue.unwrap_or(color.blue()), alpha.unwrap_or(color.alpha()))))
@ -75,10 +86,10 @@ pub(crate) fn register(f: &mut BTreeMap<String, Builtin>) {
v => return Err(format!("$color: {} is not a color.", v).into()),
};
opt_arg!(args, alpha, "alpha");
opt_arg!(args, red, "red");
opt_arg!(args, green, "green");
opt_arg!(args, blue, "blue");
opt_arg!(args, alpha, "alpha", -1, 1);
opt_arg!(args, red, "red", -255, 255);
opt_arg!(args, green, "green", -255, 255);
opt_arg!(args, blue, "blue", -255, 255);
if red.is_some() || green.is_some() || blue.is_some() {
return
@ -129,10 +140,10 @@ pub(crate) fn register(f: &mut BTreeMap<String, Builtin>) {
v => return Err(format!("$color: {} is not a color.", v).into()),
};
opt_arg!(args, alpha, "alpha");
opt_arg!(args, red, "red");
opt_arg!(args, green, "green");
opt_arg!(args, blue, "blue");
opt_arg!(scale: args, alpha, "alpha", -100, 100);
opt_arg!(scale: args, red, "red", -100, 100);
opt_arg!(scale: args, green, "green", -100, 100);
opt_arg!(scale: args, blue, "blue", -100, 100);
if red.is_some() || green.is_some() || blue.is_some() {
return

11
src/builtin/macros.rs
View File

@ -59,4 +59,15 @@ macro_rules! bound {
$arg
}
};
($name:literal, $arg:ident, $unit:path, $low:literal, $high:literal) => {
if $arg > Number::from($high) || $arg < Number::from($low) {
return Err(format!(
"${}: Expected {}{} to be within {}{} and {}{}.",
$name, $arg, $unit, $low, $unit, $high, $unit,
)
.into());
} else {
$arg
}
};
}