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use super::{Call, CallError, Name, Value};
use crate::ordermap::OrderMap;
use crate::value::ListSeparator;
use crate::{css, Error, Invalid, ScopeRef};
use std::default::Default;
/// the actual arguments of a function or mixin call.
///
/// Each argument has a Value. Arguments may be named.
/// If the optional name is None, the argument is positional.
#[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd)]
pub struct CallArgs {
positional: Vec<Value>,
// Ordered for formattig.
named: OrderMap<Name, Value>,
trailing_comma: bool,
}
impl CallArgs {
/// Create a new callargs from a vec of name-value pairs.
///
/// The names are `None` for positional arguments.
pub fn new(
v: Vec<(Option<Name>, Value)>,
trailing_comma: bool,
) -> Result<Self, Invalid> {
let mut positional = Vec::new();
let mut named = OrderMap::new();
for (name, value) in v {
if let Some(name) = name {
if let Some(_old) = named.insert(name, value) {
return Err(Invalid::DuplicateArgument);
}
} else if named.is_empty() || is_splat(&value).is_some() {
positional.push(value);
} else {
return Err(Invalid::PositionalArgAfterNamed);
}
}
Ok(Self {
positional,
named,
trailing_comma,
})
}
/// Create a new `CallArgs` from one single unnamed argument.
pub fn new_single(value: Value) -> Self {
Self {
positional: vec![value],
named: Default::default(),
trailing_comma: false,
}
}
/// Evaluate these sass `CallArgs` to css `CallArgs`.
pub fn evaluate(&self, scope: ScopeRef) -> Result<Call, CallError> {
let named = self.named.iter().try_fold(
OrderMap::new(),
|mut acc, (name, arg)| {
let arg = arg.do_evaluate(scope.clone(), true)?;
acc.insert(name.clone(), arg);
Ok::<_, Error>(acc)
},
)?;
let mut result = css::CallArgs {
positional: Vec::new(),
named,
trailing_comma: self.trailing_comma,
};
for arg in &self.positional {
match is_splat(arg) {
Some([one]) => match one.do_evaluate(scope.clone(), true)? {
css::Value::ArgList(args) => {
result.positional.extend(args.positional);
for (name, value) in args.named {
if let Some(_existing) =
result.named.insert(name, value)
{
return Err(Invalid::DuplicateArgument.into());
}
}
}
css::Value::Map(map) => {
result
.add_from_value_map(map)
.map_err(CallError::msg)?;
}
css::Value::List(items, ..) => {
for item in items {
result.positional.push(item);
}
}
css::Value::Null => (),
item => {
result.positional.push(item);
result.trailing_comma = false;
}
},
Some(splat) => {
for arg in splat {
result
.positional
.push(arg.do_evaluate(scope.clone(), true)?);
}
}
None => {
result
.positional
.push(arg.do_evaluate(scope.clone(), true)?);
}
}
}
Ok(Call {
args: result,
scope,
})
}
/// Evaluate a single argument
///
/// Only used by the `if` function, which is the only sass
/// function that evaluates its arguments lazily.
pub fn evaluate_single(
&self,
scope: ScopeRef,
name: Name,
num: usize,
) -> Result<css::Value, Error> {
// TODO: Error if both name and posinal exists?
if let Some(v) = self.named.get(&name) {
return v.do_evaluate(scope, true);
}
let mut i = 0;
for a in &self.positional {
match is_splat(a) {
Some([one]) => match one.do_evaluate(scope.clone(), true)? {
css::Value::ArgList(args) => {
if let Some(v) = args
.named
.get(&name)
.or_else(|| args.positional.get(num - i))
{
return Ok(v.clone());
}
i += if args.named.is_empty() {
args.len()
} else {
num + 1
};
}
css::Value::Map(map) => {
if let Some(v) = map.get(&name.to_string().into()) {
return Ok(v.clone());
}
i += num + 1;
}
css::Value::List(items, ..) => {
if let Some(v) = items.get(num - i) {
return Ok(v.clone());
}
i += items.len();
}
css::Value::Null => (),
v => {
if i == num {
return Ok(v);
}
i += 1;
}
},
Some(splat) => {
if let Some(v) = splat.get(num - i) {
return v.do_evaluate(scope, true);
}
i += splat.len();
}
None => {
if i == num {
return a.do_evaluate(scope, true);
}
i += 1;
}
}
}
Ok(css::Value::Null)
}
}
fn is_splat(arg: &Value) -> Option<&[Value]> {
if let Value::List(list, sep, false) = arg {
if let Some((Value::Literal(v, ..), splat)) = list.split_last() {
if v.is_unquoted()
&& v.single_raw() == Some("...")
&& sep.unwrap_or_default() == ListSeparator::Space
{
return Some(splat);
}
}
}
None
}