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use super::functions::get_string;
use super::{CallArgs, FormalArgs, Item, Name, Value};
use crate::css::{CssString, ValueToMapError};
use crate::file_context::FileContext;
use crate::ordermap::OrderMap;
use crate::parser::{Parsed, SourcePos};
use crate::{Error, Scope, ScopeRef};
use std::convert::TryInto;
/// A declared mixin
#[derive(Clone)]
pub enum MixinDecl {
/// an actual mixin
Sass(MixinDeclImpl),
/// The body of a mixin call that does not have a body
NoBody,
/// The special `load-css` mixin.
LoadCss,
}
#[derive(Clone)]
pub struct MixinDeclImpl {
args: FormalArgs,
scope: ScopeRef,
body: Vec<Item>,
pos: SourcePos,
}
impl From<MixinDeclImpl> for MixinDecl {
fn from(decl: MixinDeclImpl) -> Self {
MixinDecl::Sass(decl)
}
}
impl MixinDecl {
/// Create a new Mixin.
pub fn new(
args: &FormalArgs,
scope: &ScopeRef,
body: &[Item],
pos: &SourcePos,
) -> Self {
MixinDeclImpl {
args: args.clone(),
scope: scope.clone(),
body: body.to_vec(),
pos: pos.clone(),
}
.into()
}
pub(crate) fn get(
self,
name: &str,
scope: ScopeRef,
call_args: &CallArgs,
call_pos: &SourcePos,
file_context: &impl FileContext,
) -> Result<Mixin, Error> {
match self {
MixinDecl::Sass(decl) => {
let sel = scope.get_selectors().clone();
Ok(Mixin {
scope: decl
.args
.eval(
ScopeRef::sub_selectors(decl.scope.clone(), sel),
call_args
.evaluate(scope)
.map_err(crate::sass::ArgsError::Eval)?,
)
.map_err(|e| match e {
crate::sass::ArgsError::Eval(e) => e,
ae => Error::BadCall(
ae.to_string(),
call_pos.in_call(name),
Some(decl.pos.clone()),
),
})?,
body: Parsed::Scss(decl.body),
})
}
MixinDecl::NoBody => unreachable!(),
MixinDecl::LoadCss => {
let fargs = FormalArgs::new(vec![
(name!(url), None),
(name!(with), Some(Value::Null)),
]);
let pos = SourcePos::mock_mixin(
&name!(load_css),
&fargs,
"sass:meta",
);
let call_pos2 = call_pos.clone();
let argscope = fargs
.eval(
scope.clone(),
call_args
.evaluate(scope.clone())
.map_err(crate::sass::ArgsError::Eval)?,
)
.map_err(|e| match e {
crate::sass::ArgsError::Eval(e) => e,
ae => Error::BadCall(
ae.to_string(),
call_pos2,
Some(pos),
),
})?;
let call_pos2 = call_pos.clone();
let url = get_string(&argscope, name!(url)).map_err(|e| {
Error::BadCall(e.to_string(), call_pos2, None)
})?;
let call_pos2 = call_pos.clone();
let with = get_opt_map(&argscope, name!(with))
.map_err(|e| Error::BadCall(e, call_pos2, None))?;
if ["sass:color", "sass:list" /*FIXME*/]
.iter()
.any(|name| *name == url.value())
{
if with.unwrap_or_default().is_empty() {
return Ok(Mixin {
scope,
body: Parsed::Css(vec![]),
});
} else {
return Err(Error::BadCall(
format!(
"Error: Built-in module {} can't be configured.",
url.value()
),
call_pos.clone(),
None,
));
}
}
let call_pos2 = call_pos.clone();
let source = file_context
.find_file_use(url.value(), call_pos.clone())?
.ok_or_else(|| {
Error::BadCall(
"Error: Can't find stylesheet to import.".into(),
call_pos2,
None,
)
})?;
let scope = ScopeRef::sub(scope);
if let Some(with) = with {
for (key, value) in with.into_iter() {
scope.define(key.into(), &value);
}
}
Ok(Mixin {
scope,
body: source.parse()?,
})
}
}
}
pub(crate) fn is_no_body(&self) -> bool {
matches!(self, MixinDecl::NoBody)
}
}
/// A mixin is a callable body of items.
#[derive(Clone)]
pub struct Mixin {
/// The scope where this mixin is defined.
pub scope: ScopeRef,
/// The body of this mixin.
pub body: Parsed,
}
impl Mixin {
pub(crate) fn define_content(
&self,
scope: &ScopeRef,
body: &Option<Vec<Item>>,
pos: &SourcePos,
) {
self.scope.define_mixin(
Name::from_static("%%BODY%%"),
match body {
Some(body) => MixinDeclImpl {
args: FormalArgs::none(),
scope: scope.clone(),
body: body.to_vec(),
pos: pos.clone(),
}
.into(),
None => MixinDecl::NoBody,
},
)
}
}
pub(crate) fn get_opt_map(
s: &Scope,
name: Name,
) -> Result<Option<OrderMap<CssString, crate::css::Value>>, String> {
match s.get(&name).map_err(|e| e.to_string())? {
crate::css::Value::Null => Ok(None),
v => v
.try_into()
.map_err(|e| match e {
ValueToMapError::Root(err) => {
format!("Error: ${}: {}", name, err)
}
ValueToMapError::Key(err) => {
format!("Error: ${} key: {}", name, err)
}
})
.map(Some),
}
}