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use css;
use error::Error;
use sass;
use std::{cmp, fmt};
use std::collections::BTreeMap;
use std::sync::Arc;
use variablescope::Scope;
#[macro_use]
mod macros;
mod colors_rgb;
mod colors_hsl;
mod colors_other;
mod introspection;
mod numbers;
mod maps;
mod strings;
mod lists;
pub fn get_builtin_function(name: &str) -> Option<&'static SassFunction> {
let name = name.replace("-", "_");
let name: &str = &name;
FUNCTIONS.get(name)
}
type BuiltinFn = Fn(&Scope) -> Result<css::Value, Error> + Send + Sync;
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct SassFunction {
args: sass::FormalArgs,
body: FuncImpl,
}
#[derive(Clone)]
pub enum FuncImpl {
Builtin(Arc<BuiltinFn>),
UserDefined(Vec<sass::Item>),
}
impl cmp::PartialEq for FuncImpl {
fn eq(&self, rhs: &FuncImpl) -> bool {
match (self, rhs) {
(&FuncImpl::UserDefined(ref a), &FuncImpl::UserDefined(ref b)) => {
a == b
}
_ => false,
}
}
}
impl cmp::Eq for FuncImpl {}
impl fmt::Debug for FuncImpl {
fn fmt(&self, out: &mut fmt::Formatter) -> Result<(), fmt::Error> {
match *self {
FuncImpl::Builtin(_) => write!(out, "(builtin function)"),
FuncImpl::UserDefined(_) => write!(out, "(user-defined function)"),
}
}
}
impl SassFunction {
pub fn builtin(args: Vec<(String, sass::Value)>,
is_varargs: bool,
body: Arc<BuiltinFn>)
-> Self {
SassFunction {
args: sass::FormalArgs::new(args, is_varargs),
body: FuncImpl::Builtin(body),
}
}
pub fn new(args: sass::FormalArgs, body: Vec<sass::Item>) -> Self {
SassFunction { args: args, body: FuncImpl::UserDefined(body) }
}
pub fn call(&self,
scope: &Scope,
args: &css::CallArgs)
-> Result<css::Value, Error> {
let mut s = self.args.eval(scope, args);
match self.body {
FuncImpl::Builtin(ref body) => body(&s),
FuncImpl::UserDefined(ref body) => {
Ok(s.eval_body(body).unwrap_or(css::Value::Null))
}
}
}
}
lazy_static! {
static ref FUNCTIONS: BTreeMap<&'static str, SassFunction> = {
let mut f = BTreeMap::new();
def!(f, if(condition, if_true, if_false), |s| {
if s.get("condition").is_true() {
Ok(s.get("if_true"))
} else {
Ok(s.get("if_false"))
}
});
colors_hsl::register(&mut f);
colors_rgb::register(&mut f);
colors_other::register(&mut f);
introspection::register(&mut f);
strings::register(&mut f);
numbers::register(&mut f);
lists::register(&mut f);
maps::register(&mut f);
f
};
}
#[test]
fn test_rgb() {
use parser::formalargs::call_args;
use num_rational::Rational;
use num_traits::{One, Zero};
use variablescope::GlobalScope;
let scope = GlobalScope::new();
assert_eq!(FUNCTIONS
.get("rgb")
.unwrap()
.call(&scope,
&call_args(b"(17, 0, 225)")
.unwrap()
.1
.evaluate(&scope, true))
.unwrap(),
css::Value::Color(Rational::new(17, 1),
Rational::zero(),
Rational::new(225, 1),
Rational::one(),
None))
}
#[test]
fn test_nth() {
assert_eq!("foo", do_evaluate(&[("x", "foo, bar")], b"nth($x, 1);"))
}
#[cfg(test)]
use super::variablescope::test::do_evaluate;