pub fn eval(
        &self,
        scope: ScopeRef,
        args: &css::CallArgs,
    ) -> Result<ScopeRef, ArgsError> {
        let argscope = ScopeRef::sub(scope);
        let n = self.0.len();
        let m = args.len();
        if !self.is_varargs() && m > n {
            return Err(ArgsError::TooMany(n, m));
        }
        for (i, &(ref name, ref default)) in self.0.iter().enumerate() {
            if let Some(value) = args
                .iter()
                .find(|&&(ref k, ref _v)| k.as_deref() == Some(name.as_ref()))
                .map(|&(ref _k, ref v)| v)
            {
                argscope.define(name.clone(), value);
            } else if self.is_varargs() && i + 1 == n && args.len() > n {
                if self.is_varargs() {
                    let args = args
                        .iter()
                        .skip(i)
                        .map(|&(_, ref v)| v.clone())
                        .collect();
                    argscope.define(
                        name.clone(),
                        &css::Value::List(
                            args,
                            Some(ListSeparator::Comma),
                            false,
                        ),
                    );
                } else {
                    return Err(ArgsError::TooMany(n, args.len()));
                }
            } else {
                match args.get(i) {
                    Some(&(None, ref v)) => argscope.define(name.clone(), v),
                    _ => {
                        if let Some(default) = default {
                            let v = default
                                .do_evaluate(argscope.clone(), true)
                                .map_err(ArgsError::Eval)?;
                            argscope.define(name.clone(), &v)
                        } else if i + 1 == self.0.len() && self.is_varargs() {
                            argscope.define(
                                name.clone(),
                                &css::Value::List(vec![], None, false),
                            )
                        } else {
                            return Err(ArgsError::Missing(name.clone()));
                        }
                    }
                };
            }
        }
        Ok(argscope)
    }
/// Evaluate a set of call arguments for these formal arguments.
///
/// Returns a Scope that is a sub-scope to the given `scope`.
Evaluate a set of call arguments for these formal arguments.
Returns a Scope that is a sub-scope to the given `scope`.
Evaluate a set of call arguments for these formal arguments . Returns a Scope that is a sub - scope to the given ` scope ` .
pub fn eval(
        &self,
        scope: ScopeRef,
        args: &css::CallArgs,
    ) -> Result<ScopeRef, ArgsError> {
        let argscope = ScopeRef::sub(scope);
        let n = self.0.len();
        let m = args.len();
        if !self.is_varargs() && m > n {
            return Err(ArgsError::TooMany(n, m));
        }
        for (i, &(ref name, ref default)) in self.0.iter().enumerate() {
            if let Some(value) = args
                .iter()
                .find(|&&(ref k, ref _v)| k.as_deref() == Some(name.as_ref()))
                .map(|&(ref _k, ref v)| v)
            {
                argscope.define(name.clone(), value);
            } else if self.is_varargs() && i + 1 == n && args.len() > n {
                if self.is_varargs() {
                    let args = args
                        .iter()
                        .skip(i)
                        .map(|&(_, ref v)| v.clone())
                        .collect();
                    argscope.define(
                        name.clone(),
                        &css::Value::List(
                            args,
                            Some(ListSeparator::Comma),
                            false,
                        ),
                    );
                } else {
                    return Err(ArgsError::TooMany(n, args.len()));
                }
            } else {
                match args.get(i) {
                    Some(&(None, ref v)) => argscope.define(name.clone(), v),
                    _ => {
                        if let Some(default) = default {
                            let v = default
                                .do_evaluate(argscope.clone(), true)
                                .map_err(ArgsError::Eval)?;
                            argscope.define(name.clone(), &v)
                        } else if i + 1 == self.0.len() && self.is_varargs() {
                            argscope.define(
                                name.clone(),
                                &css::Value::List(vec![], None, false),
                            )
                        } else {
                            return Err(ArgsError::Missing(name.clone()));
                        }
                    }
                };
            }
        }
        Ok(argscope)
    }
pub fn eval ( & self , scope : ScopeRef , args : & css :: CallArgs , ) -> Result < ScopeRef , ArgsError > { let argscope = ScopeRef :: sub ( scope ) ; let n = self . 0 . len ( ) ; let m = args . len ( ) ; if ! self . is_varargs ( ) && m > n { return Err ( ArgsError :: TooMany ( n , m ) ) ; } for ( i , & ( ref name , ref default ) ) in self . 0 . iter ( ) . enumerate ( ) { if let Some ( value ) = args . iter ( ) . find ( | & & ( ref k , ref _v ) | k . as_deref ( ) == Some ( name . as_ref ( ) ) ) . map ( | & ( ref _k , ref v ) | v ) { argscope . define ( name . clone ( ) , value ) ; } else if self . is_varargs ( ) && i + 1 == n && args . len ( ) > n { if self . is_varargs ( ) { let args = args . iter ( ) . skip ( i ) . map ( | & ( _ , ref v ) | v . clone ( ) ) . collect ( ) ; argscope . define ( name . clone ( ) , & css :: Value :: List ( args , Some ( ListSeparator :: Comma ) , false , ) , ) ; } else { return Err ( ArgsError :: TooMany ( n , args . len ( ) ) ) ; } } else { match args . get ( i ) { Some ( & ( None , ref v ) ) => argscope . define ( name . clone ( ) , v ) , _ => { if let Some ( default ) = default { let v = default . do_evaluate ( argscope . clone ( ) , true ) . map_err ( ArgsError :: Eval ) ? ; argscope . define ( name . clone ( ) , & v ) } else if i + 1 == self . 0 . len ( ) && self . is_varargs ( ) { argscope . define ( name . clone ( ) , & css :: Value :: List ( vec ! [ ] , None , false ) , ) } else { return Err ( ArgsError :: Missing ( name . clone ( ) ) ) ; } } } ; } } Ok ( argscope ) }
Evaluate a set of call arguments for these formal arguments.
Evaluate a set of call arguments for these formal arguments .
&self
scope
ScopeRef
args
&css::CallArgs