pub fn eval(
        &self,
        scope: ScopeRef,
        args: css::CallArgs,
    ) -> Result<ScopeRef, ArgsError> {
        let mut args = args;
        let argscope = ScopeRef::sub(scope);
        if !self.is_varargs() {
            let n = self.0.len();
            let m = args.len();
            if m > n {
                let n_p = args.positional.len();
                if n_p != m && n_p > n {
                    return Err(ArgsError::TooManyPos(n, n_p));
                } else {
                    return Err(ArgsError::TooMany(n, n_p));
                }
            }
        }
        let positional = args.take_positional(self.0.len());
        for ((name, _default), value) in self.0.iter().zip(&positional) {
            argscope.define(name.clone(), value);
        }
        if self.0.len() > positional.len() {
            for (name, default) in &self.0[positional.len()..] {
                if let Some(v) = args.named.remove(name) {
                    argscope.define(name.clone(), &v);
                } else if let Some(default) = default {
                    argscope.define(
                        name.clone(),
                        &default
                            .do_evaluate(argscope.clone(), true)
                            .map_err(ArgsError::Eval)?,
                    );
                } else {
                    return Err(ArgsError::Missing(name.clone()));
                }
            }
        }
        if let Some(va_name) = &self.1 {
            argscope.define(
                va_name.clone(),
                &args.only_named(va_name).unwrap_or_else(|| args.into()),
            );
        } else {
            args.check_no_named()?;
        }
        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 mut args = args;
        let argscope = ScopeRef::sub(scope);
        if !self.is_varargs() {
            let n = self.0.len();
            let m = args.len();
            if m > n {
                let n_p = args.positional.len();
                if n_p != m && n_p > n {
                    return Err(ArgsError::TooManyPos(n, n_p));
                } else {
                    return Err(ArgsError::TooMany(n, n_p));
                }
            }
        }
        let positional = args.take_positional(self.0.len());
        for ((name, _default), value) in self.0.iter().zip(&positional) {
            argscope.define(name.clone(), value);
        }
        if self.0.len() > positional.len() {
            for (name, default) in &self.0[positional.len()..] {
                if let Some(v) = args.named.remove(name) {
                    argscope.define(name.clone(), &v);
                } else if let Some(default) = default {
                    argscope.define(
                        name.clone(),
                        &default
                            .do_evaluate(argscope.clone(), true)
                            .map_err(ArgsError::Eval)?,
                    );
                } else {
                    return Err(ArgsError::Missing(name.clone()));
                }
            }
        }
        if let Some(va_name) = &self.1 {
            argscope.define(
                va_name.clone(),
                &args.only_named(va_name).unwrap_or_else(|| args.into()),
            );
        } else {
            args.check_no_named()?;
        }
        Ok(argscope)
    }
pub fn eval ( & self , scope : ScopeRef , args : css :: CallArgs , ) -> Result < ScopeRef , ArgsError > { let mut args = args ; let argscope = ScopeRef :: sub ( scope ) ; if ! self . is_varargs ( ) { let n = self . 0 . len ( ) ; let m = args . len ( ) ; if m > n { let n_p = args . positional . len ( ) ; if n_p != m && n_p > n { return Err ( ArgsError :: TooManyPos ( n , n_p ) ) ; } else { return Err ( ArgsError :: TooMany ( n , n_p ) ) ; } } } let positional = args . take_positional ( self . 0 . len ( ) ) ; for ( ( name , _default ) , value ) in self . 0 . iter ( ) . zip ( & positional ) { argscope . define ( name . clone ( ) , value ) ; } if self . 0 . len ( ) > positional . len ( ) { for ( name , default ) in & self . 0 [ positional . len ( ) .. ] { if let Some ( v ) = args . named . remove ( name ) { argscope . define ( name . clone ( ) , & v ) ; } else if let Some ( default ) = default { argscope . define ( name . clone ( ) , & default . do_evaluate ( argscope . clone ( ) , true ) . map_err ( ArgsError :: Eval ) ? , ) ; } else { return Err ( ArgsError :: Missing ( name . clone ( ) ) ) ; } } } if let Some ( va_name ) = & self . 1 { argscope . define ( va_name . clone ( ) , & args . only_named ( va_name ) . unwrap_or_else ( | | args . into ( ) ) , ) ; } else { args . check_no_named ( ) ? ; } 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
&self
scope
ScopeRef
args
css::CallArgs