Method describe

core/src/callable.rs:206–236

Formats the repeated argument syntax for help purposes into `output`. `last_singular_sep` contains the separator of the last singular argument syntax, if any, which we need to place inside of the optional group.

(&self, output: &mut String, last_singular_sep: Option<&ArgSepSyntax>)

    /// `last_singular_sep` contains the separator of the last singular argument syntax, if any,
    /// which we need to place inside of the optional group.
    fn describe(&self, output: &mut String, last_singular_sep: Option<&ArgSepSyntax>) {
        if !self.require_one {
            output.push('[');
        }

        if let Some(sep) = last_singular_sep {
            sep.describe(output);
        }

        output.push_str(&self.name);
        output.push('1');
        if let RepeatedTypeSyntax::TypedValue(vtype) = self.type_syn {
            output.push(vtype.annotation());
        }

        if self.require_one {
            output.push('[');
        }

        self.sep.describe(output);
        output.push_str("..");
        self.sep.describe(output);

        output.push_str(&self.name);
        output.push('N');
        if let RepeatedTypeSyntax::TypedValue(vtype) = self.type_syn {
            output.push(vtype.annotation());
        }

        output.push(']');
    }
}

/// Syntax specification for a parameter that accepts any scalar type.