nushell/crates/nu-protocol/src/ast/call.rs

use super::Expression;
use crate::{DeclId, Span};

#[derive(Debug, Clone)]
pub struct Call {
    /// identifier of the declaration to call
    pub decl_id: DeclId,
    pub head: Span,
    pub positional: Vec<Expression>,
    pub named: Vec<(String, Option<Expression>)>,
}

impl Default for Call {
    fn default() -> Self {
        Self::new()
    }
}

impl Call {
    pub fn new() -> Call {
        Self {
            decl_id: 0,
            head: Span::unknown(),
            positional: vec![],
            named: vec![],
        }
    }

    pub fn has_flag(&self, flag_name: &str) -> bool {
        for name in &self.named {
            if flag_name == name.0 {
                return true;
            }
        }

        false
    }

    pub fn get_flag_expr(&self, flag_name: &str) -> Option<Expression> {
        for name in &self.named {
            if flag_name == name.0 {
                return name.1.clone();
            }
        }

        None
    }

    pub fn nth(&self, pos: usize) -> Option<Expression> {
        self.positional.get(pos).cloned()
    }
}