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use crate::instruction::PString;
use std::collections::HashMap;
const GLOBAL_CONTEXT: &str = "Global";
#[derive(Debug)]
pub struct PValue {
pub node: PString,
pub value: usize,
pub label: bool,
}
#[derive(Debug)]
pub struct Context {
stack: Vec<String>,
map: HashMap<String, HashMap<String, PValue>>,
}
impl Default for Context {
fn default() -> Self {
Context::new()
}
}
impl Context {
pub fn new() -> Self {
Context {
stack: vec![],
map: HashMap::from([(String::from(GLOBAL_CONTEXT), HashMap::new())]),
}
}
pub fn reset(&mut self) {
self.stack = vec![];
}
pub fn find(&self, name: &str) -> Option<&HashMap<String, PValue>> {
self.map.get(name)
}
pub fn current(&self) -> Option<&HashMap<String, PValue>> {
match self.stack.last() {
Some(name) => self.map.get(name),
None => self.map.get(GLOBAL_CONTEXT),
}
}
pub fn current_mut(&mut self) -> Option<&mut HashMap<String, PValue>> {
match self.stack.last() {
Some(name) => self.map.get_mut(name),
None => self.map.get_mut(GLOBAL_CONTEXT),
}
}
pub fn push(&mut self, identifier: &String) {
let name = match self.stack.last() {
Some(n) => n.to_owned() + &String::from("::") + identifier,
None => identifier.to_string(),
};
self.stack.push(name.clone());
self.map.entry(name).or_default();
}
pub fn pop(&mut self) -> bool {
if self.stack.is_empty() {
return false;
}
self.stack.truncate(self.stack.len() - 1);
true
}
}
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