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use std::collections::HashMap;
use var::Var;
use eval::Eval;
/// Def alias used for internal evaluation purposes
pub type Def = HashMap<String, DefBlock>;
#[derive(Debug,PartialEq,Clone)]
pub struct DefBlock {
pub name: String,
pub data: HashMap<String,Var>
}
impl DefBlock {
pub fn new(name: &str) -> DefBlock {
DefBlock {
name: name.to_owned(),
data: HashMap::new()
}
}
}
impl Eval for Def {
fn get (&self, path: Option<Vec<&str>>, lookup: &str) -> Option<Var> {
if let Some(path) = path {
if let Some(ref def) = self.get(path[0]) {
if let Some(v) = def.data.get(lookup) {
return Some(v.clone())
}
}
}
None
}
fn get_last (&self, lookup: &str) -> Option<(Var, bool)> {
let mut lookup = lookup;
let mut resolved = None;
loop { // resolve symbol references
let (path,sym) = self.as_path(lookup);
if let Some(mut path) = path {
// NOTE: for now we are using nested paths as actual names
// so we need to rebuild it as a full name if necessary
let mut p = String::new();
if path.len() > 1 {
p.push_str(path.remove(0));
p.push('.');
p.push_str(path.remove(0));
}
let path_final = {
if p.is_empty() { path[0] }
else { &p }
};
if let Some(ref def) = self.get(path_final) {
if let Some(v) = def.data.get(sym) {
match v {
&Var::Sym(ref sym) => {
if lookup != sym {
resolved = Some(v.clone()); // take note that we resolved atleast once
lookup = sym;
continue
}
else {
return Some((v.clone(), false))
}
},
_ => {
return Some((v.clone(), true))
}
}
}
else { break }
}
else { break }
}
else { break }
}
if let Some(v) = resolved { return Some((v, false)) }
None
}
#[allow(unused_variables)]
fn set (&mut self, path: Option<Vec<&str>>, lookup: &str, var: Var) {
if let Some(mut path) = path {
// NOTE: for now we are using nested paths as actual names
// so we need to rebuild it as a full name if necessary
let mut p = String::new();
let mut block_name = String::new();
if path.len() > 1 {
p.push_str(path.remove(0));
p.push('.');
let n = path.remove(0);
block_name.push_str(&n);
p.push_str(n);
}
let path_final = {
if p.is_empty() { path[0] }
else { &p }
};
if let Some(ref mut def) = self.get_mut(path_final) {
let set;
if let Some(v) = def.data.get_mut(lookup) {
*v = var;
set = None;
}
else { set = Some(var); }
if let Some(var) = set { // NOTE: we're building this from scratch, this should be considered explicit instead
def.data.insert(lookup.to_owned(), var);
}
return
}
// if we didn't successfully insert, let's build from scratch the new block path
let mut map = HashMap::new();
map.insert(lookup.to_owned(), var);
let def = DefBlock {
name: block_name,
data: map,
};
self.insert(path_final.to_owned(), def);
}
}
#[allow(unused_variables)]
fn call (&mut self, var: Var, fun: &str, vars: &Vec<Var>) -> Option<Var> {
None
}
}