minusone 0.3.9

A script deobfuscator
Documentation 
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use std::collections::HashMap;

#[derive(Clone)]
pub struct Variable<T: Clone> {
    inferred_type: Option<T>,
    used: bool,
    local: bool
}

impl<T: Clone> Variable<T> {
    pub fn new(inferred_type: Option<T>) -> Self {
        Variable {
            inferred_type,
            used: false,
            local: true
        }
    }
}

#[derive(Clone)]
pub struct Scope<T: Clone> {
    vars: HashMap<String, Variable<T>>,
}

impl<T: Clone> Scope<T> {
    pub fn new() -> Self {
        Scope {
            vars: HashMap::new(),
        }
    }

    pub fn from(scope: &Scope<T>) -> Self {
        let mut s = Scope {
            vars : scope.vars.clone()
        };
        for (_, var) in s.vars.iter_mut() {
            var.local = false;
        }
        s
    }

    pub fn assign(&mut self, var_name: &str, value: T) {
        if let Some(var_value) = self.vars.get_mut(var_name) {
            var_value.inferred_type = Some(value);
        } else {
            self.vars
                .insert(var_name.to_string(), Variable::new(Some(value)));
        }
    }

    pub fn forget(&mut self, var_name: &str) {
        if let Some(var_value) = self.vars.get_mut(var_name) {
            var_value.inferred_type = None;
        }
    }

    pub fn in_use(&mut self, var_name: &str) {
        if let Some(var_value) = self.vars.get_mut(var_name) {
            var_value.used = true;
        }
    }

    pub fn get_var_mut(&mut self, var_name: &str) -> Option<&mut T> {
        if let Some(data) = self.vars.get_mut(var_name) {
            return data.inferred_type.as_mut();
        }
        None
    }

    pub fn get_var(&self, var_name: &str) -> Option<&T> {
        if let Some(data) = self.vars.get(var_name) {
            return data.inferred_type.as_ref();
        }
        None
    }

    pub fn get_var_names(&self) -> Vec<String> {
        self.vars.clone().keys().map(|k| k.clone()).collect()
    }

    pub fn is_local(&self, var_name: &str) -> Option<bool> {
        if let Some(data) = self.vars.get(var_name) {
            return Some(data.local);
        }
        None
    }
}

pub struct ScopeManager<T: Clone> {
    scopes: Vec<Scope<T>>,
}

impl<T: Clone> ScopeManager<T> {
    pub fn new() -> Self {
        ScopeManager {
            scopes: vec![Scope::new()], // default scope
        }
    }

    pub fn enter(&mut self) {
        self.scopes.push(Scope::from(self.current()))
    }

    pub fn leave(&mut self) {
        let mut last = self.scopes.pop().unwrap();
        // we will merge the scope
        for (name, value) in last.vars.iter_mut() {
                if let Some(inferred_type) = &value.inferred_type {
                    if !value.local {
                        self.current_mut().assign(name, inferred_type.clone());
                    }
                }

        }
    }

    pub fn current_mut(&mut self) -> &mut Scope<T> {
        self.scopes
            .last_mut()
            .expect("It must at least exist a last scope")
    }

    pub fn current(&self) -> &Scope<T> {
        self.scopes
            .last()
            .expect("It must at least exist a last scope")
    }

    pub fn reset(&mut self) {
        self.scopes = vec![Scope::new()]
    }

    pub fn forget_everywhere(&mut self, var_name: &str) {
        for scope in self.scopes.iter_mut() {
            scope.forget(var_name)
        }
    }
}