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foliage-rs
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Remove variable declaration stack

This commit is contained in:
Patrick Lühne 2020-02-05 02:27:00 +01:00
parent e335ab5e4f
commit 75356d2972
Signed by: patrick
GPG Key ID: 05F3611E97A70ABF
1 changed files with 0 additions and 65 deletions
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65
src/ast.rs
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@ -128,71 +128,6 @@ impl VariableDeclaration
pub type VariableDeclarations = Vec<std::rc::Rc<VariableDeclaration>>;
pub struct VariableDeclarationStack
{
pub free_variable_declarations: VariableDeclarations,
bound_variable_declaration_stack: Vec<std::rc::Rc<VariableDeclarations>>,
}
impl VariableDeclarationStack
{
pub fn new() -> Self
{
Self
{
free_variable_declarations: VariableDeclarations::new(),
bound_variable_declaration_stack: vec![],
}
}
pub fn find(&self, variable_name: &str) -> Option<std::rc::Rc<VariableDeclaration>>
{
for variable_declarations in self.bound_variable_declaration_stack.iter().rev()
{
if let Some(variable_declaration) = variable_declarations.iter().find(|x| x.name == variable_name)
{
return Some(std::rc::Rc::clone(&variable_declaration));
}
}
if let Some(variable_declaration) = self.free_variable_declarations.iter().find(|x| x.name == variable_name)
{
return Some(std::rc::Rc::clone(&variable_declaration));
}
None
}
pub fn find_or_create(&mut self, variable_name: &str) -> std::rc::Rc<VariableDeclaration>
{
if let Some(variable_declaration) = self.find(variable_name)
{
return variable_declaration;
}
let variable_declaration = VariableDeclaration
{
name: variable_name.to_owned(),
};
let variable_declaration = std::rc::Rc::new(variable_declaration);
self.free_variable_declarations.push(std::rc::Rc::clone(&variable_declaration));
variable_declaration
}
pub fn push(&mut self, bound_variable_declarations: std::rc::Rc<VariableDeclarations>)
{
self.bound_variable_declaration_stack.push(bound_variable_declarations);
}
pub fn pop(&mut self)
{
// TODO: return error instead
self.bound_variable_declaration_stack.pop().expect("bound variable is empty, cannot pop last element");
}
}
// Terms
pub struct BinaryOperation