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use crate::*;
use std::collections::HashMap;
pub struct Environment {
pub scopes: Vec<Scope>,
}
impl Environment {
pub fn get_integer(&self, name: &str) -> Result<usize, ()> {
for scope in self.scopes.iter().rev() {
if let Ok(value) = scope.get_integer(name, &self) {
return Ok(value);
}
}
return Err(());
}
pub fn get_block(&self, name: &str) -> Result<usize, ()> {
for scope in self.scopes.iter().rev() {
if let Ok(value) = scope.get_block(name, &self) {
return Ok(value);
}
}
return Err(());
}
}
pub struct Scope {
pub definitions: HashMap<String, Definition>,
}
impl Scope {
pub fn get_integer(&self, name: &str, environment: &Environment) -> Result<usize, ()> {
use IntegerDefinition as IntDef;
if let Some(definition) = self.definitions.get(name) {
if let Definition::Integer(integer) = definition {
match integer {
IntDef::Literal(value) => return Ok(*value),
IntDef::ConstantExpression(expr) => match expr.evaluate(environment) {
Ok(_) | Err(_) => todo!(),
},
};
}
}
return Err(());
}
pub fn get_block(&self, _name: &str, _environment: &Environment) -> Result<usize, ()> {
todo!()
}
}
pub enum Definition {
Integer(IntegerDefinition),
Block(BlockLiteral),
}
pub enum IntegerDefinition {
Literal(usize),
ConstantExpression(ConstantExpression),
}
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