89 lines
2.3 KiB
Rust
89 lines
2.3 KiB
Rust
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use std::{
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collections::HashMap,
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sync::{Arc, RwLock, RwLockReadGuard},
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};
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use crate::{error::rw_lock_error::RwLockError, Type, Value};
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#[derive(Clone)]
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pub enum ValueData {
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Value {
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inner: Value,
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runtime_uses: Arc<RwLock<u16>>,
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},
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ExpectedType {
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inner: Type,
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},
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}
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pub struct Context {
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inner: Arc<RwLock<HashMap<String, ValueData>>>,
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}
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impl Context {
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pub fn new() -> Self {
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Self {
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inner: Arc::new(RwLock::new(HashMap::new())),
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}
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}
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pub fn inherit_from(other: &Context) -> Result<Context, RwLockError> {
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let mut new_variables = HashMap::new();
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for (identifier, value_data) in other.variables()?.iter() {
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new_variables.insert(identifier.clone(), value_data.clone());
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}
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Ok(Context {
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inner: Arc::new(RwLock::new(new_variables)),
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})
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}
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pub fn variables(&self) -> Result<RwLockReadGuard<HashMap<String, ValueData>>, RwLockError> {
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Ok(self.inner.read()?)
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}
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pub fn get_value(&self, key: &str) -> Result<Option<&Value>, RwLockError> {
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if let Some(value_data) = self.inner.read()?.get(key) {
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if let ValueData::Value { inner, .. } = value_data {
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Ok(Some(inner))
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} else {
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Ok(None)
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}
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} else {
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Ok(None)
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}
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}
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pub fn get_type(&self, key: &str) -> Result<Option<Type>, RwLockError> {
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if let Some(value_data) = self.inner.read()?.get(key) {
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match value_data {
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ValueData::Value { inner, .. } => Ok(Some(inner.r#type())),
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ValueData::ExpectedType { inner, .. } => Ok(Some(inner.clone())),
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}
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} else {
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Ok(None)
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}
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}
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pub fn set_value(&self, key: String, value: Value) -> Result<(), RwLockError> {
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self.inner.write()?.insert(
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key,
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ValueData::Value {
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inner: value,
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runtime_uses: Arc::new(RwLock::new(0)),
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},
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);
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Ok(())
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}
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pub fn set_type(&self, key: String, r#type: Type) -> Result<(), RwLockError> {
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self.inner
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.write()?
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.insert(key, ValueData::ExpectedType { inner: r#type });
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Ok(())
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}
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}
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