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|
use std::collections::HashMap;
use crate::{Identifier,IdentifierValue};
pub type Context = HashMap<String,Value>;
pub trait MappedStructure {
fn get_value(&self, id: &[IdentifierValue]) -> Option<Value>;
}
impl MappedStructure for Context {
fn get_value(&self, id: &[IdentifierValue]) -> Option<Value> {
if id.len() == 0 {
return None;
}
let mut cur_val : Option<&Value> = if let IdentifierValue::Name(s) = &id[0] {
self.get(s)
} else {
return None;
};
if cur_val.is_none() {
return None;
}
for idx in 1..id.len() {
if let IdentifierValue::Name(s) = &id[idx] &&
let Some(Value::Dictionary(d)) = &cur_val {
cur_val.replace( if let Some(v) = d.get(s) {
v
} else {
return None;
});
}
}
return cur_val.cloned();
}
}
pub struct StatefulContext<'a, T: MappedStructure> {
root: &'a T,
current: &'a T,
}
impl<'a, T: MappedStructure> StatefulContext<'a, T> {
pub fn root( root: &'a T ) -> Self {
Self {
root, current: root,
}
}
pub fn local(&self, current: &'a T ) -> Self {
Self {
root: self.root,
current
}
}
}
impl<'a, T: MappedStructure> MappedStructure for StatefulContext<'a,T> {
fn get_value(&self, id: &[IdentifierValue]) -> Option<Value> {
if id.is_empty() {
return None;
}
if id[0] == IdentifierValue::Root {
self.root.get_value( &id[1..] )
} else {
self.current.get_value( id )
}
}
}
#[derive(Debug,Clone)]
pub enum Value {
Dictionary(Context),
List(Vec<Value>),
String(String),
Int(i64),
Float(f64),
Bool(bool),
Identifier(Identifier),
}
impl From<&str> for Value {
fn from(val: &str ) -> Value {
Value::String(val.into())
}
}
impl From<String> for Value {
fn from(val: String) -> Value {
Value::String(val)
}
}
impl From<i64> for Value {
fn from(val: i64) -> Value {
Value::Int(val)
}
}
impl From<f64> for Value {
fn from(val: f64) -> Value {
Value::Float(val)
}
}
impl From<bool> for Value {
fn from(val: bool) -> Value {
Value::Bool(val)
}
}
impl From<Vec<Value>> for Value {
fn from(val: Vec<Value>) -> Value {
Value::List(val)
}
}
impl From<&[Value]> for Value {
fn from(val: &[Value]) -> Value {
Value::List(Vec::from(val))
}
}
impl From<Context> for Value {
fn from(val: Context) -> Value {
Value::Dictionary(val)
}
}
impl<const N: usize> From<[(String,Value); N]> for Value {
fn from(val: [(String,Value); N]) -> Value {
Value::Dictionary(HashMap::from(val))
}
}
/*
impl MappedStructure for Value {
fn get_value(&self, id: &Identifier) -> Option<Value> {
if id.len() == 0 {
return Some(self);
}
match Value {
Value::Dictionary(dict) => {
}
}
let mut cur_val : Option<&Value> = Some(&self);
for idx in 0..id.len() {
if let IdentifierValue::Name(s) = &id[idx] &&
let Some(Value::Dictionary(d)) = &cur_val {
cur_val.replace( if let Some(v) = d.get(s) {
v
} else {
return None;
});
}
}
return cur_val.cloned();
}
}
*/
|
