73 lines
1.9 KiB
Rust
73 lines
1.9 KiB
Rust
use std::fmt::{self, Display, Formatter};
|
|
|
|
use serde::{Deserialize, Serialize};
|
|
|
|
use crate::{AbstractTree, Error, Format, Map, Result, SyntaxNode, Type, Value};
|
|
|
|
/// A string by which a variable is known to a context.
|
|
///
|
|
/// Every variable is a key-value pair. An identifier holds the key part of that
|
|
/// pair. Its inner value can be used to retrieve a Value instance from a Map.
|
|
#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
|
|
pub struct Identifier(String);
|
|
|
|
impl Identifier {
|
|
pub fn new<T: Into<String>>(inner: T) -> Self {
|
|
Identifier(inner.into())
|
|
}
|
|
|
|
pub fn take_inner(self) -> String {
|
|
self.0
|
|
}
|
|
|
|
pub fn inner(&self) -> &String {
|
|
&self.0
|
|
}
|
|
}
|
|
|
|
impl AbstractTree for Identifier {
|
|
fn from_syntax(node: SyntaxNode, source: &str, _context: &Map) -> Result<Self> {
|
|
Error::expect_syntax_node(source, "identifier", node)?;
|
|
|
|
let text = &source[node.byte_range()];
|
|
|
|
debug_assert!(!text.is_empty());
|
|
|
|
Ok(Identifier(text.to_string()))
|
|
}
|
|
|
|
fn run(&self, _source: &str, context: &Map) -> Result<Value> {
|
|
if let Some((value, _)) = context.variables()?.get(&self.0) {
|
|
Ok(value.clone())
|
|
} else {
|
|
Err(Error::VariableIdentifierNotFound(self.0.clone()))
|
|
}
|
|
}
|
|
|
|
fn check_type(&self, _source: &str, _context: &Map) -> Result<()> {
|
|
Ok(())
|
|
}
|
|
|
|
fn expected_type(&self, context: &Map) -> Result<Type> {
|
|
if let Some((_value, r#type)) = context.variables()?.get(&self.0) {
|
|
println!("{_value} {}", r#type);
|
|
|
|
Ok(r#type.clone())
|
|
} else {
|
|
Err(Error::VariableIdentifierNotFound(self.0.clone()))
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Format for Identifier {
|
|
fn format(&self, output: &mut String, _indent_level: u8) {
|
|
output.push_str(&self.0);
|
|
}
|
|
}
|
|
|
|
impl Display for Identifier {
|
|
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
|
|
write!(f, "{}", self.0)
|
|
}
|
|
}
|