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