58 lines
1.6 KiB
Rust
58 lines
1.6 KiB
Rust
use serde::{Deserialize, Serialize};
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use tree_sitter::Node;
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use crate::{AbstractTree, Error, Map, Result, Type, Value, BUILT_IN_FUNCTIONS};
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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(inner: String) -> Self {
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Identifier(inner)
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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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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.inner().clone()))
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}
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}
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fn expected_type(&self, context: &Map) -> Result<Type> {
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if let Some(value) = context.variables()?.get(&self.0) {
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value.r#type(context)
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} else {
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for built_in_function in BUILT_IN_FUNCTIONS {
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if self.0 == built_in_function.name() {
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return Ok(built_in_function.r#type());
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}
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}
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Ok(Type::Any)
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}
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}
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}
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