101 lines
3.2 KiB
Rust
101 lines
3.2 KiB
Rust
use std::sync::RwLock;
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use rayon::prelude::*;
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use serde::{Deserialize, Serialize};
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use tree_sitter::Node;
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use crate::{AbstractTree, Error, Map, Result, Statement, Type, Value};
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/// Abstract representation of a block.
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///
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/// A block is almost identical to the root except that it must have curly
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/// braces and can optionally be asynchronous. A block evaluates to the value of
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/// its final statement but an async block will short-circuit if a statement
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/// results in an error. Note that this will be the first statement to encounter
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/// an error at runtime, not necessarilly the first statement as they are
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/// written.
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#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
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pub struct Block {
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is_async: bool,
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statements: Vec<Statement>,
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}
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impl AbstractTree for Block {
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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, "block", node)?;
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let first_child = node.child(0).unwrap();
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let is_async = first_child.kind() == "async";
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let statement_count = if is_async {
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node.child_count() - 3
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} else {
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node.child_count() - 2
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};
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let mut statements = Vec::with_capacity(statement_count);
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for index in 1..node.child_count() - 1 {
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let child_node = node.child(index).unwrap();
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if child_node.is_named() {
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let statement = Statement::from_syntax_node(source, child_node, context)?;
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statements.push(statement);
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}
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}
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Ok(Block {
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is_async,
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statements,
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})
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}
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fn run(&self, source: &str, context: &Map) -> Result<Value> {
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if self.is_async {
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let statements = &self.statements;
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let final_result = RwLock::new(Ok(Value::Empty));
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statements
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.into_par_iter()
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.enumerate()
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.find_map_first(|(index, statement)| {
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if let Statement::Return(expression) = statement {
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return Some(expression.run(source, &mut context.clone()));
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}
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let result = statement.run(source, &mut context.clone());
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if result.is_err() {
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Some(result)
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} else if index == statements.len() - 1 {
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let _ = final_result.write().unwrap().as_mut().map(|_| result);
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None
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} else {
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None
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}
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})
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.unwrap_or(final_result.into_inner().unwrap())
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} else {
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let mut prev_result = None;
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for statement in &self.statements {
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if let Statement::Return(expression) = statement {
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return expression.run(source, context);
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}
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prev_result = Some(statement.run(source, context));
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}
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prev_result.unwrap_or(Ok(Value::Empty))
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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 self.is_async {
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Ok(Type::Any)
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} else {
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self.statements.last().unwrap().expected_type(context)
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}
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}
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}
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