83 lines
3.2 KiB
Rust
83 lines
3.2 KiB
Rust
use serde::{Deserialize, Serialize};
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use tree_sitter::Node;
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use crate::{
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AbstractTree, Assignment, Async, Error, Expression, Filter, For, IfElse, Match, Result,
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Transform, Value, VariableMap, While,
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};
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/// Abstract representation of a statement.
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///
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/// A statement may evaluate to an Empty value when run. If a Statement is an
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/// Expression, it will always return a non-empty value when run.
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#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
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pub enum Statement {
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Assignment(Box<Assignment>),
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Expression(Expression),
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IfElse(Box<IfElse>),
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Match(Match),
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While(Box<While>),
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Async(Box<Async>),
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For(Box<For>),
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Transform(Box<Transform>),
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Filter(Box<Filter>),
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}
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impl AbstractTree for Statement {
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fn from_syntax_node(source: &str, node: Node) -> Result<Self> {
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debug_assert_eq!("statement", node.kind());
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let child = node.child(0).unwrap();
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match child.kind() {
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"assignment" => Ok(Statement::Assignment(Box::new(
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Assignment::from_syntax_node(source, child)?,
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))),
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"expression" => Ok(Self::Expression(Expression::from_syntax_node(
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source, child,
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)?)),
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"if_else" => Ok(Statement::IfElse(Box::new(IfElse::from_syntax_node(
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source, child,
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)?))),
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"tool" => Ok(Statement::IfElse(Box::new(IfElse::from_syntax_node(
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source, child,
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)?))),
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"while" => Ok(Statement::While(Box::new(While::from_syntax_node(
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source, child,
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)?))),
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"async" => Ok(Statement::Async(Box::new(Async::from_syntax_node(
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source, child,
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)?))),
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"for" => Ok(Statement::For(Box::new(For::from_syntax_node(
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source, child,
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)?))),
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"transform" => Ok(Statement::Transform(Box::new(Transform::from_syntax_node(
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source, child,
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)?))),
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"filter" => Ok(Statement::Filter(Box::new(Filter::from_syntax_node(
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source, child,
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)?))),
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_ => Err(Error::UnexpectedSyntaxNode {
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expected: "assignment, expression, if...else, while, for, transform, filter, tool or async",
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actual: child.kind(),
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location: child.start_position(),
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relevant_source: source[child.byte_range()].to_string(),
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}),
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}
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}
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fn run(&self, source: &str, context: &mut VariableMap) -> Result<Value> {
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match self {
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Statement::Assignment(assignment) => assignment.run(source, context),
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Statement::Expression(expression) => expression.run(source, context),
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Statement::IfElse(if_else) => if_else.run(source, context),
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Statement::Match(r#match) => r#match.run(source, context),
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Statement::While(r#while) => r#while.run(source, context),
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Statement::Async(run) => run.run(source, context),
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Statement::For(r#for) => r#for.run(source, context),
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Statement::Transform(transform) => transform.run(source, context),
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Statement::Filter(filter) => filter.run(source, context),
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}
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}
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}
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