use serde::{Deserialize, Serialize}; use tree_sitter::Node; use crate::{AbstractTree, BuiltInFunction, Error, Map, Result, Value}; use super::{expression::Expression, identifier::Identifier}; #[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)] pub enum FunctionCall { BuiltIn(Box), ContextDefined { name: Identifier, arguments: Vec, }, } impl AbstractTree for FunctionCall { fn from_syntax_node(source: &str, node: Node) -> Result { debug_assert_eq!("function_call", node.kind()); let function_node = node.child(1).unwrap(); let mut arguments = Vec::new(); for index in 2..node.child_count() - 1 { let node = node.child(index).unwrap(); if node.is_named() { let expression = Expression::from_syntax_node(source, node)?; arguments.push(expression); } } let function_call = if function_node.kind() == "built_in_function" { let function = BuiltInFunction::from_syntax_node(source, function_node)?; FunctionCall::BuiltIn(Box::new(function)) } else { let identifier = Identifier::from_syntax_node(source, function_node)?; FunctionCall::ContextDefined { name: identifier, arguments, } }; Ok(function_call) } fn run(&self, source: &str, context: &mut Map) -> Result { let (name, arguments) = match self { FunctionCall::BuiltIn(function) => return function.run(source, context), FunctionCall::ContextDefined { name, arguments } => (name, arguments), }; let definition = if let Some(value) = context.variables()?.get(name.inner()) { value.as_function().cloned()? } else { return Err(Error::FunctionIdentifierNotFound(name.clone())); }; let mut function_context = Map::clone_from(context)?; if let Some(parameters) = definition.identifiers() { let parameter_expression_pairs = parameters.iter().zip(arguments.iter()); let mut variables = function_context.variables_mut()?; for (identifier, expression) in parameter_expression_pairs { let key = identifier.clone().take_inner(); let value = expression.run(source, context)?; variables.insert(key, value); } } definition.body().run(source, &mut function_context) } }