dust/src/abstract_tree/function_call.rs
2023-10-13 15:48:48 -04:00

88 lines
2.7 KiB
Rust

use serde::{Deserialize, Serialize};
use tree_sitter::Node;
use crate::{tool::Tool, AbstractTree, Result, Value, VariableMap};
use super::{expression::Expression, identifier::Identifier};
#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
pub struct FunctionCall {
name: FunctionName,
arguments: Vec<Expression>,
}
#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
pub enum FunctionName {
Identifier(Identifier),
Tool(Tool),
}
impl AbstractTree for FunctionCall {
fn from_syntax_node(source: &str, node: Node) -> Result<Self> {
debug_assert_eq!("function_call", node.kind());
let name_node = node.child(1).unwrap();
let name = match name_node.kind() {
"identifier" => {
FunctionName::Identifier(Identifier::from_syntax_node(source, name_node)?)
}
"tool" => {
let tool_node = name_node.child(0).unwrap();
let tool = Tool::new(tool_node.kind())?;
FunctionName::Tool(tool)
}
_ => panic!(""),
};
let mut arguments = Vec::new();
for index in 2..node.child_count() - 1 {
let child = node.child(index).unwrap();
if child.is_named() {
let expression = Expression::from_syntax_node(source, child)?;
arguments.push(expression);
}
}
Ok(FunctionCall { name, arguments })
}
fn run(&self, source: &str, context: &mut VariableMap) -> Result<Value> {
let identifier = match &self.name {
FunctionName::Identifier(identifier) => identifier,
FunctionName::Tool(tool) => {
let mut values = Vec::with_capacity(self.arguments.len());
for expression in &self.arguments {
let value = expression.run(source, context)?;
values.push(value);
}
return tool.run(&values);
}
};
let key = identifier.inner();
let definition = if let Some(value) = context.get_value(key)? {
value.as_function().cloned()?
} else {
return Err(crate::Error::FunctionIdentifierNotFound(identifier.clone()));
};
let id_expr_pairs = definition.identifiers().iter().zip(self.arguments.iter());
let mut function_context = context.clone();
for (identifier, expression) in id_expr_pairs {
let key = identifier.inner().clone();
let value = expression.run(source, context)?;
function_context.set_value(key, value)?;
}
definition.body().run(source, &mut function_context)
}
}