115 lines
3.2 KiB
Rust
115 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, Error, Identifier, Map, Result, TypeDefinition, Value, BUILT_IN_FUNCTIONS,
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};
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use super::expression::Expression;
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#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
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pub struct FunctionCall {
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function_name: Identifier,
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arguments: Vec<Expression>,
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}
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impl FunctionCall {
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pub fn new(function_name: Identifier, arguments: Vec<Expression>) -> Self {
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Self {
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function_name,
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arguments,
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}
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}
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}
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impl AbstractTree for FunctionCall {
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fn from_syntax_node(source: &str, node: Node, context: &Map) -> Result<Self> {
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debug_assert_eq!("function_call", node.kind());
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let identifier_node = node.child(1).unwrap();
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let function_name = Identifier::from_syntax_node(source, identifier_node, context)?;
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let mut arguments = Vec::new();
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for index in 2..node.child_count() - 1 {
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let child = node.child(index).unwrap();
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if child.is_named() {
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let expression = Expression::from_syntax_node(source, child, context)?;
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arguments.push(expression);
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}
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}
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Ok(FunctionCall {
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function_name,
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arguments,
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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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let key = self.function_name.inner();
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for built_in_function in BUILT_IN_FUNCTIONS {
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if key == built_in_function.name() {
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let mut arguments = Vec::with_capacity(self.arguments.len());
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for expression in &self.arguments {
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let value = expression.run(source, context)?;
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arguments.push(value);
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}
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return built_in_function.run(&arguments, context);
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}
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}
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let variables = context.variables()?;
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let function = if let Some(value) = variables.get(key) {
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value.as_function()?
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} else {
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return Err(Error::FunctionIdentifierNotFound(
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self.function_name.clone(),
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));
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};
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let mut function_context = Map::clone_from(context)?;
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let parameter_expression_pairs = function.parameters().iter().zip(self.arguments.iter());
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for ((identifier, _type), expression) in parameter_expression_pairs {
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let key = identifier.clone().take_inner();
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let value = expression.run(source, context)?;
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function_context.variables_mut()?.insert(key, value);
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}
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function.body().run(source, &mut function_context)
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}
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fn expected_type(&self, context: &Map) -> Result<TypeDefinition> {
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self.function_name.expected_type(context)
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}
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}
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#[cfg(test)]
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mod tests {
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use crate::{evaluate, Value};
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#[test]
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fn evaluate_function_call() {
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assert_eq!(
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evaluate(
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"
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foobar <fn str -> str> |message| { message }
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(foobar 'Hiya')
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",
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),
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Ok(Value::String("Hiya".to_string()))
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);
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}
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#[test]
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fn evaluate_built_in_function_call() {
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assert_eq!(evaluate("(output 'Hiya')"), Ok(Value::Empty));
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}
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}
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