tseeker-pub/rust-crafting-interpreters-part-1
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Interpreter - Variable assignment

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This commit is contained in:
Emmanuel BENOîT 2022-12-31 16:36:29 +01:00
parent 8d6191c7ee
commit f4111577ca
2 changed files with 7 additions and 3 deletions
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6
src/interpreter/environment.rs
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@ -28,10 +28,10 @@ impl Environment {
} }
/// Assign a value to an existing variable. /// Assign a value to an existing variable.
pub fn assign(&mut self, name: &Token, value: &Value) -> Result<(), InterpreterError> { pub fn assign(&mut self, name: &Token, value: Value) -> InterpreterResult {
if self.values.contains_key(&name.lexeme as &str) { if self.values.contains_key(&name.lexeme as &str) {
self.values.insert(name.lexeme.clone(), value.clone()); self.values.insert(name.lexeme.clone(), value);
Ok(()) Ok(Value::Nil)
} else { } else {
Err(InterpreterError::new( Err(InterpreterError::new(
name, name,

4
src/interpreter/interpretable.rs
View file

@ -92,6 +92,10 @@ impl ast::StmtNode {
impl Interpretable for ast::ExprNode { impl Interpretable for ast::ExprNode {
fn interprete(&self, environment: &mut Environment) -> InterpreterResult { fn interprete(&self, environment: &mut Environment) -> InterpreterResult {
match self { match self {
ast::ExprNode::Assignment{ name, value} => {
let value = value.interprete(environment)?;
environment.assign(name, value)
}
ast::ExprNode::Binary { ast::ExprNode::Binary {
left, left,
operator, operator,