python_ast/ast/tree/
lambda.rs

1use proc_macro2::TokenStream;
2use pyo3::{Bound, FromPyObject, PyAny, PyResult, types::PyAnyMethods};
3use quote::quote;
4use serde::{Deserialize, Serialize};
5
6use crate::{
7    CodeGen, CodeGenContext, ExprType, PythonOptions, SymbolTableScopes,
8    Node, impl_node_with_positions, ParameterList, PyAttributeExtractor
9};
10
11#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
12pub struct Lambda {
13    pub args: ParameterList,
14    pub body: Box<ExprType>,
15    pub lineno: Option<usize>,
16    pub col_offset: Option<usize>,
17    pub end_lineno: Option<usize>,
18    pub end_col_offset: Option<usize>,
19}
20
21impl<'a> FromPyObject<'a> for Lambda {
22    fn extract_bound(ob: &Bound<'a, PyAny>) -> PyResult<Self> {
23        let args = ob.extract_attr_with_context("args", "lambda arguments")?;
24        let body = ob.extract_attr_with_context("body", "lambda body")?;
25        
26        let args = args.extract().expect("getting lambda arguments");
27        let body = body.extract().expect("getting lambda body");
28        
29        Ok(Lambda {
30            args,
31            body: Box::new(body),
32            lineno: ob.lineno(),
33            col_offset: ob.col_offset(),
34            end_lineno: ob.end_lineno(),
35            end_col_offset: ob.end_col_offset(),
36        })
37    }
38}
39
40impl_node_with_positions!(Lambda { lineno, col_offset, end_lineno, end_col_offset });
41
42impl CodeGen for Lambda {
43    type Context = CodeGenContext;
44    type Options = PythonOptions;
45    type SymbolTable = SymbolTableScopes;
46
47    fn to_rust(
48        self,
49        ctx: Self::Context,
50        options: Self::Options,
51        symbols: Self::SymbolTable,
52    ) -> Result<TokenStream, Box<dyn std::error::Error>> {
53        let args = self.args.to_rust(ctx.clone(), options.clone(), symbols.clone())?;
54        let body = self.body.to_rust(ctx, options, symbols)?;
55        
56        Ok(quote! {
57            |#args| #body
58        })
59    }
60}
61
62#[cfg(test)]
63mod tests {
64    use super::*;
65    use crate::create_parse_test;
66
67    create_parse_test!(test_simple_lambda, "lambda x: x + 1", "lambda_test.py");
68    create_parse_test!(test_lambda_with_args, "lambda x, y: x * y", "lambda_test.py");
69    create_parse_test!(test_lambda_no_args, "lambda: 42", "lambda_test.py");
70}
python_ast/ast/tree/lambda.rs

python_ast/ast/tree/
lambda.rs
