python_ast/ast/tree/
if_exp.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, PyAttributeExtractor
9};
10
11#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
12pub struct IfExp {
13    pub test: Box<ExprType>,
14    pub body: Box<ExprType>,
15    pub orelse: Box<ExprType>,
16    pub lineno: Option<usize>,
17    pub col_offset: Option<usize>,
18    pub end_lineno: Option<usize>,
19    pub end_col_offset: Option<usize>,
20}
21
22impl<'a> FromPyObject<'a> for IfExp {
23    fn extract_bound(ob: &Bound<'a, PyAny>) -> PyResult<Self> {
24        let test = ob.extract_attr_with_context("test", "if expression test")?;
25        let body = ob.extract_attr_with_context("body", "if expression body")?;
26        let orelse = ob.extract_attr_with_context("orelse", "if expression orelse")?;
27        
28        let test = test.extract().expect("getting if expression test");
29        let body = body.extract().expect("getting if expression body");
30        let orelse = orelse.extract().expect("getting if expression orelse");
31        
32        Ok(IfExp {
33            test: Box::new(test),
34            body: Box::new(body),
35            orelse: Box::new(orelse),
36            lineno: ob.lineno(),
37            col_offset: ob.col_offset(),
38            end_lineno: ob.end_lineno(),
39            end_col_offset: ob.end_col_offset(),
40        })
41    }
42}
43
44impl_node_with_positions!(IfExp { lineno, col_offset, end_lineno, end_col_offset });
45
46impl CodeGen for IfExp {
47    type Context = CodeGenContext;
48    type Options = PythonOptions;
49    type SymbolTable = SymbolTableScopes;
50
51    fn to_rust(
52        self,
53        ctx: Self::Context,
54        options: Self::Options,
55        symbols: Self::SymbolTable,
56    ) -> Result<TokenStream, Box<dyn std::error::Error>> {
57        let test = self.test.to_rust(ctx.clone(), options.clone(), symbols.clone())?;
58        let body = self.body.to_rust(ctx.clone(), options.clone(), symbols.clone())?;
59        let orelse = self.orelse.to_rust(ctx, options, symbols)?;
60        
61        Ok(quote! {
62            if #test { #body } else { #orelse }
63        })
64    }
65}
66
67#[cfg(test)]
68mod tests {
69    use super::*;
70    use crate::create_parse_test;
71
72    create_parse_test!(test_if_expression, "x if condition else y", "if_exp_test.py");
73    create_parse_test!(test_nested_if_expression, "a if b else c if d else e", "if_exp_test.py");
74}
python_ast/ast/tree/if_exp.rs

python_ast/ast/tree/
if_exp.rs
