python_ast/ast/tree/
if_exp.rs

1use proc_macro2::TokenStream;
2use pyo3::{Borrowed, FromPyObject, PyAny, PyResult, types::PyAnyMethods};
3use quote::quote;
4use serde::{Deserialize, Serialize};
5
6use crate::{extraction_failure, 
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, 'py> FromPyObject<'a, 'py> for IfExp {
23    type Error = pyo3::PyErr;
24    fn extract(ob: Borrowed<'a, 'py, PyAny>) -> PyResult<Self> {
25        let test = ob.extract_attr_with_context("test", "if expression test")?;
26        let body = ob.extract_attr_with_context("body", "if expression body")?;
27        let orelse = ob.extract_attr_with_context("orelse", "if expression orelse")?;
28        
29        let test = test.extract().map_err(|e| extraction_failure("getting if expression test", &ob, e))?;
30        let body = body.extract().map_err(|e| extraction_failure("getting if expression body", &ob, e))?;
31        let orelse = orelse.extract().map_err(|e| extraction_failure("getting if expression orelse", &ob, e))?;
32        
33        Ok(IfExp {
34            test: Box::new(test),
35            body: Box::new(body),
36            orelse: Box::new(orelse),
37            lineno: ob.lineno(),
38            col_offset: ob.col_offset(),
39            end_lineno: ob.end_lineno(),
40            end_col_offset: ob.end_col_offset(),
41        })
42    }
43}
44
45impl_node_with_positions!(IfExp { lineno, col_offset, end_lineno, end_col_offset });
46
47impl CodeGen for IfExp {
48    type Context = CodeGenContext;
49    type Options = PythonOptions;
50    type SymbolTable = SymbolTableScopes;
51
52    fn to_rust(
53        self,
54        ctx: Self::Context,
55        options: Self::Options,
56        symbols: Self::SymbolTable,
57    ) -> Result<TokenStream, Box<dyn std::error::Error>> {
58        let test =
59            crate::condition_to_rust(&self.test, ctx.clone(), options.clone(), symbols.clone())?;
60        let body = self.body.to_rust(ctx.clone(), options.clone(), symbols.clone())?;
61        let orelse = self.orelse.to_rust(ctx, options, symbols)?;
62        
63        Ok(quote! {
64            if #test { #body } else { #orelse }
65        })
66    }
67}
68
69#[cfg(test)]
70mod tests {
71    use super::*;
72    use crate::create_parse_test;
73
74    create_parse_test!(test_if_expression, "x if condition else y", "if_exp_test.py");
75    create_parse_test!(test_nested_if_expression, "a if b else c if d else e", "if_exp_test.py");
76}
python_ast/ast/tree/if_exp.rs

python_ast/ast/tree/
if_exp.rs
