python_ast/ast/tree/
subscript.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 Subscript {
13    pub value: Box<ExprType>,
14    pub slice: 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 Subscript {
22    fn extract_bound(ob: &Bound<'a, PyAny>) -> PyResult<Self> {
23        let value = ob.extract_attr_with_context("value", "subscript value")?;
24        let slice = ob.extract_attr_with_context("slice", "subscript slice")?;
25        
26        let value = value.extract().expect("getting subscript value");
27        let slice = slice.extract().expect("getting subscript slice");
28        
29        Ok(Subscript {
30            value: Box::new(value),
31            slice: Box::new(slice),
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!(Subscript { lineno, col_offset, end_lineno, end_col_offset });
41
42impl CodeGen for Subscript {
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 value = self.value.to_rust(ctx.clone(), options.clone(), symbols.clone())?;
54        let slice = self.slice.to_rust(ctx, options, symbols)?;
55        
56        Ok(quote! {
57            #value[#slice]
58        })
59    }
60}
61
62#[cfg(test)]
63mod tests {
64    use super::*;
65    use crate::create_parse_test;
66
67    create_parse_test!(test_list_subscript, "a[0]", "subscript_test.py");
68    create_parse_test!(test_dict_subscript, "d['key']", "subscript_test.py");
69    create_parse_test!(test_nested_subscript, "matrix[i][j]", "subscript_test.py");
70}
python_ast/ast/tree/subscript.rs

python_ast/ast/tree/
subscript.rs
