python_ast/ast/tree/
async_with.rs

1use proc_macro2::TokenStream;
2use pyo3::{Bound, FromPyObject, PyAny, PyResult, prelude::PyAnyMethods};
3use quote::quote;
4use serde::{Deserialize, Serialize};
5
6use crate::{
7    CodeGen, CodeGenContext, ExprType, Node, PythonOptions, Statement, SymbolTableScopes,
8    extract_list,
9};
10
11/// Async with statement (async with context as var: ...)
12#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
13pub struct AsyncWith {
14    /// The with items (context managers)
15    pub items: Vec<WithItem>,
16    /// The body of the with statement
17    pub body: Vec<Statement>,
18    /// Position information
19    pub lineno: Option<usize>,
20    pub col_offset: Option<usize>,
21    pub end_lineno: Option<usize>,
22    pub end_col_offset: Option<usize>,
23}
24
25/// A with item (context_expr as optional_vars)
26#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
27pub struct WithItem {
28    /// The context expression (the thing being entered)
29    pub context_expr: ExprType,
30    /// Optional variable to bind the context to
31    pub optional_vars: Option<ExprType>,
32}
33
34impl<'a> FromPyObject<'a> for AsyncWith {
35    fn extract_bound(ob: &Bound<'a, PyAny>) -> PyResult<Self> {
36        // Extract items (list of withitem objects)
37        let items: Vec<WithItem> = extract_list(ob, "items", "async with items")?;
38        
39        // Extract body
40        let body: Vec<Statement> = extract_list(ob, "body", "async with body")?;
41        
42        Ok(AsyncWith {
43            items,
44            body,
45            lineno: ob.lineno(),
46            col_offset: ob.col_offset(),
47            end_lineno: ob.end_lineno(),
48            end_col_offset: ob.end_col_offset(),
49        })
50    }
51}
52
53impl<'a> FromPyObject<'a> for WithItem {
54    fn extract_bound(ob: &Bound<'a, PyAny>) -> PyResult<Self> {
55        // Extract context_expr
56        let context_expr: ExprType = ob.getattr("context_expr")?.extract()?;
57        
58        // Extract optional_vars (optional)
59        let optional_vars: Option<ExprType> = if let Ok(vars_attr) = ob.getattr("optional_vars") {
60            if vars_attr.is_none() {
61                None
62            } else {
63                Some(vars_attr.extract()?)
64            }
65        } else {
66            None
67        };
68        
69        Ok(WithItem {
70            context_expr,
71            optional_vars,
72        })
73    }
74}
75
76impl Node for AsyncWith {
77    fn lineno(&self) -> Option<usize> { self.lineno }
78    fn col_offset(&self) -> Option<usize> { self.col_offset }
79    fn end_lineno(&self) -> Option<usize> { self.end_lineno }
80    fn end_col_offset(&self) -> Option<usize> { self.end_col_offset }
81}
82
83impl CodeGen for AsyncWith {
84    type Context = CodeGenContext;
85    type Options = PythonOptions;
86    type SymbolTable = SymbolTableScopes;
87
88    fn find_symbols(self, symbols: Self::SymbolTable) -> Self::SymbolTable {
89        // Process items and body
90        let symbols = self.items.into_iter().fold(symbols, |acc, item| {
91            let acc = item.context_expr.find_symbols(acc);
92            if let Some(vars) = item.optional_vars {
93                vars.find_symbols(acc)
94            } else {
95                acc
96            }
97        });
98        self.body.into_iter().fold(symbols, |acc, stmt| stmt.find_symbols(acc))
99    }
100
101    fn to_rust(
102        self,
103        ctx: Self::Context,
104        options: Self::Options,
105        symbols: Self::SymbolTable,
106    ) -> Result<TokenStream, Box<dyn std::error::Error>> {
107        // Generate body
108        let body_tokens: Result<Vec<TokenStream>, Box<dyn std::error::Error>> = self.body.into_iter()
109            .map(|stmt| stmt.to_rust(ctx.clone(), options.clone(), symbols.clone()))
110            .collect();
111        let body_tokens = body_tokens?;
112
113        // For now, generate a simplified async block
114        // In practice, this would need proper async context management
115        Ok(quote! {
116            {
117                // Async with block - simplified translation
118                // Python's async with doesn't map directly to Rust patterns
119                #(#body_tokens)*
120            }
121        })
122    }
123}
124
125#[cfg(test)]
126mod tests {
127    // Tests would go here - currently commented out as they need full AST infrastructure
128    // create_parse_test!(test_simple_async_with, "async with context:\n    pass", "test.py");
129}
python_ast/ast/tree/async_with.rs

python_ast/ast/tree/
async_with.rs
