ryo_executor/engine/impls/
manual_map.rs

1//! V2 ASTRegApply implementation for ManualMapMutation
2//!
3//! Converts manual Option/Result mapping patterns to .map():
4//! - `match opt { Some(x) => Some(f(x)), None => None }` → `opt.map(|x| f(x))`
5
6use ryo_analysis::SymbolKind;
7use ryo_mutations::idiom::ManualMapMutation;
8use ryo_mutations::{Mutation, MutationResult};
9use ryo_source::pure::{PureImplItem, PureItem};
10
11use crate::engine::{ASTMutationContext, ASTRegApply};
12
13impl ASTRegApply for ManualMapMutation {
14    fn apply_to_registry(&self, ctx: &mut ASTMutationContext) -> MutationResult {
15        let mut total_changes = 0;
16
17        if let Some(target_id) = self.target_fn {
18            // Target function specified: direct lookup
19            if let Some(PureItem::Fn(f)) = ctx.ast_registry.get_mut(target_id) {
20                total_changes += self.transform_block(&mut f.body);
21            }
22        } else {
23            // No target: process all functions
24            let fn_ids: Vec<_> = ctx
25                .symbol_registry
26                .iter()
27                .filter(|(id, _)| {
28                    matches!(ctx.symbol_registry.kind(*id), Some(SymbolKind::Function))
29                })
30                .map(|(id, _)| id)
31                .collect();
32
33            for id in fn_ids {
34                if let Some(PureItem::Fn(f)) = ctx.ast_registry.get_mut(id) {
35                    total_changes += self.transform_block(&mut f.body);
36                }
37            }
38
39            // Process impl blocks (methods)
40            let impl_ids: Vec<_> = ctx
41                .symbol_registry
42                .iter()
43                .filter(|(id, _)| matches!(ctx.symbol_registry.kind(*id), Some(SymbolKind::Impl)))
44                .map(|(id, _)| id)
45                .collect();
46
47            for id in impl_ids {
48                if let Some(PureItem::Impl(imp)) = ctx.ast_registry.get_mut(id) {
49                    for impl_item in &mut imp.items {
50                        if let PureImplItem::Fn(f) = impl_item {
51                            total_changes += self.transform_block(&mut f.body);
52                        }
53                    }
54                }
55            }
56        }
57
58        MutationResult {
59            mutation_type: self.mutation_type().to_string(),
60            changes: total_changes,
61            description: if total_changes > 0 {
62                format!(
63                    "Converted {} manual map pattern(s) to .map()",
64                    total_changes
65                )
66            } else {
67                "No manual map patterns converted".to_string()
68            },
69        }
70    }
71}
72
73#[cfg(test)]
74mod tests {
75    use super::*;
76    use crate::engine::ASTMutationEngine;
77    use ryo_analysis::testing::ContextBuilder;
78
79    #[test]
80    fn test_v2_manual_map_no_changes() {
81        // This test verifies basic integration - manual_map requires specific AST patterns
82        let mut ctx = ContextBuilder::new()
83            .with_file(
84                "src/lib.rs",
85                r#"
86fn process(opt: Option<i32>) -> Option<i32> {
87    opt.map(|x| x + 1)
88}
89"#,
90            )
91            .build();
92
93        let mutation = ManualMapMutation::new();
94        let result = ASTMutationEngine::execute_ast_reg(&mutation, &mut ctx);
95
96        assert_eq!(result.result.changes, 0);
97    }
98}
ryo_executor/engine/impls/manual_map.rs

ryo_executor/engine/impls/
manual_map.rs
