debtmap/extraction_patterns/language_specific/
python_patterns.rs

1use crate::extraction_patterns::{
2    AccumulationOp, AnalysisContext, ComplexityImpact, ExtractablePattern, ExtractionSuggestion,
3    MatchedPattern, Parameter, PatternMatcher,
4};
5use syn::File;
6
7pub struct PythonPatternMatcher;
8
9impl Default for PythonPatternMatcher {
10    fn default() -> Self {
11        Self::new()
12    }
13}
14
15impl PythonPatternMatcher {
16    pub fn new() -> Self {
17        Self
18    }
19
20    #[allow(dead_code)]
21    fn detect_list_comprehensions(&self) -> Vec<ExtractablePattern> {
22        // Would analyze Python AST for list comprehensions that could be extracted
23        Vec::new()
24    }
25
26    #[allow(dead_code)]
27    fn detect_guard_patterns(&self) -> Vec<ExtractablePattern> {
28        // Would analyze Python AST for guard patterns
29        Vec::new()
30    }
31
32    #[allow(dead_code)]
33    fn detect_data_transformations(&self) -> Vec<ExtractablePattern> {
34        // Would analyze Python AST for data transformation patterns
35        Vec::new()
36    }
37}
38
39impl PatternMatcher for PythonPatternMatcher {
40    fn match_patterns(&self, _ast: &File, _context: &AnalysisContext) -> Vec<MatchedPattern> {
41        // Python pattern matching would use rustpython_parser
42        // For now, return empty vec as placeholder
43        Vec::new()
44    }
45
46    fn score_confidence(&self, pattern: &MatchedPattern, context: &AnalysisContext) -> f32 {
47        use crate::extraction_patterns::confidence::ConfidenceScorer;
48        ConfidenceScorer::score_pattern(pattern, context)
49    }
50
51    fn generate_extraction(&self, pattern: &MatchedPattern) -> ExtractionSuggestion {
52        use crate::extraction_patterns::naming::FunctionNameInferrer;
53
54        let suggested_name = FunctionNameInferrer::infer_name(&pattern.pattern, "python");
55
56        let (start_line, end_line) = match &pattern.pattern {
57            ExtractablePattern::AccumulationLoop {
58                start_line,
59                end_line,
60                ..
61            }
62            | ExtractablePattern::GuardChainSequence {
63                start_line,
64                end_line,
65                ..
66            }
67            | ExtractablePattern::TransformationPipeline {
68                start_line,
69                end_line,
70                ..
71            }
72            | ExtractablePattern::SimilarBranches {
73                start_line,
74                end_line,
75                ..
76            }
77            | ExtractablePattern::NestedExtraction {
78                start_line,
79                end_line,
80                ..
81            } => (*start_line, *end_line),
82        };
83
84        let parameters = self.extract_parameters(&pattern.pattern);
85        let return_type = self.infer_return_type(&pattern.pattern);
86        let complexity_reduction =
87            self.calculate_complexity_reduction(&pattern.pattern, &pattern.context);
88        let example = self.generate_example(&pattern.pattern, &suggested_name);
89
90        ExtractionSuggestion {
91            pattern_type: pattern.pattern.clone(),
92            start_line,
93            end_line,
94            suggested_name,
95            confidence: pattern.confidence,
96            parameters,
97            return_type,
98            complexity_reduction,
99            example_transformation: example,
100        }
101    }
102}
103
104impl PythonPatternMatcher {
105    fn extract_parameters(&self, pattern: &ExtractablePattern) -> Vec<Parameter> {
106        match pattern {
107            ExtractablePattern::AccumulationLoop {
108                iterator_binding, ..
109            } => {
110                vec![Parameter {
111                    name: format!("{}_list", iterator_binding),
112                    type_hint: "List[Any]".to_string(),
113                    is_mutable: false,
114                }]
115            }
116            ExtractablePattern::GuardChainSequence { .. } => {
117                vec![Parameter {
118                    name: "value".to_string(),
119                    type_hint: "Any".to_string(),
120                    is_mutable: false,
121                }]
122            }
123            ExtractablePattern::TransformationPipeline { input_binding, .. } => {
124                vec![Parameter {
125                    name: input_binding.clone(),
126                    type_hint: "Any".to_string(),
127                    is_mutable: false,
128                }]
129            }
130            _ => Vec::new(),
131        }
132    }
133
134    fn infer_return_type(&self, pattern: &ExtractablePattern) -> String {
135        match pattern {
136            ExtractablePattern::AccumulationLoop { operation, .. } => match operation {
137                AccumulationOp::Sum | AccumulationOp::Product => "float".to_string(),
138                AccumulationOp::Concatenation => "str".to_string(),
139                AccumulationOp::Collection => "List[Any]".to_string(),
140                AccumulationOp::Custom(_) => "Any".to_string(),
141            },
142            ExtractablePattern::GuardChainSequence { early_return, .. } => {
143                early_return.type_name.clone()
144            }
145            ExtractablePattern::TransformationPipeline { output_type, .. } => output_type.clone(),
146            _ => "None".to_string(),
147        }
148    }
149
150    fn calculate_complexity_reduction(
151        &self,
152        pattern: &ExtractablePattern,
153        context: &AnalysisContext,
154    ) -> ComplexityImpact {
155        let extracted_complexity = match pattern {
156            ExtractablePattern::AccumulationLoop {
157                filter, transform, ..
158            } => {
159                let base = 2;
160                let filter_complexity = if filter.is_some() { 1 } else { 0 };
161                let transform_complexity = if transform.is_some() { 1 } else { 0 };
162                base + filter_complexity + transform_complexity
163            }
164            ExtractablePattern::GuardChainSequence { checks, .. } => checks.len() as u32,
165            ExtractablePattern::TransformationPipeline { stages, .. } => stages.len() as u32 * 2,
166            _ => 3,
167        };
168
169        ComplexityImpact {
170            current_cyclomatic: context.complexity_before,
171            predicted_cyclomatic: context
172                .complexity_before
173                .saturating_sub(extracted_complexity),
174            current_cognitive: context.complexity_before * 2,
175            predicted_cognitive: (context.complexity_before * 2)
176                .saturating_sub(extracted_complexity * 2),
177            extracted_function_complexity: extracted_complexity,
178        }
179    }
180
181    fn generate_example(&self, pattern: &ExtractablePattern, function_name: &str) -> String {
182        match pattern {
183            ExtractablePattern::AccumulationLoop {
184                iterator_binding,
185                operation,
186                ..
187            } => {
188                let _op = match operation {
189                    AccumulationOp::Sum => "sum",
190                    AccumulationOp::Product => "product",
191                    _ => "accumulate",
192                };
193                format!(
194                    "# Before:\n\
195                     result = 0\n\
196                     for {} in items:\n\
197                         result += {}\n\n\
198                     # After:\n\
199                     result = {}(items)",
200                    iterator_binding, iterator_binding, function_name
201                )
202            }
203            ExtractablePattern::GuardChainSequence { .. } => {
204                format!(
205                    "# Before:\n\
206                     if not condition1:\n\
207                         raise ValueError('Invalid')\n\
208                     if not condition2:\n\
209                         raise ValueError('Invalid')\n\n\
210                     # After:\n\
211                     {}(value)",
212                    function_name
213                )
214            }
215            ExtractablePattern::TransformationPipeline { .. } => {
216                format!(
217                    "# Before:\n\
218                     data = [x * 2 for x in items]\n\
219                     data = [x for x in data if x > 10]\n\
220                     result = sorted(data)\n\n\
221                     # After:\n\
222                     result = {}(items)",
223                    function_name
224                )
225            }
226            _ => "# Example transformation".to_string(),
227        }
228    }
229}
debtmap/extraction_patterns/language_specific/python_patterns.rs

debtmap/extraction_patterns/language_specific/
python_patterns.rs
