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* Python Context Analyzer
*
* Analyzes Python code for:
* - Import chain depth
* - Context budget (tokens needed)
* - Module cohesion
* - Import fragmentation
*/
import { getParser, estimateTokens } from '@aiready/core';
import { resolve, relative, dirname, join } from 'path';
import fs from 'fs';
import {
calculateImportDepthFromEdges,
detectGraphCyclesFromFile,
} from '../utils/dependency-graph-utils';
export interface PythonContextMetrics {
file: string;
importDepth: number;
contextBudget: number; // Total tokens needed (file + dependencies)
cohesion: number; // 0-1, higher is better
imports: PythonImportInfo[];
exports: PythonExportInfo[];
metrics: {
linesOfCode: number;
importCount: number;
exportCount: number;
circularDependencies: string[];
};
}
export interface PythonImportInfo {
source: string;
specifiers: string[];
isRelative: boolean;
resolvedPath?: string;
}
export interface PythonExportInfo {
name: string;
type: string;
}
/**
* Analyze Python files for context metrics
*/
export async function analyzePythonContext(
files: string[],
rootDir: string
): Promise<PythonContextMetrics[]> {
const results: PythonContextMetrics[] = [];
const parser = await getParser('dummy.py');
if (!parser) {
console.warn('Python parser not available');
return results;
}
const pythonFiles = files.filter((f) => f.toLowerCase().endsWith('.py'));
// Some path helpers are imported for future use; reference them to avoid lint warnings
void relative;
void join;
// Build dependency graph first
const dependencyGraph = await buildPythonDependencyGraph(
pythonFiles,
rootDir
);
for (const file of pythonFiles) {
try {
const code = await fs.promises.readFile(file, 'utf-8');
const result = parser.parse(code, file);
const imports: PythonImportInfo[] = result.imports.map((imp) => ({
source: imp.source,
specifiers: imp.specifiers,
isRelative: imp.source.startsWith('.'),
resolvedPath: resolvePythonImport(file, imp.source, rootDir),
}));
const exports: PythonExportInfo[] = result.exports.map((exp) => ({
name: exp.name,
type: exp.type,
}));
// Calculate metrics
const linesOfCode = code.split('\n').length;
const importDepth = calculateImportDepthFromEdges(
file,
dependencyGraph,
new Set()
);
const contextBudget = estimateContextBudget(
code,
imports,
dependencyGraph
);
const cohesion = calculatePythonCohesion(exports, imports);
const circularDependencies = detectGraphCyclesFromFile(
file,
dependencyGraph
).map((cycle) => cycle.join(' -> '));
results.push({
file,
importDepth,
contextBudget,
cohesion,
imports,
exports,
metrics: {
linesOfCode,
importCount: imports.length,
exportCount: exports.length,
circularDependencies,
},
});
} catch (error) {
console.warn(`Failed to analyze ${file}:`, error);
}
}
return results;
}
/**
* Build dependency graph for Python files
*/
async function buildPythonDependencyGraph(
files: string[],
rootDir: string
): Promise<Map<string, Set<string>>> {
const graph = new Map<string, Set<string>>();
const parser = await getParser('dummy.py');
Iif (!parser) return graph;
for (const file of files) {
try {
const code = await fs.promises.readFile(file, 'utf-8');
const result = parser.parse(code, file);
const dependencies = new Set<string>();
for (const imp of result.imports) {
const resolved = resolvePythonImport(file, imp.source, rootDir);
Iif (resolved && files.includes(resolved)) {
dependencies.add(resolved);
}
}
graph.set(file, dependencies);
} catch (error) {
void error;
// Skip files with errors
}
}
return graph;
}
/**
* Resolve Python import to file path
*/
function resolvePythonImport(
fromFile: string,
importPath: string,
rootDir: string
): string | undefined {
const dir = dirname(fromFile);
// Handle relative imports
if (importPath.startsWith('.')) {
const parts = importPath.split('.');
let upCount = 0;
while (parts[0] === '') {
upCount++;
parts.shift();
}
let targetDir = dir;
for (let i = 0; i < upCount - 1; i++) {
targetDir = dirname(targetDir);
}
const modulePath = parts.join('/');
const possiblePaths = [
resolve(targetDir, `${modulePath}.py`),
resolve(targetDir, modulePath, '__init__.py'),
];
for (const path of possiblePaths) {
Iif (fs.existsSync(path)) {
return path;
}
}
} else {
// Handle absolute imports (from project root)
const modulePath = importPath.replace(/\./g, '/');
const possiblePaths = [
resolve(rootDir, `${modulePath}.py`),
resolve(rootDir, modulePath, '__init__.py'),
];
for (const path of possiblePaths) {
Iif (fs.existsSync(path)) {
return path;
}
}
}
return undefined;
}
/**
* Estimate context budget (tokens needed for file + direct deps)
*/
function estimateContextBudget(
code: string,
imports: PythonImportInfo[],
dependencyGraph: Map<string, Set<string>>
): number {
// File tokens
void dependencyGraph;
let budget = estimateTokens(code);
// Add tokens for direct dependencies (simplified)
// In a full implementation, we'd load each dependency file
const avgTokensPerDep = 500; // Conservative estimate
budget += imports.length * avgTokensPerDep;
return budget;
}
/**
* Calculate cohesion for a Python module
*
* Cohesion = How related are the exports to each other?
* Higher cohesion = better (single responsibility)
*/
function calculatePythonCohesion(
exports: PythonExportInfo[],
imports: PythonImportInfo[]
): number {
Eif (exports.length === 0) return 1;
// Simple heuristic: files with many exports but few imports are less cohesive
const exportCount = exports.length;
const importCount = imports.length;
// Ideal: 1-5 exports per module
let cohesion = 1;
if (exportCount > 10) {
cohesion *= 0.6; // Too many exports = God module
} else if (exportCount > 5) {
cohesion *= 0.8;
}
// High import-to-export ratio suggests focused module
if (exportCount > 0) {
const ratio = importCount / exportCount;
if (ratio > 2) {
cohesion *= 1.1; // Good: imports more than it exports
} else if (ratio < 0.5) {
cohesion *= 0.9; // Bad: exports more than it imports
}
}
return Math.min(1, Math.max(0, cohesion));
}
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