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import fs from 'node:fs';
import path from 'node:path';
import * as ts from 'typescript';
import { IMPORT_RESOLVE_EXTS } from './types.js';
import type { NodeBudget, NodeTree, SyntaxNode } from './types.js';
export function canonicalScriptKind(ext: string): ts.ScriptKind {
switch (ext) {
case '.tsx':
return ts.ScriptKind.TSX;
case '.jsx':
return ts.ScriptKind.JSX;
case '.js':
case '.mjs':
case '.cjs':
return ts.ScriptKind.JS;
case '.ts':
default:
return ts.ScriptKind.TS;
}
}
export function hashString(value: string): string {
return crypto.createHash('sha1').update(value).digest('hex').slice(0, 16);
}
export function normalizeNodeKind(kind: ts.SyntaxKind): string {
switch (kind) {
case ts.SyntaxKind.Identifier:
return 'ID';
case ts.SyntaxKind.StringLiteral:
case ts.SyntaxKind.NoSubstitutionTemplateLiteral:
case ts.SyntaxKind.TemplateMiddle:
case ts.SyntaxKind.TemplateHead:
return 'STR';
case ts.SyntaxKind.NumericLiteral:
return 'NUM';
case ts.SyntaxKind.BigIntLiteral:
return 'BIGINT';
case ts.SyntaxKind.TrueKeyword:
case ts.SyntaxKind.FalseKeyword:
return 'BOOL';
case ts.SyntaxKind.NullKeyword:
return 'NULL';
default:
return ts.SyntaxKind[kind] || 'UNKNOWN';
}
}
export function makeFingerprint(node: ts.Node, seen: WeakMap<ts.Node, string> = new WeakMap()): string {
if (seen.has(node)) return seen.get(node)!;
const tokens: string[] = [];
const visit = (current: ts.Node): void => {
tokens.push(normalizeNodeKind(current.kind));
ts.forEachChild(current, visit);
};
visit(node);
const hash = hashString(tokens.join('|'));
seen.set(node, hash);
return hash;
}
export function makeTreeSitterFingerprint(node: SyntaxNode): string {
const tokens: string[] = [];
const visit = (current: SyntaxNode): void => {
tokens.push(current.type);
for (const child of current.children) visit(child);
};
visit(node);
return hashString(tokens.join('|'));
}
export function getLineAndCharacter(sourceFile: ts.SourceFile, node: ts.Node): { lineStart: number; lineEnd: number; columnStart: number; columnEnd: number } {
const start = sourceFile.getLineAndCharacterOfPosition(node.getStart(sourceFile));
const end = sourceFile.getLineAndCharacterOfPosition(node.getEnd());
return {
lineStart: start.line + 1,
lineEnd: end.line + 1,
columnStart: start.character + 1,
columnEnd: end.character + 1,
};
}
export function buildNodeTree(node: ts.Node, sourceFile: ts.SourceFile, depth: number, maxNodes: NodeBudget, seen: WeakSet<ts.Node> = new WeakSet()): NodeTree | null {
Iif (!node || maxNodes.size <= 0) return null;
maxNodes.size -= 1;
const loc = getLineAndCharacter(sourceFile, node);
const base: NodeTree = {
kind: ts.SyntaxKind[node.kind] || 'UNKNOWN',
startLine: loc.lineStart,
endLine: loc.lineEnd,
children: [],
};
if (depth <= 0) {
base.truncated = true;
return base;
}
if (seen.has(node)) {
base.truncated = true;
return base;
}
seen.add(node);
ts.forEachChild(node, (child) => {
if (maxNodes.size <= 0) return;
const childTree = buildNodeTree(child, sourceFile, depth - 1, maxNodes, seen);
if (childTree) {
base.children.push(childTree);
}
});
return base;
}
export function buildTreeSitterTree(node: SyntaxNode, _sourceFileText: string, depth: number, maxNodes: NodeBudget, seen: WeakSet<SyntaxNode> = new WeakSet()): NodeTree | null {
if (!node || maxNodes.size <= 0) return null;
maxNodes.size -= 1;
const base: NodeTree = {
kind: node.type,
startLine: node.startPosition.row + 1,
endLine: node.endPosition.row + 1,
children: [],
};
if (depth <= 0) {
base.truncated = true;
return base;
}
if (seen.has(node)) {
base.truncated = true;
return base;
}
seen.add(node);
for (const child of node.children) {
if (maxNodes.size <= 0) break;
const childTree = buildTreeSitterTree(child, _sourceFileText, depth - 1, maxNodes, seen);
if (childTree) {
base.children.push(childTree);
}
}
return base;
}
export function renderNodeText(node: NodeTree, indent: number = 0): string {
const pad = ' '.repeat(indent);
const span = node.startLine === node.endLine ? `${node.startLine}` : `${node.startLine}:${node.endLine}`;
const trunc = node.truncated ? ' ...' : '';
let line = `${pad}${node.kind}[${span}]${trunc}\n`;
for (const child of node.children) {
line += renderNodeText(child, indent + 1);
}
return line;
}
export function renderTreesText(entries: import('./types.js').TreeEntry[], generatedAt: string): string {
const lines: string[] = [`# AST Trees — ${generatedAt}`, ''];
for (const entry of entries) {
lines.push(`## ${entry.package} — ${entry.file}`);
lines.push(renderNodeText(entry.tree));
}
return lines.join('\n');
}
export function isTestFile(filePath: string): boolean {
return (
/(?:^|[\\/])(?:__tests__|__test__|tests)(?:[\\/]|$)/.test(filePath) ||
/(?:\.test|_test|\.spec)\.(?:ts|tsx|js|jsx|mjs|cjs)$/.test(filePath)
);
}
export function toRepoPath(filePath: string, root: string): string {
return path.relative(root, filePath).replace(/\\/g, '/');
}
export function normalizeDependencyValue(value: string): string {
return path.normalize(value).replace(/\\/g, '/');
}
export function addToMapSet(map: Map<string, Set<string>>, key: string, value: string): void {
if (!map.has(key)) {
map.set(key, new Set());
}
map.get(key)!.add(value);
}
export function isRelativeImport(specifier: string): boolean {
return specifier.startsWith('./') || specifier.startsWith('../') || specifier.startsWith('.\\') || specifier.startsWith('..\\');
}
export function resolveImportTarget(currentDirectory: string, specifier: string): string | null {
const cleaned = specifier.replace(/[?#].*$/, '');
const base = path.resolve(currentDirectory, cleaned);
const candidates: string[] = [];
const ext = path.extname(base);
const jsToTsMap: Record<string, string[]> = {
'.js': ['.ts', '.tsx'],
'.jsx': ['.tsx'],
'.mjs': ['.ts', '.tsx'],
'.cjs': ['.ts', '.tsx'],
};
if (ext) {
candidates.push(base);
const altExts = jsToTsMap[ext];
if (altExts) {
const noExt = base.slice(0, -ext.length);
for (const candidateExt of altExts) {
const withTsExt = `${noExt}${candidateExt}`;
candidates.push(withTsExt);
}
}
} else {
for (const ext of IMPORT_RESOLVE_EXTS) {
candidates.push(`${base}${ext}`);
}
for (const ext of IMPORT_RESOLVE_EXTS) {
candidates.push(path.join(base, `index${ext}`));
}
}
for (const candidate of candidates) {
if (fs.existsSync(candidate)) {
return candidate;
}
}
return null;
}
export function increment<T>(map: Map<string, T[]>, key: string, value: T): void {
if (!map.has(key)) map.set(key, []);
map.get(key)!.push(value);
}
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