/**
* Copyright (c) 2026 Ivan Iraci <ivan.iraci@professioneit.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
import type { CallHierarchyItem, CallHierarchyIncomingCall, CallHierarchyOutgoingCall } from 'vscode-languageserver-protocol';
import type { CallHierarchyInput } from '../schemas/tool-schemas.js';
import type {
CallHierarchyResponse,
CallHierarchyItemResult,
CallHierarchyIncomingCallResult,
CallHierarchyOutgoingCallResult,
} from '../types.js';
import { prepareFile, toPosition, getSymbolKindName } from './utils.js';
import { uriToPath } from '../utils/uri.js';
import { LSPError, LSPErrorCode } from '../types.js';
/**
* Convert CallHierarchyItem to our result format.
*/
function convertItem(item: CallHierarchyItem): CallHierarchyItemResult {
const result: CallHierarchyItemResult = {
name: item.name,
kind: getSymbolKindName(item.kind),
path: uriToPath(item.uri),
line: item.range.start.line + 1,
column: item.range.start.character + 1,
range: {
start: { line: item.range.start.line + 1, column: item.range.start.character + 1 },
end: { line: item.range.end.line + 1, column: item.range.end.character + 1 },
},
selection_range: {
start: { line: item.selectionRange.start.line + 1, column: item.selectionRange.start.character + 1 },
end: { line: item.selectionRange.end.line + 1, column: item.selectionRange.end.character + 1 },
},
};
if (item.detail) {
result.detail = item.detail;
}
if (item.tags && item.tags.length > 0) {
result.tags = item.tags.map(t => t === 1 ? 'deprecated' : `tag_${t}`);
}
return result;
}
/**
* Convert CallHierarchyIncomingCall to our result format.
*/
function convertIncomingCall(call: CallHierarchyIncomingCall): CallHierarchyIncomingCallResult {
return {
from: convertItem(call.from),
from_ranges: call.fromRanges.map(r => ({
start: { line: r.start.line + 1, column: r.start.character + 1 },
end: { line: r.end.line + 1, column: r.end.character + 1 },
})),
};
}
/**
* Convert CallHierarchyOutgoingCall to our result format.
*/
function convertOutgoingCall(call: CallHierarchyOutgoingCall): CallHierarchyOutgoingCallResult {
return {
to: convertItem(call.to),
from_ranges: call.fromRanges.map(r => ({
start: { line: r.start.line + 1, column: r.start.character + 1 },
end: { line: r.end.line + 1, column: r.end.character + 1 },
})),
};
}
/**
* Handle lsp_call_hierarchy tool call.
*/
export async function handleCallHierarchy(
input: CallHierarchyInput
): Promise<CallHierarchyResponse> {
const { file_path, line, column, direction } = input;
const { client, uri, content } = await prepareFile(file_path);
// Convert position
const position = toPosition(line, column, content);
// Prepare call hierarchy
const items = await client.prepareCallHierarchy(uri, position);
if (!items || items.length === 0) {
throw new LSPError(
LSPErrorCode.CAPABILITY_NOT_SUPPORTED,
'No call hierarchy item found at this position',
'Move cursor to a function, method, or callable symbol.',
{ file_path, position: { line, column } }
);
}
// Use the first item (usually there's only one)
const item = items[0]!;
const result: CallHierarchyResponse = {
item: convertItem(item),
};
// Get incoming calls if requested
if (direction === 'incoming' || direction === 'both') {
const incomingCalls = await client.callHierarchyIncomingCalls(item);
if (incomingCalls && incomingCalls.length > 0) {
result.incoming_calls = incomingCalls.map(convertIncomingCall);
}
}
// Get outgoing calls if requested
if (direction === 'outgoing' || direction === 'both') {
const outgoingCalls = await client.callHierarchyOutgoingCalls(item);
if (outgoingCalls && outgoingCalls.length > 0) {
result.outgoing_calls = outgoingCalls.map(convertOutgoingCall);
}
}
return result;
}
