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Fix signatureHelp signature selection heuristic

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This commit is contained in:
Fangrui Song 2018-01-20 16:17:28 -08:00
parent c36eda70f9
commit 8c6a87b3a3
1 changed files with 12 additions and 6 deletions
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18
src/messages/text_document_signature_help.cc
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@ -4,6 +4,8 @@
#include "queue_manager.h" #include "queue_manager.h"
#include "timer.h" #include "timer.h"
#include <stdint.h>
namespace { namespace {
struct Ipc_TextDocumentSignatureHelp struct Ipc_TextDocumentSignatureHelp
: public RequestMessage<Ipc_TextDocumentSignatureHelp> { : public RequestMessage<Ipc_TextDocumentSignatureHelp> {
@ -122,13 +124,17 @@ struct TextDocumentSignatureHelpHandler : MessageHandler {
out.result.signatures.push_back(signature); out.result.signatures.push_back(signature);
} }
// Guess the signature the user wants based on available parameter // Prefer the signature with least parameter count but still larger
// count. // than active_param.
out.result.activeSignature = 0; out.result.activeSignature = 0;
for (size_t i = 0; i < out.result.signatures.size(); ++i) { if (out.result.signatures.size()) {
if (active_param < out.result.signatures.size()) { size_t num_parameters = SIZE_MAX;
out.result.activeSignature = (int)i; for (size_t i = 0; i < out.result.signatures.size(); ++i) {
break; size_t t = out.result.signatures[i].parameters.size();
if (active_param < t && t < num_parameters) {
out.result.activeSignature = int(i);
num_parameters = t;
}
} }
} }